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Falke S, Lieske J, Herrmann A, Loboda J, Karničar K, Günther S, Reinke PYA, Ewert W, Usenik A, Lindič N, Sekirnik A, Dretnik K, Tsuge H, Turk V, Chapman HN, Hinrichs W, Ebert G, Turk D, Meents A. Structural Elucidation and Antiviral Activity of Covalent Cathepsin L Inhibitors. J Med Chem 2024; 67:7048-7067. [PMID: 38630165 PMCID: PMC11089505 DOI: 10.1021/acs.jmedchem.3c02351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/22/2024] [Accepted: 03/28/2024] [Indexed: 05/15/2024]
Abstract
Emerging RNA viruses, including SARS-CoV-2, continue to be a major threat. Cell entry of SARS-CoV-2 particles via the endosomal pathway involves cysteine cathepsins. Due to ubiquitous expression, cathepsin L (CatL) is considered a promising drug target in the context of different viral and lysosome-related diseases. We characterized the anti-SARS-CoV-2 activity of a set of carbonyl- and succinyl epoxide-based inhibitors, which were previously identified as inhibitors of cathepsins or related cysteine proteases. Calpain inhibitor XII, MG-101, and CatL inhibitor IV possess antiviral activity in the very low nanomolar EC50 range in Vero E6 cells and inhibit CatL in the picomolar Ki range. We show a relevant off-target effect of CatL inhibition by the coronavirus main protease α-ketoamide inhibitor 13b. Crystal structures of CatL in complex with 14 compounds at resolutions better than 2 Å present a solid basis for structure-guided understanding and optimization of CatL inhibitors toward protease drug development.
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Affiliation(s)
- Sven Falke
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Julia Lieske
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Alexander Herrmann
- Institute
of Virology, Helmholtz Munich, Ingolstädter Landstraße 1, 85764 Neuherberg, Munich, Germany
| | - Jure Loboda
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Katarina Karničar
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Centre
of Excellence for Integrated Approaches in Chemistry and Biology of
Proteins, Jamova 39, 1000 Ljubljana, Slovenia
| | - Sebastian Günther
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Patrick Y. A. Reinke
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Wiebke Ewert
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Aleksandra Usenik
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Centre
of Excellence for Integrated Approaches in Chemistry and Biology of
Proteins, Jamova 39, 1000 Ljubljana, Slovenia
| | - Nataša Lindič
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Andreja Sekirnik
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Klemen Dretnik
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- The
Jožef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Hideaki Tsuge
- Faculty of
Life Sciences, Kyoto Sangyo University, Kyoto 603-8555, Japan
| | - Vito Turk
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Henry N. Chapman
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Hamburg
Centre for Ultrafast Imaging, Universität
Hamburg, Luruper Chaussee
149, 22761 Hamburg, Germany
- Department
of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Winfried Hinrichs
- Institute
of Biochemistry, Universität Greifswald, Felix-Hausdorff-Str. 4, 17489 Greifswald, Germany
| | - Gregor Ebert
- Institute
of Virology, Helmholtz Munich, Ingolstädter Landstraße 1, 85764 Neuherberg, Munich, Germany
- Institute
of Virology, Technical University of Munich, Trogerstraße 30, 81675 Munich, Germany
| | - Dušan Turk
- Department
of Biochemistry and Molecular and Structural Biology, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Centre
of Excellence for Integrated Approaches in Chemistry and Biology of
Proteins, Jamova 39, 1000 Ljubljana, Slovenia
| | - Alke Meents
- Center
for Free-Electron Laser Science CFEL, Deutsches
Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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Pu S, Pan Y, Zhang Q, You T, Yue T, Zhang Y, Wang M. Endoplasmic Reticulum Stress and Mitochondrial Stress in Drug-Induced Liver Injury. Molecules 2023; 28:molecules28073160. [PMID: 37049925 PMCID: PMC10095764 DOI: 10.3390/molecules28073160] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 03/26/2023] [Accepted: 03/29/2023] [Indexed: 04/05/2023] Open
Abstract
Drug-induced liver injury (DILI) is a widespread and harmful disease closely linked to mitochondrial and endoplasmic reticulum stress (ERS). Globally, severe drug-induced hepatitis, cirrhosis, and liver cancer are the primary causes of liver-related morbidity and mortality. A hallmark of DILI is ERS and changes in mitochondrial morphology and function, which increase the production of reactive oxygen species (ROS) in a vicious cycle of mutually reinforcing stress responses. Several pathways are maladapted to maintain homeostasis during DILI. Here, we discuss the processes of liver injury caused by several types of drugs that induce hepatocyte stress, focusing primarily on DILI by ERS and mitochondrial stress. Importantly, both ERS and mitochondrial stress are mediated by the overproduction of ROS, destruction of Ca2+ homeostasis, and unfolded protein response (UPR). Additionally, we review new pathways and potential pharmacological targets for DILI to highlight new possibilities for DILI treatment and mitigation.
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Affiliation(s)
- Sisi Pu
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Yangyang Pan
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Qian Zhang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Ting You
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Tao Yue
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Yuxing Zhang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
| | - Meng Wang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
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3
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Influence of Pholiota adiposa on gut microbiota and promote tumor cell apoptosis properties in H22 tumor-bearing mice. Sci Rep 2022; 12:8589. [PMID: 35597811 PMCID: PMC9124200 DOI: 10.1038/s41598-022-11041-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 04/06/2022] [Indexed: 11/08/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is a common type of cancer-prevalent worldwide-and one of the causes of cancer-related deaths. In this study, ethanol extracts from Pholiota adiposa (EPA) were used to identify possible targets for HCC treatment and their effects on intestinal microflora were analyzed. Methods: Male mice were randomly assigned to groups-the model group, cyclophosphamide (25 mg/kg/d), and EPA groups, in which the mice were categorized based on the different concentrations of each compound (100, 200, and 300 mg/kg/day). Relevant biochemical indicators were detected using ELISA, H&E staining, and TUNEL assay. Four tumor apoptosis-related proteins and genes, Cleaved Caspases, BAX, Bcl-2, and VEGF, were detected by immunohistochemical staining, western blotting, and RT-PCR. The total genomic DNA was obtained from the contents of the small intestine and colon and was sequenced. The V3 + V4 regions of bacterial 16 s rDNA (from 341 to 806) were amplified. Results: The tests revealed that EPA exhibited antitumor activity in vivo by promoting apoptosis and inhibiting angiogenesis. Moreover, EPA treatment could increase beneficial and decrease harmful microflorae. These results demonstrate that EPA may be a potential therapy for HCC.
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4
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Potential Drug Discovery for COVID-19 Treatment Targeting Cathepsin L Using a Deep Learning-Based Strategy. Comput Struct Biotechnol J 2022; 20:2442-2454. [PMID: 35602976 PMCID: PMC9110316 DOI: 10.1016/j.csbj.2022.05.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 01/06/2023] Open
Abstract
Cathepsin L(CTSL) is a promising therapeutic target for COVID-19. A new deep learning model was used to predict CTSL inhibitor based on structure. 5 molecules for inhibiting CTSL and treating COVID-19 at nmol level were identified. Daptomycin can distinctly inhibit CTSL and has potential for COVID-19 treatment.
Cathepsin L (CTSL), a cysteine protease that can cleave and activate the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike protein, could be a promising therapeutic target for coronavirus disease 2019 (COVID-19). However, there is still no clinically available CTSL inhibitor that can be used. Here, we applied Chemprop, a newly trained directed-message passing deep neural network approach, to identify small molecules and FDA-approved drugs that can block CTSL activity to expand the discovery of CTSL inhibitors for drug development and repurposing for COVID-19. We found 5 molecules (Mg-132, Z-FA-FMK, leupeptin hemisulfate, Mg-101 and calpeptin) that were able to significantly inhibit the activity of CTSL in the nanomolar range and inhibit the infection of both pseudotype and live SARS-CoV-2. Notably, we discovered that daptomycin, an FDA-approved antibiotic, has a prominent CTSL inhibitory effect and can inhibit SARS-CoV-2 pseudovirus infection. Further, molecular docking calculation showed stable and robust binding of these compounds with CTSL. In conclusion, this study suggested for the first time that Chemprop is ideally suited to predict additional inhibitors of enzymes and revealed the noteworthy strategy for screening novel molecules and drugs for the treatment of COVID-19 and other diseases with unmet needs.
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Zhang Y, Liang J, Jiang H, Qian M, Zhao W, Bai W. Protective effect of sterols extracted from Lotus plumule on ethanol-induced injury in GES-1 cells in vitro. Food Funct 2021; 12:12659-12670. [PMID: 34821900 DOI: 10.1039/d1fo02684d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In this study, sterols were isolated from Lotus plumule by Soxhlet extraction and saponification and were further characterized by GC-MS analysis. The results showed that the sterols extracted from Lotus plumule mainly contained β-sitosterol, fucosterol, and campesterol. Models were established in vitro to investigate the protective effects of Lotus plumule sterols (LPSs) on ethanol-induced injury in human gastric epithelium (GES-1) cells. The results showed that appropriate concentrations of LPSs and β-sitosterol could protect GES-1 cells from ethanol-induced injury by reducing ROS levels, reducing calcium ion release, increasing antioxidant enzyme activity and maintaining mitochondrial membrane potential. Western blot experiment results also showed that appropriate concentrations of LPSs and β-sitosterol could up-regulate the expression of the anti-apoptotic protein Bcl-2 and down-regulate the pro-apoptotic proteins Bax and caspase-3 in GES-1 cells. Meanwhile, sterol pretreatment groups down-regulated the protein expression levels of p-P38 and p-JNK in ethanol-damaged GES-1 cells and up-regulated the expression level of p-ERK, suggesting that sterols protect GES-1 cells from ethanol-induced damage by regulating the MAPK signaling pathway. Taken together, Lotus plumule sterols could effectively prevent gastric cell damage in vitro and suggest the potential application of LPSs as bioactive ingredients for healthy foods.
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Affiliation(s)
- Ying Zhang
- College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China. .,Guangdong Provincial Key Laboratory of Lingnan Specialty Food Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Jiao Liang
- College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
| | - Hao Jiang
- College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China. .,Guangdong Provincial Key Laboratory of Lingnan Specialty Food Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Min Qian
- College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China. .,Guangdong Provincial Key Laboratory of Lingnan Specialty Food Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Wenhong Zhao
- College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China. .,Guangdong Provincial Key Laboratory of Lingnan Specialty Food Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
| | - Weidong Bai
- College of Light Industry and Food Science, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China. .,Guangdong Provincial Key Laboratory of Lingnan Specialty Food Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
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6
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Zhang H, Cao R, Zeng F, Fan W, Guo L, Ma Q, Ke S. Bivalent β-Carbolines Inhibit Colorectal Cancer Growth through Inducing Autophagy. Chem Pharm Bull (Tokyo) 2021; 69:1104-1109. [PMID: 34719593 DOI: 10.1248/cpb.c21-00588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this study, a series of alkyl diamine linked bivalent β-carbolines was synthesized and evaluated as antitumor agent. The results demonstrated that most compounds displayed good antiproliferative activities with IC50 value lower than 10 µM against a panel of human tumor cell lines, and compound 8 was found to be the most potent antiproliferative agent with IC50 value of 1.39, 1.96, 1.42, 1.49, 1.32, 1.96 and 1.63 µM against human breast cancer cell line (MCF-7), human adenocarcinoma cell line (769-P), human malighant melanoma cell line (A375), human ovarian cancer cell line (SK-OV-3), human colon carcinoma cell line (HCT-116), human gastric cancer cell line (BGC-823) and human esophageal squamous carcinoma cell line (Eca-109), respectively. Further investigations on mechanism of action of this class of compound demonstrated that the representative compound 8 inhibited colorectal cancer growth through inducing autophagy.
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Affiliation(s)
- Huihui Zhang
- College of Key Laboratory of Study and Discovery of Small Targeted Molecules of Hunan Province, Department of Laboratory Medicine, Hunan Normal University School of Medicine
| | - Rihui Cao
- School of Chemistry, Sun Yat-sen University
| | - Feng Zeng
- Cancer Center, Renmin Hospital of Wuhan University
| | - Wenxi Fan
- Xinjiang Huashidan Pharmaceutical Co,. Ltd
| | - Liang Guo
- Xinjiang Huashidan Pharmaceutical Co,. Ltd
| | - Qin Ma
- Xinjiang Huashidan Pharmaceutical Co,. Ltd
| | - Shaobo Ke
- Cancer Center, Renmin Hospital of Wuhan University
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7
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Milligan JC, Zeisner TU, Papageorgiou G, Joshi D, Soudy C, Ulferts R, Wu M, Lim CT, Tan KW, Weissmann F, Canal B, Fujisawa R, Deegan T, Nagaraj H, Bineva-Todd G, Basier C, Curran JF, Howell M, Beale R, Labib K, O'Reilly N, Diffley JF. Identifying SARS-CoV-2 antiviral compounds by screening for small molecule inhibitors of Nsp5 main protease. Biochem J 2021; 478:2499-2515. [PMID: 34198327 PMCID: PMC8286836 DOI: 10.1042/bcj20210197] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 05/05/2021] [Accepted: 05/07/2021] [Indexed: 02/06/2023]
Abstract
The coronavirus 2019 (COVID-19) pandemic, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), spread around the world with unprecedented health and socio-economic effects for the global population. While different vaccines are now being made available, very few antiviral drugs have been approved. The main viral protease (nsp5) of SARS-CoV-2 provides an excellent target for antivirals, due to its essential and conserved function in the viral replication cycle. We have expressed, purified and developed assays for nsp5 protease activity. We screened the nsp5 protease against a custom chemical library of over 5000 characterised pharmaceuticals. We identified calpain inhibitor I and three different peptidyl fluoromethylketones (FMK) as inhibitors of nsp5 activity in vitro, with IC50 values in the low micromolar range. By altering the sequence of our peptidomimetic FMK inhibitors to better mimic the substrate sequence of nsp5, we generated an inhibitor with a subnanomolar IC50. Calpain inhibitor I inhibited viral infection in monkey-derived Vero E6 cells, with an EC50 in the low micromolar range. The most potent and commercially available peptidyl-FMK compound inhibited viral growth in Vero E6 cells to some extent, while our custom peptidyl FMK inhibitor offered a marked antiviral improvement.
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Affiliation(s)
- Jennifer C. Milligan
- Chromosome Replication Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Theresa U. Zeisner
- Cell Cycle Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - George Papageorgiou
- Peptide Chemistry STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Dhira Joshi
- Peptide Chemistry STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Christelle Soudy
- Peptide Chemistry STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Rachel Ulferts
- Cell Biology of Infection Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Mary Wu
- High Throughput Screening STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Chew Theng Lim
- Chromosome Replication Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Kang Wei Tan
- Chromosome Replication Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Florian Weissmann
- Chromosome Replication Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Berta Canal
- Chromosome Replication Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Ryo Fujisawa
- The MRC Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dundee DD1 5EH, U.K
| | - Tom Deegan
- The MRC Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dundee DD1 5EH, U.K
| | - Hema Nagaraj
- Peptide Chemistry STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Ganka Bineva-Todd
- Peptide Chemistry STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Clovis Basier
- Cell Cycle Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Joseph F. Curran
- Cell Cycle Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Michael Howell
- High Throughput Screening STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Rupert Beale
- Cell Biology of Infection Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Karim Labib
- The MRC Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dundee DD1 5EH, U.K
| | - Nicola O'Reilly
- Peptide Chemistry STP, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - John F.X. Diffley
- Chromosome Replication Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
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8
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Wang X, Bao H, Bau T. Investigation of the possible mechanism of polysaccharides extracted from Leucocalocybe mongolica in exerting antitumor effects in H22 tumor-bearing mice. J Food Biochem 2021; 45:e13514. [PMID: 33569819 DOI: 10.1111/jfbc.13514] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 09/05/2020] [Accepted: 09/22/2020] [Indexed: 01/01/2023]
Abstract
A response surface method was used to optimize the extraction of polysaccharides from Leucocalocybe mongolica. Moreover, the preliminary structural characteristics and antitumor activity of L. mongolica polysaccharide (LMP) were investigated. The results showed that the optimized extraction technological parameters for LMP were 93°C extraction temperature, 5 hr extraction time, and 30 ml/g liquid-to-solid ratio. The LMP content extracted under the optimal conditions was 6.64%. LC-MS/MS results indicated that LMP is a neutral polysaccharide composed of d-fructose, d-mannose, dextrose anhydrate, d-xylose, trehalose, and galactose. The tumor inhibition rate was significantly improved by LMP treatment. LMP had minimal toxicity based on the significant decrease in AST and BUN levels; VEGF protein levels were also significantly decreased. In contrast, the levels of IFN-γ, IL-2, IL-6, and TNF-α were improved. The results of ELISA, H&E staining, TUNEL assay, immunohistochemistry, and western blotting indicated that the LMP exhibited antitumor activity in vivo by promoting apoptosis, mediating inflammatory responses, and inhibiting angiogenesis. PRACTICAL APPLICATIONS: As one of the main bioactive components, fungal polysaccharide has always been a hot research topic. Fungal polysaccharides are carbohydrate polymers composed of monosaccharide units bound together by glycosidic linkages, which have been found to be involved in many biological processes. In this research, the LMP structure was analyzed, and the immunohistochemical and western blot analysis confirmed that, LMP could effectively reduce the generation of tumor angiogenesis, promote apoptosis of tumor cell sand inhibit tumor growth. The results of this study can effectively provide a basis for clinical research and development of antitumor drugs, and lay a foundation for the study of the antitumor effects of wild edible and medicinal fungi.
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Affiliation(s)
- Xiaoyan Wang
- Key Laboratory of Medicinal Fungal Resources and Development and Utilization, Jilin Agricultural University, Changchun, China.,Medical Academy, Changchun Science-Technology University, Changchun, China
| | - Haiying Bao
- Key Laboratory of Medicinal Fungal Resources and Development and Utilization, Jilin Agricultural University, Changchun, China
| | - Tolgor Bau
- Key Laboratory of Medicinal Fungal Resources and Development and Utilization, Jilin Agricultural University, Changchun, China
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9
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Wang X, Bao H, Bau T. Investigation of the possible mechanism of two kinds of sterols extracted from Leucocalocybe mongolica in inducing HepG2 cell apoptosis and exerting anti-tumor effects in H22 tumor-bearing mice. Steroids 2020; 163:108692. [PMID: 32645329 DOI: 10.1016/j.steroids.2020.108692] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/08/2020] [Accepted: 06/29/2020] [Indexed: 12/22/2022]
Abstract
UNLABELLED Sterols are one of the main components of medicinal fungi with an anti-tumor effect. In this study, ergosta-4, 6, 8(14), 22-tetraen-3-one (ET) and (22E, 24R)-ergosta-7, 22-dien-3β, 5α, 6β-triol (ED) were obtained from Leucocalocybe mongolica and were used for the first time to study their ability to induce apoptosis in HepG2 cells and their anti-tumor effects and related mechanism in H22 tumor-bearing mice. METHOD The chemical structures were defined by IR and NMR. In vitro, the CCK8 assay was used as a cytotoxicity assay. Flow cytometry was used for the HepG-2 cell apoptosis analysis, which was examined via annexin V-FITC/PI double staining, and the related expression levels of the apoptosis-associated proteins were determined by western blot analysis. In vivo, ICR male mice were randomly assigned to eight groups: the model group, CTX (25 mg/kg/d) group, and ET and ED groups, which were treated with three different concentrations of each compound (0.025, 0.05, and 0.1 mmol/kg/d). Relevant biochemical indicators were detected by ELISA assay, H & E staining, TUNEL assay, immunohistochemical staining and western blot. RESULTS In vitro, ET and ED showed significant cytotoxic effects against HepG2, MCF-7, and HeLa cells, especially HepG-2 cells, and both ED and ET demonstrated a good effect in inhibiting the proliferation of HepG-2 cells. In vivo, ET and ED significantly decreased the tumor volume and VEGF levels but increased the serum cytokine levels of IFN-γ, IL-2, IL-6 and TNF-α. H & E staining, TUNEL assay, immunohistochemical analysis, and western blotting indicated that the both ET and ED exhibited anti-tumor activity in vivo by promoting apoptosis and inhibiting angiogenesis. CONCLUSION These results indicated that both ET and ED have a strong inhibitory effect on the proliferation of HepG-2 cells in vitro and an anti-H22 tumor effect in vivo.
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Affiliation(s)
- Xiaoyan Wang
- Key Laboratory of Medicinal Fungal Resources and Development and Utilization, Jilin Agricultural University, Changchun 130118, China; Changchun Science-Technology University, Changchun 130600, China
| | - Haiying Bao
- Key Laboratory of Medicinal Fungal Resources and Development and Utilization, Jilin Agricultural University, Changchun 130118, China.
| | - Tolgor Bau
- Key Laboratory of Medicinal Fungal Resources and Development and Utilization, Jilin Agricultural University, Changchun 130118, China
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10
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Ma C, Sacco MD, Hurst B, Townsend JA, Hu Y, Szeto T, Zhang X, Tarbet B, Marty MT, Chen Y, Wang J. Boceprevir, GC-376, and calpain inhibitors II, XII inhibit SARS-CoV-2 viral replication by targeting the viral main protease. Cell Res 2020; 30:678-692. [PMID: 32541865 PMCID: PMC7294525 DOI: 10.1038/s41422-020-0356-z] [Citation(s) in RCA: 571] [Impact Index Per Article: 142.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 05/29/2020] [Indexed: 12/16/2022] Open
Abstract
A new coronavirus SARS-CoV-2, also called novel coronavirus 2019 (2019-nCoV), started to circulate among humans around December 2019, and it is now widespread as a global pandemic. The disease caused by SARS-CoV-2 virus is called COVID-19, which is highly contagious and has an overall mortality rate of 6.35% as of May 26, 2020. There is no vaccine or antiviral available for SARS-CoV-2. In this study, we report our discovery of inhibitors targeting the SARS-CoV-2 main protease (Mpro). Using the FRET-based enzymatic assay, several inhibitors including boceprevir, GC-376, and calpain inhibitors II, and XII were identified to have potent activity with single-digit to submicromolar IC50 values in the enzymatic assay. The mechanism of action of the hits was further characterized using enzyme kinetic studies, thermal shift binding assays, and native mass spectrometry. Significantly, four compounds (boceprevir, GC-376, calpain inhibitors II and XII) inhibit SARS-CoV-2 viral replication in cell culture with EC50 values ranging from 0.49 to 3.37 µM. Notably, boceprevir, calpain inhibitors II and XII represent novel chemotypes that are distinct from known substrate-based peptidomimetic Mpro inhibitors. A complex crystal structure of SARS-CoV-2 Mpro with GC-376, determined at 2.15 Å resolution with three protomers per asymmetric unit, revealed two unique binding configurations, shedding light on the molecular interactions and protein conformational flexibility underlying substrate and inhibitor binding by Mpro. Overall, the compounds identified herein provide promising starting points for the further development of SARS-CoV-2 therapeutics.
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Affiliation(s)
- Chunlong Ma
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA
| | - Michael Dominic Sacco
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, 33612, USA
| | - Brett Hurst
- Institute for Antiviral Research, Utah State University, Logan, UT, 84322, USA
- Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, UT, 84322, USA
| | - Julia Alma Townsend
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ, 85721, USA
| | - Yanmei Hu
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA
| | - Tommy Szeto
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA
| | - Xiujun Zhang
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, 33612, USA
| | - Bart Tarbet
- Institute for Antiviral Research, Utah State University, Logan, UT, 84322, USA
- Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, UT, 84322, USA
| | - Michael Thomas Marty
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ, 85721, USA
| | - Yu Chen
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, 33612, USA.
| | - Jun Wang
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, USA.
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11
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Synthesis of novel dimeric compounds containing triazole using click method and their selective antiproliferative and proapoptotic potential via mitochondrial apoptosis signaling. Med Chem Res 2020. [DOI: 10.1007/s00044-020-02510-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Ma C, Sacco MD, Hurst B, Townsend JA, Hu Y, Szeto T, Zhang X, Tarbet B, Marty MT, Chen Y, Wang J. Boceprevir, GC-376, and calpain inhibitors II, XII inhibit SARS-CoV-2 viral replication by targeting the viral main protease. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2020. [PMID: 32511378 PMCID: PMC7263507 DOI: 10.1101/2020.04.20.051581] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A novel coronavirus SARS-CoV-2, also called novel coronavirus 2019 (nCoV-19), started to circulate among humans around December 2019, and it is now widespread as a global pandemic. The disease caused by SARS-CoV-2 virus is called COVID-19, which is highly contagious and has an overall mortality rate of 6.96% as of May 4, 2020. There is no vaccine or antiviral available for SARS-CoV-2. In this study, we report our discovery of inhibitors targeting the SARS-CoV-2 main protease (Mpro). Using the FRET-based enzymatic assay, several inhibitors including boceprevir, GC-376, and calpain inhibitors II, and XII were identified to have potent activity with single-digit to submicromolar IC50 values in the enzymatic assay. The mechanism of action of the hits was further characterized using enzyme kinetic studies, thermal shift binding assays, and native mass spectrometry. Significantly, four compounds (boceprevir, GC-376, calpain inhibitors II and XII) inhibit SARS-CoV-2 viral replication in cell culture with EC50 values ranging from 0.49 to 3.37 μM. Notably, boceprevir, calpain inhibitors II and XII represent novel chemotypes that are distinct from known Mpro inhibitors. A complex crystal structure of SARS-CoV-2 Mpro with GC-376, determined at 2.15 Å resolution with three monomers per asymmetric unit, revealed two unique binding configurations, shedding light on the molecular interactions and protein conformational flexibility underlying substrate and inhibitor binding by Mpro. Overall, the compounds identified herein provide promising starting points for the further development of SARS-CoV-2 therapeutics.
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Affiliation(s)
- Chunlong Ma
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, United States
| | - Michael D Sacco
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, 33612, United States
| | - Brett Hurst
- Institute for Antiviral Research, Utah State University, Logan, UT, 84322, USA.,Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, UT, 84322, USA
| | - Julia A Townsend
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ, 85721, United States
| | - Yanmei Hu
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, United States
| | - Tommy Szeto
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, United States
| | - Xiujun Zhang
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, 33612, United States
| | - Bart Tarbet
- Institute for Antiviral Research, Utah State University, Logan, UT, 84322, USA.,Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, UT, 84322, USA
| | - Michael T Marty
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ, 85721, United States
| | - Yu Chen
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, 33612, United States
| | - Jun Wang
- Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ, 85721, United States
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13
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Zou P, Yuan S, Yang X, Zhai X, Wang J. Chitosan oligosaccharides with degree of polymerization 2–6 induces apoptosis in human colon carcinoma HCT116 cells. Chem Biol Interact 2018; 279:129-135. [DOI: 10.1016/j.cbi.2017.11.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 10/31/2017] [Accepted: 11/13/2017] [Indexed: 12/19/2022]
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14
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Zhang Z, Xiao X, Su T, Wu J, Ren J, Zhu J, Zhang X, Cao R, Du R. Synthesis, structure-activity relationships and preliminary mechanism of action of novel water-soluble 4-quinolone-3-carboxamides as antiproliferative agents. Eur J Med Chem 2017; 140:239-251. [DOI: 10.1016/j.ejmech.2017.09.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Revised: 09/08/2017] [Accepted: 09/11/2017] [Indexed: 11/24/2022]
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15
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Lin M, Li H, Zhao Y, Cai E, Zhu H, Gao Y, Liu S, Yang H, Zhang L, Tang G. 2-Naphthoic acid ergosterol ester, an ergosterol derivative, exhibits anti-tumor activity by promoting apoptosis and inhibiting angiogenesis. Steroids 2017; 122:9-15. [PMID: 28377207 DOI: 10.1016/j.steroids.2017.03.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 03/23/2017] [Accepted: 03/27/2017] [Indexed: 12/14/2022]
Abstract
Phytosterol is a natural component of vegetable oil and includes ergosterol (ER) and β-sitosterol. In this study, three new ergosterol monoester derivatives were obtained from the reflux reaction with ergosterol, organic acids (furoic acid, salicylic acid, and 2-naphthoic acid), EDCI, and DMAP in dichloromethane. The chemical structures were defined by IR and NMR. On the basis of the results, 2-naphthoic acid ergosterol ester (NE) had the highest tumor inhibition rate and was selected to study anti-tumor activity and its mechanism at doses of 0.025mmol/kg and 0.1mmol/kg in H22-tumor bearing mice. Compared with ER, NE exhibited more stronger anti-tumor activity in vivo. Furthermore, biochemical parameters of ALT, AST, BUN, and CRE showed that NE had little toxicity to mice. NE significantly improved serum cytokine levels of IFN-γ and decreased VEGF levels. Moreover, H&E staining, TUNEL assay, immunohistochemistry, and western blotting indicated that NE exhibited anti-tumor activity in vivo by promoting apoptosis and inhibiting angiogenesis. In brief, the present study provided a method to improve ER anti-tumor activity and a reference for a new anti-tumor agent.
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Affiliation(s)
- Mingzhu Lin
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
| | - Haijun Li
- Institute of Translational Medicine, The First Hospital of Jilin University, Changchun, China
| | - Yan Zhao
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China.
| | - Enbo Cai
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
| | - Hongyan Zhu
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
| | - Yugang Gao
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
| | - Shuangli Liu
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
| | - He Yang
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
| | - Lianxue Zhang
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
| | - Guosheng Tang
- College of Chinese Medicinal Materials, Jilin Agriculture University, Changchun, China
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16
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Chen G, Li H, Gao Y, Zhang L, Zhao Y. Flavored black ginseng exhibited antitumor activity via improving immune function and inducing apoptosis. Food Funct 2017; 8:1880-1889. [DOI: 10.1039/c6fo01870j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Flavored black ginseng rich in ginsenoside F2, Rg5 and protopanaxadiol exhibited antitumor activity via improving immune function and inducing apoptosis.
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Affiliation(s)
- Guilin Chen
- College of Chinese Medicinal Materials
- Jilin Agriculture University
- Changchun
- China
| | - Haijun Li
- Institute of Translational Medicine
- the First Hospital of Jilin University
- Changchun
- China
| | - Yugang Gao
- College of Chinese Medicinal Materials
- Jilin Agriculture University
- Changchun
- China
| | - Lianxue Zhang
- College of Chinese Medicinal Materials
- Jilin Agriculture University
- Changchun
- China
| | - Yan Zhao
- College of Chinese Medicinal Materials
- Jilin Agriculture University
- Changchun
- China
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17
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Chen Q, Yang L, Han M, Cai E, Zhao Y. Synthesis and pharmacological activity evaluation of arctigenin monoester derivatives. Biomed Pharmacother 2016; 84:1792-1801. [DOI: 10.1016/j.biopha.2016.10.093] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 10/26/2016] [Accepted: 10/30/2016] [Indexed: 10/20/2022] Open
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18
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Synthesis and mechanisms of action of novel harmine derivatives as potential antitumor agents. Sci Rep 2016; 6:33204. [PMID: 27625151 PMCID: PMC5021947 DOI: 10.1038/srep33204] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 08/16/2016] [Indexed: 12/12/2022] Open
Abstract
A series of novel harmine derivatives bearing a benzylindine substituent in position-1 of β-carboline ring were synthesized and evaluated as antitumor agents. The N2-benzylated β-carboline derivatives 3a–g represented the most interesting anticancer activities and compound 3c was found to be the most active agent to diverse cancer cell lines such as gastric carcinoma, melanoma and colorectal cancer. Notably, compound 3c showed low toxicity to normal cells. The treatment significantly induced cell apoptosis. Mechanistically, PI3K/AKT signaling pathway mediated compound 3c-induced apoptosis. Compound 3c inhibited phosphorylation of AKT and promoted the production of reactive oxygen species (ROS). The ROS scavenger, LNAC and GSH, could disturb the effect of compound 3c induced apoptosis and PI3K activity inhibitor LY294002 synergistically enhanced compound 3c efficacy. Moreover, the results from nude mice xenograft model showed that compound 3c treatment effectively inhibited tumor growth and decreased tumor weight. Collectively, our results demonstrated that compound 3c exerts apoptotic effect in cancer cells via suppression of phosphorylated AKT and evocation of ROS generation, which suggested that compound 3c might be served as a promising therapeutic agent for cancer treatment.
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19
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The Toxic Effect of ALLN on Primary Rat Retinal Neurons. Neurotox Res 2016; 30:392-406. [DOI: 10.1007/s12640-016-9624-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 04/04/2016] [Accepted: 04/16/2016] [Indexed: 10/21/2022]
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20
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Li SZ, Song Y, Zhang HH, Jin BX, Liu Y, Liu WB, Zhang XD, Du RL. UbcH10 overexpression increases carcinogenesis and blocks ALLN susceptibility in colorectal cancer. Sci Rep 2014; 4:6910. [PMID: 25376843 PMCID: PMC4223683 DOI: 10.1038/srep06910] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 10/15/2014] [Indexed: 12/18/2022] Open
Abstract
Cyclins are essential for cell proliferation, the cell cycle and tumorigenesis in all eukaryotes. UbcH10 regulates the degradation of cyclins in a ubiquitin-dependent manner. Here, we report that UbcH10 is likely involved in tumorigenesis. We found that cancer cells exposed to n-acetyl-leu-leu-norleucinal (ALLN) treatment and UbcH10 depletion exhibit a synergistic therapeutic effect. Abundant expression of UbcH10 drives resistance to ALLN-induced cell death, while cells deficient in UbcH10 were susceptible to ALLN-induced cell death. The depletion of UbcH10 hindered tumorigenesis both in vitro and in vivo, as assessed by colony formation, growth curve, soft agar and xenograft assays. These phenotypes were efficiently rescued through the introduction of recombinant UbcH10. In the UbcH10-deficient cells, alterations in the expression of cyclins led to cell cycle changes and subsequently decreases in tumorigenesis. The tumorigenesis of xenograft tumors from UbcH10-deficient cells treated with ALLN was decreased relative to wild-type cells treated with ALLN in nude mice. On the molecular level, we observed that UbcH10 deficiency enhances the activation of caspase 8 and caspase 3 but not caspase 9 to impair cell viability upon ALLN treatment. Collectively, our results suggest that, as an oncogene, UbcH10 is a potential drug target for the treatment of colorectal cancer.
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Affiliation(s)
- Shang-Ze Li
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yang Song
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Hui-Hui Zhang
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Bing-Xue Jin
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yi Liu
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Wen-Bin Liu
- College of Health Science and Nursing, Wuhan Polytechnic University, Wuhan 430023, China
| | - Xiao-Dong Zhang
- College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Run-Lei Du
- College of Life Sciences, Wuhan University, Wuhan 430072, China
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21
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Zhang HH, Li SZ, Zhang ZY, Hu XM, Hou PN, Gao L, Du RL, Zhang XD. Nemo-like kinase is critical for p53 stabilization and function in response to DNA damage. Cell Death Differ 2014; 21:1656-63. [PMID: 24926618 DOI: 10.1038/cdd.2014.78] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/30/2014] [Accepted: 05/05/2014] [Indexed: 12/26/2022] Open
Abstract
The DNA damage response (DDR) acts as a protective mechanism for maintaining cell homeostasis. Nemo-like kinase (NLK) is a serine/threonine-protein kinase that has an important role in many pathways; however, its function in the DDR has not yet been defined. In our study, NLK-deficient HCT116 cells were found to be resistant to etoposide-induced cell death. We demonstrated that NLK is required for p53 activation in response to DNA damage. Remarkably, mechanistic studies revealed that NLK interacts with p53 and stabilizes p53 by blocking MDM2-mediated p53 ubiquitination and degradation. Furthermore, NLK enhances p53 activity and affects expression downstream of p53. Interestingly, these functions of NLK are not related to its kinase activity. Consistent with these results, NLK-deficient cells have a resistance effect on DNA damage. Therefore, these findings emphasize that NLK is a novel factor in DDR mechanisms.
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Affiliation(s)
- H-H Zhang
- Department of Cell Biology, College of Life Sciences, Wuhan University, Wuhan, China
| | - S-Z Li
- Department of Cell Biology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Z-Y Zhang
- Department of Cell Biology, College of Life Sciences, Wuhan University, Wuhan, China
| | - X-M Hu
- Department of Cell Biology, College of Life Sciences, Wuhan University, Wuhan, China
| | - P-N Hou
- Department of Cell Biology, College of Life Sciences, Wuhan University, Wuhan, China
| | - L Gao
- Department of Cardiology, Institute of Cardiovascular Disease, Union Hospital, Tongji Medical College, Hua Zhong University of Science and Technology, Wuhan, China
| | - R-L Du
- Department of Cell Biology, College of Life Sciences, Wuhan University, Wuhan, China
| | - X-D Zhang
- Department of Cell Biology, College of Life Sciences, Wuhan University, Wuhan, China
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