title: Age- and tumor-correlated changes in functional antibody responses to MTV in neonatally infected mice.
abstract: BALB/cfC3H female mice (neonatally infected with MTV) possess several different specific antibody activities measured functionally by reactivity with MTV-associated antigens expressed on the surface of isologous MTV-induced mammary tumor target cells. All females when young develop serum antibody which can block specific T-cell cytotoxic activity of BALB/cfC3H spleen cells; this activity remains detectable throughout life. In addition, recruiting antibody is found in the post-weaning stage. This recruiting activity is apparently directed against the same antigenicity as the blocking activity; it can be detected only rarely in whole serum but is revealed in the 19S fraction when the competing blocking antibodies are sequestered into the 7S fraction. In mid-adult life, 19S recruiting activity is found in only a few of the females; the incidence increases as the females age, and it occurs earlier in those females which subsequently develop mammary tumors. A third antibody activity of serum is blocking factor directed against different MTV-associated tumor-cell-surface antigenicity; this blocks the antibody-dependent cell-mediated cytotoxicity characteristic of spleen cells from BALB/c females horizontally exposed to MTV-associated antigenicity. This blocking activity of serum is not found in young females, and in the older females it is more frequent in those which develop mammary tumors.
mesh_terms: D000367:Age Factors; D000818:Animals; D000912:Antibodies, Neoplasm / Q000032:analysis; D000917:Antibody Formation; D000920:Antibody-Dependent Cell Cytotoxicity; D000951:Antigens, Neoplasm / Q000276:immunology; D005260:Female; D005333:Fetus; D007075:Immunoglobulin M / Q000276:immunology; D007165:Immunosuppression Therapy; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000276:immunology* / Q000473:pathology; D008324:Mammary Tumor Virus, Mouse / Q000276:immunology*; D051379:Mice; D011247:Pregnancy; D012737:Sex Factors; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D007075:Immunoglobulin M