PFKFB3 gene silencing decreases glycolysis, induces cell‐cycle delay and inhibits anchorage‐independent growth in HeLa cells
- 8 May 2006
- journal article
- Published by Wiley in FEBS Letters
- Vol. 580 (13), 3308-3314
- https://doi.org/10.1016/j.febslet.2006.04.093
Abstract
The high rate of glycolysis despite the presence of oxygen in tumor cells (Warburg effect) suggests an important role for this process in cell division. The glycolytic rate is dependent on the cellular concentration of fructose 2,6-bisphosphate (Fru-2,6-P2), which, in turn, is controlled by the bifunctional enzyme 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (PFK-2). The ubiquitous PFK-2 isoenzyme (uPFK-2, alternatively named UBI2K5 or ACG) coded by the pfkfb3 gene is induced by different stimuli (serum, progesterone, insulin, hypoxia, etc.) and has the highest kinase/phosphatase activity ratio amongst all PFK-2 isoenzymes discovered to date, which is consistent with its role as a powerful activator of glycolysis. uPFK-2 is expressed in brain, placenta, transformed cells and proliferating cells. In the present work, we analyze the impact of small interfering RNA (siRNA)-induced silencing of uPFK-2 on the inhibition of cell proliferation. HeLa cells treated with uPFK-2 siRNA showed a decrease in uPFK-2 RNA levels measured at 24h. uPFK-2 protein levels were severely depleted at 48–72h when compared with cells treated with an unrelated siRNA, correlating with decreased glycolytic activity, Fru-2,6-P2, lactate and ATP concentrations. These metabolic changes led to reduced viability, cell-cycle delay and an increase in the population of apoptotic cells. Moreover, uPFK-2 suppression inhibited anchorage-independent growth. The results obtained highlight the importance of uPFK-2 on the regulation of glycolysis, on cell viability and proliferation and also on anchorage-independent growth. These data underscore the potential for uPFK-2 as an effective tumor therapeutic targetKeywords
This publication has 42 references indexed in Scilit:
- No induction of anti-viral responses in human cell lines HeLa and MCF-7 when transfecting with siRNA or siLNABiochemical and Biophysical Research Communications, 2006
- Specific expression of pfkfb4 gene in spermatogonia germ cells and analysis of its 5′‐flanking regionFEBS Letters, 2004
- Effects of Length and Location on the Cellular Response to Double-Stranded RNAMicrobiology and Molecular Biology Reviews, 2004
- 14-3-3s regulate fructose-2,6-bisphosphate levels by binding to PKB-phosphorylated cardiac fructose-2,6-bisphosphate kinase/phosphataseThe EMBO Journal, 2003
- Survival-promoting functions of 14-3-3 proteinsBiochemical Society Transactions, 2002
- Analysis of gene function in somatic mammalian cells using small interfering RNAsMethods, 2002
- Fructose 2,6-bisphosphate metabolism in Ehrlich ascites tumour cellsZeitschrift für Krebsforschung und Klinische Onkologie, 1995
- A Kinetic Study of Pyrophosphate: Fructose‐6‐Phosphate Phosphotransferase from Potato TubersJBIC Journal of Biological Inorganic Chemistry, 1982
- “Western Blotting”: Electrophoretic transfer of proteins from sodium dodecyl sulfate-polyacrylamide gels to unmodified nitrocellulose and radiographic detection with antibody and radioiodinated protein AAnalytical Biochemistry, 1981
- On the Origin of Cancer CellsScience, 1956