Objective To explore the relationship between endogenous ouabain and the pathogenesis of hypertension. Methods ① Sixteen Sprague Dawley (SD) rats were selected and randomly divided into two groups, and then the rats were injected with ouabain in dosage of 20μg/kg.d and normal saline (NS), respectively. The indirect systolic blood pressure of all the rats were recorded once a week. ② Twenty five 1k1c (one kidney and one clipped) hypertensive rats were established and injected randomly with anti ouabain antibody, normal rabbit IgG and normal saline, respectively. The direct blood pressure of all the 1klc hypertensive rats were recorded by cannulated carotid artery for 3h after administration. Results The systolic blood pressure of rats injected with ouabain began to increase 2 weeks after ouabain administration and increased significantly at 6 weeks compared with NS group (17.7±1.2)kPa vs (15.4±1.1)kPa, P <0.01).Anti ouabain antibody could significantly decrease the blood pressure of 1k1c rats, while the normal rabbit IgG could not. Conclusion The results of this study indicate that endogenous ouabain might be one of the pathogenetic factors of hypertension.
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