title: Inhibition of replication of virus-transformed fibroblasts by antibodies to RNA.
abstract: The activity of 7S immunoglobulins (Ig) antibody to RNA, obtained in rabbits after a prolonged immunization with RNA-methylated bovine serum albumin complex was evaluated in vitro on normal (3T3) and simian virus 40-transformed (SV 3T3) mouse fibroblasts. The presence of anti-RNA antibody in the culture medium inhibited both the SV 3T3 cell proliferation and the [3H]thymidine incorporation. In contrast, an increased [3H]uridine incorporation was evident within 48 and 96 hr of culture. No significant modification in these 3 parameters was observed in 3T3 cultures treated in the same manner. Both 3T3 and SV 3T3 showed cytoplasmic fluorescence when cultured in the presence of fluoresceinated anti-RNA Ig. However, with the indirect fluorescence technique anti-RNA Ig were detected in SV 3T3 cytoplasm only. These data suggest that anti-RNA Ig were taken up by both 3T3 and SV 3T3, but only in SV 3T3 did the anti-RNA Ig retain their antigenic properties and block cellular proliferation.
mesh_terms: D000906:Antibodies; D000918:Antibody Specificity; D001666:Binding Sites, Antibody; D002455:Cell Division; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured; D003593:Cytoplasm / Q000276:immunology; D004273:DNA, Neoplasm / Q000096:biosynthesis; D005347:Fibroblasts / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D007136:Immunoglobulins; D012313:RNA / Q000276:immunology*; D012334:RNA, Neoplasm / Q000096:biosynthesis; D013539:Simian virus 40
chemical_list: D000906:Antibodies; D004273:DNA, Neoplasm; D007136:Immunoglobulins; D012334:RNA, Neoplasm; D012313:RNA