Inhibition of Myostatin Signaling through Notch Activation following Acute Resistance Exercise

Matthew G. MacKenzie, David Lee Hamilton, Mark Pepin, Amy Patton, Keith Baar

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Myostatin is a TGFβ family member and negative regulator of muscle size. Due to the complexity of the molecular pathway between myostatin mRNA/protein and changes in transcription, it has been difficult to understand whether myostatin plays a role in resistance exercise-induced skeletal muscle hypertrophy. To circumvent this problem, we determined the expression of a unique myostatin target gene, Mighty, following resistance exercise. Mighty mRNA increased by 6 h (82.9±24.21%) and remained high out to 48 h (56.5±19.67%) after resistance exercise. Further examination of the soleus, plantaris and tibialis anterior muscles showed that the change in Mighty mRNA at 6 h correlated with the increase in muscle size associated with this protocol (R2 = 0.9996). The increase in Mighty mRNA occurred both independent of Smad2 phosphorylation and in spite of an increase in myostatin mRNA (341.8±147.14% at 3 h). The myostatin inhibitor SKI remained unchanged. However, activated Notch, another potential inhibitor of TGFβ signaling, increased immediately following resistance exercise (83±11.2%) and stayed elevated out to 6 h (78±16.6%). Electroportion of the Notch intracellular domain into the tibialis anterior resulted in an increase in Mighty mRNA (63±13.4%) that was equivalent to the canonical Notch target HES-1 (94.4±7.32%). These data suggest that acute resistance exercise decreases myostatin signaling through the activation of the TGFβ inhibitor Notch resulting in a decrease in myostatin transcriptional activity that correlates well with muscle hypertrophy.

Original languageEnglish (US)
Article numbere68743
JournalPLoS One
Volume8
Issue number7
DOIs
StatePublished - Jul 2 2013

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Myostatin
myostatin
strength training
Chemical activation
Exercise
Muscle
Messenger RNA
Muscles
muscles
hypertrophy
Hypertrophy
Phosphorylation
Inhibition (Psychology)
Transcription
skeletal muscle
phosphorylation
Skeletal Muscle
transcription (genetics)
Genes

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Inhibition of Myostatin Signaling through Notch Activation following Acute Resistance Exercise. / MacKenzie, Matthew G.; Hamilton, David Lee; Pepin, Mark; Patton, Amy; Baar, Keith.

In: PLoS One, Vol. 8, No. 7, e68743, 02.07.2013.

Research output: Contribution to journalArticle

MacKenzie, Matthew G. ; Hamilton, David Lee ; Pepin, Mark ; Patton, Amy ; Baar, Keith. / Inhibition of Myostatin Signaling through Notch Activation following Acute Resistance Exercise. In: PLoS One. 2013 ; Vol. 8, No. 7.
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