期刊
JOURNAL OF SURGICAL RESEARCH
卷 102, 期 2, 页码 215-220出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jsre.2001.6323
关键词
vascular smooth muscle; endothelium; endothelin receptors; nitric oxide; polysaccharide
类别
资金
- NHLBI NIH HHS [HL-07599] Funding Source: Medline
Background. Poly-N-acetylglucosamine (p-GlcNAc) is a secretion of marine diatoms that is known to be useful in controlling bleeding. As a component of promoting hemostasis, p-GlcNAc is thought to exert vasoconstrictor effects in arteries. The present study was undertaken to determine whether p-GlcNAc induced a significant vasoconstrictor effect and, if so, what the mechanism of this effect might be. Materials and methods. We examined vascular effects of p-GlcNAc on isolated aortic rings obtained from Sprague-Dawley rats. The rings were suspended in organ baths and precontracted with U46619, a thromboxane A(2) mimetic. Results. p-GlcNAc produced a concentration-dependent vasoconstriction over the range of 14 to 100 mug/ml. At a concentration of 100 mug/ml, p-GlcNAc significantly contracted aortic rings by 133 +/- 20 mg of developed force (P < 0.01). Neither a deacetylated derivative of p-GlcNAc nor a structurally related macromolecule, chitin, contracted rat aortic rings, indicating a specificity for p-GlcNAc. The vasoconstriction to p-GlcNAc was totally abolished in deendothelialized rat aortic rings, suggesting that an endothelial component is essential to the vasoconstriction. Pretreatment with the endothelin ETA receptor antagonist, JKC-301 (0.5 and 1 muM), significantly diminished p-GlcNAc-induced vasoconstriction by 57 to 61% (P < 0.01). However, p-GlcNAc did not significantly diminish nitric oxide release from rat aortic endothelium. Conclusion. These results provide evidence that p-GlcNAc significantly contracts isolated rat aortic rings via an endothelium-dependent mechanism, partly via enhancement of endothelin-1 release from endothelial cells. (C) 2001 Elsevier Science.
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