title: Role of the renin-angiotensin-aldosterone system in the enhancement of salt sensitivity caused by prenatal protein restriction in stroke-prone spontaneously hypertensive rats.
abstract: We previously demonstrated that maternal protein restriction during pregnancy enhanced salt sensitivity and shortened life span in stroke-prone spontaneously hypertensive rats (SHRSP). The present study was conducted to investigate the participation of the renin-angiotensin-aldosterone system in the development of salt sensitivity in the offspring of dams fed a low-protein diet during pregnancy. We used SHRSP offspring from dams fed a 20% casein diet (CN) or a 9% casein diet (LP) during pregnancy. The CN and LP SHRSP offspring were further subdivided into tap-water-drinking and 1%-saline-drinking groups from the postnatal 10th week. A remarkable elevation in blood pressure in response to salt loading was observed in the LP SHRSP offspring. The protein levels of CYP11B2, an enzyme for aldosterone synthesis, were markedly elevated in response to salt loading in the kidneys of LP offspring. Treatment of the LP offspring with an aldosterone receptor antagonist prevented the blood pressure from elevating and lengthened the average life span in LP offspring in response to the drinking of 1% saline. No difference in the activity of angiotensin-converting enzyme or in the protein level of the angiotensin type 1 receptor was found between the CN and LP offspring in either the tap-water-drinking or saline-drinking conditions. In conclusion, the increment of aldosterone production in response to high-salt loading may contribute to the elevated salt sensitivity of the offspring of protein-restricted dams.
authors.affiliation: Department of Food Science and Nutrition, Faculty of Agriculture, Kinki University, Nakamachi, Nara, Japan.
authors.forename: Lila
authors.initials: L
authors.lastname: Otani
authors.forename: Naoya
authors.initials: N
authors.lastname: Sugimoto
authors.forename: Misa
authors.initials: M
authors.lastname: Kaji
authors.forename: Mariko
authors.initials: M
authors.lastname: Murai
authors.forename: Sue-Joan
authors.initials: SJ
authors.lastname: Chang
authors.forename: Hisanori
authors.initials: H
authors.lastname: Kato
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Murakami
mesh_terms: D000450:Aldosterone / Q000378:metabolism; D000818:Animals; D019405:Cytochrome P-450 CYP11B2 / Q000378:metabolism; D018753:Diet, Protein-Restricted; D005260:Female; D006973:Hypertension / Q000209:etiology / Q000378:metabolism / Q000503:physiopathology*; D007668:Kidney / Q000378:metabolism; D008297:Male; D011247:Pregnancy; D039401:Prenatal Nutritional Physiological Phenomena / Q000502:physiology*; D051381:Rats; D011918:Rats, Inbred SHR; D044140:Receptor, Angiotensin, Type 1 / Q000378:metabolism; D044139:Receptor, Angiotensin, Type 2 / Q000378:metabolism; D012084:Renin-Angiotensin System / Q000502:physiology*; D012965:Sodium Chloride
chemical_list: D044140:Receptor, Angiotensin, Type 1; D044139:Receptor, Angiotensin, Type 2; D012965:Sodium Chloride; D000450:Aldosterone; D019405:Cytochrome P-450 CYP11B2