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. 1995 May;115(2):255–260. doi: 10.1111/j.1476-5381.1995.tb15871.x

Potentiation of the hyporeactivity induced by in vivo endothelial injury in the rat carotid artery by chronic treatment with fish oil.

G A Joly 1, V B Schini 1, H Hughes 1, P M Vanhoutte 1
PMCID: PMC1908320  PMID: 7670727

Abstract

1. The present study investigates whether or not chronic feeding of rats with a diet enriched in fish oil affects the reactivity of balloon-injured carotid arteries. The left carotid arteries were injured in vivo by the repeated passage of a balloon catheter. Both the right (control artery) and the left carotid arteries were excised 24 h after the injury, and suspended in organ chambers for the measurement of changes in isometric tension in the presence of indomethacin. 2. Phenylephrine evoked similar concentration-contraction curves in the right (control) carotid arteries without endothelium from control and fish oil-fed rats. Balloon injury decreased the contractility of carotid arteries to phenylephrine in both types of rats and the pEC50 for phenylephrine was significantly decreased in balloon-injured arteries from control rats compared to those obtained in arteries from fish oil-fed rats (pEC50 7.59 +/- 0.1 and 7.28 +/- 0.06, respectively) while maximal contractions were similar (1.93 +/- 0.15 g and 1.79 +/- 0.12 g, respectively). 3. The treatment of control right carotid arteries without endothelium with either NG-nitro-L-arginine (an inhibitor of nitric oxide synthase) or superoxide dismutase (which protects nitric oxide from degradation) did not affect significantly the contractions to phenylephrine in either group. In these preparations, methylene blue (an inhibitor of soluble guanylate cyclase) decreased slightly but significantly maximal contractions to phenylephrine in both groups. The treatment of balloon-injured carotid arteries with NG-nitro-L-arginine or methylene blue partly restored contractions to phenylephrine in arteries from both types of rat.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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