Increased β-cell mass by islet transplantation and PLAG1 overexpression causes hyperinsulinemic normoglycemia and hepatic insulin resistance in mice

Jeroen Declercq, Anujith Kumar, Janna A. Van Diepen, Irene O C M Vroegrijk, Conny Gysemans, Caterina Di Pietro, Peter J. Voshol, Chantal Mathieu, Nadine Ectors, Wim J M Van De Ven, Catherine M. Verfaillie

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Abstract

OBJECTIVE - It is believed that an organism remains normoglycemic despite an increase in the β-cell mass because of decreased insulin production by β-cells on a per-cell basis. However, some transgenic mouse models with β-cell hyperplasia suggest that insulin production remains excessive and that normoglycemia is maintained by insulin resistance. METHODS - Here, we investigated the effect of an increased β-cell mass on glycemia and insulin resistance by grafting excess normal islets in normoglycemic mice, as well as using targeted PLAG1 expression in β-cells, which leads to β-cell expansion. RESULTS - In both models, fasting plasma insulin levels were increased, even though animals were normoglycemic. After an intraperitoneal glucose tolerance test, plasma insulin levels increased, which was associated with improved glucose clearing. Under these conditions, normoglycemia is maintained by hepatic insulin resistance as demonstrated by hyperinsulinemic euglycemic clamp experiments. CONCLUSIONS - In conclusion, we demonstrate that when excess β-cells are grafted, insulin production on a per β-cell basis is not sufficiently decreased, leading to hyperinsulinemia and hepatic insulin resistance. This observation might be important for the design of stem cell-based islet replacement therapies.

Original languageEnglish
Pages (from-to)1957-1965
Number of pages9
JournalDiabetes
Volume59
Issue number8
DOIs
Publication statusPublished - 08-2010

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All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

Cite this

Declercq, J., Kumar, A., Van Diepen, J. A., Vroegrijk, I. O. C. M., Gysemans, C., Di Pietro, C., Voshol, P. J., Mathieu, C., Ectors, N., Van De Ven, W. J. M., & Verfaillie, C. M. (2010). Increased β-cell mass by islet transplantation and PLAG1 overexpression causes hyperinsulinemic normoglycemia and hepatic insulin resistance in mice. Diabetes, 59(8), 1957-1965. https://doi.org/10.2337/db09-1446