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Follistatin in chondrocytes: the link between TRPV4 channelopathies and skeletal malformations.

Publication ,  Journal Article
Leddy, HA; McNulty, AL; Lee, SH; Rothfusz, NE; Gloss, B; Kirby, ML; Hutson, MR; Cohn, DH; Guilak, F; Liedtke, W
Published in: FASEB J
June 2014

Point mutations in the calcium-permeable TRPV4 ion channel have been identified as the cause of autosomal-dominant human motor neuropathies, arthropathies, and skeletal malformations of varying severity. The objective of this study was to determine the mechanism by which TRPV4 channelopathy mutations cause skeletal dysplasia. The human TRPV4(V620I) channelopathy mutation was transfected into primary porcine chondrocytes and caused significant (2.6-fold) up-regulation of follistatin (FST) expression levels. Pore altering mutations that prevent calcium influx through the channel prevented significant FST up-regulation (1.1-fold). We generated a mouse model of the TRPV4(V620I) mutation, and found significant skeletal deformities (e.g., shortening of tibiae and digits, similar to the human disease brachyolmia) and increases in Fst/TRPV4 mRNA levels (2.8-fold). FST was significantly up-regulated in primary chondrocytes transfected with 3 different dysplasia-causing TRPV4 mutations (2- to 2.3-fold), but was not affected by an arthropathy mutation (1.1-fold). Furthermore, FST-loaded microbeads decreased bone ossification in developing chick femora (6%) and tibiae (11%). FST gene and protein levels were also increased 4-fold in human chondrocytes from an individual natively expressing the TRPV4(T89I) mutation. Taken together, these data strongly support that up-regulation of FST in chondrocytes by skeletal dysplasia-inducing TRPV4 mutations contributes to disease pathogenesis.

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Published In

FASEB J

DOI

EISSN

1530-6860

Publication Date

June 2014

Volume

28

Issue

6

Start / End Page

2525 / 2537

Location

United States

Related Subject Headings

  • Up-Regulation
  • TRPV Cation Channels
  • Swine
  • Osteogenesis
  • Osteochondrodysplasias
  • Mutation
  • Mice
  • Humans
  • Follistatin
  • Chondrocytes
 

Citation

APA
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Leddy, H. A., McNulty, A. L., Lee, S. H., Rothfusz, N. E., Gloss, B., Kirby, M. L., … Liedtke, W. (2014). Follistatin in chondrocytes: the link between TRPV4 channelopathies and skeletal malformations. FASEB J, 28(6), 2525–2537. https://doi.org/10.1096/fj.13-245936
Leddy, Holly A., Amy L. McNulty, Suk Hee Lee, Nicole E. Rothfusz, Bernd Gloss, Margaret L. Kirby, Mary R. Hutson, Daniel H. Cohn, Farshid Guilak, and Wolfgang Liedtke. “Follistatin in chondrocytes: the link between TRPV4 channelopathies and skeletal malformations.FASEB J 28, no. 6 (June 2014): 2525–37. https://doi.org/10.1096/fj.13-245936.
Leddy HA, McNulty AL, Lee SH, Rothfusz NE, Gloss B, Kirby ML, et al. Follistatin in chondrocytes: the link between TRPV4 channelopathies and skeletal malformations. FASEB J. 2014 Jun;28(6):2525–37.
Leddy, Holly A., et al. “Follistatin in chondrocytes: the link between TRPV4 channelopathies and skeletal malformations.FASEB J, vol. 28, no. 6, June 2014, pp. 2525–37. Pubmed, doi:10.1096/fj.13-245936.
Leddy HA, McNulty AL, Lee SH, Rothfusz NE, Gloss B, Kirby ML, Hutson MR, Cohn DH, Guilak F, Liedtke W. Follistatin in chondrocytes: the link between TRPV4 channelopathies and skeletal malformations. FASEB J. 2014 Jun;28(6):2525–2537.

Published In

FASEB J

DOI

EISSN

1530-6860

Publication Date

June 2014

Volume

28

Issue

6

Start / End Page

2525 / 2537

Location

United States

Related Subject Headings

  • Up-Regulation
  • TRPV Cation Channels
  • Swine
  • Osteogenesis
  • Osteochondrodysplasias
  • Mutation
  • Mice
  • Humans
  • Follistatin
  • Chondrocytes