Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.2.1.17 (lysozyme)
 21,489 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In pleural and peritoneal effusions, the distinction between mesothelial cells and histiocytic cells is fairly often difficult. This distinction is specially important in malignant effusions, where such reactive cells can be confused with tumoral ones. In order to increase the accuracy of cytological diagnosis, the immunocytochemical reactivity with 13 antibodies was studied. Four antibodies (vimentin, lysozyme, monoclonal keratin, OKM1) realise a panel specially useful for the characterization of mesothelial and histiocytic cells in most cases of benign or malignant effusions.
 ...
PMID:[Contribution of immunocytochemical marking of benign cells to the diagnosis of serous effusions]. 381 72

We describe a malignant rhabdoid tumour of the prostatic region in a 14-year old boy. The tumour showed positive immunoreactivity for epidermal prekeratin, monoclonal cytokeratin, epithelial membrane antigen, carcinoembryonic antigen and monoclonal vimentin but was negative for myoglobin, alfa-fetoprotein and lysozyme. Electron microscopy revealed pleomorphic cells with collections of paranuclear intermediate filaments, sheaves of tonofilaments and abundant microvilli in some tumour cells. Epithelial derivation was also suggested by occasional intracytoplasmic lumina and rare cell junctions.
 ...
PMID:Malignant rhabdoid tumor of the prostatic region. Immunohistological and ultrastructural evidence for epithelial origin. 392 13

Two patients, a 62-year-old man and a 50-year-old woman, both with deep-seated atypical endothelial tumors within the wide concept of histiocytoid hemangioma, are reported. In case 1, the tumor involved the brachial vein, and, in case 2, a medium-sized vein of the anterior neck. In both cases the involved vein was occluded. Angiography in case 1 suggested a tumor that was enclosed by the same fibrous sheath, the conjunctiva vasorum, that enclosed the occluded vein and its concomitant artery. Both tumors were solid, without conspicuous vascular differentiation by light microscopy. Such differentiation, however, was evident from the electron-microscopic examination, which showed tumor cells with endothelial features forming primitive vascular structures. Positive lectin histochemistry (Ulex Europeus I) and positive immunohistochemistry for factor-VIII-related antigen, actin, and vimentin also gave strong support for the endothelial differentiation of the tumor cells. Immunohistochemical studies of markers for histiocytic (alpha 1-antitrypsin, ferritin, lysozyme), epithelial (cytokeratin, epithelial membrane antigen), and neuroectodermal (S-100 protein) and skeletal muscle (myoglobin) differentiation were negative. At follow-up, after 7 years and 2 years, respectively, there were no signs of local recurrence or metastasis.
 ...
PMID:Atypical hemangioendothelioma of venous origin. A clinicopathologic, angiographic, immunohistochemical, and ultrastructural study of two endothelial tumors within the concept of histiocytoid hemangioma. 393 54

In a collection of parotid gland tumors the presence of different antigens was studied by immuno-histochemical methods. The series was composed of different tumors: adeno- and cystadenocarcinomas, adenoid-cystic carcinomas, salivary duct carcinomas, mucoepidermoid tumors, squamous cell carcinomas and anaplastic carcinomas. The following substances were studied: 1. Substances normally present in salivary glands like lysozyme and lactoferrin. 2. Oncofetal antigens: carcinoembryonic antigen (CEA) and alpha-fetoprotein (AFP). 3. Different classes of intermediate-sized filaments: prekeratin and vimentin. The presence of lactoferrin and carcinoembryonic antigen could be demonstrated in the glandular differentiated tumors, whereas the squamous cell carcinomas, although CEA positive, were lactoferrin negative. The anaplastic carcinomas were negative for lactoferrin and CEA. Lysozyme and AFP could not be demonstrated in the tumors of our material. Mucoepidermoid tumors and squamous cell carcinomas were clearly positive for prekeratin filaments whereas the stromal part showed a vimentin filaments in the cytoplasm of fibroblasts. These antigens provide a useful tool to distinguish between the epithelial and mesenchymal tumors.
 ...
PMID:Tumor antigens in neoplasms of the human parotid gland. 618 17

The group of tumour markers contain antigens and cell products which can be demonstrated in tumour cells by immunocytochemical methods (immunofluorescence, immunoperoxidase) and can, thus, be analysed for the classification of tumour. In human salivary gland tumours the distribution of cytoplasmatic antigens as components of the cytoskeleton, the occurrence of cell membrane antigens and of enzymatic cell products is demonstrated. Prekeratin, as an intermediate-sized filament protein, is a specific marker of epithelial tumours, whereas vimentin is a marker of mesenchymal cells. A special feature is the occurrence of prekeratin and vimentin in spindle-shaped cells of pleomorphic adenomas. The tumour-associated carcinoembryonic antigen (CEA) is found in glandular tumours and highly differentiated keratinized squamous cell carcinomas. With regard to enzymatic cell products, lactoferrin is present in glandular tumours and amylase in acinic cell tumours, but lysozyme is not detectable. The implementation of tumour markers contributes not only to an improvement in tumour diagnosis, but opens up new aspects in the cyto- and histogenesis of tumours.
 ...
PMID:[Use of tumor markers in the diagnosis of salivary gland tumors]. 618 37

Presence and distribution of S-100 protein (S-100), neuron-specific enolase (NSE), cytokeratin polypeptides, glial fibrillary acidic protein (GFAP), vimentin, actin, lysozyme and pituitary hormones (prolactin, hGH, ACTH, beta-FSH, beta-LH, beta-TSH, alpha subunit) in folliculo-stellate cells (FSC) were studied in seven normal human pituitary glands and 28 pituitary adenomas using peroxidase-antiperoxidase and the avidin-biotin immunohistochemical techniques. Approximately 5% of the cells of the adenohypophysis were agranular, non-hormone-producing FSC most of which showed a conspicuous and strong reaction with S-100 antibodies but some were, in addition, GFAP- and vimentin-positive. In contrast to endocrine cells (EC), FSC were not decorated by antibodies to NSE or cytokeratins. In addition to supportive functions, these cells, due to their close special relationship to EC, seem to have transport and other metabolic functions yet to be elucidated. By their S-100 reactivity and their distribution FSC are comparable to glial cells of the central and Schwann and satellite cells of the peripheral nervous system (PNS) as well as to supportive cells in neuroendocrine organs and related tumors (e.g., pheochromocytomas, paragangliomas, carcinoids). With one exception, S-100 reactive FSC were not found in pituitary adenomas. The immunohistochemical demonstration of S-100 protein in pituitary tissue is, therefore, a reliable aid in the discrimination between adenomas and normal pituitary tissue, particularly in small and poorly preserved specimens.(ABSTRACT TRUNCATED AT 250 WORDS)
 ...
PMID:Immunohistochemistry of folliculo-stellate cells in normal human adenohypophyses and in pituitary adenomas. 651

Immunohistochemical analysis was carried out to examine the characteristics of nasopharyngeal carcinoma (NPC) using 38 biopsy cases obtained from southern China. These cases were divided into 3 groups according to their predominant pattern associated with cell and tissue differentiation which is based on World Health Organization (WHO) classification as follows: 6 cases of squamous cell carcinoma (16%), 25 cases of differentiated non-keratinizing carcinoma (66%), 7 cases of undifferentiated carcinoma (18%). All tumor tissues reacted with MB-1, but they did not react with L26 (CD20), 4KB5 (CD45R), MT-1, and leukocyte common antigen (LCA). Keratin and epithelial membrane antigen (EMA) as epithelial markers focally stained NPC tissues in all cases. Carcinoembryonic antigen (CEA)-positive staining was detected in 7 (28%) of the 25 cases of differentiated non-keratinizing carcinoma and in 3 (43%) of the 7 cases of undifferentiated carcinoma; thus, of 38 cases, 10 (26%) were CEA-positive. On the other hand, squamous cell carcinoma cases did not react with CEA. These NPC tissues did not react with S-100 protein, alpha-1-antichymotrypsin (ACT), lysozyme, vimentin, and desmin. Therefore, it is concluded that some cases of NPC are difficult to distinguish from malignant lymphoma. In certain cases, NPC may be distinguished from malignant lymphoma, using immunohistochemical methods for the detection of MB-1, keratin, EMA, and LCA. Specifically, this evidence suggests that MB-1 may be useful as a tumor marker of NPC. Moreover, the CEA reaction to NPC may be related to the cell differentiation.
 ...
PMID:B-cell antigen marker expression in nasopharyngeal carcinoma. 751 May 13

A total of 14 cases of clear cell carcinoma of salivary glands were evaluated by immunohistochemical methods using monoclonal antibodies to cytokeratin (K1.1 and K8.12), vimentin, S-100 alpha and beta subunits, neuron-specific enolase (NSE), glial fibrillary acidic protein (GFAP), MAM-3 and MAM-6 antigens and proliferating cell nuclear antigen (PCNA), as well as polyclonal antibodies to lysozyme (Ly), lactoferrin (la) and Alpha-1-antichymotrypsin (alpha 1-Ach). Histopathologically, the carcinoma was characterized by round or polygonal tumor cells with cytoplasm that does not stain with hematoxylin and eosin, nuclei with little pleomorphism and few or no mitotic figures, and growing in solid sheets, small nests or cords with collagenous stroma. Cytokeratin KL1 and K8.12 was present in few tumor cells with almost negligible to strong reaction in all cases, vimentin in 6, GFAP in 5 cases with multiple-expression of cytokeratin K8.12, vimentin and GFAP in 5 cases. S-100 protein immunoreactivity was the most prominent feature with more intense reaction of S-100 beta than S-100 alpha subunit. NSE reactivity was seen in 6 cases. Ly, La, a1-ch, MAM-3 and MAM-6 antigens were localized in clear cells with various reaction intensities. The authors conclude that the clear tumor cells in clear cell carcinoma of salivary glands are not myoepithelial in origin but epithelial or neuroectodermal/neural crest in origin, showing ductal differentiation at the immunohistochemical level.
 ...
PMID:Clear cell carcinoma of salivary glands: immunohistochemical evaluation of clear tumor cells. 752 Nov 53

A subcutaneously transplantable meningeal tumour (MM-KMY) was derived from a spontaneous malignant meningioma which developed in the cerebellar meninges of a female F344 rat. MM-KMY was subjected to 25 serial passages in syngeneic male and female rats. The transplants grew in 8 weeks into a nodule with an average diameter of 5.7 cm and average weight of 125.2 g. MM-KMY possessed large cysts containing fluid and necrotic tissue. Metastases frequently occurred in the lungs of MM-KMY-bearing rats. Histologically, both the original tumour and MM-KMY consisted of round to fusiform neoplastic cells of varying size, with nuclear pleomorphism. Mitotic figures occurred frequently. MM-KMY cells were positive for vimentin. Ultrastructurally, the cells showed desmosome-like structures, interdigitating processes and cytoplasmic intermediate filaments, suggesting an arachnoid cell origin. Abnormal accumulations of hyaline droplets in renal tubular epithelial cells were frequently observed in MM-KMY-bearing rats, suggesting overload of low molecular proteins in the renal tubules. The droplets gave a faint immunoreaction for lysozyme. The relation between the appearance of renal tubular hyaline droplets and the growth of MM-KMY remains to be determined. MM-KMY may prove useful for studying the biological behaviour and morphogenesis of meningeal tumours.
 ...
PMID:Biological behaviour and morphological characteristics of a transplantable tumour (MM-KMY) derived from a malignant meningioma in an F344 rat. 753 Jul 32

The origin of pulmonary multinucleate giant cells (MGC) in porcine dermatosis vegetans was studied in six Norwegian Landrace pigs ages 4 (male), 5 (female), 6 (female), 10 (female), and 12 (one male, one female) weeks, using an avidin biotin peroxidase and alkaline phosphatase complex immunohistochemical method on sections of formalin- and ethanol-fixed and frozen tissue specimens. Well-characterized, commercially available antisera/monoclonal antibodies to keratin, vimentin, lysozyme, a monocytic antigen, and a myelomonocytic antigen were used. The immunoreactivity to intermediate-sized filaments in MGC was negative for keratins and positive for vimentin. In addition, a positive reaction was found in alveolar macrophages, chondrocytes, fibrocytes, alveolar lymphocytes, and granulocytes in ethanol-fixed tissue. Marked masking was observed in formalin-fixed tissue. Antilysozyme antiserum gave a positive cytoplasmic reaction in alveolar macrophages and MGC, although the reaction was variable in ethanol-fixed tissue. In trypsinized formalin-fixed tissue, a moderate and more consistent cytoplasmic reaction was observed in alveolar macrophages and MGC. Two monoclonal antibodies that identify human cells of the MMS, EMB 11 and Mac 387, were negative for EMB 11 in ethanol-fixed and frozen sections, whereas Mac 387 showed a positive and specific cytoplasmic immunoreaction in alveolar macrophages and small MGC in ethanol- and formalin-fixed tissue. Pulmonary MGC in dermatosis vegetans are derived from mesenchymal cells, and substantial evidence is provided in support of a monocyte/macrophage origin based on a positive reaction for lysozyme and a myelomonocytic antigen. The importance of adequate fixatives for immunohistochemical demonstration of cell-specific markers is clearly shown.
 ...
PMID:An immunohistochemical study on the cytogenetic origin of pulmonary multinucleate giant cells in porcine dermatosis vegetans. 768 69


<< Previous 1 2 3 4 5 6 7 8 9 10