Cited by 61Pancreatic function and diabetesCalcium signaling and nucleotide metabolismIon channel regulation and function

Nutrient secretagogues induce bimodal early changes in cytoplasmic calcium of insulin-releasing ob/ob mouse beta-cells.

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Gylfe, E·1988·Journal of Biological Chemistry

Abstract

The cytoplasmic calcium concentration (Ca2+i) was measured in suspensions of fura-2 loaded mouse pancreatic beta-cells by continuously recording the 340/380 nm fluorescence excitation ratio. When the glucose concentration was raised from 3 to 20 mM, there was an initial lowering of Ca2+i followed by a sustained increase. Whereas the reduction in Ca2+i was related to the extracellular glucose concentration in a hyperbolic manner, the increasing component exhibited a sigmoidal dose-response relationship. Both effects became maximal at 15-20 mM of the sugar. Qualitatively similar bimodal Ca2+i responses were obtained with 30 mM mannose, 2 mM alpha-ketoisocaproic acid, 10 mM leucine, and 10 mM metabolism-stimulating leucine analogue beta-2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid. Fructose (30 mM) had virtually no effect on Ca2+i in the presence of extracellular Ca2+, and 10 mM arginine induced only a rise. The results indicate that nutrient secretagogues stimulate both the entry of Ca2+ into the beta-cells and its elimination from the cytoplasm by processes like organelle sequestration and outward transport. Consequently, the Ca2+i level determining insulin secretion results from the balance between two opposing actions.

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Crossref · 10.1016/s0021-9258(18)68305-x

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  • These data are consistent with stimulated sequestration and outward transport of Ca2+ being saturated at lower glucose concentrations in alpha-cells than in beta-cells.

    “These data are consistent with stimulated sequestration and outward transport of Ca 2ϩ (14,20,21) being saturated at lower glucose concentrations in ␣-cells (14) than in ␤-cells (21).”

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Authors
Gylfe, E.
Affiliations
Uppsala University (SE)
Corresponding author
Gylfe, E
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1988-09
Volume
263
Issue
27
Pages
13750-13754
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1576072320
Cited by
61
References
41
Citations by year
2023: 1 · 2021: 1 · 2015: 3 · 2013: 1 · 2012: 1
FWCI
4.74
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
intracellular calcium, insulin secretion, pancreatic beta cells, glucose, calcium influx, calcium efflux, leucine, alpha-ketoisocaproate, mannose, fructose, L-arginine, ob/ob mice, fura-2
MeSH terms
Insulin Secretion, Amino Acids, Amino Acids, Cyclic, Animals, Arginine, Calcium, Cytoplasm, Dose-Response Relationship, Drug, Glucose, Glutamine, Insulin, Islets of Langerhans, Keto Acids, Leucine, Mice, Obese, Obesity, Mice

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