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Targeted activation of AMPK by GSK621 ameliorates H2O2-induced damages in osteoblasts

Weidong Liu1, Li Mao2, Feng Ji1

  • 1Department of Orthopedics, Huai'an First People's Hospital, Nanjing Medical University, Huai'an, China.

Oncotarget
|January 7, 2017
PubMed

Insights

GSK621 protects osteoblasts from hydrogen peroxide damage by activating AMP-activated protein kinase (AMPK). This novel activator reduces cell death and apoptosis, highlighting its therapeutic potential.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Osteoblasts are crucial for bone health.
  • Oxidative stress, induced by hydrogen peroxide (H2O2), can cause osteoblast injury.
  • AMP-activated protein kinase (AMPK) is a key regulator of cellular energy metabolism and survival.

Purpose of the Study:

  • To investigate the cytoprotective effects of GSK621, a novel AMPK activator, in H2O2-treated osteoblasts.
  • To elucidate the role of AMPK activation in GSK621-mediated cytoprotection.
  • To explore the mechanisms underlying GSK621's protective effects, including its impact on reactive oxygen species (ROS) and autophagy.

Main Methods:

  • Utilized cultured MC3T3-E1 osteoblastic cells and primary murine osteoblasts.
  • Administered H2O2 to induce oxidative stress.
  • Assessed cell viability and apoptosis.
  • Manipulated AMPK activity using genetic (mutations, shRNA) and pharmacological approaches.
  • Measured nicotinamide adenine dinucleotide phosphate (NADPH) and ROS levels.
  • Investigated the role of autophagy through pharmacological inhibition.

Main Results:

  • GSK621 significantly reduced H2O2-induced cell death and apoptosis in osteoblasts.
  • AMPK activation was essential for GSK621's cytoprotective effects; inhibition of AMPK blocked protection.
  • Overexpression of a constitutively active AMPK mutant alleviated H2O2-induced injury.
  • GSK621 increased intracellular NADPH levels, leading to decreased H2O2-induced ROS production.
  • GSK621 activated cytoprotective autophagy, which was necessary for its protective effects.

Conclusions:

  • Targeted activation of AMPK by GSK621 effectively ameliorates H2O2-induced injury in osteoblasts.
  • GSK621 exerts cytoprotection by enhancing NADPH levels to reduce ROS and activating autophagy.
  • GSK621 represents a promising therapeutic agent for conditions involving osteoblast oxidative stress.
Keywords:
AMPKGSK621osteoblastsosteonecrosisoxidative stress

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