Regulation of macrophage tumoricidal function: a role for prostaglandins of the E series

Exogenously added prostaglandins E1 and E2, but not F2alpha, inhibited the tumoricidal activity of interferon-activated macrophages of mice. A role for adenosine 3',5'-monophosphate (cyclic AMP) in modulating macrophage functional activity was suggested because prostaglandins of the E series increase intracellular concentrations of cyclic AMP in macrophages and because treatment of interferon-activated macrophages with dibutyryl cyclic AMP consistently inhibits expression of cytotoxicity. Since the activated macrophage releases high concentrations of prostaglandin E2, it is postulated that this prostaglandin could act locally in negative feedback inhibition to limit cell activities.