Contribution of type II phospholipase A2 to in vitro phospholipase A2 enzymatic activity in human term placenta
نویسندگان
چکیده
منابع مشابه
Assaying phospholipase A2 activity.
Mammalian cells contain many structurally and functionally diverse phospholipases A2 (PLA2) that catalyze the hydrolysis of sn-2 fatty acid from membrane phospholipid. Assays are described for measuring the activity of Group IVA cytosolic PLA2alpha(cPLAalpha) and for secreted PLA2s (sPLA2) that are suitable for purified enzymes and for measuring activity in crude cell lysates and culture medium...
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A novel approach based on dc and ac cyclic voltammetric techniques to evaluate interfacial enzymatic activity is presented. As an illustrative example, the hydrolytic effect of phospholipase A2 (PLA2) on an L-R-dioleoylphosphatidylcholine (DOPC) monolayer adsorbed onto a mercury electrode surface has been studied and kinetic parameters have been evaluated. The enzymatic activity obtained in thi...
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The aim of this study was to establish the effect of bacterial endotoxin lipopolysaccharide (LPS) on the release of Type II phospholipase-A2 (PLA2) and prostaglandin E2 (PGE2) from late-pregnant human placental tissue incubated in vitro. Under basal conditions, immunoreactive Type II PLA2 and PGE2 were released from tissue explants in a time-dependent manner (up to 24 h, ANOVA, P<0. 0001, n=6)....
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Melittin and phospholipase A2-activating protein (PLAP) are known as efficient activators of secretory phospholipase A2(sPLA2) types I, II, and III when phospholipid liposomes are used as substrate. The present study demonstrates that both peptides can either inhibit or activate sPLA2 depending on the peptide/phospholipid ratio when erythrocyte membranes serve as a biologically relevant substra...
متن کاملNovel mammalian group XII secreted phospholipase A2 lacking enzymatic activity.
An increasing number of mammalian secreted phospholipases A(2) (sPLA(2)s) has been identified over the past few years. Here, we report the identification and recombinant expression of a novel sPLA(2)-like protein in mouse and human species that has been called group XIIB (GXIIB). The mature protein has a molecular mass of 19.7 kDa and structural features similar to those of the previously ident...
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ژورنال
عنوان ژورنال: Journal of Endocrinology
سال: 1998
ISSN: 0022-0795,1479-6805
DOI: 10.1677/joe.0.1570025