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Characterization of cytosolic phospholipase A2 in rat mastocytoma RBL-2H3.

Authors: Nakatani, Y  Hara, S  Murakami, M  Kudo, I  Inoue, K 
Citation: Nakatani Y, etal., Biol Pharm Bull. 1994 Jan;17(1):47-50.
Pubmed: (View Article at PubMed) PMID:8148815

We previously reported that cultured mast cells expressed three discrete phospholipases A2 (PLA2S), one of which showed a remarkable preference for phospholipids bearing an arachidonoyl residue at the sn-2 position [M. Murakami, et al., J. Biochem., 111, 175 (1992)]. In the present study, we have purified and characterized this enzyme using rat mastocytoma RBL-2H3 as an enzyme source. The elution profiles of the arachidonoyl-preferential PLA2 activity of rat mastocytoma RBL-2H3 cells on several column chromatographies were indistinguishable from those of 85-kDa cytosolic PLA2 (cPLA2) characterized so far. The molecular mass of the partially purified PLA2 was estimated to be about 90 kDa by gel filtration and it hydrolyzed arachidonate-containing phospholipids preferentially in the presence of submicromolar Ca2+ concentrations. Furthermore, it was immunoprecipitated with an anti-rabbit cPLA2 antibody almost completely. From these observations, we have concluded that the arachidonoyl-preferential PLA2 in mast cells belongs to the "cPLA2" family.


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CRRD Object Information
CRRD ID: 1642483
Created: 2007-09-18
Species: All species
Last Modified: 2007-09-18
Status: ACTIVE


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