PPARδ preserves a high resistance to fatigue in the mouse medial gastrocnemius after spinal cord transection.

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 Nerve

journal_title

Muscle & nerve

authors

Kim JA,Roy RR,Zhong H,Alaynick WA,Embler E,Jang C,Gomez G,Sonoda T,Evans RM,Edgerton VR

doi

10.1002/mus.24723

subject

Has Abstract

pub_date

2016-02-01 00:00:00

pages

287-96

issue

2

eissn

0148-639X

issn

1097-4598

journal_volume

53

pub_type

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