SNAT2/SLC38A2 Confers the Stemness of Gastric Cancer Cells via Regulating Glutamine Level (2025)

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Nie, K.; Cai, M.

Digestive Diseases and Sciences 67(7): 2948-2956

2022

ISSN/ISBN: 1573-2568 PMID: 34173116 DOI:10.1007/s10620-021-07110-2
Accession:079245914

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Summary

Glutamine (Gln) is essential for cancer progression, however, few studies have been conducted to investigate the roles of Gln transporters in gastric cancer stem cells (CSCs). This work aims to explore the roles of Gln transporters in gastric cancer cell stemness. We collected spheres formed by gastric cancer (GC) cells through a 3-dimensional (3D) semisolid culture system which has been shown to hold CSC-like traits. Lentivirus package was used to construct GC cells with SNAT2 overexpression. Analysis of sphere-formation, stemness marker expression, ALDH activity were used to detect the effects of Gln transporters on GC cell stemness. Determination of reactive oxygen species (ROS) and Gln consumption combined with the methods analyzing cell stemness were performed to explore the underlying mechanisms. Gln consumption was upregulated in GC spheres compared to the parental GC cells. The Gln transporter SNAT2 was highly expressed in GC spheres compared to that in the parental GC cells. SNAT2 overexpression significantly increased the Gln consumption in GC cells and increased the expression of stemness markers, sphere-formation ability and ALDH activity. Notably, SNAT2-mediated promoting effects on GC cell stemness were rescued by Gln deprivation. What's more, high expression of SNAT2 was associated with a poor GC patient survival through different online datasets. SNAT2 can promote the stemness of GC cells in a Gln-dependent manner.

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