NDLI: Anesthetic Isoflurane Induces DNA Damage Through Oxidative Stress and p53 Pathway

Content Provider	Springer Nature Link
Author	Ni, Cheng Li, Cheng Dong, Yuanlin Guo, Xiangyang Zhang, Yiying Xie, Zhongcong
Copyright Year	2016
Abstract	DNA damage is associated with aging and neurological disorders, including Alzheimer’s disease. Isoflurane is a commonly used anesthetic. It remains largely unknown whether isoflurane induces DNA damage. Phosphorylation of the histone protein H2A variant X at Ser139 (γH2A.X) is a marker of DNA damage. We therefore set out to assess the effects of isoflurane on γH2A.X level in H4 human neuroglioma cells and in brain tissues of mice. Oxidative stress, caspase-activated DNase (CAD), and the p53 signaling pathway are involved in DNA damage. Thus, we determined the interaction of isoflurane with reactive oxygen species (ROS), CAD, and p53 to illustrate the underlying mechanisms. The cells were treated with 2 % isoflurane for 3 or 6 h. The mice were anesthetized with 1.4 % isoflurane for 2 h. Western blot, immunostaining and live cell fluorescence staining were used in the experiments. We showed that isoflurane increased levels of γH2A.X, cleaved caspase-3, and nucleus translocation of CAD and decreased levels of inhibitor of CAD (ICAD) and p53. Isoflurane enhanced the nucleus level of γH2A.X. Moreover, caspase inhibitor Z-VAD and ROS generation inhibitor N-acetyl-L-cysteine (NAC) attenuated the isoflurane-induced increase in γH2A.X level. However, NAC did not significantly alter the isoflurane-induced reduction in p53 level. Finally, p53 activator (actinomycin D) and inhibitor (pifithrin-α) attenuated and potentiated the isoflurane-induced increase in γH2A.X level, respectively. These findings suggest that isoflurane might induce DNA damage, as represented by increased γH2A.X level, via induction of oxidative stress and inhibition of the repair of DNA damage through the p53 signaling pathway.
Starting Page	3591
Ending Page	3605
Page Count	15
File Format	PDF
ISSN	08937648
Journal	Molecular Neurobiology
Volume Number	54
Issue Number	5
e-ISSN	15591182
Language	English
Publisher	Springer US
Publisher Date	2016-05-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anesthesia DNA damage ROS Caspase-3 p53 Neurosciences Neurobiology Cell Biology Neurology
Content Type	Text
Resource Type	Article
Subject	Neurology Cellular and Molecular Neuroscience

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