Abstract
Aim:
TREK-1 (TWIK-related K+ channel-1) is a 2-pore-domain K+ channel subtype. The present study investigated the role of TREK-1 in cell death induced by oxidative stress.
Methods:
The cell viability of wild-type Chinese hamster ovary (CHO) and TREK-1-transfected CHO cells (TREK-1/CHO cells) was measured using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay in the presence of sodium nitroprusside (SNP) or hydrogen peroxide (H2O2). Apoptosis of wild-type CHO and TREK-1/CHO cells was detected using Hoechst33342 staining.
Results:
Both SNP and H2O2 caused dose- and time-dependent growth inhibition of wild-type CHO and TREK-1/CHO cells. Following a 12 h exposure to SNP, the 50% inhibition (IC50) values for wild-type CHO and TREK-1/CHO cells were calculated as 0.69 mmol/L and 1.14 mmol/L, respectively. The IC50 values were 0.07 mmol/L and 0.09 mmol/L in H2O2-treated wild-type CHO and TREK-1/CHO cells, respectively, following 12 h exposure to H2O2. Moreover, SNP/H2O2 induced less apoptosis in TREK-1/CHO cells than that in wild-type CHO cells (P<0.05).
Conclusion:
The results demonstrated that TREK-1 played a protective role against oxidative injury.
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This study was supported by National 973 Fundamental Project of China (No 2004CB518906); National Natural Science Foundation of China (No 30640096); Program for Changjiang Scholars and Innovative Research Team in University (No IRT0514); Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education.
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Sun, Ln., Li, Ll., Li, Zb. et al. Protective effects of TREK-1 against oxidative injury induced by SNP and H2O2. Acta Pharmacol Sin 29, 1150–1156 (2008). https://doi.org/10.1111/j.1745-7254.2008.00853.x
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DOI: https://doi.org/10.1111/j.1745-7254.2008.00853.x