title: Multidirectional interactions in vitro between lymphoid cells from Mls-disparate strains.
abstract: Chromosome 1 of the mouse carries a number of genes for alloantigens which can be recognized by T cells, among those the mixed lymphocyte stimulation (Mls) locus and the lymphocyte stimulating determinant (Lsd) locus have been described. The Relationship between the antigens coded for by these two loci has been further analyzed using a B10.BR anti C3H/Tif T cell clone E11. Segregation analysis was done with 167 individuals from backcrosses of (BALB/c (Mlsb, Lsd-) x DBA/2 (Mlsa, Lsd+] F1 animals into BALB/c mice. The analysis of the backcross data and of a limited number of recombinant inbred (RI) strains did not allow the segregated of the two loci, despite the fact that stable clusters were obtained in cluster analysis of the segregation data. The reasons for this failure are discussed. Parallel to the genetic analysis, we have studied the functional properties of the E11 T cell clone. First, there is the proliferation of the E11 T cells upon stimulation by macrophages or B cells of Mls-disparate stimulator strains. Second, there is an induction of differentiation of B cells of stimulator strains, requiring the direct interaction between E11 T and stimulator B cells. Third, there is an inhibitory influence of E11 T cells on the production of a mediator by Mls-disparate spleen cells presumably by their macrophages. We propose that the Mls antigen is a receptor regulating macrophage differentiation and transmitting a signal influencing the production of a mediator. This signal could be either the down regulation of the production of a stimulatory monokine or the induction of the production of an inhibitory monokine. Our presented data demonstrate that the anti Mls response is more complex than hitherto anticipated. It involves a multidirectional interaction between the Mls-disparate cell partners.
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000276:immunology*; D002999:Clone Cells; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008562:Membrane Glycoproteins / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D016747:Minor Lymphocyte Stimulatory Antigens; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000954:Antigens, Surface; D008562:Membrane Glycoproteins; D016747:Minor Lymphocyte Stimulatory Antigens