| Autophagy is Involved in Traumatic Brain Injury-Induced Cell Death and Contributes to Functional Outcome Deficits in Mice. | |
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MedLine Citation:
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PMID: 21463664 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Previous data demonstrate that traumatic brain injury (TBI) activates autophagy, and increases microtubule-associated protein 1 light chain 3 (LC3) immunostaining mainly in neurons. However, the role of autophagy in traumatic brain damage remains elusive. The aim of the present study was to investigate the autophagic mechanisms participating in traumatic brain injury. The autophagy inhibitors 3-methyladenine (3-MA) and bafliomycin A1 (BFA) were administered with a single intracerebroventricular (i.v.c.) injection before TBI. We first examined the protein levels of Beclin-1 and LC3 II, which have been found to promote autophagy previously. Immunoblotting analysis showed that 3-MA pretreatment reduced post-TBI Beclin-1 and LC3-II levels, and maintained p62/SQSTM1 (p62) levels. In addition, double immunolabeling showed that the increased punctate LC3-II dots colocalizing with propidium iodide (PI)-stained nuclei at 24 h after injury, were partially inhibited by 3-MA pretreatment. Furthermore, inhibition of autophagy could reduce TBI-induced cell injury assessed with intraperitoneal injection of PI and lesion volume, and attenuate behavioral outcome evaluated by motor test and Morris water maze. The neuroprotective effects were associated with an inhibition on TBI-induced up-regulation of LC3, Beclin-1, cathepsin B, caspase-3 and the Beclin-1/Bcl-2 ratio. Taken together, these data imply that the autophagy pathway is involved in the pathophysiologic responses after TBI, and inhibition of this pathway may help attenuate traumatic damage and functional outcome deficits. |
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Authors:
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C-L Luo; B-X Li; Q-Q Li; X-P Chen; Y-X Sun; H-J Bao; D-K Dai; Y-W Shen; H-F Xu; H Ni; L Wan; Z-H Qin; L-Y Tao; Z-Q Zhao |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-1 |
Journal Detail:
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Title: Neuroscience Volume: - ISSN: 1873-7544 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-5 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7605074 Medline TA: Neuroscience Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011. Published by Elsevier Ltd. |
Affiliation:
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Department of Forensic Medicine, Shanghai Medical College, Fudan University, 138 Medical College Road, Xuhui District, Shanghai 200032, PR China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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