Effects of alkaline pH on the stimulation of glucose transport in rat skeletal muscle

Jian Ming Ren, Jang H. Youn, Eric A. Gulve, Erik J Henriksen, John O. Holloszy

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Alkaline pH has been reported to cause release of Ca2+ from skeletal muscle sarcoplasmic reticulum (SR). Elevation of sarcoplasmic Ca2+ concentration is thought to stimulate glucose transport in skeletal muscle. In this context, we examined the effect of alkaline pH (extracellular pH of 8.6) on 3-O-methylglucose transport in skeletal muscle. Incubation of rat epitrochlearis muscles at pH 8.6 for 45 min resulted in an approx. 3-fold increase in glucose transport activity, which was not affected by reducing Ca2+ concentration in the incubation medium and essentially completely blocked by 25 μM dantrolene, an inhibitor of SR Ca2+ release. In addition to stimulating glucose transport by itself, alkaline pH may partially inhibit the stimulation of sugar transport by insulin hypoxia and contractions, as the combined effect of alkaline pH and the maximal effect of insulin, contractions, or hypoxia on glucose transport are not different from the maximal effects of insulin, hypoxia, or contractions alone. The maximal effects of insulin and contractions, and of insulin and hypoxia, on glucose transport are normally additive in muscle. Alkaline pH completely prevented this additivity. In summary, our results show that alkaline pH stimulates glucose transport activity in skeletal muscle and provide evidence suggesting that this effect is mediated by Ca2+. They further show that alkaline pH blocks the additivity of the maximal effects of insulin and contractions or hypoxia suggesting that alkaline pH may partially inhibit the stimulation of glucose transport by insulin, contraction and hypoxia.

Original languageEnglish (US)
Pages (from-to)199-204
Number of pages6
JournalBBA - Biomembranes
Volume1145
Issue number2
DOIs
StatePublished - Feb 9 1993
Externally publishedYes

Fingerprint

Muscle
Rats
Skeletal Muscle
Insulin
Glucose
Sarcoplasmic Reticulum
3-O-Methylglucose
Dantrolene
Sugars
Muscles
Hypoxia

Keywords

  • 3-O-Methylglucose
  • Epitrochlearis muscle
  • Hypoxia
  • Insulin
  • Muscle contraction

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology

Cite this

Effects of alkaline pH on the stimulation of glucose transport in rat skeletal muscle. / Ren, Jian Ming; Youn, Jang H.; Gulve, Eric A.; Henriksen, Erik J; Holloszy, John O.

In: BBA - Biomembranes, Vol. 1145, No. 2, 09.02.1993, p. 199-204.

Research output: Contribution to journalArticle

Ren, Jian Ming ; Youn, Jang H. ; Gulve, Eric A. ; Henriksen, Erik J ; Holloszy, John O. / Effects of alkaline pH on the stimulation of glucose transport in rat skeletal muscle. In: BBA - Biomembranes. 1993 ; Vol. 1145, No. 2. pp. 199-204.
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AB - Alkaline pH has been reported to cause release of Ca2+ from skeletal muscle sarcoplasmic reticulum (SR). Elevation of sarcoplasmic Ca2+ concentration is thought to stimulate glucose transport in skeletal muscle. In this context, we examined the effect of alkaline pH (extracellular pH of 8.6) on 3-O-methylglucose transport in skeletal muscle. Incubation of rat epitrochlearis muscles at pH 8.6 for 45 min resulted in an approx. 3-fold increase in glucose transport activity, which was not affected by reducing Ca2+ concentration in the incubation medium and essentially completely blocked by 25 μM dantrolene, an inhibitor of SR Ca2+ release. In addition to stimulating glucose transport by itself, alkaline pH may partially inhibit the stimulation of sugar transport by insulin hypoxia and contractions, as the combined effect of alkaline pH and the maximal effect of insulin, contractions, or hypoxia on glucose transport are not different from the maximal effects of insulin, hypoxia, or contractions alone. The maximal effects of insulin and contractions, and of insulin and hypoxia, on glucose transport are normally additive in muscle. Alkaline pH completely prevented this additivity. In summary, our results show that alkaline pH stimulates glucose transport activity in skeletal muscle and provide evidence suggesting that this effect is mediated by Ca2+. They further show that alkaline pH blocks the additivity of the maximal effects of insulin and contractions or hypoxia suggesting that alkaline pH may partially inhibit the stimulation of glucose transport by insulin, contraction and hypoxia.

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