Immunological characterization of mouse mammary tumor virus p10 and its presence in mammary tumors and sera of tumor-bearing mice.

AUTOR(ES)

Arthur, L O

RESUMO

Mouse mammary tumor virus (MMTV) p10 and gp52 were purified and used as radiolabeled antigens in sensitive radioimmunoassays. These radioimmunoassays were specific for MMTV proteins since detergent-disrupted MMTV from C3H/HeN, RIII, and GR/N mice gave complete competition, whereas C3H/HeNf liver extracts and other lysed retroviruses did not. Both gp52 and p10 are coded by the viral genome, since MMTV grown in a heterologous cell line (feline kidney cells) competed in these assays. Sera from mammary tumor-bearing mice and mammary tumors from C3H/HeN and C3H/HeNf mice competed in both the gp52 and the p10 assays. Although these radioimmunoassays detected predominantly group-specific antigenic determinants in C3H/HeN and C3H/HeNf tumor extracts, type specificity was also found with gp52. Absorption of the anti-MMTV serum with C3H/HeNf tumor extracts removed all antibodies directed against p10 and decreased the anti-gp52 titer approximately 30-fold. When this absorbed antiserum was used at limiting dilution in the gp52 radioimmunoassay, C3H/HeN tumor extracts gave complete competition, whereas no competition was found with C3H/HeNf tumor extracts.

Documentos Relacionados

• Virus-specific cytotoxic activity to mammary tumor cells of sera from normal and tumor-bearing mice with inhibition at low dilutions.
• Increased translocation of bacteria from the gastrointestinal tracts of tumor-bearing mice.
• C3H/HeN mammary tumor-bearing mice develop type-specific neutralizing antibodies and group-specific precipitating antibodies for the mouse mammary tumor virus.
• Effect of quinonyl-N-acetyl muramyl dipeptide on immune responses in tumor-bearing mice.
• Systemic Polyomavirus Genome Increase and Dissemination of Capsid-Defective Genomes in Mammary Gland Tumor-Bearing Mice