Abstract
Hexadecylphosphorylcholine (HePC, D-18506, INN: Mitelfosine) belongs to the family of alkylphosphocholines with anticancer activity. Previous reports have related its antitumoral activity to their ability to interfere with phospholipid metabolism. However a clear mechanism of action has not been established yet. We have investigated the effect of HePC on two enzymes recently reported to play a role in cell growth proliferation, phospholipase D (PLD) and choline kinase (ChoK). Our results demonstrate that treatment with HePC induces a rapid stimulation of PLD, that may be achieved by PKC dependent or independent mechanisms, depending on the cell line investigated. Both PLD1 and PLD2 isoenzymes are sensitive to HePC activation. By contrast, no effect was observed by HePC on ChoK, a new target for anticancer drug development. Furthermore, in all cell lines tested, a chronic exposure of the cells to HePC abrogates PLD activation by either phorbol esters or HePC itself with no effect on total cellular PLD levels. This is reflected in a strong inhibition of PLD activity. We suggest that the inhibitory effects on PLD by HePC may be related to its antitumoral action.
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Abbreviations
- HePC:
-
hexadecylphosphorylcholine
- PLD:
-
phospholipase D
- PKC:
-
protein kinase C
- PI-PLC:
-
PI-specific phospholipase C
- PIP2:
-
phosphatidylinositol 4,5-bisphosphate
- IP3:
-
inositol trisphosphate
- DAG:
-
diacylglicerol
- PC:
-
phosphatidylcholine
- Cho:
-
choline
- PA:
-
phosphatidic acid
- LPA:
-
lysophosphatidic acid
- PAH:
-
phosphatidic acid hydrolase
- PCho:
-
phosphorylcholine
- DMEM:
-
Dulbecco's modified Eagle's medium
- MDCK:
-
Madin-Darby Canine Kidney epithelial cells
- PDBu:
-
Phorbol 12,13-dibutyrate
- PtdBut:
-
phosphatidylbutanol
- PDGF:
-
platelet derived growth factor
- FGF:
-
fibroblast growth factor
- ChoK:
-
choline kinase
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Acknowledgements
We are grateful to Dr MA Frohman for PLD1 and PLD2 plasmids. This work was supported by the following grants: SAF98-112-C02-01 from DGESIC, 08.1/45.1/98 from Consejería de Educación of Comunidad de Madrid, FIS 99/817, FEDER 2FD97-647 and 2FD97-1569. V Penalva is a fellow from Comunidad de Madrid. R Hernández-Alcoceba was supported by a fellowship of Fundación Ramón Areces.
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Lucas, L., Hernández-Alcoceba, R., Penalva, V. et al. Modulation of phospholipase D by hexadecylphosphorylcholine: a putative novel mechanism for its antitumoral activity. Oncogene 20, 1110–1117 (2001). https://doi.org/10.1038/sj.onc.1204216
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DOI: https://doi.org/10.1038/sj.onc.1204216
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