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Oxidative stress-induced c-Jun N-terminal kinase (JNK) activation in tendon cells upregulates MMP1 mRNA and protein expression

✍ Scribed by Fang Wang; George A.C. Murrell; Min-Xia Wang

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
548 KB
Volume
25
Category
Article
ISSN
0736-0266

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✦ Synopsis

Abstract

To explore the potential mechanisms of tendon degeneration, we investigated the role of c‐Jun N‐terminal Kinase (JNK) activation and the regulation of matrix metalloproteinase 1 (MMP1) in tendon matrix degradation under oxidative stress. JNK and MMP1 activity in samples from normal and ruptured human supraspinatus tendons was evaluated by immunohistochemistry. Real‐time quantitative PCR was utilized to evaluate MMP1 mRNA expression and Western blotting for MMP1 and JNK protein detection. JNK activation and increased MMP1 activity were found in the torn human supraspinatus tendon tissue, as well as in human tendon cells under in vitro oxidative stress. Inhibition of JNK prevented MMP1 overexpression in oxidative stressed human tendon cells. Results from the current study indicated that stress activated JNK plays an important role in tendon matrix degradation, possibly through upregulating of MMP1. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res

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