期刊
JOURNAL OF NUTRITIONAL BIOCHEMISTRY
卷 115, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jnutbio.2023.109281
关键词
Salt memory; Blood pressure; Renal injury; Epigenetics; Inflammatory activation
Transient high salt intake leads to salt memory, causing persistent elevation of blood pressure and kidney damage even after returning to a normal diet. Epigenetic changes and persistent inflammatory activation play important roles in mediating salt memory and its effects on hypertension and renal damage in salt-sensitive rats.
Transient high salt intake causes a sustained increase in blood pressure (BP) even after returning to a normal-salt diet, a phenomenon known as salt memory. However, the molecular mechanisms of this phenomenon remain to be elucidated. Dahl salt-sensitive (SS) rats were fed a high-salt (8% NaCl) or high-salt diet and treated with drugs for 8 to 16 weeks and then returned to a normal-salt diet for 3 months. This study investigated the molecular mechanisms of salt memory and its mediation of SS hypertension and renal damage. We show that transient high salt intake caused persistent elevation of BP and exacerbation of kidney damage in Dahl SS rats even after returning to a normal-salt diet. Both epigenetic changes and inflammatory activation also persisted after resumption of a normal diet. Arterial BP, renal injury and the inflammatory response returned to normal levels in rats administered mycophenolate mofetil (MMF) during the 8-week period of high salt intake, resulting in the disappearance of salt memory. However, the vasodilator hydralazine did not ameliorate kidney damage or inflammatory activation, although it decreased BP to control levels. Transient high salt intake increased histone 3 lysine 4 monomethylation (H3K4me1) levels at the nuclear factor KB (NF -KB) subunit p65 promoter in SS rats, promoting p65 gene transcription and NF -KB activation and further leading to a series of inflammatory responses. Our findings demonstrate that transient high salt-induced epigenetic changes and persistent inflammatory activation play important roles in salt memory and its mediation of SS hypertension and renal damage.(c) 2023 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )
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