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The effect of thymosin β4 on articular cartilage chondrocyte matrix metalloproteinase expression

Blain, Emma Jane ORCID:, Mason, Deborah Jane ORCID: and Duance, Victor Colin ORCID: 2002. The effect of thymosin β4 on articular cartilage chondrocyte matrix metalloproteinase expression. Biochemical Society Transactions 30 (6) , pp. 879-882. 10.1042/BST0300879

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Mechanical loading is paramount in regulating both the anabolic and catabolic activities of articular cartilage chondrocytes, essential for the matrix to retain its functional integrity. We have identified thymosin beta(4) as a putative mechanically regulated gene that may mediate load-enhanced synthesis and activation of matrix metalloproteinases (MMPs) 2 and 9 in articular cartilage. The objective of this study was to confirm the mechanical regulation of thymosin beta(4) and determine its effect on cartilage chondrocyte MMP production. Thymosin beta(4) mRNA expression, analysed by quantitative PCR, revealed a significant 20-fold increase in cartilage loaded for 10 min which was still evident after 30 min of loading. Treatment of primary chondrocytes with 2 and 4 micro x ml(-1) thymosin beta(4) peptide for 4 h significantly increased pro-MMP 9 expression and activation. We postulate a functional role for load-induced thymosin beta(4) in modulating the cytoskeletal organization of articular cartilage chondrocytes to affect MMP expression.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QP Physiology
R Medicine > R Medicine (General)
Uncontrolled Keywords: actin cytoskeleton; cyclic compression; gelatin zymography; mechanotransduction; quantitative PCR
Additional Information: 677th Meeting Held at Cardiff University, Wales, 16–18 July 2002
Publisher: Biochemical Society
ISSN: 0300-5127
Last Modified: 19 Oct 2022 10:19

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