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The Journal of Physiological Sciences

, Volume 60, Issue 5, pp 343–352 | Cite as

Skeletal muscle expression of bone morphogenetic protein-1 and tolloid-like-1 extracellular proteases in different fiber types and in response to unloading, food deprivation and differentiation

  • David L. AllenEmail author
  • Bradley J. Greyback
  • Andrea M. Hanson
  • Allison S. Cleary
  • Sarah F. Lindsay
Original Paper

Abstract

Members of the bone morphogenetic protein-1/mammalian tolloid (BMP-1/mTLD) family of proteases cleave diverse extracellular proteins, including the growth inhibitor myostatin. The purpose of this work was to examine the expression of BMP-1/mTLD, tolloid-like-1 and -2 (TLL1 and TLL2) in hindlimb muscles of the mouse in vivo and in C2C12 muscle cells in vitro. Quantitative real-time polymerase chain reaction revealed that neither BMP-1/mTLD nor TLL1 mRNA levels differed between the predominantly fast-twitch tibialis anterior (TA) and gastrocnemius (GAST) muscles and the more slow-twitch soleus (SOL) muscle; TLL2 mRNA levels were not detectable in any of the muscles examined. Interestingly, however, immunohistochemical analysis revealed that BMP-1 protein was expressed in type I and IIa but not in IIb fibers. TLL1 mRNA levels significantly increased in the TA but not the SOL with 3 days of hindlimb suspension and significantly decreased in both TA and SOL in response to 2 days of food deprivation. In contrast, BMP-1/mTLD mRNA levels were unaffected in either muscle by either condition. In addition, BMP-1/mTLD and TLL1 mRNA levels significantly decreased during C2C12 myoblast differentiation in vitro, and activity of a 1,200-bp mouse TLL1 promoter construct was significantly decreased in C2C12 myotubes by differentiation, by mutation of an nuclear factor kappa-beta (NF-kappaB) site, or deletion of a sma/mothers against decapentaplegic (SMAD) site. Together, these data demonstrate that TLL1 mRNA levels are altered by loading, energy status, and differentiation, and thus its expression may be regulated so as to modulate activity of myostatin or other extracellular substrates during these adaptive states.

Keywords

Myostatin Fast-twitch Slow-twitch Food deprivation Hindlimb suspension C2C12 

Notes

Acknowledgments

This work was partially supported by K01 grant AR0505-01 from the National Institutes of Health, and by two University of Colorado Innovative Seed Grants.

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Copyright information

© The Physiological Society of Japan and Springer 2010

Authors and Affiliations

  • David L. Allen
    • 1
    Email author
  • Bradley J. Greyback
    • 2
  • Andrea M. Hanson
    • 2
  • Allison S. Cleary
    • 1
  • Sarah F. Lindsay
    • 1
  1. 1.Department of Integrative PhysiologyUniversity of ColoradoBoulderUSA
  2. 2.Department of Aerospace EngineeringUniversity of ColoradoBoulderUSA

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