Regulation of immune responses by T cell subsets. Role of helper and suppressor T cells in the development and expression of MHC-restricted antibody responses to L-glutamic acid60-L-alanine30-L-tyrosine10 (GAT) by (responder X responder)F1 spleen cells.
The roles of helper and suppressor T cells in the development and expression of antibody responses to GAT were studied in (responder X responder)F1 mice immunized with parental GAT-M phi. Spleen cells from (B10 X B10.D2)F1 mice primed in vivo with B10 or B10.D2 GAT-M phi developed secondary in vitro plaque-forming cell (PFC) responses only when stimulated by GAT-M phi syngeneic with the GAT-M phi used for in vivo priming. By contrast, virgin F1 spleen cells developed comparable primary PFC responses to both parental GAT-M phi Co-culture of T cells from (B10 X B10.D2)F1 mice primed in vivo by B10 GAT-M phi with virgin (B10 X B10.D2)F1 spleen cells demonstrated the presence of suppressor cells that inhibited the primary response of virgin spleen cells stimulated by B10.D2 GAT-M phi. Spleen cells from (B10 X B10.D2)F1 mice primed in vivo with B10.D2 GAT-M phi had suppressor T cells that suppressed primary responses stimulated by B10 GAT-M phi. The suppressor T cell mechanism was composed of at least two regulatory T cell subsets. Suppressor-inducer T cells were Lyt-2-, I-J+ and must be derived from immune spleen cells. Suppressor-effector T cells can be derived from virgin or immune spleens and were Lyt-2+ cells. When the suppressor mechanism was disabled by treatment with 1000 rad gamma irradiation or removal of Lyt-2+ cells, Lyt-2-helper T cells from (B10 X B10.D2)F1 mice primed with B10 GAT-M phi provided radioresistant help to virgin F1 B cells stimulated by B10 but not B10.D2 GAT-M phi. Suppressor inducer Lyt-2-,I-J+ cells from B10 GAT-M phi-primed (B10 X B10.D2)F1 mice were separated from the primed Lyt-2-,I-J-helper T cells. In the presence of Lyt-2+ suppressor effector cells, the Lyt-2-,I-J+ suppressor-inducer suppressed the primary response of virgin spleen or virgin T plus B cells stimulated by both B10 and B10.D2 GAT-M phi. Therefore, suppressor T cells were able to suppress primary but not secondary GAT-specific PFC responses stimulated by either parental GAT-M phi. These results showed that immunization of (responder X responder)F1 mice with parental GAT-M phi results in the development of antigen-specific helper and suppressor T cells. The primed helper T cells were radioresistant and were genetically restricted to interact with GAT in association with the major histocompatibility complex antigens of the M phi used for in vivo priming.(ABSTRACT TRUNCATED AT 400 WORDS)
J P
JP
Lake
J A
JA
Kapp
C W
CW
Pierce
D000818:Animals; D000917:Antibody Formation / Q000528:radiation effects; D000950:Antigens, Ly; D002469:Cell Separation; D000939:Epitopes; D006649:Histocompatibility Antigens / Q000235:genetics / Q000276:immunology; D000949:Histocompatibility Antigens Class II; D008264:Macrophages / Q000276:immunology / Q000637:transplantation; D008285:Major Histocompatibility Complex; D051379:Mice; D008810:Mice, Inbred C57BL; D010455:Peptides / Q000008:administration & dosage / Q000276:immunology*; D010641:Phenotype; D011108:Polymers; D013154:Spleen / Q000166:cytology / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000145:classification / Q000276:immunology* / Q000528:radiation effects; D050378:T-Lymphocytes, Regulatory / Q000145:classification / Q000276:immunology*
D000950:Antigens, Ly; D000939:Epitopes; D006649:Histocompatibility Antigens; D000949:Histocompatibility Antigens Class II; C043911:I-J-antigen; D010455:Peptides; D011108:Polymers; C020749:GAT