Iptakalim protects PC12 cell against H2O2-induced oxidative injury via opening mitochondrial ATP-sensitive potassium

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Yi Chai1, Ling Niu, Xiu-Lan Sun

  • 1Laboratory of Neuropharmacology, Department of Anatomy, Histology and Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, PR China.

Biochemical and Biophysical Research Communications
|October 3, 2006
PubMed

Insights

Iptakalim (IPT), an ATP-sensitive potassium channel opener, protects rat dopaminergic cells from oxidative stress. It achieves this by activating mitochondrial K(ATP) channels, reducing cell death and preserving neuron function.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pharmacology

Background:

  • Oxidative stress and excitotoxicity are implicated in dopaminergic neuron loss in Parkinson's disease.
  • ATP-sensitive potassium channels (K(ATP)) are potential therapeutic targets for neuroprotection.

Purpose of the Study:

  • To investigate the neuroprotective effects of iptakalim (IPT), a novel K(ATP) channel opener.
  • To determine the mechanism by which IPT protects dopaminergic PC12 cells against hydrogen peroxide (H(2)O(2))-induced injury.

Main Methods:

  • PC12 cells were pretreated with IPT and exposed to H(2)O(2) to induce oxidative stress.
  • Extracellular glutamate levels, calcium influx, and apoptosis-related gene expressions (bcl-2, bax) were measured.
  • The role of mitochondrial K(ATP) channels was assessed using a selective blocker, 5-hydroxydecanoate.

Main Results:

  • IPT pretreatment attenuated H(2)O(2)-induced increases in extracellular glutamate and inhibited calcium influx.
  • IPT modulated the expression of bcl-2 and bax, suggesting inhibition of apoptosis.
  • The protective effects of IPT were reversed by the mitoK(ATP) channel blocker 5-hydroxydecanoate.

Conclusions:

  • Iptakalim (IPT) demonstrates significant neuroprotective effects against H(2)O(2)-induced oxidative injury in PC12 cells.
  • These protective effects are mediated through the activation of mitochondrial K(ATP) channels (mitoK(ATP)).
  • IPT represents a potential therapeutic agent for conditions involving oxidative stress in dopaminergic neurons, such as Parkinson's disease.

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