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Joy JM, Gundermann DM, Lowery RP, et al. Phosphatidic acid enhances mTOR signaling and resistance exercise induced hypertrophy. Nutr Metab (Lond). 2014;11:29doi: 10.1186/1743-7075-11-29.
Joy, J. M., Gundermann, D. M., Lowery, R. P., Jäger, R., McCleary, S. A., Purpura, M., Roberts, M. D., Wilson, S. M., Hornberger, T. A., & Wilson, J. M. (2014). Phosphatidic acid enhances mTOR signaling and resistance exercise induced hypertrophy. Nutrition & metabolism, 1129. https://doi.org/10.1186/1743-7075-11-29
Joy, Jordan M, et al. "Phosphatidic acid enhances mTOR signaling and resistance exercise induced hypertrophy." Nutrition & metabolism vol. 11 (2014): 29. doi: https://doi.org/10.1186/1743-7075-11-29
Joy JM, Gundermann DM, Lowery RP, Jäger R, McCleary SA, Purpura M, Roberts MD, Wilson SM, Hornberger TA, Wilson JM. Phosphatidic acid enhances mTOR signaling and resistance exercise induced hypertrophy. Nutr Metab (Lond). 2014 Jun 16;11:29. doi: 10.1186/1743-7075-11-29. eCollection 2014. PMID: 24959196; PMCID: PMC4066292.
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Nutr Metab (Lond). 2014 Jun 16;11:29. doi: 10.1186/1743-7075-11-29. eCollection 2014.

Phosphatidic acid enhances mTOR signaling and resistance exercise induced hypertrophy.

Nutrition & metabolism

Jordan M Joy, David M Gundermann, Ryan P Lowery, Ralf Jäger, Sean A McCleary, Martin Purpura, Michael D Roberts, Stephanie Mc Wilson, Troy A Hornberger, Jacob M Wilson

Affiliations

  1. Department of Health Sciences and Human Performance, The University of Tampa, 401 W. Kennedy Blvd., Box 30 F, Tampa, FL 33606, USA.
  2. Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA.
  3. Increnovo LLC, 2138 E Lafayette Pl, Milwaukee, WI 53202, USA.
  4. School of Kinesiology, Auburn University, Auburn, AL, USA.
  5. Department of Nutrition, IMG Academy, Bradenton, FL, USA.

PMID: 24959196 PMCID: PMC4066292 DOI: 10.1186/1743-7075-11-29

Abstract

INTRODUCTION: The lipid messenger phosphatidic acid (PA) plays a critical role in the stimulation of mTOR signaling. However, the mechanism by which PA stimulates mTOR is currently unknown. Therefore, the purpose of this study was to compare the effects of various PA precursors and phospholipids on their ability to stimulate mTOR signaling and its ability to augment resistance training-induced changes in body composition and performance.

METHODS: In phase one, C2C12 myoblasts cells were stimulated with different phospholipids and phospholipid precursors derived from soy and egg sources. The ratio of phosphorylated p70 (P-p70-389) to total p70 was then used as readout for mTOR signaling. In phase two, resistance trained subjects (n = 28, 21 ± 3 years, 77 ± 4 kg, 176 ± 9 cm) consumed either 750 mg PA daily or placebo and each took part in an 8 week periodized resistance training program.

RESULTS: In phase one, soy-phosphatidylserine, soy-Lyso-PA, egg-PA, and soy-PA stimulated mTOR signaling, and the effects of soy-PA (+636%) were significantly greater than egg-PA (+221%). In phase two, PA significantly increased lean body mass (+2.4 kg), cross sectional area (+1.0 cm), and leg press strength (+51.9 kg) over placebo.

CONCLUSION: PA significantly activates mTOR and significantly improved responses in skeletal muscle hypertrophy, lean body mass, and maximal strength to resistance exercise.

Keywords: Ergogenic aid; Phospholipid; Protein synthesis; Skeletal muscle; Supplementation

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