Stimulation of prostaglandin E production by concanavalin A in isolated Graafian follicles

Addition of Concanavalin A (Con A) to isolated rat Graafian follicles induced prostaglandin E (PGE) production after 2 h of incubation. PGE synthesis continued throughout 24 h culture period. Cyclic AMP accumulation was noted after 6 h of incubation with Con A. .Aspirin, indomethacin and flufenamate prevented both the stimulation of PGE production and of cyclic AMP accumulation by Con A; antibodies to PGE prevented the cyclic AMP production. These studies indicate that the interaction of Con A with the follicle results in PGE production. It seems that besides the known pathway for the induction of PGE synthesis in the ovarian follicle, via elevation of intracellular cyclic AMP, an additional pathway, via an external signal which is independent of cyclic AMP exists.