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Unique and Shared Metabolic Regulation in Clonal β-cells and Primary Islets Derived from Rat Revealed by Metabolomics Analysis.

Author:
  • Peter Spégel
  • Lotta Andersson
  • Petter Storm
  • Vladimir Sharoyko
  • Isabel Göhring
  • Anders Rosengren
  • Hindrik Mulder
Publishing year: 2015
Language: English
Pages: 1995-2005
Publication/Series: Endocrinology
Volume: 156
Issue: 6
Document type: Journal article
Publisher: Endocrine Society

Abstract english

As models for β-cell metabolism, rat islets are, to some extent, a, heterogeneous cell-population stressed by the islet isolation procedure, while rat-derived clonal β-cells exhibit a tumor-like phenotype. To describe to what extent either of these models reflect normal cellular metabolism, we compared metabolite profiles and gene expression in rat islets and the INS-1 832/13 line, a widely used clonal β-cell model. We found that insulin secretion and metabolic regulation provoked by glucose were qualitatively similar in these β-cell models. However, rat islets exhibited a more pronounced glucose-provoked increase of glutamate, glycerol-3-phosphate, succinate and lactate levels while INS-1 832/13 cells showed a higher glucose-elicited increase in glucose-6-phosphate, alanine, isocitrate, and α-ketoglutarate levels. Glucose induced a decrease in levels of γ-aminobutyrate (GABA) and aspartate in rat islets and INS-1 832/13 cells, respectively. Genes with cellular functions related to proliferation and the cell cycle were more highly expressed in the INS-1 832/13 cells. Most metabolic pathways that were differentially expressed included GABA metabolism, in line with altered glucose responsiveness of GABA. Also, lactate dehydrogenase A, which is normally expressed at low levels in mature β-cells, was more abundant in rat islets than in INS-1 832/13 cells, confirming the finding of elevated glucose-provoked lactate production in the rat islets. Overall, our results suggest that metabolism in rat islets and INS-1 832/13 cells is qualitatively similar, albeit with quantitative differences. Differences may be accounted for by cellular heterogeneity of islets and proliferation of the INS-1 832/13 cells.

Keywords

  • Endocrinology and Diabetes

Other

Published
  • Molecular Metabolism
  • Diabetes and Endocrinology
  • Islet patophysiology
  • ISSN: 0013-7227
Peter Spegel
E-mail: peter.spegel [at] chem.lu.se

Researcher

Centre for Analysis and Synthesis

1

Lund University Diabetes Centre, CRC, SUS Malmö, Entrance 72, House 91:12. SE-205 02 Malmö. Telephone: +46 40 39 10 00