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Lysophosphatidylcholine metabolism to 1,2-diacylglycerol in lymphoblasts: Involvement of a phosphatidylcholine-hydrolyzing phospholipase C

Journal Article · · Biochemistry; (USA)
DOI:https://doi.org/10.1021/bi00433a023· OSTI ID:5672882
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  1. Johns Hopkins Univ. School of Medicine, Baltimore, MD (USA)

The authors have previously described the chemoattraction of lymphoblasts by lysophosphatidylcholine. In studying the mechanism of chemoattraction it was found that lysophosphatidylcholine was metabolized to 1,2-diacylglycerol by the lymphoblastic cell line 6C3HED. One route of metabolism involves the acylation of lysophosphatidylcholine to phosphatidylcholine with subsequent hydrolysis to 1,2-diacylglycerol and phosphocholine by the action of phospholipase C. The increase in cellular 1,2-diacylglycerol was established by metabolic experiments using ({sup 14}C)glycerol-labeled lysophosphatidylcholine and by mass measurements of 1,2-diacylglycerol. The presence of a phosphatidylcholine-hydrolyzing phospholipase C was confirmed in 6C3HED cell homogenates. In intact cells, lysophosphatidylcholine induced a pattern of protein phosphorylation similar to those of 1,2-dioctanoylglycerol and phorbol 12-myristate 13-acetate, two known activators of protein kinase C. This pathway of lysophosphatidylcholine metabolism, which involves a phosphatidylcholine-hydrolyzing phospholipase C, may be important in the activation of protein kinase C independent of inositol phospholipid hydrolysis.

OSTI ID:
5672882
Journal Information:
Biochemistry; (USA), Journal Name: Biochemistry; (USA) Vol. 28:7; ISSN 0006-2960; ISSN BICHA
Country of Publication:
United States
Language:
English