Molecular Metabolism (Oct 2017)

Neonatal pancreatic pericytes support β-cell proliferation

  • Alona Epshtein,
  • Eleonor Rachi,
  • Lina Sakhneny,
  • Shani Mizrachi,
  • Daria Baer,
  • Limor Landsman

DOI
https://doi.org/10.1016/j.molmet.2017.07.010
Journal volume & issue
Vol. 6, no. 10
pp. 1330 – 1338

Abstract

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Objective: The maintenance and expansion of β-cell mass rely on their proliferation, which reaches its peak in the neonatal stage. β-cell proliferation was found to rely on cells of the islet microenvironment. We hypothesized that pericytes, which are components of the islet vasculature, support neonatal β-cell proliferation. Methods: To test our hypothesis, we combined in vivo and in vitro approaches. Briefly, we used a Diphtheria toxin-based transgenic mouse system to specifically deplete neonatal pancreatic pericytes in vivo. We further cultured neonatal pericytes isolated from the neonatal pancreas and combined the use of a β-cell line and primary cultured mouse β-cells. Results: Our findings indicate that neonatal pancreatic pericytes are required and sufficient for β-cell proliferation. We observed impaired proliferation of neonatal β-cells upon in vivo depletion of pancreatic pericytes. Furthermore, exposure to pericyte-conditioned medium stimulated proliferation in cultured β-cells. Conclusions: This study introduces pancreatic pericytes as regulators of neonatal β-cell proliferation. In addition to advancing current understanding of the physiological β-cell replication process, these findings could facilitate the development of protocols aimed at expending these cells as a potential cure for diabetes.

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