Intermittent compressive strain may reduce aggrecanase expression in cartilage: A study of chondrocytes in agarose gel

Kensuke Mio, Seiji Saito, Taisuke Tomatsu, Yoshiaki Toyama

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We tested the hypothesis that intermittent compressive strain reduces the catabolic actions of interleukin-1 beta on chondrocyte metabolism at the gene expression level. We investigated the effects of intermittent compressive strain on mRNA expression in bovine chondrocytes cultured in agarose gel supplemented with or without interleukin-1 beta. Fifteen percent compressive strain amplitude was applied to agarose-chondrocyte constructs at a frequency of 1 Hz. In the absence of interleukin-1 beta, the strain caused an increase in the mRNA levels of anabolic factors like aggrecan and Type II collagen, compared with the levels of anabolic factors in unstrained constructs. These results suggest that the strain may stimulate matrix production in normal cartilage. Interleukin-1 beta is a powerful catabolic agent; in unstrained agarose-chondrocyte constructs, interleukin-1 beta caused a decrease in the mRNA levels of anabolic factors. However, interleukin-1 beta also caused an increase in the mRNA of catabolic factors like aggrecanase-1, aggrecanase-2, and matrix metalloproteinase-3. In the presence of interleukin-1 beta, the strain reduced the mRNA levels of aggrecanase-1 and aggrecanase-2. These results suggest that intermittent compressive strain may protect cartilage by suppressing the expression of aggrecanase-1 and aggrecanase-2, which are thought to be the major matrix-degrading enzymes responsible for cleaving aggrecan.

Original languageEnglish
Pages (from-to)225-232
Number of pages8
JournalClinical Orthopaedics and Related Research
Issue number433
DOIs
Publication statusPublished - 2005 Apr

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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