Insulin activates Na +/H + exchanger 3

Biphasic response and glucocorticoid dependence

Jelena Klisic, Ming C Hu, Vera Nief, Livia Reyes, Daniel Fuster, Orson W Moe, Patrice M. Ambühl

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

Insulin is an important regulator of renal salt and water excretion, and hyperinsulinemia has been implicated to play a role in hypertension. One of the target proteins of insulin action in the kidney is Na +/H + exchanger 3 (NHE3), a principal Na + transporter responsible for salt absorption in the mammalian proximal tubule. The molecular mechanisms involved in activation of NHE3 by insulin have not been studied so far. In opossum kidney (OK) cells, insulin increased Na +/H + exchange activity in a time- and concentration-dependent manner. This effect is due to activation of NHE3 as it persisted after pharmacological inhibition of NHE1 and NHE2. In the early phase of stimulation (2-12 h), NHE3 activity was increased without changes in NHE3 protein and mRNA. At 24 h, enhanced NHE3 activity was accompanied by an increase in total and cell surface NHE3 protein and NHE3 mRNA abundance. All the effects of insulin on NHE3 activity, protein, and mRNA were amplified in the presence of hydrocortisone. These results suggest that insulin stimulates renal tubular NHE3 activity via a biphasic mechanism involving post-translational factors and an increase in NHE3 gene expression and the effects are dependent on the permissive action of hydrocortisone.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Renal Physiology
Volume283
Issue number3 52-3
StatePublished - Sep 2002

Fingerprint

Sodium-Hydrogen Antiporter
Glucocorticoids
Insulin
Kidney
Messenger RNA
Hydrocortisone
Proteins
Salts
Opossums
Hyperinsulinism
Pharmacology

Keywords

  • Hormones
  • Kidney
  • Sodium transport

ASJC Scopus subject areas

  • Physiology

Cite this

Insulin activates Na +/H + exchanger 3 : Biphasic response and glucocorticoid dependence. / Klisic, Jelena; Hu, Ming C; Nief, Vera; Reyes, Livia; Fuster, Daniel; Moe, Orson W; Ambühl, Patrice M.

In: American Journal of Physiology - Renal Physiology, Vol. 283, No. 3 52-3, 09.2002.

Research output: Contribution to journalArticle

Klisic, Jelena ; Hu, Ming C ; Nief, Vera ; Reyes, Livia ; Fuster, Daniel ; Moe, Orson W ; Ambühl, Patrice M. / Insulin activates Na +/H + exchanger 3 : Biphasic response and glucocorticoid dependence. In: American Journal of Physiology - Renal Physiology. 2002 ; Vol. 283, No. 3 52-3.
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