Abstract
In addition to the altered amino acids in many cancer cells for their uncontrolled growth, targeted metabolomics in cell culture media could display a dynamic interaction between cancer cells and their micro-environments. Methodology for cell culture medium samples is different from that of cell lysates on sampling points, calculation and statistical analysis. Targeted profiling method of 40 amino acid and derivatives was validated and performed on cell culture medium samples from cell lines of HCC 1806 (breast cancer cell) and MCF-10A (normal breast epithelial cell). Different from the common up-regulation of amino acids in cancer cell lysates, significantly increased uptake (>2.5-fold, VIP>1 and p < 0.001) of branched amino acids was observed in the cell culture media from the breast cancer cells while acetylmethionine, cysteine-glutathione, glutathione, cysteine and glutamic acid were excreted significantly more by the cancer cells to their media. The characteristic metabolic changes of amino acid and derivatives in the cell culture media provide a dynamic portrayal for the interaction of the breast cancer cells, normal breast cells with their micro-environments, which helps to understand the underlying proliferation mechanism of breast cancer cells.
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