Abstract
1. The purpose of the present study was to evaluate the blood pressure (BP) response, the BP and heart rate (HR) components of the startle reaction and the structure of the carotid artery and the aorta during chronic infusion of angiotensin (Ang) II in Fischer 344 (F344) compared with Wistar Kyoto (WKY) rats, two in-bred normotensive contrasted strains. 2. Osmotic mini-pumps filled with saline vehicle or AngII (120 ng/kg per min) were implanted subcutaneously in 8-week-old normotensive rats and infused for 4 weeks in F344 rats (saline, n = 10; AngII, n = 10) and WKY rats (saline, n = 10; AngII, n = 9). Basal BP, HR and the responses to an acoustic startle stimulus (duration 0.7 s, 115 dB) were recorded in conscious rats. The structure of the carotid artery and aorta was determined in 4% formaldehyde-fixed arteries. 3. Compared with WKY rats, vehicle-treated F344 rats had lower bodyweight (BW; 266 +/- 7 vs 299 +/- 9 g; P < 0.05) and heart weight (0.80 +/- 0.02 vs 0.98 +/- 0.04 g; P < 0.05) and higher aortic systolic BP (SBP; 131 +/- 1 vs 123 +/- 5 mmHg; P < 0.001) and diastolic BP (98 +/- 3 vs 89 +/- 2 mmHg; P < 0.001). In F344 rats, compared with the WKY rats, the wall thickness/BW ratio was increased in the carotid artery (156...Continue Reading
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