title: The roles of CD8+ and CD4+ cells in tumor rejection.
abstract: In vivo administrations of anti-Lyt-2.2 (CD8) mAb and anti-L3T4 (CD4) mAb selectively eliminated CD8+ cells and CD4+ cells, respectively. The relative potencies of CD8+ cells and CD4+ cells and their roles in primary tumor rejections were studied by investigating the effects of these mAbs on tumor growth. CD8+ cells were themselves fully capable of mediating rejection in 5 different tumor rejection systems: two radiation leukemia virus (RadLV)-induced leukemias, B6RV2 and BALBRVD, a radiation-induced leukemia BALBRL male 1, and a plasmacytoma BALBMOPC-70A in CB6F1 mice, and a Friend virus-induced leukemia B6FBL-3 in B6 mice. On the other hand, CD4+ cells were capable of resisting tumor growth of B6FBL-3, but not of the other four tumors. Furthermore, for efficient rejection of CB6F1UV female 1 sarcoma by CB6F1 mice, synergy of CD8+ and CD4+ cells was necessary. Blocking of UV female 1 rejection was abrogated by delayed administration of anti-L3T4 (CD4) mAb but not anti-Lyt-2.2 (CD8) mAb, indicating the involvement of CD4+ cells in only the initial phase of rejection.
authors.affiliation: Department of Oncology, Nagasaki University School of Medicine.
authors.forename: H
authors.initials: H
authors.lastname: Udono
authors.forename: M
authors.initials: M
authors.lastname: Mieno
authors.forename: H
authors.initials: H
authors.lastname: Shiku
authors.forename: E
authors.initials: E
authors.lastname: Nakayama
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000950:Antigens, Ly / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D005260:Female; D006084:Graft Rejection; D006182:H-Y Antigen / Q000276:immunology; D008297:Male; D051379:Mice; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000950:Antigens, Ly; D006182:H-Y Antigen