Interleukin-1 beta increases prostaglandin E2 in rat astrocyte cultures: modulatory effect of neuropeptides.
Recombinant human interleukin-1 beta (IL-1 beta) significantly increased prostaglandin E2 (PGE2) in a dose-dependent manner in rat astrocyte culture. The minimum effective dose of IL-1 beta was 10(-10)M. IL-1 alpha also increased PGE2, but at a higher concentration. The minimum effective dose of IL-1 alpha was 10(-8)M, indicating it to be 100-fold less effective than IL-1 beta. On the other hand neither IL-1 beta nor IL-1 alpha increased PGE2 production by neuron cultures at any concentration tested. PGE2 response to IL-1 beta was suppressed by simultaneous addition of CRH, somatostatin-14 and LHRH, while these neuropeptides alone did not alter the basal PGE2 levels. Substance P, vasoactive intestinal polypeptide and alpha-MSH altered neither basal nor IL-1 beta-induced increase in PGE2 levels. Angiotensin II (AII) alone also increased PGE2 in cultured astrocytes. Combined addition of AII and IL-1 beta induced a synergistic effect in increasing PGE2 levels. The direct action of IL-1 beta on astrocyte culture suggests that astrocytes may be the target cells for IL-1 beta in the central nervous system. In view of the essential role of central PGE2 in IL-1 beta-induced CRH/ACTH release, these findings suggest the presence of a sophisticated regulatory network in the immune-neuroendocrine interaction.
Katsuura
G
G
US-Japan Biomedical Research Laboratories, Tulane University Herbert Center, Belle Chasse, LA 70037.
Gottschall
P E
PE
Dahl
R R
RR
Arimura
A
A
D000818:Animals; D000831:Animals, Newborn; D001253:Astrocytes / Q000187:drug effects / Q000378:metabolism*; D001921:Brain / Q000378:metabolism; D002478:Cells, Cultured; D046508:Culture Techniques / Q000379:methods; D015232:Dinoprostone / Q000096:biosynthesis*; D007375:Interleukin-1 / Q000494:pharmacology*; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D009479:Neuropeptides / Q000494:pharmacology*; D051381:Rats; D011994:Recombinant Proteins / Q000494:pharmacology
D007375:Interleukin-1; D009479:Neuropeptides; D011994:Recombinant Proteins; D015232:Dinoprostone