Inflammation

, Volume 15, Issue 2, pp 127–135 | Cite as

Comparison of group I and II soluble phospholipases A2 activities on phagocytic functions of human polymorphonuclear and mononuclear phagocytes

  • Waldemar Pruzanski
  • Susan Saito
  • Eva Stefanski
  • Peter Vadas
Original Articles

Abstract

Soluble phospholipase A2 (PLA2) purified from rheumatoid synovial fluid (group II) and repurifiedNaja naja venom PLA2 (group I) were compared for their influence on phagocytic activity of human polymorphonuclear (PMN) and mono-nuclear (MO) phagocytes. Group II PLA2 reduced chemotaxis, adhesiveness, and intracellular bactericidal activity (ICBA) and induced release of muramidase from PMNs. Group I PLA2 suppressed chemotaxis, and enhanced ICBA but had no influence on other phagocytic functions. Group II PLA2 purified from synovial fluid or from placenta caused marked spontaneous superoxide generation followed by inhibition of phagocytosis-induced burst of energy. Group INaja naja and porcine pancreatic PLA2 had no effect on superoxide generation. Group II but not group I PLA2 reduced markedly ICBA of monocytes. It may be concluded that human group II soluble PLA2, in concentrations comparable to those present in inflamed joints or in sera of patients with active arthritis or septic shock, causes spontaneous formation of the oxygen radical superoxide and release of lysosomal enzymes, and suppresses conventional phagocytic activities of PMNs and monocytes. Marked differences between group I and group II PLA2s may mean that these enzymes exert different influences on cell membrane.

Keywords

Muramidase Synovial Fluid Lysosomal Enzyme Phagocytic Activity Mononuclear Phagocyte 

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Copyright information

© Plenum Publishing Corporation 1991

Authors and Affiliations

  • Waldemar Pruzanski
    • 1
  • Susan Saito
    • 1
  • Eva Stefanski
    • 1
  • Peter Vadas
    • 1
  1. 1.Inflammation Research Group, The Wellesley HospitalUniversity of TorontoCanada

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