Epigallocatechin gallate sensitizes cisplatin‐resistant oral cancer CAR cell apoptosis and autophagy through stimulating AKT/STAT3 pathway and suppressing multidrug resistance 1 signaling

Epigallocatechin gallate (EGCG) is a green tea polyphenol that presents anticancer activities in multiple cancer cells, but no available report was addressed for the underling molecular mechanism of cytotoxic impacts on drug‐resistant oral squamous cell carcinoma cells. In the present study, the inh...

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Veröffentlicht in:Environmental toxicology 2017-03, Vol.32 (3), p.845-855
Hauptverfasser: Yuan, Chien‐Han, Horng, Chi‐Ting, Lee, Chiu‐Fang, Chiang, Ni‐Na, Tsai, Fuu‐Jen, Lu, Chi‐Cheng, Chiang, Jo‐Hua, Hsu, Yuan‐Man, Yang, Jai‐Sing, Chen, Fu‐An
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container_issue 3
container_start_page 845
container_title Environmental toxicology
container_volume 32
creator Yuan, Chien‐Han
Horng, Chi‐Ting
Lee, Chiu‐Fang
Chiang, Ni‐Na
Tsai, Fuu‐Jen
Lu, Chi‐Cheng
Chiang, Jo‐Hua
Hsu, Yuan‐Man
Yang, Jai‐Sing
Chen, Fu‐An
description Epigallocatechin gallate (EGCG) is a green tea polyphenol that presents anticancer activities in multiple cancer cells, but no available report was addressed for the underling molecular mechanism of cytotoxic impacts on drug‐resistant oral squamous cell carcinoma cells. In the present study, the inhibitory effects of EGCG were experienced on cisplatin‐resistant oral cancer CAR cells. EGCG inhibited cell viability in a time‐ and concentration‐dependent manner by a sulforhodamine B (SRB) assay. EGCG induced CAR cell apoptosis and autophagy by 4′,6‐diamidino‐2‐phenylindole (DAPI) dye, acridine orange (AO) staining and green fluorescent protein (GFP)‐tagged LC3B assay, respectively. EGCG also significantly enhanced caspase‐9 and caspase‐3 activities by caspase activity assay. EGCG markedly increased the protein levels of Bax, cleaved caspase‐9, cleaved caspase‐3, Atg5, Atg7, Atg12, Beclin‐1, and LC3B‐II, as well as significantly decreased the expression of Bcl‐2, phosphorylated AKT (Ser473) and phosphorylation of STAT3 on Tyr705 by western blotting in CAR cells. Importantly, the protein and gene expression of multidrug resistance 1 (MDR1) were dose‐dependently inhibited by EGCG. Overall, downregulation of MDR1 levels and alterations of AKT/STAT3 signaling contributed to EGCG‐induced apoptosis and autophagy in CAR cells. Based on these results, EGCG has the potential for therapeutic effect on oral cancer and may be useful for long‐term oral cancer prevention in the future. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 845–855, 2017.
doi_str_mv 10.1002/tox.22284
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Overall, downregulation of MDR1 levels and alterations of AKT/STAT3 signaling contributed to EGCG‐induced apoptosis and autophagy in CAR cells. Based on these results, EGCG has the potential for therapeutic effect on oral cancer and may be useful for long‐term oral cancer prevention in the future. © 2016 Wiley Periodicals, Inc. 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In the present study, the inhibitory effects of EGCG were experienced on cisplatin‐resistant oral cancer CAR cells. EGCG inhibited cell viability in a time‐ and concentration‐dependent manner by a sulforhodamine B (SRB) assay. EGCG induced CAR cell apoptosis and autophagy by 4′,6‐diamidino‐2‐phenylindole (DAPI) dye, acridine orange (AO) staining and green fluorescent protein (GFP)‐tagged LC3B assay, respectively. EGCG also significantly enhanced caspase‐9 and caspase‐3 activities by caspase activity assay. EGCG markedly increased the protein levels of Bax, cleaved caspase‐9, cleaved caspase‐3, Atg5, Atg7, Atg12, Beclin‐1, and LC3B‐II, as well as significantly decreased the expression of Bcl‐2, phosphorylated AKT (Ser473) and phosphorylation of STAT3 on Tyr705 by western blotting in CAR cells. Importantly, the protein and gene expression of multidrug resistance 1 (MDR1) were dose‐dependently inhibited by EGCG. 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In the present study, the inhibitory effects of EGCG were experienced on cisplatin‐resistant oral cancer CAR cells. EGCG inhibited cell viability in a time‐ and concentration‐dependent manner by a sulforhodamine B (SRB) assay. EGCG induced CAR cell apoptosis and autophagy by 4′,6‐diamidino‐2‐phenylindole (DAPI) dye, acridine orange (AO) staining and green fluorescent protein (GFP)‐tagged LC3B assay, respectively. EGCG also significantly enhanced caspase‐9 and caspase‐3 activities by caspase activity assay. EGCG markedly increased the protein levels of Bax, cleaved caspase‐9, cleaved caspase‐3, Atg5, Atg7, Atg12, Beclin‐1, and LC3B‐II, as well as significantly decreased the expression of Bcl‐2, phosphorylated AKT (Ser473) and phosphorylation of STAT3 on Tyr705 by western blotting in CAR cells. Importantly, the protein and gene expression of multidrug resistance 1 (MDR1) were dose‐dependently inhibited by EGCG. Overall, downregulation of MDR1 levels and alterations of AKT/STAT3 signaling contributed to EGCG‐induced apoptosis and autophagy in CAR cells. Based on these results, EGCG has the potential for therapeutic effect on oral cancer and may be useful for long‐term oral cancer prevention in the future. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 845–855, 2017.</abstract><cop>United States</cop><pub>Wiley Subscription Services, Inc</pub><pmid>27200496</pmid><doi>10.1002/tox.22284</doi><tpages>11</tpages></addata></record>
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subjects AKT/STAT3 signaling
apoptosis
Apoptosis - drug effects
Apoptosis Regulatory Proteins - metabolism
ATP-Binding Cassette, Sub-Family B, Member 1 - genetics
ATP-Binding Cassette, Sub-Family B, Member 1 - metabolism
autophagy
Autophagy - drug effects
Autophagy-Related Proteins - metabolism
Caspase 3 - metabolism
Caspase 9 - metabolism
Catechin - analogs & derivatives
Catechin - pharmacology
Cell Line, Tumor
Cisplatin - pharmacology
Cisplatin - toxicity
Down-Regulation - drug effects
epigallocatechin gallate
Humans
MDR1
Microscopy, Fluorescence
Mouth Neoplasms - metabolism
Mouth Neoplasms - pathology
Phosphorylation - drug effects
Proto-Oncogene Proteins c-akt - metabolism
Signal Transduction - drug effects
STAT3 Transcription Factor - metabolism
title Epigallocatechin gallate sensitizes cisplatin‐resistant oral cancer CAR cell apoptosis and autophagy through stimulating AKT/STAT3 pathway and suppressing multidrug resistance 1 signaling
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