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. 1991 Jun;103(2):1441–1448. doi: 10.1111/j.1476-5381.1991.tb09808.x

Endothelial modulation and changes in endothelin pressor activity during hypoxia in the rat isolated perfused superior mesenteric arterial bed.

S A Douglas 1, S James 1, C R Hiley 1
PMCID: PMC1908378  PMID: 1884099

Abstract

1. The isolated superior mesenteric arterial bed of the rat, perfused with Krebs-Henseleit solution containing 10 microM indomethacin, was used to study the effects of reducing dissolved O2 tension on the pressor responses to endothelin-1, endothelin-3 and sarafotoxin S6b. The modulation of these responses by the endothelium was investigated by removing the intima with the detergent CHAPS and, for endothelin-1, by inhibiting nitric oxide production with N omega-nitro-L-arginine methyl ester (L-NAME). Comparison was made with the effects of lowering O2 tension on the pressor responses to noradrenaline and 5-hydroxytryptamine. 2. Lowering the perfusate O2 tension from 551 +/- 2 mmHg to 14.0 +/- 0.5 mmHg did not change the ED50 for endothelin-1 but its maximal responses (Rmax) were increased by 2.1 and 2.7 fold, respectively, in the presence and absence of endothelium. The Rmax values for endothelin-3 were also greater in hypoxia either in the presence (by 2.3 fold) or absence of the endothelium (by 1.6 times) but those for sarafotoxin S6b were only enhanced significantly by hypoxia in the absence of the intima. hypoxia reduced the potencies of endothelin-3 and sarafotoxin S6b whether or not endothelium was present. 3. Endothelial destruction, whether in hypoxic or oxygenated conditions, increased the Rmax values for endothelin-1 and endothelin-3; at both O2 tensions those for endothelin-3 increased more than those for endothelin-1. The ED50 for endothelin-1 was unchanged by destroying the endothelium but endothelin-3 was less potent in the absence of an endothelium than in its presence.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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