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. 1996 Aug;224(2):189–197. doi: 10.1097/00000658-199608000-00012

Glutamine as a regulator of DNA and protein biosynthesis in human solid tumor cell lines.

M Wasa 1, B P Bode 1, S F Abcouwer 1, C L Collins 1, K K Tanabe 1, W W Souba 1
PMCID: PMC1235341  PMID: 8757383

Abstract

OBJECTIVE: The transport of glutamine by six different human solid tumor-derived cell lines (e.g., breast, colon, liver) was characterized and the impact of glutamine deprivation on rates of tumor cell proliferation and DNA and protein synthesis was assayed. SUMMARY BACKGROUND DATA: Glutamine is added routinely to cell culture media and its importance for cellular growth has been established. However, carrier-mediated glutamine transport by solid tumors has not been studied extensively, and the mechanisms by which glutamine contributes to cell growth regulation require further investigation. METHODS: In a panel of different human solid tumor-derived cells, sodium-dependent glutamine transport was characterized in vitro and rates of cell proliferation, protein and DNA synthesis, as well as thymidine transport, were correlated with glutamine concentrations in the culture media. RESULTS: In all cells, regardless of tissue origin, sodium-dependent glutamine transport was mediated almost exclusively by a single carrier. There was a range of Michaelis constants (Km) and maximal transport velocities (Vmax) for the glutamine transporter in each cell type, but the amino acid inhibition profiles were nearly identical, consistent with uptake by the System ASC family of transporters. Rates of cell growth, DNA and protein synthesis, and thymidine transport correlated with the glutamine concentration in the culture media, indicating the central role of this amino acid in regulating cellular proliferation. CONCLUSIONS: These data indicate that glutamine transport by all solid tumors is mediated by the System ASC family of transporters. The variation in Km values suggests that some cancers may be better suited to survive in a low glutamine environment than others. The mechanism by which glutamine supports cell proliferation and regulates cell cycle kinetics involves its modulation of DNA and protein biosynthetic rates.

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Selected References

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