GSE162705
Impact of short- and long-term extracellular acidosis on gene expression of tumors in vitro and in vivo
Purpose: The aim of the study was to analyze the impact of acidic pHe on gene expression in two experimental tumor lines of the rat in vitro and in vivo. The results of short-term incubation (24 h) were compared to chronically acidosis-adapted cells (5 weeks). Methods: Gene expression was analyzed in AT1 prostate and Walker-256 mammary carcinoma of the rat. Cells were exposed to pH 7.4 and 6.6 for 24 h or 5 weeks. Experimental tumors were implanted in rats and control tumors were compared to tumors in which the glycolytic metabolism was intensified. Results: The analyses revealed that 147 genes were uniformly regulated in both cell lines (in vitro) and 79 genes in both experimental tumors after 24 h at low pH. 265 genes were uniformly regulated during long- and short-term exposure to low pH. Overall design: Exposure of two different tumor cell lines to pH 7.4 and 6.6 in cell culture and solid experimental tumors. Adaptation of one tumor cell line to pH 6.6 of 11 passages (=5 weeks).