Broccoli sprout Sulforaphane affected hemodynamics and aorta myogenic spontaneous rhythmic contraction in sanitized water uptake mice

Abstract

Drinking seawater erodes water source will lead to hemodynamic changes in cardiovascular system. The erosion affected vascular biomechanics further interrupt the blood supply in arterial network. In this study, we investigated the carotid arterial hemodynamics in salinity water fed mice, and the relative spontaneous contraction of aorta preparation. The biological effect of Broccoli sprout Sulforaphane was assessed in intake hemodynamic changes. Kunming mice were randomly divided into seawater feeding group, seawater + Sulforaphane group, freshwater feeding group, fresh water + Sulforaphane group. After 4 weeks of feeding, the pressure waveforms of common carotid artery were analyzed in vivo. The enhanced common carotid arterial pressures were calculated according to the breakpoint of systolic pressure rising phase. The ejection time was calculated according to the dicrotic notch. In vitro, the isolated aorta biomechanical features were tested on a micro stepping platform. The passive tension and relative myogenic spontaneous contraction were evaluated. The results indicated that in salinity water fed mice heart rate, ejection period were significantly accelerated. The systolic pressure breakpoint of the ascending phase was significantly increased; however, the central aortic pressure augment index was decreased. In vitro study, the isolated aorta preparations indicated remarkable myogenic spontaneous contraction in salinity water fed mice. The spontaneous contraction indicated a significant cycle pattern, the waveform cluster changes regularly in one cycle, maximal amplitude of myogenic autonomic contraction increased significantly. Spontaneous contraction became more active, however cycle duration shortened. In biological effect of Broccoli sprout supplement, Sulforaphane was effective in reducing the heart rate, prolonging ejection period, improving systolic pressure and pulse pressure amplitude in salinity water fed mice. We concluded that long-term salinity water uptake can form a new hypertension model in mice, which can affect the changes of carotid artery hemodynamics and local blood supply. The Broccoli sprout Sulforaphane can improve the high systolic blood pressure and ejection period of artery, and its mechanism needs further study.