Ten consanguine monogamous SHR couples (G1) were treated from their 5th to their 37th week of age with captopril, 50 mg/kg/day i.p. Male rats were treated without interruption. Treatment was withheld in female rats from delivery to weaning. They were compared to ten similar SHR couples which were only daily i.p. injected with the same volume of solvent. Second (G2) generation rats (untreated) were studied. In G1 rats, systolic blood pressure (SBP) and heart weight/body weight (HW/BW) ratio were decreased, while heart rate (HR) was not changed. Plasma renin activity remained unchanged at 37 weeks of age though the treatment was effective. Parental treatment did not reduce SBP and HW/BW ratio in G2 rats. This indicates that reduction of hypertension in SHR is not enough to prevent hypertension development in the offspring of the treated rats.
Six consanguine monogamous SHR couples (G1) were treated from 5 weeks of age on with an alpha blocker, nicergoline, 0.1 mg/kg/day i.p.. Male rats were treated without interruption; treatment was withheld in female rats from delivery to weaning. They were compare to six similar SHR couples who were only daily i.p. injected with the same volume of solvent in the same conditions as controls, as well as with naive (untreated) rats. Second (G2) and third (G3) generation rats (untreated) were studied. In G1 rats, systolic blood pressure (SBP), heart rate, heart weight/body weight ratio and bulbar noradrenaline content were decreased (compared to control or naive rats), while plasma renin activity (PRA) and hypothalamic noradrenaline content were not changed. In G2 rats, SBP and PRA were decreased, all other parameters being unchanged. No parameter was changed in G3 rats. This appears to be the first report of a preventive effect of antenatal treatment on the development of hypertension in SHR.
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