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

A case of a distinctive vascular neoplasm of the spleen in a 3-year-old boy is described. The tumor was characterized histologically by a biphasic growth pattern, with discrete nodular areas composed of atypical round, epithelioid cells with large nuclei and prominent nucleoli, and areas showing an intricate proliferation of vascular channels lined by elongated spindle cells. Immunohistochemical studies showed cytoplasmic staining of the tumor cells with factor VIII-related antigen, Ulex europaeus lectin, and vimentin antibodies. Stains for keratin, actin, desmin, lysozyme, and S-100 protein were negative in the tumor cells. Electron microscopy revealed a fairly cohesive population of cells that contained mature and immature cell junctions, basal lamina material, and surface pinocytotic activity consistent with vascular endothelial cells. Five-year follow-up has shown the patient to be alive and free of disease. This case appears to represent a previously unreported primary vascular neoplasm of the spleen showing combined features of epithelioid and spindle-cell hemangioendothelioma. The lesion should be distinguished from other benign and malignant vascular proliferations of the spleen such as Kaposi's sarcoma, angiosarcoma, and the recently described littoral-cell angioma.
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PMID:Epithelioid and spindle-cell hemangioendothelioma of the spleen. Report of a distinctive splenic vascular neoplasm of childhood. 149 19

Hyaline globules (HG) were detected in 51 of 54 Kaposi's sarcoma (KS) lesions (94.4%), including all four non-acquired immunodeficiency syndrome (AIDS) cases of cutaneous KS in this group of cases. Thus, there was no correlation between the presence of HG and the presence or absence of AIDS, nor could we demonstrate any relationship between the presence or prominence of HG and either the histologic pattern or anatomical distribution of KS. HG were located mainly in the cytoplasm of perivascular cells, histiocytoid cells, and spindle-shaped cells and occasionally in endothelial cells lining vessels or slit-like spaces. Extracellular HG were also seen. HG stained positively with periodic acid-Schiff with and without diastase digestion and with phosphotungstic acid-hematoxylin. HG were immunohistochemically negative for alpha 1-antitrypsin, alpha 1-antichymotrypsin, lysozyme, and Factor VIII-related antigen, but the cells containing HG were often positive for alpha 1-antichymotrypsin and occasionally for alpha 1-antitrypsin and Factor VIII-related antigen. HG were also detected in five of six angiosarcomas, two of ten pyogenic granulomas, and seven of 32 inflammatory granulation tissues. These were immunohistochemically similar to HG in KS. Thus, HG are not specific for KS. We support the interpretation that HG are most likely digested erythrocytes.
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PMID:Hyaline globules in Kaposi's sarcoma: a light microscopic and immunohistochemical study. 171 Aug 5

Thirty-three cases of European Kaposi's sarcoma (KS) were investigated by immunohistochemical methods using a panel of antibodies specific for the markers of the cell types proposed for its histogenesis in the literature: S-100 protein for Schwann cells; lysozyme for histiocytes; alpha-actin, desmin and vimentin for pericytes and other mesenchyme-derived cells; factor VIIIR:Ag and Ulex europaeus agglutinin-I for endothelial cells. Antifibronectin antibodies were also used in order to investigate some functional activities of the proliferating cells. Immunohistochemical results showed that KS cells were diffusely positive for vimentin and alpha-actin and negative for all other cell markers. Furthermore, KS cells were constantly surrounded by fibronectin-positive material. Since the KS cells are diffusely positive for vimentin, they may be considered a monotypic proliferation of mesenchyme-derived cells which lack the markers of full endothelial cell differentiation; however, the occurrence of fibronectin-positive material around them suggests that these cells are actively proliferating endothelial cells and their diffuse positivity for alpha-actin suggests a possible differentiation to pericytic cells. In conclusion KS cells may be considered as mesenchymal cells which are at an intermediate stage of maturity or immaturity in vascular differentiation.
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PMID:Immunocytochemical profile of Kaposi's sarcoma cells: their reactivity to a panel of antibodies directed against different tissue cell markers. 249 8

The nature of hyaline bodies (HB) in Kaposi's sarcoma (KS) has been investigated by electron microscopy (EM) and immunohistochemical methods. Paraffin sections from 45 cases of KS selected on the basis of their high content of HB were challenged with antisera against factor VIIIR:Ag, carcinoembryonic antigen (CEA), alpha-fetoprotein (AFP), alpha 1-antitrypsin (A1AT), fibrinogen, hemoglobin, alpha-actin and lysozyme. HB showed positivity for all the antibodies except for the last two. By EM, HB showed features consistent with red blood cell, fibrin and platelet phagocytosis. Therefore, HB in KS are considered to be the expression of an indiscriminate process of phagocytosis which involves not only erythrocytes and platelets, but also other substances such as fibrinogen, factor VIIIR:Ag, A1AT, CEA and AFP.
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PMID:Hyaline bodies in Kaposi's sarcoma: an immunocytochemical and ultrastructural study. 253 47

Immunological, hematological, and biochemical studies were done at the time of referral in 135 homosexual subjects, 28 of whom were symptom free (SF), 74 of whom had the acquired immune deficiency syndrome (AIDS)-related symptom complex (ARC), and 33 of whom had AIDS with Kaposi's sarcoma, opportunistic infection, or both. Of 38 laboratory parameters, 11 were significantly different than controls in the SF patients, 19 in the ARC patients, and 20 in the AIDS patients. In SF patients, delayed hypersensitivity was significantly suppressed for 6 of 12 recall antigens. In addition, the percentage of circulating lymphocytes, the percentage of T3+ cells, the percentage and absolute number of T4+ cells, the T4/T8 ratio, the blastogenic responses to phytohemagglutinin, pokeweed mitogen, and concanavalin A were depressed significantly in this group. In contrast, the percentage and absolute granulocyte count, the serum lysozyme, and the serum thymosin alpha 1 were significantly elevated in these patients. In patients with more advanced disease (ARC and AIDS), immunological and hematological parameters tended to worsen. Thus, in the AIDS patients the white blood cell count, percentage, and absolute T11+ cells, absolute T3+ cells, percentage of T4+ cells and absolute level of B-cells, as well as the monocyte adherence and delayed hypersensitivity responses to 12 of 12 recall antigens were depressed. Serum levels of thymosin alpha 1 were equally elevated in all three groups. Serum interferon was found in 15 of 18 opportunistic infection patients with or without Kaposi's sarcoma, in 3 of 9 Kaposi's sarcoma patients without opportunistic infection, but in none of the ARC or SF patients. This study has demonstrated that SF sexually active homosexuals have a characteristic pattern of immune deficiency and that immunodeficiency worsens as one compares SF to ARC to AIDS patients. The study has provided a data base for the development of prognostic criteria and for characterization and evaluation of immunorestorative and immunomodulatory therapy.
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PMID:Immunological characterizations of patients with acquired immune deficiency syndrome, acquired immune deficiency syndrome-related symptom complex, and a related life-style. 620 6

Homosexual patients who mainly had the prodrome of the syndrome of opportunistic infection and Kaposi's sarcoma were studied immunologically. Patients showed diminished delayed hypersensitivity to recall antigens, diminished lymphocyte blastogenic responses, a suppressor cell for lymphocyte proliferative responses, low helper cells and an inverted helper:suppressor ratio. The patients had low levels of adherent monocytes. NK cell activity and antibody dependent cellular cytotoxicity were normal. Virtually all patients showed elevated serum thymosin alpha 1 levels and elevated serum lysozyme levels. The most consistent findings were the low helper cells, inverted helper:suppressor ratio and elevated serum thymosin alpha 1 and lysozyme. The patients with the prodrome should be subjected to therapeutic research with immunorestorative drugs.
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PMID:Immunological studies of male homosexuals with the prodrome of the acquired immunodeficiency syndrome (AIDS). 660 4