Dietary fatty acid modulates glomerular atrial natriuretic peptide receptor

Midori Awazu, Aida Yared, Larry L. Swift, Richard L. Hoover, Iekuni Ichikawa

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Modification of dietary fatty acid (FA) has been shown to affect the incidence of hypertension and coronary artery disease. We studied whether these effects involve changes in the receptor characteristics of vasoactive substance. Characteristics of atrial natriuretic peptide (ANP) receptors were examined in glomeruli isolated from rats fed a diet containing 5% in weight ω6, 5% ω3, 20% ω6, 20% ω3 polyunsaturated FA or 20% saturated FA (SFA) for >4 weeks. The FA composition of phospholipids in isolated glomeruli showed an elevation in 20:4 ω6 (arachidonic acid, AA) in 5% ω6, 20% ω6 and 20% SFA, and elevations in 20:5 ω3 (eicosapentaenoic acid, EPA) in 5% ω3 and 20% ω3 groups. The radioligand binding study revealed: (1) in 20% FA group, receptor density (Ro, fmol/mg prot) of ANP was significantly decreased compared to 5% group (262 ±13, n = 8 to 120 ± 13, n = 12) without changes in equilibrium dissociation constant (KD), (2) among high FA (20%) groups, type of FA was essential for determining Ro; higher ω6 was associated with a lower ANP Ro (177 ± 11 vs. 103 ± 3 fmol/mg prot, P < 0.05) and KD (0.43 ± .04 vs. 0.27 ± .02 nM, P < 0.05). To examine whether the alteration in receptor characterisitics is mediated by FA, effects of FA were examined in vitro. In cultured mesangial cells, AA, but not EPA, decreased Ro of ANP receptors (48.7 ± 4.8% of control, P < 0.05) without affecting KD. AA-induced down-regulation of ANP receptor was not accompanied by changes in ANP-induced cGMP generation. These results from ex vivo and in vitro studies suggest that dietary FA modulates the glomerular C receptor of ANP. The observed effect of FA on glomerular ANP receptor characteristics raises the possibility of the existence of a novel mechanism through which dietary FA intake affects the cardiovascular physiology and pathophysiology through affecting the receptor characterisitcs of vasoactive substances.

本文言語English
ページ(範囲)265-271
ページ数7
ジャーナルKidney international
42
2
DOI
出版ステータスPublished - 1992 8月
外部発表はい

ASJC Scopus subject areas

  • 腎臓病学

フィンガープリント

「Dietary fatty acid modulates glomerular atrial natriuretic peptide receptor」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル