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Identifying the human aggrecanase.

A J Fosang1, F M Rogerson

  • 1University of Melbourne, Department of Paediatrics, Royal Children's Hospital, Parkville, Australia. amanda.fosang@mcri.edu.au

Osteoarthritis and Cartilage
|July 17, 2010
PubMed
Summary
This summary is machine-generated.

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Identifying the major aggrecanase in human cartilage is challenging due to complex regulatory processes. Current methods for measuring ADAMTS activity in vivo are insufficient for pinpointing the primary human aggrecanase.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cartilage Biology

Background:

  • ADAMTS-5 is the primary aggrecanase in mouse cartilage.
  • The major aggrecanase responsible for cartilage degradation in humans remains unidentified.
  • Multiple molecular processes regulate aggrecanase activity, complicating identification.

Purpose of the Study:

  • To discuss the regulatory processes affecting ADAMTS activity in human cartilage.
  • To highlight the limitations of current methods in identifying the major human aggrecanase.
  • To argue for a holistic approach in assessing aggrecanase activity in vivo.

Main Methods:

  • Review of existing methodologies for measuring ADAMTS mRNA expression.
  • Assessment of techniques for detecting aggrecanase activity.

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  • Discussion of regulatory mechanisms influencing enzyme activity from gene expression to enzyme action.

    • Main Results:

    • Current methods can measure ADAMTS mRNA levels and aggrecanase activity separately.
    • No current methods can definitively distinguish the source of aggrecanase activity in humans.
    • Various post-transcriptional and post-translational modifications influence final enzyme activity.

    Conclusions:

    • Understanding the regulation of ADAMTS activity is crucial for identifying the major human aggrecanase.
    • Measuring individual processes in isolation provides limited insight into overall in vivo ADAMTS activity.
    • A comprehensive approach is needed to accurately determine the key aggrecanase in human cartilage degradation.