Abstract:
INTRODUCTION:Skeletal muscle oxidative capacity decreases and fatigability increases after spinal cord injury. Transcription factor peroxisome proliferator-activated receptor δ (PPARδ) promotes a more oxidative phenotype. METHODS:We asked whether PPARδ overexpression could ameliorate these deficits in the medial gastrocnemius of spinal cord transected (ST) adult mice. RESULTS:Time-to-peak tension and half-relaxation times were longer in PPARδ-Con and PPARδ-ST compared with littermate wild-type (WT) controls. Fatigue index was 50% higher in PPARδ-Con than WT-Con and 70% higher in the PPARδ-ST than WT-ST. There was an overall higher percent of darkly stained fibers for succinate dehydrogenase in both PPARδ groups. CONCLUSIONS:The results indicate a conversion toward slower, more oxidative, and less fatigable muscle properties with overexpression of PPARδ. Importantly, the elevated fatigue resistance was maintained after ST, suggesting that enhanced PPARδ expression, and possibly small molecule agonists, could ameliorate the increased fatigability routinely observed in chronically paralyzed muscles.
journal_name
Muscle Nervejournal_title
Muscle & nerveauthors
Kim JA,Roy RR,Zhong H,Alaynick WA,Embler E,Jang C,Gomez G,Sonoda T,Evans RM,Edgerton VRdoi
10.1002/mus.24723subject
Has Abstractpub_date
2016-02-01 00:00:00pages
287-96issue
2eissn
0148-639Xissn
1097-4598journal_volume
53pub_type
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