High concentrations of ascorbic acid, through H(2)O(2),  induces apoptosis of human gastric cancer cell by p38-MAP kinase-dependent up-regulation of transferrin receptor

 

Article in Cancer letters 277(1):48-54 , May 2009 with 22 Reads

DOI: 10.1016/j.canlet.2008.11.020 , Source: PubMed

 

We investigated the molecular mechanism by which ascorbic acid (AA) induces apoptosis in human gastric cancer cells, AGS cells. High concentration (more than 5mM) of AA increased cellular iron uptake by increasing transferrin receptor (TfR) expression and induced AGS cell apoptosis which was inhibited by catalase. Interestingly, p38 mitogen-activated protein kinase (MAPK) inhibitor inhibited the upregulation of TfR and increased cell survival by AA. TfR-siRNA-transfected cells reduced apoptosis by AA. H(2)O(2) increased TfR expression in AGS cells. Taken together, we concluded that high concentration of AA, through H(2)O(2), induces apoptosis of AGS cells by p38-MAPK-dependent upregulation of TfR.

 

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