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Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes
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Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes

Published on: June 16, 2011

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Advanced oxidation protein products promote NADPH oxidase-dependent β-cell destruction and dysfunction through the

Min Liang1, Aiqing Li1, Aiju Lou1

  • 1State Key Laboratory of Organ Failure Research, National Clinical Research Center of Kidney Disease, Key Clinical Specialty Discipline Construction Program, Division of Nephrology, Nanfang Hospital, Southern Medical University, Guangzhou, PR China.

Laboratory Investigation; a Journal of Technical Methods and Pathology
|March 7, 2017
PubMed

Insights

Accumulation of advanced oxidation protein products (AOPPs) triggers beta-cell destruction and dysfunction. This occurs via NADPH oxidase activation and the Bcl-2/Bax-caspase apoptotic pathway, potentially explaining beta-cell issues in various metabolic disorders.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathophysiology

Background:

  • Plasma advanced oxidation protein products (AOPPs) are associated with metabolic disorders like diabetes and obesity.
  • The role of AOPPs in beta-cell destruction and dysfunction remains unclear.

Purpose of the Study:

  • To investigate the pathophysiological relevance of AOPPs in beta-cell destruction and dysfunction.
  • To elucidate the molecular mechanisms underlying AOPP-induced beta-cell damage.

Main Methods:

  • In vitro studies using cultured rat beta-cells (INS-1) exposed to AOPPs.
  • In vivo studies using unilateral nephrectomized rats treated with AOPPs and apocynin.
  • Assessment of apoptosis markers (Bax, Bcl-2, caspase-3 activity), NADPH oxidase activation (p47phox translocation), and insulin levels.

Main Results:

  • AOPPs induced dose- and time-dependent beta-cell apoptosis by increasing Bax and caspase-3 activity while decreasing Bcl-2 expression.
  • AOPP exposure activated NADPH oxidases, leading to increased intracellular superoxide production and apoptosis.
  • In vivo, AOPPs caused beta-cell apoptosis, accumulation, and reduced insulin content; apocynin treatment ameliorated these effects.

Conclusions:

  • AOPP accumulation promotes beta-cell destruction and dysfunction through NADPH oxidase activation and the Bcl-2/Bax-caspase apoptotic pathway.
  • This mechanism offers a potential explanation for beta-cell impairment in patients with metabolic disorders associated with elevated AOPPs.

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