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J. (1987) 244 (497–502) (Printed in Great Britain) The effect of sn-2 fatty acid substitution on phospholipase C enzyme activities. nutritional supplement J S Bomalaski and M A Clark Department of Medicine, Philadelphia Veterans Administration Medical Center, PA 19104. The human monocyte cell line U937 expresses phospholipase A2 and phospholipase C activities and produces eicosanoids. The phospholipase C (PLC) activity exhibits substrate preference for phosphatidyl-choline (PC), rather than phosphatidylinositol or phosphatidylethanolamine. In order to characterize the PLC nutritional supplement activity found in these cells, the effects of substitution nutritional supplement of the sn-2 fatty acid on this activity were examined. PC substrates with palmitic acid (PC-2P), oleic acid (PC-2O), arachidonic acid (PC-2A) and linoleic acid (PC-2L) at the sn-2 position were used. The sn-1 fatty acid was palmitic acid. PC-2L and PC-2A with the longer-chain less-saturated fatty acids linoleic acid and arachidonic acid esterified at sn-2 were found to be better substrates for PLC activity than PC-2P or PC-2O in these cells.
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