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        Autophagy inhibition contributes to epigallocatechin-3-gallate-mediated apoptosis in papillary thyroid cancer cells

        Bu Ling,Zheng Tingting,Mao Chaoming,Fei Wu,Mou Xiao,Xu Chengcheng,Luo Xuan,Lu Qingyan,Dong Liyang,Wang Xuefeng 대한독성 유전단백체 학회 2021 Molecular & cellular toxicology Vol.17 No.4

        Background Epigallocatechin-3-gallate is a natural polyphenolic compound that induces apoptosis in papillary thyroid cancer cells. However, its underlying molecular mechanism was not completely clarified. Objectives The present study demonstrated the role of apoptosis and autophagy in EGCG-treated papillary thyroid cancer cells and the relationship between these processes. Results EGCG significantly suppressed the viability of TPC-1 papillary thyroid cancer cells at an IC50 of 17.2 μM. EGCG induced TPC-1 cell apoptosis and cell cycle arrest at S phase and downregulated the protein expression of cyclin A and cyclin-dependent kinase-2. EGCG decreased reactive oxygen species levels, upregulated Bax expression, downregulated Bcl-2 expression and increased cytochrome C levels in the cytosol. Treatment with EGCG also increased the levels of cleaved caspase 3, cleaved caspase 9 and cleaved poly(ADP-ribose) polymerase. EGCG induced an autophagic response via the upregulation of the autophagy-related protein LC3-II and suppression of the AKT/mTOR signalling pathway. Autophagy inhibition further enhanced EGCG-induced cell apoptosis and ROS suppression, which indicated that autophagy played a cytoprotective role in EGCG-treated TPC-1 cells. Conclusion Taken together, these results demonstrated that autophagy inhibition was beneficial to EGCG–mediated apoptosis in papillary thyroid cancer cells. Background Epigallocatechin-3-gallate is a natural polyphenolic compound that induces apoptosis in papillary thyroid cancer cells. However, its underlying molecular mechanism was not completely clarified. Objectives The present study demonstrated the role of apoptosis and autophagy in EGCG-treated papillary thyroid cancer cells and the relationship between these processes. Results EGCG significantly suppressed the viability of TPC-1 papillary thyroid cancer cells at an IC50 of 17.2 μM. EGCG induced TPC-1 cell apoptosis and cell cycle arrest at S phase and downregulated the protein expression of cyclin A and cyclin-dependent kinase-2. EGCG decreased reactive oxygen species levels, upregulated Bax expression, downregulated Bcl-2 expression and increased cytochrome C levels in the cytosol. Treatment with EGCG also increased the levels of cleaved caspase 3, cleaved caspase 9 and cleaved poly(ADP-ribose) polymerase. EGCG induced an autophagic response via the upregulation of the autophagy-related protein LC3-II and suppression of the AKT/mTOR signalling pathway. Autophagy inhibition further enhanced EGCG-induced cell apoptosis and ROS suppression, which indicated that autophagy played a cytoprotective role in EGCG-treated TPC-1 cells. Conclusion Taken together, these results demonstrated that autophagy inhibition was beneficial to EGCG–mediated apoptosis in papillary thyroid cancer cells.

      • The Value of China Steam Coal Supply Chain Information Sharing and Impact of Lead-Time and Seasonal Factor

        Li Yang,Dong Mu,Chao Wang 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.9

        The steam coal supply chain has the problem that the member’s inventory level cannot change with the market demand. The main reason is that market demand information has not been shared in the supply chain members. This paper considers the steam coal supply chain which consists of one coal manufacturer and one fire power plant, with the assumption that the steam coal demand follows a seasonal autoregressive moving average process, including marketing actions that cannot be deduced form the other parameters of the demand process. We compare the optimal inventory level of the steam coal manufacturer and the power plant in two scenarios and analyses the reasons that influence the value of the information sharing in the steam coal supply chain. It demonstrates that the seasonal effect and lead-time have an important impact on optimal inventory policy. This result provides managers of steam coal manufacturers and power plant with insights to establish strategic partnership to promote the performance of the whole supply chain.

      • Supply Chain Information Sharing of Third-Level Coal Enterprises with Evaluation of Decision-Making Bias

        Li Yang,Dong Mu 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.12

        Information sharing can reduce bullwhip effect on the supply chain of coal enterprises. This paper explores supply chain information sharing of three-level coal enterprises when there are decision-making biases; establishes supply chain model of third-level coal enterprises composed by coal-producing enterprises, coking coal-producing enterprises, and coal-demand enterprises; and analyzes the influential factors of information sharing value for coal enterprises with three types of conditions.

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        Wireless Synchronous Transfer of Power and Reverse Signals

        Li, Yang,Li, Yumei,Feng, Shaojie,Yang, Qingxin,Dong, Weihao,Zhao, Jingtai,Xue, Ming The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3

        Wireless power transfer via coupled magnetic resonances has been a hot research topic in recent years. In addition, the number of related devices has also been increasing. However, reverse signals transfer is often required in addition to wireless power transfer. The structure of the circuit for a wireless power transfer system via coupled magnetic resonances is analyzed. The advantages and disadvantages of both parallel compensation and series compensation are listed. Then the compensation characteristics of the inductor, capacitor and resistor were studied and an appropriate compensation method was selected. The reverse signals can be transferred by controlling the compensation of the resistor. In addition, it can be demodulated by extracting the change of the primary current. A 3.3 MHz resonant frequency with a 100 kHz reverse signals transfer system platform was established in the laboratory. Experimental results demonstrate that wireless power and reverse signals can be transferred synchronously.

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