Maternal Renovascular Hypertensive Rats Treatment With Hydrogen Sulfide Increased the Methylation of AT1b Gene in Offspring

Abstract

BACKGROUND

A large number of studies have shown hypertension of offspring in adulthood is related to parental health during pregnancy. Hydrogen sulfide (H₂S) could relax placental vasculature and improve intrauterine growth restriction. In the present study, we want to observe the effect of H₂S on the fetal programming of renovascular hypertension, a rat model of secondary hypertension.

METHODS

Renovascular hypertension was induced by 2-kidney-1-clip, their adult pups were used to evaluate basal blood pressure. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were measured noninvasively by tail-cuff plethysmography in conscious offspring; HE staining was used to observe morphology of kidney; the protein expression of angiotensin II receptor 1 (AT1R) tested by western blot; methylation of angiotensin II receptor 1b (AT1b) gene used pBLUE-T-cloning to check.

RESULTS

The SBP and DBP in the offspring of renovascular hypertensive dams were higher than those in control group. Moreover, interstitial inflammatory infiltration was significant in the kidney and the protein expression of AT1R was also increased in the offspring of renovascular hypertensive dams. Conversely, methylation of AT1b promoter (U01033 277–1611) decreased in the first 3 CG sites. Either prenatal or postnatal treatment with H₂S could increase the methylation of AT1b and downregulate AT1R expression then improve the blood pressure.

CONCLUSION

These results suggested that parental secondary hypertension-induced kidney damage that elevated basal blood pressure in adult offspring. Prenatal or postnatal administration with H₂S induced improved effect accompanied by an increased methylation of AT1b gene then downregulated protein of AT1R in offspring.

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