Fructose increases the activity of sodium hydrogen exchanger in renal proximal tubules that is dependent on ketohexokinase

Takahiro Hayasaki, Takuji Ishimoto, Tomohito Doke, Akiyoshi Hirayama, Tomoyoshi Soga, Kazuhiro Furuhashi, Noritoshi Kato, Tomoki Kosugi, Naotake Tsuboi, Miguel A. Lanaspa, Richard J. Johnson, Shoichi Maruyama, Kenji Kadomatsu

研究成果: Article査読

10 被引用数 (Scopus)

抄録

High fructose intake has been known to induce metabolic syndrome in laboratory animals and humans. Although fructose intake enhances sodium reabsorption and elevates blood pressure, role of fructose metabolism in this process has not been studied. Here we show that by ketohexokinase — the primary enzyme of fructose — is involved in regulation of renal sodium reabsorption and blood pressure via activation of the sodium hydrogen exchanger in renal proximal tubular cells. First, wild-type and ketohexokinase knockout mice (Male, C57BL/6) were fed fructose water or tap water with or without a high salt diet. Only wild type mice fed the combination of fructose water and high salt diet displayed increased systolic blood pressure and decreased urinary sodium excretion. In contrast, ketohexokinase knockout mice were protected. Second, urinary sodium excretion after intraperitoneal saline administration was reduced with the decreased phosphorylation of sodium hydrogen exchanger 3 in fructose-fed WT; these changes were not observed in the ketohexokinase knockout mice, however. Third, knockdown of ketohexokinase attenuated fructose-mediated increases of NHE activity with decreased cAMP levels in porcine renal proximal tubular cells (LLC-PK1). In conclusion, fructose metabolism by ketohexokinase increases sodium hydrogen exchanger activity in renal proximal tubular cells via decreased intracellular cAMP level, resulting in increased renal sodium reabsorption and blood pressure in mice.

本文言語English
ページ(範囲)54-62
ページ数9
ジャーナルJournal of Nutritional Biochemistry
71
DOI
出版ステータスPublished - 2019 9月

ASJC Scopus subject areas

  • 内分泌学、糖尿病および代謝内科学
  • 生化学
  • 分子生物学
  • 栄養および糖尿病
  • 臨床生化学

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