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Related Experiment Videos

Phospholipase A2 in rat gingival tissue.

H Shinohara1, H Ishida, E J Fernandez

  • 1Department of Periodontology and Endodontology, School of Dentistry, Tokushima University, Japan.

Journal of Periodontal Research
|September 1, 1992
PubMed
Summary

Phospholipase A2 (PLA2) is an enzyme implicated in rheumatoid arthritis. This study found PLA2 activity in rat gingival tissue, suggesting its potential role in periodontal disease pathogenesis.

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Area of Science:

  • Biochemistry
  • Oral Biology
  • Enzymology

Background:

  • Phospholipase A2 (PLA2) is a proinflammatory enzyme found in rheumatoid arthritis patients.
  • Rheumatoid arthritis and periodontitis share similar pathogenic pathways.

Purpose of the Study:

  • To investigate the enzymatic properties of PLA2 in periodontal tissue.
  • To explore the potential role of gingival PLA2 in periodontitis.

Main Methods:

  • Demonstrated PLA2 activity in rat gingival tissue.
  • Characterized the cytosolic PLA2 enzyme's substrate specificity, detergent sensitivity, Ca2+ ion dependency, and optimal pH.
  • Assessed inhibition by sodium-deoxycholate.

Main Results:

  • PLA2 activity was primarily found in the cytosolic fraction (approx. 80%) of rat gingival tissue.

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  • Phosphatidylethanolamine was the preferred substrate over phosphatidylcholine.
  • Ca2+ ions were essential for activity, with optimal activity at pH 9.0.
  • Sodium-deoxycholate strongly inhibited enzyme activity in a dose-dependent manner.

    • Conclusions:

    • Gingival PLA2 exhibits enzymatic properties similar to synovial fluid PLA2.
    • These findings suggest a potential involvement of gingival PLA2 in the pathogenesis of gingivitis and periodontitis.