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Purification and Characterization of a Phospholipase A2 from Human Osteoarthritic Synovial Fluid

  • Thomas P. Parks
  • Susan Lukas
  • Ann F. Hoffman
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 275)

Abstract

Phospholipase A2 (PLA2) from human osteoarthritic synovial fluid was purified to homogeneity in three steps. The NH2-terminal amino acid sequence and biochemical characteristics of the enzyme were identical to the Peak A PLA2 activity of rheumatoid synovial fluid (1). The enzyme exhibited an apparent mass of 14,000, an absolute Ca++- dependence, an alkaline pH optimum, and was inhibited by sodium deoxycholate (DOC), NaCl and 0.5 M Tris-HCl. The enzyme strongly prefered phosphatidylethanolamine (PE) as substrate over phosphatidylcholine (PC) or phosphatidylinositol (PI), and hydrolyzed PE containing arachidonic acid or linoleic acid in the sn-2 position at similar rates. Heparin bound to the enzyme but did not inhibit catalytic activity. In addition, the human enzyme was not inhibited by the acidic ‘chaperone’ subunit of crotoxin despite considerable sequence similarity with the basic PLA2 subunit of the neurotoxin. The enzyme was capable of hydrolyzing E. coli membrane phospholipids in the presence of the neutrophil bactericidal/permeability increasing protein (BPI). This finding, coupled to the reported pro-inflammatory activity and presence of the enzyme in inflammatory cells, supports the hypothesis that it may be a component of the host defense mechanism which can, under certain conditions, contribute to the pathogenesis of inflammatory disease.

Keywords

Hyaluronic Acid Synovial Fluid Chondroitin Sulfate Platelet Activate Factor Aristolochic Acid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • Thomas P. Parks
    • 1
  • Susan Lukas
    • 1
  • Ann F. Hoffman
    • 1
  1. 1.Department of BiochemistryBoehringer Ingelheim Pharmaceuticals, Inc.RidgefieldUSA

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