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ADAMTS-5: the story so far.

A J Fosang1, F M Rogerson, C J East

  • 1University of Melbourne Department of Paediatrics and Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, Victoria, Australia. amanda.fosang@mcri.edu.au

European Cells & Materials
|February 6, 2008
PubMed
Summary
This summary is machine-generated.

ADAMTS-5 is the primary aggrecanase in mouse cartilage, unlike ADAMTS-4. While research is ongoing for humans, ADAMTS-5 shows higher activity and distinct gene regulation compared to ADAMTS-4.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Rheumatology

Background:

  • ADAMTS-5 was recently identified as the main aggrecanase in mouse cartilage, shifting focus from ADAMTS-4.
  • The roles of ADAMTS-4 and ADAMTS-5 in human cartilage aggrecanolysis remain debated.
  • Limited information was available on ADAMTS-5 regulation, expression, and activity prior to this research.

Purpose of the Study:

  • To review and synthesize current data on ADAMTS-5 in cartilage aggrecanolysis.
  • To compare the activity, regulation, and expression of ADAMTS-5 and ADAMTS-4.
  • To clarify the relative importance of ADAMTS-4 and ADAMTS-5 in human cartilage.

Main Methods:

  • In vitro studies utilizing siRNA, neutralizing antibodies, and immunoprecipitation.
  • Analysis of ADAMTS-5 and ADAMTS-4 deficient mouse models in experimental arthritis.
  • Comparison of recombinant human ADAMTS-5 and ADAMTS-4 activity.
  • Investigation of C-terminal processing's effect on enzyme activity.
  • Examination of gene regulation and expression patterns in human chondrocytes and synovial fibroblasts.

Main Results:

  • ADAMTS-5-deficient mice are protected from cartilage erosion in arthritis models, unlike ADAMTS-4 deficient mice.
  • Recombinant human ADAMTS-5 exhibits significantly higher catalytic activity than ADAMTS-4.
  • ADAMTS-5 is typically constitutively expressed in human chondrocytes and synovial fibroblasts.
  • ADAMTS-4 expression is induced by pro-inflammatory cytokines, contrasting with ADAMTS-5's constitutive expression.
  • Enzyme activity for both ADAMTS-4 and ADAMTS-5 is modulated by C-terminal processing.

Conclusions:

  • ADAMTS-5 plays a significant role in cartilage aggrecanolysis, potentially more so than ADAMTS-4, especially in pathological conditions.
  • The opposing gene regulation patterns of ADAMTS-5 and ADAMTS-4 suggest distinct biological functions.
  • Further research is needed to definitively establish ADAMTS-5 as the major aggrecanase in human cartilage, but current evidence strongly supports its critical role.