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. 1993 May;109(1):8–13. doi: 10.1111/j.1476-5381.1993.tb13524.x

Acetylcholine-induced relaxation in bovine isolated mesenteric arteries is suppressed by polymorphonuclear leukocytes.

S J De Kimpe 1, D Van Heuven-Nolsen 1, F P Nijkamp 1
PMCID: PMC2175583  PMID: 8388304

Abstract

1. The endothelium plays a critical role in maintaining vascular tone via generation of potent vasoconstrictor and dilator substances. We examined the effect of bovine purified polymorphonuclear leukocytes (PMN) on the endothelium-dependent relaxation to acetylcholine in isolated mesenteric arteries. 2. In the presence of PMN (2.5 x 10(6) cells ml-1) the maximal relaxation to acetylcholine was decreased from 76.1 +/- 2.4% to 44.9 +/- 7.4% of the precontraction (P < 0.001). This effect was inhibited by superoxide dismutase and NG-mono-methyl-L-arginine, but not by catalase or indomethacin. 3. PMN were not able to influence significantly the endothelium-independent relaxation to nitroprusside. 4. Removal of PMN after preincubation and prior to precontraction and relaxation did not influence the acetylcholine-induced relaxation, indicating that no irreversible vascular damage had occurred. 5. Superoxide anion production by unstimulated PMN was less than 10% compared to phorbol myristate acetate-activated PMN, measured by chemiluminescence and reduction of ferricytochrome c. 6. We conclude that small amounts of superoxide anions produced by unstimulated PMN contribute to a decrease in relaxation to acetylcholine by interfering with endothelium-derived nitric oxide.

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Selected References

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