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Blocking Ca2+ Channel β3 Subunit Reverses Diabetes.

Kayoung Lee1, Jaeyoon Kim1, Martin Köhler2

  • 1Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Korea.

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|July 26, 2018
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Voltage-gated calcium channels (Cav) are crucial for insulin release. Overexpression of the Cavβ3 subunit impairs pancreatic beta cell function in diabetes, suggesting it as a potential therapeutic target.

Keywords:
Ca(2+) dynamicsCa(v)β(3)diabetesinsulin secretionpancreatic islets

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Diabetes Research

Background:

  • Voltage-gated calcium channels (Cav) are critical for insulin secretion from pancreatic beta cells.
  • The Cavβ3 subunit's role in diabetes-related pancreatic beta cell dysfunction is not well understood.

Purpose of the Study:

  • To investigate the role of Cavβ3 in pancreatic beta cell function and insulin secretion in the context of diabetes.
  • To explore Cavβ3 as a potential therapeutic target for diabetes.

Main Methods:

  • Studied islets from diabetic and high-fat diet (HFD)-induced diabetic mouse models.
  • Utilized Cavβ3-deficient mice (Cavβ3-/-).
  • Employed antisense oligonucleotides to normalize Cavβ3 expression in islets.
  • Assessed cytosolic Ca2+ ([Ca2+]i) dynamics, insulin secretion, and glucose tolerance.
  • Investigated Cavβ3 expression and function in human islets.

Main Results:

  • Diabetic mouse islets exhibited Cavβ3 overexpression, altered [Ca2+]i dynamics, and impaired insulin secretion.
  • Cavβ3-/- mice demonstrated improved islet function and glucose tolerance in HFD-induced diabetes.
  • Normalization of Cavβ3 expression in diabetic islets rescued [Ca2+]i dynamics and insulin secretion.
  • Cavβ3 overexpression in human islets also impaired insulin secretion.

Conclusions:

  • Cavβ3 overexpression contributes to pancreatic beta cell dysfunction and impaired insulin secretion in diabetes.
  • Cavβ3 deficiency improves islet function and glucose tolerance in diabetic models.
  • Cavβ3 represents a potential druggable target for the treatment of diabetes.