Effect of PGE2 on thymocyte proliferation induced by Con A or IL-4 + PMA.
Prostaglandin E2 (PGE2) is known to inhibit peripheral T-lymphocyte and thymocyte proliferation activated by antigens, mitogens or anti-CD3 antibodies. In this study, we have investigated, the effect of PGE2 on thymocyte proliferation induced by the combination of IL-4 plus PMA. PGE2 inhibits the proliferation of thymocytes activated by ConA, whatever the culture period; in contrast PGE2 shifts the kinetics of thymocyte proliferation after stimulation by IL-4 plus PMA, but does not sustain the proliferation beyond day 3. This effect depends upon cell density, IL-4 concentration and on the time that PGE2 is added to the culture. By use of the cAMP inducer, forskolin, or a cAMP analog, db-cAMP, we observed the same results, PGE2 increases the proliferation of CD8+ corticoresistant thymocytes (CRT) activated by IL-4 plus PMA, but inhibits that of CD4+ CRT. These results suggest that PGE2 can regulate thymocyte proliferation differently according to the activation pathway and the thymic subpopulations.
Daculsi
R
R
CNRS, URA 1456, Hôpital Pellegrin, Bordeaux, France.
Vaillier
D
D
Bezian
J H
JH
Gualde
N
N
D000818:Animals; D015704:CD4 Antigens; D016827:CD8 Antigens; D002452:Cell Count; D003208:Concanavalin A / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism; D015232:Dinoprostone / Q000494:pharmacology*; D066298:In Vitro Techniques; D015847:Interleukin-4 / Q000008:administration & dosage; D007700:Kinetics; D008213:Lymphocyte Activation / Q000187:drug effects*; D008297:Male; D051379:Mice; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D013755:Tetradecanoylphorbol Acetate / Q000008:administration & dosage
D015704:CD4 Antigens; D016827:CD8 Antigens; D003208:Concanavalin A; D015847:Interleukin-4; D000242:Cyclic AMP; D015232:Dinoprostone; D013755:Tetradecanoylphorbol Acetate