title: C3H/HeN mammary tumor-bearing mice develop type-specific neutralizing antibodies and group-specific precipitating antibodies for the mouse mammary tumor virus.
abstract: The development of mouse mammary tumor virus (MMTV)-neutralizing antibodies in various strains of mice was measured by their ability to neutralize the focus-forming capacity of a Kirsten sarcoma virus (C3H MMTV) pseudotype containing the MMTV envelope glycoprotein gp52. C3H/HeN, but not GR/N and RIII, mammary tumor-bearing mice were found to develop neutralizing antibodies to this pseudotype. In addition, non-tumor-bearing C3H/HeN, GR/N, RIII, NIH Swiss, C57BL/6, and BALB/c mice and 13 feral mice were also negative for neutralizing antibodies. The neutralization was immunoglobulin G mediated, and the antibodies of C3H/HeN mammary tumor-bearing mice were type specific and capable of distinguishing C3H and GR/N MMTVs from RIII and C3H/HeNf MMTVs. Precipitating antibodies were detected in sera from RIII and GR/N tumor-bearing mice, GR/N non-tumor-bearing mice, and six of the feral mice, although these same sera did not neutralize the Kirsten sarcoma virus (C3H MMTV) pseudotype. The results of this study and of a previous study demonstrate that C3H/HeN mammary tumor-bearing mice develop three functionally distinct antibody populations: (i) group-specific virus-precipitating antibodies; (ii) type-specific virus-neutralizing antibodies; and (iii) type-specific cytotoxic antibodies.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis*; D000939:Epitopes; D006023:Glycoproteins / Q000276:immunology; D006824:Hybridization, Genetic; D007074:Immunoglobulin G / Q000096:biosynthesis; D007708:Kirsten murine sarcoma virus / Q000235:genetics; D008325:Mammary Neoplasms, Experimental / Q000276:immunology*; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D009500:Neutralization Tests; D013045:Species Specificity; D014764:Viral Proteins / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D000939:Epitopes; D006023:Glycoproteins; D007074:Immunoglobulin G; D014764:Viral Proteins