title: The role of I-J and Igh determinants on F1-derived suppressor factor in controlling restriction specificity.
abstract: In the 4-hydroxy-3-nitrophenyl acetyl (NP) contact sensitivity system, the activity of third-order suppressor cells and their factors is restricted by H-2(I-J) and Igh linked genes. The present report analyzes the specificity of NP-specific Ts3 cells and factors derived from H-2 and Igh heterozygous (B6 X C3H)F1 mice. Two approaches were used. First, heterogeneous populations of F1 Ts3 cells were activated in vitro and then assayed in Ts3-depleted recipients which carried different combinations of H-2 and Igh alleles. The second approach was to hybridize the Ts3 cells and analyze the specificity of the F1-derived TsF3. The combined data demonstrated four functionally distinct populations of Ts3 cells. The activity of each population was restricted by a particular combination of H-2 and Igh haplotypes. Thus, Ts3 cells derived from F1 donors can demonstrate an apparent scrambling of H-2 and Igh restriction specificities. There was functional allelic exclusion of the H-2(I-J) and Igh determinants expressed on (B6 X C3H)F1 hybridoma-derived TsF3. Thus, TsF3 from each cloned hybridoma line expressed only one set of I-J and Igh determinants. Furthermore, there was a complete correlation between the I-J and Igh linked determinants expressed on TsF3 and the restriction specificity. In view of the recent findings on the molecular biology of the I-J region, an alternative interpretation of the role of I-J determinants on suppressor cells and factors is offered.
mesh_terms: D000818:Animals; D000939:Epitopes / Q000235:genetics*; D005786:Gene Expression Regulation; D006183:H-2 Antigens / Q000235:genetics*; D006825:Hybridomas / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000276:immunology; D008213:Lymphocyte Activation; D008222:Lymphokines / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008809:Mice, Inbred C3H; D013491:Suppressor Factors, Immunologic; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000939:Epitopes; D006183:H-2 Antigens; D007130:Immunoglobulin Idiotypes; D008222:Lymphokines; D013491:Suppressor Factors, Immunologic