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Differential activation of the renin-angiotensin system (RAS) likely contributes to sex differences in cardiovascular outcomes in premenopausal women compared with age-matched men. Women demonstrate reduced activation of the vasoconstrictor angiotensin II type 1 receptors (ATR) compared with men, and evidence suggests that women also likely have increased sensitivity of the vasodilatory angiotensin II type 2 receptors (ATR). However, few in vivo studies have directly examined sex differences in ATR-mediated dilation, or the balance between ATR- and ATR-mediated vascular responses in humans. Using the cutaneous microcirculation as a model, we hypothesized that ATR-mediated dilation would be greater in premenopausal women compared with men, and that ATR-blockade would augment ATR-mediated dilation to a greater extent in men than in women. Twelve healthy women (22 ± 3 yr) and 12 men (23 ± 5 yr) had two intradermal microdialysis fibers placed in the ventral forearm for graded infusions of compound 21 (ATR agonist; 10 to 10 M) in a control fiber site and a site treated with 43 µM losartan (ATR antagonist). Red blood cell flux was measured continuously by laser-Doppler flowmetry, and cutaneous vascular conductance [CVC = flux/mean arterial pressure (MAP)] was normalized to maximum [%max; 28 mM sodium nitroprusside (SNP) + 43 °C]. Women had greater ATR-mediated dilation compared with men (women: 25 ± 4 vs. men: 15 ± 2%max, = 0.03). Local ATR inhibition increased ATR-mediated dilation in men (losartan: 26 ± 4 vs. control: 15 ± 2%max, < 0.001) but had no effect in women (losartan: 27 ± 6 vs. control: 25 ± 4%max, > 0.05). These data suggest that premenopausal women have a greater ATR-mediated vasodilation response than men, and that ATR activation inhibits ATR-mediated dilation in men, but not in women. Premenopausal women have greater protection against cardiovascular disease than age-matched men. However, the role of vasoconstrictor angiotensin II type 1 receptors (ATR) and vasodilatory angiotensin II type 2 receptors (ATR) in mediating these sex differences is unclear. Here, we demonstrate that women have greater ATR-mediated vasodilation than men and that ATR negates ATR-mediated dilation in men, but not in women.
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Source |
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http://dx.doi.org/10.1152/japplphysiol.00382.2023 | DOI Listing |
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