Abstract
Phospholipase D (PLD) activity is elevated in response to mitogenic and oncogenic signals. PLD also cooperates with overexpressed tyrosine kinases to transform rat fibroblasts. 3Y1 rat fibroblasts overexpressing the tyrosine kinase c-Src undergo apoptosis in response to serum withdrawal. We report here that elevated expression of either PLD1 or PLD2 in these cells prevents apoptosis induced by serum withdrawal. 3Y1 cells transformed by the activated tyrosine kinase v-Src have elevated PLD activity and are resistant to apoptosis induced by serum withdrawal. However, if PLD activity is blocked, the v-Src-transformed cells underwent apoptosis. MDA-MB-231 cells are a human breast cancer cell line with substantially elevated levels of PLD activity. Inhibiting PLD activity in these cells similarly rendered them sensitive to the apoptotic insult of serum withdrawal. These data indicate that elevated PLD activity generates a survival signal(s) allowing cells to overcome default apoptosis programs.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 615-619 |
| Number of pages | 5 |
| Journal | Biochemical and Biophysical Research Communications |
| Volume | 302 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 14 2003 |
| Externally published | Yes |
Bibliographical note
Funding Information:We thank M. Frohman (SUNY, Stony Brook) for the hPLD1 and mPLD2 genes used to generate the inducible PLD expression vectors. This investigation was supported by National Institutes of Health Grants RO1-CA46677 and SO6-GM60654. Research Centers in Minority Institutions award RR-03037 from the National Center for Research Resources of the National Institutes of Health, which supports infrastructure and instrumentation in the Biological Sciences Department at Hunter College, is also acknowledged.
