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Title: Hypoxia treatment reverses neurodegenerative disease in a mouse model of Leigh syndrome

The most common pediatric mitochondrial disease is Leigh syn-drome, an episodic, subacute neurodegeneration that can lead to death within the first few years of life, for which there are no proven general therapies. Mice lacking the complex I subunit, Ndufs4, develop a fatal progressive encephalopathy resembling Leigh syndrome and die at ≈60 d of age. We previously reported that contin-uously breathing normobaric 11% O 2 from an early age prevents neurological disease and dramatically improves survival in these mice. Here, we report three advances. First, we report updated sur-vival curves and organ pathology in Ndufs4 KO mice exposed to hypoxia or hyperoxia. Whereas normoxia-treated KO mice die from neurodegeneration at about 60 d, hypoxia-treated mice eventually die at about 270 d, likely from cardiac disease, and hyperoxia-treated mice die within days from acute pulmonary edema. Second, we report that more conservative hypoxia regimens, such as contin-uous normobaric 17% O 2 or intermittent hypoxia, are ineffective in preventing neuropathology. Finally, we show that breathing normobaric 11% O 2 in mice with late-stage encephalopathy re-verses their established neurological disease, evidenced by im-proved behavior, circulating disease biomarkers, and survival rates. Importantly, the pathognomonic MRI brain lesions and neurohistopathologic findings are reversed after 4more » wk of hyp-oxia. Upon return to normoxia, Ndufs4 KO mice die within days. Future work is required to determine if hypoxia can be used to prevent and reverse neurodegeneration in other animal models, and to determine if it can be provided in a safe and practical manner to allow in-hospital human therapeutic trials.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Massachusetts General Hospital, Boston, MA (United States)
  2. Massachusetts General Hospital, Boston, MA (United States); Brigham and Women's Hospital (Harvard Medical School), Boston, MA (United States); Broad Inst. of Harvard and MIT, Cambridge, MA (United States)
Publication Date:
Grant/Contract Number:
FG02-97ER25308
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 21; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Krell Inst., Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES
OSTI Identifier:
1355951
Alternate Identifier(s):
OSTI ID: 1426066