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Related Experiment Videos

ATP-induced chondrocalcinosis.

L M Ryan1, I V Kurup, B A Derfus

  • 1Department of Medicine, Medical College of Wisconsin, Milwaukee.

Arthritis and Rheumatism
|December 1, 1992
PubMed
Summary
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Adult articular cartilage mineralizes when exposed to adenosine triphosphate (ATP). This process, crucial for understanding chondrocalcinosis, involves ATP hydrolysis and occurs in cartilage vesicles.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Skeletal Biology

Background:

  • Articular cartilage is a specialized connective tissue crucial for joint function.
  • The mineralization of cartilage is a complex process with implications for skeletal development and diseases like chondrocalcinosis.

Purpose of the Study:

  • To investigate the potential of adult articular cartilage to undergo mineralization in the presence of adenosine triphosphate (ATP).
  • To elucidate the mechanism by which ATP influences cartilage mineralization.

Main Methods:

  • Adult porcine articular cartilage and chondrocyte monolayers were cultured in media containing ATP.
  • Mineralization was quantified by measuring the retention of radioactive calcium-45 (45Ca).
  • Cartilage samples were examined using electron microscopy.

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Main Results:

  • Articular cartilage demonstrated significant 45Ca sequestration when incubated with 100 microM ATP.
  • Mineralization was dependent on the hydrolysis of ATP to adenosine monophosphate (AMP) and inorganic pyrophosphate, as evidenced by experiments with an ATP analog and pyrophosphatase.
  • Electron microscopy revealed mineral deposition concentrated within vesicles in the perichondral region of the cartilage.

Conclusions:

  • Adult articular cartilage is capable of mineralization when exposed to ATP.
  • The observed mineralization mechanism in cartilage is similar to that seen in isolated matrix vesicles.
  • These findings support a role for articular cartilage structures in the pathogenesis of chondrocalcinosis.