Sex differences in acute ANG II-mediated hemodynamic responses in mice.
Male sex is associated with higher blood pressure and greater renal injury, perhaps related to greater sensitivity to ANG II. In anesthetized male and female C57BLK/6 mice, we assessed responses of mean arterial pressure (MAP) and renal vascular resistance (RVR; Transonic flow probe) to acute bolus injections of ANG II (0.3-3.0 microg/kg iv) and phenylephrine (PE; 30-300 microg/kg) during low-, normal-, and high-sodium diets. The role of reactive oxygen species was determined by coadministration of tempol. ANG II type 1 and type 2 (AT1 and AT2) receptor and endothelial nitric oxide synthase (NOS3) expression were determined in dissected kidney vessels. While no difference was found on the low-sodium (LS) diet, MAP and RVR responses to ANG II were greater in males during the normal-sodium (NS) and high-sodium (HS) diets (e.g., RVR response at ANG II 3.0 microg/kg during NS: +329 +/- 22 vs. +271 +/- 28 mmHg.ml(-1).min, P = 0.029, effect size = 0.75). Tempol had no effect on the sex-dependent responses on any of the diets. On the LS diet, AT1 and AT2 receptor expression was higher in males. No sex differences were found on the NS diet. On the HS diet, AT1 was higher, and NOS3 expression was lower in males. Acute responses to ANG II are greater in male mice during NS and HS diets, which is, in part, related to differences in AT1, AT2, and NOS3 expression in kidney vessels. Mouse models will be useful to study the role of sex differences in ANG II sensitivity for cardiovascular and renal disease.
Schneider
Markus P
MP
Vascular Biology Center, Medical College of Georgia, Augusta, Georgia, USA. m.schneider@clinmed.gla.ac.uk
Wach
Paul F
PF
Durley
Melissa K
MK
Pollock
Jennifer S
JS
Pollock
David M
DM
D000316:Adrenergic alpha-Agonists / Q000494:pharmacology; D000804:Angiotensin II / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D001794:Blood Pressure; D003497:Cyclic N-Oxides / Q000494:pharmacology; D005260:Female; D016166:Free Radical Scavengers / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000502:physiology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D052250:Nitric Oxide Synthase Type III / Q000235:genetics / Q000378:metabolism; D010656:Phenylephrine / Q000008:administration & dosage / Q000494:pharmacology; D017382:Reactive Oxygen Species; D044140:Receptor, Angiotensin, Type 1 / Q000235:genetics / Q000378:metabolism; D044139:Receptor, Angiotensin, Type 2 / Q000235:genetics / Q000378:metabolism; D012727:Sex Characteristics; D012982:Sodium, Dietary / Q000494:pharmacology; D013113:Spin Labels
D000316:Adrenergic alpha-Agonists; D003497:Cyclic N-Oxides; D016166:Free Radical Scavengers; D017382:Reactive Oxygen Species; D044140:Receptor, Angiotensin, Type 1; D044139:Receptor, Angiotensin, Type 2; D012982:Sodium, Dietary; D013113:Spin Labels; D000804:Angiotensin II; D010656:Phenylephrine; D052250:Nitric Oxide Synthase Type III; C496315:Nos3 protein, mouse; C001803:tempol