Acetylation mediated by the p300/CBP-associated factor determines cellular energy metabolic pathways in cancer

Rajendran,Ramkumar; Garva,Richa; Ashour,Hassan; Leung,Travis; Stratford,Ian; Krstic-Demonacos,Marija; Demonacos,Constantinos

doi:10.3892/ijo.2013.1907

Acetylation mediated by the p300/CBP-associated factor determines cellular energy metabolic pathways in cancer

Authors:
- Ramkumar Rajendran
- Richa Garva
- Hassan Ashour
- Travis Leung
- Ian Stratford
- Marija Krstic-Demonacos
- Constantinos Demonacos
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Affiliations: School of Pharmacy and Pharmaceutical Sciences, Stopford Building, University of Manchester, Manchester, M13 9PT, UK, Faculty of Life Sciences, Michael Smith Building, University of Manchester, Manchester, M13 9PT, UK
Published online on: April 17, 2013 https://doi.org/10.3892/ijo.2013.1907
Pages: 1961-1972

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Abstract

Normal cells produce energy either through OXPHOS in the presence of oxygen or glycolysis in its absence. Cancer cells produce energy preferably through glycolysis even in the presence of oxygen, thereby, acquiring survival and proliferative advantages. Oncogenes and tumour suppressors control these metabolic pathways by regulating the expression of their target genes involved in these processes. During hypoxia, HIF-1 favours high glycolytic flux by upregulating glycolytic enzymes. Conversely, p53 inhibits glycolysis and increases OXPHOS expression through TIGAR and SCO2 gene expression, respectively. We hypothesise that the p300/CBP-associated factor (PCAF) as a common co-factor shared between p53 and HIF-1 plays an important role in the regulation of energy production by modulating SCO2 and TIGAR gene expression mediated by these two transcription factors. The possible involvement of HIF-1 in the regulation of SCO2 and TIGAR gene expression was investigated in cells with different p53 status in normoxia- and hypoxia-mimicking conditions. Putative hypoxia response elements (HREs) were identified in the regulatory region of SCO2 and TIGAR gene promoters. Chromatin immunoprecipitation experiments suggested that HIF-1 was recruited to the putative HREs present in the SCO2 and TIGAR promoters in a cell type-dependent manner. Transcriptional assays endorsed the notion that PCAF may be involved in the determination of the SCO2 and TIGAR cellular levels, thereby, regulating cellular energy metabolism, a view supported by assays measuring lactic acid production and oxygen consumption in cells ectopically expressing PCAF. The present study identified HIF-1 as a potential regulator of SCO2 and TIGAR gene expression. Furthermore, evidence to suggest that PCAF is involved in the regulation of cellular energy production pathways in hypoxia-mimicking conditions is presented. This effect of PCAF is exerted by orchestrating differential recruitment of HIF-1α and p53 to the promoter of TIGAR and/or SCO2 genes, thereby, tailoring physiological needs and environmental conditions to SCO2 and TIGAR gene expression.

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