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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Pachter, J. A. Pai, J. K. Weinstein, I. B. Bishop, W. R. |
| Description | Author Affiliation: Pai JK ( Department of Microbiology, Schering-Plough Research, Bloomfield, NJ 07003.); |
| Abstract | We are using a Rat-6 fibroblast cell line that stably overexpresses the beta 1 isozyme of protein kinase C (PKC) to study regulation of phospholipid hydrolysis by PKC. Stimulation of control (R6-C1) or overexpressing (R6-PKC3) cells with phorbol ester results in an increase in diacylglycerol (DAG) mass with no increase in inositol phosphates, indicating that DAG is not formed by inositol phospholipid breakdown. A more dramatic DAG increase occurs in R6-PKC3 cells (4.0-fold over basal) compared to R6-C1 cells (1.5-fold over basal). To further define the source of DAG, phosphatidylcholine (PC) pools were labeled with [3H]myristic acid or with [3H]- or [32P]alkyllyso-PC and formation of labeled phosphatidylethanol, an unambiguous marker of phospholipase D activation, was monitored. Phorbol ester-stimulated phosphatidylethanol formation is 5-fold greater in the R6-PKC3 cell line. Formation of radiolabeled phosphatidic acid (PA) is also enhanced by PKC overexpression. In cells double-labeled with [3H]- and [32P]-alkyl-lysoPC, the 3H/32P ratio of PA and PC are identical 15 min after stimulation, suggesting that a phospholipase D mechanism predominates. In support of this, the PA phosphohydrolase inhibitor propranolol decreased phorbol 12-myristate 13-acetate-stimulated DAG formation by 72%. Increases in DAG and phosphatidylethanol were inhibited by the PKC inhibitors K252a and staurosporine. These results indicate that phospholipase D is regulated by the action of PKC. Enhanced phospholipase D activity may contribute to the growth abnormalities seen in PKC-overexpressing cells. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 2 |
| Volume Number | 88 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1991-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Diglycerides Metabolism Phospholipase D Protein Kinase C Tetradecanoylphorbol Acetate Pharmacology Alkaloids Animals Carbazoles Cell Line Fibroblasts Drug Effects Indole Alkaloids Inositol Kinetics Lysophosphatidylcholines Myristic Acid Myristic Acids Antagonists & Inhibitors Genetics Staurosporine Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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