Level of M2-pyruvate kinase in pancreatic cancer cells is influenced by acidic pH, glucose deprivation and hypoxia

Life Sciences 2007 (2007) Proc Life Sciences, PC312

Poster Communications: Level of M2-pyruvate kinase in pancreatic cancer cells is influenced by acidic pH, glucose deprivation and hypoxia

Y. Kumar1, S. Yang1, B. Fuller1, B. R. Davidson1

1. Genaral Surgery, Royal Free and University College Medical School, London, United Kingdom.

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Hypoxic and nutritionally deprived areas are thought to contribute to resistance of tumour cells to apoptosis in pancreatic cancers. Tumour M2-pyruvate kinase, a tumour associated isoenzyme of pyruvate kinase, is elevated in patients with pancreatic cancer. This study aims to measure tumour M2-pyruvate kinase (TuM2-PK) in different human pancreatic cancer cell line following exposure to acidic pH, glucose deprived and hypoxic conditions. TuM2-PK expression was measured in cell lysate supernatant of HMEF, MCF7, Panc 1 and Colo357 human cell lines using sandwich type ELISA (ScheBo® Tumour M2-PK™) and Western blot. Panc1 and Colo 357 were grown in acidic pH (6.5), glucose free medium (DMEM)and hypoxic (1% Oxygen) condition. TuM2-PK was expressed as mUnits/million cells. Mean TuM2-PK values between different cell lines were compared using two-way ANOVA and unpaired T test. Correlation between TuM2-PK levels and cell densities was made using Pearson’s coefficient. M2-PK expression was significantly higher in Colo357 cells compared to HMEF, MCF 7 (p<0.05) and Panc 1 cells (p<0.001). Correlation between TuM2-PK levels and different cell densities was negative[MCF7 (r=-0.382, p=0.06), Panc-1 (r=-0.096, p=0.065) and Colo357 (r-0.528, p<0.01). Tumour M2-PK expression was significantly enhanced in Colo357 cells (p<0.05) at acidic pH or glucose deprived or hypoxic condition in the culture medium compared to normal conditions. TuM2-PK can be measured in different cell lines using ELISA. In-vitro expression of TuM2-PK correlates with low cell density. Acidic, glucose deprived and hypoxic conditions around tumour cells enhances M2-PK expression.



Where applicable, experiments conform with Society ethical requirements.

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