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Reduced ecto-5'-nucleotidase activity and enhanced OKT10 and HLA-DR expression on CD8 (T suppressor/cytotoxic) lymphocytes in the acquired immune deficiency syndrome: evidence of CD8 cell immaturity.

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Markedly reduced ecto-5'-nucleotidase activity was found in peripheral blood lymphocytes from 27 out of 30 homosexual men with the acquired immune deficiency syndrome (AIDS) in association with Kaposi's sarcoma (AIDS-KS; 2.67 +/- 1.70 U/10(6) cells; n = 13), opportunistic infections (AIDS-OI; 9.29

Conversion of dNTP to dNMP dependent on DNA synthesis in isolated Yoshida sarcoma nuclei.

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Nuclei isolated from Yoshida sarcoma cells had activity for conversion of dGTP dependent on DNA synthesis. The ratio of nucleotide generation/generation + incorporation was 0.4 +/0- 0.1, indicating that approx. 40% of the incorporated dGMP was excised. Two lines of evidence indicated the dependence

Malignant lymphoma of true histiocytic origin: histiocytic sarcoma. A morphological, ultrastructural, immunological, cytochemical and clinical study of 10 cases.

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Ten tumors of true histiocytic origin (Histiocytic Sarcoma) are presented. The tumor cells were identified as histiocytes by immunological, cytochemical and ultrastructural criteria (cytoplasmic lysozyme activity, presence of C3 and Fc gamma receptor, strong acid phosphatase and alpha-naphthyl

Adenosine triphosphatase activity of crystalline inclusions in alveolar soft part sarcoma. An ultrahistochemical study of a case.

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A case of alveolar soft part sarcoma was studied by light and electron microscopy and by electron microscopic enzyme histochemistry of adenosine triphosphatase (ATPase) and 5'nucleotidase(5'Nase). The tumor showed distinct alveolar pattern and diastase resistant PAS positive crystalline inclusions

Origin of increased deoxycytidine excretion into urine of rats bearing Yoshida ascites sarcoma.

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The metabolism of deoxycytidine (dCyd) and dCyd nucleotides in Yoshida ascites sarcoma (YS) cells and the host rat liver was investigated with reference to the increased excretion of urinary dCyd. Incorporation of [14C]orotic acid into the livers of rats at the fifth day after the transplantation of

Epithelioid sarcoma. Enzyme histochemical and ultrastructural study.

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A case of epithelioid sarcoma was studied by electron microscopy and by light and electron microscopic enzyme histochemistry comparing with several control soft tissues. In addition to previously reported ultrastructural features, such as abundant 10 nm cytoplasmic filaments, desmosome-like cell

A new 5'-nucleotidase inhibitor, nucleoticidin. I. Taxonomy, fermentation, isolation and biological properties.

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A new 5'-nucleotidase inhibitor named nucleoticidin was produced by Pseudomonas sp. YM-3229G. It was isolated from a fermentation broth by trichloroacetic acid extraction, ethanol precipitation and Dowex 1 and DEAE-52 column chromatography. It inhibited 5'-nucleotidase activity of snake venom and

Evidence for the origin of Kaposi's sarcoma from lymphatic endothelium.

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Previous studies utilizing enzyme histochemistry, electron microscopy, and immunohistochemistry have failed to establish the cell of origin in Kaposi's sarcoma. The authors have rigorously tested the prevailing hypothesis that the lesion defined as Kaposi's sarcoma is derived from vascular

[Activity of 5'-nucleotidase from thymus and tumors upon administering bradykinin to tumor-bearing mice].

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Activity of 5'-nucleotidase was inhibited in thymus tissue of tumor-bearing mice; bradykinin (1 mg/kg body weight) increased the enzymatic activity 2.0-2.2-fold. Administration of bradykinin led to inhibition of allogenic Crocker's sarcoma growth and to stimulation of syngeneic mastocytoma P-815

Effect of 5'-nucleotidase inhibitors on mouse immune system and experimental murine tumors.

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Nucleoticidin and melanocidins A and B exhibited potent inhibitory activity against 5'-nucleotidases from rat liver membrane and snake venom. Nucleoticidin retarded growth of Sarcoma 180 solid tumor, and melanocidins A and B prolonged the survival period of mice bearing B16 melanoma. These

Decreased 5' nucleotidase activity in lymphocytes from asymptomatic sexually active homosexual men and patients with the acquired immune deficiency syndrome.

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5' Nucleotidase (5'NT) is an ectoenzyme associated with the plasma membrane of most mammalian cells. Low 5'NT activity has been observed in peripheral blood lymphocytes from patients with immunodeficiency states. 5'NT activity was measured in null and T-enriched lymphocytes from asymptomatic

Immunophenotypic analysis of neoplastic cells in follicular dendritic cell sarcoma.

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The existence of a sarcoma derived from the antigen-presenting follicular dendritic cells (FDCs) has been assumed but never confirmed. This report describes a tumor from axillary lymph nodes of a 39-year-old male in which the morphologic, enzyme histochemical, and immune phenotypic data are

Histiocytic sarcoma (true histiocytic lymphoma): a clinicopathological study of 20 cases.

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Large-cell non-Hodgkin's lymphomas (T- and B-immunoblastic, centroblastic and true histiocytic lymphomas) have a heterogeneous clinical course. In the present study the clinical and morphological data of 20 cases of histiocytic sarcoma (true histiocytic lymphoma) are presented. Diagnosis was

Effect of cisplatin on the plasma membrane phosphatase activities in ascites sarcoma-180 cells: a cytochemical study.

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To study the effects of cisplatin [cis-dichlorodiammine-platinum (II)] on tumor cells in the presence or absence of the immune system, animals with ascites sarcoma-180 tumor burden were treated with therapeutic dose levels (9 mg/kg). Similarly, ascites sarcoma-180 cells were maintained in tissue

CD39 is a promising therapeutic antibody target for the treatment of soft tissue sarcoma.

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Soft tissue sarcoma (STS) is a heterogenous tumor arising from the embryonic mesoderm represented by approximately 50 histological subtypes. Effective therapeutic intervention is lacking for recurrent, late stage and metastatic disease. CD39, a cell-surface ectonucleotidase, has previously been

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