Immunohistochemical Staining (immunohistochemical + staining)

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Terms modified by Immunohistochemical Staining

  • immunohistochemical staining pattern

  • Selected Abstracts


    Mineralocorticoid Receptor Is Overexpressed in Cardiomyocytes of Patients With Congestive Heart Failure

    CONGESTIVE HEART FAILURE, Issue 1 2005
    Masahiro Yoshida MD
    Mineralocorticoid receptors (MRs) have been identified in the human cardiovascular tissues. We determined MR expression in the failing heart to clarify the mechanism of action of aldosterone antagonist in the treatment of congestive heart failure. MR protein and MR mRNA content were detected by immunohistochemical staining and in situ hybridization in the cardiac tissues. Immunohistochemical staining of the receptor, as well as in situ hybridization of MR mRNA, was dense in cardiomyocytes of the failing left ventricle as compared with the controls. The staining ratio of the cytoplasm to the interstitium showed that MRs were located mainly in the cytoplasm. The cytoplasm to the interstitium in the failing left ventricle was 1.530.13, which was significantly higher than that of the controls 1.250.19 (p<0.05). These findings suggest that the efficacy of aldosterone antagonists in treating congestive heart failure may be in part through blocking the MRs, which are upregulated in the failing heart. [source]


    Original article: The expression of CFL1 and N-WASP in esophageal squamous cell carcinoma and its correlation with clinicopathological features

    DISEASES OF THE ESOPHAGUS, Issue 6 2010
    Wei-Sen Wang
    SUMMARY Cofilin1 (CFL1) is an actin-modulating protein, which belongs to the ADF/Cofilin family. Neural Wiskott,Aldrich syndrome protein (N-WASP) is the key regulator of the actin cytoskeleton, a member of Wiskott-Aldrich syndrome protein family. They have been suggested to be involved in cancer cell invasion and metastasis. In this study, the expression patterns of CFL1 and N-WASP in normal esophageal mucosa and esophageal squamous cell carcinoma (ESCC) and their correlation with clinical characteristics were investigated. Immunohistochemical staining showed that CFL1 was expressed in nuclear and cytoplasm of cancer cells. However, N-WASP was mainly found in the cytoplasm of the cancer cells. There were significant evidences that proved that CFL1 is correlated with clinicopathological factors in ESCC, such as infiltration depth, lymph node metastasis and pathological staging (P < 0.05). It is also proved that N-WASP is related to lymph node metastasis and pathological staging in ESCC (P < 0.05). Kaplan,Meier analysis showed that there was no correlation between CFL1 and N-WASP protein expression and survival (P > 0.05). Moreover, the mRNA expression of CFL1 and N-WASP was detected by quantitative real time PCR in 70 tissue specimens. The results showed that CFL1 mRNA level was over-expressed in ESCC tissue (P < 0.05), while N-WASP mRNA expression level was not different between cancerous tissues and adjacent normal esophageal mucosa (P > 0.05). Also, CFL1 mRNA expression was significantly associated with regional lymph node metastasis and pathological staging (P < 0.05). Kaplan,Meier analysis showed that there was no correlation between CFL1 and N-WASP mRNA expression and survival (P > 0.05). Our findings suggested that CFL1 and N-WASP may play an important role in the tumorigenesis of ESCC, and to be the candidate novel biomarkers for the diagnosis and prognosis of ESCC. These findings may have implications for targeted therapies in patients with ESCC. [source]


    Mutation in hotfoot-4J mice results in retention of ,2 glutamate receptors in ER

    EUROPEAN JOURNAL OF NEUROSCIENCE, Issue 8 2002
    Shinji Matsuda
    Abstract The orphan glutamate receptor ,2 is selectively expressed in Purkinje cells and plays a critical role in cerebellar function. Recently, the ataxia of hotfoot-4J (ho-4J) mice was shown to be caused by a 170,amino acid deletion in the N-terminal region of ,2 receptors. To understand ,2 receptor function, we characterized these mutant receptors (,2ho) in Purkinje cells. Immunohistochemical staining showed that ,2ho receptors of the ho-4J homozygotes were abundantly expressed but localized to the Purkinje cell soma; in wild-type mice, ,2 receptors were predominantly present at distal dendrites of Purkinje cells. In addition, ,2ho receptors of the ho-4J mice were sensitive to endoglycosidase H, a finding suggesting that ,2ho receptors were not transported beyond the endoplasmic reticulum (ER) or cis -Golgi apparatus. To gain further insights into the mechanisms of this phenomenon, we characterized ,2ho receptors in transfected HEK293 cells. ,2ho receptors expressed in HEK293 cells were also sensitive to endoglycosidase H. Immunohistochemical staining showed that ,2ho receptors colocalized with proteins retained in the ER. Furthermore, ,2ho receptors were not labelled by membrane-impermeable biotinylation reagents. Coimmunoprecipitation assays showed that the intermolecular interaction of ,2ho receptors was significantly weaker than those of wild-type ,2 receptors, a finding suggesting that the ho-4J region is involved in oligomerization of ,2 receptors. Thus, ,2ho receptors were retained in the ER, probably by the quality control mechanism that detects unstable oligomers. We conclude that the absence of ,2 receptors on the cell surface by failed transport from the ER of Purkinje cells causes ataxia. [source]


    Expression of cathepsins B, D and L in mouse corneas infected with Pseudomonas aeruginosa

    FEBS JOURNAL, Issue 24 2001
    Zhong Dong
    C57BL/6J nave and immunized mice were intracorneally infected with Pseudomonas aeruginosa. Semi-quantitative RT-PCR was performed to detect cathepsin gene expression and the results were further confirmed by immunoblot analysis. The enzymatic activities of cathepsins B, D and L were measured by peptidase assays. Immunohistochemical staining was carried out to localize the expression of the cathepsins. Cathepsins B, D and L were detected in the normal cornea by RT-PCR. A peptidase assay revealed activities of all three cathepsins under normal physiological conditions. In nave mice, enzymatic activities of cathepsins B, D and L were all significantly enhanced when the corneas were infected with P. aeruginosa and the peak of the induction appeared around day 6 postinfection. Immunoblot analysis showed increased expression of cathepsins B, D and L. The infected corneal samples from immunized mice exhibited much lower induction of enzymatic activities compared to those from nave mice. Immunohistochemistry showed that the expression of cathepsins in the normal cornea was restricted to the epithelial tissue while the induced expression of cathepsins was predominantly in the substantia propria. Our data revealed up-regulated enzymatic activities of cathepsins B, D and L in the nave corneas infected with P. aeruginosa, which correlated well with the inflammatory response. Immunization of mice against P. aeruginosa attenuated the inducing effect on cathepsin expression caused by infection. The time sequence for induction of cathepsin proteins and enzymatic activities suggests a mechanism of host proteolytic degradation of the extracellular matrix resulting in corneal destruction after P. aeruginosa infection. [source]


    Densely methylated MLH1 promoter correlates with decreased mRNA expression in sporadic colorectal cancers

    GENES, CHROMOSOMES AND CANCER, Issue 1 2002
    Taiji Furukawa
    It has been reported that MLH1 is silenced by promoter methylation, and that this phenomenon is associated with microsatellite instability (MSI) in sporadic colorectal cancer (CRC). To clarify the significance of MLH1 promoter methylation in sporadic CRC, we examined the correlation between methylation status over the entire promoter region and mRNA expression in cases showing high-frequency MSI (MSI-H). MLH1 promoter methylation was analyzed using the bisulfite modification sequencing in 48 MSI-H cases. We also screened for somatic mutation, loss of heterozygosity, and immunohistochemical staining of MLH1. The results showed that methylation patterns could be subdivided into three types: methylation of more than 80% of the CpG sites analyzed (type 1 methylation), methylation of less than 20% (type 2 methylation), and methylation mainly in the region 500 to 921 bases upstream from the translation start site (type 3 methylation). Of the three types, only type 1 methylation correlated with decreased mRNA expression. The frequency of type 1 methylation was significantly higher in cases involving the proximal colon (66.7%, 18/27) compared to that of the distal colon and rectum (23.8%, 5/21, P = 0.004). Immunohistochemical staining of MSI-H cases showed that decreased MLH1 was found in 77.1% (37/48). Of the cases with decreased MLH1, type 1 methylation was present in 59.5% (22/37). Overall, our data suggested that the type 1 methylation pattern may affect MLH1 mRNA expression, such that the majority of MSI-H cases in sporadic CRC, especially proximal colon cancer, exhibited type 1 methylation. 2002 Wiley-Liss, Inc. [source]


    Hyaluronan and its receptors in mucoepidermoid carcinoma

    HEAD & NECK: JOURNAL FOR THE SCIENCES & SPECIALTIES OF THE HEAD AND NECK, Issue 2 2006
    Richard O. Wein MD
    Abstract Background. Hyaluronan (HA) is a prominent extracellular matrix component undergoing continuous production and degradation. Increased HA levels have been described in a variety of tumors. The objective of this study was to examine the staining patterns of HA and two of its associated receptors (CD44 and HARE) in relation to the metastatic potential of mucoepidermoid carcinoma (MC). Immunohistochemical staining of preserved surgical specimens was used. Methods. Tissues from 12 patients with a histologic diagnosis of salivary MC (10 parotid, one submandibular gland, one minor salivary gland) were studied. Half (six of 12) of the patients had regional metastases. Tumor, normal salivary tissue, and regional lymph nodes were stained for HA, CD44, and HARE expression. Specimens were graded for staining intensity and a percent of the specimen stained. Results. Normal salivary tissue did not demonstrate epithelial cell surface HA expression, whereas HA was expressed on tumor cells and in regional lymph nodes containing metastases. These differences were both significant using Student's t test (p < .00002, and p < .0022, respectively). Tumors with positive nodes tended to have greater cell surface HA. Decreased expression or downregulation of HARE was also noted in involved lymph nodes. No differences in CD44 expression were seen between primary specimens and lymph nodes. The observed staining patterns for CD44 and HARE were not reflective of the metastatic potential of the primary MC. Conclusions. Increased HA expression was seen on mucoepidermoid carcinoma cells compared with adjacent normal salivary gland epithelium. This observation may assist in explaining the development of regional metastasis in these tumors. We did not identify specific HA, CD44, or HARE staining patterns in primary lesions that were predictive of regional metastases. 2005 Wiley Periodicals, Inc. Head Neck27: XXX,XXX, 2005 [source]


    Presence of nanobacteria in psammoma bodies of ovarian cancer: evidence for pathogenetic role in intratumoral biomineralization

    HISTOPATHOLOGY, Issue 6 2004
    G Hudelist
    Aims:, The presence of laminated, calcified extracellular debris known as psammoma bodies is a well-known histomorphological feature of ovarian adenocarcinomas and other human malignancies. Biomineralization has recently been found to be associated with a group of extremely small Gram-negative bacteria capable of precipitating calcium salts. The aim of the present study was to evaluate a possible pathogenic link between the development of psammoma bodies and nanobacteria infection. Material and results:, Immunohistochemical staining and reverse transcriptase-polymerase chain reaction (RT-PCR) were used to analyse nanobacterial protein and gene expression in eight psammona body-containing adenocarcinomas and in 10 malignant ovarian tumours without signs of biomineralization. Nanobacterial proteins were detected in eight out of eight (100%) psammoma-positive tumour samples. Conversely, none of the 10 psammoma-negative tissues (0%) was positive for nanobacterial antigens. Furthermore, nanobacterial mRNA was detectable in all of the four tissues (100%) that contained psammoma bodies, but was absent in all 10 ovarian cystadenocarcinomas (0%) that were psammoma negative. Conclusions:, We found a 100% concordance between the expression of nanobacteria and the presence of psammoma bodies in malignant ovarian tumours. Several lines of evidence suggest the involvement of these organisms in the process of biomineralization. We therefore conclude that nanobacterial infection of malignant ovarian tissue contributes to mechanisms leading to the formation of calcified deposits known as psammoma bodies. [source]


    Intra-abdominal sequestration of the lung and elevated serum levels of CA 19-9: a diagnostic pitfall

    HPB, Issue 1 2004
    C Armbruster
    Background Extralobar pulmonary sequestration is an uncommon congenital abnormality that is rarely diagnosed after the age of 40 years. We describe a 64-year-old woman with an intra-abdominal sequestration of the lung and elevated carbohydrate antigen (CA) 19-9 serum levels. Case outline On abdominal ultrasound a semi-solid cystic tumour was demonstrated that showed tight connection to the tail of the pancreas according to computed tomography. Cytological examination of the percutaneous biopsy did not lead to a definitive diagnosis. CA 19-9 serum levels were repeatedly elevated >250 IU/ml. With a tentative diagnosis of a tumour of the tail of pancreas the semi-solid cystic mass was resected. Frozen section histology suggested the diagnosis of pulmonary sequestration, which was confirmed by definitive histological examination. Immunohistochemical staining of the specimen with a specific monoclonal antibody against CA 19-9 showed strong immunoreactivity. Three months later the elevated CA 19-9 serum levels returned to normal. Discussion Elevated CA 19-9 serum levels have been described in benign pulmonary and mediastinal cystic lesions and in one case of extralobar intrathoracic lung sequestration. Although there is evidence that malignancies may arise in congenital lung cysts, CA 19-9 serum levels have not been investigated in such cases. Based on our results elevated serum values of CA 19-9 in combination with a cystic semi-solid mass in the left subphrenic space should include the differential diagnosis of extralobar pulmonary sequestration. [source]


    Interleukin-10 expression significantly correlates with minor CD8+ T-cell infiltration and high microvessel density in patients with gastric cancer

    INTERNATIONAL JOURNAL OF CANCER, Issue 8 2006
    Teruhisa Sakamoto
    Abstract We aimed to investigate the relationships between interleukin-10 (IL-10) expression and both the clinicopathological findings and prognoses in patients with gastric cancer and to compare IL-10 expression with microvessel (MV) density and CD8+ T lymphocyte infiltration to evaluate its effects on angiogenesis and immune responses in gastric cancer. IL-10 expression was determined in gastric cancer patients by reverse transcription-polymerase chain reaction (RT-PCR) or immunohistochemical procedures. Two of 7 normal gastric tissues showed IL-10 mRNA expression, while its expressions were confirmed in all advanced gastric carcinoma tissues examined (n = 11) by RT-PCR. Immunohistochemical staining demonstrated that IL-10 expression was detected in 52 (47.7%) of 109 cases. There was a close correlation between IL-10 expression and MV density. IL-10 expression inversely correlated with CD8+ T-lymphocyte infiltration. The prognoses of patients whose tumors expressed IL-10 were significantly worse than those of patients whose tumors did not express IL-10. Multivariate analysis indicated IL-10 expression was an independent prognostic factor. IL-10 might be associated with tumor progression by stimulating angiogenesis and suppressing immune responses in gastric cancer. 2005 Wiley-Liss, Inc. [source]


    Erythema multiforme-like lesions associated with lesional infiltration of tumor cells occurring with adult T-cell lymphoma/leukemia

    INTERNATIONAL JOURNAL OF DERMATOLOGY, Issue 4 2008
    Tomoyuki Ohtani MD
    A 66-year-old Japanese woman visited our hospital with a complaint of multiple papules on her trunk and extremities. She had a past medical history of appendicitis and blood transfusion 40 years earlier. For the last 10 years, she had noticed multiple, gradually enlarging papulonodular lesions with surrounding erythema on her trunk and extremities. ,Physical examination revealed multiple, violaceous papules or nodules, less than 10 mm in diameter, with surrounding erythema on her trunk and extremities (Fig. 1). The results of routine laboratory examinations, including blood count, liver function, renal function, serum calcium, and lactate dehydrogenase, were within the normal range. The peripheral blood picture showed a small population of atypical lymphocytes below 1% of the total white blood cells. Human T-cell lymphotropic virus type I (HTLV-I) serology was positive. A microscopic examination of a biopsy specimen from a nodule on the abdomen demonstrated diffuse infiltration of large pleomorphic T cells in the upper and middle dermis, although highly atypical lymphocytes, so-called flower cells, could not be recognized. Infiltrating lymphocytes were positive for CD2, CD3, CD4, CD5, CD7, and CD45, but negative for CD8 and CD20, immunohistologically. Bone marrow biopsy also demonstrated the infiltration of lymphocytes expressing CD2, CD3, CD4, CD5, and CD7, but not CD25. Southern blot analysis of the infiltrating cells in the skin revealed an integration of HTLV-I proviral DNA in T cells. Clonal T-cell receptor , gene rearrangement was detected in skin and bone marrow biopsies. No abnormal mass or bone defect was detected by chest or abdominal computed tomographic scanning, systemic gallium-67 citrate scintigraphy, or chest radiography. On the basis of these data, the patient was diagnosed with smouldering-type adult T-cell lymphoma/leukemia. Figure 1. Clinical features of adult T-cell lymphoma/leukemia (ATL) skin lesions. Crusted, target-like, dark-red plaques on the lower legs ,The patient was started on topical steroid and electron beam radiation therapy (27 Gy/14 days). Five days after the start of irradiation, she noticed multiple patches of edematous erythema appearing on the trunk and extremities (Fig. 2). As it was initially suspected that these newly emerging erythema multiforme or toxic eruptions were caused by irradiation, therapy was interrupted. Anti-herpes simplex virus antibody was not checked because no typical herpes simplex lesions were noticed. The patient was not taking any systemic drugs. A skin biopsy was taken from a representative lesion on the chest. The pathologic specimen showed epidermotropism, liquefaction degeneration in the basal layer, marked edema, and dense infiltration of mononuclear cells in the upper dermis. Infiltrating cells possessed abundant cytoplasm and large pleomorphic nuclei with distinct nucleoli (Fig. 3). These findings were consistent with the histopathologic findings of erythema multiforme, except for the atypical lymphoid cell infiltration. Immunohistochemical staining demonstrated that the phenotype of the skin-infiltrating cells was identical to that of the atypical cells in the initial lesions. As the eruptions did not disappear in spite of the interruption of radiation, total skin irradiation was restarted. After completion of therapy, both the erythema multiforme-like lesions and the initial adult T-cell lymphoma/leukemia nodules on the trunk and extremities had resolved, leaving brown pigmentation. The patient has been free of any recurrence of skin lesions or systemic symptoms for 6 years after the completion of total skin irradiation. Figure 2. Appearance of erythema multiforme (EM)-like lesions. Edematous red plaques involving the breast Figure 3. Microscopic examination of a biopsy specimen from (EM)-like lesions on the chest (hematoxylin and eosin staining). (a) Epidermotropism, liquefaction degeneration in the basal layer, and dense infiltration of mononuclear cells and severe edema in the upper dermis (100). (b) High-power magnification revealed that the dermal infiltration included atypical lymphoid cells with abundant cytoplasm, convoluted large nuclei, and distinct nucleoli (400) [source]


    S-100-negative atypical granular cell tumor: report of a case

    INTERNATIONAL JOURNAL OF DERMATOLOGY, Issue 3 2002
    Mi-Woo Lee MD
    A 38-year-old man presented with a solitary, round, 1.2 1.2 cm, bluish-colored, dome-shaped, hard nodule on the left side of the neck, which had grown over 2 months (Fig. 1). The nodule was nontender and nonmovable. Light microscopy revealed that the neoplasm was situated in the reticular dermis with extension into the papillary dermis. The tumor showed expansile growth with smooth and round borders, and was made up of sheets of cells arranged in nests or lobules separated by thin delicate connective tissue septa. The tumor cells were round, oval, or polygonal in shape with distinct cellular borders. The cells had abundant eosinophilic granular cytoplasm, and considerable variation of cellular and nuclear size was noted (Fig. 2a). The tumor cell nuclei were vesicular and some had pleomorphism (Fig. 2b). Sometimes multiple nucleoli were seen. Mitoses and necrosis were virtually absent. Immunohistochemical staining revealed that some of the cytoplasmic granules stained positively with periodic acid,Schiff (PAS) after diastase treatment. Tumor cells showed strong reactivity for CD68 and neuron-specific enolase, and negative results for S-100, factor XIIIa, cytokeratin, desmin, CD34, and smooth muscle actin. Electron microscopy revealed that the tumor was composed of polygonal cells with round to irregular nuclei, and the cytoplasm contained numerous secondary lysosomes. The tumor was completely excised. Figure 1. A solitary, round, 1.2 1.2 cm, bluish-colored, dome-shaped, hard nodule on the left side of the neck Figure 2. (a) Tumor cells contain granular cytoplasm and show atypical cytologic features (b) Neoplastic cells show variation of cell size and nuclear pleomorphism [source]


    Vascular endothelial growth factor (VEGF), VEGF receptors expression and microvascular density in benign and malignant thyroid diseases

    INTERNATIONAL JOURNAL OF EXPERIMENTAL PATHOLOGY, Issue 4 2007
    Ala'eddin Jebreel
    Summary Angiogenesis is critical for the growth and metastatic spread of tumours. Vascular endothelial growth factor (VEGF) is the most potent inducer of neovasculature, and its increased expression has been related to a worse clinical outcome in many diseases. The purpose of this study was to evaluate the relation between VEGF, its receptors (VEGFR-1 and VEGFR-2) and microvessel density (MVD) in thyroid diseases. Immunostaining for VEGF and VEGF receptors was performed in 66 specimens of thyroid tissue, comprising 17 multinodular goitre (MNG), 14 Graves' disease, 10 follicular adenoma, 8 Hashimoto's thyroiditis, 7 papillary carcinoma and 10 normal thyroid specimens. Thyrocyte positivity for VEGF and VEGF receptors was scored 0,3. Immunohistochemistry for CD31, and CD34 on the same sections was performed to evaluate MVD. Immunohistochemical staining of VEGF in thyrocytes was positive in 92% of all the thyroid tissues studied. Using an immunostaining intensity cut off of 2, increased thyrocyte staining was seen in follicular adenoma specimens, MNG and normal thyroids compared with Hashimoto's thyroiditis and Graves' disease (P < 0.05). Similarly, VEGF thyrocyte expression in Graves' disease was less than other pathologies (P < 0.05). VEGFR-1 expression and the average MVD score did not differ between the different thyroid pathologies. VEGF expression was lower in autoimmune pathologies compared to autonomous growth processes. Conversely, both VEGFR-1 and VEGFR-2 were widely expressed in benign and neoplastic thyroid disease, suggesting that the up-regulation of VEGF and not its receptors occurs as tissue becomes autonomous. There was no clear relationship between MVD measurement and thyroid pathology. [source]


    Electroporation-mediated muscarinic M3 receptor gene transfer into rat urinary bladder

    INTERNATIONAL JOURNAL OF UROLOGY, Issue 11 2004
    MASAYUKI OTANI
    Abstract Background: Muscarinic M3 (M3) receptor has been recognized as a major muscarinic receptor for smooth muscle contractions of the urinary bladder. Under the hypothesis that overexpression of M3 receptor in the urinary bladder would enhance urinary bladder contractions, we have transferred the M3 receptor gene into rat bladders using electroporation (EP) and evaluated the functional expression of the transferred gene. Methods: Plasmids expressing luciferase, a green fluorescence protein and M3 receptor were injected into the rat bladder and square-wave electric pulses were immediately applied. Two days after gene transfer, we analyzed gene expression. Immunohistochemical staining was performed and the contractile responses from isolated bladder strips, which were induced KCl, carbachol and electrical field stimulation (EFS), were evaluated. Results: The optimal conditions of electroporation were 8 pulses, 45 voltages, 50 milliseconds/pulses and 1 Hz. Under these conditions, luciferase gene expression was enhanced approximately 300-fold, compared to an injection of DNA only. Regarding immunohistochemistry with an anti-M3 receptor, an increase in immunoactivity was observed in the M3 receptor gene transferred rat bladder, compared to the bladder of the control rat. In rats with the transferred M3 receptor gene, carbachol- and EFS-induced maximum contractile responses of bladder smooth muscle strips significantly increased. Conclusions: These findings suggest that an in vivo EP procedure is an useful method for gene transfer into the bladder and that an overexpression of M3 receptor in the rat bladder enhances bladder contractility. This technique may become a new treatment modality for detrusor underactivity. [source]


    Erythropoietin-producing renal cell carcinoma in chronic hemodialysis patients: A report of two cases

    INTERNATIONAL JOURNAL OF UROLOGY, Issue 1 2003
    SHINICHI SAKAMOTO
    Abstract Erythropoietin (EPO)-producing renal cell carcinomas in two hemodialysis patients are reported. Despite deteriorated kidney function, these patients did not manifest anemia at diagnosis and their elevated serum EPO levels rapidly returned to within the normal range after nephrectomy. Immunohistochemical staining of the resected specimens showed production of erythropoietin in the tumor cells in one case and in the lining cells of the cyst wall in the other case. Renal cell carcinoma could cause an increase of blood hematocrit level in dialysis patients. [source]


    Necrobiotic xanthogranuloma with paraproteinemia; an atypical case

    JOURNAL DER DEUTSCHEN DERMATOLOGISCHEN GESELLSCHAFT, Issue 1 2008
    Yoshiyuki Ito
    Summary Necrobiotic xanthogranuloma (NXG) is a rare marker for paraproteinemia. An 86-year-old woman had a one year history of large red-yellow to brown annular plaques involving all limbs. Biopsies showed a non-palisading granuloma with numerous multinucleated giant cells showing prominent elastophagocytosis and extensive areas of necrobiosis throughout the entire dermis. Complete loss of elastic fibers was observed in the central atrophic area of an annular plaque. Small vascular thromboses were also present. Laboratory findings revealed paraproteinemia of IgG-lambda type. Immunohistochemical staining detected the presence of roughly equal numbers of IgG-lambda-and IgG-kappa-staining plasma cells in the dermis. We diagnosed NXG with paraproteinemia with monoclonal gammopathy (IgG-lambda type) of unknown significance. [source]


    Osteopontin promotes gastric cancer metastasis by augmenting cell survival and invasion through Akt-mediated HIF-1, up-regulation and MMP9 activation

    JOURNAL OF CELLULAR AND MOLECULAR MEDICINE, Issue 8b 2009
    Gang Song
    Abstract Osteopontin (OPN) is a secreted, integrin-binding matrix phosphorylated glycoprotein. OPN has been shown to facilitate the progression and metastasis of malignancies and has prognostic value in several types of cancer, including gastric cancer. However, the functional mechanism of OPN mediated metastatic growth in gastric cancer remains unclear. Here, using multiple in vitro and in vivo models, we report that OPN strongly promoted the progression and metastasis of gastric cancer. Immunohistochemical staining revealed that OPN, matrix metalloproteinase (MMP)9 and hypoxia-inducible factor (HIF)-1, have statistically significant different expression patterns between well- and poorly differentiated tissue samples (P < 0.05). Correlations existed between OPN and MMP9, and between OPN and HIF-1, (r1= 0.872, p1 < 0.01 and r2= 0.878, p2 < 0.01). Furthermore, OPN dramatically increased colony formation and invasion of gastric cancer cells in vitro and promoted tumour growth and metastasis in vivo. In addition, OPN potently protected gastric cancer cells from serum depletion-induced apoptosis. Further study shows that OPN activated phosphoinositide 3-kinase/Akt survival pathway and up-regulated HIF-1,via binding to ,v,3 integrins in gastric cancer cells. Moreover, we found that OPN could activate MMP9 and up-regulate MMP2. Taken together, our results suggest that the survival-promoting function is crucial for OPN to promote the development of gastric cancer, and HIF-1, and MMP9 may play key roles during this process. Thus, targeting OPN and its related signalling network may develop an effective therapeutic approach for the management of gastric cancer. [source]


    Extramammary Paget's disease mimicking acantholytic squamous cell carcinoma in situ: a case report

    JOURNAL OF CUTANEOUS PATHOLOGY, Issue 6 2010
    Xufeng Du
    Background: Extramammary Paget's disease (EMPD) is an uncommon skin neoplasm characterized by Paget's cells with pale-staining cytoplasm in the epidermis, and cases with distinguished acantholysis but lacking characteristic Paget's cells were rarely reported in the literature. Methods: An 80-year-old male with lesion on scrotum was screened histologically and immunohistologically for the diagnosis of his tumor. Results: Histological examination showed acanthosis with cellular atypia and focal acantholysis, consistent with acantholytic squamous cell carcinoma in situ (SCCIS). No characteristic Paget's cells were observed in low magnification. Immunohistochemical staining showed carcinoembryonic antigen (CEA), cytokeratin 7 (CK7) and cytokeratin 8 (CK8) to be strongly expressed in the nests and singly arranged large tumor cells, and the surrounding epidermis was positive for CK5/6 and negative for CEA. Sporadic periodic acid-schiff (PAS)-positive cells could be seen in some areas. Conclusions: These findings strongly indicated the diagnosis of EMPD mimicking acantholytic SCCIS. Du X, Yin X, Zhou N, Zhang G, Shi H, Cao S. Extramammary Paget's disease mimicking acantholytic squamous cell carcinoma in situ: a case report. [source]


    Light-chain-restricted plasmacellular infiltrates in necrobiosis lipoidica , a clue to an underlying monoclonal gammopathy

    JOURNAL OF CUTANEOUS PATHOLOGY, Issue 4 2005
    Adina M. Cioc
    Background:, Necrobiosis lipoidica (NL) is a member of the palisading granulomatous dermatitides that is associated, in most cases, with diabetes mellitus. However, there are an increasing number of cases of NL associated with other forms of systemic disease. We describe a novel case of NL associated with a light-chain-restricted plasmacellular infiltrate; subsequent investigations established an underlying monoclonal gammopathy. Methods:, Skin biopsy material was obtained and was processed in the usual fashion for hematoxylin and eosin (H&E) examination. Immunohistochemical staining was performed by utilizing kappa and lambda monoclonal antibodies (Dako Corporation, Carpentiera, CA, USA). Kappa and lambda in situ hybridization was also performed (Ventana Medical Systems, Tucson, AZ, USA). Results:, A 55-year-old woman with a 5-year history of bilateral thigh subcutaneous nodules underwent a skin biopsy, showing typical changes of NL; there was a concomitant prominent perivascular plasmacellular infiltrate. Kappa light chain restriction was observed amid the plasmacellular infiltrate. Bone marrow biopsy and immunophenotyping studies revealed a clonal plasmacytosis with kappa light chain restriction. Conclusions:, Granulomatous inflammation, including NL, may be a cutaneous paraneoplastic expression of low-grade B-cell lymphoproliferative disease in the context of an underlying plasma cell dyscrasia. [source]


    Apparent Reactivation of a Fibrohistiocytic Proliferation with Features of Dermatofibroma and Dermatomyofibroma Following Systemic Immunosuppression

    JOURNAL OF CUTANEOUS PATHOLOGY, Issue 1 2005
    W.A. High
    A 41 year-old man presented with an atrophic, hyperpigmented plaque on the right lower abdomen present since"birth". He denied any prior activity at the site, and had been told it was a "scar" from a prenatal insult. Six months earlier, he developed idiopathic focal sclerosing glomerulonephritis and was placed on 70 mg prednisone per day. He had not demonstrated evidence of lupus eythematosus. Shortly after beginning this regimen, erythematous and tender papules developed around the quiescent plaque. He had tapered his prednisone dose to 60 mg per day, but additional papules continued to erupt. An ellipse biopsy was performed which included a portion of the atrophic plaque and several surrounding papules. Histological examination revealed a proliferation of fibrohistiocytes between and amongst collagen bundles. In some areas, fibrohistiocytes entrapped collagen in a fashion reminiscent of a dermatofibroma. In other areas, particularly that of the atrophic plaque, the fibrohistiocytes were less numerous and more delicate in appearance. Scattered rudimentary fascicles were demonstrated. Adnexal structures were preserved. Immunohistochemical staining revealed the fibrohistiocytes to be positive for factor XIIIa and actin, but negative for desmin, CD34, S-100, procollagen I, and CD68. This lesion demonstrated unique clinical/histiological aspects not well characterized in the literature. [source]


    Selected pathological, immunohistochemical and ultrastructural changes associated with an infection by Diphyllobothrium dendriticum (Nitzsch, 1824) (Cestoda) plerocercoids in Coregonus lavaretus (L.) (Coregonidae)

    JOURNAL OF FISH DISEASES, Issue 8 2007
    B S Dezfuli
    Abstract The pathological changes induced by an infection of Diphyllobothrium dendriticum (Nitzsch, 1824) plerocercoids in powan, Coregonus lavaretus (L.), from Loch Lomond, Scotland, were assessed using immunohistochemical and ultrastructural techniques. In a sample of 26 powan, the occurrence of encysted plerocercoids of D. dendriticum on the outer surface of the stomach was 38.5% (n = 10) with the number of cysts ranging from 4 to 15 and measuring 4.2 1.0 mm 3.4 0.9 mm (mean SD). Histological examination of intestinal samples also revealed plerocercoids (2,21) encapsulated within a proliferation of mesenteric fibrous tissues of the gastric wall and, occasionally, by the gut lamina propria-submucosa and lamina muscularis. In section, cysts were tri-layered and were formed from a series of concentric whorls of fibroblast and collagen fibre-based connective elements. The extent of necrosis within each muscle layer and the serosa of the stomach differed, notably within the latter that was marked by a chronic inflammatory reaction and fibrosis. Within the cyst and around it, a large number of degranulating mast cell/eosinophilic granule cells were seen, in addition to melano-macrophage centres. Immunohistochemical staining of sections of infected stomach revealed a high density of elements, in close proximity to plerocercoids, staining positive for serotonin, bombesin, substance P and galanin. Uninfected material did not present the same levels of activity. Sections through both infected and uninfected tissue were also tested for elements containing vasoactive intestinal peptide, met-enkephalin, calcitonin gene-related peptide, neuropeptide Y and nitric oxide synthase, but these were absent. [source]


    Immunohistochemical staining of liver grafts with a monoclonal antibody against HCV-Envelope 2 for recurrent hepatitis C after living donor liver transplantation

    JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY, Issue 4 2009
    Hiroshi Sadamori
    Abstract Aim:, We evaluated the expression of hepatitis C virus (HCV) antigen on liver grafts by immunohistochemical staining (IHS) using IG222 monoclonal antibody (mAb) against HCV-envelope 2 (E2). Methods:, The study material was 84 liver biopsy specimens obtained from 28 patients who underwent living donor liver transplantation (LDLT) for HCV infection. The biopsy samples were examined histopathologically, and by IHS using IG222 mAb against HCV-E2. Serum HCV-RNA level was measured in all patients. The IHS grades were compared among the three groups classified according to the time elapsed from LDLT (at 1,30, 31,179 and ,180 days post-LDLT) and among four post-transplant conditions, including acute cellular rejection (ACR). Results:, Immunoreactivity to IG222 was detected in 78.6% of the specimens obtained during the first month after LDLT, and there were no significant differences on the IHS grades between the three groups classified according to the time elapsed from LDLT. The IHS grades were significantly stronger in definite recurrent HCV (n = 12) and probable recurrent HCV (n = 7) than in definite ACR (n = 7) and other complications (n = 8). There were no significant differences in serum HCV-RNA levels among the four post-transplant conditions. There was no significant correlation between the IHS grades using IG222 mAb and serum HCV-RNA levels when data of 84 liver biopsy specimens were analyzed. Conclusions:, Constant HCV-E2 expression was observed in liver biopsy specimens obtained 1 month or longer. The strong HCV-E2 expression on liver grafts were associated with recurrent hepatitis C after LDLT, but the serum HCV-RNA levels were not. [source]


    Akt expression may predict favorable prognosis in cholangiocarcinoma

    JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY, Issue 11 2006
    Milind M Javle
    Abstract Background:, Overexpression of signaling proteins including epidermal growth factor receptor (EGFR), Akt, mitogen activated protein kinase (MAPK) and cyclooxygenase-2 (COX-2) occurs in cholangiocarcinoma cell lines. However, the prognostic value of these markers is unknown. No prior study correlated the expression of these signaling proteins with clinical outcome. Further, co-expression of these proteins has not been reported. Co-expression may reflect cross-talk between signaling pathways. The aim of this clinicopathological study was to investigate the overexpression and co-expression of EGFR and related signaling proteins in cholangiocarcinoma and explore their relationship to clinical outcome. Methods:, Twenty-four consecutive cases of cholangiocarcinoma treated from 1996 to 2002 at Roswell Park Cancer Institute were included. Immunohistochemical staining of paraffin-embedded tissue sections was performed using antibodies against Akt, p-Akt, MAPK, p-MAPK, COX-2, EGFR and p-EGFR. Two pathologists independently scored the protein expression. Results:, Cyclooxygenase-2, Akt, and p-MAPK were commonly expressed in biliary cancers (100%, 96% and 87% of malignant cells, respectively). EGFR (60%) and p-EGFR (22%) overexpression was also detected. There was a significant association between EGFR and p-EGFR (P = 0.027) and between Akt and p-Akt (P = 0.017) expression in tumor tissue. A noteworthy association was shown between MAPK and p-Akt (P = 0.054). Multivariate analysis using the Cox proportional hazard model identified the use of chemotherapy (hazard ratio [HR] = 0.039, P = 0.0002), radiation (HR = 0.176, P = 0.0441) and Akt expression (HR = 0.139, P = 0.006) as the best predictors of overall prognosis. Conclusion:, Epidermal growth factor receptor signaling intermediates are commonly expressed in cholangiocarcinoma. Expression of Akt and use of systemic chemotherapy or radiation may correlate with improved survival. [source]


    Identification of a pre-S2 mutant in hepatocytes expressing a novel marginal pattern of surface antigen in advanced diseases of chronic hepatitis B virus infection

    JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY, Issue 5 2000
    Yu-Fen Fan
    Abstract Background and Aims: The expression of hepatitis B viral (HBV) antigens in liver tissue reflects the replicative status of chronic HBV infection. We have previously recognized a novel marginal pattern of hepatitis B surface antigen (HBsAg) in hepatocytes, which usually clusters in groups and emerges at the late non-replicative phase. This study was designed to investigate whether the marginal-type HBsAg represented the gene product of a specific HBV-surface mutant. Methods: Microdissection of cirrhotic nodules homogeneously expressing marginal HBsAg was performed on two of 12 resected livers from HBsAg-seropositive patients with hepatocellular carcinoma. The gene presumably encoding marginal HBsAg was polymerase chain reaction (PCR)-cloned, sequenced and analysed. In vitro transfection and expression of the cloned surface mutant plasmids were performed on the Huh7 cell line to illustrate intrahepatic HBsAg expression. Results: Immunohistochemical staining revealed that the marginal HBsAg was positive for pre-S1 and thus contained large surface proteins. The PCR cloning and sequencing of the genes presumably encoding marginal-type HBsAg in both cases revealed the same deletion at the 5, terminus (nt 2,55) of pre-S2. A point mutation on the small-surface (S) antigen was also found in one case. The pre-S2 deletion sequence and the mutation sites of the S gene coincide with human lymphocyte antigen-restricted T- and/or B-cell epitopes. In vitro transfection of the mutant plasmid revealed a blot-like retention or accumulation of HBsAg in the cytoplasm or at the periphery of hepatocytes, accompanied by a decreased secretion of HBsAg in the culture supernatant, mimicking intrahepatic expression. Conclusion: A natural pre-S2 deletion mutant was identified in hepatocytes expressing a novel marginal pattern of HBsAg, which probably contains mutant, large, surface proteins. The biological significance of the pre-S2 deletion mutant should be interesting in view of the clustering proliferation of hepatocytes expressing marginal HBsAg. [source]


    Clinical pitfalls of pain recurrence in endometriosis arising in the posterior vaginal fornix

    JOURNAL OF OBSTETRICS AND GYNAECOLOGY RESEARCH (ELECTRONIC), Issue 2 2007
    Masahito Tachibana
    Abstract Endometriotic nodules in the lower genital tract often cause dysmenorrhea and dyspareunia. We report here a case of posterior vaginal fornix endometriosis that was overlooked for several years. We performed a trans -vaginal resection after the associated pain was not relieved by repetitive gonadotropin-releasing hormone agonist (GnRHa) therapy or abdominal surgery. After the resection, the patient's symptoms disappeared. The patient subsequently conceived and proceeded to a full-term delivery. The pathological diagnosis was ,endometriosis of the vagina.' Immunohistochemical staining revealed that the progesterone receptor-positive cells outnumbered the estrogen receptor-positive cells. We emphasize that the existence of vaginal lesions should be considered in cases in which pain has not improved despite long-term GnRHa administration, or in cases involving dyspareunia. To provide appropriate treatment, attentive evaluation and careful examination of the disease are necessary for a patient with prolonged unsatisfactory progress. [source]


    Expression of CXCL12 and its receptor CXCR4 correlates with lymph node metastasis in submucosal esophageal cancer

    JOURNAL OF SURGICAL ONCOLOGY, Issue 5 2008
    Ken Sasaki MD
    Abstract Background and Objectives The chemokine CXCL12 and its receptor CXCR4 are involved in cell migration, proliferation, and angiogenesis, and promote organ-specific localization of distant metastases in various carcinomas. We examined their expression and microvessel density (MVD) in submucosal esophageal squamous cell carcinoma (ESCC) and analyzed their connection to clinicopathological findings including lymph node micrometastasis (LMM). Methods Eighty-six patients with submucosal ESCC underwent curative resection from 1985 to 2002. Immunohistochemical staining of CXCL12, CXCR4, and CD34 was performed with primary tumors, and staining of cytokeratin was performed with dissected lymph nodes. MVD was calculated from CD34 expression, and LMM detected by cytokeratin staining. Results Expression of CXCL12, but not CXCR4, correlated with lymph node metastasis. There was no significant correlation between the expression of CXCL12 and/or CXCR4 and MVD. LMM was detected in 8 cases and 14 lymph nodes. CXCL12 expression and high MVD were found in tumors with lymph node metastasis including LMM. Furthermore, in the CXCR4-positive tumors, positive CXCL12 expression was more significantly correlated with lymph node metastasis and/or LMM than negative CXCL12 expression. Conclusions Evaluation of CXCL12 and CXCR4 expression should assist detection of lymph node metastasis including LMM in submucosal ESCC. J. Surg. Oncol. 2008;97:433,438. 2008 Wiley-Liss, Inc. [source]


    Expression of L-type amino acid transporter 1 (LAT1) in esophageal carcinoma

    JOURNAL OF SURGICAL ONCOLOGY, Issue 4 2005
    Hideaki Kobayashi MD
    Abstract Background and Objectives It has been reported that amino acid transport systems play an important role in cell proliferation. Their activity is increased in malignant cells compared to benign cells. In this study, we investigated whether L-type amino acid transporter 1 (LAT1) is expressed in human non-cancerous esophageal mucosa and esophageal squamous cell carcinoma. We also examined whether LAT1 expression is correlated with histopathological features. Methods From January 1999 to December 2001, sections of formalin-fixed, paraffin-embedded tissue from 11 cases of early esophageal carcinoma (T1) and 19 cases of advanced esophageal carcinoma (T2, T3) were entered in the study. Histopathologically, all 30 cases were squamous cell carcinoma. Immunohistochemical staining was performed using rabbit anti-LAT1 IgG, with the standard avidin-streptavidin immuno-peroxidase method. Measurement was performed by means of computer-assisted image analysis. The ratio of cells with LAT1 expression in esophageal squamous cell carcinoma and non-cancerous esophageal mucosa was used for analysis in this study. Results Non-cancerous esophageal mucosa expressed LAT1 only in the basal layer of the esophageal wall. Esophageal squamous cell carcinoma expressed LAT1 throughout the tumor. LAT1 expression in esophageal squamous cell carcinoma was significantly higher than that in non-cancerous esophageal mucosa. LAT1 expression in esophageal squamous cell carcinoma increased as the depth of invasion progressed (T1,<,T2 (P,=,0.0477), T2,<,T3 (P,=,0.0415), T1,<,T3 (P,=,0.0044)), and as the tumor size increased. Also, high LAT1 expression was significantly associated with well-differentiated carcinoma. Conclusion These results suggest that LAT1 plays a significant role in cell proliferation, differentiation, and invasion in esophageal squamous cell carcinoma. J. Surg. Oncol. 2005;90:233,238. 2005 Wiley-Liss, Inc. [source]


    Co-localization of von Willebrand factor with platelet thrombi, tissue factor and platelets with fibrin, and consistent presence of inflammatory cells in coronary thrombi obtained by an aspiration device from patients with acute myocardial infarction

    JOURNAL OF THROMBOSIS AND HAEMOSTASIS, Issue 1 2006
    Y. HOSHIBA
    Summary.,Background:,Detailed histochemical analysis of coronary thrombi obtained freshly from acute phase of myocardial infarction patients may provide information necessary to understand the mechanism of coronary occlusive thrombus formation. Methods and Results:,Coronary thrombi causing myocardial infarction were obtained from 10 consecutive patients of myocardial infarction in the acute phase, using a newly developed aspiration catheter. All the fixed specimens of coronary thrombi, by hematoxylin and eosin staining, were found to contain three major constituents, namely, platelets, densely packed fibrin and inflammatory cells, including polymorphonuclear and mononuclear cells, although their distribution in each specimen is totally heterogeneous. Immunohistochemical staining revealed the prominent presence of von Willebrand factor (VWF) at the sites of platelet accumulation, presence of tissue factor and platelets at the sites of deposition of fibrin fibrils. It also revealed the presence of CD16-, CD45- and CD34-positive cells, yet the functional roles of these cells have still to be elucidated. There are weak positive correlation between the number of inflammatory cells involved in the unit area of coronary thrombi specimen and the time of collection of the specimens after the onset of chest pain. Conclusions:,In spite of various limitations, our results contain information suggesting the possible role of VWF in platelet-thrombus formation, possible important role played by tissue factor and activated platelets in the formation of fibrin fibrils, and the positive relationship between inflammatory cells migration and the formation of occlusive thrombi in human coronary arteries. [source]


    Expression of gap junction protein connexin 32 in chronic liver diseases

    LIVER INTERNATIONAL, Issue 2 2000
    Kazuaki Yamaoka
    Abstract:Background: Gap junctions contain intercellular channels through which contacting cells communicate directly. The expression of connexin 32, a major gap junction protein in the liver, during the progression of chronic liver diseases has not yet been clarified. Methods: Immunohistochemical staining was performed using anti-connexin 32 antibody on 6 specimens of normal human liver, 7 of chronic viral hepatitis, and 7 of liver cirrhosis. Results: The number of gap junction plaques in chronic viral hepatitis and liver cirrhosis was significantly smaller than that in normal liver (103502180 and 75503040 vs 225603700 spots/mm2, p<0.01). The number of gap junction plaques tended to be lower in liver cirrhosis than in chronic viral hepatitis. Conclusion: These results suggest that in chronic liver diseases impaired intercellular communication between hepatocytes occurs. [source]


    Preparation of enzymatically active human Myc-tagged-NCre recombinase exhibiting immunoreactivity with anti-Myc antibody

    MOLECULAR REPRODUCTION & DEVELOPMENT, Issue 11 2006
    Satoshi Watanabe
    Abstract The Cre- loxP system has been recognized as a tool for conditional gene targeting in mice. However, most anti-Cre antibodies fail to react with Cre expressed in vivo. In an attempt to directly detect Cre by antibodies in vivo, we constructed the tagged-NCre (NCreMH) gene by connecting the human Myc and His tag sequences to the 3, end of the NCre gene carrying a nuclear localizing signal (NLS) sequence. The production of NCre protein and the recombinase activity were detected after co-transfection with pCMV-NCreMH and pCETZ-17 carrying the loxP -flanked lacZ gene into NIH3T3 cells. This activity was also confirmed in vivo after gene transfer of pCMV-NCreMH and pCRTEIL-6 carrying loxP -flanked HcRed1 and EGFP cDNAs, into oviductal epithelium by electroporation. Immunohistochemical staining using anti-Myc antibody demonstrated that the area positive for enhanced green fluorescent protein (EGFP) fluorescence was immunostained with the antibody. These findings indicate that NCreMH is useful as an alternative to NCre for gene targeting. Mol. Reprod. Dev. 73: 1345,1352, 2006. 2006 Wiley-Liss, Inc. [source]


    Soluble Fas (FasB) regulates luteal cell apoptosis during luteolysis in murine ovaries

    MOLECULAR REPRODUCTION & DEVELOPMENT, Issue 4 2003
    Kohji Komatsu
    Abstract During luteolysis, luteal cell apoptosis is induced by the Fas ligand (FasL)/Fas system. In murine luteal bodies, we demonstrated the expression of mRNA of soluble form of Fas (FasB), which binds to FasL and prevents apoptosis induction. By in situ hybridization, strong expression of FasB mRNA was observed in normal luteal bodies, in which no apoptotic cells were detected, but negative/trace expression in regressing luteal bodies, in which many apoptotic cells were observed. Immunohistochemical staining revealed that Fas and TNF-, were localized in both normal and regressing luteal bodies, but IFN-, was localized only in regressing luteal bodies. Apoptosis was induced in primary cultured luteal cells, when they were pretreated with TNF-, and IFN-, and then incubated with TNF-,, IFN-,, and mouse recombinant FasL (rFasL). However, no apoptosis was detected in the cells, when they were treated with rFasL alone, TNF-, alone, IFN-, alone, TNF-, and rFasL, IFN-, and rFasL, or TNF-, and IFN-,. Fas mRNA expression in cultured luteal cells was up-regulated by the treatment of TNF-,, IFN-,, or TNF-, and IFN-,. The expression of FasB mRNA was down-regulated, when the cells were treated with TNF-, and IFN-,, but its expression was not changed by the treatment of TNF-, alone or IFN-, alone. We conclude that FasB inhibits the apoptosis induction in luteal cells of normal luteal bodies, and that decreased FasB production induced by TNF-, and IFN-, made possible the apoptosis induction in the luteal cells of regressing luteal bodies. Mol. Reprod. Dev. 65: 345,352, 2003. 2003 Wiley-Liss, Inc. [source]