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Glutamate-cysteine ligase catalytic subunit is associated with cisplatin resistance in lung adenocarcinoma.


ABSTRACT: Background:Cisplatin is a key drug for treating lung adenocarcinoma, and its sensitivity to cisplatin is directly related to prognosis. We aimed to reveal the roles of genes related to glutathione synthesis (glutamate-cysteine ligase catalytic subunit, GCLC) and cystine uptake (cystine/glutamate transporter, xCT and CD44v8-10) in cisplatin resistance and prognosis in lung adenocarcinoma. Methods:We established cell lines stably expressing GCLC, xCT, standard isoform of CD44, and CD44v8-10, and investigated their sensitivities to cisplatin. We also measured mRNA expression levels of these genes in the tumor tissues from 92 lung adenocarcinoma patients. Patients were divided into high-expression (upper quartile, N = 23) and low-expression groups (remaining patients, N = 69). Recurrence-free survival, overall survival (N = 92), and post-recurrence survival (N = 22) were selected as endpoints. Results:Compared with the control green fluorescent protein-expressing cell line (inhibitory concentration 50:6.9 ?M), all the stable cell lines were more resistant to cisplatin (12.9 ?M, P = 0.025; 13.9 ?M, P = 0.028; 26.7 ?M, P = 0.001; 17.7 ?M, P = 0.008, respectively). In contrast, there was no significant difference in recurrence-free or overall survival between the high- and low-expression groups for any of the genes. However, high expression of GCLC was a risk factor for poorer post-recurrence survival (hazard ratio, 6.26; 95% confidence interval, 1.37-28.7; P = 0.018). Conclusion:High expression levels of genes related to glutathione synthesis and cystine uptake promote cisplatin resistance in lung adenocarcinoma cell lines. High expression of GCLC in tumor tissue may be a potential predictor of treatment failure.

SUBMITTER: Hiyama N 

PROVIDER: S-EPMC5892860 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature

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Glutamate-cysteine ligase catalytic subunit is associated with cisplatin resistance in lung adenocarcinoma.

Hiyama Noriko N   Ando Takahiro T   Maemura Keita K   Sakatani Toshio T   Amano Yosuke Y   Watanabe Kousuke K   Kage Hidenori H   Yatomi Yutaka Y   Nagase Takahide T   Nakajima Jun J   Takai Daiya D  

Japanese journal of clinical oncology 20180401 4


<h4>Background</h4>Cisplatin is a key drug for treating lung adenocarcinoma, and its sensitivity to cisplatin is directly related to prognosis. We aimed to reveal the roles of genes related to glutathione synthesis (glutamate-cysteine ligase catalytic subunit, GCLC) and cystine uptake (cystine/glutamate transporter, xCT and CD44v8-10) in cisplatin resistance and prognosis in lung adenocarcinoma.<h4>Methods</h4>We established cell lines stably expressing GCLC, xCT, standard isoform of CD44, and C  ...[more]

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