What question did this study set out to answer?

Determine whether ovarian hormones modulate vascular endothelin-1 (ET-1) reactivity, ETB receptor-mediated responses, and mRNA expression in female DOCA-salt hypertensive rats.

September 1, 2001HypertensionOpen Access

Ovarian Hormones Modulate Endothelin-1 Vascular Reactivity and mRNA Expression in DOCA-Salt Hypertensive Rats

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Authors

FDFlávia Lúcia DavidDePaul University MCMaria Helena Catelli de CarvalhoKenya Medical Research Institute ACA L CobraUniversidade de São Paulo

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Implication

Animal study reveals that ovarian hormones blunt endothelin-1-mediated vasoconstriction in DOCA-salt hypertensive rats, indicating a protective mechanism against severe female hypertension.

Key Points

Determine whether ovarian hormones modulate vascular endothelin-1 (ET-1) reactivity, ETB receptor-mediated responses, and mRNA expression in female DOCA-salt hypertensive rats.
Randomized female Wistar rats into sham-operated, ovariectomized (OVX), and OVX plus estradiol (E) or estradiol/progesterone (EP) replacement groups.
Subjected uninephrectomized rats to DOCA-salt treatment or normotensive control conditions.
Measured blood pressure directly and via tail-cuff, assessed in situ mesenteric microvascular responses to the ETB agonist IRL-1620, and measured arterial ET-1 and ETA/B receptor mRNA levels by RT-PCR.
Ovariectomy exacerbated hypertension in DOCA rats and converted mesenteric IRL-1620 responses from mild vasoconstriction to marked vasoconstriction, both of which were reversed by E or EP replacement.
Arterial ET-1 mRNA increased after ovariectomy in both control and DOCA rats, whereas ETB receptor mRNA was selectively elevated in OVX-DOCA rats; hormone replacement restored both to baseline DOCA levels.
The dual ETA/ETB receptor antagonist bosentan produced a significantly greater blood pressure-lowering effect in OVX-DOCA rats compared to intact DOCA rats.

Cite This Study

David et al. (2001) studied this question.

synapsesocial.com/papers/6a71a47775498292b70b0dd7 https://doi.org/10.1161/01.hyp.38.3.692

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Implication

Animal study reveals that ovarian hormones blunt endothelin-1-mediated vasoconstriction in DOCA-salt hypertensive rats, indicating a protective mechanism against severe female hypertension.

Ovarian Hormones Modulate Endothelin-1 Vascular Reactivity and mRNA Expression in DOCA-Salt Hypertensive Rats

Discussion

Member takes

Implication

Key Points

Cite This Study

Ovarian Hormones Modulate Endothelin-1 Vascular Reactivity and mRNA Expression in DOCA-Salt Hypertensive Rats

Discussion

Member takes

Implication

Key Points

Cite This Study

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