Brain renin-angiotensin system: fetal epigenetic programming by maternal protein restriction during pregnancy

Reproductive Sciences
Ravi GoyalL D Longo

Abstract

Maternal protein malnutrition during pregnancy can lead to significant alterations in the systemic renin-angiotensin system (RAS) in the fetus. All components of the RAS are present in brain and may be altered in many disease states. Importantly, these disorders are reported to be of higher incidence in prenatally malnourished individuals. In the current study, we tested the hypothesis that antenatal maternal low protein diet (MLPD) leads to epigenetic changes and alterations in gene expression of brain RAS of the mouse fetus. Mice dams were given control and 50% MLPD during second half of the gestation. We analyzed messenger RNA (mRNA), microRNA (miRNA), promoter DNA methylation, and protein expression of various RAS genes in the fetal offspring. As a consequence of 50% MLPD, fetal brains showed increased mRNA expression of angiotensinogen and angiotensin converting enzyme-1 (ACE-1), with a decrease in mRNA levels of angiotensin II type-2 (AT2) receptors. In contrast, while angiotensinogen protein expression was unaltered, the protein levels of ACE-1 and AT2 receptor genes were significantly reduced in the fetal brain from the MLPD dams. Our results also demonstrated hypomethylation of the CpG islands in the promoter regions o...Continue Reading

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