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Related Experiment Videos

Polyamines enhance calcium pyrophosphate dihydrate crystal dissolution

T Shinozaki1, K P Pritzker

  • 1Connective Tissue Research Group, Mount Sinai Hospital, Toronto, Canada.

The Journal of Rheumatology
|October 1, 1995
PubMed
Summary

Polyamines like spermine and spermidine enhance alkaline phosphatase (ALP) activity, promoting the dissolution of calcium pyrophosphate dihydrate (CPPD) crystals. This suggests a synergistic effect for intracellular processes requiring ALP pyrophosphatase activity.

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Area of Science:

  • Biochemistry
  • Crystallography
  • Enzymology

Background:

  • Alkaline phosphatase (ALP) possesses pyrophosphatase (PPiase) activity and can dissolve calcium pyrophosphate dihydrate (CPPD) crystals.
  • Polyamines are known substrates that can enhance PPiase activity.

Purpose of the Study:

  • To investigate the effect of polyamines on the CPPD crystal dissolution activity of ALP.
  • To determine if polyamines enhance ALP's ability to dissolve CPPD crystals.

Main Methods:

  • Utilized an in vitro model system for crystal-enzyme interactions.
  • Assessed CPPD crystal dissolution biochemically and morphologically using scanning electron microscopy.

Main Results:

  • Polyamines (spermine, spermidine) significantly enhanced ALP-induced CPPD crystal dissolution.

Related Experiment Videos

  • Observed stereoselective dissolution at specific crystal faces (010) with etch pit formation.
  • Demonstrated differential enhancement of ALP PPiase activity by polyamines.

    • Conclusions:

    • Polyamines synergistically enhance ALP's stereoselective dissolution of CPPD crystals.
    • These findings have implications for understanding CPPD crystal dissolution.
    • Suggests a synergistic role for polyamines and ALP in intracellular energy metabolism via ALP PPiase activity.