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• W2061542218 abstract "Solid malignant tumours are characterised by an inadequate vascular system, which can give rise to micro-regional hypoxic areas. As the negative impact of tumour hypoxia is believed largely to depend on dynamic changes in gene expression, it is important to identify the genes regulated by hypoxia to further enlighten the biology behind the cellular response to hypoxia. Previous studies have demonstrated that hypoxia has an impact not only on the gene transcription, but also on gene-specific mRNA translation. Therefore, proteomics is a suitable approach to understand the complexity of gene regulation under hypoxia at protein level. In this in vitro study we have studied the proteome of cells under intermediate hypoxia (1% O2) and anoxia and compared these to normoxic (21% O2) cells to identify proteins upregulated by mild and severe hypoxia.A human cervix cancer cell line (SiHa) and a human head and neck cancer cell line (FaDu(DD)) were used. Total cell lysate from hypoxic and normoxic cells was separated by 2-dimensional gel electrophoresis, and images were analysed using Quantity One software. Proteins from significant spots (difference in intensity by more than a factor 2) were identified by Liquid chromatography-mass spectrometry (LC-MS/MS). In order to confirm the hypoxic regulation of the identified proteins, immunoblotting and qPCR were employed when possible.All together 32 spots were found to be upregulated in the hypoxic gels. Of these, 11 different proteins were successfully identified and largely confirmed by Western blotting and qPCR. Amongst these proteins are protein disulfide isomerase family A, member 6 (PDIA6) and dynein light chain roadblock-type 1 (DynLRB1). Both 2D gels and Western blots revealed that PDAI6 exhibited a cell line specific pattern; in FaDu(DD) there was upregulation at 1% and further upregulated at 0% compared to atmospheric air, whereas there was no upregulation in SiHa cells. DynLRB1 was found to be upregulated in FaDu(DD) at both 1% and 0% oxygen.The upregulated proteins observed in this study are involved in different cellular processes, as regulators of both cell metabolism and stress response, and in cell migration and cell division. All of which may contribute to cell survival and adaptation during oxygen starvation." @default.
• W2061542218 created "2016-06-24" @default.
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• W2061542218 date "2009-09-01" @default.
• W2061542218 modified "2023-10-18" @default.
• W2061542218 title "Proteins upregulated by mild and severe hypoxia in squamous cell carcinomas in vitro identified by proteomics" @default.
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• W2061542218 doi "https://doi.org/10.1016/j.radonc.2009.05.019" @default.
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• W2061542218 hasPublicationYear "2009" @default.
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