Exercise alters the profile of phospholipid molecular species in rat skeletal muscle
Mitchell, T. W., Turner, N., Hulbert, A. J., Else, P. L., Hawley, J. A., Jong, S. L., Bruce, C. R., & Blanksby, Stephen J. (2004) Exercise alters the profile of phospholipid molecular species in rat skeletal muscle. Journal of Applied Physiology, 97(5), pp. 1823-1829.
We have determined the effect of two exercise-training intensities on the phospholipid profile of both glycolytic and oxidative muscle fibers of female Sprague-Dawley rats using electrospray-ionization mass spectrometry. Animals were randomly divided into three training groups: control, which performed no exercise training; low-intensity (8 m/min) treadmill running; or high-intensity (28 m/min) treadmill running. All exercise-trained rats ran 1,000 m/session for 4 days/wk for 4 wk and were killed 48 h after the last training bout. Exercise training was found to produce no novel phospholipid species but was associated with significant alterations in the relative abundance of a number of phospholipid molecular species. These changes were more prominent in glycolytic (white vastus lateralis) than in oxidative (red vastus lateralis) muscle fibers. The largest observed change was a decrease of ∼20% in the abundance of 1-stearoyl-2-docosahexaenoyl-phosphatidylethanolamine [PE(18:0/22:6); P < 0.001] ions in both the low- and high-intensity training regimes in glycolytic fibers. Increases in the abundance of 1-oleoyl-2-linoleoyl phopshatidic acid [PA(18:1/18:2); P < 0.001] and 1-alkenylpalmitoyl-2-linoleoyl phosphatidylethanolamine [plasmenyl PE (16:0/18:2); P < 0.005] ions were also observed for both training regimes in glycolytic fibers. We conclude that exercise training results in a remodeling of phospholipids in rat skeletal muscle. Even though little is known about the physiological or pathophysiological role of specific phospholipid molecular species in skeletal muscle, it is likely that this remodeling will have an impact on a range of cellular functions.
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|Item Type:||Journal Article|
|Additional Information:||Articles free to read on journal website after 12 months|
|Keywords:||Electrospray-ionization mass spectrometry, Exercise training, Fatty acids, Insulin sensitivity|
|ISSN:||1522-1601 (online) 8750-7587 (print)|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2004 the American Physiological Society|
|Deposited On:||13 May 2014 05:24|
|Last Modified:||03 Feb 2015 03:12|
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