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Differential regulation of gene expression in isolated tendon fascicles exposed to cyclic tensile strain in vitro

Maeda, Eijiro, Shelton, Julia .C, Bader, Dan L. and Lee, David A. (2009) Differential regulation of gene expression in isolated tendon fascicles exposed to cyclic tensile strain in vitro Journal of Applied Physiology, 106, (2), pp. 506-512. (doi:10.1152/japplphysiol.90981.2008). (PMID:19036888).

Record type: Article


Mechanical stimulus is a regulator of tenocyte metabolism. The present study investigated temporal regulation of the expression of selected genes by tenocytes in isolated fascicles subjected to tensile strain in vitro. Cyclic tensile strain with a 3% amplitude superimposed on a 2% static strain was provided for 10 min, followed by either an unstrained period or continuous cyclic strain until the end of a 24-h incubation period. mRNA expression of selected anabolic and catabolic genes were evaluated with quantitative PCR at 10 min, 1 h, 6 h, and 24 h.

The application of 6-h cyclic strain significantly upregulated type III collagen mRNA expression in strained fascicles compared with unstrained controls, but no alterations were observed in mRNA expression of type I collagen and biglycan. Significant downregulation in the expression of the decorin core protein was observed in fascicles subjected to 24-h cyclic strain. MMP3 and MMP13 expression levels were upregulated by the application of 10 min of cyclic strain, followed by a progressive downregulation until the end of the incubation period in both the absence and the presence of the continuing cyclic strain. Accordingly, alterations in the expression of anabolic genes were limited to the upregulation of type III collagen by prolonged exposure to cyclic strain, whereas catabolic genes were upregulated by a small number of strain cycles and downregulated by a prolonged cyclic strain. These findings demonstrate distinctive patterns of mechanoregulation for anabolic and catabolic genes and help our understanding of tenocyte response to mechanical stimulation.

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Published date: 2009
Keywords: cyclic strain, metabolism, mechanobiology


Local EPrints ID: 169353
ISSN: 8750-7587
PURE UUID: f0ab9e05-dba6-4cb2-8d26-0f468df63297

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Date deposited: 14 Dec 2010 09:47
Last modified: 18 Jul 2017 12:19

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Author: Eijiro Maeda
Author: Julia .C Shelton
Author: Dan L. Bader
Author: David A. Lee

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