Antihypertensive compounds that modulate the Na-K pump.

Abstract:

:A primary impairment of the kidney sodium excretion has been documented both in hypertensive patients (EH) and genetic animal models (Milan hypertensive rat [MHS]) carrying mutations of the cytoskeletal protein adducin and/or increased plasma levels of endogenous ouabain (EO). Ouabain (OU) itself induces hypertension in rats and both OU and mutated adducin activate the renal Na/K-ATPase function both in vivo and in cultured renal cells (NRK). A new antihypertensive agent, PST 2238, able to selectively interact with these alterations has been developed. PST lowers blood pressure (BP) by normalizing the expression and activity of the renal Na-K pump selectively in those rat models carrying the adducin mutation (MHS) and/or increased EO levels (OS) at oral doses of 0.1-10 micro g/kg. In NRK cells either transfected with mutated adducin or incubated with 10(-9) M OU, PST normalizes the Na-K pump activity. Recently, an association between EO and cardiac complications has been observed in both EH and rat models consistent with a prohypertrophic activity of OU. OS rats showed a 10% increase of left ventricle and kidney weights as compared with controls, and PST 2238 (1 micro g/kg OS) prevented both ventricle and renal hypertrophy. This effect was associated with the ability of PST to antagonize the OU-dependent activation of growth-related genes, in the membrane subdomains of caveolae. In conclusion, PST is a new antihypertensive agent that may prevent cardiovascular complications associated with hypertension through the selective modulation of the Na-K pump function.

journal_name

Ann N Y Acad Sci

authors

Ferrari P,Ferrandi M,Torielli L,Barassi P,Tripodi G,Minotti E,Molinari I,Melloni P,Bianchi G

doi

10.1111/j.1749-6632.2003.tb07284.x

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

694-701

eissn

0077-8923

issn

1749-6632

journal_volume

986

pub_type

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