title: Synergy between stimulator cells in the induction of the anti-Mlsa response.
abstract: We have identified two types of clones responsive to Mls determinants. One type responded vigorously to purified B cells from mice bearing Mlsa-stimulatory determinants. The other type, including clone Ly1-N5, responded vigorously to unfractionated spleen cells, but failed to respond to B cells alone or to spleen-adherent cells (SAC) alone from the Mlsa-bearing mice. Synergy between two stimulator cell types, B cells and SAC, was required to induce the Mls response of clone Ly1-N5. The failure of clone Ly1-N5 to respond to Mlsa-bearing B cells was reversed by the addition of SAC taken from mice bearing the Mlsa allele or the non-stimulatory Mlsb allele. B cells were required to provide the Mlsa determinant. The Mls response of clone Ly1-N5 is restricted by class II determinants shared by the H-2b, H-2d and H-2k haplotypes, but not the H-2q haplotype. The optimal response of the clone was obtained by using B cells bearing both Mlsa and the permissive H-2 alloantigen. However, complementation was also observed between B cells bearing Mlsa and the non-permissive Iaq and SAC bearing the nonstimulatory Mlsb, but a permissive Ia epitope, resulting in activation of the clone. Clone Ly1-N5 responds to Mlsa-bearing B cells only in the presence of SAC.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Children's Hospital, Stanford, Palo Alto, CA 94305.
authors.forename: R H
authors.initials: RH
authors.lastname: DeKruyff
authors.forename: J
authors.initials: J
authors.lastname: Laning
authors.forename: M E
authors.initials: ME
authors.lastname: Dorf
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains; D016747:Minor Lymphocyte Stimulatory Antigens; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D014407:Tumor Cells, Cultured / Q000276:immunology
chemical_list: D000954:Antigens, Surface; D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D016747:Minor Lymphocyte Stimulatory Antigens