Abstract
In this study we investigated the role of endogenous endothelin in the cardiovascular response to acute stress, ie mild footshocks in conscious rats. Footshock-stress significantly increased mean arterial pressure and heart rate (P < 0.05). Peripheral or intracerebroventricular (IVT) administration of BQ 788, a selective antagonist of ETB receptor, did not alter pressor response to footshocks. Intraperitoneal injections of BQ 123 (1 mg/kg), a selective antagonist of the ETA-receptor, had a tendency to decrease, while BQ 123 (203 ng/5 μl) IVT administration significantly reduced the pressor response to footshocks (−12 mm Hg, P < 0.001). Neither ETA nor ETB antagonists, when injected centrally or peripherally, altered basal blood pressure or heart rate. Our results may indicate a role of brain endothelin in the sympathetic mediated cardiovascular response to stress, via stimulation of ETA recertor.
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Acknowledgements
This work was supported by CDCH grant GP-06–10–4343–99 and IIF-05–96, Universidad Central de Venezuela.
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Garrido, M., Israel, A. Role of endothelin in stress-induced hypertension. J Hum Hypertens 16 (Suppl 1), S29–S33 (2002). https://doi.org/10.1038/sj.jhh.1001338
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DOI: https://doi.org/10.1038/sj.jhh.1001338