Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0023418 (leukemia)
 93,477 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The lymphocyte differentiation antigens detected by rabbit antisera to rat thymocytes and leukaemic cells have been investigated. Thy-1 was the only such antigen detected by the anti-thymocyte serum, which was predominately directed to two xenoantigenic determinants rather than the Thy-1.1 determinant on this molecule. Two additional antigens were recognized by the anti-leukaemia serum. One of these was found on thymocytes and peripheral lymphocytes, but only on 1 per cent of bone marrow cells. The other was found not only on lymphocytes, but also on the nucleated myeloid and erythroid cells of bone marrow.
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PMID:Rat lymphocyte differentiation antigens detected by rabbit antiserum to thymocytes and leukaemic cells. 7 37

BALB/c x-ray-induced leukemia RL male 1 is strongly immunogenic for (BALB/c x C57BL/6)F1 mice. Transplants of RL male 1 regressed after initial growth, and after tumor regression mice could resist repeated inocula of 10(7) RL male 1 cells. Spleen cells from immunized mice after in vitro stimulation with RL male 1 were cytotoxic for RL male 1 cells in 3-hr 51Cr assays. Pretreatment of immune spleen cells with Thy-1, Lyt-2, or Lyt-3 antisera and complement eliminated cytotoxic activity, indicating that effector cells for RL male 1 lysis are T cells. Tests with other target cells showed little or no cytotoxicity. Analysis of the specificity of T-cell killing of RL male 1 by competitive inhibition assays with unlabeled cells indicated that only RL male 1 could inhibit killing; other BALB/c tumors (13 x-ray or murine leukemia virus-induced leukemias and three myelomas) failed to inhibit lysis of RL male 1. A range of alloantisera and heteroantisera were tested for their capacity to block lytic activity in the absence of added complement. H-2d antisera and Lyt-2 and -3 antisera blocked lysis, the latter at the level of the effector cell. Antisera to other cell surface alloantigens, murine leukemia virus-related antigens, and immunoglobulins did not block RL male 1 lysis. Thus, T cells from mice immunized against RL male 1 recognize an individually distinct or unique antigen that does not appear to be related to any of the serologically defined cell surface determinants of RL male 1. In its restriction to a single leukemia, the RL male 1 antigen resembles the individually distinct antigens of chemically induced tumors and other tumor types of rodents.
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PMID:Definition of a unique cell surface antigen of mouse leukemia RL male 1 by cell-mediated cytotoxicity. 9 Nov 66

A somatic hybrid of ASL-1 leukemia cells [H-2a, thymus leukemia (TL)1,2,3, Thy-1b] and LM(TK)-cells [H-2-k, TL(-), Thy-1 (-), thymidine kinase deficient] was formed with the aid of inactivated Sendai virus. The selection of hybrid cell clones was facilitated by the inability of ASL-1 cells to grow in vitro and of LM(TK)-cells to survive in hypoxanthine/amethopterin/thymidine medium. The H-2 antigens of both parental cells were formed in approximately equivalent amounts by the hybrid cells, and they possessed a hybrid karyotype. As determined by five independent experimental procedures (antibody and complement-mediated cytotoxicity tests, the reduction of specific antibody activity of antiserum of known titer, immunofluorescent tests, mixed hemagglutination tests, and their direct isolation), TL antigens but not Thy-1 antigens were formed by the hybrid cells. TL antigens of the hybrids failed to undergo modulation under conditions leading to the modulation of TL antigens of parental ASL-1 cells. Modulation was attempted with TL 1,3, TL 2, or TL 1,2,3 antisera of high titer. thybrid cells were incubated for up to 30 hr in medium with TL antisera. Both direct and indirect immune methods were attempted. These results indicate that cellular mechanisms controlling the expression of TL antigens may be distinguished from the capacity of the cells to undergo modulation.
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PMID:Somatic hybrid of thymus leukemia (. 16 80

Thymocytes from preleukemic AKR mice aged 5-6 mo have an altered pattern of cell surface antigens. The expression of four MuLV-related antigens on the cell surface (GIX, GCSA, gp70, p30) is markedly increased in comparison to 2-mo-old AKR mice and approximates the heightened levels of these antigens found on thymic leukemia cells. H-2 and Thy-1 alloantigens also show characteristic modifications in relation to age and leukemia development. In contrast to the high Thy-1/low H-2 levels on 2-mo-old AKR thymocytes, thymocytes from 6-mo-old mice and thymic leukemia cells frequently show a low Thy-1/high H-2 surface phenotype. As thymocytes from mouse strains with a low incidence of leukemia do not show these changes, they appear to represent a stage in the conversion of normal cells to leukemia cells.
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PMID:Age-related changes in cell surface antigens of preleukemic AKR thymocytes. 18 Feb 29

Ia8, a cell membrane antigen controlled by gene(s) located in the I region of the H-2 complex, was found on 9 of 26 murine leukemia cell lines. Iaddition, 3 of the 9 Ia8-bearing lines had a membrane receptor for antigen-antibody-complement complexes. Six of 26 lines bore the Thy-1.2 antigen. Ia8 and Thy-1.2 antigens were mutually exclusive on the cell lines studied. The strain of virus used to induce the leukemia, the H-2 type of the cells, and the techniques of leukemia cell propagation all appeared to influence the antigenic characteristics of the cell lines obtained. Production of infectious murine leukemia virus in vitro and expression of leukemia virus-induced membrane antigens did not appear to correlate with the presence of I8 or Thy-1.2 antigens or with the H-2 type of the cells.
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PMID:Characterization of Ia8 antigen, thy-1.2 antigen, complement receptors, and virus production in a group of murine virus-induced leukemia cell lines. 18 95

Mice were inoculated with either the lymphatic leukemia virus associated with Friend and Rauscher viruses or with the Graffi or BALB/Tennant leukemia viruses. A total of 48 leukemic mice were examined histologically and by immunofluorescence. All four viruses induced a histologically similar disease that particularly involved tha thymus-dependent lymphoid regions. Lymphocytes from the spleens and thymuses of leukemic animals were examined for Thy-1 antigen and immunoglobulins on the cell surface; all the leukemias were composed of T- cells and/or nonreactive cells lacking both the Thy-1 antigen and immunoglobulins. By immunofluorescence, the spleen and thymus from the same leukemic animal frequently showed different cell-surface markers, though no morphologic differences were seen in leukemias involving the different classes of lymphocytes.
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PMID:Immunofluorescence and histologic studies of virus-induced murine lymphocytic leukemias. 18 13

As background for a serological definition of the unique antigens of chemically induced sarcomas, we have typed a series of fibroblast and sarcoma cell lines of BALB/c and C57BL/6 origin by cytoxicity and absorption tests for murine leukemia virus (MuLV)-related cell surface antigens and known alloantigens. 7 of the 17 cultured lines expressed the range of cell surface antigens associated with MuLV (GIX, GCSA, gp70, p30), and this was invariably associated with MuLV production. In nonproducer lines of C57BL/6 (but not BALB/c) origin, a MuLV-gp70-like molecule was found on the surface of fibroblasts and sarcoma cells. The alloantigenic phenotype of these MuLV+ and MuLV- cell lines was H-2D+, H-2K+, Thy-1.2+ or -, PC.1+ or -, Lyt-1.2-, Lyt-2.2-, Ia.7-, and TL.2-. A unique antigen was defined on the BALB/c ascites sarcoma Meth A with antisera prepared in BALB/c or (BALB/c X C57BL/6)F1 mice. Tissue culture lines derived from this tumor were MuLV-, which facilitated serological study of the antigen. Absorption analysis indicated that the antigen was restricted to Meth A; it could not be detected in normal or fetal BALB/c tissue MuLV+ or MuLV- fibroblast lines, 12 syngeneic or allogeneic sarcomas, or normal lymphoid cells from 13 different inbred mouse strains.
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PMID:Cell surface antigens of chemically induced sarcomas of the mouse. I. Murine leukemia virus-related antigens and alloantigens on cultured fibroblasts and sarcoma cells: description of a unique antigen on BALB/c Meth A sarcoma. 19 92

Mycoplasma hyorhinis, isolated by isopycnic centrifugation from supernatants of a persistently infected murine T lymphoblastoid cell line, demonstrated the presence of the Thy-1.1 differentiation alloantigen and H-2Kk histocompatibility antigens. The murine leukemia virus-related gp70 antigen also present on the surface of these lymphoblastoid cells was absent from mycoplasma preparations. Quantitative assessment of Thy-1.1 present in preparations of M. hyorhinis revealed a specific activity greater or equal to that of membrane preparations from lymphoblastoid cells, suggesting a marked accumulation of this T lymphoblastoid cells, suggesting a marked accumulation of this T lymphocyte antigen by membrane-associated mycoplasmas. The accumulation of the Thy-1.1 antigen in association with purified mycoplasmas was also demonstrated in lymphoblastoid cells experimentally infected with a defined culture of M. hyorhinis.
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PMID:Selective association of murine T lymphoblastoid cell surface alloantigens with Mycoplasma hyorhinis. 21 54

We report the development of extrathymic lymphoblastic lymphomas in RadLV-inoculated congenitally athymic nude mice. Thus, a leukemogenic virus which appears to require the presence of a thymus for its replication in normothymic mice can infect and transform target cells in the absence of this organ in the athymic host. The cells of one of these lymphomas have been established in vitro as a permanent cell line, BALB/Nu1. This cell line as well as a lymphoma induced in NIH/Swiss nude mice exhibit several T-cell markers, including terminal deoxynucleotidyl transferase activity, Thy-1.2, and Ly-2.2, but not Ly-1.2 nor TL. Ig determinants were not detected. The characteristics of the tumor cells support the view that cells with T-cell markers may normally exist in nude mice and undergo neoplastic transformation and clonal expansion after infection with a leukemogenic virus. The alternative possibility that virus-induced differentiation of prothymocytes may lead to the expression of Thy-1.2 and Ly-2.2 antigens is also considered. BALB/Nu1 cells release large numbers of type C viral particles. The virus, designated radiation leukemia virus (RadLV)/Nu1, has RTase activity and the protein profile characteristic of murine leukemia virus (MuLV). In radioimmunoassays, it cross-reacts completely with RadLV/VL3, a virus obtained from RadLV-induced C57BL/Ka thymic lymphoma cells in culture, and slightly with a xenotropic virus (BALB:virus-2) and with AKR MuLV. On inoculation into C57BL/Ka mice it has thymotropic and leukemogenic activity. In vitro it is B-tropic, poorly fibrotropic, and has limited xenotropic activity. Thus, RadLV/Nu1 appears to be biologically and serologically similar or identical to its parent virus, RadLV.
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PMID:T-cell lymphoma induction by radiation leukemia virus in athymic nude mice. 21 7

Three lines of rat leukemia, DBLA-1, -6, and -9, were studied serologically by complement-dependent cytotoxicity test. DBLA-1, -6, and -9 were killed by anti-lymphocyte sera, anti-Thy-1.1 sera, and rabbit anti-rat brain sera absorbed with AKR/J brain. However, anti-T and anti-B lymphocyte sera had no cytotoxic effect on DBLA-1, -6, and -9. Furthermore, DBLA-6 and -9 did not absorb the cytotoxic activity of anti-T serum on thymocytes, while DBLA-1 slightly absorbed the cytotoxic activity. These results indicate that DBLA-1, -6, and -9 are of lymphoid origin and possess rat Thy-1 antigens, but lack mature T-lymphocyte antigens. On the other hand, peroxidase-positive myelogenous leukemia L1005 failed to react with any of the antisera used.
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PMID:Serological characterization of rat leukemia lines, DBLA-1, -6, and -9. 31 51


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