Cell-surface antigens of murine sarcoma-virus-transformed non-producer cells: Further evidence for lack of transplantation immunity

Adult AKR and C58 mice injected intramuscularly with murine sarcoma virus, Moloney isolate (M-MSV), developed high incidence of nonregressing local tumors. Histologically, these tumors revealed the typical pleomorphism of M-MSV sarcomas; in some cases, however, neoplastic tissue showed a nodular or diffuse growth of monomorphic myoblastlike cells, reminiscent of clonal aggregates. No depression of immune reactivity was found in M-MSV-injected mice as evaluated by direct hemolytic plaque-forming cells against SRBC and by virus-neutralizing antibody production. The MSV recovered from the induced tumors proved to be, by neutralization assay, a Gross (G)-MSV pseudotype. Moreover, tumor cell suspensions absorbed out cytotoxic antibody directed against G-cell surface antigens. Therefore, the conclusion was drawn that MSV with envelope characteristics of endogenous G leukemia virus had formed in vivo through a phenotypic mixing phenomenon. The failure of tumors to regress has been interpreted as mainly due to the partial unresponsiveness of host immune reactivity towards G-MuLV specified antigens. Since MSV-tumors arose in AKR mice after a very long latent period, the possibility was considered that this relative resistance might depend on immunologic mechanisms. In fact, M-MSV-injected AKR mice immunodepressed by goat antimouse lymphocyte serum or rendered partially tolerant by neonatal M-MuLV inoculation developed sarcomas with higher incidence and with a shorter latency. Furthermore, the MSV recovered from these early tumors proved to be the original Moloney pseudotype.

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Independent Expression of Common and Private Tumor-Specific Cell Surface Antigens in Somatic Cell Hybrids Between Rous Sarcoma Virus-Transformed and Normal Cells2

JNCI Journal of the National Cancer Institute ◽

10.1093/jnci/72.2.387 ◽

1984 ◽

Keyword(s):

Cell Surface ◽

Rous Sarcoma Virus ◽

Surface Antigens ◽

Specific Cell ◽

Somatic Cell Hybrids ◽

Cell Surface Antigens ◽

Normal Cells ◽

Rous Sarcoma ◽

Sarcoma Virus ◽

Specific Cell Surface

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Cell surface antigens of murine leukemias induced by radiation leukemia virus. Recognition of individually distinct cell surface antigens by cytotoxic T cells on leukemias expressing crossreactive transplantation antigens.

Journal of Experimental Medicine ◽

10.1084/jem.163.2.452 ◽

1986 ◽

Vol 163 (2) ◽

pp. 452-457 ◽

Cited By ~ 9

Author(s):

H Morishita ◽

H Shiku ◽

K Horibe ◽

Y Obata ◽

E Stockert ◽

...

Keyword(s):

T Cells ◽

Cell Surface ◽

Tumor Regression ◽

Leukemia Virus ◽

Surface Antigens ◽

Cytotoxic Lymphocytes ◽

Transplantation Immunity ◽

Cell Surface Antigens ◽

Radiation Induced

The specificity of transplantation immunity and T cell cytotoxicity against leukemias induced by RadLV was examined. Subcutaneous inoculation of two RadLV leukemias induced in BALB/c mice, BALBRVB and BALBRVD, resulted in initial tumor growth in CB6F1 mice, followed by complete tumor regression. Mice that had rejected leukemias BALBRVB or BALBRVD were subsequently challenged with various tumors of BALB/c origin. The growth of all five RadLV leukemias tested, and of one radiation-induced leukemia, was significantly inhibited. Another radiation-induced leukemia, a methylcholanthrene-induced sarcoma, and a leukemia induced by the Moloney leukemia virus, were not inhibited. The results indicate that RadLV leukemias share cell surface antigens that induce transplantation immunity in vivo. Cytotoxic lymphocytes were generated by coculturing spleen cells from mice that had rejected leukemia BALBRVB or BALBRVD with the corresponding leukemia cells. Direct tests and inhibition tests showed that such cytotoxic cells recognized individually specific antigens on leukemias BALBRVB and BALBRVD, distinct from the shared antigens detected in transplantation experiments. The effector cells in cytotoxicity assays were Thy-1+, Lyt-1+,-, Lyt-2+, and Lyt-3+ T cells.

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A pre-embedding, protein a-gold immunolabelling technique for cytocentrifuged cell monolayers for lm and tem

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100142724 ◽

1986 ◽

Vol 44 ◽

pp. 220-221

Author(s):

K. Chien ◽

I.P. Shintaku ◽

A.F. Sassoon ◽

R.L. Van de Velde ◽

R. Heusser

Keyword(s):

Cell Surface ◽

Staining Method ◽

Protein A ◽

Surface Antigens ◽

Cell Suspensions ◽

Cellular Morphology ◽

Cellular Phenotype ◽

Cell Surface Antigens ◽

Cell Monolayers ◽

Diagnostic Histopathology

Identification of cellular phenotype by cell surface antigens in conjunction with ultrastructural analysis of cellular morphology can be a useful tool in the study of biologic processes as well as in diagnostic histopathology. In this abstract, we describe a simple pre-embedding, protein A-gold staining method which is designed for cell suspensions combining the handling convenience of slide-mounted cell monolayers and the ability to evaluate specimen staining specificity prior to EM embedding.

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