The pharmacologic regulation of interleukin-1 production: the role of prostaglandins

Cellular Immunology
I G OtternessD C Hanson


The role of prostaglandins in the regulation of lipopolysaccharide (LPS)-induced interleukin-1 (IL-1) production by murine C3H/HeN resident peritoneal macrophages was studied. IL-1 production was initially studied in the presence of piroxicam and indomethacin, both inhibitors of prostaglandin biosynthesis. IL-1 was assayed using the IL-1-dependent proliferative response of C3H/HeJ thymocytes. LPS stimulation resulted in 15 to 20 ng/ml of prostaglandin E2 (PGE2) produced in the first hour of culture. IL-1-containing supernatants from drug-treated macrophages at dilutions of up to 1:32 resulted in enhanced thymocyte proliferation compared to control, non-drug-treated cultures and contained less than 2 ng/ml of PGE2. Similar enhancement of proliferation could be obtained by incubating non-drug-treated supernatants with monoclonal anti-PGE2 but not anti-thromboxane B2 (TxB2) antibody. Further dilutions of the drug-treated supernatants gave thymocyte proliferation responses which were indistinguishable from control cultures and, correspondingly, had identical values for IL-1 production. The absence of an effect on IL-1 production was confirmed by quantitation of intracellular IL-1 alpha using goat anti-IL-1 alpha antibody and by qua...Continue Reading


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