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- W1554799752 abstract "The anti-oxidant sodium bisulfite has been shown to inhibit acid active(lysosomal), non-Ca/sup + +/-dependent phospholipase A/sub 2/ (PLA/sub 2/), and to interact reversibly with unsaturated fatty acids, altering their chromatographic mobility. The authors examined the effect of bisulfite on neutral active, Ca/sup + +/-dependent PLA/sub 2/ from human plasma. Using (1-/sup 14/C)oleate-labelled autoclaved E. coli as substrate, PLA/sub 2/ activity was inhibited in a dose-dependent manner by bisulfite. Maximal inhibition occurred at 100..mu..M bisulfite. Preincubation of plasma for 0-30 minutes with bisulfite resulted in a time-dependent increase in PLA/sub 2/ inhibition. Preincubation of substrate with bisulfite had no such effect. When the plasma PLA/sub 2/ was purified 25-fold by SP-Sephadex chromatography it was no longer inhibited by bisulfite. The SP-Sephadex wash through fraction, which contained greater than 95% of the applied protein but not PLA/sub 2/ activity, did not inhibit the purified enzyme. When incubated with bisulfite however, the SP-wash through fraction produced dose-dependent inhibition of the purified enzyme. These results indicate that sodium bisulfite inhibits human plasma PLA/sub 2/, in vitro, indirectly by interaction with a factor(s) present in plasma and suggests that anti-oxidants may similarly influence expression of extracellular PLA/sub 2/ in vivo." @default.
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- W1554799752 date "1987-05-01" @default.
- W1554799752 modified "2023-09-26" @default.
- W1554799752 title "Inhibition of phospholipase A/sub 2/ from human plasma by sodium bisulfite" @default.
- W1554799752 hasPublicationYear "1987" @default.
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