Compartmental heterogeneity of soluble phospholipases A.

Abstract:

:Multiple forms of soluble phospholipase A2 (PLA2) are known to coexist in venoms of individual reptilian species. While similar observations in several mammalian species suggest that this is a common phenomenon, the functional implications are not yet understood. In attempting to devise therapeutic strategies for treatment of inflammatory disorders by inhibition of PLA2, it is imperative to define the various PLA2 species in the relevant compartments. Herein, we report the presence of three PLA2 isotypes in rheumatoid arthritis serum, one pancreatic and two nonpancreatic phospholipases A2. The pancreatic and one of the nonpancreatic forms were optimally active in 7 mM calcium at pH 7.5. The other nonpancreatic form was calcium-independent and optimally active at pH 7.0. Only the calcium-dependent nonpancreatic form was observed in rheumatoid synovial fluid. Of the three serum isotypes, only the calcium-dependent nonpancreatic form correlated with markers of disease activity, such as the joint count and Landsbury index. Therefore, not all soluble or circulating phospholipases A2 are relevant to inflammatory processes. Selective inhibition of the proinflammatory form of PLA2 may prove to have some therapeutic benefit while minimizing the possible adverse effects of this form of intervention.

journal_name

Inflammation

journal_title

Inflammation

authors

Vadas P,Pruzanski W,Stefanski E,Sternby B

doi

10.1007/BF00917456

subject

Has Abstract

pub_date

1990-04-01 00:00:00

pages

173-83

issue

2

eissn

0360-3997

issn

1573-2576

journal_volume

14

pub_type

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