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High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds
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Published on: January 23, 2018

Neuregulin 4-dependent MAPK amplification mediates urate-induced β-cell dysfunction.

Yunyang Wang1,2, Kun Zhang3, Zhiyuan Li4

  • 1Department of Endocrinology and Metabolism, The Affiliated Hospital of Qingdao University, Qingdao, China.

Journal of Diabetes Investigation
|June 5, 2026
PubMed
Summary
This summary is machine-generated.

High uric acid levels disrupt glucose homeostasis and cause pancreatic beta-cell apoptosis through neuregulin-4 (Nrg4) and MAPK signaling.

Keywords:
ApoptosisHyperuricemiaNeuregulin4

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Area of Science:

  • Endocrinology
  • Metabolic Research
  • Molecular Biology

Background:

  • Clinical studies suggest a link between hyperuricemia (HU) and diabetes.
  • The exact role of serum urate in glucose metabolism remains unclear.
  • Novel spontaneous HU mouse models are needed to investigate these mechanisms.

Purpose of the Study:

  • To characterize glucose metabolism in a novel spontaneous HU mouse model.
  • To elucidate the molecular mechanisms underlying HU's impact on glucose metabolism.
  • To identify key mediators of HU-induced pancreatic beta-cell apoptosis.

Main Methods:

  • Generated a Uricase (Uox) gene knockout mouse model for spontaneous HU.
  • Analyzed islet microarray data from Uox-KO and wild-type mice to identify apoptosis-related genes.
  • Utilized MIN6 cells to assess apoptosis and protein expression via flow cytometry and Western blotting after siRNA transfection.

Main Results:

  • Male Uox-KO mice displayed glucose intolerance without insulin resistance.
  • Elevated pancreatic beta-cell apoptosis was observed in male Uox-KO mice.
  • Neuregulin-4 (Nrg4) was identified as a mediator of HU-induced beta-cell apoptosis, essential for urate-triggered cell death and MAPK activation.

Conclusions:

  • Hyperuricemia disrupts glucose homeostasis by inducing pancreatic beta-cell apoptosis.
  • Nrg4 upregulation and subsequent MAPK signaling amplification are key mechanisms.
  • This study provides molecular insights into the link between HU and impaired glucose metabolism.