Journal of Molecular Neuroscience

, Volume 45, Issue 1, pp 60–67 | Cite as

Inhibition of Endogenous Hydrogen Sulfide Generation is Associated with Homocysteine-Induced Neurotoxicity: Role of ERK1/2 Activation

  • Xiao-Qing Tang
  • Xin-Tian Shen
  • Yi-E Huang
  • Rong-Qian Chen
  • Yan-Kai Ren
  • Heng-Rong Fang
  • Yuan-Yuan Zhuang
  • Chun-Yan Wang
Article

Abstract

Both elevated homocysteine and decreased hydrogen sulfide (H2S) are observed in the brains of Alzheimer’s disease (AD) patients. Reactive oxygen species (ROS) overproduction contributes to the neurotoxicity of homocysteine; however, H2S is an endogenous antioxidant gas. Therefore, the aim of this study was to investigate whether the imbalance of proportion to this endogenous protective antioxidant gas is involved in homocysteine-caused neurotoxicity. We show that homocysteine inhibits the generation of endogenous H2S and the expression and activity of cystathionine-β-synthetase (CBS), the main enzyme responsible for the generation of H2S in PC12 cells. S-Adenosylmethionine, an activator of CBS, not only prevents homocysteine-induced inhibition of endogenous H2S production but also attenuates homocysteine-triggered cytotoxicity and accumulation of ROS. We find that activation of ERK1/2 occurs in homocysteine-treated PC12 cells and blockade of ERK1/2 with U0126 abolished the homocysteine-induced cytotoxicity and inhibitory effect on endogenous H2S generation. These results indicate that homocysteine neurotoxicity involves reduction of H2S production, which is caused by inhibition of CBS and mediated by activation of ERK1/2. Our study suggests a promising future of H2S-based therapies for neurodegenerative diseases such as AD.

Keywords

Homocysteine Hydrogen sulfide Cystathionine-β-synthetase ERK1/2 Neurotoxicity 

Notes

Acknowledgments

This study was supported by Natural Science Foundation of China (81071005 and 30770740), Natural Science Foundation of Hunan Province, China (06JJ2074), China Postdoctoral Science Foundation (2005038233), Plan Project for Scientific Research, Department of Science and Technology, Hunan Province (05FJ3039), and the Research Foundation of Education Bureau of Hunan Province (06C700).

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Xiao-Qing Tang
    • 1
  • Xin-Tian Shen
    • 1
    • 2
  • Yi-E Huang
    • 2
  • Rong-Qian Chen
    • 1
  • Yan-Kai Ren
    • 1
  • Heng-Rong Fang
    • 1
  • Yuan-Yuan Zhuang
    • 1
  • Chun-Yan Wang
    • 1
  1. 1.Department of Physiology, Medical CollegeUniversity of South ChinaHengyangPeople’s Republic of China
  2. 2.Department of PhysiologyHuaihua Medical CollegeHuaihuaPeople’s Republic of China

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