当前位置： SCI文献检索 > JOURNAL OF CARDIOVASCULAR PHARMACOLOGY期刊下所有文献 > Contribution of endogenous endothelin-1 and endothelin-A-receptors to the hypertensive state of endothelin-B heterozygous (+/-) knockout mice.

Contribution of endogenous endothelin-1 and endothelin-A-receptors to the hypertensive state of endothelin-B heterozygous (+/-) knockout mice.

Abstract：

:We observed that heterozygous knockout (+/-, KO) of either endothelin-A- (ET(A)) or -B- (ET(B)) receptors significantly reduced the pressor responses to systemically administered endothelin-1 (ET-1) in ET(A) or ET(B) (+/-) KO mice when compared to wild-type (WT) mice (data not shown). Also, we observed that basal mean arterial pressure (MAP) is significantly higher in ET(B) (+/-) (92.7 +/- 1.2 mmHg) (n = 53, p < 0.05) but not ET(A) (+/-) KO mice (70.6 +/- 1.8 mmHg) (n = 23) when compared to their anaesthetized WT littermates (70.1 +/- 0.7 mmHg) (n = 118). A 90 min treatment with either BQ-123 (10 mg/kg), an ET(A)-selective antagonist, or BQ-928 (10 mg/kg), a mixed ET(A)/ET(B) antagonist, administered intraperitoneally, significantly reduced basal MAP of ET(B) (+/-) KO mice almost to the level of their WT treated counterparts (94.9 +/- 4.9 mmHg) (n = 6) vs (+ BQ-123: 59.7 +/- 0.3 mmHg, n = 8); (+ BQ-928: 72.4 +/- 2.6 mmHg, n = 5). It is worthy of note that BQ-123 significantly reduced basal MAP in WT mice but to a lesser extent than in ET(B) (+/-) KO mice (69.6 +/- 2.3 mmHg, n = 8) vs (+ BQ-123: 57.3 +/- 1.4 mmHg, n = 8). In contrast, the ET(B)-selective antagonist, BQ-788 (10 mg/kg i.p.), had no significant effect on MAP even after 90 min of treatment (ET(B) (+/-) KO: (92.3 +/- 2.3 mmHg, n = 6) vs (+ BQ-788: 89.7 +/- 3.1 mmHg, n = 6); WT: (70.5 +/- 3.7 mmHg, n = 7) vs (+ BQ-788: 71.2 +/- 2.0 mmHg, n = 6). Therefore heterozygous KO of either ET(A)- or ET(B)-receptors significantly alters the phenotypic pressor properties of ET-1. We also suggest that there is less ET clearance in ET(B) (+/-) KO mice than in WT mice, which can explain the ET(A)-dependent hypertensive state of the former strain.

journal_name

J Cardiovasc Pharmacol

journal_title

Journal of cardiovascular pharmacology

authors

Berthiaume N,Yanagisawa M,D'Orléans-Juste P

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

S72-4

issue

5 Suppl 1

eissn

0160-2446

issn

1533-4023

journal_volume

36

pub_type

杂志文章

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