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Taurine amplifies renal kallikrein and prevents salt-induced hypertension in Dahl rats.

Abstract：

OBJECTIVE:To determine whether taurine reduces blood pressure by stimulating the renal kallikrein-kinin system. METHODS:The effects of taurine on blood pressure, urinary kallikrein activity and renal kallikrein gene expression were investigated in Dahl salt-sensitive (Dahl-S) rats. The specificity of the action of taurine was verified by comparison with the action of beta-alanine, a carboxylic analogue of taurine. The effect of co-administration of the specific bradykinin B2 receptor antagonist Hoe 140 was also examined. RESULTS:Administration of taurine (3% in drinking water) for 4 weeks retarded the development of salt (4% sodium chloride diet)-induced hypertension. Systolic blood pressure at the end of the experiment was significantly higher in control rats than in taurine-treated rats. Urinary sodium excretion was not decreased by the reduction in blood pressure. The heart weight:body weight ratio was significantly lower, and urinary volume and kallikrein excretion were significantly higher, in taurine-treated rats. Renal kallikrein gene expression at weeks 1 and 4 was higher in taurine-treated rats. Systolic blood pressure 3 and 4 weeks after the administration of beta-alanine was slightly, but not significantly, lower than that of untreated rats on a high-salt diet, and was accompanied by a significantly lower body weight. Urinary kallikrein excretion decreased with a high-salt diet regardless of beta-alanine administration. Continuous systemic administration of Hoe 140 did not cause any significant alteration in blood pressure in Dahl-S rats that received taurine with a high-salt diet. Taurine also showed a renoprotective effect, as judged by a reduction in proteinuria. CONCLUSION:These results suggest that taurine is an effective antihypertensive agent for salt-induced hypertension. Although taurine activated renal kallikrein, further studies are required to confirm the participation of activated kallikrein in the antihypertensive, cardioprotective and renoprotective effects of taurine.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Ideishi M,Miura S,Sakai T,Sasaguri M,Misumi Y,Arakawa K

subject

Has Abstract

pub_date

1994-06-01 00:00:00

pages

653-61

issue

eissn

0263-6352

issn

1473-5598

journal_volume

pub_type

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Taurine amplifies renal kallikrein and prevents salt-induced hypertension in Dahl rats.