Sensory nerve-mediated and nitric oxide-dependent cutaneous vasodilation in normotensive and prehypertensive non-Hispanic blacks and whites
| Autor: | Arshed A. Quyyumi, Casey G Turner, Jeffrey S. Otis, Yesser Sebeh, Matthew J. Hayat, Demetria C Walker, Brett J. Wong, James T. Miller |
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| Rok vydání: | 2020 |
| Předmět: |
Adult
Male medicine.medical_specialty Georgia Endothelium Adolescent Sensory Receptor Cells Physiology Microdialysis Vasodilator Agents Vasodilation Sensory system Blood Pressure Administration Cutaneous Nitric Oxide Prehypertension White People Nitric oxide chemistry.chemical_compound Young Adult Physiology (medical) Internal medicine medicine Humans Anesthetics Local Enzyme Inhibitors Skin business.industry Endothelial Cells Race Factors Black or African American medicine.anatomical_structure Blood pressure Endocrinology chemistry Case-Control Studies Blood Vessels Axon reflex Female Nitric Oxide Synthase Cardiology and Cardiovascular Medicine business Sensory nerve Research Article |
| Zdroj: | Am J Physiol Heart Circ Physiol |
| ISSN: | 1522-1539 |
| Popis: | The purpose of this study was to investigate the effect of race and subclinical elevations in blood pressure (i.e., prehypertension) on cutaneous sensory nerve-mediated and nitric oxide (NO)-dependent vasodilation. We recruited participants who self-identified as either non-Hispanic black (n = 16) or non-Hispanic white (n = 16). Within each group, participants were subdivided as either normotensive (n = 8 per group) or prehypertensive (n = 8 per group). Each participant was instrumented with four intradermal microdialysis fibers: 1) control (lactated Ringer’s), 2) 5% lidocaine (sensory nerve inhibition), 3) 20 mM N(ω)-nitro-l-arginine methyl ester (l-NAME) (NO synthase inhibition), and 4) lidocaine + l-NAME. Skin blood flow was assessed via laser-Doppler flowmetry, and each site underwent local heating from 33°C to 39°C. At the plateau, 20 mM l-NAME were infused at control and lidocaine sites to quantify NO-dependent vasodilation. Maximal vasodilation was induced via 54 mM sodium nitroprusside and local heating to 43°C. Data are means ± SD. Sensory nerve-mediated cutaneous vasodilation was reduced in prehypertensive non-Hispanic white (34 ± 7%) and both non-Hispanic black groups (normotensive, 20 ± 9%, prehypertensive, 24 ± 15%) relative to normotensive non-Hispanic whites (54 ± 12%). NO-dependent vasodilation was also reduced in prehypertensive non-Hispanic white (41 ± 7%) and both non-Hispanic black groups (normotensive, 44 ± 7%, prehypertensive, 19 ± 7%) relative to normotensive non-Hispanic whites (60 ± 11%). The decrease in NO-dependent vasodilation in prehypertensive non-Hispanic blacks was further reduced relative to all other groups. These data suggest subclinical increases in blood pressure adversely affect sensory-mediated and NO-dependent vasodilation in both non-Hispanic blacks and whites. NEW & NOTEWORTHY Overt hypertension is known to reduce cutaneous sensory nerve-mediated and nitric oxide (NO)-dependent vasodilation, but the effect of subclinical increases in blood pressure (i.e., prehypertension) is unknown. The combined effect of race and prehypertension is also unknown. In this study, we found that prehypertension reduces cutaneous sensory nerve-mediated and NO-dependent vasodilation in both non-Hispanic white and black populations, with the greatest reductions observed in prehypertensive non-Hispanic blacks. Listen to this article's corresponding podcast at https://ajpheart.podbean.com/e/race-blood-pressure-and-microvascular-function/. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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