Lin 2012 FASEB J

From Bioblast
Publications in the MiPMap
Lin CT, Kelsey H, Fisher-Wellman KH, Perry CG, Kozy R, Lark DS, Gilliam LA, Smith CD, Neufer PD (2012) Low Intensity Exercise Attenuates Acute Lipid Loading-Induced Alterations in Mitochondrial Function in Rat Skeletal Muscle . FASEB J 1144.11.


Lin CT, Kelsey H, Fisher-Wellman KH, Perry CG, Kozy R, Lark DS, Gilliam LA, Smith CD, Neufer PD (2012) FASEB J

Abstract: A single high-fat meal acutely increases skeletal muscle mitochondrial H2O2 emitting potential (mEH2O2), shifts the intracellular redox environment to a more oxidized state, and increases circulating markers of oxidative stress. Bioenergetically, this implies an acute lipid load may elevate the reducing pressure/membrane potential ({Delta}{Psi}m) within mitochondria and, conversely, that even a mild increase in energy expenditure may be sufficient to prevent these effects. To test this hypothesis, male Sprague-Dawley rats received an oral lipid gavage (20% intralipid, 45 Kcal/kg lean body mass) or water followed either by 2h of rest or 1h of rest plus 1h of low intensity treadmill exercise (15 m/min, 0% grade). Permeabilized fiber bundles were prepared from red gastrocnemius muscle for testing mitochondrial function. In rats receiving lipid, {Delta}{Psi}m and mEH2O2 were higher (P<0.05) and calcium retention capacity (mCa2+RC, an index of resistance to mitochondrial permeability transition) was lower under state IV and/or "clamped" ADP-stimulated state III conditions. All three effects were prevented when lipid gavage was followed by low-intensity exercise. Respiratory capacity was unaffected by any of the interventions. These findings provide evidence that mitochondrial {Delta}{Psi}m, mEH2O2, and mCa2+RC are acutely affected by nutritional overload in skeletal muscle, but can be prevented by low intensity exercise. NIH DK073488

β€’ O2k-Network Lab: US NC Greenville Neufer PD, CA Toronto Perry CG

Labels: MiParea: Respiration, Exercise physiology;nutrition;life style 

Organism: Rat  Tissue;cell: Skeletal muscle  Preparation: Permeabilized tissue 

HRR: Oxygraph-2k, TPP 

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