Endogenous sodium pump inhibitors and age-associated increases in salt sensitivity of blood pressure in normotensives

被引:47
作者
Anderson, David E. [1 ,2 ]
Fedorova, Olga V. [1 ]
Morrell, Christopher H. [1 ,3 ]
Longo, Dan L. [2 ]
Kashkin, Vladimir A. [1 ]
Metzler, Jessica D. [2 ]
Bagrov, Alexei Y. [1 ]
Lakatta, Edward G. [1 ]
机构
[1] NIA, Cardiovasc Sci Lab, Baltimore, MD 21224 USA
[2] NIA, Clin Res Branch, Intramural Res Program, Gerontol Res Ctr, Baltimore, MD 21224 USA
[3] Loyola Coll, Dept Math Sci, Baltimore, MD 21210 USA
关键词
marinobufagenin; ouabain; hypertension;
D O I
10.1152/ajpregu.00782.2007
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Factors that mediate increases in salt sensitivity of blood pressure with age remain to be clarified. The present study investigated 1) the effects of high-NaCl intake on two Na pump inhibitors, endogenous ouabain (EO) and marinobufagenin (MBG), in middle-aged and older normotensive Caucasian women; and 2) whether individual differences in EO and MBG are linked to variations in sodium excretion or salt sensitivity. A change from 6 days of a lower (0.7 mmol(.)kg(-1.)day(-1))-to 6 days of a higher (4 mmol(.)kg(-1.)day(-1))-NaCl diet elicited a sustained increase in MBG excretion that directly correlated with an increase in the fractional Na excretion and was inversely related to age and to an age-dependent increase in salt sensitivity. In contrast, EO excretion increased only transiently in response to NaCl loading and did not vary with age or correlate with fractional Na excretion or salt sensitivity. A positive correlation of both plasma and urine levels of EO and MBG during salt loading may indicate a casual link between two Na pump inhibitors in response to NaCl loading, as observed in animal models. A linear mixed-effects model demonstrated that age, dietary NaCl, renal MBG excretion, and body mass index were each independently associated with systolic blood pressure. Thus, a sustained increase in MBG in response to acutely elevated dietary NaCl is inversely linked to salt sensitivity in normotensive middle-aged and older women, and a relative failure of MBG elaboration by these older persons may be involved in the increased salt sensitivity with advancing age.
引用
收藏
页码:R1248 / R1254
页数:7
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