Abstract
1. Strips of rabbit superior mesenteric artery, precontracted with phenylephrine, relaxed when exposed to human recombinant interleukin-1 (IL-1) of the alpha or beta types. The effect was observed within 10 min, was optimal 32 min after the application of the cytokines and concentration-dependent (12-290 pM). 2. IL-1 alpha and IL-1 beta were equipotent in relaxing the rabbit mesenteric artery. A synthetic fragment corresponding to IL-1 beta 163-171 was approximately one million fold less active than IL-1 beta. The tripeptide Lys-D-Pro-Thr, an analogue of IL-1 beta 193-195, was inactive as an antagonist of IL-1 beta on the preparation. 3. Indomethacin (2.8 microM) prevented or acutely reversed IL-1-induced relaxations in the rabbit mesenteric artery. Purified haemoglobin (10 microM) or the removal of endothelium had no effect on relaxations elicited by IL-1 beta. 4. The preparation exhibited some selectivity for IL-1 as recombinant human tumour necrosis factor-alpha (TNF-alpha), IL-2 or IL-6 failed to influence it. TNF-alpha was not synergistic with a subthreshold concentration of IL-1 beta. 5. Immunoreactive 6-keto-prostaglandin F1 alpha and prostaglandin E2 were increased in the bathing fluid of isolated mesenteric arteries exposed to IL-1 beta as compared to controls. 6. A supernatant of lipopolysaccharide-stimulated human monocytes produced a relaxation of the preparation with a profile similar to that produced with IL-1s and there was a good quantitative agreement between the extent of the relaxation and the enzyme immunoassay measurements of IL-1 alpha and IL-1 beta in the supernatant.(ABSTRACT TRUNCATED AT 250 WORDS)
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