Cross-talk between gammadelta T lymphocytes and immune cells in humoral response.
The role of gamma delta T cells in immunoregulation is largely unknown. In the current study we noted that gamma delta T cells play a positive role in the humoral response. These positively acting gamma delta T cells are required for the successful adoptive cell transfer of the humoral response, as well as for in vitro generation of plaque-forming cells (PFC). The presented results show that gammadelta T cells cause an increase in interleukin-10 (IL-10) production, which partly elucidates the mechanism of action of these cells. However, experiments with cell culture inserts strongly suggest that direct cell-cell contact between immune and gamma delta H-2-compatible regulatory T cells is critical to the exertion of the positive immunoregulatory function of gamma delta cells. The mechanism of cross-talk between these two cell populations is still not clear but we regard as most likely that the positively acting gamma delta T cells may interact with a complex of heat-shock protein-non-polymorphic MHC (IB) on the surface of T helper type 2 and/or B cells. This could provide, by direct cell-cell contact, the cognate recognition between gamma delta T-cell receptors and heat-shock protein-MHC that leads to positive internal signalling in the immune cells.
Szczepanik
M
M
Jagiellonian University, College of Medicine, Department of Immunology, Cracow, Poland.
Nowak
B
B
Askenase
P W
PW
Ptak
W
W
D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D000917:Antibody Formation / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002450:Cell Communication; D002478:Cells, Cultured; D016753:Interleukin-10 / Q000096:biosynthesis*; D007376:Interleukin-2 / Q000096:biosynthesis; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008808:Mice, Inbred CBA; D020239:Receptor Cross-Talk; D016692:Receptors, Antigen, T-Cell, gamma-delta; D012756:Sheep; D013601:T-Lymphocytes / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology
D000911:Antibodies, Monoclonal; D007376:Interleukin-2; D016692:Receptors, Antigen, T-Cell, gamma-delta; D016753:Interleukin-10