Modulation of T cell responses after cross-talk between antigen presenting cells and T cells: a give-and-take relationship.
T cells presenting antigens in the context of MHC class II can induce anergy. In rat CD4+ T cell clones we have shown that depending on the depth of anergy other T cell responses can be inhibited in the presence of professional antigen presenting cells (APCs). This inhibition is cell-contact dependent, and APCs recovered from co-cultures with suppressive anergic T cells are modulated in their capacity to activate T cells. No changes in cell surface expression of MHC molecules, B7-1/B7-2, and OX40L were detected. Remarkably cell clusters formed by anergic T cells appeared to be more tight than clusters of activated T cells, and after fluorescent cell surface labelling of T cells, transfer of label was more profound in co-cultures of anergic T cells and APCs compared to activated T cells and APCs. Previously, it has been shown that activated T cells can absorb molecules from APCs in a unidirectional process. We now have evidence that also APCs can absorb cell surface molecules from T cells during APC-T cell co-cultures. We speculate that the quantity and quality of molecule reshuffling during cross-talk between T cells and APCs play a role in the regulation of the T cell response.
Wauben
Marca H M
MH
Department of Infectious Diseases & Immunology, Faculty of Veterinary Medicine, Utrecht University, P.O. Box 80.165, 3508 TD Utrecht, The Netherlands.
't Hoen
Esther N M
EN
Taams
Leonie S
LS
D000818:Animals; D000938:Antigen-Presenting Cells / Q000166:cytology / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D002450:Cell Communication / Q000276:immunology; D017635:Clonal Anergy; D018920:Coculture Techniques; D006801:Humans; D008285:Major Histocompatibility Complex; D018448:Models, Immunological; D051381:Rats; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*