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KIOM-4 Protects against Oxidative Stress-Induced Mitochondrial Damage in Pancreatic β-cells via Its Antioxidant

Kyoung Ah Kang1, Jin Sook Kim, Rui Zhang

  • 1School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea.

Evidence-Based Complementary and Alternative Medicine : Ecam
|July 30, 2011
PubMed

Insights

KIOM-4, a plant extract mixture, protects pancreatic beta cells from diabetes-induced mitochondrial damage. It reduces oxidative stress and improves mitochondrial function, offering a potential therapeutic approach for diabetes.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Streptozotocin (STZ) induces mitochondrial oxidative stress in pancreatic beta cells, contributing to diabetes.
  • Oxidative stress damages cellular components, leading to mitochondrial dysfunction and cell death.

Purpose of the Study:

  • To investigate the protective effects of KIOM-4 against STZ-induced mitochondrial damage in rat pancreatic beta cells (RINm5F).
  • To elucidate the underlying mechanisms of KIOM-4's protective action, focusing on antioxidant and mitochondrial protective properties.

Main Methods:

  • In vitro antioxidant assays to assess radical scavenging activity of KIOM-4.
  • STZ-induced diabetic cell model (RINm5F) to evaluate KIOM-4's effects on mitochondrial ROS, Mn SOD, Nrf2, lipid peroxidation, DNA damage, and mitochondrial membrane potential.
  • Assessment of cytochrome c translocation, ATP levels, succinate dehydrogenase activity, and insulin secretion.

Main Results:

  • KIOM-4 demonstrated significant scavenging activity against superoxide and hydroxyl radicals.
  • KIOM-4 treatment attenuated STZ-induced increases in mitochondrial ROS, lipid peroxidation, protein carbonyls, and DNA modification.
  • KIOM-4 upregulated mitochondrial manganese superoxide dismutase (Mn SOD) activity and protein expression, partly via Nrf2 activation.
  • KIOM-4 restored mitochondrial membrane potential, inhibited cytochrome c release, and improved ATP production and succinate dehydrogenase activity.
  • KIOM-4 treatment normalized STZ-induced reduction in insulin levels.

Conclusions:

  • KIOM-4 exerts protective effects against STZ-induced mitochondrial oxidative stress and dysfunction in pancreatic beta cells.
  • The protective mechanisms involve potent antioxidant activity and direct preservation of mitochondrial integrity and function.
  • KIOM-4 represents a promising therapeutic agent for managing diabetes by mitigating beta cell damage.

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