期刊
BIOCHEMICAL JOURNAL
卷 452, 期 -, 页码 531-543出版社
PORTLAND PRESS LTD
DOI: 10.1042/BJ20121886
关键词
gene regulation; glycolysis; metabolism; mitogen-activated protein kinase-activated protein kinase 2 (MK2); p38; 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3 (PFKFB3); stress stimulus
资金
- Ministerio de Ciencia y Tecnologia [BFU 2009.07380]
- Interuniversity Attraction Poles Programme
- Belgian Science Policy Office [P6/28, P7/13]
- French Community of Belgium
- Fund for Medical Scientific Research (Belgium)
- Ministerio de Ciencia e Innovacion
- FRIA (Fonds pour la formation a la Recherche dans l'Industrie et dans l'Agriculture), Belgium
PFK-2/FBPase-2 (6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase) catalyses the synthesis and degradation of Fru-2,6-P-2 (fructose 2,6-bisphosphate), a key modulator of glycolysis and gluconeogenesis. The PFKFB3 gene is involved in cell proliferation owing to its role in carbohydrate metabolism. In the present study we analysed the mechanism of regulation of PFKFB3 as an immediate early gene controlled by stress stimuli that activates the p38/MK2 [MAPK (mitogen-activated protein kinase)-activated protein kinase 2] pathway. We report that exposure of He La and T98G cells to different stress stimuli (NaCl, H2O2, UV radiation and anisomycin) leads to a rapid increase (15-30 mm) in PFKFB3 mRNA levels. The use of specific inhibitors in combination with MK2-deficient cells implicate control by the protein kinase MK2. Transient transfection of HeLa cells with deleted gene promoter constructs allowed us to identify an SRE (serum-response element) to which SRF (serum-response factor) binds and thus transactivates PFKFB3 gene transcription. Direct binding of phospho-SRF to the SRE sequence (- 918 nt) was confirmed by ChIP (chromatin immunoprecipitation) assays. Moreover, PFKFB3 isoenzyme phosphorylation at Ser(461) by MK2 increases PFK-2 activity. Taken together, the results of the present study suggest a multimodal mechanism of stress stimuli affecting PFKFB3 transcriptional regulation and kinase activation by protein phosphorylation, resulting in an increase in Fru-2,6-P-2 concentration and stimulation of glycolysis in cancer cells.
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