title: Hydrogen peroxide attenuates insulin-like growth factor-1 neuroprotective effect, prevented by minocycline.
abstract: Oxidative stress-induced neuronal death due to hydrogen peroxide overload plays a critical role in the pathogenesis of numerous neurological diseases. Insulin-like growth factor-1 (IGF-1) is important in maintaining neuronal survival, proliferation, and differentiation in the central nervous system. We now report that sublethal doses of hydrogen peroxide attenuated IGF-1 neuroprotective activity on cultured cerebellar granule neurons under potassium and serum deprivation. Interestingly, this attenuation can be prevented by minocycline, an antibiotic that has been shown to have neuroprotective activity in animal models of neuronal injury. Furthermore, hydrogen peroxide also blocked IGF-1's neuroprotection for cortical neurons deprived of neurotrophic factors (B27), which was prevented by minocycline. Our data suggest that inhibition of IGF-1 signaling by hydrogen peroxide may constitute an additional pathway contributing to its neurotoxicity. More importantly, combining minocycline and IGF-1 could be an effective treatment in neurological diseases associated with both oxidative stress and deficiency of IGF-1.
authors.affiliation: Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202-5225, United States.
authors.forename: Jin
authors.initials: J
authors.lastname: Zhong
authors.forename: Wei-Hua
authors.initials: WH
authors.lastname: Lee
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology; D001927:Brain Diseases / Q000378:metabolism* / Q000503:physiopathology; D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D016895:Culture Media, Serum-Free / Q000633:toxicity; D019610:Cytoprotection / Q000187:drug effects / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D006861:Hydrogen Peroxide / Q000633:toxicity; D007334:Insulin-Like Growth Factor I / Q000819:agonists / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051379:Mice; D008911:Minocycline / Q000494:pharmacology* / Q000627:therapeutic use; D009410:Nerve Degeneration / Q000378:metabolism* / Q000503:physiopathology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D018696:Neuroprotective Agents / Q000037:antagonists & inhibitors / Q000378:metabolism; D016877:Oxidants / Q000633:toxicity; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology*; D011188:Potassium / Q000633:toxicity; D051381:Rats; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology
chemical_list: D000900:Anti-Bacterial Agents; D016895:Culture Media, Serum-Free; D018696:Neuroprotective Agents; D016877:Oxidants; D007334:Insulin-Like Growth Factor I; D006861:Hydrogen Peroxide; D008911:Minocycline; D011188:Potassium