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Yousefi P, Tabibzadeh A, Jawaziri AK, Mehrjoo M, Akhavan M, Allahqoli L, Salehiniya H. Autophagy-related genes polymorphism in hepatitis B virus-associated hepatocellular carcinoma: A systematic review. Immun Inflamm Dis 2024; 12:e1182. [PMID: 38353395 PMCID: PMC10865419 DOI: 10.1002/iid3.1182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Revised: 01/19/2024] [Accepted: 01/27/2024] [Indexed: 02/16/2024] Open
Abstract
BACKGROUND Chronic hepatitis B (CHB) virus is the most common risk factor for developing liver malignancy. Autophagy is an essential element in human cell maintenance. Several studies have demonstrated that autophagy plays a vital role in liver cancer at different stages. In this systematic review, we intend to investigate the role of polymorphism and mutations of autophagy-related genes (ATGs) in the pathogenesis and carcinogenesis of the hepatitis B virus (HBV). MATERIALS AND METHODS The search was conducted in online databases (Web of Science, PubMed, and Scopus) using Viruses, Infections, Polymorphism, Autophagy, and ATG. The study was conducted based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses criteria. RESULTS The primary search results led to 422 studies. By screening and eligibility evaluation, only four studies were relevant. The most important polymorphisms in hepatocellular carcinoma were rs2241880 in ATG16L1, rs77859116, rs510432, and rs548234 in ATG5. Furthermore, some polymorphisms are associated with an increased risk of HBV infection including, rs2241880 in ATG16L1 and rs6568431 in ATG5. CONCLUSION The current study highlights the importance of rs2241880 in ATG16L1 and rs77859116, rs510432, and rs548234 in ATG5 for HBV-induced HCC. Additionally, some mutations in ATG16L1 and ATG5 were important in risk of HBV infection. The study highlights the gap of knowledge in the field of ATG polymorphisms in HBV infection and HBV-induced HCC.
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Affiliation(s)
- Parastoo Yousefi
- Department of Virology, School of MedicineIran University of Medical SciencesTehranIran
| | - Alireza Tabibzadeh
- Department of Virology, School of MedicineIran University of Medical SciencesTehranIran
| | | | - Mohsen Mehrjoo
- Department of Biochemistry and Genetics, School of MedicineLorestan University of Medical SciencesKhorramabadIran
| | - Mandana Akhavan
- Department of Microbiology, Faculty of Medical SciencesIslamic Azad University, Arak BranchArakIran
| | - Leila Allahqoli
- Department of MidwiferyMinistry of Health and Medical EducationTehranIran
| | - Hamid Salehiniya
- Department of Epidemiology and Biostatistics, School of Health, Social Determinants of Health Research CenterBirjand University of Medical SciencesBirjandIran
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2
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Zhang Z, Shen C, Zhou F. The natural medicinal fungus Huaier promotes the anti-hepatoma efficacy of sorafenib through the mammalian target of rapamycin-mediated autophagic cell death. Med Oncol 2022; 39:221. [PMID: 36175804 DOI: 10.1007/s12032-022-01797-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 07/15/2022] [Indexed: 06/16/2023]
Abstract
Sorafenib (SOR) is currently the first line molecular targeting agent for advanced liver cancer therapy. Unfortunately, the insensitivity of liver cancer patients to SOR relatively limits its effectiveness. Huaier (HUA), a natural medicinal parasitic fungus found on the Sophora japonica Linn., has been widely employed as an adjuvant medication for numerous malignancies due to its potent anti-tumoral properties. This study aims to elucidate the enhancing therapeutic efficacy of HUA on SOR treatment in hepatocellular carcinoma (HCC) cells and mouse models. The CCK-8, clone formation, flow cytometry, immunofluorescence, transmission electron microscopy, western blot, bioinformatic analysis, and xenograft tumor assays were performed to evaluate the synergistic anti-hepatoma efficacy and mechanisms of HUA-SOR combination treatment on HCC cells. The results revealed combination treatment further inhibited proliferation, promoted apoptosis, enhanced autophagy of HCC cells, and suppressed the growth of transplanted tumors in mice, compared with either HUA or SOR treatment alone. For Hep3B and Huh7 cells, the optimal synergistic doses of HUA in combination with SOR were 8 mg/mL + 4 μM and 4 mg/mL + 2 μM, with combination index values of 0.646 and 0.588, respectively. Additionally, the underlying mechanisms might be related to biological processes that are mediated by mammalian target of rapamycin (mTOR). The combination treatment downregulated the protein expression levels of p-mTOR, p-p70S6K, p62, and upregulated the protein expression levels of Beclin-1 and LC3B-II. The mTOR activator MHY1485 attenuated the effect of HUA-SOR combination by inhibiting autophagy, suggesting HUA may potentiate the sensitivity of HCC cells to SOR by partially inducing mTOR-mediated autophagic cell death. These findings might provide a rationale experimental foundation for clinical applications of HUA with SOR.
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Affiliation(s)
- Zhengguang Zhang
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China.
| | - Cunsi Shen
- Jiangsu Key Laboratory of Pediatric Respiratory Disease, Institute of Pediatrics, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Fuqiong Zhou
- Central Laboratory, Nanjing Hospital of Chinese Medicine, Affiliated to Nanjing University of Chinese Medicine, Nanjing, 210022, China.
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3
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Cell Autophagy in NASH and NASH-Related Hepatocellular Carcinoma. Int J Mol Sci 2022; 23:ijms23147734. [PMID: 35887082 PMCID: PMC9322157 DOI: 10.3390/ijms23147734] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 07/10/2022] [Accepted: 07/11/2022] [Indexed: 12/21/2022] Open
Abstract
Autophagy, a cellular self-digestion process, involves the degradation of targeted cell components such as damaged organelles, unfolded proteins, and intracellular pathogens by lysosomes. It is a major quality control system of the cell and plays an important role in cell differentiation, survival, development, and homeostasis. Alterations in the cell autophagic machinery have been implicated in several disease conditions, including neurodegeneration, autoimmunity, cancer, infection, inflammatory diseases, and aging. In non-alcoholic fatty liver disease, including its inflammatory form, non-alcoholic steatohepatitis (NASH), a decrease in cell autophagic activity, has been implicated in the initial development and progression of steatosis to NASH and hepatocellular carcinoma (HCC). We present an overview of autophagy as it occurs in mammalian cells with an insight into the emerging understanding of the role of autophagy in NASH and NASH-related HCC.
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4
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Son J, Kim MJ, Lee JS, Kim JY, Chun E, Lee KY. Hepatitis B virus X Protein Promotes Liver Cancer Progression through Autophagy Induction in Response to TLR4 Stimulation. Immune Netw 2021; 21:e37. [PMID: 34796041 PMCID: PMC8568915 DOI: 10.4110/in.2021.21.e37] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/28/2021] [Accepted: 10/20/2021] [Indexed: 12/14/2022] Open
Abstract
Hepatitis B virus X (HBx) protein has been reported as a key protein regulating the pathogenesis of HBV-induced hepatocellular carcinoma (HCC). Recent evidence has shown that HBx is implicated in the activation of autophagy in hepatic cells. Nevertheless, the precise molecular and cellular mechanism by which HBx induces autophagy is still controversial. Herein, we investigated the molecular and cellular mechanism by which HBx is involved in the TRAF6-BECN1-Bcl-2 signaling for the regulation of autophagy in response to TLR4 stimulation, therefore influencing the HCC progression. HBx interacts with BECN1 (Beclin 1) and inhibits the association of the BECN1-Bcl-2 complex, which is known to prevent the assembly of the pre-autophagosomal structure. Furthermore, HBx enhances the interaction between VPS34 and TRAF6-BECN1 complex, increases the ubiquitination of BECN1, and subsequently enhances autophagy induction in response to LPS stimulation. To verify the functional role of HBx in liver cancer progression, we utilized different HCC cell lines, HepG2, SK-Hep-1, and SNU-761. HBx-expressing HepG2 cells exhibited enhanced cell migration, invasion, and cell mobility in response to LPS stimulation compared to those of control HepG2 cells. These results were consistently observed in HBx-expressed SK-Hep-1 and HBx-expressed SNU-761 cells. Taken together, our findings suggest that HBx positively regulates the induction of autophagy through the inhibition of the BECN1-Bcl-2 complex and enhancement of the TRAF6-BECN1-VPS34 complex, leading to enhance liver cancer migration and invasion.
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Affiliation(s)
- Juhee Son
- Department of Immunology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - Mi-Jeong Kim
- Department of Immunology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - Ji Su Lee
- Department of Immunology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - Ji Young Kim
- Department of Immunology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | | | - Ki-Young Lee
- Department of Immunology and Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea.,Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences & Technology, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea.,Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon, Korea
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5
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Flessa CM, Kyrou I, Nasiri-Ansari N, Kaltsas G, Papavassiliou AG, Kassi E, Randeva HS. Endoplasmic Reticulum Stress and Autophagy in the Pathogenesis of Non-alcoholic Fatty Liver Disease (NAFLD): Current Evidence and Perspectives. Curr Obes Rep 2021; 10:134-161. [PMID: 33751456 DOI: 10.1007/s13679-021-00431-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/23/2021] [Indexed: 02/06/2023]
Abstract
PURPOSE OF REVIEW Non-alcoholic fatty liver disease (NAFLD) is one of the most common causes of chronic liver disease with rising prevalence worldwide. Herein, we provide a comprehensive overview of the current knowledge supporting the role of ER stress and autophagy processes in NAFLD pathogenesis and progression. We also highlight the interrelation between these two pathways and the impact of ER stress and autophagy modulators on NAFLD treatment. RECENT FINDINGS The pathophysiological mechanisms involved in NAFLD progression are currently under investigation. The endoplasmic reticulum (ER) stress and the concomitant unfolded protein response (UPR) seem to contribute to its pathogenesis mainly due to high ER content in the liver which exerts significant metabolic functions and can be dysregulated. Furthermore, disruption of autophagy processes has also been identified in NAFLD. The crucial role of these two pathways in NAFLD is underlined by the fact that they have recently emerged as promising targets of therapeutic interventions. There is a greater need for finding the natural/chemical compounds and drugs which can modulate the ER stress pathway and autophagy for the treatment of NAFLD. Clarifying the inter-relation between these two pathways and their interaction with inflammatory and apoptotic mechanisms will allow the development of additional therapeutic options which can better target and reprogram the underlying pathophysiological pathways, aiming to attenuate NAFLD progression.
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Affiliation(s)
- Christina-Maria Flessa
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
- Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism (WISDEM), University Hospitals Coventry and Warwickshire NHS Trust, Coventry, CV2 2DX, UK
| | - Ioannis Kyrou
- Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism (WISDEM), University Hospitals Coventry and Warwickshire NHS Trust, Coventry, CV2 2DX, UK
- Aston Medical Research Institute, Aston Medical School, College of Health and Life Sciences, Aston University, B4 7ET, Birmingham, UK
- Division of Translational and Experimental Medicine, Metabolic and Vascular Health, Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
| | - Narjes Nasiri-Ansari
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
| | - Gregory Kaltsas
- Endocrine Unit, 1st Department of Propaedeutic and Internal Medicine, Laiko Hospital, National and Kapodistrian University of Athens, 11527, Athens, Greece
| | - Athanasios G Papavassiliou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece
| | - Eva Kassi
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527, Athens, Greece.
- Endocrine Unit, 1st Department of Propaedeutic and Internal Medicine, Laiko Hospital, National and Kapodistrian University of Athens, 11527, Athens, Greece.
| | - Harpal S Randeva
- Warwickshire Institute for the Study of Diabetes, Endocrinology and Metabolism (WISDEM), University Hospitals Coventry and Warwickshire NHS Trust, Coventry, CV2 2DX, UK.
- Division of Translational and Experimental Medicine, Metabolic and Vascular Health, Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.
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6
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Kim SY, Park C, Kim MY, Ji SY, Hwangbo H, Lee H, Hong SH, Han MH, Jeong JW, Kim GY, Son CG, Cheong J, Choi YH. ROS-Mediated Anti-Tumor Effect of Coptidis Rhizoma against Human Hepatocellular Carcinoma Hep3B Cells and Xenografts. Int J Mol Sci 2021; 22:4797. [PMID: 33946527 PMCID: PMC8124566 DOI: 10.3390/ijms22094797] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/22/2021] [Accepted: 04/27/2021] [Indexed: 12/24/2022] Open
Abstract
Coptidis Rhizoma is the dried rhizome from the Coptis chinensis Franch. that has been shown to have a number of beneficial pharmacological properties including antioxidant, anti-inflammatory, and anti-cancer effects. However, the anti-cancer effects of Coptidis Rhizoma on hepatocellular carcinoma (HCC) remain unclear. In this study, we investigated the anti-cancer properties of Coptidis Rhizoma ethanol extract (CR) in HCC Hep3B cells and in a xenograft mouse model. Our results showed that the CR significantly inhibited cell growth and induced apoptosis in Hep3B cells through increased expression of Bcl-2 associated x-protein (Bax) and cleavage of poly-ADP ribose polymerase (PARP), reduced expression of Bcl-2, and activated caspases. CR also increased the generation of intracellular reactive oxygen species (ROS), which caused a loss of mitochondrial membrane potential (MMP, ΔΨm) and activation of the mitochondria-mediated intrinsic apoptosis pathway. Moreover, N-acetylcysteine (NAC), a ROS inhibitor, markedly blocked the effects of CR on apoptotic pathways. CR also induced the expression of light chain 3 (LC3)-I/II, a key autophagy regulator, whereas CR-mediated autophagy was significantly suppressed by NAC. In addition, pre-treatment with NAC perfectly attenuated the inhibition of cell invasion and migration of CR-stimulated Hep3B cells. Furthermore, oral administration of CR suppressed Hep3B tumor growth in xenograft mice without toxicity, alterations to body weight, or changes in hematological and biochemical profiles. Taken together, our findings suggest that CR has anti-tumor effects that result from ROS generation, and may be a potential pharmacological intervention for HCC.
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Affiliation(s)
- So Young Kim
- Anti-Aging Research Center, Dongeui University, Busan 47340, Korea; (S.Y.K.); (M.Y.K.); (S.Y.J.); (H.H.); (H.L.)
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Korea;
- Department of Molecular Biology, Pusan National University, Busan 46241, Korea
| | - Cheol Park
- Division of Basic Sciences, College of Liberal Studies, Dong-Eui University, Busan 47340, Korea;
| | - Min Yeong Kim
- Anti-Aging Research Center, Dongeui University, Busan 47340, Korea; (S.Y.K.); (M.Y.K.); (S.Y.J.); (H.H.); (H.L.)
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Korea;
| | - Seon Yeong Ji
- Anti-Aging Research Center, Dongeui University, Busan 47340, Korea; (S.Y.K.); (M.Y.K.); (S.Y.J.); (H.H.); (H.L.)
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Korea;
| | - Hyun Hwangbo
- Anti-Aging Research Center, Dongeui University, Busan 47340, Korea; (S.Y.K.); (M.Y.K.); (S.Y.J.); (H.H.); (H.L.)
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Korea;
- Department of Molecular Biology, Pusan National University, Busan 46241, Korea
| | - Hyesook Lee
- Anti-Aging Research Center, Dongeui University, Busan 47340, Korea; (S.Y.K.); (M.Y.K.); (S.Y.J.); (H.H.); (H.L.)
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Korea;
| | - Su Hyun Hong
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Korea;
| | - Min Ho Han
- National Marine Biodiversity Institute of Korea, Seocheon 33662, Korea;
| | - Jin-Woo Jeong
- Nakdonggang National Institute of Biological Resources, Sangju 17104, Korea;
| | - Gi-Young Kim
- Department of Marine Life Sciences, School of Marine Biomedical Sciences, Jeju National University, Jeju 63243, Korea;
| | - Chang-Gue Son
- Institute of Bioscience & Integrative Medicine, Daejeon University, 176 split 75 Daedeokdae-ro Seo-gu, Daejeon 35235, Korea;
| | - JaeHun Cheong
- Department of Molecular Biology, Pusan National University, Busan 46241, Korea
| | - Yung Hyun Choi
- Anti-Aging Research Center, Dongeui University, Busan 47340, Korea; (S.Y.K.); (M.Y.K.); (S.Y.J.); (H.H.); (H.L.)
- Department of Biochemistry, College of Korean Medicine, Dong-eui University, Busan 47227, Korea;
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7
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Interplay of autophagy and cancer stem cells in hepatocellular carcinoma. Mol Biol Rep 2021; 48:3695-3717. [PMID: 33893928 DOI: 10.1007/s11033-021-06334-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 04/02/2021] [Indexed: 12/22/2022]
Abstract
Liver cancer is the sixth most common cancer and the fourth leading cause of cancer deaths in the world. The most common type of liver cancers is hepatocellular carcinoma (HCC). Autophagy is the cellular digestion of harmful components by sequestering the waste products into autophagosomes followed by lysosomal degradation for the maintenance of cellular homeostasis. The impairment of autophagy is highly associated with the development and progression of HCC although autophagy may be involved in tumour-suppressing cellular events. In regards to its protecting role, autophagy also shelters the cells from anoikis- a programmed cell death in anchorage-dependent cells detached from the surrounding extracellular matrix which facilitates metastasis in HCC. Liver cancer stem cells (LCSCs) have the ability for self-renewal and differentiation and are associated with the development and progression of HCC by regulating stemness, resistance and angiogenesis. Interestingly, autophagy is also known to regulate normal stem cells by promoting cellular survival and differentiation and maintaining cellular homeostasis. In this review, we discuss the basal autophagic mechanisms and double-faceted roles of autophagy as both tumour suppressor and tumour promoter in HCC, as well as its association with and contribution to self-renewal and differentiation of LCSCs.
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8
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Lai HY, Tsai HH, Yen CJ, Hung LY, Yang CC, Ho CH, Liang HY, Chen FW, Li CF, Wang JM. Metformin Resensitizes Sorafenib-Resistant HCC Cells Through AMPK-Dependent Autophagy Activation. Front Cell Dev Biol 2021. [DOI: 10.3389/fcell.2021.596655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Despite the activation of autophagy may enable residual cancer cells to survive and allow tumor relapse, excessive activation of autophagy may eventually lead to cell death. However, the details of the association of autophagy with primary resistance in hepatocellular carcinoma (HCC) remain less clear. In this study, cohort analysis revealed that HCC patients receiving sorafenib with HBV had higher mortality risk. We found that high epidermal growth factor receptor (EGFR) expression and activity may be linked to HBV-induced sorafenib resistance. We further found that the resistance of EGFR-overexpressed liver cancer cells to sorafenib is associated with low activity of AMP-activated protein kinase (AMPK) and CCAAT/enhancer binding protein delta (CEBPD) as well as insufficient autophagic activation. In response to metformin, the AMPK/cAMP-response element binding protein (CREB) pathway contributes to CEBPD activation, which promotes autophagic cell death. Moreover, treatment with metformin can increase sorafenib sensitivity through AMPK activation in EGFR-overexpressed liver cancer cells. This study suggests that AMPK/CEBPD-activated autophagy could be a potent strategy for improving the efficacy of sorafenib in HCC patients.
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9
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Lai HY, Tsai HH, Yen CJ, Hung LY, Yang CC, Ho CH, Liang HY, Chen FW, Li CF, Wang JM. Metformin Resensitizes Sorafenib-Resistant HCC Cells Through AMPK-Dependent Autophagy Activation. Front Cell Dev Biol 2021; 8:596655. [PMID: 33681180 PMCID: PMC7931828 DOI: 10.3389/fcell.2020.596655] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 12/22/2020] [Indexed: 12/23/2022] Open
Abstract
Despite the activation of autophagy may enable residual cancer cells to survive and allow tumor relapse, excessive activation of autophagy may eventually lead to cell death. However, the details of the association of autophagy with primary resistance in hepatocellular carcinoma (HCC) remain less clear. In this study, cohort analysis revealed that HCC patients receiving sorafenib with HBV had higher mortality risk. We found that high epidermal growth factor receptor (EGFR) expression and activity may be linked to HBV-induced sorafenib resistance. We further found that the resistance of EGFR-overexpressed liver cancer cells to sorafenib is associated with low activity of AMP-activated protein kinase (AMPK) and CCAAT/enhancer binding protein delta (CEBPD) as well as insufficient autophagic activation. In response to metformin, the AMPK/cAMP-response element binding protein (CREB) pathway contributes to CEBPD activation, which promotes autophagic cell death. Moreover, treatment with metformin can increase sorafenib sensitivity through AMPK activation in EGFR-overexpressed liver cancer cells. This study suggests that AMPK/CEBPD-activated autophagy could be a potent strategy for improving the efficacy of sorafenib in HCC patients.
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Affiliation(s)
- Hong-Yue Lai
- Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan.,Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan
| | - Hsin-Hwa Tsai
- Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan.,Department of Pathology, Chi Mei Medical Center, Tainan, Taiwan
| | - Chia-Jui Yen
- Department of Oncology, National Cheng Kung University Hospital, Tainan, Taiwan.,College of Medicine, National Cheng Kung University, Taipei, Taiwan
| | - Liang-Yi Hung
- Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan.,College of Medicine, National Cheng Kung University, Taipei, Taiwan.,College of Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ching-Chieh Yang
- Department of Radiation Oncology, Chi-Mei Medical Center, Tainan, Taiwan.,Department of Pharmacy, Chia-Nan University of Pharmacy and Science, Tainan, Taiwan
| | - Chung-Han Ho
- Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan.,Department of Hospital and Health Care Administration, Chia Nan University of Pharmacy and Science, Tainan, Taiwan
| | - Hsin-Yin Liang
- Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan.,International Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan
| | - Feng-Wei Chen
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chien-Feng Li
- Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan.,Department of Pathology, Chi Mei Medical Center, Tainan, Taiwan.,National Institute of Cancer Research, National Health Research Institute, Tainan, Taiwan.,Institute of Clinical Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Biotechnology, Southern Taiwan University of Science and Technology, Tainan, Taiwan
| | - Ju-Ming Wang
- Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan.,College of Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,International Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan, Taiwan.,College of Medical Science and Technology, Graduate Institute of Medical Sciences, Taipei Medical University, Taipei, Taiwan
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10
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Liao X, Bu Y, Jia Q. Traditional Chinese medicine as supportive care for the management of liver cancer: Past, present, and future. Genes Dis 2020; 7:370-379. [PMID: 32884991 PMCID: PMC7452431 DOI: 10.1016/j.gendis.2019.10.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/23/2019] [Accepted: 10/25/2019] [Indexed: 12/24/2022] Open
Abstract
Liver cancer is the sixth most commonly diagnosed cancer and the fourth leading cause of cancer death worldwide. Western medicine and therapies are the primary treatment strategies of hepatocellular carcinoma (HCC), but the general prognosis for HCC patients is still dismal. Under these circumstances, HCC prevention is particularly important. Traditional Chinese medicine (TCM) encompasses a wealth of documented therapeutic resources, and "preventative treatment" is the principle of TCM. In China, TCM has been used for HCC prevention for thousands of years, and has also been demonstrated to be effective for the treatment of HCC in modern China. However, the TCM theory for prevention and treatment of HCC is more widely accepted in China than abroad. In this review, we first summarize the herbs and ancient formulas with therapeutic effects on HCC. We also review the research status of TCM in modern medicine as well as the current obstacles in its development. Finally, we discuss the future of TCM in the context of precision and integrated medicine. After reviewing the literature, we believe that TCM, through ancient development, is an advanced method of cancer treatment with positive curative effects, despite its surrounding controversy. Furthermore, precise analyses and systematic research methods provides novel approaches to modernize TCM for the future.
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Affiliation(s)
- Xia Liao
- Department of Nutrition, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, China
| | - Yang Bu
- Department of Hepatobiliary Surgery, General Hospital, Ningxia Medical University, Yinchuan, 750001, China
| | - Qingan Jia
- Department of Hepatobiliary Surgery, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, China
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11
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Xue ST, Li K, Gao Y, Zhao LY, Gao Y, Yi H, Jiang JD, Li ZR. The role of the key autophagy kinase ULK1 in hepatocellular carcinoma and its validation as a treatment target. Autophagy 2020; 16:1823-1837. [PMID: 31986961 DOI: 10.1080/15548627.2019.1709762] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Although macroautophagy/autophagy is involved in hepatocellular carcinoma (HCC) initiation and development and has been identified as a mechanism of HCC therapy resistance, the role of ULK1 (unc-51 like autophagy activating kinase 1) in HCC remains unclear. Here, we report that both knockdown and knockout of ULK1 inhibited human HCC cell proliferation and invasion, and Ulk1 deletion abrogated tumor growth in a xenograft mouse model. Furthermore, ULK1 ablation in combination with sorafenib significantly inhibited HCC progression compared with sorafenib treatment alone or vehicle control. To identify candidate ULK1 inhibitors, we used a structure-based virtual docking approach to screen 3428 compounds. Among these compounds, XST-14 showed the highest affinity for the ULK1 protein and specifically blocked ULK1 kinase activity. Moreover, the Lys46, Tyr94 and Asp165 amino acid residues of ULK1 were required for its binding to XST-14 according to molecular docking and mutagenesis experiments. Functional assays revealed that XST-14 blocked autophagy and subsequently induced apoptosis and inhibited growth in HCC cells. More importantly, XST-14 acted synergistically with sorafenib to attenuate HCC progression by inhibiting sorafenib-induced autophagy activation both in vitro and in vivo. In addition, XST-14 was well tolerated and exhibited favorable drug metabolism and pharmacokinetic properties and low toxicity in mice. In summary, our study determined that ULK1 may represent a new therapeutic target for HCC and that targeting ULK1 in combination with sorafenib treatment may serve as a promising interventional strategy for treating HCC. Abbreviations: 3MA: 3-methyladenine; ADV: AutoDock Vina; ATP: adenosine triphosphate; EdU: 5-ethynyl-2'-deoxyuridine; ESI: electrospray ionization; HCC: hepatocellular carcinoma; IC50: half maximal inhibitory concentration; KD: kinase domain; q.o.d., every other day; SDS-PAGE, sodium dodecyl sulfate-polyacrylamide gel electrophoresis; SPR, surface plasmon resonance.
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Affiliation(s)
- Si-Tu Xue
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Ke Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Yang Gao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Lu-Yao Zhao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Yan Gao
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Hong Yi
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Jian-Dong Jiang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Zhuo-Rong Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
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Yiu SPT, Hui KF, Münz C, Lo KW, Tsao SW, Kao RYT, Yang D, Chiang AKS. Autophagy-Dependent Reactivation of Epstein-Barr Virus Lytic Cycle and Combinatorial Effects of Autophagy-Dependent and Independent Lytic Inducers in Nasopharyngeal Carcinoma. Cancers (Basel) 2019; 11:cancers11121871. [PMID: 31769432 PMCID: PMC6966612 DOI: 10.3390/cancers11121871] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/09/2019] [Accepted: 11/22/2019] [Indexed: 12/14/2022] Open
Abstract
Autophagy, a conserved cellular mechanism, is manipulated by a number of viruses for different purposes. We previously demonstrated that an iron-chelator-like small compound, C7, reactivates Epstein-Barr virus (EBV) lytic cycle by activating the ERK1/2-autophagy axis in epithelial cancers. Here, we aim to identify the specific stage of autophagy required for EBV lytic reactivation, determine the autophagy dependency of EBV lytic inducers including histone deacetylase inhibitor (HDACi) and C7/iron chelators, for EBV lytic reactivation and measure the combinatorial effects of these types of lytic inducers in nasopharyngeal carcinoma (NPC). Inhibition of autophagy initiation by 3-MA and autolysosome formation by chloroquine demonstrated that only autophagy initiation is required for EBV lytic reactivation. Gene knockdown of various autophagic proteins such as beclin-1, ATG5, ATG12, ATG7, LC3B, ATG10, ATG3 and Rab9, revealed the importance of ATG5 in EBV lytic reactivation. 3-MA could only abrogate lytic cycle induction by C7/iron chelators but not by HDACi, providing evidence for autophagy-dependent and independent mechanisms in EBV lytic reactivation. Finally, the combination of C7 and SAHA at their corresponding reactivation kinetics enhanced EBV lytic reactivation. These findings render new insights in the mechanisms of EBV lytic cycle reactivation and stimulate a rational design of combination drug therapy against EBV-associated cancers.
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Affiliation(s)
- Stephanie Pei Tung Yiu
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong, China; (S.P.T.Y.); (K.F.H.)
| | - Kwai Fung Hui
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong, China; (S.P.T.Y.); (K.F.H.)
| | - Christian Münz
- Viral Immunobiology, Institute of Experimental Immunology, University of Zurich, CH-8006 Zurich, Switzerland;
| | - Kwok-Wai Lo
- Department of Anatomical and Cellular Pathology, State Key Laboratory in Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China;
- Li Ka Shing Institute of Health Science, The Chinese University of Hong Kong, Hong Kong, China
| | - Sai Wah Tsao
- Department of Anatomy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China;
- Center for Nasopharyngeal Carcinoma Research, The University of Hong Kong, Hong Kong, China
| | - Richard Yi Tsun Kao
- Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China;
| | - Dan Yang
- Department of Chemistry, The University of Hong Kong, Hong Kong, China;
| | - Alan Kwok Shing Chiang
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong, China; (S.P.T.Y.); (K.F.H.)
- Center for Nasopharyngeal Carcinoma Research, The University of Hong Kong, Hong Kong, China
- Correspondence:
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Abdoli A, Nakhaie M, Feizi N, Salimi Jeda A, Ramezani A. Harmonized Autophagy Versus Full-Fledged Hepatitis B Virus: Victorious or Defeated. Viral Immunol 2019; 32:322-334. [PMID: 31483214 DOI: 10.1089/vim.2019.0042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Autophagy is a finely tuned process in the regulation of innate immunity to avoid excessive inflammatory responses and inflammasome signaling. In contrast, the results of recent studies have shown that autophagy may disease-dependently contribute to the pathogenesis of liver diseases, such as fibrosis, cirrhosis, and hepatocellular carcinoma (HCC) during hepatitis B virus (HBV) infection. HBV has learned to subvert the cell's autophagic machinery to promote its replication. Given the great impact of the autophagy mechanism on the HBV infection and HCC, recognizing these factors may be offered new hope for human intervention and treatment of chronic HBV. This review focuses on recent findings viewing the dual role of autophagy plays in the pathogenesis of HBV infected hepatocytes.
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Affiliation(s)
- Asghar Abdoli
- Department of Hepatitis and AIDS, Pasteur Institute of Iran, Tehran, Iran
| | - Mohsen Nakhaie
- Department of Virology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Neda Feizi
- Dipartimento di Medicina Interna e Specialità Mediche, Sapienza Università di Roma, Rome, Italy
| | - Ali Salimi Jeda
- Department of Virology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Amitis Ramezani
- Department of Hepatitis and AIDS, Pasteur Institute of Iran, Tehran, Iran
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14
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Yazdani HO, Huang H, Tsung A. Autophagy: Dual Response in the Development of Hepatocellular Carcinoma. Cells 2019; 8:cells8020091. [PMID: 30695997 PMCID: PMC6406383 DOI: 10.3390/cells8020091] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 01/22/2019] [Accepted: 01/26/2019] [Indexed: 12/16/2022] Open
Abstract
Autophagy is an evolutionary conserved intracellular mechanism which helps eukaryotic cells in maintaining their metabolic state to afford high-efficiency energy requirements. In the physiology of a normal liver and the pathogenesis of liver diseases, autophagy plays a crucial role. Autophagy has been found to be both upregulated and downregulated in different cancers providing the evidence that autophagy plays a dual role in suppressing and promoting cell survival. Hepatocellular carcinoma (HCC) is the most common primary liver cancer and the major leading cause of cancer mortality worldwide. In light of its high complexity and poor prognosis, it is essential to improve our understanding of autophagy’s role in HCC. In this review, we summarize the dual mechanism of autophagy in the development of HCC and elucidate the currently used therapeutic strategies for anti-HCC therapy.
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Affiliation(s)
- Hamza O Yazdani
- Department of Surgery, University of Pittsburgh, Pittsburg, PA 15213-2582, USA.
| | - Hai Huang
- Division of Surgical Oncology, Department of Surgery, The Ohio State University Wexner Medical Center, N924 Doan Hall, 410 West 10th Ave., Columbus, OH 43210, USA.
| | - Allan Tsung
- Division of Surgical Oncology, Department of Surgery, The Ohio State University Wexner Medical Center, N924 Doan Hall, 410 West 10th Ave., Columbus, OH 43210, USA.
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Bessone F, Razori MV, Roma MG. Molecular pathways of nonalcoholic fatty liver disease development and progression. Cell Mol Life Sci 2019; 76:99-128. [PMID: 30343320 PMCID: PMC11105781 DOI: 10.1007/s00018-018-2947-0] [Citation(s) in RCA: 325] [Impact Index Per Article: 65.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/10/2018] [Accepted: 10/15/2018] [Indexed: 02/06/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a main hepatic manifestation of metabolic syndrome. It represents a wide spectrum of histopathological abnormalities ranging from simple steatosis to nonalcoholic steatohepatitis (NASH) with or without fibrosis and, eventually, cirrhosis and hepatocellular carcinoma. While hepatic simple steatosis seems to be a rather benign manifestation of hepatic triglyceride accumulation, the buildup of highly toxic free fatty acids associated with insulin resistance-induced massive free fatty acid mobilization from adipose tissue and the increased de novo hepatic fatty acid synthesis from glucose acts as the "first hit" for NAFLD development. NAFLD progression seems to involve the occurrence of "parallel, multiple-hit" injuries, such as oxidative stress-induced mitochondrial dysfunction, endoplasmic reticulum stress, endotoxin-induced, TLR4-dependent release of inflammatory cytokines, and iron overload, among many others. These deleterious factors are responsible for the triggering of a number of signaling cascades leading to inflammation, cell death, and fibrosis, the hallmarks of NASH. This review is aimed at integrating the overwhelming progress made in the characterization of the physiopathological mechanisms of NAFLD at a molecular level, to better understand the factor influencing the initiation and progression of the disease.
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Affiliation(s)
- Fernando Bessone
- Hospital Provincial del Centenario, Facultad de Ciencias Médicas, Servicio de Gastroenterología y Hepatología, Universidad Nacional de Rosario, Rosario, Argentina
| | - María Valeria Razori
- Instituto de Fisiología Experimental (IFISE-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, 2000, Rosario, Argentina
| | - Marcelo G Roma
- Instituto de Fisiología Experimental (IFISE-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570, 2000, Rosario, Argentina.
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16
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Zhao YY, Tian Y, Liu L, Zhan JH, Hou X, Chen X, Zhou T, Huang Y, Zhang L. Inhibiting eEF-2 kinase-mediated autophagy enhanced the cytocidal effect of AKT inhibitor on human nasopharyngeal carcinoma. DRUG DESIGN DEVELOPMENT AND THERAPY 2018; 12:2655-2663. [PMID: 30214154 PMCID: PMC6120571 DOI: 10.2147/dddt.s169952] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Aim Our previous research showed that AKT inactivation via small molecule inhibitors did not induce significant apoptosis, but rather markedly increased autophagy in nasopharyngeal carcinoma (NPC). The purpose of the current study was to determine whether autophagy inhibition can enhance the anticancer efficacy of an AKT inhibitor (MK-2206). Materials and methods NPC cell lines CNE-2 (Epstein–Barr virus negative) and C666-1 (Epstein–Barr virus positive) were used to conduct the research. Autophagy induction effects were evaluated via Western blotting. Eukaryotic elongation factor-2 (eEF-2) kinase was specifically and stably knocked down using shRNA. The growth and proliferation of the cells were assessed by Cell Counting Kit-8. In CNE-2 xenograft tumors, the antitumor effects of an AKT inhibitor (MK-2206) combined with an eEF-2 kinase inhibitor (NH125) were tested. Results MK-2206 induced eEF-2 kinase-dependent autophagy in NPC cell lines. Knockdown of eEF-2 kinase using shRNA blunted the autophagy activated by MK-2206. Compared with treatment with MK-2206 alone, shRNA or NH125 suppressed eEF-2 kinase and increased the growth-inhibitory effect of MK-2206 on the human NPC cell lines. The synergistic effects of eEF-2 kinase inhibition and MK-2206 were similar to those of the combination of hydroxychloroquine and MK-2206. Moreover, NH125 showed good synergistic effects with MK-2206 in vivo. Conclusion eEF-2 kinase-mediated autophagy induced by AKT inhibition played a protective role in NPC cells. Inhibition of eEF-2 kinase may be an effective method for increasing the efficacy of an AKT inhibitor such as MK-2206 in NPC.
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Affiliation(s)
- Yuan-Yuan Zhao
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
| | - Ying Tian
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
| | - Lin Liu
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China, .,Zhaoqing Medical College, Zhaoqing, Guangdong Province, People's Republic of China
| | - Jian-Hua Zhan
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
| | - Xue Hou
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
| | - Xi Chen
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
| | - Ting Zhou
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
| | - Yan Huang
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
| | - Li Zhang
- Department of Medical Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China,
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Marin JJG, Lozano E, Perez MJ. Lack of mitochondrial DNA impairs chemical hypoxia-induced autophagy in liver tumor cells through ROS-AMPK-ULK1 signaling dysregulation independently of HIF-1α. Free Radic Biol Med 2016; 101:71-84. [PMID: 27687210 DOI: 10.1016/j.freeradbiomed.2016.09.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 09/20/2016] [Accepted: 09/24/2016] [Indexed: 01/04/2023]
Abstract
Alterations in mitochondrial DNA (mtDNA) and autophagy activation are common events in tumors. Here we have investigated the effect of mitochondrial genome depletion on chemical hypoxia-induced autophagy in liver tumor cells. Human SK-Hep-1 wild-type and mtDNA-depleted (Rho) cells were exposed to the hypoxia mimetic agents CoCl2 and deferoxamine (DFO). Up-regulation of HIF-1α, but not HIF-2α was observed. The expression of several HIF-1α target genes was also found. In human SK-Hep-1 and mouse Hepa 1-6 liver tumor cells, but not in the counterpart Rho derived lines, chemical hypoxia increased the abundance of autophagosomes and autolysosomes. In wild-type and Rho cells, chemical hypoxia induced down-regulation of HIF-1α-dependent autophagy inhibitors Bcl-2 and mTOR, whereas activation of AMPK/ULK1-mediated pro-autophagy pathway occurred only in wild-type cells. Chemical (compound C) and genetic (shRNA) inhibition of AMPK activation resulted in reduced autophagy. ATP levels were similar in both cell types, whereas constitutive and chemical hypoxia-induced reactive oxygen species (ROS) generation was lower in Rho cells. In wild-type cells, the antioxidant N-acetylcysteine blocked CoCl2- and DFO-induced AMPK and autophagy activation, but not endoplasmic reticulum stress induced by CoCl2. Enhanced Bax-α/Bcl-2 ratio and cell death was induced by hypoxia mimetic agents more markedly in wild-type than in Rho cells. Upon blocking autophagy activation with 3-methyladenine, DFO-induced cell death was partially prevented whereas that induced by CoCl2 was increased, but only in wild-type cells. These results suggest that mitochondrial dysfunction associated with the lack of mtDNA impairs the signaling pathways mediated by ROS, controlling autophagy activation in liver tumor cells, which may contributes to cancer development.
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Affiliation(s)
- Jose J G Marin
- Laboratory of Experimental Hepatology and Drug Targeting, IBSAL, CIBERehd. University of Salamanca, 37007 Salamanca, Spain
| | - Elisa Lozano
- Laboratory of Experimental Hepatology and Drug Targeting, IBSAL, CIBERehd. University of Salamanca, 37007 Salamanca, Spain
| | - Maria J Perez
- Laboratory of Experimental Hepatology and Drug Targeting, IBSAL, CIBERehd. University of Salamanca, 37007 Salamanca, Spain; University Hospital of Salamanca, IECSCYL-IBSAL, 37007 Salamanca, Spain.
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P300/CBP-associated factor (PCAF) inhibits the growth of hepatocellular carcinoma by promoting cell autophagy. Cell Death Dis 2016; 7:e2400. [PMID: 27711074 PMCID: PMC5133959 DOI: 10.1038/cddis.2016.247] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 05/31/2016] [Accepted: 07/19/2016] [Indexed: 01/23/2023]
Abstract
Aberrant autophagic processes have been found to have fundamental roles in the pathogenesis of different kinds of tumors, including hepatocellular carcinoma (HCC). P300/CBP-associated factor (PCAF), a histone acetyltransferase (HAT), performs its function by acetylating both histone and non-histone proteins. Our previous studies showed that PCAF was downregulated in HCC tissues and its high expression was significantly associated with patient survival after surgery, serving as a prognostic marker. In this study we found that overexpression of PCAF induced autophagy of HCC cells and its knockdown depressed autophagy. As type II programmed cell death, autophagy induced by PCAF-elicited cell death in HCC cells. In vivo experiments confirmed that PCAF-induced autophagy inhibited tumor growth. Subsequent in vitro experiments showed that PCAF promoted autophagy by inhibiting Akt/mTOR signaling pathway. Our findings show that PCAF is a novel modulator of autophagy in HCC, and can serve as an attractive therapeutic strategy of HCC treatment.
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Zhang Y, Bao J, Wang K, Jia X, Zhang C, Huang B, Chen M, Wan JB, Su H, Wang Y, He C. Pulsatilla Saponin D Inhibits Autophagic Flux and Synergistically Enhances the Anticancer Activity of Chemotherapeutic Agents Against HeLa Cells. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2016; 43:1657-70. [PMID: 26732119 DOI: 10.1142/s0192415x15500949] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Pulsatilla saponin D (SB365), a saponin isolated from rhizoma of Pulsatilla chinensis (Bunge) Regel, exhibited anticancer activities in various cancer types. In the present study, we identified that SB365 was a potent inhibitor of autophagic flux in several cancer cell lines. SB365 induced a robust accumulation of autophagosomes as evidenced by monodansylaervarine (MDC) staining and increased protein levels of LC3-II. However, SB365 caused the accumulation of p62, a substrate that should be degraded through the autophagy-lysosomal pathway. These results indicated that SB365 was an inducer of autophagosome formation, but an inhibitor of autophagic flux. Interestingly, we found that SB365 synergistically enhanced the anticancer activity of chemotherapeutic agents against cervical cancer HeLa cells. Furthermore, our study demonstrated that SB365 increased the phosphorylation of ERK and inhibited the phosphorylation of mTOR and p70S6K, suggesting that their roles in the effects of SB365 on autophagy. These results suggest that SB365 could be a promising adjuvant anticancer agent.
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Affiliation(s)
- Yulin Zhang
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Jiaolin Bao
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Kai Wang
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Xuejing Jia
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Chao Zhang
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Borong Huang
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Meiwan Chen
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Jian-Bo Wan
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Huanxing Su
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Yitao Wang
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
| | - Chengwei He
- 1 State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau 999078, China
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20
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Pazhouhi M, Sariri R, Rabzia A, Khazaei M. Thymoquinone synergistically potentiates temozolomide cytotoxicity through the inhibition of autophagy in U87MG cell line. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2016; 19:890-898. [PMID: 27746872 PMCID: PMC5048126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVES Glioblastoma multiforme (GBM) is one of the most lethal forms of human cancer and temozolomide (TMZ) is currently part of the standard treatment for this disease. Combination therapy using natural substances can enhance the anti-cancer activity of TMZ. The purpose of this study was to evaluate the effect of TMZ in combination with thymoquinone (TQ) on human GBM cell line (U87MG). MATERIALS AND METHODS The cell line was treated with TMZ and/or TQ. Cell viability was assessed using trypan blue and MTT assay. The effect of TMZ and/or TQ on colony-forming ability of the cells was investigated. Apoptosis and autophagy were quantified by fluorescent dye staining. The expression level of two autophagy related genes (ATG) were assessed using RT-PCR. Furthermore, nitric oxide (NO) production was detected by Griess reaction. RESULTS After treatment with TMZ and/or TQ, the cell viability was reduced in a time- and dose-dependent manner, and the cell survival fraction (SF) was significantly decreased (P=0.000). Apoptosis index of U87MG cells was also significantly increased (P=0.000). Autophagy was significantly increased by TMZ (P=0.000) and decreased by TQ (P=0.018). Also TMZ and/or TQ significantly decreased NO production by U87MG cell (P=0.000). CONCLUSION TQ enhanced the anti-cancer activity of TMZ by inhibition of autophagy at the transcriptional level and decreased the colony-forming ability and NO production of U87MG cell line.
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Affiliation(s)
- Mona Pazhouhi
- Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
| | - Reyhaneh Sariri
- Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
| | - Arezou Rabzia
- Fertility and Infertility Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mozafar Khazaei
- Fertility and Infertility Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran,Corresponding author: Mozafar Khazaei. Fertility and Infertility Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran. Tel: +98-83-34274618; Fax: +98-83- 34281563;
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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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Lee YJ, Jang BK. The Role of Autophagy in Hepatocellular Carcinoma. Int J Mol Sci 2015; 16:26629-43. [PMID: 26561802 PMCID: PMC4661843 DOI: 10.3390/ijms161125984] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 10/26/2015] [Accepted: 10/30/2015] [Indexed: 12/23/2022] Open
Abstract
Autophagy is a catabolic process involved in cellular homeostasis under basal and stressed conditions. Autophagy is crucial for normal liver physiology and the pathogenesis of liver diseases. During the last decade, the function of autophagy in hepatocellular carcinoma (HCC) has been evaluated extensively. Currently, autophagy is thought to play a dual role in HCC, i.e., autophagy is involved in tumorigenesis and tumor suppression. Recent investigations of autophagy have suggested that autophagy biomarkers can facilitate HCC prognosis and the establishment of therapeutic approaches. In this review, we briefly summarize the current understanding of autophagy and discuss recent evidence for its role in HCC.
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MESH Headings
- AMP-Activated Protein Kinases/genetics
- AMP-Activated Protein Kinases/metabolism
- Animals
- Apoptosis Regulatory Proteins/genetics
- Apoptosis Regulatory Proteins/metabolism
- Autophagy/genetics
- Autophagy-Related Protein-1 Homolog
- Beclin-1
- Biomarkers, Tumor/genetics
- Biomarkers, Tumor/metabolism
- Carcinoma, Hepatocellular/diagnosis
- Carcinoma, Hepatocellular/genetics
- Carcinoma, Hepatocellular/metabolism
- Carcinoma, Hepatocellular/pathology
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Cell Transformation, Neoplastic/pathology
- Gene Expression Regulation, Neoplastic
- Humans
- Intracellular Signaling Peptides and Proteins/genetics
- Intracellular Signaling Peptides and Proteins/metabolism
- Liver Neoplasms/diagnosis
- Liver Neoplasms/genetics
- Liver Neoplasms/metabolism
- Liver Neoplasms/pathology
- Mechanistic Target of Rapamycin Complex 1
- Mice
- Multiprotein Complexes/genetics
- Multiprotein Complexes/metabolism
- Prognosis
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Signal Transduction
- TOR Serine-Threonine Kinases/genetics
- TOR Serine-Threonine Kinases/metabolism
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Affiliation(s)
- Yoo Jin Lee
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keimyung University School of Medicine, Daegu 700-712, Korea.
| | - Byoung Kuk Jang
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keimyung University School of Medicine, Daegu 700-712, Korea.
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Hu B, Wang SS, Du Q. Traditional Chinese medicine for prevention and treatment of hepatocarcinoma: From bench to bedside. World J Hepatol 2015; 7:1209-1232. [PMID: 26019736 PMCID: PMC4438495 DOI: 10.4254/wjh.v7.i9.1209] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 11/29/2014] [Accepted: 12/19/2014] [Indexed: 02/06/2023] Open
Abstract
Traditional Chinese medicine (TCM) has played a positive role in the management of hepatocarcinoma. Hepatocarcinoma patients may present Qi-stagnation, damp-heat, blood stasis, Qi-deficiency, Yin-deficiency and other TCM syndromes (Zheng). Modern treatments such as surgery, transarterial chemoembolization (TACE) and high intensity focus ultrasound treatment would influence the manifestation of TCM syndromes. Herbs with traditional efficacy of tonifying Qi, blood and Yin, soothing liver-Qi stagnation, clearing heat and detoxifying and dissolving stasis, have been demonstrated to be potent to prevent hepatocarcinogenesis. TCM has been widely used in all aspects of integrative therapy in hepatocarcinoma, including surgical resection, liver transplantation, TACE, local ablative therapies and even as monotherapy for middle-advanced stage hepatocarcinoma. Clinical practices have confirmed that TCM is effective to alleviate clinical symptoms, improve quality of life and immune function, prevent recurrence and metastasis, delay tumor progression, and prolong survival time in hepatocarcinoma patients. The effective mechanism of TCM against hepatocarcinoma is related to inducing apoptosis, autophagy, anoikis and cell senescence, arresting cell cycle, regulating immune function, inhibiting metastasis and angiogenesis, reversing drug resistance and enhancing effects of chemotherapy. Along with the progress of research in this field, TCM will contribute more to the prevention and treatment of hepatocarcinoma.
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Akl MR, Ayoub NM, Ebrahim HY, Mohyeldin MM, Orabi KY, Foudah AI, El Sayed KA. Araguspongine C induces autophagic death in breast cancer cells through suppression of c-Met and HER2 receptor tyrosine kinase signaling. Mar Drugs 2015; 13:288-311. [PMID: 25580621 PMCID: PMC4306938 DOI: 10.3390/md13010288] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 12/25/2014] [Indexed: 12/11/2022] Open
Abstract
Receptor tyrosine kinases are key regulators of cellular growth and proliferation. Dysregulations of receptor tyrosine kinases in cancer cells may promote tumorigenesis by multiple mechanisms including enhanced cell survival and inhibition of cell death. Araguspongines represent a group of macrocyclic oxaquinolizidine alkaloids isolated from the marine sponge Xestospongia species. This study evaluated the anticancer activity of the known oxaquinolizidine alkaloids araguspongines A, C, K and L, and xestospongin B against breast cancer cells. Araguspongine C inhibited the proliferation of multiple breast cancer cell lines in vitro in a dose-dependent manner. Interestingly, araguspongine C-induced autophagic cell death in HER2-overexpressing BT-474 breast cancer cells was characterized by vacuole formation and upregulation of autophagy markers including LC3A/B, Atg3, Atg7, and Atg16L. Araguspongine C-induced autophagy was associated with suppression of c-Met and HER2 receptor tyrosine kinase activation. Further in-silico docking studies and cell-free Z-LYTE assays indicated the potential of direct interaction between araguspongine C and the receptor tyrosine kinases c-Met and HER2 at their kinase domains. Remarkably, araguspongine C treatment resulted in the suppression of PI3K/Akt/mTOR signaling cascade in breast cancer cells undergoing autophagy. Induction of autophagic death in BT-474 cells was also associated with decreased levels of inositol 1,4,5-trisphosphate receptor upon treatment with effective concentration of araguspongine C. In conclusion, results of this study are the first to reveal the potential of araguspongine C as an inhibitor to receptor tyrosine kinases resulting in the induction of autophagic cell death in breast cancer cells.
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Affiliation(s)
- Mohamed R Akl
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, LA 71201, USA.
| | - Nehad M Ayoub
- Department of Clinical Pharmacy, Faculty of Pharmacy, Jordan University of Science and Technology, Irbid 22110, Jordan.
| | - Hassan Y Ebrahim
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, LA 71201, USA.
| | - Mohamed M Mohyeldin
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, LA 71201, USA.
| | - Khaled Y Orabi
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Health Sciences Center, Kuwait University, Safat 13110, Kuwait.
| | - Ahmed I Foudah
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, LA 71201, USA.
| | - Khalid A El Sayed
- Department of Basic Pharmaceutical Sciences, School of Pharmacy, University of Louisiana at Monroe, 1800 Bienville Drive, Monroe, LA 71201, USA.
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Autophagy and non-alcoholic fatty liver disease. BIOMED RESEARCH INTERNATIONAL 2014; 2014:120179. [PMID: 25295245 PMCID: PMC4175790 DOI: 10.1155/2014/120179] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Accepted: 07/30/2014] [Indexed: 02/07/2023]
Abstract
Autophagy, or cellular self-digestion, is a catabolic process that targets cell constituents including damaged organelles, unfolded proteins, and intracellular pathogens to lysosomes for degradation. Autophagy is crucial for development, differentiation, survival, and homeostasis. Important links between the regulation of autophagy and liver complications associated with obesity, non-alcoholic fatty liver disease (NAFLD), have been reported. The spectrum of these hepatic abnormalities extends from isolated steatosis to non-alcoholic steatohepatitis (NASH), steatofibrosis, which sometimes leads to cirrhosis, and hepatocellular carcinoma. NAFLD is one of the three main causes of cirrhosis and increases the risk of liver-related death and hepatocellular carcinoma. The pathophysiological mechanisms of the progression of a normal liver to steatosis and then more severe disease are complex and still unclear. The regulation of the autophagic flux, a dynamic response, and the knowledge of the role of autophagy in specific cells including hepatocytes, hepatic stellate cells, immune cells, and hepatic cancer cells have been extensively studied these last years. This review will provide insight into the current understanding of autophagy and its role in the evolution of the hepatic complications associated with obesity, from steatosis to hepatocellular carcinoma.
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Autophagy inhibits chemotherapy-induced apoptosis through downregulating Bad and Bim in hepatocellular carcinoma cells. Sci Rep 2014; 4:5382. [PMID: 24947039 PMCID: PMC4064348 DOI: 10.1038/srep05382] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Accepted: 06/02/2014] [Indexed: 12/13/2022] Open
Abstract
The tumor microenvironment, including ischemia, has been increasingly recognized as a critical factor in the process of tumor development. Hypoxia and nutrient deficiency resulting from ischemia widely exist in solid tumors. Recent studies have shown that hypoxia and nutrient deficiency contribute to chemoresistance by inducing autophagy, but the underlying mechanism remains unknown. This study aimed to explore the role of autophagy induced by low glucose and hypoxia (LH) in the chemoresistance of hepatocellular carcinoma cells. Our results demonstrated that LH induced autophagy and downregulated Bad and Bim in hepatocellular carcinoma cells. The inhibition of autophagy reversed the reduction of these pro-apoptotic factors during the LH treatment. Furthermore, Bad and Bim were also significantly downregulated by autophagy during the process that LH promoted the chemoresistance of hepatocellular carcinoma cells. In addition, RNAi or the overexpression of Bad and Bim can significantly reduce or increase chemotherapy-induced cell death, respectively. Taken together, these data indicate that the downregulation of Bad and Bim plays a significant role in the autophagy-induced chemoresistance of hepatocellular carcinoma cells.
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