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)

Clinically, malignant histiocytosis is a malignant neoplasia with poor prognosis. Diseased are lymphnodes (especially cervical nodes), liver, spleen and bones. Few cases become leukemic. The cells show characteristic pale roundish, often indented nuclei, without large nucleoli and with abundant ill-defined cytoplasm. Phagocytosis of erythrocytes and leukocytes, as well as, hemosiderin deposits may serve as indicators for histiocytic, respectively macrophagic qualities. On touch preparation, tumor cells previously had been marked by acid phosphatase and non-spevific esterase, as being histiocytic. - A comparable marking could be carried out on paraffin embedded material with lysozyme (muramidase) and alpha1-antichymotrypsin, by the indirect immuno-peroxidase technique. No correlation could be proven between any special shape of tumor cells or between different grades of cellular atypism and presence or absence of the immunohistochemical reaction. The reaction with lysozyme and alpha1-antichymotrypsin was also tested in other tumors and was found to be positive in a variety of different tumor cells showing degenerative changes, respectively necrobiosis. - But lysozyme and alpha1-antichymotrypsin are markers characteristically found in histiocytes, respectively histiocytic tumor cells. They are apparently less distinct in MH with a larger number of immature histiocytic tumor cells.
 ...
PMID:Malignant histiocytosis. Immunohistochemical characterization on paraffin embedded tissue. 735 72

We report an autopsy case of true malignant histiocytosis that developed during chemotherapy for mediastinal immature teratoma. The patient was a 14-year-old boy who exhibited hepatosplenomegaly while receiving chemotherapy for a mediastinal immature teratoma that had been resected 11 months before. The spleen and liver of the excisional biopsy displayed infiltration of multinucleated giant atypical cells with prominent erythrophagia in massive aggregations. These atypical cells expressed CD68, alpha1-antitrypsin, alpha1-antichymotrypsin, lysozyme, and vimentin, suggesting that the tumor cells may have been derived from macrophages. Immunocytochemistry showed p53 expression in the tumor cells of the malignant histiocytosis, as well as in the elements of the immature teratoma. Direct sequence analysis showed the p53 mutation in the tumor cells of the immature teratoma to be a mutation at codon 175 (exon 5), whereas the mutation in the malignant histiocytosis occurred at codon 285 (exon 8), ie, polyclonality was exhibited and these features suggested that the malignant histiocytosis arose independently from the immature teratoma during the chemotherapy.
 ...
PMID:True malignant histiocytosis developed during chemotherapy for mediastinal immature teratoma. 889 99

By immunoperoxidase analysis for types I to VI collagen, elastin, cytoskeletal components and some glycoproteins, we found type VI collagen immunoreactivity in amorphous eosinophilic deposits (skeinoid fibers) in three small intestinal stromal tumors. Negative results were obtained for types I, II, III, IV and V collagen, elastin, laminin, ubiquitin, intracellular filaments such as actin, desmin, vimentin, calponin and caldesmon, and glycoprotein such as lysozyme, factor XIIIa, beta2-microglobulin, alpha1-antitrypsin and alpha1-antichymotrypsin. In two lesions, the periodic acid-Schiff-positive skeinoid fibers were also focally labeled for amyloid P component.
 ...
PMID:Type VI collagen immunoreactivity in skeinoid fibers in small intestinal stromal tumors. 1050 58

We describe a widespread papular eruption in a 5-year-old girl with rheumatic fever. Histological examination revealed a dense histiocytic infiltration in the dermis. On immunohistochemical studies, the cells were positive for vimentin, CD68, MAC387, alpha1-antichymotrypsin and lysozyme, but negative for CD1a and S-100 protein. Electron microscopic studies showed no Birbeck granules in their cytoplasm. A diagnosis of generalized eruptive histiocytoma of childhood was established. The skin lesions completely disappeared within 8 months.
 ...
PMID:Generalized eruptive histiocytoma of childhood associated with rheumatic fever. 1052 34

With future exploration of macrophage properties in mind, we established a novel cell line (HS-P) from a transplantable histiocytic sarcoma, derived originally from a tumour in an aged F344 rat. HS-P was subjected to 70 serial passages, in which the mean doubling time was 15.7 h. The cells, which were round, oval or polygonal in shape, were arranged in a compact sheet. They reacted to varying degrees for lysosomal enzymes (acid phosphatase and non-specific esterase) and with the following antibodies: ED1/ED2 (rat macrophage/histiocyte-specific), OX6 (rat MHC class II-specific), lysozyme antibody and alpha1-antichymotrypsin antibody. Electron microscopically, HS-P cells showed lysosomes and prominent cell projections. These findings indicated that the cultured cells were macrophage-like. Syngeneic rats inoculated subcutaneously or intraperitoneally with HS-P cells invariably developed sarcomatous tumours consisting of monomorphic mononuclear cells, which exhibited cytochemical properties similar to those of cultured HS-P cells. Bioassay and reverse transcription-polymerase chain reaction methods revealed that tumour necrosis factor-alpha increased on addition of lipopolysaccharide (LPS), indicating that HS-P cells remained LPS-responsive. HS-P cells may prove to be a useful tool for in-vitro studies of macrophage function.
 ...
PMID:Macrophage-like cell line (HS-P) from a rat histiocytic sarcoma. 1122 16

We report here an autopsy case of true malignant histiocytosis. The patient was a 67-year-old woman who exhibited fever, wasting, hepatosplenomegaly, and progressive pancytopenia. The bone marrow aspiration disclosed hemophagocytosing cells, which resembled histiocytes. The molecular analysis did not show the clonal gene rearrangement of T-cell receptor or immunoglobulin heavy chain. Although the patient had been started on methylprednisolone pulse therapy and chemotherapy with etoposide, she died from cerebral hemorrhage. The autopsy specimens of spleen and liver showed extensive infiltration of atypical cells, for which histiocytic origin was identified with an immunohistochemical method using monoclonal antibodies against CD11c, CD68, macrophage colony-stimulating factor (M-CSF), M-CSF receptor, lysozyme, antitrypsin and alpha1-antichymotrypsin. Recent investigations have disclosed that in most cases diagnosed as malignant histiocytosis, hemophagocytosis was reactive and not evoked by histiocytic malignancy. True malignant histiocytosis, for which histiocytic origin is confirmed, is extremely rare.
 ...
PMID:A case of true malignant histiocytosis: identification of histiocytic origin with use of immunohistochemical and immunocytogenetic methods. 1202 39

Purely cutaneous Rosai-Dorfman disease is exceptional. The disease is characterized histologically by large, proliferating histiocytes exhibiting inflammatory cells within their cytoplasm (emperipolesis). We present here a case of purely cutaneous generalized disease in which the routine histopathology was suggestive of an inflammatory pseudotumor. Positivity for S-100 protein, alpha1-antitrypsin, alpha1-antichymotrypsin, lysozyme, Mac387 and CD68 proteins, and negativity for CD1a protein confirmed the diagnosis of Rosai-Dorfman disease. The rarity of this case lies in the presence of conspicuous inflammatory pseudotumor-like histopathologic changes, masking an otherwise typical sinus histiocytosis cell infiltrate. This unusual presentation of the disease requires a high index of suspicion by clinicians and pathologists.
 ...
PMID:Cutaneous Rosai-Dorfman disease: histopathological presentation as inflammatory pseudotumor. A literature review. 1236 Nov 36

A 6-year-old male Pointer dog was presented with a 4-week history of progressive hind-limb stiffness. Magnetic resonance imaging demonstrated a focal intramedullary lesion at T1 level with a pattern of ring contrast enhancement. At necropsy, a circumscribed intramedullary reddish-gray tumor was observed. Microscopically, the tumor was composed of thin-walled capillaries lined by endothelial cells and separated by pleomorphic cells (stromal cells) with a moderate degree of anisokaryosis. Immunohistochemically, the endothelial cells were positive for factor VIII-related antigen and the stromal cells were positive for neuron-specific enolase and vimentin. GFAP-positive astrocytes were occasionally observed within the tumor. Both endothelial and stromal cells were negative for synaptophysin, S-100 protein, pankeratin, smooth muscle actin, CD34, CD68, alpha1-antichymotrypsin, and lysozyme. The tumor showed considerable morphologic and immunohistochemical similarities with human hemangioblastoma, and hence the inclusion of this tumor type within the primary neoplasms of the canine central nervous system is suggested.
 ...
PMID:Intramedullary hemangioblastoma in a dog. 1262 18

Vulvar carcinoma is the fourth most frequently encountered malignancy of the female reproductive tract. Among vulvar neoplasms, 0.1% to 5% are of Bartholin gland origin. Primary adenoid cystic carcinoma of the Bartholin gland is very rare. To date, only about 60 cases have been reported in the world literature. Microscopic examination reveals a neoplasm of cribriform pattern composed of nests and columns of cells of bland appearance arranged concentrically around glandlike spaces filled with eosinophilic periodic acid-Schiff-positive diastase-resistant material. Immunohistochemically, the tumor cells express low-molecular-weight keratins, carcinoembryonic antigen, lysozyme, alpha1-antichymotrypsin, S100, and type IV collagen. Adenoid cystic carcinoma of the Bartholin gland is a slow-growing but locally very aggressive neoplasm with high capacity for recurrence. Perineural and lymphatic invasion is characteristic of this tumor and may explain its propensity for causing pain and recurrence. The treatment may range from simple local excision to radical vulvectomy, with or without partial to complete regional lymphadenectomy.
 ...
PMID:Adenoid cystic carcinoma of the Bartholin gland: an overview. 1748 69

Malignant histiocytosis is a rare neoplasm of the reticuloendothelial system characterized by neoplastic proliferation of tissue histiocytes. We report a case of malignant histiocytosis in a 64-year-old female initially operated on for a mucinous cystadenoma of her liver. Four months after the operation, skin induration on the neck and anterior thoracic wall and systemic lymphadenopathy were noted. Histology and immunohistochemistry of the lymph node and bone marrow specimens showed extensive infiltration with atypical cells, resembling malignant histiocytes (CD45, CD45RO, CD11c, CD68, lysozyme, antitrypsin and alpha1-antichymotrypsin positive; CD1, CD35, B-cell and T-cells markers negative). She was treated with vinblastine, methotrexate and dexamethasone (3 cycles) without response. The therapy was switched to CHOP (cyclophosphamide, vincristine, doxorubicin, and prednisone) with disappearance of lymphadenopathy. Bone marrow infiltration by histiocytes was reduced to 20%. Two months after completion of 8 cycles of CHOP she experienced severe headaches, vomiting, loss of consciousness, and developed paraparesis. A CT scan of the brain was normal but the cerebrospinal fluid cytology showed presence of histiocytes. The patient was then treated with intrathecal methotrexate, prednisolone and cytosine-arabinoside and systemic chemotherapy with etoposide and cyclophosphamide. Her condition improved, she became conscious, her headache diminished, she became mobile but skin and nodal lesions reappeared along with extensive marrow histiocytic infiltration. She finally died 22 months after diagnosis.
 ...
PMID:Malignant histiocytosis with central nervous system involvement and hepatic mucinous cystadenoma in a single patient with review of the literature. 1806 14


1