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  • Transport Processes, Metabolism and Endocrinology; Kidny, Gastrointestinal Tract, and Exocrine Glands
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The stimulus-secretion coupling of glucose-induced insulin release

XXVIII. Effect of glucose on Na+ fluxes in isolated islets

  • 18 Accesses

  • 51 Citations

Abstract

The effect of glucose upon the handling of22Na+ by pancreatic islets was investigated. Using a triple-isotope technique, the apparent concentration of Na+ in islet cells was estimated at 50–75 mM. The pattern of22Na+ efflux from perifused islets indicates that this intracellular Na+ load is compartmentalized among a small, possibly organelle-bound pool characterized by a low fractional turnover rate (5%/min) and a large, presumably cystosolic pool displaying a much higher fractional turnover rate (20–34%/min). Glucose provokes a rapid, pronounced and sustained increase in the fractional outflow rate of Na+ across the plasma membrane and, under steady-state conditions, moderately reduces the concentration of Na+ inside the islet cells. The glucose-induced increase in Na+ outflow rate, which is also observed in response to glyceraldehyde and does not require the presence of extracellular Ca2+, might be mediated, in part at least, by an ouabain-resistant ionophoretic system. The experimental data suggest that glucose also increases the inward transport of Na+ in islet cells by a veratridine-sensitive channel.

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Kawazu, S., Boschero, A.C., Delcroix, C. et al. The stimulus-secretion coupling of glucose-induced insulin release. Pflugers Arch. 375, 197–206 (1978). https://doi.org/10.1007/BF00584244

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Key words

  • Pancreatic islets
  • Na+−K+
  • Ouabain
  • Veratridine
  • Glucose
  • Insulin