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• W2020127623 abstract "1. Increased G i ‐protein‐mediated receptor–effector coupling in the vasculature of the spontaneously hypertensive rat (SHR) has been proposed as a contributing factor in the maintenance of elevated blood pressure. If increased G i ‐protein‐mediated activity plays an important role in hypertension in SHR, then inhibition of G i ‐proteins by pertussis toxin would be expected to decrease blood pressure in this genetic hypertensive model. To address this hypothesis, studies were undertaken comparing the cardiovascular effects of pertussis toxin in SHR and normotensive Wistar‐Kyoto (WKY) rats. 2. Spontaneously hypertensive and WKY rats were instrumented with radiotelemetry devices and blood pressure measurements were recorded in conscious rats. Following a single injection of pertussis toxin (10 μg/kg, i.v.), mean arterial blood pressure fell from 161±3 to 146±1 mmHg in the SHR and the effect was sustained for more than 2 weeks. In contrast, 10 μg/kg, i.v., pertussis toxin produced no significant effect on blood pressure in WKY rats (103±4 vs 101±5 mmHg). 3. In a separate study, SHR and WKY rats were administered 30 μg/kg, i.v., pertussis toxin or 150 μL/kg, i.v., saline and, 3–5 days later, rats were anaesthetized and instrumented to permit measurement of blood pressure and renal function. At this higher dose, pertussis toxin reduced blood pressure in both strains of rat, although the effect was markedly greater in SHR (approximately 40 mmHg decrease) compared with WKY rats (approximately 15 mmHg decrease). In SHR, pertussis toxin increased renal blood flow (from 5.7±0.3 to 7.5±0.8 mL/min per g kidney) and decreased renal vascular resistance (from 31±2 to 19±2 mmHg/mL per min per g kidney). In WKY rats, pertussis toxin had no significant effect on renal parameters. 4. Results from these studies indicate that a pertussis toxin‐sensitive G i ‐protein‐mediated pathway contributes to the maintenance of hypertension and elevated renal vascular tone in the SHR." @default.
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• W2020127623 date "1999-05-01" @default.
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• W2020127623 title "PERTUSSIS TOXIN‐SENSITIVE G‐PROTEINS AND REGULATION OF BLOOD PRESSURE IN THE SPONTANEOUSLY HYPERTENSIVE RAT" @default.
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• W2020127623 doi "https://doi.org/10.1046/j.1440-1681.1999.03058.x" @default.
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