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. 1994 Jun;112(2):471–476. doi: 10.1111/j.1476-5381.1994.tb13097.x

Vasoconstrictor responses after neo-intima formation and endothelial removal in the rabbit carotid artery.

G R De Meyer 1, H Bult 1, L Ustünes 1, M Kockx 1, F H Jordaens 1, L L Zonnekeyn 1, A G Herman 1
PMCID: PMC1910355  PMID: 7521257

Abstract

1. The present study examined the responses of the rabbit carotid artery to five vasoconstrictors after neo-intima formation induced by perivascular collar treatment and evaluated the role of constitutive and inducible nitric oxide (NO) synthase and endothelial cells (ECs). 2. Ring segments of the rabbit carotid artery were mounted in organ chambers for isometric tension recording. Neo-intima-bearing vessels developed less force (Emax) in response to KCl, the thromboxane-mimetic U-46619 and 5-hydroxytryptamine (5-HT), but not to angiotensin I and II. 3. The collar-treatment increased the sensitivity to 5-HT, and decreased the sensitivity to angiotensin II. The sensitivity to U-46619 and angiotensin I remained unchanged. 4. Mechanical removal of ECs and inhibition of NO biosynthesis by NG-monomethyl-L-arginine (L-NMMA) and NG-nitro-L-arginine (L-NOARG) increased the sensitivity to 5-HT in sham and collar-treated segments to the same extent. The effects of collar-treatment and endothelial removal or treatment with inhibitors of NO biosynthesis were additive. Inhibition of NO biosynthesis failed to augment sensitivity to 5-HT after endothelial denudation. L-NOARG increased the force development to KCl in sham and collar-treated segments to the same extent. However, L-NMMA and L-NOARG failed to augment the contractile responses of neo-intima-bearing vessels to 5-HT and KCl after endothelial removal. 5. The responses to angiotensin I were not altered, either by the neo-intima or by endothelial removal. In arteries with a neo-intima the sensitivity to angiotensin II was decreased.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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