Volume 11 Supplement 1

Proceedings of the Eleventh International Society of Sports Nutrition (ISSN) Conference and Expo

Open Access

Phosphatidic acid feeding increases muscle protein synthesis and select mTORC1 pathway signaling mediators in rodent skeletal muscle

  • C Brooks Mobley1,
  • Carlton D Fox1,
  • Corrie Pascoe1,
  • James Healy1,
  • Brian S Ferguson1,
  • Ryan P Lowery2,
  • Christopher M Lockwood3,
  • Jeffrey R Stout4,
  • Ralf Jäger5,
  • Andreas N Kavazis1,
  • Jacob M Wilson2 and
  • Michael D Roberts1Email author
Journal of the International Society of Sports Nutrition201411(Suppl 1):P50

https://doi.org/10.1186/1550-2783-11-S1-P50

Published: 1 December 2014

Background

Human and cell culture studies have demonstrated that phosphatidic acid (PA) can increase muscle mass and anabolic signaling, respectively. However, no in vivo evidence to date has examined whether PA can increase intramuscular anabolic signaling in vivo. The purpose of this study was to examine – a) if PA feeding acutely increases post-prandial muscle protein synthesis (MPS) and anabolic signaling markers; and b) if PA can enhance the post-prandial anabolic effects of whey protein concentrate (WPC).

Methods

Male Wistar rats (~250 g) were fasted overnight (~18 h) and fed either: a) 1 ml water (n = 14), b) 28 mg PA (eq. to 1.5 g human dose; n = 8), c) 197 mg WPC (eq. to 10 g human dose; n = 8), or d) PA+WPC (n = 8). 2.5 h post-feeding rats were injected with 5.44 mg puromycin diHCl for MPS assessment via SUnSET and 3 hours post-feeding rats were euthanized and mixed gastrocnemius muscles were removed for immunoblotting analyses. The treatment of the animals in this study adhered to commonly accepted ethics guidelines.

Results

Compared to water-fed rats, PA feeding caused an elevation in numerous Akt-mTOR markers and, in some instances, PA+WPC exhibted a greater increase in Akt-mTOR signaling markers (Erk1/2 Thr202/Tyr204, Bad Ser112, p70s6k Thr389). However, compared to water-fed rats, the PA, WPC, and PA+WPC groups exhibited greater MPS responses with no differences existing between conditions.

Conclusion

This is the first in vivo data demonstrating that PA feeding increases MPS. More post-prandial time course data with resistance exercise is needed to better elucidate how PA feeding affects muscle anabolism.

Authors’ Affiliations

(1)
Auburn University
(2)
University of Tampa
(3)
4Life Research, LLC
(4)
University of Central Florida
(5)
Increnovo, LLC

Copyright

© Mobley et al; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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