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Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats

Nitric oxide (NO) contributes to blood pressure (BP) regulation via its vasodilatory and anti‐inflammatory properties. We and others previously reported sex differences in BP in normotensive and hypertensive rat models where females have lower BP than age‐matched males. As females are known to have...

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Autores principales: Elmarakby, Ahmed A., Saad, Karim M., Crislip, G. Ryan, Sullivan, Jennifer C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10406564/
https://www.ncbi.nlm.nih.gov/pubmed/37549936
http://dx.doi.org/10.14814/phy2.15771
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author Elmarakby, Ahmed A.
Saad, Karim M.
Crislip, G. Ryan
Sullivan, Jennifer C.
author_facet Elmarakby, Ahmed A.
Saad, Karim M.
Crislip, G. Ryan
Sullivan, Jennifer C.
author_sort Elmarakby, Ahmed A.
collection PubMed
description Nitric oxide (NO) contributes to blood pressure (BP) regulation via its vasodilatory and anti‐inflammatory properties. We and others previously reported sex differences in BP in normotensive and hypertensive rat models where females have lower BP than age‐matched males. As females are known to have greater NO bioavailability than age‐matched males, the current study was designed to test the hypothesis that anesthetized female normotensive Wistar Kyoto rats (WKY) are more responsive to acute NOS inhibition‐induced increases in BP compared to male WKY. Twelve‐week‐old male and female WKY were randomized to infusion of the nonspecific NOS inhibitor N(G)‐nitro‐L‐arginine methyl ester (L‐NAME, 1 mg/kg/min) or selective NOS1 inhibition with vinyl‐L‐NIO (VNIO, 0.5 mg/kg/min) for 60 min. Mean arterial BP, glomerular filtration rate (GFR), urine volume, and electrolyte excretion were assessed before, and during L‐NAME or VNIO infusion. L‐NAME and VNIO significantly increased BP in both sexes; however, the increase in BP with L‐NAME infusion was greater in females versus males compared to baseline BP values. Acute infusion of neither L‐NAME nor VNIO for 60 min altered GFR in either sex. However, urine volume, sodium, chloride and potassium excretion levels increased comparably in male and female WKY with L‐NAME and VNIO infusion. Our findings suggest sex differences in BP responses to acute non‐isoform‐specific NOS inhibition in WKY, with females being more responsive to L‐NAME‐induced elevations in BP relative to male WKY. However, sex differences in the BP response did not coincide with sex differences in renal hemodynamic responses to acute NOS inhibition.
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spelling pubmed-104065642023-08-08 Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats Elmarakby, Ahmed A. Saad, Karim M. Crislip, G. Ryan Sullivan, Jennifer C. Physiol Rep Original Articles Nitric oxide (NO) contributes to blood pressure (BP) regulation via its vasodilatory and anti‐inflammatory properties. We and others previously reported sex differences in BP in normotensive and hypertensive rat models where females have lower BP than age‐matched males. As females are known to have greater NO bioavailability than age‐matched males, the current study was designed to test the hypothesis that anesthetized female normotensive Wistar Kyoto rats (WKY) are more responsive to acute NOS inhibition‐induced increases in BP compared to male WKY. Twelve‐week‐old male and female WKY were randomized to infusion of the nonspecific NOS inhibitor N(G)‐nitro‐L‐arginine methyl ester (L‐NAME, 1 mg/kg/min) or selective NOS1 inhibition with vinyl‐L‐NIO (VNIO, 0.5 mg/kg/min) for 60 min. Mean arterial BP, glomerular filtration rate (GFR), urine volume, and electrolyte excretion were assessed before, and during L‐NAME or VNIO infusion. L‐NAME and VNIO significantly increased BP in both sexes; however, the increase in BP with L‐NAME infusion was greater in females versus males compared to baseline BP values. Acute infusion of neither L‐NAME nor VNIO for 60 min altered GFR in either sex. However, urine volume, sodium, chloride and potassium excretion levels increased comparably in male and female WKY with L‐NAME and VNIO infusion. Our findings suggest sex differences in BP responses to acute non‐isoform‐specific NOS inhibition in WKY, with females being more responsive to L‐NAME‐induced elevations in BP relative to male WKY. However, sex differences in the BP response did not coincide with sex differences in renal hemodynamic responses to acute NOS inhibition. John Wiley and Sons Inc. 2023-08-07 /pmc/articles/PMC10406564/ /pubmed/37549936 http://dx.doi.org/10.14814/phy2.15771 Text en © 2023 The Authors. Physiological Reports published by Wiley Periodicals LLC on behalf of The Physiological Society and the American Physiological Society. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Elmarakby, Ahmed A.
Saad, Karim M.
Crislip, G. Ryan
Sullivan, Jennifer C.
Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats
title Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats
title_full Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats
title_fullStr Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats
title_full_unstemmed Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats
title_short Acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male Wistar Kyoto rats
title_sort acute nitric oxide synthase inhibition induces greater increases in blood pressure in female versus male wistar kyoto rats
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10406564/
https://www.ncbi.nlm.nih.gov/pubmed/37549936
http://dx.doi.org/10.14814/phy2.15771
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