Abstract
Nutritional and environmental factors contribute to the development of salt sensitive hypertension. DNA methylation, the most extensively studied epigenetic marker, may have more stable, longer lasting effects than transient changes in gene expression. Protein malnutrition during pregnancy causes prenatal programmed salt sensitive hypertension via aberrant DNA methylation of the angiotensin receptor, which is induced by exposure to excessive glucocorticoid in the fetal hypothalamus. In adults, salt sensitive hypertension induced by obesity is attributable to increased renal activity of Rac1 and mineralocorticoid receptor (MR) pathway, and adverse prenatal exposure induces transgenerational hypertension through activation of Rac1 and MR pathway by an epigenetic regulated mechanism. Finally, DNA methylation of Klotho in aged kidneys leads to a reduction in the circulating levels of soluble Klotho, and in turn, resulting in the activation of noncanonical Wnt5a and RhoA signaling in the vasculature and the development of aging associated salt sensitive hypertension. These findings indicate that epigenetic modulation has an important role in the development of salt sensitive hypertension throughout life.
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