Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0268596 (EMA)
 2,520 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Microwave oven (mwo) is used to stimulate tissue fixation and to retrieve antigens damaged by fixation. Heavy metal salt solutions, water, and citric acid buffer (cab) have been suggested for this purpose. A serie of tumors treated with cab and phosphate-buffered saline (pbs) with mwo were studied immunohistochemically with 24 antibodies. Controls were treated in the same way, except for microwaving. The antibodies were directed against antigens of the following tumors: breast and prostate carcinoma, carcinoid, lymphoma and melanoma. The results showed that cab enhanced the immunoreactivity of the following antigens: estrogen receptors (AMAC), progesterone receptors (Novocastra), HMB45, vimentin, leukocyte common antigen, PCNA, p53, MIB-1 (Ki-67) and prostatic specific antigen. The antigens that did not improve their immunoreactivity, when compared with the control series were: factor VIII, keratin, Leu 22, L26, neuron-specific enolase, CEA, chromogranin, HBME-1, smooth muscle actin and EMA. Microwaving equally improved protein S100 and desmin either with cab or pbs. The only antigen that improved with pbs was actin. The results with B72.3 and NKI/C3 were poor and not reliable. In conclusion microwaving with cab enhances the immunoreactivity of the antibodies mentioned above leading to an increase in sensibility without loosing specificity.
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PMID:[Antigen retrieval by microwave oven with buffer of citric acid]. 799 28

A 25-year-old patient with a rapidly growing sarcomatoid carcinoma of the urinary bladder is reported. The diagnosis was made on the basis of extended atypical proliferations of spindle or pleomorphic cells in the area of pelvic floor and the radix of the penis. The tumor showed invasion of the blood and a high Ki-67 growth fraction up to 40%. Immunohistochemically, the reactions with antibodies against cytokeratin, EMA, and vimentin were positive, while negative results were obtained in reactions with antibodies against desmin, actin, PSA, S 100, human epithelial antigen (Ber-EP4), and cytokeratin 13. The differential diagnosis against myosarcomas, pseudosarcomatous lesions, and inflammatory pseudotumours is discussed. After radical surgery a pelvic recurrence and pulmonary metastases developed, which led to the patient's death 3 months later. This case shows that sarcomatoid carcinomas of the urinary bladder can be found even in young people.
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PMID:[Sarcomatoid carcinoma of the bladder in a 25-year-old man]. 857 May 63

Paraffin-embedded specimens from 21 patients (mean age 49 years) with malignant melanocytic tumors of the central nervous system were studied. Extraneuronal primary tumors were situated at the trunk (38%), the lower (14%) or upper extremity (10%), and the head/neck region (5%). In 33% no extraneural primary tumor could be detected. The tumor location was frontal (19%), occipital (19%), parietal, spinal, multifocally (14%, respectively), or temporal (5%). Four subtypes were distinguished according to the predominant histological cell type: pleomorphic, epithelioid, spindle- and mixed-cell tumors. 29% contained no melanin, most of them belonging to the epithelioid subtype. The morphology and immunohistochemical reactivity for different antibodies (KL-1, EMA, VIM, HMB-45, NKI-C3, S-100, and MIB-1/Ki-67) were assessed. Positive staining was demonstrated for HMB-45 (in 86% of cases), NKI-C3 (100%), S-100 (95%), vimentin (75%), and KL-1 (33%). No expression of the cytokeratin EMA could be detected. The mean proliferation index measured by MIB-1 immunoreactivity was 21%. The 4 histological subtypes were found to express different antigen patterns. In the analysis of CNS tumors of unknown origin, the panel of antibodies used for diagnosis should include HMB-45 as the most specific marker for malignant melanoma.
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PMID:Malignant melanoma in the CNS, subtyping and immunocytochemistry. 940 2

Although no animal is a perfect skin model for the study of toxicological and therapeutic agents, structurally the pig may be superior to even non-human primates. Because our work involves effects of toxicological and therapeutic agents on the skin, we wanted to identify stains which may prove useful as well as determine cross-reactivity of some newer antihuman antibodies. We performed a battery of formalin-fixed skin from weanling pigs and minipigs. The battery of antibodies included LCA, CD3, OPD-4, CD34, UCHL-1, L-26, KP-1, MAC-387, Factor XIIIa, Leu-7, S-100 protein, HMB-45, GFAP, synaptophysin, neurofilament protein, ubiquitin, vimentin, type IV collagen, laminin, fibronectin, Factor VIII related antigen, Desmin-M, smooth muscle actin, cytokeratin 7, cytokeratin 20, AEI/AE3, CAM 5.2, EMA, GCDFP, Ki-67, and PCNA. Immunohistochemical stains for CD3, Leu-7, S-100 protein, type IV collagen, laminin, Factor VIII related antigen, GFAP, synaptophysin, neurofilament protein, ubiquitin, smooth muscle actin, vimentin, Desmin-M, cytokeratin 7, cytokeratin 20, AE1/AE3, CAM 5.2, Ki-67 and PCNA showed consistent cross-reactivity. In formalin-fixed tissue, only antibodies to lymphoreticular cells showed poor cross-reactivity. A high percentage of the remaining antibodies did show good cross-reactivity but with some interesting similarities and differences in specificity.
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PMID:Sensitivity of cross-reacting antihuman antibodies in formalin-fixed porcine skin: including antibodies to proliferation antigens and cytokeratins with specificity in the skin. 974 58

Heterotopic glial nodules occur most commonly in the head and neck area, and are theorized to arise following abnormalities in the development of the facial and skull bone plates. However, in spite of the fact that some of these lesions are associated with communication with the central nervous system (CNS), the lack of a meningeal component, argues against simple herniation and separation of brain tissue through a defect in the skull. We present an infant with a nodule directly over the spine present in the T-12 region with no skin abnormalities. Magnetic resonance imaging (MRI) and computerized axial tomography (CT) showed no spinal abnormalities with an overlying fibrotic soft tissue mass. The patient had no other associated clinical findings. Histologic findings showed a cellular component arising within the reticular dermis with a deep circumscribed margin. The nodule contained irregularly shaped cells containing abundant cytoplasm and indistinct cellular margins with bland nuclei. These cells were clustered around and between a fibro-mucinous stroma. Immunohistochemical stains showed positive staining for S-100 protein, vimentin, GFAP, NSE, and CD57, and negative staining for Ki-67, CD34, Neurofilament protein, cytokeratin, and EMA. The spindle cells showed positive staining for CD34 and vimentin. The clinical and histologic features and immunohistochemical profiles are used to separate this lesion from the closely related, ependymal rests, ependymomas, and primary cutaneous chorodomas.
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PMID:Glial heterotopia in the subcutaneous tissue overlying T-12. 1059 45

It has recently been shown that reactive bile ductules display neuroendocrine features, including immunoreactivity for the neural cell adhesion molecule (NCAM). In this study we have compared the immunohistochemical expression of NCAM with that of HEA-125 (biliary specific) and LKM-1 (hepatocyte specific) and other markers relevant to morphogenesis (Bcl-2, EMA) and cell proliferation (Ki-67) in cryostat sections from different chronic liver diseases and from fetal livers at different gestational ages. In parallel, viable NCAM-positive ductular cells were purified from collagenase digests of cirrhotic livers by immunomagnetic separation and characterized by immunocytochemistry and transmission electron microscopy. We demonstrated that reactive ductules with atypical morphology coexpressed NCAM and Bcl-2 and were found mainly in congenital diseases associated with ductal plate malformation and in primary cholangiopathies. On the contrary, reactive ductules with typical morphology were negative for NCAM/Bcl-2 and positive for EMA. Reactive ductules coexpressing NCAM/Bcl-2 were negative for the proliferation marker Ki-67 and appeared to be directly connected with periportal hepatocytes. In fetal livers NCAM/Bcl-2 was transiently expressed during the early developmental stages of ductal plate (10-16 weeks) and started to disappear as the ductal plate began duplicating. NCAM-positive ductal plate cells were Ki-67 negative, becoming positive in duplicated segments. Thus the histogenesis of ductular reactive cells seems to recapitulate the early stages of biliary ontogenesis. In primary cholangiopathies and ductal plate malformations, these cells do not appear to maturate further, and thus abundant ductular structures coexist with vanishing mature ducts. These NCAM-positive ductular cells were immunopurified from patients with chronic cholestatic liver diseases and showed ultrastructural features consistent with a less differentiated phenotype than mature cholangiocytes. These isolated cells represent a useful model for in vitro studies.
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PMID:Characterization and isolation of ductular cells coexpressing neural cell adhesion molecule and Bcl-2 from primary cholangiopathies and ductal plate malformations. 1079 72

Serous adenocarcinoma of the endocervix is a rare carcinoma similar to the serous carcinoma of the ovary and the endometrium. We report a case of a 63-year-old woman with papillary serous adenocarcinoma arising within the endocervix, describing the clinical presentation and the morphologic characteristics of this rare neoplasm. A detailed immunohistochemical analysis on the expression of low- and high-molecular weight cytokeratins (AE1 and AE3), EMA, CEA, vimentin, B72.3, nm23, estrogen and progesterone receptors, LeuM1 (CD15), p53, Ki-67 antigen, and PCNA by tumor cells has also been carried out, which to our knowledge has not been previously reported.
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PMID:Papillary serous adenocarcinoma of the endocervix: A rare neoplasm. Immunohistochemical profile. 1124 Jun 96

Sixty cases of uterine adenomatoid tumors (ATs) are reported. All except four were incidental findings in hysterectomy specimens, three of these being discovered preoperatively as large multicystic tumors. ATs were classified into two distinctive macroscopic patterns: small, solid tumors and large, cystic ones. The 56 small, solid ATs ranged from 0.2 to 3.5 cm, (average 2.1 cm); 48 were nodular and 8 diffuse. The four large, cystic tumors ranged from 7 to 10 cm. Inflammation occurred in 65% of the tumors, and a smooth muscle reaction, identified by an increased Ki-67 index, was present in most cases. Both types were histologically similar except for the presence of short papillae in cystic tumors, which also showed serosal involvement. Both were immunoreactive for cytokeratins, calretinin, HMBE-1, and vimentin. Estrogen and progesterone nuclear receptors and EMA were negative. These tumors represent a spectrum ranging from small and solid to large and cystic ATs in the female genital tract, whereas outside the genital tract they are morphologically similar to multicystic mesothelioma. Although a reactive origin for ATs often seems plausible, especially when inflammation is present, their neoplastic nature should not be ignored.
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PMID:Adenomatoid tumors of the uterus: an analysis of 60 cases. 1206 80

Authors present an additional case report of pleomorphic hyalinizing angiectatic tumor (PHAT), only recently recognized entity amongst the soft tissue tumors. 63-year-old man underwent surgery for subcutaneous tumor growing on the forearm. Grossly, ovoid well demarcated tumor 4.0 x 3.5 x 2.5 cm was removed. Histologically, hypovascular areas of spindle-cells arranged in sheets and fascicles resembling spindle-cell sarcoma and areas rich on ectatic vessels with fibrin deposits or thickened hyalinized walls were present. Some cells contained intranuclear cytoplasmatic inclusions, lobulated nuclei with or without prominent nucleoli or multiple nuclei. Mitoses were less than 1 per 30 HPF, Ki-67 nuclear positivity was observed in 2.6% of tumor cells. Immunohistochemically, cells were positive with vimentin, but negative for CD34, S100, desmin, smooth-muscle actin, EMA, VWF, CD99, bcl-2 and cytokeratins. The patient did well, without recurrent tumor after 13 months follow-up. Spectrum of tumors including solitary fibrous tumor, giant-cell angiofibroma, neurilemmoma, malignant fibrous histiocytoma and acral myxoinflammatory tumor with atypical bizarre giant cells is discussed in differential diagnosis.
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PMID:Pleomorphic hyalinizing angiectatic tumor. 1181 37

Chondrosarcomas are malignant cartilage-forming tumors that represent the second most common malignant solid tumor of bone. These biologically poorly understood neoplasms vary considerably in clinical presentation and biologic behavior. Chemotherapy and radiation therapy are generally ineffective. Here we describe the establishment and characterization of a new human chondrosarcoma cell line named ch-2879, and we compare the cell line with its tumor of origin. The cell line was established from a recurrent grade 3 chondrosarcoma of the chest wall and characterized by growth kinetics and morphologic studies. Immunocytochemistry and RT-PCR were performed to examine the expression of cartilage-specific phenotypes. Genetic characterization was performed using cytogenetics, fluorescence in situ hybridization, flow cytometry, and molecular techniques for analysis of the genes implicated in cell cycle control, amplification of MDM2, CDK4, and Cyclin D1, and mutations in the p53 gene. ch-2879 cells were subcultured for more than 80 passages. They expressed vimentin, HNK-1, HBA-71, Ki-67, cyclin D1, Fli-1, S-100, p21, p27, and p53 and were negative for cytokeratin, EMA, p14, p16, MDM2, Rb, and c-erb-b2 antigens. Cytogenetically the recurrent tumor showed a hyperhaploid karyotype with clonal numerical and structural abnormalities. The sole structural abnormality was a chromosome derivative of a t(1;21) translocation. The cell line at passage 3 showed two populations: the hyperhaploid and an exactly duplicated, hypotriploid population. After the 18th passage, only the hypotriploid population was present. The cells expressed collagen 2. Molecular comparison of the primary and recurrent tumor evidenced an in vivo molecular change consisting of a deletion of 9p21 genes in the recurrence, probably caused by a selection process. Because of its gene expression profile, including expression of genes implicated in chondrogenesis in uncoated plastic dishes, this cell line may prove useful for cellular and molecular studies as well as studies of chondrosarcoma characterization and treatment.
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PMID:Establishment and characterization of a continuous human chondrosarcoma cell line, ch-2879: comparative histologic and genetic studies with its tumor of origin. 1280 23


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