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Liu T, Zhang Z, Yu C, Zeng C, Xu X, Wu G, Huang Z, Li W. Tetrandrine antagonizes acute megakaryoblastic leukaemia growth by forcing autophagy-mediated differentiation. Br J Pharmacol 2017; 174:4308-4328. [PMID: 28901537 DOI: 10.1111/bph.14031] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 08/27/2017] [Accepted: 08/31/2017] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND AND PURPOSE The poor prognosis of acute megakaryoblastic leukaemia (AMKL) means there is a need to develop novel therapeutic methods to treat this condition. It was recently shown that inducing megakaryoblasts to undergo terminal differentiation is effective as a treatment for AMKL. This encouraged us to identify a compound that induces megakaryocyte differentiation, which could then act as a potent anti-leukaemia agent. EXPERIMENTAL APPROACH The effects of tetrandrine on the expression of CD41 and cell morphology were investigated in AMKL cells. We used CRISPR/Cas9 knockout system to knock out ATG7 and verify the role of autophagy in tetrandrine-induced megakaryocyte differentiation. shNotch1 and CA-Akt were transfected into K562 cells to examine the downstream pathways of ROS signalling and the mechanistic basis of the tetrandrine-induced megakaryocyte differentiation. The anti-leukaemia effects of tetrandrine were analysed both in vitro and in vivo. KEY RESULTS A low dose of tetrandrine induced cell cycle arrest and megakaryocyte differentiation in AMKL cells via activation of autophagy. Molecularly, we demonstrated that this effect is mediated by activation of Notch1 and Akt and subsequent accumulation of ROS. In contrast, in normal mouse fetal liver cells, although tetrandrine induced autophagy, it did not affect cell proliferation or promote megakaryocyte differentiation, suggesting a specific effect of tetrandrine in malignant megakaryoblasts. Finally, tetrandrine also showed in vivo efficacy in an AMKL xenograft mouse model. CONCLUSIONS AND IMPLICATIONS Modulating autophagy-mediated differentiation may be a novel strategy for treating AMKL, and tetrandrine has the potential to be developed as a differentiation-inducing agent for AMKL chemotherapy.
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Affiliation(s)
- Ting Liu
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Zhenxing Zhang
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Chunjie Yu
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Chang Zeng
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Xiaoqing Xu
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Guixian Wu
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Zan Huang
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
| | - Wenhua Li
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China
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ROS generation and JNK activation contribute to 4-methoxy-TEMPO-induced cytotoxicity, autophagy, and DNA damage in HepG2 cells. Arch Toxicol 2017; 92:717-728. [PMID: 28993908 DOI: 10.1007/s00204-017-2084-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 09/26/2017] [Indexed: 01/01/2023]
Abstract
4-Methoxy-TEMPO, a derivative of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), is a stable nitroxide radical and is generally used in organic and pharmaceutical syntheses for the oxidation of alcohols. Previously, we reported the involvement of reactive oxygen species (ROS) and c-Jun N-terminal kinases (JNK) in TEMPO-induced apoptosis in mouse L5178Y cells. In this study, we investigated 4-methoxy-TEMPO induced toxicity in human HepG2 hepatoma cells and its underlying mechanisms. Treatments with 4-methoxy-TEMPO (0.5-5 mM for 2-6 h) caused oxidative stress as demonstrated by increased intensity of the ROS indicator H2DCF-DA, decreased levels of glutathione. 4-Methoxy-TEMPO treatment also induced DNA damage as characterized by increased levels of DNA tail intensity in the Comet assay, increased phosphorylation of related proteins including γ-H2A.X, p-Chk1, and p-Chk2, and activation of MAPK signaling pathways. In addition, 4-methoxy-TEMPO also induced autophagy as demonstrated by the conversion of LC3B-I to II, decreased level of p62, and the appearance of GFP-LC3B punctae. To investigate the crosstalk between different signaling pathways, pretreatment of HepG2 with N-acetylcysteine, an ROS scavenger, attenuated 4-methoxy-TEMPO-induced DNA damage, suppressed JNK activation, and diminished autophagy induction. Furthermore, inhibiting JNK activation by a JNK-specific inhibitor, SP600125, decreased DNA damage levels induced by 4-methoxy-TEMPO. These results suggest that multiple mechanisms including ROS generation, DNA damage, and MAPK activation contribute to 4-methoxy-TEMPO-induced toxicity.
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Kou B, Liu W, Xu X, Yang Y, Yi Q, Guo F, Li J, Zhou J, Kou Q. Autophagy induction enhances tetrandrine-induced apoptosis via the AMPK/mTOR pathway in human bladder cancer cells. Oncol Rep 2017; 38:3137-3143. [PMID: 29048631 DOI: 10.3892/or.2017.5988] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 08/23/2017] [Indexed: 11/06/2022] Open
Abstract
Tetrandrine, a bisbenzylisoquinoline alkaloid isolated from the roots of Stephania tetrandra is a traditional Chinese medicine and exerts anticancer capacity in various types of cancers. Previous studies have shown that tetrandrine induces apoptosis in bladder cancer cells via activation of the caspase cascade. However, the underlying mechanism has not yet been reported. Autophagy is a cellular process involved in the degradation of broken proteins and aging organelles to maintain homeostasis. Recent studies indicate that autophagy is implicated in cancer therapy. Thus, we focused on the correlation between autophagy and apoptosis upon tetrandrine treatment in human bladder cancer cells. Firstly, our results observed a marked increase in autophagic double-membrane vacuoles and fluorescent puncta of red fluorescence protein-green fluorescence protein-LC3 (GRP-RFP-LC3) upon tetrandrine treatment, as evidenced by transmission electron microscopy and confocal fluorescence microscopy. Secondly, the expression of LC3-II was increased in tetrandrine-treated T24 and 5637 cells in a time- and concentration-dependent manner. Subsequently, downregulation of p62 and LC3 turnover assay further confirmed that tetrandrine induced autophagic flux in bladder cancer T24 and 5637 cells. Thirdly, the protein levels of phosphorylated-AMP-activated protein kinase (AMPK) and phosphorylated-acetyl-coenzyme A carboxylase (ACC) were upregulated in the tetrandrine-treated cells, while the mammalian target of rapamycin (mTOR)-related proteins were downregulated. Moreover, AICAR, a common AMPK activator, further increased the expression the LC3-II, while AMPK inhibitor compound C partially reversed the LC3-II protein levels in bladder cancer T24 cells. Finally, AICAR significantly reinforced the growth inhibition and apoptosis induction of tetrandrine in T24 and 5637 cells, while compound C had an opposite effect, suggesting that AMPK-mediated autophagy enhanced the cytotoxic and pro-apoptosis effect of tetrandrine in human bladder cancer cells. Taken together, the present study showed that tetrandrine induced autophagy in human bladder cancer cells by regulating the AMPK/mTOR signaling pathway, which contributed to the apoptosis induction by tetrandrine, indicating that tetrandrine may be a potential anticancer candidate for the treatment of bladder cancer, and autophagy may be a possible mechanism for cancer therapy.
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Affiliation(s)
- Bo Kou
- Department of Cadiovascular Sugery, First Affiliated Hospital of the Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Wei Liu
- Department of Urology, First Affiliated Hospital of the Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Xu Xu
- Department of Human Resources, First Affiliated Hospital of the Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Yang Yang
- Department of Cadiovascular Sugery, First Affiliated Hospital of the Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Qiuyue Yi
- Department of Cadiovascular Sugery, First Affiliated Hospital of the Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Fengwei Guo
- Department of Cadiovascular Sugery, First Affiliated Hospital of the Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Jianpeng Li
- Department of Cadiovascular Sugery, First Affiliated Hospital of the Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Jinsong Zhou
- Department of Human Anatomy, Histology and Embryology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi 710061, P.R. China
| | - Qingshan Kou
- Medical Center, First People's Hospital of Xianyang, Xianyang, Shaanxi 712000, P.R. China
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Wu MY, Wang SF, Cai CZ, Tan JQ, Li M, Lu JJ, Chen XP, Wang YT, Zheng W, Lu JH. Natural autophagy blockers, dauricine (DAC) and daurisoline (DAS), sensitize cancer cells to camptothecin-induced toxicity. Oncotarget 2017; 8:77673-77684. [PMID: 29100416 PMCID: PMC5652807 DOI: 10.18632/oncotarget.20767] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 08/02/2017] [Indexed: 12/21/2022] Open
Abstract
Autophagy is a cellular bulk degradation pathway implicated in various diseases. Inhibition of autophagy has been regarded as a new therapeutic strategy for cancer treatment, especially in combination with chemotherapy. In our study, we identified two natural compounds, dauricine (DAC) and daurisoline (DAS), as two potent autophagy blockers through a high-content screening. DAC and DAS are alkaloids isolated from traditional Chinese medicine Rhizoma Menispermi. We systematically examined the effects of DAC and DAS on autophagy function in HeLa cells and found that DAC and DAS induced massive formation of autophagic vacuoles and lipidation of LC3. The accumulation of autophagic vacuoles and LC3 lipidation are due to blockage of autophagosome maturation as evidenced by interrupted colocalization of autophagsosome and lysosome, increased GFP-LC3/RFP-LC3 ratio and accumulation of autophagic substrate p62. Moreover, DAC and DAS impaired lysosomal function, as indicated by reduced lysosomal protease activity and increased lysosomal pH values. Importantly, we showed that DAC and DAS strongly inhibited the lysosome V-type ATPase activity. For the therapeutic potential, we found that DAC and DAS blocked the campothecin (CPT)-induced protective autophagy in HeLa cells, and dramatically sensitized the multiple cancer cells to CPT-induced cell death. In conclusion, our result shows that DAC and DAS are autophagy inhibitors which inhibit the lysosomal degradation of auophagic vacuoles, and sensitize the CPT-induced cancer cell death. The study implies the therapeutic potential of DAC and DAS in the treatment of cancers in combination of chemotherapy by inhibiting autophagy.
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Affiliation(s)
- Ming-Yue Wu
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
| | - Sheng-Fang Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
| | - Cui-Zan Cai
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
| | - Jie-Qiong Tan
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha, Hunan, China
| | - Min Li
- Mr. and Mrs. Ko Chi Ming Centre for Parkinson's Disease Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong SAR, China
| | - Jin-Jian Lu
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
| | - Xiu-Ping Chen
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
| | - Yi-Tao Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
| | - Wei Zheng
- Department of Thyroid and Breast Surgery, The Third People's Hospital of Shenzhen, Shenzhen, Guangdong, China
| | - Jia-Hong Lu
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, China
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55
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Wong VKW, Zeng W, Chen J, Yao XJ, Leung ELH, Wang QQ, Chiu P, Ko BCB, Law BYK. Tetrandrine, an Activator of Autophagy, Induces Autophagic Cell Death via PKC-α Inhibition and mTOR-Dependent Mechanisms. Front Pharmacol 2017. [PMID: 28642707 PMCID: PMC5462963 DOI: 10.3389/fphar.2017.00351] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Emerging evidence suggests the therapeutic role of autophagic modulators in cancer therapy. This study aims to identify novel traditional Chinese medicinal herbs as potential anti-tumor agents through autophagic induction, which finally lead to autophagy mediated-cell death in apoptosis-resistant cancer cells. Using bioactivity-guided purification, we identified tetrandrine (Tet) from herbal plant, Radix stephaniae tetrandrae, as an inducer of autophagy. Across a number of cancer cell lines, we found that breast cancer cells treated with tetrandrine show an increase autophagic flux and formation of autophagosomes. In addition, tetrandrine induces cell death in a panel of apoptosis-resistant cell lines that are deficient for caspase 3, caspase 7, caspase 3 and 7, or Bax-Bak respectively. We also showed that tetrandrine-induced cell death is independent of necrotic cell death. Mechanistically, tetrandrine induces autophagy that depends on mTOR inactivation. Furthermore, tetrandrine induces autophagy in a calcium/calmodulin-dependent protein kinase kinase-β (CaMKK-β), 5' AMP-activated protein kinase (AMPK) independent manner. Finally, by kinase profiling against 300 WT kinases and computational molecular docking analysis, we showed that tetrandrine is a novel PKC-α inhibitor, which lead to autophagic induction through PKC-α inactivation. This study provides detailed insights into the novel cytotoxic mechanism of an anti-tumor compound originated from the herbal plant, which may be useful in promoting autophagy mediated- cell death in cancer cell that is resistant to apoptosis.
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Affiliation(s)
- Vincent Kam Wai Wong
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and TechnologyMacau, China
| | - Wu Zeng
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and TechnologyMacau, China
| | - Juan Chen
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, The Second Affiliated Hospital of Chongqing Medical University, Chongqing Medical UniversityChongqing, China
| | - Xiao Jun Yao
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and TechnologyMacau, China
| | - Elaine Lai Han Leung
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and TechnologyMacau, China
| | - Qian Qian Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and TechnologyMacau, China
| | - Pauline Chiu
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, University of Hong KongHong Kong, China
| | - Ben C B Ko
- Department of Applied Biology and Chemical Technology, and State Key Laboratory of Chirosciences, The Hong Kong Polytechnic UniversityHong Kong, China
| | - Betty Yuen Kwan Law
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and TechnologyMacau, China
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56
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Aberrant low expression of p85α in stromal fibroblasts promotes breast cancer cell metastasis through exosome-mediated paracrine Wnt10b. Oncogene 2017; 36:4692-4705. [PMID: 28394344 PMCID: PMC5562851 DOI: 10.1038/onc.2017.100] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 02/26/2017] [Accepted: 03/03/2017] [Indexed: 12/14/2022]
Abstract
P85α, which acts as a tumour suppressor, is frequently found to be downregulated in various human cancers. However, the role of p85α in the tumour microenvironment is unknown. Here, we report that aberrantly low expression of p85α in breast cancer stroma is clinically relevant to breast cancer disease progression. Stromal fibroblasts can acquire the hallmarks of cancer-associated fibroblasts (CAFs) as a result of the loss of p85α expression. Paracrine Wnt10b from p85α-deficient fibroblasts can promote cancer progression via epithelial-to-mesenchymal transition (EMT) induced by the canonical Wnt pathway. Moreover, exosomes have a key role in paracrine Wnt10b transport from fibroblasts to breast cancer epithelial cells. Our results reveal that p85α expression in stromal fibroblasts haves a crucial role in regulating breast cancer tumourigenesis and progression by modifying stromal–epithelial crosstalk and remodelling the tumour microenvironment. Therefore, p85α can function as a tumour suppressor and represent a new candidate for diagnosis, prognosis and targeted therapy.
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57
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Ye Y, Lin P, Zhang W, Tan S, Zhou X, Li R, Pu Q, Koff JL, Dhasarathy A, Ma F, Deng X, Jiang J, Wu M. DNA Repair Interacts with Autophagy To Regulate Inflammatory Responses to Pulmonary Hyperoxia. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2017; 198:2844-2853. [PMID: 28202616 PMCID: PMC5360514 DOI: 10.4049/jimmunol.1601001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 01/23/2017] [Indexed: 12/11/2022]
Abstract
Oxygen is supplied as a supportive treatment for patients suffering from acute respiratory distress syndrome. Unfortunately, high oxygen concentration increases reactive oxygen species generation, which causes DNA damage and ultimately cell death in the lung. Although 8-oxoguanine-DNA glycosylase (OGG-1) is involved in repairing hyperoxia-mediated DNA damage, the underlying molecular mechanism remains elusive. In this study, we report that ogg-1-deficient mice exhibited a significant increase of proinflammatory cytokines (TNF-α, IL-6, and IFN-γ) in the lung after being exposed to 95% oxygen. In addition, we found that ogg-1 deficiency downregulated (macro)autophagy when exposed to hyperoxia both in vitro and in vivo, which was evident by decreased conversion of LC3-I to LC3-II, reduced LC3 punctate staining, and lower Atg7 expression compared with controls. Using a chromatin immunoprecipitation assay, we found that OGG-1 associated with the promoter of Atg7, suggesting a role for OGG1 in regulation of Atg7 activity. Knocking down OGG-1 decreased the luciferase reporter activity of Atg7. Further, inflammatory cytokine levels in murine lung epithelial cell line cells were downregulated following autophagy induction by starvation and rapamycin treatment, and upregulated when autophagy was blocked using 3-methyladenine and chloroquine. atg7 knockout mice and Atg7 small interfering RNA-treated cells exhibited elevated levels of phospho-NF-κB and intensified inflammatory cytokines, suggesting that Atg7 impacts inflammatory responses to hyperoxia. These findings demonstrate that OGG-1 negatively regulates inflammatory cytokine release by coordinating molecular interaction with the autophagic pathway in hyperoxia-induced lung injury.
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Affiliation(s)
- Yan Ye
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Ping Lin
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, People's Republic of China
| | - Weidong Zhang
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Shirui Tan
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Xikun Zhou
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
- State Key Laboratory of Biotherapy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Rongpeng Li
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
- Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu 2211116, People's Republic of China
| | - Qinqin Pu
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Jonathan L Koff
- Department of Medicine, Yale University, New Haven, CT 06510
| | - Archana Dhasarathy
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203
| | - Feng Ma
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences and Peking Union Medical College, Chengdu 100005, People's Republic of China; and
| | - Xin Deng
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong 999077, People's Republic of China
| | - Jianxin Jiang
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, People's Republic of China;
| | - Min Wu
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58203;
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Qiu W, Zhang AL, Tian Y. Tetrandrine triggers an alternative autophagy in DU145 cells. Oncol Lett 2017; 13:3734-3738. [PMID: 28529589 DOI: 10.3892/ol.2017.5897] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 01/19/2017] [Indexed: 01/05/2023] Open
Abstract
Tetrandrine (Tet), a potent lysosomal inhibitor, blocks autophagic flux and induces cancer cell death. Previously, the present authors identified the prostate cancer cell line DU145 to exhibit high sensitivity towards Tet in 11 cancer cell lines. In the present study, autophagy in Tet-treated DU145 cells was investigated. Similar to other cell lines, such as PC-3 and 786-O cells, Tet neutralized the acidity of lysosome and blocked autophagy in DU145 cells. However, Tet failed to induce microtubule-associated protein 1 light chain 3 (LC3) conversion in DU145 cells. By contrast, it was observed by transmission electron microscopy that Tet induced an accumulation of autophagosomes in the cytoplasm. These contrasting results indicated that Tet triggered an LC3-independent autophagy in DU145 cells. Alkalizing lysosome with chloroquine enhanced Tet-induced cell death. The results of the present study indicated that detection of autophagy in tumor cells may assist in selecting lysosome inhibitors for chemotherapy treatment in prostate cancer.
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Affiliation(s)
- Wei Qiu
- Department of Urology, Beijing Friendship Hospital, Capital Medical University, Xicheng, Beijing 100050, P.R. China
| | - Ai-Li Zhang
- Department of Urology, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
| | - Ye Tian
- Department of Urology, Beijing Friendship Hospital, Capital Medical University, Xicheng, Beijing 100050, P.R. China
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Lien JC, Lin MW, Chang SJ, Lai KC, Huang AC, Yu FS, Chung JG. Tetrandrine induces programmed cell death in human oral cancer CAL 27 cells through the reactive oxygen species production and caspase-dependent pathways and associated with beclin-1-induced cell autophagy. ENVIRONMENTAL TOXICOLOGY 2017; 32:329-343. [PMID: 26822499 DOI: 10.1002/tox.22238] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 01/05/2016] [Accepted: 01/06/2016] [Indexed: 06/05/2023]
Abstract
Tetrandrine, a bisbenzylisoquinoline alkaloid, is extracted from the root of the Chinese herb Radix Stephania tetrandra S Moore. This compound has antitumor activity in different cancer cell types. In this study, the effects of tetrandrine on human oral cancer CAL 27 cells were examined. Results indicated that tetrandrine induced cytotoxic activity in CAL 27 cells. Effects were due to cell death by the induction of apoptosis and accompany with autophagy and these effects were concentration- and time-dependent manners. Tetrandrine induced apoptosis was accompanied by alterations in cell morphology, chromatin fragmentation, and caspase activation in CAL 27 cells. Tetrandrine treatment also induced intracellular accumulation of reactive oxygen species (ROS). The generation of ROS may play an important role in tetrandrine-induced apoptosis. Tetrandrine triggered LC3B expression and induced autophagy in CAL 27 cells. Tetrandrine induced apoptosis and autophagy were significantly attenuated by N-acetylcysteine pretreatment that supports the involvement of ROS production. Tetrandrine induced cell death may act through caspase-dependent apoptosis with Beclin-1-induced autophagy in human oral cancer cells. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 329-343, 2017.
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Affiliation(s)
- Jin-Cherng Lien
- Graduate Institute of Pharmaceutical Chemistry, China Medical University, Taichung, 404, Taiwan
| | - Meng-Wei Lin
- Department of Nursing, Cardinal Tien Junior College of Healthcare and Management, New Taipei, 231, Taiwan
| | - Shu-Jen Chang
- School of Pharmacy, China Medical University, Taichung, 404, Taiwan
| | - Kuang-Chi Lai
- Department of Surgery, China Medical University Beigang Hospital, Yunlin, 651, Taiwan
- School of Medicine, China Medical University Hospital, Taichung, 404, Taiwan
| | - An-Cheng Huang
- Department of Nursing, St. Mary's Medicine Nursing and Management College, Yilan, 266, Taiwan
| | - Fu-Shun Yu
- Department of Dentist, China Medical University, Taichung, 404, Taiwan
| | - Jing-Gung Chung
- Department of Biological Science and Technology, China Medical University, Taichung, 404, Taiwan
- Department of Biotechnology, Asia University, Taichung, 413, Taiwan
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60
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Zhang Z, Zhao S, Yao Z, Wang L, Shao J, Chen A, Zhang F, Zheng S. Autophagy regulates turnover of lipid droplets via ROS-dependent Rab25 activation in hepatic stellate cell. Redox Biol 2016; 11:322-334. [PMID: 28038427 PMCID: PMC5199192 DOI: 10.1016/j.redox.2016.12.021] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 12/19/2016] [Accepted: 12/19/2016] [Indexed: 12/22/2022] Open
Abstract
Activation of hepatic stellate cells (HSCs) is a pivotal event in liver fibrosis, characterized by dramatic disappearance of lipid droplets (LDs). Although LD disappearance has long been considered one of the hallmarks of HSC activation, the underlying molecular mechanisms are largely unknown. In this study, we sought to investigate the role of autophagy in the process of LD disappearance, and to further examine the underlying mechanisms in this molecular context. We found that LD disappearance during HSC activation was associated with a coordinate increase in autophagy. Inhibition or depletion of autophagy by Atg5 siRNA impaired LD disappearance of quiescent HSCs, and also restored lipocyte phenotype of activated HSCs. In contrast, induction of autophagy by Atg5 plasmid accelerated LD loss of quiescent HSCs. Importantly, our study also identified a crucial role for reactive oxygen species (ROS) in the facilitation of autophagy activation. Antioxidants, such as glutathione and N-acetyl cysteine, significantly abrogated ROS production, and in turn, prevented autophagosome generation and autophagic flux during HSC activation. Besides, we found that HSC activation triggered Rab25 overexpression, and promoted the combination of Rab25 and PI3KCIII, which direct autophagy to recognize, wrap and degrade LDs. Down-regulation of Rab25 activity, using Rab25 siRNA, blocked the target recognition of autophagy on LDs, and inhibited LD disappearance of quiescent HSCs. Moreover, the scavenging of excessive ROS could disrupt the interaction between autophagy and Rab25, and increase intracellular lipid content. Overall, these results provide novel implications to reveal the molecular mechanism of LD disappearance during HSC activation, and also identify ROS-Rab25-dependent autophagy as a potential target for the treatment of liver fibrosis. Autophagosome generation and autophagic flux are increased during HSC activation. The inhibition of autophagy blocks LD disappearance of quiescent HSCs. The induction of autophagy accelerates LD disappearance of quiescent HSCs. Rab25 activation is required for autophagy to degrade LDs during HSC activation. Mitochondrial H2O2 production triggers autophagy activation during HSC activation.
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Affiliation(s)
- Zili Zhang
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Shifeng Zhao
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Zhen Yao
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Ling Wang
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Jiangjuan Shao
- Department of Pharmacy, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Anping Chen
- Department of Pathology, School of Medicine, Saint Louis University, St Louis., MO 63104, USA
| | - Feng Zhang
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Shizhong Zheng
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China; Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, PR China.
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Zhang Z, Guo M, Zhao S, Shao J, Zheng S. ROS-JNK1/2-dependent activation of autophagy is required for the induction of anti-inflammatory effect of dihydroartemisinin in liver fibrosis. Free Radic Biol Med 2016; 101:272-283. [PMID: 27989749 DOI: 10.1016/j.freeradbiomed.2016.10.498] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 10/24/2016] [Accepted: 10/24/2016] [Indexed: 02/07/2023]
Abstract
Accumulating evidence identifies autophagy as an inflammation-related defensive mechanism against diseases including liver fibrosis. Therefore, autophagy may represent a new pharmacologic target for drug development to treat liver fibrosis. In this study, we sought to investigate the effect of dihydroartemisinin (DHA) on autophagy, and to further examine the molecular mechanisms of DHA-induced anti-inflammatory effects. We found that DHA appeared to play an essential role in controlling excessive inflammation. DHA suppressed inflammation in rat liver fibrosis model and inhibited the expression of proinflammatory cytokines in activated hepatic stellate cells (HSCs). Interestingly, DHA increased the autophagosome generation and autophagic flux in activated HSCs, which is underlying mechanism for the anti-inflammatory activity of DHA. Autophagy depletion impaired the induction of anti-inflammatory effect of DHA, while autophagy induction showed a synergistic effect with DHA. Importantly, our study also identified a crucial role for reactive oxygen species (ROS) in the facilitation of DHA-induced autophagy. Antioxidants, such as glutathione and N-acetyl cysteine, significantly abrogated ROS production, and in turn, prevented DHA-induced autophagosome generation and autophagic flux. Besides, we found that c-Jun N-terminal kinase1/2 (JNK1/2) was a downstream signaling molecule of ROS that mediated the induction of autophagy by DHA. Down-regulation of JNK1/2 activity, using selective JNK1/2 inhibitor (SP600125) or siJNK1/2, led to an inhibition of DHA-induced autophagy. Overall, these results provide novel implications to reveal the molecular mechanism of DHA-induced anti-inflammatory effects, by which points to the possibility of using DHA based proautophagic drugs for the treatment of inflammatory diseases.
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Affiliation(s)
- Zili Zhang
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Mei Guo
- Department of Pathogenic Biology and Immunology, Medical School, Southeast University, Nanjing 210009, PR China
| | - Shifeng Zhao
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Jiangjuan Shao
- Department of Pharmacy, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Shizhong Zheng
- Department of Pharmacology, College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China; Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, PR China.
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Inhibition of autophagy increased AGE/ROS-mediated apoptosis in mesangial cells. Cell Death Dis 2016; 7:e2445. [PMID: 27809300 PMCID: PMC5260901 DOI: 10.1038/cddis.2016.322] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 09/02/2016] [Accepted: 09/09/2016] [Indexed: 12/17/2022]
Abstract
The aim of our study was to investigate the role of autophagy, a homeostatic process involved in the lysosomal degradation of damaged cell organelles and proteins, in regulating the survival of mesangial cells treated with advanced glycation end products (AGEs). In the present study, AGEs induced mitochondrial depolarization and led to mitochondrial-dependent apoptosis in mesangial cells, as shown by the loss of the mitochondrial membrane potential; increased Bax processing; increased Caspase-9, Caspase-3 and PARP cleavage; and decreased Bcl-2 expression. Meanwhile, AGEs also triggered autophagy flux in mesangial cells, as confirmed by the presence of autophagic vesicles, the conversion of LC3II/LC3I and the increase/decrease in Beclin-1/p62 expression. Interestingly, this study reported apparent apoptosis and autophagy that were dependent on reactive oxygen species (ROS) production. Scavenging ROS with N-acetyl-l-cysteine could prevent the appearance of the autophagic features and reverse AGE-induced apoptosis. Moreover, AGE-triggered mitophagy, which was confirmed by the colocalization of autophagosomes and mitochondria and Parkin translocation to mitochondria, played a potential role in reducing ROS production in mesangial cells. Additionally, inhibition of autophagy significantly enhanced AGE-induced cell apoptosis. Taken together, our data suggest that ROS were the mediators of AGE-induced mesangial cell apoptosis and that autophagy was likely to be the mechanism that was triggered to repair the ROS-induced damage in the AGE-treated cells and thereby promote cell survival. This study provides new insights into the molecular mechanism of autophagy involved in AGE-induced apoptosis in mesangial cells.
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Wong VKW, Law BYK, Yao XJ, Chen X, Xu SW, Liu L, Leung ELH. Advanced research technology for discovery of new effective compounds from Chinese herbal medicine and their molecular targets. Pharmacol Res 2016; 111:546-555. [DOI: 10.1016/j.phrs.2016.07.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 07/19/2016] [Accepted: 07/19/2016] [Indexed: 02/07/2023]
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Ma K, Zhang C, Huang MY, Guo YX, Hu GQ. Crosstalk between Beclin-1-dependent autophagy and caspase‑dependent apoptosis induced by tanshinone IIA in human osteosarcoma MG-63 cells. Oncol Rep 2016; 36:1807-18. [PMID: 27499329 PMCID: PMC5022923 DOI: 10.3892/or.2016.5003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Accepted: 05/05/2016] [Indexed: 12/20/2022] Open
Abstract
The aim of the present study was to ascertain whether or not autophagy is induced by tanshinone IIA (TanIIA), and to explore the crosstalk between autophagy and apoptosis in regards to the antitumor effects of TanIIA on MG-63 cells and the potential mechanism. MG-63 cells were cultured in vitro with various concentrations of TanIIA (0, 2.5, 5, 10 and 20 mg/l) for 0, 24, 48 and 72 h, respectively. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide MTT assay was used to evaluate the inhibition of the proliferation of osteosarcoma MG-63 cells by TanIIA or in the presence/absence of chloroquine (CQ). Autophagic vacuoles and characteristic autophagosomes were observed by transmission electron microscopy (TEM). TanIIA-induced autophagy in MG-63 cells was confirmed by GFP-LC3 punctate fluorescence. The expression levels of apoptosis-related proteins caspase-3, caspase-8, caspase-9 and cleaved-PARP and autophagy-related proteins LC3II/LC3I and Beclin-1 were detected by western blotting. FITC-Annexin V/propidium iodide (PI) staining, flow cytometry and Hoechst 33258 staining were used to analyze the apoptotic rate. Fluorescence intensity of reactive oxygen species (ROS) was examined under a fluorescence microscope using an analysis software system. Cell proliferation was obviously inhibited by TanIIA in a dose- and time-dependent manner. Generation of autophagy was triggered by TanIIA (0–20 mg/l) treatment, and in a Beclin-1-dependent manner. Compared with the control group, the apoptosis ratio following treatment with 2.5 mg/l TanIIA failed to achieve statistical significance. Expression of caspase-3, -8 and -9, and cleaved-PARP in the other groups was gradually enhanced in dose-dependent manner. Our analysis also suggested that the influence of autophagy on TanIIA cytotoxicity had a phase effect; with low-dose drugs and shorter treatment periods, autophagy functioned as a damage repair mechanism. In conrast, when the cells were treated with higher doses of TanIIA for longer treatment periods, autophagic cell death contributed to apoptosis. Furthermore, generation of ROS occurred in a dose-dependent manner and pretreatment with NAC, a selective ROS scavenger, blocked the coexistence of Beclin-1 autophagy and caspase-dependent apoptosis. In conclusion, our findings provide strong evidence that TanIIA may be a potential therapeutic drug against osteosarcoma. Moreover, its cytotoxity can be enhanced with ROS agonists.
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Affiliation(s)
- Kun Ma
- Luoyang Orthopaedic-Traumatological Hospital and Henan Orthopaedic Hospital, Luoyang, Henan 471002, P.R. China
| | - Chuan Zhang
- Luoyang Orthopaedic-Traumatological Hospital and Henan Orthopaedic Hospital, Luoyang, Henan 471002, P.R. China
| | - Man-Yu Huang
- Luoyang Orthopaedic-Traumatological Hospital and Henan Orthopaedic Hospital, Luoyang, Henan 471002, P.R. China
| | - Yan-Xing Guo
- Luoyang Orthopaedic-Traumatological Hospital and Henan Orthopaedic Hospital, Luoyang, Henan 471002, P.R. China
| | - Guo-Qiang Hu
- College of Pharmacy, Henan University, Kaifeng, Henan 475000, P.R. China
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Chen H, Wang J, Liu Z, Yang H, Zhu Y, Zhao M, Liu Y, Yan M. Mitochondrial DNA depletion causes decreased ROS production and resistance to apoptosis. Int J Mol Med 2016; 38:1039-46. [PMID: 27499009 PMCID: PMC5029958 DOI: 10.3892/ijmm.2016.2697] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 06/14/2016] [Indexed: 11/06/2022] Open
Abstract
Mitochondrial DNA (mtDNA) depletion occurs frequently in many diseases including cancer. The present study was designed in order to examine the hypothesis that mtDNA‑depleted cells are resistant to apoptosis and to explore the possible mechanisms responsible for this effect. Parental human osteosarcoma 143B cells and mtDNA‑deficient (Rho˚ or ρ˚) 206 cells (derived from 143B cells) were exposed to different doses of solar-simulated ultraviolet (UV) radiation. The effects of solar irradiation on cell morphology were observed under both light and fluorescence microscopes. Furthermore, apoptosis, mitochondrial membrane potential (MMP) disruption and reactive oxygen species (ROS) production were detected and measured by flow cytometry. In both cell lines, apoptosis and ROS production were clearly increased, whereas MMP was slightly decreased. However, apoptosis and ROS production were reduced in the Rho˚206 cells compared with the 143B cells. We also performed western blot analysis and demonstrated the increased release of cytosolic Cyt c from mitochondria in the 143B cells compared with that in the Rho˚206 cells. Thus, we concluded that Rho˚206 cells exhibit more resistance to solar‑simulated UV radiation‑induced apoptosis at certain doses than 143B cells and this is possibly due to decreased ROS production.
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Affiliation(s)
- Hulin Chen
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command (Liuhuaqiao Hospital), Guangzhou, Guangdong 510010, P.R. China
| | - Junling Wang
- Gynecologic Department of Guangzhou Hospital of Integrated Traditional and West Medicine, Guangzhou, Guangdong 510800, P.R. China
| | - Zhongrong Liu
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command (Liuhuaqiao Hospital), Guangzhou, Guangdong 510010, P.R. China
| | - Huilan Yang
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command (Liuhuaqiao Hospital), Guangzhou, Guangdong 510010, P.R. China
| | - Yingjie Zhu
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command (Liuhuaqiao Hospital), Guangzhou, Guangdong 510010, P.R. China
| | - Minling Zhao
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command (Liuhuaqiao Hospital), Guangzhou, Guangdong 510010, P.R. China
| | - Yan Liu
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command (Liuhuaqiao Hospital), Guangzhou, Guangdong 510010, P.R. China
| | - Miaomiao Yan
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command (Liuhuaqiao Hospital), Guangzhou, Guangdong 510010, P.R. China
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Yan M, Liu Z, Yang H, Li C, Chen H, Liu Y, Zhao M, Zhu Y. Luteolin decreases the UVA‑induced autophagy of human skin fibroblasts by scavenging ROS. Mol Med Rep 2016; 14:1986-92. [PMID: 27430964 PMCID: PMC4991762 DOI: 10.3892/mmr.2016.5517] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 04/22/2016] [Indexed: 11/06/2022] Open
Abstract
Luteolin (LUT) is a flavone, which is universally present as a constituent of traditional Chinese herbs, and certain vegetables and spices, and has been demonstrated to exhibit potent radical scavenging and cytoprotective properties. Although LUT has various beneficial effects on health, the effects of LUT on the protection of skin remain to be fully elucidated. The present study investigated whether LUT can protect human skin fibroblasts (HSFs) from ultraviolet (UV) A irradiation. It was found that, following exposure to different doses of UVA irradiation, the HSFs exhibited autophagy, as observed by fluorescence and transmission electron microscopy, and reactive oxygen species (ROS) bursts, analyzed by flow cytometry, to differing degrees. Following incubation with micromolar concentrations of LUT, ROS production decreased and autophagy gradually declined. In addition, the expression of hypoxia-inducible factor-1α and the classical autophagy-associated proteins, LC3 and Beclin 1 were observed by western blotting. Western blot analysis showed that the expression levels of HIF-1α, LC3-II and Beclin 1 gradually decreased in the UVA-irradiated HSFs following treatment with LUT. These data indicated that UVA-induced autophagy was mediated by ROS, suggesting the possibility of resistance against UV by certain natural antioxidants, including LUT.
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Affiliation(s)
- Miaomiao Yan
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
| | - Zhongrong Liu
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
| | - Huilan Yang
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
| | - Cuihua Li
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
| | - Hulin Chen
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
| | - Yan Liu
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
| | - Minling Zhao
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
| | - Yingjie Zhu
- Department of Dermatology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, Guangdong 510010, P.R. China
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Tetrandrine induces lipid accumulation through blockade of autophagy in a hepatic stellate cell line. Biochem Biophys Res Commun 2016; 477:40-46. [PMID: 27270032 DOI: 10.1016/j.bbrc.2016.06.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 06/03/2016] [Indexed: 02/07/2023]
Abstract
Macroautophagy, or autophagy, is a cellular response in which unnecessary cytoplasmic components, including lipids and organelles, are self-degraded. Recent studies closely related autophagy to activation of hepatic stellate cells (HSCs), a process critical in the pathogenesis of liver fibrosis. During HSC activation, cytoplasmic lipid droplets (LDs) are degraded as autophagic cargo, and then cells express fibrogenic genes. Thus, inhibition of autophagy in HSCs is a potential therapeutic approach for attenuating liver fibrosis. We found that tetrandrine, a bisbenzylisoquinoline alkaloid isolated from Stephania tetrandra, induced lipid accumulation, a phenotype associated with quiescent HSCs, through blockade of autophagy in the rat-derived HSC line HSC-T6. Tetrandrine inhibited autophagic flux without affecting lysosomal function. A phenotypic comparison using siRNA knockdown suggested that tetrandrine may target regulators, involved in fusion between autophagosomes and lysosomes (e.g., syntaxin 17). Moreover, perilipin 1, an LD-coated protein, co-localized specifically with LC3, a marker protein for autophagosomes, in tetrandrine-treated HSC-T6 cells. This suggests a potential role for perilipin 1 in autophagy-mediated LD degradation in HSCs. Our results identified tetrandrine as a potential tool for prevention and treatment of HSC activation.
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68
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Wang XD, Li CY, Jiang MM, Li D, Wen P, Song X, Chen JD, Guo LX, Hu XP, Li GQ, Zhang J, Wang CH, He ZD. Induction of apoptosis in human leukemia cells through an intrinsic pathway by cathachunine, a unique alkaloid isolated from Catharanthus roseus. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2016; 23:641-653. [PMID: 27161405 DOI: 10.1016/j.phymed.2016.03.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 03/01/2016] [Accepted: 03/04/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND Catharanthus roseus (L.) G. Don consists of a range of dimeric indole alkaloids with significant antitumor activities. These alkaloids have been found to possess apoptosis-inducing activity against tumor cells in vitro and in vivo mediated by nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) and c-Jun N-terminal kinase (JNK) pathways, in which DNA damage and mitochondrial dysfunction play important roles. In this study, a unique bisindole alkaloid named cathachunine, along with five known dimeric indole alkaloids, was obtained from C. roseus and investigated in vitro. PURPOSE The aim of this study was to investigate the antitumor activity of isolated alkaloids and the mechanism through which cathachunine exerts its antitumor effect. STUDY DESIGN AND METHODS Cell growth inhibition was assessed by WST-1 and lactate dehydrogenase (LDH) assays in HL60, K562 leukemia cells and EA.hy926 umbilical vein cells. Induction of apoptosis in HL60 cells was confirmed by observation of nuclear morphology, a caspase-3 activity assay and annexin V-fluorescein isothiocyanate/propidium iodide (FITC/PI) double staining. The intrinsic apoptotic pathway induced by cathachunine was evidenced by B-cell lymphoma 2/Bcl-2-associated X protein (Bcl-2/Bax) dysregulation, loss of mitochondrial membrane potential, translocation of cytochrome c, and cleavage of caspase-3 and poly-ADP ribose polymerase (PARP). Reactive oxygen species (ROS) production after cathachunine treatment was determined by 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) staining. Cell cycle arrest of the S phase was also observed in HL60 cells after cathachunine treatment. RESULTS The WST-1 and LDH assays showed that Catharanthus alkaloids were cytotoxic toward human leukemia cells to a greater extent than toward normal human endothelial cells, and the anti-proliferation and pro-apoptosis abilities of cathachunine were much more potent than other previously reported alkaloids. The induction of apoptosis by cathachunine occurred through an ROS-dependent mitochondria-mediated intrinsic pathway rather than an extrinsic pathway, and was regulated by the Bcl-2 protein family. CONCLUSION An unprecedented bisindole alkaloid cathachunine which lost C-18' and C-19' was isolated from C. roseus. It exerted a potent antitumor effect toward human leukemia cells through the induction of apoptosis via an intrinsic pathway. Thus, this study provides evidence for a new lead compound from a natural source for anti-cancer investigations.
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Affiliation(s)
- Xiao-Dong Wang
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Institute of Biotherapy, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Engineering Laboratory of Shenzhen Natural Micromolecule Innovative Drugs, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Chen-Yang Li
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Institute of Biotherapy, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Engineering Laboratory of Shenzhen Natural Micromolecule Innovative Drugs, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Miao-Miao Jiang
- Tianjin Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Dong Li
- Tianjin Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Ping Wen
- Business Technology Department, Shenzhen Institute for Drug Control, Shenzhen 518057, Guangdong, PR China
| | - Xun Song
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Institute of Biotherapy, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Engineering Laboratory of Shenzhen Natural Micromolecule Innovative Drugs, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Jun-Da Chen
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Li-Xuan Guo
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Xiao-Peng Hu
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Institute of Biotherapy, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Engineering Laboratory of Shenzhen Natural Micromolecule Innovative Drugs, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Guo-Qiang Li
- Experiment and Technology Center, Jinan University, Guangzhou 510632, Guangdong, PR China
| | - Jian Zhang
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Institute of Biotherapy, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Engineering Laboratory of Shenzhen Natural Micromolecule Innovative Drugs, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Chun-Hua Wang
- Tianjin Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China.
| | - Zhen-Dan He
- Department of Pharmacy, School of Medicine, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Institute of Biotherapy, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Engineering Laboratory of Shenzhen Natural Micromolecule Innovative Drugs, Shenzhen University, Shenzhen 518060, Guangdong, PR China.
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Liu T, Men Q, Wu G, Yu C, Huang Z, Liu X, Li W. Tetrandrine induces autophagy and differentiation by activating ROS and Notch1 signaling in leukemia cells. Oncotarget 2016; 6:7992-8006. [PMID: 25797266 PMCID: PMC4480730 DOI: 10.18632/oncotarget.3505] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Accepted: 02/01/2015] [Indexed: 12/19/2022] Open
Abstract
All-trans retinoic acid (ATRA) is a differentiating agent for the treatment of acute promyelocytic leukemia (APL). However, the therapeutic efficacy of ATRA has limitations. Tetrandrine is a traditional Chinese medicinal herb extract with antitumor effects. In this study, we investigated the effects of tetrandrine on human PML-RARα-positive acute promyelocytic leukemia cells. Tetrandrine inhibited tumors in vivo. It induced autophagy and differentiation by triggering ROS generation and activating Notch1 signaling. Tetrandrine induced autophagy and differentiation in M5 type patient primary leukemia cells. The in vivo results indicated that low concentrations of tetrandrine inhibited leukemia cells proliferation and induced autophagy and then facilitated their differentiation, by activating ROS and Notch1 signaling. We suggest that tetrandrine is a potential agent for the treatment of APL by inducing differentiation of leukemia cells.
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Affiliation(s)
- Ting Liu
- College of Life Sciences, Wuhan University, Wuhan, P. R. China
| | - Qiuxu Men
- Ministry of Education Laboratory of Combinatorial Biosynthesis and Drug Discovery, College of Pharmacy, Wuhan University, Wuhan, P. R. China
| | - Guixian Wu
- College of Life Sciences, Wuhan University, Wuhan, P. R. China
| | - Chunrong Yu
- College of Life Sciences, Wuhan University, Wuhan, P. R. China
| | - Zan Huang
- College of Life Sciences, Wuhan University, Wuhan, P. R. China
| | - Xin Liu
- Ministry of Education Laboratory of Combinatorial Biosynthesis and Drug Discovery, College of Pharmacy, Wuhan University, Wuhan, P. R. China
| | - Wenhua Li
- College of Life Sciences, Wuhan University, Wuhan, P. R. China
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Yu FS, Yu CS, Chen JC, Yang JL, Lu HF, Chang SJ, Lin MW, Chung JG. Tetrandrine induces apoptosis Via caspase-8, -9, and -3 and poly (ADP ribose) polymerase dependent pathways and autophagy through beclin-1/ LC3-I, II signaling pathways in human oral cancer HSC-3 cells. ENVIRONMENTAL TOXICOLOGY 2016; 31:395-406. [PMID: 25266202 DOI: 10.1002/tox.22053] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 09/05/2014] [Accepted: 09/10/2014] [Indexed: 06/03/2023]
Abstract
Tetrandrine is a bisbenzylisoquinoline alkaloid that was found in the Radix Stephania tetrandra S Moore. It had been reported to induce cytotoxic effects on many human cancer cells. In this study, we investigated the cytotoxic effects of tetrandrine on human oral cancer HSC-3 cells in vitro. Treatments of HSC-3 cells with tetrandrine significantly decreased the percentage of viable cells through the induction of autophagy and apoptosis and these effects are in concentration-dependent manner. To define the mechanism underlying the cytotoxic effects of tetrandrine, we investigated the critical molecular events known to regulate the apoptotic and autophagic machinery. Tetrandrine induced chromatin condensation, internucleosomal DNA fragmentation, activation of caspases-3, -8, and -9, and cleavage of poly (ADP ribose) polymerase (PARP) that were associated with apoptosis, and it also enhanced the expression of LC3-I and -II that were associated with the induction of autophagy in human squamous carcinoma cell line (HSC-3) cells. Tetrandrine induced autophagy in HSC-3 cells was significantly attenuated by bafilomycin A1 (inhibitor of autophagy) pre-treatment that confirmed tetrandrine induced cell death may be associated with the autophagy. In conclusion, we suggest that tetrandrine induced cell death may be through the induction of apoptosis as well as autophagy in human oral cancer HSC-3 cells via PARP, caspases/Becline I/LC3-I/II signaling pathways.
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Affiliation(s)
- Fu-Shun Yu
- Department of Dentist, China Medical University, Taichung, 404, Taiwan
| | - Chun-Shu Yu
- School of Pharmacy, China Medical University, Taichung, 404, Taiwan
| | - Jaw-Chyun Chen
- Department of Medicinal Botany and Health Applications, Da-Yeh University, Changhua, Taiwan
| | - Jiun-Long Yang
- Department of Chinese Medicine Resources, China Medical University, Taichung, 404, Taiwan
| | - Hsu-Feng Lu
- Clinical Pathology, Cheng Hsin General Hospital, Taipei, Taiwan
- School of Chinese Medicine, China Medical University, Taichung 404, Taiwan
| | - Shu-Jen Chang
- School of Pharmacy, China Medical University, Taichung, 404, Taiwan
| | - Meng-Wei Lin
- Department of Nursing, Cardinal Tien Junior College of Healthcare and Management, Yilan, Taiwan
| | - Jing-Gung Chung
- Department of Biological Science and Technology, China Medical University, Taichung, 404, Taiwan
- Department of Biotechnology, Asia University, Taichung, 413, Taiwan
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Lin CH, Chang CY, Lee KR, Lin HJ, Lin WC, Chen TH, Wan L. Cold-water extracts of Grifola frondosa and its purified active fraction inhibit hepatocellular carcinoma in vitro and in vivo. Exp Biol Med (Maywood) 2016; 241:1374-85. [PMID: 27013543 DOI: 10.1177/1535370216640149] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 02/18/2016] [Indexed: 12/22/2022] Open
Abstract
Mushrooms are used in traditional Chinese medicine to treat a variety of diseases. Grifola frondosa (GF) is an edible mushroom indigenous to many Asian countries with a large fruiting body characterized by overlapping caps. In particular, GF is known for its anti-tumor activity, which has been targeted by scientific and clinical research. This study aimed to investigate the effects of the cold-water extract of GF (GFW) and its active fraction (GFW-GF) on autophagy and apoptosis, and the underlying mechanisms in vitro and in vivo Our results revealed that GFW and GFW-GF inhibited phosphatidylinositol 3-kinase (PI3K) and stimulated c-Jun N-terminal kinase (JNK) pathways, thereby inducing autophagy. We also demonstrated that GFW and GFW-GF inhibited proliferation, induced cell cycle arrest, and apoptosis in Hep3B hepatoma cells. GFW and GFW-GF markedly arrested cells in S phase and promoted cleavage of caspase-3 and -9. In addition, GFW and GFW-GF decreased the expression levels of the anti-apoptotic proteins protein kinase B and extracellular signal-regulated kinase. We also found that GFW significantly inhibited tumor growth in nude mice implanted with Hep3B cells. Our work demonstrates that GF and its active fraction inhibit hepatoma growth by inducing autophagy and apoptosis.
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Affiliation(s)
- Chia-Hung Lin
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ching-Yao Chang
- Department of Biotechnology, Asia University, Taichung 41354, Taiwan
| | - Kuan-Rong Lee
- Institute of Molecular Medicine, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Hui-Ju Lin
- Department of Ophthalmology, China Medical University Hospital, Taichung 40402, Taiwan School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan
| | - Wu-Chou Lin
- School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan Department of Gynecology, China Medical University Hospital, Taichung 40402, Taiwan
| | - Ter-Hsin Chen
- Graduate Institute of Veterinary Pathobiology, College of Veterinary Medicine, National Chung Hsing University, Taichung 40227, Taiwan
| | - Lei Wan
- Department of Biotechnology, Asia University, Taichung 41354, Taiwan School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan Department of Gynecology, China Medical University Hospital, Taichung 40402, Taiwan
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72
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Unravelling the relationship between macroautophagy and mitochondrial ROS in cancer therapy. Apoptosis 2016; 21:517-31. [DOI: 10.1007/s10495-016-1236-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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73
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Chen P, Hu T, Liang Y, Jiang Y, Pan Y, Li C, Zhang P, Wei D, Li P, Jeong LS, Chu Y, Qi H, Yang M, Hoffman RM, Dong Z, Jia L. Synergistic inhibition of autophagy and neddylation pathways as a novel therapeutic approach for targeting liver cancer. Oncotarget 2016; 6:9002-17. [PMID: 25797246 PMCID: PMC4496198 DOI: 10.18632/oncotarget.3282] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 02/05/2015] [Indexed: 01/14/2023] Open
Abstract
Liver cancer is the second-most frequent cause of cancer death in the world and is highly treatment resistant. We reported previously that inhibition of neddylation pathway with specific NAE inhibitor MLN4924, suppressed the malignant phenotypes of liver cancer. However, during the process, MLN4924 induces pro-survival autophagy as a mechanism of drug resistance. Here, we report that blockage of autophagy with clinically-available autophagy inhibitors (e.g. chloroquine) significantly enhanced the efficacy of MLN4924 on liver cancer cells by triggering apoptosis. Mechanistically, chloroquine enhanced MLN4924-induced up-regulation of pro-apoptotic proteins (e.g. NOXA) and down-regulation of anti-apoptotic proteins. Importantly, the down-regulation of NOXA expression via siRNA silencing substantially attenuated apoptosis of liver cancer cells. Further mechanistic studies revealed that blockage of autophagy augmented MLN4924-induced DNA damage and reactive oxygen species (ROS) generation. The elimination of DNA damage or blockage of ROS production significantly reduced the expression of NOXA, and thereby attenuated apoptosis and reduced growth inhibition of liver cancer cells. Moreover, blockage of autophagy enhanced the efficacy of MLN4924 in an orthotopic model of human liver cancer, with induction of NOXA and apoptosis in tumor tissues. These findings provide important preclinical evidence for clinical investigation of synergistic inhibition of neddylation and autophagy in liver cancer.
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Affiliation(s)
- Ping Chen
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.,College of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China.,Department of Immunology, Shanghai Medical College, Fudan University, Shanghai, China.,Collaborative Innovation Center of Henan Province for Cancer Chemoprevention, Zhengzhou, China
| | - Tao Hu
- College of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China.,Collaborative Innovation Center of Henan Province for Cancer Chemoprevention, Zhengzhou, China
| | - Yupei Liang
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yanan Jiang
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.,Department of Immunology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yongfu Pan
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.,Department of Immunology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Chunjie Li
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.,Department of Immunology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Ping Zhang
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Dongping Wei
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Pei Li
- College of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China.,Collaborative Innovation Center of Henan Province for Cancer Chemoprevention, Zhengzhou, China
| | - Lak Shin Jeong
- College of Pharmacy, Seoul National University, Seoul, Korea
| | - Yiwei Chu
- Department of Immunology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Hui Qi
- AntiCancer Biotech Beijing Co. Ltd., Beijing, China.,Anticancer, Inc., San Diego, CA, USA
| | - Meng Yang
- AntiCancer Biotech Beijing Co. Ltd., Beijing, China.,Anticancer, Inc., San Diego, CA, USA
| | - Robert M Hoffman
- Department of Surgery, University of California, San Diego, CA, USA.,Anticancer, Inc., San Diego, CA, USA
| | - Ziming Dong
- College of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China.,Collaborative Innovation Center of Henan Province for Cancer Chemoprevention, Zhengzhou, China
| | - Lijun Jia
- Cancer Institute, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
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Li H, Jiang W, Liu Y, Jiang J, Zhang Y, Wu P, Zhao J, Duan X, Zhou X, Feng L. The metabolites of glutamine prevent hydroxyl radical-induced apoptosis through inhibiting mitochondria and calcium ion involved pathways in fish erythrocytes. Free Radic Biol Med 2016; 92:126-140. [PMID: 26795598 DOI: 10.1016/j.freeradbiomed.2016.01.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 01/12/2016] [Accepted: 01/12/2016] [Indexed: 12/12/2022]
Abstract
The present study explored the apoptosis pathways in hydroxyl radicals ((∙)OH)-induced carp erythrocytes. Carp erythrocytes were treated with the caspase inhibitors in physiological carp saline (PCS) or Ca(2+)-free PCS in the presence of 40μM FeSO4/20μM H2O2. The results showed that the generation of reactive oxygen species (ROS), the release of cytochrome c and DNA fragmentation were caspase-dependent, and Ca(2+) was involved in calpain activation and phosphatidylserine (PS) exposure in (∙)OH-induced carp erythrocytes. Moreover, the results suggested that caspases were involved in PS exposure, and Ca(2+) was involved in DNA fragmentation in (∙)OH-induced fish erythrocytes. These results demonstrated that there might be two apoptosis pathways in fish erythrocytes, one is the caspase and cytochrome c-dependent apoptosis that is similar to that in mammal nucleated cells, the other is the Ca(2+)-involved apoptosis that was similar to that in mammal non-nucleated erythrocytes. So, fish erythrocytes may be used as a model for studying oxidative stress and apoptosis in mammal cells. Furthermore, the present study investigated the effects of glutamine (Gln)'s metabolites [alanine (Ala), citrulline (Cit), proline (Pro) and their combination (Ala10Pro4Cit1)] on the pathways of apoptosis in fish erythrocytes. The results displayed that Ala, Cit, Pro and Ala10Pro4Cit1 effectively suppressed ROS generation, cytochrome c release, activation of caspase-3, caspase-8 and caspase-9 at the physiological concentrations, prevented Ca(2+) influx, calpain activation, PS exposure, DNA fragmentation and the degradation of the cytoskeleton and oxidation of membrane and hemoglobin (Hb) and increased activity of anti-hydroxyl radical (AHR) in (∙)OH-induced carp erythrocytes. Ala10Pro4Cit1 produced a synergistic effect of inhibited oxidative stress and apoptosis in fish erythrocytes. These results demonstrated that Ala, Cit, Pro and their combination can protect mammal erythrocytes and nucleated cells against oxidative stress and apoptosis. The studies supported the use of Gln, Ala, Cit and Pro as oxidative stress and apoptosis inhibitors in mammal cells and the hypothesis that the inhibited effects of Gln on oxidative stress and apoptosis are at least partly dependent on that of its metabolites in mammalian.
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Affiliation(s)
- Huatao Li
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Conservation and Utilization of Fishes Resources in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province, Neijiang Normal University, Sichuan, Neijiang 641000, China
| | - Weidan Jiang
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China
| | - Yang Liu
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China
| | - Jun Jiang
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China
| | - Yongan Zhang
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Pei Wu
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China
| | - Juan Zhao
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China
| | - Xudong Duan
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China
| | - Xiaoqiu Zhou
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China.
| | - Lin Feng
- Animal Nutrition Institute, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Sichuan, Chengdu 611130, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Sichuan, Chengdu 611130, China.
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75
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Li H, Jiang W, Liu Y, Jiang J, Zhang Y, Wu P, Zhao J, Duan X, Zhou X, Feng L. Data in the activities of caspases and the levels of reactive oxygen species and cytochrome c in the •OH-induced fish erythrocytes treated with alanine, citrulline, proline and their combination. Data Brief 2016; 7:16-22. [PMID: 26952131 PMCID: PMC4761654 DOI: 10.1016/j.dib.2016.02.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 02/01/2016] [Indexed: 11/26/2022] Open
Abstract
The present study explored the effects of alanine (Ala), citrulline (Cit), proline (Pro) and their combination (Ala10Pro4Cit1) on the activities of caspases and levels of reactive oxygen species (ROS) and cytochrome c in hydroxyl radicals (•OH)-induced carp erythrocytes. The data displayed that •OH induced the increases in the activities of caspase-3, caspase-8 and caspase-9 and the levels of ROS and cytochrome c in carp erythrocytes. However, Ala, Cit, Pro and Ala10Pro4Cit1 effectively suppressed the •OH-induced increases in the activities of caspase-3, caspase-8 and caspase-9 and the levels of ROS and cytochrome c in carp erythrocytes. Furthermore, the activities of caspase-3, caspase-8 and caspase-9 and the levels of ROS and cytochrome c were gradually decreased with increasing concentrations of Ala, Cit, Pro and Ala10Pro4Cit1 (0.175-1.400 mM) in the •OH-induced carp erythrocytes. These data demonstrated that the 50% inhibitory doses (ID50) of Ala10Pro4Cit1 on the activities of caspase-8, caspase-9 and caspase-3 and levels of ROS and cytochrome c were respectively estimated to be the minimum values among amino acids examined so far. The 5% inhibitory doses (ID5) of Ala, Cit, Pro and Ala10Pro4Cit1 on the activities of caspase-8, caspase-9 and caspase-3 and levels of ROS and cytochrome c were estimated to be at their physiological concentrations in mammalian. Our research article for further interpretation and discussion from these data in Li et al. (2016) [1].
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Affiliation(s)
- Huatao Li
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Conservation and Utilization of Fishes resources in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province, Neijiang Normal University, Neijiang 641000, Sichuan, China
| | - Weidan Jiang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Yang Liu
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Jun Jiang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Yongan Zhang
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, Hubei, China
| | - Pei Wu
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Juan Zhao
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Xudong Duan
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Xiaoqiu Zhou
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Lin Feng
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu 611130, Sichuan, China; Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
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Xiao Y, Liu H, Yu J, Zhao Z, Xiao F, Xia T, Wang C, Li K, Deng J, Guo Y, Chen S, Chen Y, Guo F. Activation of ERK1/2 Ameliorates Liver Steatosis in Leptin Receptor-Deficient (db/db) Mice via Stimulating ATG7-Dependent Autophagy. Diabetes 2016; 65:393-405. [PMID: 26581593 DOI: 10.2337/db15-1024] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 11/11/2015] [Indexed: 11/13/2022]
Abstract
Although numerous functions of extracellular signal-regulated kinase 1/2 (ERK1/2) are identified, a direct effect of ERK1/2 on liver steatosis has not been reported. Here, we show that ERK1/2 activity is compromised in livers of leptin receptor-deficient (db/db) mice. Adenovirus-mediated activation of mitogen-activated protein kinase kinase 1 (MEK1), the upstream regulator of ERK1/2, significantly ameliorated liver steatosis in db/db mice, increased expression of genes related to fatty acid β-oxidation and triglyceride (TG) export and increased serum β-hydroxybutyrate (3-HB) levels. Opposite effects were observed in adenovirus-mediated ERK1/2 knockdown C57/B6J wild-type mice. Furthermore, autophagy and autophagy-related protein 7 (ATG7) expression were decreased or increased by ERK1/2 knockdown or activation, respectively, in primary hepatocytes and liver. Blockade of autophagy by the autophagy inhibitor chloroquine or adenovirus-mediated ATG7 knockdown reversed the ameliorated liver steatosis in recombinant adenoviruses construct expressing rat constitutively active MEK1 Ad-CA MEK1 db/db mice, decreased expression of genes related to fatty acid β-oxidation and TG export, and decreased serum 3-HB levels. Finally, ERK1/2 regulated ATG7 expression in a p38-dependent pathway. Taken together, these results identify a novel beneficial role for ERK1/2 in liver steatosis via promoting ATG7-dependent autophagy, which provides new insights into the mechanisms underlying liver steatosis and important hints for targeting ERK1/2 in treating liver steatosis.
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Affiliation(s)
- Yuzhong Xiao
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Hao Liu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Junjie Yu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Zilong Zhao
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Fei Xiao
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Tingting Xia
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Chunxia Wang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Kai Li
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Jiali Deng
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Yajie Guo
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Shanghai Chen
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Yan Chen
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
| | - Feifan Guo
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institute for Biological Sciences, Graduate School of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Shanghai, China
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77
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Hu B, An HM, Wang SS, Chen JJ, Xu L. Preventive and Therapeutic Effects of Chinese Herbal Compounds against Hepatocellular Carcinoma. Molecules 2016; 21:142. [PMID: 26828466 PMCID: PMC6274246 DOI: 10.3390/molecules21020142] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 01/13/2016] [Accepted: 01/20/2016] [Indexed: 12/14/2022] Open
Abstract
Traditional Chinese Medicines, unique biomedical and pharmaceutical resources, have been widely used for hepatocellular carcinoma (HCC) prevention and treatment. Accumulated Chinese herb-derived compounds with significant anti-cancer effects against HCC have been identified. Chinese herbal compounds are effective in preventing carcinogenesis, inhibiting cell proliferation, arresting cell cycle, inducing apoptosis, autophagy, cell senescence and anoikis, inhibiting epithelial-mesenchymal transition, metastasis and angiogenesis, regulating immune function, reversing drug resistance and enhancing the effects of chemotherapy in HCC. This paper comprehensively reviews these compounds and their effects on HCC. Finally, the perspectives and rational application of herbal compounds for HCC management are discussed.
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Affiliation(s)
- Bing Hu
- Department of Oncology and Institute of Traditional Chinese Medicine in Oncology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China.
| | - Hong-Mei An
- Department of Science & Technology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 202032, China.
| | - Shuang-Shuang Wang
- Department of Oncology and Institute of Traditional Chinese Medicine in Oncology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China.
| | - Jin-Jun Chen
- Department of Plastic & Reconstructive Surgery, Shanghai Key Laboratory of Tissue Engineering, The Ninth People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200011, China.
| | - Ling Xu
- Department of Oncology and Institute of Traditional Chinese Medicine in Oncology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China.
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78
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Pallichankandy S, Rahman A, Thayyullathil F, Galadari S. ROS-dependent activation of autophagy is a critical mechanism for the induction of anti-glioma effect of sanguinarine. Free Radic Biol Med 2015; 89:708-20. [PMID: 26472194 DOI: 10.1016/j.freeradbiomed.2015.10.404] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 09/19/2015] [Accepted: 10/08/2015] [Indexed: 01/22/2023]
Abstract
Malignant gliomas are notoriously resistant to therapies that induce apoptosis, but are less resistant to therapies that induce autophagy. Therefore, drugs targeting autophagy are promising candidates in the treatment of malignant gliomas. In this study, we investigated the anti-glioma potential of sanguinarine (SNG) in vitro, and further examined the molecular mechanisms of SNG-induced cell death. In human malignant glioma cells SNG activated autophagic cell death pathway characterized by increased acidic vesicular organelles formation, GFP-LC3 punctate formation, LC3-II conversion, and expression of autophagy related proteins, such as Atg5 and Beclin-1. The autophagy inhibitor bafilomycin A1 or knockdown of Atg5 markedly inhibited the SNG-induced autophagic cell death. Apart from inducing autophagic cell death, SNG has also been shown to induce apoptotic cell death in these cell lines. Importantly, the study also identified the crucial role of reactive oxygen species (ROS)-dependent activation of the extracellular signal-regulated kinase1/2 (ERK1/2) in the facilitation of SNG-induced autophagic cell death. Antioxidants, such as glutathione and N-acetyl cysteine, significantly abrogated ROS production, ERK1/2 activation, and in turn, prevented SNG-induced autophagic cell death. Moreover, scavengers of H2O2 (sodium pyruvate and catalase) significantly attenuated the activity of SNG. Down-regulation of ERK1/2 activity, by using selective ERK1/2 inhibitor (U0126) or siERK1/2, led to an inhibition of SNG-induced autophagic cell death. Furthermore, tumor cells transfected with constitutively active ERK2-MEK1-LA fusion protein accentuated SNG-induced autophagic cell death. Overall, our findings unveil a novel anti-tumor mechanism of action of SNG in human malignant glioma cells, opening up the possibility of using SNG based pro-autophagic drugs for the treatment of malignant glioma.
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Affiliation(s)
- Siraj Pallichankandy
- Cell Signaling Laboratory, Department of Biochemistry, College of Medicine and Health Sciences, UAE University, P.O. Box 17666, Al Ain, Abu Dhabi, UAE.
| | - Anees Rahman
- Cell Signaling Laboratory, Department of Biochemistry, College of Medicine and Health Sciences, UAE University, P.O. Box 17666, Al Ain, Abu Dhabi, UAE.
| | - Faisal Thayyullathil
- Cell Signaling Laboratory, Department of Biochemistry, College of Medicine and Health Sciences, UAE University, P.O. Box 17666, Al Ain, Abu Dhabi, UAE.
| | - Sehamuddin Galadari
- Cell Signaling Laboratory, Department of Biochemistry, College of Medicine and Health Sciences, UAE University, P.O. Box 17666, Al Ain, Abu Dhabi, UAE; Al Jalila Foundation Research Centre, P.O. Box 300100, Dubai, UAE.
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79
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HORNG CHITING, YANG JAISING, CHIANG JOHUA, LU CHICHENG, LEE CHIUFANG, CHIANG NINA, CHEN FUAN. Inhibitory effects of tetrandrine on epidermal growth factor-induced invasion and migration in HT29 human colorectal adenocarcinoma cells. Mol Med Rep 2015; 13:1003-9. [DOI: 10.3892/mmr.2015.4635] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 10/19/2015] [Indexed: 11/05/2022] Open
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80
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Xiong J. Atg7 in development and disease: panacea or Pandora's Box? Protein Cell 2015; 6:722-34. [PMID: 26404030 PMCID: PMC4598325 DOI: 10.1007/s13238-015-0195-8] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 07/13/2015] [Indexed: 01/15/2023] Open
Abstract
Macroautophagy is an evolutionarily conserved intracellular degradation system used by life ranging from yeasts to mammals. The core autophagic machinery is composed of ATG (autophagy-related) protein constituents. One particular member of the ATG protein family, Atg7, has been the focus of recent research. Atg7 acts as an E1-like activating enzyme facilitating both microtubule-associated protein light chain 3 (LC3)-phosphatidylethanolamine and ATG12 conjugation. Thus, Atg7 stands at the hub of these two ubiquitin-like systems involving LC3 and Atg12 in autophagic vesicle expansion. In this review, I focus on the pleiotropic function of Atg7 in development, maintenance of health, and alternations of such control in disease.
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Affiliation(s)
- Jianhua Xiong
- Center for Molecular Medicine, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20892, USA.
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81
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Zhang B, Yu X, Xia H. The flavonoid luteolin enhances doxorubicin-induced autophagy in human osteosarcoma U2OS cells. Int J Clin Exp Med 2015; 8:15190-15197. [PMID: 26629003 PMCID: PMC4658892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 09/06/2015] [Indexed: 06/05/2023]
Abstract
Luteolin (LUT), a flavone, which is universally present as constituent of medicinal plants as well as some vegetables and spices, has been demonstrated display specific anti-carcinogenic effects. However, the mechanisms by which LUT inhibits human osteosarcoma growth remain unknown. The effects of LUT on cell growth in human osteosarcoma U2OS cells were measured by MTT assay and flowcytometry. The effects of LUT on morphological markers of autophagy in U2OS were analyzed by fluorescence microscopy and electron microscopy. Autophagic markers, beclin1 and LC3 were detected by western blotting. Here, we found that LUT induced autophagy in U2OS and acted as an enhancer to sensitize doxorubicin (DOX)-mediated autophagy signaling. The combined treatment of LUT and DOX greatly decreases the growth of U2OS, showing synergistic cytotoxicity. Our results indicate that LUT in combination with DOX maybe a novel strategy for the treatment of human osteosarcoma.
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Affiliation(s)
- Baoliang Zhang
- Southern Medical UniversityGuangzhou, China
- Department of Orthopedics, Guangzhou General Hospital of Guangzhou Military CommandGuangzhou, China
- Department of Spine Surgery, Yongzhou Central HospitalYongzhou, China
| | - Xin Yu
- Department of Orthopedics, Tai’an City Central HospitalTai’an, China
| | - Hong Xia
- Department of Orthopedics, Guangzhou General Hospital of Guangzhou Military CommandGuangzhou, China
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82
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Wei PF, Jin PP, Barui AK, Hu Y, Zhang L, Zhang JQ, Shi SS, Zhang HR, Lin J, Zhou W, Zhang YJ, Ruan RQ, Patra CR, Wen LP. Differential ERK activation during autophagy induced by europium hydroxide nanorods and trehalose: Maximum clearance of huntingtin aggregates through combined treatment. Biomaterials 2015; 73:160-74. [PMID: 26409001 DOI: 10.1016/j.biomaterials.2015.09.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 09/03/2015] [Accepted: 09/09/2015] [Indexed: 12/18/2022]
Abstract
Accelerating the clearance of intracellular protein aggregates through elevation of autophagy represents a viable approach for the treatment of neurodegenerative diseases. In our earlier report, we have demonstrated the enhanced degradation of mutant huntingtin protein aggregates through autophagy process induced by europium hydroxide nanorods [EHNs: Eu(III)(OH)3], but the underlying molecular mechanism of EHNs mediated autophagy was unclear. The present report reveals that EHNs induced autophagy does not follow the classical AKT-mTOR and AMPK signaling pathways. The inhibition of ERK1/2 phosphorylation using the specific MEK inhibitor U0126 partially abrogates the autophagy as well as the clearance of mutant huntingtin protein aggregates mediated by EHNs suggesting that nanorods stimulate the activation of MEK/ERK1/2 signaling pathway during autophagy process. In contrast, another mTOR-independent autophagy inducer trehalose has been found to induce autophagy without activating ERK1/2 signaling pathway. Interestingly, the combined treatment of EHNs and trehalose leads to more degradation of mutant huntingtin protein aggregates than that obtained with single treatment of either nanorods or trehalose. Our results demonstrate the rational that further enhanced clearance of intracellular protein aggregates, needed for diverse neurodegenerative diseases, may be achieved through the combined treatment of two or more autophagy inducers, which stimulate autophagy through different signaling pathways.
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Affiliation(s)
- Peng-Fei Wei
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui 230027, China
| | - Pei-Pei Jin
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Ayan Kumar Barui
- Biomaterials Group, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India; Academy of Scientific and Innovative Research (AcSIR), 2 Rafi Marg, New Delhi, India
| | - Yi Hu
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Li Zhang
- Department of Urology, The First Affiliated Hospital of Anhui Medical University and Institute of Urology, Anhui Medical University, 230022 Hefei, China
| | - Ji-Qian Zhang
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Shan-Shan Shi
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Hou-Rui Zhang
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Jun Lin
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui 230027, China
| | - Wei Zhou
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui 230027, China
| | - Yun-Jiao Zhang
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui 230027, China
| | - Ren-Quan Ruan
- Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui 230027, China
| | - Chitta Ranjan Patra
- Biomaterials Group, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India; Academy of Scientific and Innovative Research (AcSIR), 2 Rafi Marg, New Delhi, India.
| | - Long-Ping Wen
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui 230027, China.
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83
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Nicotine-induced cellular stresses and autophagy in human cancer colon cells: A supportive effect on cell homeostasis via up-regulation of Cox-2 and PGE(2) production. Int J Biochem Cell Biol 2015; 65:239-56. [PMID: 26100595 DOI: 10.1016/j.biocel.2015.06.013] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 05/28/2015] [Accepted: 06/12/2015] [Indexed: 12/12/2022]
Abstract
Nicotine, one of the active components in cigarette smoke, has been described to contribute to the protective effect of smoking in ulcerative colitis (UC) patients. Furthermore, the nicotinic acetylcholine receptor α7 subunit (α7nAChR) expressed on immune cells, is an essential regulator of inflammation. As intestinal epithelial cells also express α7nAChR, we investigated how nicotine could participate in the homeostasis of intestinal epithelial cells. First, using the human adenocarcinoma cell line HT-29, we revealed that nicotine, which triggers an influx of extracellular Ca(2+) following α7nAChR stimulation, induces mitochondrial reactive oxygen species (ROS) production associated with a disruption of the mitochondrial membrane potential and endoplasmic reticulum stress. This results in caspase-3 activation, which in turn induces apoptosis. Additionally, we have shown that nicotine induces a PI3-K dependent up-regulation of cyclooxygenase-2 (Cox-2) expression and prostaglandin E2 (PGE2) production. In this context, we suggest that this key mediator participates in the cytoprotective effects of nicotine against apoptosis by stimulating autophagy in colon cancer cells. Our results provide new insight into one potential mechanism by which nicotine could protect from UC and suggest an anti-inflammatory role for the cholinergic pathway at the epithelial cell level.
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84
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Falasca L, Agrati C, Petrosillo N, Di Caro A, Capobianchi MR, Ippolito G, Piacentini M. Molecular mechanisms of Ebola virus pathogenesis: focus on cell death. Cell Death Differ 2015; 22:1250-9. [PMID: 26024394 PMCID: PMC4495366 DOI: 10.1038/cdd.2015.67] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 03/31/2015] [Accepted: 04/20/2015] [Indexed: 12/28/2022] Open
Abstract
Ebola virus (EBOV) belongs to the Filoviridae family and is responsible for a severe disease characterized by the sudden onset of fever and malaise accompanied by other non-specific signs and symptoms; in 30–50% of cases hemorrhagic symptoms are present. Multiorgan dysfunction occurs in severe forms with a mortality up to 90%. The EBOV first attacks macrophages and dendritic immune cells. The innate immune reaction is characterized by a cytokine storm, with secretion of numerous pro-inflammatory cytokines, which induces a huge number of contradictory signals and hurts the immune cells, as well as other tissues. Other highly pathogenic viruses also trigger cytokine storms, but Filoviruses are thought to be particularly lethal because they affect a wide array of tissues. In addition to the immune system, EBOV attacks the spleen and kidneys, where it kills cells that help the body to regulate its fluid and chemical balance and that make proteins that help the blood to clot. In addition, EBOV causes liver, lungs and kidneys to shut down their functions and the blood vessels to leak fluid into surrounding tissues. In this review, we analyze the molecular mechanisms at the basis of Ebola pathogenesis with a particular focus on the cell death pathways induced by the virus. We also discuss how the treatment of the infection can benefit from the recent experience of blocking/modulating cell death in human degenerative diseases.
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Affiliation(s)
- L Falasca
- National Institute for Infectious Diseases, Lazzaro Spallanzani, Rome, Italy
| | - C Agrati
- National Institute for Infectious Diseases, Lazzaro Spallanzani, Rome, Italy
| | - N Petrosillo
- National Institute for Infectious Diseases, Lazzaro Spallanzani, Rome, Italy
| | - A Di Caro
- National Institute for Infectious Diseases, Lazzaro Spallanzani, Rome, Italy
| | - M R Capobianchi
- National Institute for Infectious Diseases, Lazzaro Spallanzani, Rome, Italy
| | - G Ippolito
- National Institute for Infectious Diseases, Lazzaro Spallanzani, Rome, Italy
| | - M Piacentini
- 1] National Institute for Infectious Diseases, Lazzaro Spallanzani, Rome, Italy [2] Department of Biology, University of Rome Tor Vergata, Rome, Italy
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85
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Cao J, Miao Q, Miao S, Bi L, Zhang S, Yang Q, Zhou X, Zhang M, Xie Y, Zhang J, Wang S. Tetramethylpyrazine (TMP) exerts antitumor effects by inducing apoptosis and autophagy in hepatocellular carcinoma. Int Immunopharmacol 2015; 26:212-20. [PMID: 25841319 DOI: 10.1016/j.intimp.2015.03.028] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 03/19/2015] [Accepted: 03/23/2015] [Indexed: 01/04/2023]
Abstract
Hepatocellular carcinoma (HCC) is one of the most common types of liver cancers with high recurrence rate and mortality rate. Recent studies have indicated that tetramethylpyrazine (TMP), a purified chemical extracted from Ligusticum wallichii Franchat (ChuanXiong), possessed antitumor effects on HCC, but detailed mechanism remains unclear. Our study aims at investigating the antitumor effect of TMP on HCC and its underlying mechanism. We found that TMP inhibited cell proliferation of HepG2 cells in a dose-dependent way, and xenograft tumor models also indicated that high concentrations of TMP administration inhibited tumor growth. Next, flow cytometric analysis and transmission electron microscope images showed that TMP enhanced cell apoptosis in HepG2 cells, and western blot results showed that TMP promoted cleavage of caspase-3 and PARP in vitro and in vivo. We also found that TMP caused autophagy in HCC in vitro and in vivo. In order to examine the role of autophagy in TMP-induced apoptosis, 3-methyladenine (3-MA) was used to block the action of autophagy. Our data showed TMP-induced autophagy might be a pro-apoptosis process in HCC. Furthermore, the results of anti-oxidative enzymes and oxidation-sensitive fluorescent probe 2, 7-dichlorofluorescein diacetate (DCFH-DA) indicated that TMP induced ROS generation and inhibition of ROS diminished the anticancer function of TMP. In conclusion, our studies provide new insights into the mechanisms underlying the antitumor effect of TMP and suggest that TMP can be a novel therapeutic regimen for HCC.
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Affiliation(s)
- Jiao Cao
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Qing Miao
- Department of Pharmacy, 401 Military Hospital, Qingdao 266071, China.
| | - Shan Miao
- Institute of Materia Medica, Fourth Military Medical University, Xi'an 710032, China
| | - Linlin Bi
- Institute of Materia Medica, Fourth Military Medical University, Xi'an 710032, China
| | - Song Zhang
- Department of Pharmacy, Tangdu Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Qian Yang
- Institute of Materia Medica, Fourth Military Medical University, Xi'an 710032, China
| | - Xuanxuan Zhou
- Institute of Materia Medica, Fourth Military Medical University, Xi'an 710032, China
| | - Meng Zhang
- Institute of Materia Medica, Fourth Military Medical University, Xi'an 710032, China
| | - Yanhua Xie
- Institute of Materia Medica, Fourth Military Medical University, Xi'an 710032, China
| | - Jin Zhang
- Department of Hand Surgery, 401 Military Hospital, Qingdao 266071, China
| | - Siwang Wang
- Institute of Materia Medica, Fourth Military Medical University, Xi'an 710032, China.
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86
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Mei L, Chen Y, Wang Z, Wang J, Wan J, Yu C, Liu X, Li W. Synergistic anti-tumour effects of tetrandrine and chloroquine combination therapy in human cancer: a potential antagonistic role for p21. Br J Pharmacol 2015; 172:2232-45. [PMID: 25521075 DOI: 10.1111/bph.13045] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 10/28/2014] [Accepted: 12/03/2014] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND AND PURPOSE Tetrandrine, a bisbenzylisoquinoline alkaloid isolated from the Chinese medicinal herb Stephaniae tetrandrae, has a long history in Chinese clinical applications to treat diverse diseases. Tetrandrine induced apoptosis or, at low concentrations, autophagy of human hepatocellular carcinoma cells. Here we have tested the effects of inhibitors of autophagy such as chloroquine, on the response to low concentrations of tetrandrine in cancer cells. EXPERIMENTAL APPROACH Cultures of several cancer cell lines, including Huh7, U251, HCT116 and A549 cells, were exposed to tetrandrine, chloroquine or a combination of these compounds. Cell viability and content of reactive oxygen species (ROS) were measured and synergy assessed by calculation of the combination index. Western blot and RT-PCR assays were also used along with fluorescence microscopy and histochemical techniques. KEY RESULTS Combinations of tetrandrine and chloroquine were more cytotoxic than the same concentrations used separately and these effects showed synergy. Such effects involved increased ROS generation and were dependent on caspase-3 but independent of Akt activity. Blockade of tetrandrine-induced autophagy with 3-methyladenine or bafilomycin-A1 induced apoptosis in cancer cells. Lack of p21 protein (p21(-/-) HCT116 cells) increased sensitivity to the apoptotic effects of the combination of tetrandrine and chloroquine. In a tumour xenograft model in mice, combined treatment with tetrandrine and chloroquine induced ROS accumulation and cell apoptosis, and decreased tumour growth. CONCLUSIONS AND IMPLICATIONS The combinations of tetrandrine and chloroquine exhibited synergistic anti-tumour activity, in vitro and in vivo. Our results suggest a novel therapeutic strategy for tumour treatment.
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Affiliation(s)
- Liufeng Mei
- College of Life Sciences, Wuhan University, Wuhan, China
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87
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Li J, Chen Y, Wan J, Liu X, Yu C, Li W. ABT-263 enhances sorafenib-induced apoptosis associated with Akt activity and the expression of Bax and p21((CIP1/WAF1)) in human cancer cells. Br J Pharmacol 2015; 171:3182-95. [PMID: 24571452 DOI: 10.1111/bph.12659] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 02/16/2014] [Accepted: 02/21/2014] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND AND PURPOSE Sorafenib, a potent inhibitor that targets several kinases associated with tumourigenesis and cell survival, has been approved for clinical treatment as a single agent. However, combining sorafenib with other agents improves its anti-tumour efficacy in various preclinical tumour models. ABT-263, a second-generation BH3 mimic, binds to the anti-apoptotic family members Bcl-2, Bcl-xL and Bcl-w, and has been demonstrated to enhance TNFSF10 (TRAIL)-induced apoptosis in human hepatocarcinoma cells. Hence, we investigated the effects of ABT-263 treatment combined with sorafenib. EXPERIMENTAL APPROACH The effects of ABT-263 combined with sorafenib were investigated in vitro, on cell viability, clone formation and apoptosis, and the mechanism examined using western blot and flow cytometry. This combination was also evaluated in vivo, in a mouse xenograft model; tumour growth, volume and weights were measured and a TUNEL assay performed. KEY RESULTS ABT-263 enhanced sorafenib-induced apoptosis while sparing non-tumourigenic cells. Although ABT-263 plus sorafenib significantly stimulated intracellular reactive oxygen species production and subsequent mitochondrial depolarization, this was not sufficient to trigger cell apoptosis. ABT-263 plus sorafenib significantly decreased Akt activity, which was, at least partly, involved in its effect on apoptosis. Bax and p21 (CIP1/WAF1) were shown to play a critical role in ABT-263 plus sorafenib-induced apoptosis. Combining sorafenib with ABT-263 dramatically increased its efficacy in vivo. CONCLUSION AND IMPLICATIONS The anti-tumour activity of ABT-263 plus sorafenib may involve the induction of intrinsic cell apoptosis via inhibition of Akt, and reduced Bax and p21 expression. Our findings offer a novel effective therapeutic strategy for tumour treatment.
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Affiliation(s)
- Jingru Li
- College of Life Sciences, Wuhan University, Wuhan, Hubei, China
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88
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Wang H, Liu T, Li L, Wang Q, Yu C, Liu X, Li W. Tetrandrine is a potent cell autophagy agonist via activated intracellular reactive oxygen species. Cell Biosci 2015; 5:4. [PMID: 25973171 PMCID: PMC4429611 DOI: 10.1186/2045-3701-5-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 12/30/2014] [Indexed: 12/27/2022] Open
Abstract
Background Autophagy is an evolutionarily conserved cellular process that involves the lysosomal degradation of proteins and organelles and the recycling of cellular components to ensure cellular survival under external or internal stress. Numerous data has indicated that autophagy can be successfully targeted for the treatment of multiple cancers. We have previously demonstrated that tetrandrine, a bisbenzylisoquinoline alkaloid isolated from the broadly used Chinese medicinal herb Stephaniae tetrandrae, exhibits potent antitumor effects when used either alone or in combination with other drugs. Results In the present study, we showed that tetrandrine is a broad-spectrum potent autophagy agonist. Although low-dose tetrandrine treatment does not affect cell viability, it can potently induce autophagy in a variety of cell lines, including cancerous cells and nontumorigenic cells. The autophagy inhibitors 3-methyladenine (3-MA) and chloroquine (CQ), effectively blocked tetrandrine-induced autophagy. Moreover, tetrandrine significantly triggered the induction of mitophagy. The underlying mechanisms are associated with the tetrandrine-induced production of intracellular reactive oxygen species (ROS), which plays a critical role in tetrandrine-induced autophagy. Conclusions Here, we report that tetrandrine is a potent cell autophagy agonist and may have a wide range of applications in the fields of antitumor therapy and basic scientific research.
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Affiliation(s)
- Haiqing Wang
- College of Life Sciences, Wuhan University, Wuhan, 430072 P R China
| | - Ting Liu
- College of Life Sciences, Wuhan University, Wuhan, 430072 P R China
| | - Lu Li
- College of Life Sciences, Wuhan University, Wuhan, 430072 P R China
| | - Qin Wang
- College of Life Sciences, Wuhan University, Wuhan, 430072 P R China
| | - Chunrong Yu
- College of Life Sciences, Wuhan University, Wuhan, 430072 P R China
| | - Xin Liu
- Ministry of Education Laboratory of Combinatorial Biosynthesis and Drug Discovery, College of pharmacy, Wuhan University, Wuhan, 430072 P R China
| | - Wenhua Li
- College of Life Sciences, Wuhan University, Wuhan, 430072 P R China
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89
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Poly (ADP-ribose) polymerase inhibition synergizes with the NF-κB inhibitor DHMEQ to kill hepatocellular carcinoma cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:2662-73. [DOI: 10.1016/j.bbamcr.2014.07.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 07/16/2014] [Accepted: 07/21/2014] [Indexed: 01/10/2023]
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90
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Xiao W, Jiang Y, Men Q, Yuan L, Huang Z, Liu T, Li W, Liu X. Tetrandrine induces G1/S cell cycle arrest through the ROS/Akt pathway in EOMA cells and inhibits angiogenesis in vivo. Int J Oncol 2014; 46:360-8. [PMID: 25355542 DOI: 10.3892/ijo.2014.2735] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 10/16/2014] [Indexed: 11/05/2022] Open
Abstract
Tetrandrine, a bisbenzylisoquinoline alkaloid, is known to inhibit tumor cell proliferation and induce apoptosis in cancer models in vitro and in vivo. In the present study, tetrandrine significantly inhibited the proliferation of mouse endothelial cells (EOMA cell) and induced G1/S arrest in EOMA cells, in which the expressions of cyclin D and cyclin E and CDKs were downregulated. Tetrandrine treatment also caused intracellular accumulation of reactive oxygen species (ROS). Pretreatment with NAC, which is a ROS inhibitor, blocked G1/S cell arrest and cyclin regulation induced by tetrandrine, implying that ROS generation plays an important role in tetrandrine-induced cell cycle arrest. Furthermore, a decreased phospho-Akt protein level after tetrandrine treatment was reversible with the removal of the intracellular ROS by NAC. Notably, overexpression of Akt decreased tetrandrine-induced G1/S arrest. Finally, we verified the antiangiogenic effects of tetrandrine in vivo in a liver cancer xenograft model in nude mice. In conclusion, tetrandrine inhibits EOMA cell growth through the ROS/Akt pathway, and it could be a promising compound for cancer therapy as an inhibitor of tumor vascular growth.
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Affiliation(s)
- Wenkai Xiao
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Yajie Jiang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Qiuxu Men
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Ling Yuan
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Zebo Huang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Ting Liu
- School of Life Science, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Wenhua Li
- School of Life Science, Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Xin Liu
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, and School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430071, P.R. China
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91
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Chaudhary P, Vishwanatha JK. c-Jun NH2-terminal kinase-induced proteasomal degradation of c-FLIPL/S and Bcl2 sensitize prostate cancer cells to Fas- and mitochondria-mediated apoptosis by tetrandrine. Biochem Pharmacol 2014; 91:457-73. [PMID: 25181458 DOI: 10.1016/j.bcp.2014.08.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 08/13/2014] [Accepted: 08/13/2014] [Indexed: 12/31/2022]
Abstract
Tetrandrine, a constituent of Chinese herb Stephania tetrandra, causes cell death in prostate cancer, but the molecular mechanisms leading to apoptosis is not known. Here we demonstrated that tetrandrine selectively inhibits the growth of prostate cancer PC3 and DU145 cells compared to normal prostate epithelial PWR-1E cells. Tetrandrine-induced cell death in prostate cancer cells is caused by reactive oxygen species (ROS)-mediated activation of c-Jun NH2-terminal kinase (JNK1/2). JNK1/2-mediated proteasomal degradation of c-FLIPL/S and Bcl2 proteins are key events in the sensitization of prostate cancer cells to Fas- and mitochondria-mediated apoptosis by tetrandrine. Tetrandrine-induced JNK1/2 activation caused the translocation of Bax to mitochondria by disrupting its association with Bcl2 which was accompanied by collapse of mitochondrial membrane potential (MMP), cytosolic release of cytochrome c and Smac, and apoptotic cell death. Additionally, tetrandrine-induced JNK1/2 activation increased the phosphorylation of Bcl2 at Ser70 and facilitated its degradation via the ubiquitin-mediated proteasomal pathway. In parallel, tetrandrine-mediated ROS generation also caused the induction of ligand-independent Fas-mediated apoptosis by activating procaspase-8 and Bid cleavage. Inhibition of procaspase-8 activation attenuated the cleavage of Bid, loss of MMP and caspase-3 activation suggest that tetrandrine-induced Fas-mediated apoptosis is associated with the mitochondrial pathway. Furthermore, most of the signaling effects of tetrandrine on apoptosis were significantly attenuated in the presence of antioxidant N-acetyl-l-cysteine, thereby confirming the involvement of ROS in these events. In conclusion, the results of the present study indicate that tetrandrine-induced apoptosis in prostate cancer cells is initiated by ROS generation and that both intrinsic and extrinsic pathway contributes to cell death.
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Affiliation(s)
- Pankaj Chaudhary
- Department of Molecular and Medical Genetics, Texas Center for Health Disparities and Institute for Cancer Research, University of North Texas Health Science Center, Fort Worth, TX 76107, USA
| | - Jamboor K Vishwanatha
- Department of Molecular and Medical Genetics, Texas Center for Health Disparities and Institute for Cancer Research, University of North Texas Health Science Center, Fort Worth, TX 76107, USA.
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92
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Autophagy protects C. elegans against necrosis during Pseudomonas aeruginosa infection. Proc Natl Acad Sci U S A 2014; 111:12480-5. [PMID: 25114220 DOI: 10.1073/pnas.1405032111] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Autophagy, a conserved pathway that delivers intracellular materials into lysosomes for degradation, is involved in development, aging, and a variety of diseases. Accumulating evidence demonstrates that autophagy plays a protective role against infectious diseases by diminishing intracellular pathogens, including bacteria, viruses, and parasites. However, the mechanism by which autophagy regulates innate immunity remains largely unknown. Here, we show that autophagy is involved in host defense against a pathogenic bacterium Pseudomonas aeruginosa in the metazoan Caenorhabditis elegans. P. aeruginosa infection induces autophagy via a conserved extracellular signal-regulated kinase (ERK). Intriguingly, impairment of autophagy does not influence the intestinal accumulation of P. aeruginosa, but instead induces intestinal necrosis. Inhibition of necrosis results in the survival of autophagy-deficient worms after P. aeruginosa infection. These findings reveal a previously unidentified role for autophagy in protection against necrosis triggered by pathogenic bacteria in C. elegans and implicate that such a function of autophagy may be conserved through the inflammatory response in diverse organisms.
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93
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Autophagy and microRNA dysregulation in liver diseases. Arch Pharm Res 2014; 37:1097-116. [PMID: 25015129 DOI: 10.1007/s12272-014-0439-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 06/29/2014] [Indexed: 02/07/2023]
Abstract
Autophagy is a catabolic process through which organelles and cellular components are sequestered into autophagosomes and degraded via fusion with lysosomes. Autophagy plays a role in many physiological processes, including stress responses, energy homeostasis, elimination of cellular organelles, and tissue remodeling. In addition, autophagy capacity changes in various disease states. A series of studies have shown that autophagy is strictly controlled to maintain homeostatic balance of energy metabolism and cellular organelle and protein turnover. These studies have also shown that this process is post-transcriptionally controlled by small noncoding microRNAs that regulate gene expression through complementary base pairing with mRNAs. Conversely, autophagy regulates the expression of microRNAs. Therefore, dysregulation of the link between autophagy and microRNA expression exacerbates the pathogenesis of various diseases. In this review, we summarize the roles of autophagy and microRNA dysregulation in the course of liver diseases, with the aim of understanding how microRNAs modify key autophagic effector molecules, and we discuss how this dysregulation affects both physiological and pathological conditions. This article may advance our understanding of the cellular and molecular bases of liver disease progression and promote the development of strategies for pharmacological intervention.
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94
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Ye Y, Li X, Wang W, Ouedraogo KC, Li Y, Gan C, Tan S, Zhou X, Wu M. Atg7 deficiency impairs host defense against Klebsiella pneumoniae by impacting bacterial clearance, survival and inflammatory responses in mice. Am J Physiol Lung Cell Mol Physiol 2014; 307:L355-63. [PMID: 24993132 DOI: 10.1152/ajplung.00046.2014] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Klebsiella pneumoniae (Kp) is a Gram-negative bacterium that can cause serious infections in humans. Autophagy-related gene 7 (Atg7) has been implicated in certain bacterial infections; however, the role of Atg7 in macrophage-mediated immunity against Kp infection has not been elucidated. Here we showed that Atg7 expression was significantly increased in murine alveolar macrophages (MH-S) upon Kp infection, indicating that Atg7 participated in host defense. Knocking down Atg7 with small-interfering RNA increased bacterial burdens in MH-S cells. Using cell biology assays and whole animal imaging analysis, we found that compared with wild-type mice atg7 knockout (KO) mice exhibited increased susceptibility to Kp infection, with decreased survival rates, decreased bacterial clearance, and intensified lung injury. Moreover, Kp infection induced excessive proinflammatory cytokines and superoxide in the lung of atg7 KO mice. Similarly, silencing Atg7 in MH-S cells markedly increased expression levels of proinflammatory cytokines. Collectively, these findings reveal that Atg7 offers critical resistance to Kp infection by modulating both systemic and local production of proinflammatory cytokines.
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Affiliation(s)
- Yan Ye
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Xuefeng Li
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Wenxue Wang
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Kiswendsida Claude Ouedraogo
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Yi Li
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Changpei Gan
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Shirui Tan
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Xikun Zhou
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
| | - Min Wu
- Department of Basic Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota
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95
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Liu K, Zhang G, Wang Z, Liu Y, Dong J, Dong X, Liu J, Cao J, Ao L, Zhang S. The protective effect of autophagy on mouse spermatocyte derived cells exposure to 1800MHz radiofrequency electromagnetic radiation. Toxicol Lett 2014; 228:216-24. [PMID: 24813634 DOI: 10.1016/j.toxlet.2014.05.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 04/30/2014] [Accepted: 05/02/2014] [Indexed: 01/06/2023]
Abstract
The increasing exposure to radiofrequency (RF) radiation emitted from mobile phone use has raised public concern regarding the biological effects of RF exposure on the male reproductive system. Autophagy contributes to maintaining intracellular homeostasis under environmental stress. To clarify whether RF exposure could induce autophagy in the spermatocyte, mouse spermatocyte-derived cells (GC-2) were exposed to 1800MHz Global System for Mobile Communication (GSM) signals in GSM-Talk mode at specific absorption rate (SAR) values of 1w/kg, 2w/kg or 4w/kg for 24h, respectively. The results indicated that the expression of LC3-II increased in a dose- and time-dependent manner with RF exposure, and showed a significant change at the SAR value of 4w/kg. The autophagosome formation and the occurrence of autophagy were further confirmed by GFP-LC3 transient transfection assay and transmission electron microscopy (TEM) analysis. Furthermore, the conversion of LC3-I to LC3-II was enhanced by co-treatment with Chloroquine (CQ), indicating autophagic flux could be enhanced by RF exposure. Intracellular ROS levels significantly increased in a dose- and time-dependent manner after cells were exposed to RF. Pretreatment with anti-oxidative NAC obviously decreased the conversion of LC3-I to LC3-II and attenuated the degradation of p62 induced by RF exposure. Meanwhile, phosphorylated extracellular-signal-regulated kinase (ERK) significantly increased after RF exposure at the SAR value of 2w/kg and 4w/kg. Moreover, we observed that RF exposure did not increase the percentage of apoptotic cells, but inhibition of autophagy could increase the percentage of apoptotic cells. These findings suggested that autophagy flux could be enhanced by 1800MHz GSM exposure (4w/kg), which is mediated by ROS generation. Autophagy may play an important role in preventing cells from apoptotic cell death under RF exposure stress.
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Affiliation(s)
- Kaijun Liu
- Institute of Computing Medicine, Third Military Medical University, Chongqing, 400038, China; Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Guowei Zhang
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Zhi Wang
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Yong Liu
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Jianyun Dong
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Xiaomei Dong
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Jinyi Liu
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Jia Cao
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Lin Ao
- Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing, 400038, China.
| | - Shaoxiang Zhang
- Institute of Computing Medicine, Third Military Medical University, Chongqing, 400038, China.
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96
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Abstract
The counterbalancing action of the endocytosis and secretory pathways maintains a dynamic equilibrium that regulates the composition of the plasma membrane, allowing it to maintain homeostasis and to change rapidly in response to alterations in the extracellular environment and/or intracellular metabolism. These pathways are intimately integrated with intercellular signaling systems and play critical roles in all cells. Studies in Caenorhabditis elegans have revealed diverse roles of membrane trafficking in physiology and development and have also provided molecular insight into the fundamental mechanisms that direct cargo sorting, vesicle budding, and membrane fisson and fusion. In this review, we summarize progress in understanding membrane trafficking mechanisms derived from work in C. elegans, focusing mainly on work done in non-neuronal cell-types, especially the germline, early embryo, coelomocytes, and intestine.
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Affiliation(s)
- Ken Sato
- Laboratory of Molecular Traffic, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma 371-8512, Japan. ;
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97
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Tetrandrine blocks autophagic flux and induces apoptosis via energetic impairment in cancer cells. Cell Death Dis 2014; 5:e1123. [PMID: 24625982 PMCID: PMC3973245 DOI: 10.1038/cddis.2014.84] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 12/19/2013] [Accepted: 01/07/2014] [Indexed: 01/01/2023]
Abstract
Lysosomes are acidic organelles that have a crucial role in degrading intracellular macromolecules and organelles during the final stage of autophagy. Tetrandrine (Tet), a bisbenzylisoquinoline alkaloid, was reported as an autophagy activator. Here, in contrast with previous studies, we show that Tet is a potent lysosomal deacidification agent and is able to block autophagic flux in the degradation stage. Single-agent Tet induces significant apoptosis both in vitro and in xenograft models. In the presence of Tet, apoptosis was preceded by a robust accumulation of autophagosomes and an increased level of microtubule-associated protein 1 light chain 3, type II (LC3-II). However, Tet increased the level of sequestosome 1 and decreased the turnover of LC3, indicating the blockade of autophagic flux in the degradation stage. As blockade of autophagic flux decreases the recycling of cellular fuels, Tet reduces the uptake of glucose in cancer cells. These effects lead to insufficient substrates for tricarboxylic acid (TCA) cycle and impaired oxidative phosphorylation. Blunting autophagosome formation using 3-methyladenine or genetic knockdown of Beclin-1 failed to rescue cells upon Tet treatment. By contrast, addition of methyl pyruvate to supplement TCA substrates protected Tet-treated tumor cells. These results demonstrate that energetic impairment is required in Tet-induced apoptosis. Tet, as a potent lysosomal inhibitor, is translatable to the treatment of malignant tumor patients.
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98
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Calyxin Y induces hydrogen peroxide-dependent autophagy and apoptosis via JNK activation in human non-small cell lung cancer NCI-H460 cells. Cancer Lett 2013; 340:51-62. [DOI: 10.1016/j.canlet.2013.06.021] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Revised: 06/16/2013] [Accepted: 06/20/2013] [Indexed: 01/21/2023]
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99
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Pan X, Liu D, Wang J, Zhang X, Yan M, Zhang D, Zhang J, Liu W. Peneciraistin C induces caspase-independent autophagic cell death through mitochondrial-derived reactive oxygen species production in lung cancer cells. Cancer Sci 2013; 104:1476-82. [PMID: 23952056 DOI: 10.1111/cas.12253] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 08/01/2013] [Accepted: 08/07/2013] [Indexed: 12/29/2022] Open
Abstract
Peneciraistin C (Pe-C) is a novel spiroketal compound isolated from the saline soil derived fungus Penicillium raistrickii. Our previous study showed that Pe-C exerted a potent cytotoxic effect on many kinds of cancer cell lines, especially on human lung cancer A549 cells. Here, we report the anticancer mechanisms of Pe-C in a variety of lung cancer cells. The results showed that Pe-C induced caspase-independent autophagic cell death and elevated mitochondrial-derived reactive oxygen species levels. Interestingly, if autophagy was blocked by 3-methyladenine or Atg5 siRNA, Pe-C triggered a shift from autophagic cell death into caspase-dependent apoptotic cell death. In addition, cotreatment with the antioxidant N-acetyl-(L)-cysteine or Mito-TEMPO could effectively reverse the effect of the enhanced reactive oxygen species production, which in turn almost completely prevented the cell death induced by Pe-C. Thus, this study provided new insights into the mechanisms underlying Pe-C-mediated cell death, which indicated that Pe-C could be a potential drug candidate for therapy of lung cancers.
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Affiliation(s)
- Xiaohong Pan
- Department of Pharmaceutical Sciences, Binzhou Medical University, Yantai, China
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100
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Hernández-Breijo B, Monserrat J, Román ID, González-Rodríguez Á, Fernández-Moreno MD, Lobo MVT, Valverde ÁM, Gisbert JP, Guijarro LG. Azathioprine desensitizes liver cancer cells to insulin-like growth factor 1 and causes apoptosis when it is combined with bafilomycin A1. Toxicol Appl Pharmacol 2013; 272:568-78. [PMID: 23958494 DOI: 10.1016/j.taap.2013.07.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 07/23/2013] [Accepted: 07/29/2013] [Indexed: 11/18/2022]
Abstract
Hepatoblastoma is a primary liver cancer that affects children, due to the sensitivity of this tumor to insulin-like growth factor 1 (IGF-1). In this paper we show that azathioprine (AZA) is capable of inhibiting IGF1-mediated signaling cascade in HepG2 cells. The efficiency of AZA on inhibition of proliferation differs in the evaluated cell lines as follows: HepG2 (an experimental model of hepatoblastoma)>Hep3B (derived from a hepatocellular carcinoma)>HuH6 (derived from a hepatoblastoma)>>HuH7 (derived from a hepatocellular carcinoma)=Chang Liver cells (a non-malignant cellular model). The effect of AZA in HepG2 cells has been proven to derive from activation of Ras/ERK/TSC2, leading to activation of mTOR/p70S6K in a sustained manner. p70S6K phosphorylates IRS-1 in serine 307 which leads to the uncoupling between IRS-1 and p85 (the regulatory subunit of PI3K) and therefore causing the lack of response of HepG2 to IGF-1. As a consequence, proliferation induced by IGF-1 is inhibited by AZA and autophagy increases leading to senescence of HepG2 cells. Our results suggest that AZA induces the autophagic process in HepG2 activating senescence, and driving to deceleration of cell cycle but not to apoptosis. However, when simultaneous to AZA treatment the autophagy was inhibited by bafilomycin A1 and the degradation of regulatory proteins of cell cycle (e.g. Rb, E2F, and cyclin D1) provoked apoptosis. In conclusion, AZA induces resistance in hepatoblastoma cells to IGF-1, which leads to autophagy activation, and causes apoptosis when it is combined with bafilomycin A1. We are presenting here a novel mechanism of action of azathioprine, which could be useful in treatment of IGF-1 dependent tumors, especially in its combination with other drugs.
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Affiliation(s)
- Borja Hernández-Breijo
- Departamento de Biología de Sistemas, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Universidad de Alcalá, 28871 Alcalá de Henares, Spain
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