| First Author | So V | Year | 2016 |
| Journal | Biochim Biophys Acta | Volume | 1861 |
| Issue | 12 Pt A | Pages | 1993-1999 |
| PubMed ID | 27713003 | Mgi Jnum | J:256873 |
| Mgi Id | MGI:6104562 | Doi | 10.1016/j.bbalip.2016.09.021 |
| Citation | So V, et al. (2016) Diacylglycerol kinase epsilon suppresses expression of p53 and glycerol kinase in mouse embryo fibroblasts. Biochim Biophys Acta 1861(12 Pt A):1993-1999 |
| abstractText | The incorporation of glycerol into lipid was measured using SV40 transformed mouse embryo fibroblasts (MEFs) from either wild-type (WT) mice or from mice in which the epsilon isoform of diacylglycerol kinase (DGKepsilon) was knocked out (DGKepsilon(-/-)). We present an explanation for our finding that DGKepsilon(-/-) MEFs exhibited greater uptake of (3)H-glycerol into the cell and a greater incorporation into lipids compared with their WT counterparts, with no change in the relative amounts of various lipids between the DGKepsilon(-/-) and WT MEFs. Glycerol kinase is more highly expressed in the DGKepsilon(-/-) cells than in their WT counterparts. In addition, the activity of glycerol kinase is greater in the DGKepsilon(-/-) cells than in their WT counterparts. Other substrates that enter the cell independent of glycerol kinase, such as pyruvate or acetate, are incorporated into lipid to the same extent between DGKepsilon(-/-) and WT cell lines. We also show that expression of p53, a transcription factor that increases the synthesis of glycerol kinase, is increased in DGKepsilon(-/-) MEFs in comparison to WT cells. We conclude that the increased incorporation of glycerol into lipids in DGKepsilon(-/-) cells is a consequence of up-regulation of glycerol kinase and not a result of an increase in the rate of lipid synthesis. Furthermore, increased expression of the pro-survival gene, p53, in cells knocked out for DGKepsilon suggests that cells over-expressing DGKepsilon would have a greater propensity to become tumorigenic. |
