1
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Tsopela V, Korakidis E, Lagou D, Kalliampakou KI, Milona RS, Kyriakopoulou E, Mpekoulis G, Gemenetzi I, Stylianaki EA, Sideris CD, Sioli A, Kefallinos D, Sideris DC, Aidinis V, Eliopoulos AG, Kambas K, Vassilacopoulou D, Vassilaki N. L-Dopa decarboxylase modulates autophagy in hepatocytes and is implicated in dengue virus-caused inhibition of autophagy completion. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024; 1871:119602. [PMID: 37778471 DOI: 10.1016/j.bbamcr.2023.119602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 09/13/2023] [Accepted: 09/24/2023] [Indexed: 10/03/2023]
Abstract
The enzyme L-Dopa Decarboxylase (DDC) synthesizes the catecholamine dopamine and the indolamine serotonin. Apart from its role in the brain as a neurotransmitter biosynthetic enzyme, DDC has been detected also in the liver and other peripheral organs, where it is implicated in cell proliferation, apoptosis, and host-virus interactions. Dengue virus (DENV) suppresses DDC expression at the later stages of infection, during which DENV also inhibits autophagosome-lysosome fusion. As dopamine affects autophagy in neuronal cells, we investigated the possible association of DDC with autophagy in human hepatocytes and examined whether DDC mediates the relationship between DENV infection and autophagy. We performed DDC silencing/overexpression and evaluated autophagic markers upon induction of autophagy, or suppression of autophagosome-lysosome fusion. Our results showed that DDC favored the autophagic process, at least in part, through its biosynthetic function, while knockdown of DDC or inhibition of DDC enzymatic activity prevented autophagy completion. In turn, autophagy induction upregulated DDC, while autophagy reduction by chemical or genetic (ATG14L knockout) ways caused the opposite effect. This study also implicated DDC with the cellular energetic status, as DDC silencing reduced the oxidative phosphorylation activity of the cell. We also report that upon DDC silencing, the repressive effect of DENV on the completion of autophagy was enhanced, and the inhibition of autolysosome formation did not exert an additive effect on viral proliferation. These data unravel a novel role of DDC in the autophagic process and suggest that DENV downregulates DDC expression to inhibit the completion of autophagy, reinforcing the importance of this protein in viral infections.
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Affiliation(s)
- Vassilina Tsopela
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - Evangelos Korakidis
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - Despoina Lagou
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | | | - Raphaela S Milona
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - Eirini Kyriakopoulou
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - George Mpekoulis
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - Ioanna Gemenetzi
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - Elli-Anna Stylianaki
- Institute for Fundamental Biomedical Research, Biomedical Sciences Research Center Alexander Fleming, 16672 Athens, Greece
| | | | - Aggelina Sioli
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - Dionysis Kefallinos
- School of Electrical Engineering and Computer Science, National Technical University of Athens, 157 73 Athens, Greece
| | - Diamantis C Sideris
- Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, 157 01 Athens, Greece
| | - Vassilis Aidinis
- Institute for Fundamental Biomedical Research, Biomedical Sciences Research Center Alexander Fleming, 16672 Athens, Greece
| | - Aristides G Eliopoulos
- Department of Biology, School of Medicine, NKUA, 115 27 Athens, Greece; Center of Basic Research, Biomedical Research Foundation Academy of Athens, 115 27 Athens, Greece
| | - Konstantinos Kambas
- Laboratory of Molecular Genetics, Department of Immunology, Hellenic Pasteur Institute, 115 21 Athens, Greece
| | - Dido Vassilacopoulou
- Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, 157 01 Athens, Greece
| | - Niki Vassilaki
- Laboratory of Molecular Virology, Hellenic Pasteur Institute, 115 21 Athens, Greece.
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2
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Lee D, Hong JH. Niemann-Pick Disease Type C (NPDC) by Mutation of NPC1 and NPC2: Aberrant Lysosomal Cholesterol Trafficking and Oxidative Stress. Antioxidants (Basel) 2023; 12:2021. [PMID: 38136141 PMCID: PMC10740957 DOI: 10.3390/antiox12122021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 11/13/2023] [Accepted: 11/17/2023] [Indexed: 12/24/2023] Open
Abstract
Cholesterol trafficking is initiated by the endocytic pathway and transported from endo/lysosomes to other intracellular organelles. Deficiencies in cholesterol-sensing and binding proteins NPC1 and NPC2 induce accumulation in lysosomes and the malfunction of trafficking to other organelles. Each organelle possesses regulatory factors to induce cholesterol trafficking. The mutation of NPC1 and NPC2 genes induces Niemann-Pick disease type C (NPDC), which is a hereditary disease and causes progressive neurodegeneration, developmental disability, hypotonia, and ataxia. Oxidative stress induces damage in NPDC-related intracellular organelles. Although studies on the relationship between NPDC and oxidation are relatively rare, several studies have reported the therapeutic potential of antioxidants in treating NPDC. Investigating antioxidant drugs to relieve oxidative stress and cholesterol accumulation is suggested to be a powerful tool for developing treatments for NPDC. Understanding NPDC provides challenging issues in understanding the oxidative stress-lysosome metabolism of the lipid axis. Thus, we elucidated the relationship between complexes of intracellular organelles and NPDC to develop our knowledge and suggested potential antioxidant reagents for NPDC therapy.
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Affiliation(s)
| | - Jeong Hee Hong
- Department of Health Sciences & Technology, GAIHST, Gachon University, 155 Getbeolro, Yeonsu-gu, Incheon 21999, Republic of Korea;
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3
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Bhuia MS, Chowdhury R, Sonia FA, Kamli H, Shaikh A, El-Nashar HAS, El-Shazly M, Islam MT. Anticancer Potential of the Plant-Derived Saponin Gracillin: A Comprehensive Review of Mechanistic Approaches. Chem Biodivers 2023; 20:e202300847. [PMID: 37547969 DOI: 10.1002/cbdv.202300847] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Revised: 08/02/2023] [Accepted: 08/04/2023] [Indexed: 08/08/2023]
Abstract
With the increasing prevalence of cancer and the toxic side effects of synthetic drugs, natural products are being developed as promising therapeutic approaches. Gracillin is a naturally occurring triterpenoid steroidal saponin with several therapeutic activities. It is obtained as a major compound from different Dioscorea species. This review was designated to summarize the research progress on the anti-cancer activities of gracillin focusing on the underlying cellular and molecular mechanisms, as well as its pharmacokinetic features. The data were collected (up to date as of May 1, 2023) from various reliable and authentic literatures comprising PubMed, Springer Link, Scopus, Wiley Online, Web of Science, ScienceDirect, and Google Scholar. The findings demonstrated that gracillin displays promising anticancer effects through various molecular mechanisms, including anti-inflammatory effects, apoptotic cell death, induction of oxidative stress, cytotoxicity, induction of genotoxicity, cell cycle arrest, anti-proliferative effect, autophagy, inhibition of glycolysis, and blocking of cancer cell migration. Additionally, this review highlighted the pharmacokinetic features of gracillin, indicating its lower oral bioavailability. As a conclusion, it can be proposed that gracillin could serve as a hopeful chemotherapeutic agent. However, further extensive clinical research is recommended to establish its safety, efficacy, and therapeutic potential in cancer treatment.
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Affiliation(s)
- Md Shimul Bhuia
- Department of Pharmacy, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, 8100, Bangladesh
| | - Raihan Chowdhury
- Department of Pharmacy, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, 8100, Bangladesh
| | - Fatema Akter Sonia
- Department of Pharmacy, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, 8100, Bangladesh
| | - Hossam Kamli
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha, 61421, Saudi Arabia
| | - Ahmad Shaikh
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha, 61421, Saudi Arabia
| | - Heba A S El-Nashar
- Department of Pharmacognosy, Faculty of Pharmacy, Ain Shams University, Abbassia, 11566, Cairo, Egypt
| | - Mohamed El-Shazly
- Department of Pharmacognosy, Faculty of Pharmacy, Ain Shams University, Abbassia, 11566, Cairo, Egypt
| | - Muhammad Torequl Islam
- Department of Pharmacy, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, 8100, Bangladesh
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4
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West G, Turunen M, Aalto A, Virtanen L, Li SP, Heliö T, Meinander A, Taimen P. A heterozygous p.S143P mutation in LMNA associates with proteasome dysfunction and enhanced autophagy-mediated degradation of mutant lamins A and C. Front Cell Dev Biol 2022; 10:932983. [PMID: 36111332 PMCID: PMC9468711 DOI: 10.3389/fcell.2022.932983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 07/27/2022] [Indexed: 01/09/2023] Open
Abstract
Lamins A and C are nuclear intermediate filament proteins that form a proteinaceous meshwork called lamina beneath the inner nuclear membrane. Mutations in the LMNA gene encoding lamins A and C cause a heterogenous group of inherited degenerative diseases known as laminopathies. Previous studies have revealed altered cell signaling pathways in lamin-mutant patient cells, but little is known about the fate of mutant lamins A and C within the cells. Here, we analyzed the turnover of lamins A and C in cells derived from a dilated cardiomyopathy patient with a heterozygous p.S143P mutation in LMNA. We found that transcriptional activation and mRNA levels of LMNA are increased in the primary patient fibroblasts, but the protein levels of lamins A and C remain equal in control and patient cells because of a meticulous interplay between autophagy and the ubiquitin-proteasome system (UPS). Both endogenous and ectopic expression of p.S143P lamins A and C cause significantly reduced activity of UPS and an accumulation of K48-ubiquitin chains in the nucleus. Furthermore, K48-ubiquitinated lamins A and C are degraded by compensatory enhanced autophagy, as shown by increased autophagosome formation and binding of lamins A and C to microtubule-associated protein 1A/1B-light chain 3. Finally, chaperone 4-PBA augmented protein degradation by restoring UPS activity as well as autophagy in the patient cells. In summary, our results suggest that the p.S143P-mutant lamins A and C have overloading and deleterious effects on protein degradation machinery and pharmacological interventions with compounds enhancing protein degradation may be beneficial for cell homeostasis.
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Affiliation(s)
- Gun West
- Institute of Biomedicine and FICAN West Cancer Centre, University of Turku, Turku, Finland,InFLAMES Research Flagship Center, University of Turku and Åbo Akademi University, Turku, Finland
| | - Minttu Turunen
- Institute of Biomedicine and FICAN West Cancer Centre, University of Turku, Turku, Finland,InFLAMES Research Flagship Center, University of Turku and Åbo Akademi University, Turku, Finland
| | - Anna Aalto
- InFLAMES Research Flagship Center, University of Turku and Åbo Akademi University, Turku, Finland,Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - Laura Virtanen
- Institute of Biomedicine and FICAN West Cancer Centre, University of Turku, Turku, Finland,InFLAMES Research Flagship Center, University of Turku and Åbo Akademi University, Turku, Finland
| | - Song-Ping Li
- Institute of Biomedicine and FICAN West Cancer Centre, University of Turku, Turku, Finland,InFLAMES Research Flagship Center, University of Turku and Åbo Akademi University, Turku, Finland
| | - Tiina Heliö
- Heart and Lung Center Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Annika Meinander
- InFLAMES Research Flagship Center, University of Turku and Åbo Akademi University, Turku, Finland,Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - Pekka Taimen
- Institute of Biomedicine and FICAN West Cancer Centre, University of Turku, Turku, Finland,InFLAMES Research Flagship Center, University of Turku and Åbo Akademi University, Turku, Finland,Department of Pathology, Laboratory Division, Turku University Hospital, Turku, Finland,*Correspondence: Pekka Taimen,
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5
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Jang HJ, Chung KC. The ubiquitin‐proteasome system and autophagy mutually interact in neurotoxin‐induced dopaminergic cell death models of Parkinson’s disease. FEBS Lett 2022; 596:2898-2913. [DOI: 10.1002/1873-3468.14479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/01/2022] [Accepted: 08/02/2022] [Indexed: 11/05/2022]
Affiliation(s)
- Hye Ji Jang
- Department of Systems Biology, College of Life Science and Biotechnology Yonsei University Seoul 03722 Korea
| | - Kwang Chul Chung
- Department of Systems Biology, College of Life Science and Biotechnology Yonsei University Seoul 03722 Korea
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6
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Dunsmore L, Navo CD, Becher J, de Montes EG, Guerreiro A, Hoyt E, Brown L, Zelenay V, Mikutis S, Cooper J, Barbieri I, Lawrinowitz S, Siouve E, Martin E, Ruivo PR, Rodrigues T, da Cruz FP, Werz O, Vassiliou G, Ravn P, Jiménez-Osés G, Bernardes GJL. Controlled masking and targeted release of redox-cycling ortho-quinones via a C-C bond-cleaving 1,6-elimination. Nat Chem 2022; 14:754-765. [PMID: 35764792 PMCID: PMC9252919 DOI: 10.1038/s41557-022-00964-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 05/03/2022] [Indexed: 12/15/2022]
Abstract
Natural products that contain ortho-quinones show great potential as anticancer agents but have been largely discarded from clinical development because their redox-cycling behaviour results in general systemic toxicity. Here we report conjugation of ortho-quinones to a carrier, which simultaneously masks their underlying redox activity. C-benzylation at a quinone carbonyl forms a redox-inactive benzyl ketol. Upon a specific enzymatic trigger, an acid-promoted, self-immolative C-C bond-cleaving 1,6-elimination mechanism releases the redox-active hydroquinone inside cells. By using a 5-lipoxygenase modulator, β-lapachone, we created cathepsin-B-cleavable quinone prodrugs. We applied the strategy for intracellular release of β-lapachone upon antibody-mediated delivery. Conjugation of protected β-lapachone to Gem-IgG1 antibodies, which contain the variable region of gemtuzumab, results in homogeneous, systemically non-toxic and conditionally stable CD33+-specific antibody-drug conjugates with in vivo efficacy against a xenograft murine model of acute myeloid leukaemia. This protection strategy could allow the use of previously overlooked natural products as anticancer agents, thus extending the range of drugs available for next-generation targeted therapeutics.
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Affiliation(s)
- Lavinia Dunsmore
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK
| | - Claudio D Navo
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Derio-Bizkaia, Spain
| | - Julie Becher
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK
| | | | - Ana Guerreiro
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal
| | - Emily Hoyt
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK
| | - Libby Brown
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK
- Biologics Engineering, R&D, AstraZeneca, Cambridge, UK
| | | | - Sigitas Mikutis
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK
| | - Jonathan Cooper
- Wellcome-MRC Cambridge Stem Cell Institute, Department of Haematology, University of Cambridge, Cambridge, UK
| | - Isaia Barbieri
- Division of Cellular and Molecular Pathology, Department of Pathology, University of Cambridge, Cambridge, UK
| | - Stefanie Lawrinowitz
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich Schiller University Jena, Jena, Germany
| | - Elise Siouve
- Biologics Engineering, R&D, AstraZeneca, Cambridge, UK
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Esther Martin
- Biologics Engineering, R&D, AstraZeneca, Cambridge, UK
| | - Pedro R Ruivo
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal
| | - Tiago Rodrigues
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal
| | - Filipa P da Cruz
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK
| | - Oliver Werz
- Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich Schiller University Jena, Jena, Germany
| | - George Vassiliou
- Wellcome-MRC Cambridge Stem Cell Institute, Department of Haematology, University of Cambridge, Cambridge, UK
| | - Peter Ravn
- Biologics Engineering, R&D, AstraZeneca, Cambridge, UK
- Department of Biotherapeutic Discovery, H. Lundbeck A/S, Valby, Denmark
| | - Gonzalo Jiménez-Osés
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Derio-Bizkaia, Spain.
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain.
| | - Gonçalo J L Bernardes
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, UK.
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal.
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7
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Combination of Ascorbic Acid and Menadione Induces Cytotoxic Autophagy in Human Glioblastoma Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:2998132. [PMID: 35368869 PMCID: PMC8967583 DOI: 10.1155/2022/2998132] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 02/08/2022] [Accepted: 02/19/2022] [Indexed: 01/18/2023]
Abstract
We investigated the ability of the ascorbic acid (AA) and menadione (MD) combination, the well-known reactive oxidative species- (ROS-) generating system, to induce autophagy in human U251 glioblastoma cells. A combination of AA and MD (AA+MD), in contrast to single treatments, induced necrosis-like cell death mediated by mitochondrial membrane depolarization and extremely high oxidative stress. AA+MD, and to a lesser extent MD alone, prompted the appearance of autophagy markers such as autophagic vacuoles, autophagosome-associated LC3-II protein, degradation of p62, and increased expression of beclin-1. While both MD and AA+MD increased phosphorylation of AMP-activated protein kinase (AMPK), the well-known autophagy promotor, only the combined treatment affected its downstream targets, mechanistic target of rapamycin complex 1 (mTORC1), Unc 51-like kinase 1 (ULK1), and increased the expression of several autophagy-related genes. Antioxidant N-acetyl cysteine reduced both MD- and AA+MD-induced autophagy, as well as changes in AMPK/mTORC1/ULK1 activity and cell death triggered by the drug combination. Pharmacological and genetic autophagy silencing abolished the toxicity of AA+MD, while autophagy upregulation enhanced the toxicity of both AA+MD and MD. Therefore, by upregulating oxidative stress, inhibiting mTORC1, and activating ULK1, AA converts MD-induced AMPK-dependent autophagy from nontoxic to cytotoxic. These results suggest that AA+MD or MD treatment in combination with autophagy inducers could be further investigated as a novel approach for glioblastoma therapy.
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8
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Liu Y, Guan X, Wang M, Wang N, Chen Y, Li B, Xu Z, Fu F, Zheng Z, Du C. Disulfiram/Copper induces antitumor activity against gastric cancer via the ROS/MAPK and NPL4 pathways. Bioengineered 2022; 13:6579-6589. [PMID: 35290151 PMCID: PMC9278967 DOI: 10.1080/21655979.2022.2038434] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Disulfiram (DSF) is an anti-alcoholism medication with superior antitumor activity and clinical safety; its antitumor mechanisms in gastric cancer (GC) have not been fully explored. In the present work, low nontoxic concentrations of copper (Cu) ions substantially enhanced DSF’s antitumor activity, inhibiting the proliferation and growth of GC cell lines. DSF/Cu elevated the generation of reactive oxygen species (ROS), and apoptosis was induced in an ROS-dependent manner. This process might involve primary inhibition GC by DSF/Cu through induction of apoptosis via the ROS/mitogen-activated protein kinase pathway. Disordering transportation of ubiquitinated protein may also fuel the process. In summary, we found that DSF exerts antitumor effects on GC. DSF/Cu should be considered as adjunctive therapy for GC.
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Affiliation(s)
- Yao Liu
- Department of Oncology, General Hospital of Northern Theater Command, Dalian Medical University, Shenyang, P. R. China
| | - Xin Guan
- Department of Oncology, Northeast International Hospital, Shenyang, P. R. China
| | - Meiling Wang
- Department of Oncology, General Hospital of Northern Theater Command, Shenyang, P. R. China
| | - Naixue Wang
- Department of Oncology, General Hospital of Northern Theater Command, Jinzhou Medical University, Shenyang, P. R. China
| | - Yutong Chen
- Department of Oncology, General Hospital of Northern Theater Command, China Medical University, Shenyang, P. R. China
| | - Baolei Li
- Department of Oncology, General Hospital of Northern Theater Command, Jinzhou Medical University, Shenyang, P. R. China
| | - Zhuxuan Xu
- Department of Oncology, General Hospital of Northern Theater Command, Dalian Medical University, Shenyang, P. R. China
| | - Fangwei Fu
- Department of Oncology, General Hospital of Northern Theater Command, Shenyang Pharmaceutical University, Shenyang, P. R. China
| | | | - Cheng Du
- Department of Oncology, General Hospital of Northern Theater Command, Shenyang, P. R. China
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9
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Feng L, Liang L, Zhang S, Yang J, Yue Y, Zhang X. HMGB1 downregulation in retinal pigment epithelial cells protects against diabetic retinopathy through the autophagy-lysosome pathway. Autophagy 2021; 18:320-339. [PMID: 34024230 PMCID: PMC8942416 DOI: 10.1080/15548627.2021.1926655] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Diabetic retinopathy (DR) is a serious complication of diabetes mellitus and currently one of the major causes of blindness. Several previous studies have demonstrated that autophagy, which is regulated by HMGB1 (high mobility group box 1), is involved in DR development. However, the role of autophagy in DR is quite complicated in that it promotes pericyte survival in early DR, whereas excessive autophagy causes excess stress and leads to necrosis. Therefore, this study aimed to investigate the relationship between HMGB1, the macroautophagy/autophagy-lysosome pathway, and DR, as well as their underlying molecular mechanisms. In brief, the relationship between high glucose (HG) and the autophagy-lysosome pathway was examined in retinal pigment epithelial (RPE) cells. The relationship was studied by detecting classical autophagic features, and siRNAs targeting HMGB1 and pharmacological regulators were used to explore the role of the autophagy-lysosome pathway in DR development. The results demonstrated that HG inhibited autophagy and diminished the degradative capacity of autophagy due to lysosome membrane permeabilization (LMP). In addition, HMGB1 was found to be involved in LMP via the CTSB (cathepsin B)-dependent pathway, but not the CTSL (cathepsin L)-dependent pathway. Knockdown of HMGB1 expression rescued LMP, restored the degradative capacity of autophagy, decreased the expression of inflammatory factors and VEGF (vascular endothelial growth factor), and protected against apoptosis in RPE cells in the early stages of DR.
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Affiliation(s)
- Lujia Feng
- Chongqing Key Lab of Ophthalmology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Eye Institute, Chongqing Branch of National Clinical Research Center for Ocular Diseases, Chongqing, P. R. China
| | - Liang Liang
- Chongqing Key Lab of Ophthalmology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Eye Institute, Chongqing Branch of National Clinical Research Center for Ocular Diseases, Chongqing, P. R. China
| | - Shaochong Zhang
- Shenzhen Key Laboratory of Ophthalmology, Ophthalmology, Shenzhen Eye Hospital, Shenzhen, Guangdong, China
| | - Jinglu Yang
- Chongqing Key Lab of Ophthalmology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Eye Institute, Chongqing Branch of National Clinical Research Center for Ocular Diseases, Chongqing, P. R. China
| | - Yanan Yue
- Chongqing Key Lab of Ophthalmology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Eye Institute, Chongqing Branch of National Clinical Research Center for Ocular Diseases, Chongqing, P. R. China
| | - Xuedong Zhang
- Chongqing Key Lab of Ophthalmology, The First Affiliated Hospital of Chongqing Medical University, Chongqing Eye Institute, Chongqing Branch of National Clinical Research Center for Ocular Diseases, Chongqing, P. R. China
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10
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Jiang M, Liu T, Zhang J, Gao S, Tao B, Cao R, Qiu Y, Liu J, Li Y, Wang Y, Cao F. Rapamycin Promotes Cardiomyocyte Differentiation of Human Induced Pluripotent Stem Cells in a Stage-Dependent Manner. Stem Cells Dev 2020; 29:1229-1239. [PMID: 32693734 DOI: 10.1089/scd.2020.0025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) are a promising source for cardiac regenerative therapy, and ideal for in vitro cell modeling of cardiovascular diseases and drug screening. Recent studies have shown that rapamycin can promote cardiomyocyte differentiation in various stem cells. However, how rapamycin affects cardiomyocyte differentiation of iPSCs is still not fully understood. This study aimed to investigate the effect of rapamycin on cardiomyocyte differentiation based on embryoid body (EB) method. First, to determine the autophagy induction protocol, different concentrations of rapamycin were applied in hEBs on day 6. The autophagy was most significant when applying rapamycin at 1 μM for 48 h, demonstrating by the LC3II/LC3I ratio and p62 expression. Then, 1 μM rapamycin was applied for 48 h at different time points of cardiomyocyte differentiation to investigate the role of rapamycin in this process. Compared with control, rapamycin applied on days 0-4 of differentiation significantly decreased the proportion of beating EBs and expression of cardiomyocyte-specific genes, while rapamycin applied on days 4-14 significantly increased them. Among all groups, rapamycin applied on days 4-6 achieved highest cardiomyocyte differentiation efficiency. Furthermore, using autophagy inhibitor NH4Cl and GSK-3β inhibitor CHIR-99021, we found rapamycin-induced autophagy promoted cardiomyocyte differentiation at middle stage by negatively regulating the Wnt/β-catenin signaling pathway. These results suggest that rapamycin regulates EB-based cardiomyocyte differentiation in a stage-dependent manner, and the negative regulation of Wnt/β-catenin signaling pathway by autophagy was involved in the prodifferentiation effect of rapamycin at middle stage.
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Affiliation(s)
- Min Jiang
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Tong Liu
- Department of Cardiology, The Affiliated Hospital of Northwest University, Xi'an No.3 Hospital, Xi'an, China
| | - Jibin Zhang
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Shan Gao
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Bo Tao
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Ruihua Cao
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Ya Qiu
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Junsong Liu
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Yanhua Li
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Yabin Wang
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
| | - Feng Cao
- Department of Cardiology & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital & Medical School of Chinese PLA, Beijing, China
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11
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Tripathi A, Thangaraj A, Chivero ET, Periyasamy P, Burkovetskaya ME, Niu F, Guo ML, Buch S. N-Acetylcysteine Reverses Antiretroviral-Mediated Microglial Activation by Attenuating Autophagy-Lysosomal Dysfunction. Front Neurol 2020; 11:840. [PMID: 33013619 PMCID: PMC7498983 DOI: 10.3389/fneur.2020.00840] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 07/06/2020] [Indexed: 01/18/2023] Open
Abstract
Successful suppression of viral replication by combined antiretroviral therapy (cART) in HIV-1 infected individuals is paradoxically also accompanied by an increased prevalence of HIV-associated neurocognitive disorders (HAND) in these individuals. HAND is characterized by a state of chronic oxidative stress and inflammation. Microglia are extremely sensitive to a plethora of stimuli, including viral proteins and cART. The current study aimed to assess the effects of cART-mediated oxidative stress on the induction of inflammatory responses in microglia. In the present study, we chose a combination of three commonly used antiretroviral drugs—tenofovir disoproxil fumarate, emtricitabine, and dolutegravir. We demonstrated that exposure of microglia to the chosen cART cocktail induced generation of reactive oxygen species, subsequently leading to lysosomal dysfunction and dysregulated autophagy, ultimately resulting in the activation of microglia. Intriguingly, the potent antioxidant, N-acetylcysteine, reversed the damaging effects of cART. These in vitro findings were further corroborated in vivo wherein cART-treated HIV transgenic (Tg) rats demonstrated increased microglial activation, exaggerated lysosome impairment, and dysregulated autophagy in the prefrontal cortices compared with HIV Tg rats not exposed to cART. Similar to in vitro findings, the treatment of HIV Tg rats with N-acetylcysteine also mitigated the deleterious effects of cART. Taken together, our findings suggest that oxidative stress-mediated lysosomal dysfunction plays a critical role in the pathogenesis of HAND in drug-treated HIV-infected individuals and that antioxidant-mediated mitigation of oxidative stress could thus be considered as an adjunctive therapeutic strategy for ameliorating/dampening some of the neurological complications of HAND.
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Affiliation(s)
- Ashutosh Tripathi
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Annadurai Thangaraj
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Ernest T Chivero
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Palsamy Periyasamy
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Maria E Burkovetskaya
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Fang Niu
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Ming-Lei Guo
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Shilpa Buch
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
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12
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Role of autophagy in regulation of cancer cell death/apoptosis during anti-cancer therapy: focus on autophagy flux blockade. Arch Pharm Res 2020; 43:475-488. [PMID: 32458284 DOI: 10.1007/s12272-020-01239-w] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 05/19/2020] [Indexed: 02/06/2023]
Abstract
Autophagy is a self-degradation process in which the cytoplasmic cargoes are delivered to the lysosomes for degradation. As the cargoes are degraded/recycled, the autophagy process maintains the cellular homeostasis. Anti-cancer therapies induce apoptosis and autophagy concomitantly, and the induced autophagy normally prevents stress responses that are being induced. In such cases, the inhibition of autophagy can be a reasonable strategy to enhance the efficacy of anti-cancer therapies. However, recent studies have shown that autophagy induced by anti-cancer drugs causes cell death/apoptosis induction, indicating a controversial role of autophagy in cancer cell survival or death/apoptosis. Therefore, in the present review, we aimed to assess the signaling mechanisms involved in autophagy and cell death/apoptosis induction during anti-cancer therapies. This review summarizes the process of autophagy, autophagy flux and its blockade, and measurement and interpretation of autophagy flux. Further, it describes the signaling pathways involved in the blockade of autophagy flux and the role of signaling molecules accumulated by autophagy blockade in cell death/apoptosis in various cancer cells during anti-cancer therapies. Altogether, it implies that factors such as types of cancer, drug therapies, and characteristics of autophagy should be evaluated before targeting autophagy for cancer treatment.
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13
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Autophagy: A Player in response to Oxidative Stress and DNA Damage. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:5692958. [PMID: 31467633 PMCID: PMC6701339 DOI: 10.1155/2019/5692958] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 05/07/2019] [Accepted: 06/10/2019] [Indexed: 12/20/2022]
Abstract
Autophagy is a catabolic pathway activated in response to different cellular stressors, such as damaged organelles, accumulation of misfolded or unfolded proteins, ER stress, accumulation of reactive oxygen species, and DNA damage. Some DNA damage sensors like FOXO3a, ATM, ATR, and p53 are known to be important autophagy regulators, and autophagy seems therefore to have a role in DNA damage response (DDR). Recent studies have partly clarified the pathways that induce autophagy during DDR, but its precise role is still not well known. Previous studies have shown that autophagy alterations induce an increase in DNA damage and in the occurrence of tumor and neurodegenerative diseases, highlighting its fundamental role in the maintenance of genomic stability. During DDR, autophagy could act as a source of energy to maintain cell cycle arrest and to sustain DNA repair activities. In addition, autophagy seems to play a role in the degradation of components involved in the repair machinery. In this paper, molecules which are able to induce oxidative stress and/or DNA damage have been selected and their toxic and genotoxic effects on the U937 cell line have been assessed in the presence of the single compounds and in concurrence with an inhibitor (chloroquine) or an inducer (rapamycin) of autophagy. Our data seem to corroborate the fundamental role of this pathway in response to direct and indirect DNA-damaging agents. The inhibition of autophagy through chloroquine had no effect on the genotoxicity induced by the tested compounds, but it led to a high increase of cytotoxicity. The induction of autophagy, through cotreatment with rapamycin, reduced the genotoxic activity of the compounds. The present study confirms the cytoprotective role of autophagy during DDR; its inhibition can sensitize cancer cells to DNA-damaging agents. The modulation of this pathway could therefore be an innovative approach able to reduce the toxicity of many compounds and to enhance the activity of others, including anticancer drugs.
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14
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Cancer and ER stress: Mutual crosstalk between autophagy, oxidative stress and inflammatory response. Biomed Pharmacother 2019; 118:109249. [PMID: 31351428 DOI: 10.1016/j.biopha.2019.109249] [Citation(s) in RCA: 243] [Impact Index Per Article: 48.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/17/2019] [Accepted: 07/18/2019] [Indexed: 12/20/2022] Open
Abstract
The endoplasmic reticulum (ER) acts as a moving organelle with many important cellular functions. As the ER lacks sufficient nutrients under pathological conditions leading to uncontrolled protein synthesis, aggregation of unfolded/misfolded proteins in the ER lumen causes the unfolded protein response (UPR) to be activated. Chronic ER stress produces endogenous or exogenous damage to cells and activates UPR, which leads to impaired intracellular calcium and redox homeostasis. The UPR is capable of recognizing the accumulation of unfolded proteins in the ER. The protein response enhances the ability of the ER to fold proteins and causes apoptosis when the function of the ER fails to return to normal. In different malignancies, ER stress can effectively induce the occurrence of autophagy in cells because malignant tumor cells need to re-use their organelles to maintain growth. Autophagy simultaneously counteracts ER stress-induced ER expansion and has the effect of enhancing cell viability and non-apoptotic death. Oxidative stress also affects mitochondrial function of important proteins through protein overload. Mitochondrial reactive oxygen species (ROS) are produced by calcium-enhanced ER release. The accumulation of toxic substances in ER and mitochondria in mitochondria destroys basic organelle function. It is known that sustained ER stress can also trigger an inflammatory response through the UPR pathway. Inflammatory response is thought to be associated with tumor development. This review discusses the emerging links between UPR responses and autophagy, oxidative stress, and inflammatory response signals in ER stress, as well as the potential development of targeting this multifaceted signaling pathway in various cancers.
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15
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Tian Y, Xin F, Jing J, Zhang X. Fluorescence imaging of lysosomal hydrogen selenide under oxygen-controlled conditions. J Mater Chem B 2019; 7:2829-2834. [PMID: 32255085 DOI: 10.1039/c8tb03169j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Hydrogen selenide (H2Se), a central metabolite of Se supplements, displays critical biological functions in many physiological and pathological processes. To better understand its comprehensive function, especially those exerted in subcellular organelles, the development of specific assays is urgently needed. However, the methodology to detect H2Se is poorly developed. Here, we present a concise design strategy to obtain an activatable fluorescent probe (Se-1) for H2Se by utilizing an intramolecular photoinduced electron transfer (PET) process to switch the fluorescence. The probe is able to selectively react with H2Se without interference from intracellular reactive species, and has been successfully used to image the H2Se content in lysosomes. Additionally, with the aid of Se-1, we demonstrated that lysosomal H2Se can be generated and can gradually accumulate in HepG2 cells under hypoxic conditions. These applications make Se-1 a potential new candidate for deciphering the biological effects of H2Se on lysosomes in biology and pathology.
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Affiliation(s)
- Yong Tian
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science of Ministry of Education, Analytical and Testing Center, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.
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16
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Zhang H, Ge S, He K, Zhao X, Wu Y, Shao Y, Wu X. FoxO1 inhibits autophagosome-lysosome fusion leading to endothelial autophagic-apoptosis in diabetes. Cardiovasc Res 2019; 115:2008-2020. [PMID: 30689742 DOI: 10.1093/cvr/cvz014] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Revised: 11/07/2018] [Accepted: 01/17/2019] [Indexed: 12/16/2022] Open
Abstract
Abstract
Aims
Inadequate autophagy contributed to endothelial dysfunction in diabetic patients. We aimed to investigate the relationship between inadequate autophagy and endothelial cells (ECs) apoptosis in diabetes and its underlying mechanism.
Methods and results
Aortic intima and ECs were isolated from diabetic patients. Cultured human aortic endothelial cells (HAECs) were stimulated with advanced glycation end products (AGEs). The expression of autophagy and apoptosis-related proteins were determined by western blotting. Autophagosomes were observed by electron microscopy. The fusion of autophagosome and lysosomes was detected by immunofluorescence. Compared with non-diabetic subjects, the levels of LC3-II, p62, FoxO1, and Ac-FoxO1 were increased in ECs from diabetic patients, accompanied by the decreased expressions of Atg14, STX17, and co-localization of LC3-II/LAMP2 and Atg14/STX17. Long-term stimulation with AGEs up-regulated LC3-II and p62 expression and the number of autophagosomes with decreased level of Atg14, STX17, Ras-related protein 7 (Rab7), and co-localization of LC3-II/LAMP2 and Atg14/STX17 in HAECs. The apoptosis rates were increased with elevated cleaved-caspase-3 and declined Bcl-2 expression. Inhibition of autophagy with 3-methyladenine could reduce long-term AGEs-induced apoptosis. Higher levels of FoxO1, Ac-FoxO1, and Ac-FoxO1 binding to Atg7 were detected in AGEs-treated HAECs. AGEs-induced FoxO1 enhanced Akt activity, decreased SIRT1-deacetylase activity by phosphorylation and elevated Ac-FoxO1. Knockout of FoxO1 reduced AGEs-induced autophagy and promoted the expression of Atg14 and the co-localization of LC3-II/LAMP 2 and Atg14/STX17.
Conclusion
Inadequate autophagy with impaired autophagosome-lysosomal fusion exists in aortic intima and ECs from diabetic patients. FoxO1 mediates AGEs-induced ECs autophagic apoptosis through impairing autophagosome-lysosomes fusion by inhibiting Atg14 expression.
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Affiliation(s)
- Hui Zhang
- Lab of Public Platform, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
| | - Song Ge
- Department of Neurology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
| | - Kesuai He
- Department of Thoracic Surgery, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
| | - Xin Zhao
- Department of Endocrinology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
| | - Ya Wu
- Department of Endocrinology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
| | - Yongfeng Shao
- Department of Thoracic Surgery, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
| | - Xiaohong Wu
- Department of Endocrinology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
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17
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Božič J, Bidovec K, Vizovišek M, Dolenc I, Stoka V. Menadione-induced apoptosis in U937 cells involves Bid cleavage and stefin B degradation. J Cell Biochem 2019; 120:10662-10669. [PMID: 30652348 DOI: 10.1002/jcb.28356] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 11/29/2018] [Indexed: 02/06/2023]
Abstract
Earlier studies showed that the oxidant menadione (MD) induces apoptosis in certain cells and also has anticancer effects. Most of these studies emphasized the role of the mitochondria in this process. However, the engagement of other organelles is less known. Particularly, the role of lysosomes and their proteolytic system, which participates in apoptotic cell death, is still unclear. The aim of this study was to investigate the role of lysosomal cathepsins on molecular signaling in MD-induced apoptosis in U937 cells. MD treatment induced translocation of cysteine cathepsins B, C, and S, and aspartic cathepsin D. Once in the cytosol, some cathepsins cleaved the proapoptotic molecule, Bid, in a process that was completely prevented by E64d, a general inhibitor of cysteine cathepsins, and partially prevented by the pancaspase inhibitor, z-VAD-fmk. Upon loss of the mitochondrial membrane potential, apoptosome activation led to caspase-9 processing, activation of caspase-3-like caspases, and poly (ADP-ribose) polymerase cleavage. Notably, the endogenous protein inhibitor, stefin B, was degraded by cathepsin D and caspases. This process was prevented by z-VAD-fmk, and partially by pepstatin A-penetratin. These findings suggest that the cleaved Bid protein acts as an amplifier of apoptotic signaling through mitochondria, thus enhancing the activity of cysteine cathepsins following stefin B degradation.
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Affiliation(s)
- Janja Božič
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia.,Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Katja Bidovec
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia.,Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Matej Vizovišek
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia
| | - Iztok Dolenc
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia
| | - Veronika Stoka
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia.,Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
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18
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Venom from the scorpion Heterometrus liangi inhibits HeLa cell proliferation by inducing p21 expression. Biologia (Bratisl) 2018. [DOI: 10.2478/s11756-018-0119-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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He Y, Meng H, Xu H, Fan L, Zhou Z, Xu B, Sun L, Gao Y. Regulation of Integrated Stress Response Sensitizes U87MG Glioblastoma Cells to Temozolomide Through the Mitochondrial Apoptosis Pathway. Anat Rec (Hoboken) 2018; 301:1390-1397. [PMID: 29698579 DOI: 10.1002/ar.23839] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 01/12/2018] [Accepted: 01/19/2018] [Indexed: 01/01/2023]
Abstract
Glioblastomas are the most frequently diagnosed and worst primary malignancy of the central nervous system, with very poor prognosis. The first-line antiglioma drug temozolomide shows decreasing therapeutic efficacy as treatment progresses. As the integrated stress response (ISR) may be a resistance factor and severe stress might transform the protective effect of the ISR into a damage effect, pharmacological regulation of ISR may be an effective way to sensitize glioma to temozolomide. The aim of the present study was to investigate the mechanisms of the ISR in regulating the therapeutic effect of temozolomide in the human glioblastoma multiforme cell line U87MG. Cultured U87MG cells were treated with temozolomide and PCR array was used to screen key factors in the response to treatment. Cells were co-treated with temozolomide and the eIF2α phosphatase inhibitor salubrinal, and cell apoptosis was measured. Combination treatment with temozolomide and salubrinal had a synergistic effect on cell viability. Salubrinal could upregulate the expression of ATF4, a key factor in the ISR, and enhance temozolomide-induced apoptosis. ATF4 transcriptionally regulated expression of the BH3-ONLY protein NOXA, thus inducing mitochondrial apoptosis. These findings suggest that ISR and ATF4 are involved in the death crosstalk between the endoplasmic reticulum and mitochondria and might be a potential target to enhance the therapeutic effect of temozolomide in patients with glioblastoma multiforme. Anat Rec, 2018. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Yichun He
- Department of Neurosurgery, China-Japan Union Hospital, Jilin University, Changchun, Jilin, China
| | - Hao Meng
- Department of Neurosurgery, The First Affiliated Hospital of Jilin University, Changchun, Jilin, China
| | - Huadan Xu
- Department of Pathophysiology, Basic College of Medicine, Jilin University, Changchun, Jilin, China
| | - Linghua Fan
- Department of Clinical Medicine, College of Clinical Medicine, Jilin University, Changchun, Jilin, China
| | - Zijian Zhou
- Department of Clinical Medicine, College of Clinical Medicine, Jilin University, Changchun, Jilin, China
| | - Bo Xu
- Department of Oncology, Drug Discovery Division, Southern Research Institute Alabama University, Alabama, USA
| | - Liankun Sun
- Department of Pathophysiology, Basic College of Medicine, Jilin University, Changchun, Jilin, China
| | - Yufei Gao
- Department of Neurosurgery, China-Japan Union Hospital, Jilin University, Changchun, Jilin, China
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20
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Fu Z, Cheng X, Kuang J, Feng H, Chen L, Liang J, Shen X, Yuen S, Peng C, Shen B, Jin Z, Qiu W. CQ sensitizes human pancreatic cancer cells to gemcitabine through the lysosomal apoptotic pathway via reactive oxygen species. Mol Oncol 2018; 12:529-544. [PMID: 29453806 PMCID: PMC5891043 DOI: 10.1002/1878-0261.12179] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/23/2018] [Accepted: 01/24/2018] [Indexed: 12/13/2022] Open
Abstract
As an established anticancer drug, gemcitabine (GEM) is an effective systemic treatment for advanced pancreatic cancer (PC). However, little is known about the potential effectors that may modify tumour cell sensitivity towards GEM. Autophagy, as a physiological cellular mechanism, is involved in both cell survival and cell death. In this study, we found that exposure to GEM induced a significant increase in autophagy in a dose-dependent manner in PANC-1 and BxPC-3 cells. Inhibition of autophagy by chloroquine (CQ) and ATG7 siRNA increased GEM-induced cytotoxicity, and CQ was more effective than ATG7 siRNA. Moreover, CQ significantly enhanced GEM-induced apoptosis, while ATG7 siRNA failed to show the similar effect. Subsequently, we identified a potential mechanism of this cooperative interaction by showing that GEM with CQ pretreatment markedly triggered reactive oxygen species (ROS) boost and then increased lysosomal membrane permeability. Consequently, cathepsins released from lysosome into the cytoplasm induced apoptosis. We showed that CQ could enhance PC cells response to GEM in xenograft models. In conclusion, our data showed that CQ sensitized PC cells to GEM through the lysosomal apoptotic pathway via ROS. Thus, CQ as a potential adjuvant to GEM might represent an attractive therapeutic strategy for PC treatment.
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Affiliation(s)
- Zhiping Fu
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Xi Cheng
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Jie Kuang
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Haoran Feng
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Lingxie Chen
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Juyong Liang
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Xiaonan Shen
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Stanley Yuen
- Biology Chemistry MajorUniversity At AlbanyNew YorkNYUSA
| | - Chenghong Peng
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Baiyong Shen
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Zhijian Jin
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Weihua Qiu
- Department of General SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
- Shanghai Institute of Digestive SurgeryRuijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
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21
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Kiprowska MJ, Stepanova A, Todaro DR, Galkin A, Haas A, Wilson SM, Figueiredo-Pereira ME. Neurotoxic mechanisms by which the USP14 inhibitor IU1 depletes ubiquitinated proteins and Tau in rat cerebral cortical neurons: Relevance to Alzheimer's disease. Biochim Biophys Acta Mol Basis Dis 2017; 1863:1157-1170. [PMID: 28372990 DOI: 10.1016/j.bbadis.2017.03.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 03/14/2017] [Accepted: 03/27/2017] [Indexed: 12/14/2022]
Abstract
In Alzheimer's disease proteasome activity is reportedly downregulated, thus increasing it could be therapeutically beneficial. The proteasome-associated deubiquitinase USP14 disassembles polyubiquitin-chains, potentially delaying proteasome-dependent protein degradation. We assessed the protective efficacy of inhibiting or downregulating USP14 in rat and mouse (Usp14axJ) neuronal cultures treated with prostaglandin J2 (PGJ2). IU1 concentrations (HIU1>25μM) reported by others to inhibit USP14 and be protective in non-neuronal cells, reduced PGJ2-induced Ub-protein accumulation in neurons. However, HIU1 alone or with PGJ2 is neurotoxic, induces calpain-dependent Tau cleavage, and decreases E1~Ub thioester levels and 26S proteasome assembly, which are energy-dependent processes. We attribute the two latter HIU1 effects to ATP-deficits and mitochondrial Complex I inhibition, as shown herein. These HIU1 effects mimic those of mitochondrial inhibitors in general, thus supporting that ATP-depletion is a major mediator of HIU1-actions. In contrast, low IU1 concentrations (LIU1≤25μM) or USP14 knockdown by siRNA in rat cortical cultures or loss of USP14 in cortical cultures from ataxia (Usp14axJ) mice, failed to prevent PGJ2-induced Ub-protein accumulation. PGJ2 alone induces Ub-protein accumulation and decreases E1~Ub thioester levels. This seemingly paradoxical result may be attributed to PGJ2 inhibiting some deubiquitinases (such as UCH-L1 but not USP14), thus triggering Ub-protein stabilization. Overall, IU1-concentrations that reduce PGJ2-induced accumulation of Ub-proteins are neurotoxic, trigger calpain-mediated Tau cleavage, lower ATP, E1~Ub thioester and E1 protein levels, and reduce proteasome activity. In conclusion, pharmacologically inhibiting (with low or high IU1 concentrations) or genetically down-regulating USP14 fail to enhance proteasomal degradation of Ub-proteins or Tau in neurons.
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Affiliation(s)
- Magdalena J Kiprowska
- Department of Biological Sciences, Hunter College, Biology and Biochemistry Programs, Graduate Center, The City University of New York, New York, NY 10065, USA
| | - Anna Stepanova
- School of Biological Sciences, Queen's University Belfast, Belfast BT9 7BL, United Kingdom; N.K. Koltzov Institute of Developmental Biology, Russian Academy of Sciences, Moscow 119334, Russia
| | - Dustin R Todaro
- Department of Biochemistry and Molecular Biology, LSU Health Sciences Center, New Orleans, LA 70112, USA
| | - Alexander Galkin
- School of Biological Sciences, Queen's University Belfast, Belfast BT9 7BL, United Kingdom; Feil Family Brain and Mind Research Institute, Weill Cornell Medical College, New York, NY 10065, USA
| | - Arthur Haas
- Department of Biochemistry and Molecular Biology, LSU Health Sciences Center, New Orleans, LA 70112, USA
| | - Scott M Wilson
- Department of Neurobiology, Civitan International Research Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Maria E Figueiredo-Pereira
- Department of Biological Sciences, Hunter College, Biology and Biochemistry Programs, Graduate Center, The City University of New York, New York, NY 10065, USA.
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22
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Chechushkov A, Zaitseva N, Vorontsova E, Kozhin P, Menshchikova E, Shkurupiy V. Dextran loading protects macrophages from lipid peroxidation and induces a Keap1/Nrf2/ARE-dependent antioxidant response. Life Sci 2016; 166:100-107. [PMID: 27746187 DOI: 10.1016/j.lfs.2016.10.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 09/28/2016] [Accepted: 10/12/2016] [Indexed: 01/13/2023]
Abstract
AIMS Linear dextrans are often proposed as drug delivery systems with milder adverse effects and lower effective drug concentrations. Linear dextrans are polysaccharides that can potentially be used to load macrophages with drugs to transport them to a site of inflammation. Recently, it was reported that dextrans may exert a protective effect vis-à-vis drug cytotoxicity and during wound healing. The aim of the current work was to evaluate molecular mechanisms of action of dextrans that may be relevant to the cytoprotective effects. MAIN METHODS We determined the effect of treatment with 40- or 70-kDa dextran on production of reactive oxygen species, lipid peroxidation, and lysosomal pH in the J774 macrophage cell line. In addition, induction of Keap1/Nrf2/ARE and autophagic activity were evaluated. KEY FINDINGS Dextrans of both molecular weights protected the cells from oxidative stress induced by cumene hydroperoxide and from lysosomal stress induced by ammonium chloride. The effect was associated with induction of the Keap1/Nrf2/ARE signaling pathway. Furthermore, dextran stimulated autophagy in a dose-dependent manner but inhibited the autophagosome-lysosome fusion in a time-dependent manner. SIGNIFICANCE This study shows possible cytoprotective effects of dextran under oxidative stress, and these findings may be used for the development of novel (dextran-based) drug delivery approaches.
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Affiliation(s)
- Anton Chechushkov
- Research Institute of Experimental and Clinical Medicine, Novosibirsk, Russia.
| | - Natalia Zaitseva
- Research Institute of Experimental and Clinical Medicine, Novosibirsk, Russia
| | - Elena Vorontsova
- Institute of Molecular Biology and Biophysics, Novosibirsk, Russia
| | - Petr Kozhin
- Research Institute of Experimental and Clinical Medicine, Novosibirsk, Russia
| | - Elena Menshchikova
- Research Institute of Experimental and Clinical Medicine, Novosibirsk, Russia
| | - Vyacheslav Shkurupiy
- Research Institute of Experimental and Clinical Medicine, Novosibirsk, Russia; Novosibirsk State Medical University, Novosibirsk, Russia
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Venkatesan T, Choi YW, Mun SP, Kim YK. Pinus radiata bark extract induces caspase-independent apoptosis-like cell death in MCF-7 human breast cancer cells. Cell Biol Toxicol 2016; 32:451-64. [PMID: 27400986 DOI: 10.1007/s10565-016-9346-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 06/28/2016] [Indexed: 01/13/2023]
Abstract
In the present study, we investigated the anticancer activity of Pinus radiata bark extract (PRE) against MCF-7 human breast cancer cells. First, we observed that PRE induces potent cytotoxic effects in MCF-7 cells. The cell death had features of cytoplasmic vacuolation, plasma membrane permeabilization, chromatin condensation, phosphatidylserine externalization, absence of executioner caspase activation, insensitivity to z-VAD-fmk (caspase inhibitor), increased accumulation of autophagic markers, and lysosomal membrane permeabilization (LMP). Both the inhibition of early stage autophagy flux and lysosomal cathepsins did not improve cell viability. The antioxidant, n-acetylcysteine, and the iron chelator, deferoxamine, failed to restore the lysosomal integrity indicating that PRE-induced LMP is independent of oxidative stress. This was corroborated with the absence of enhanced ROS production in PRE-treated cells. Chelation of both intracellular calcium and zinc promotes PRE-induced LMP. Geranylgeranylacetone, an inducer of Hsp70 expression, also had no significant protective effect on PRE-induced LMP. Moreover, we found that PRE induces endoplasmic reticulum (ER) stress and mitochondrial membrane depolarization in MCF-7 cells. The ER stress inhibitor, 4-PBA, did not restore the mitochondrial membrane integrity, whereas cathepsin inhibitors demonstrated significant protective effects. Collectively, our results suggest that PRE induces an autophagic block, LMP, ER stress, and mitochondrial dysfunction in MCF-7 cells. However, further studies are clearly warranted to explore the exact mechanism behind the anticancer activity of PRE in MCF-7 human breast cancer cells.
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Affiliation(s)
- Thamizhiniyan Venkatesan
- Department of Forest Products and Biotechnology, College of Forest Science, Kookmin University, 861-1 Chongnung-dong, Songbuk-gu, Seoul, 136-702, South Korea
| | - Young-Woong Choi
- Department of Forest Products and Biotechnology, College of Forest Science, Kookmin University, 861-1 Chongnung-dong, Songbuk-gu, Seoul, 136-702, South Korea
| | - Sung-Phil Mun
- Department of Wood Science and Technology, College of Agriculture and Life Science, Chonbuk National University, Jeonju, 561-756, South Korea
| | - Young-Kyoon Kim
- Department of Forest Products and Biotechnology, College of Forest Science, Kookmin University, 861-1 Chongnung-dong, Songbuk-gu, Seoul, 136-702, South Korea.
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24
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Effect of GTP-binding protein (YPT1 protein) on the enhanced yeast vacuolar activity. Mol Cell Biochem 2016; 414:179-86. [DOI: 10.1007/s11010-016-2670-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 02/13/2016] [Indexed: 10/22/2022]
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25
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Manifestations of oxidative stress and molecular damages in ovarian cancer tissue. UKRAINIAN BIOCHEMICAL JOURNAL 2015. [DOI: 10.15407/ubj87.05.093] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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26
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Sudo R, Sato F, Azechi T, Wachi H. 7-Ketocholesterol-induced lysosomal dysfunction exacerbates vascular smooth muscle cell calcification via oxidative stress. Genes Cells 2015; 20:982-91. [PMID: 26419830 DOI: 10.1111/gtc.12301] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2015] [Accepted: 08/20/2015] [Indexed: 11/29/2022]
Abstract
Vascular calcification is known to reduce the elasticity of aorta. Several studies have suggested that autophagy-lysosomal pathway (ALP) in vascular smooth muscle cells (VSMCs) is associated with vascular calcification. A major component of oxidized low-density lipoproteins, 7-ketocholesterol (7-KC), has been reported to promote inorganic phosphorus (Pi)-induced vascular calcification and induce ALP. The aim of this study was to unravel the relationship between ALP and the progression of calcification by 7-KC. Calcification of human VSMCs was induced by Pi stimulation in the presence or absence of 7-KC. FACS analysis showed that 7-KC-induced apoptosis at a high concentration (30 μM), but not at a low concentration (15 μM). Interestingly, 7-KC promoted calcification in VSMCs regardless of apoptosis. Immunoblotting and immunostaining showed that 7-KC inhibits not only the fusion of autophagosomes and lysosomes but also causes a swell of lysosomes with the reduction of cathepsin B and D. Moreover, lysosomal protease inhibitors exacerbated the apoptosis-independent calcification by 7-KC although inhibition of autophagosome formation by Atg5 siRNA did not. Finally, the 7-KC-induced progression of calcification was alleviated by the treatment with antioxidant. Taken together, our data showed that 7-KC promotes VSMC calcification through lysosomal-dysfunction-dependent oxidative stress.
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Affiliation(s)
- Ryo Sudo
- Department of Tissue Regeneration, Hoshi University School of Pharmacy and Pharmaceutical Sciences, 2-4-41 Ebara, Shinagawa-ku, Tokyo, 142-8501, Japan
| | - Fumiaki Sato
- Department of Analytical Pathophysiology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, 2-4-41 Ebara, Shinagawa-ku, Tokyo, 142-8501, Japan
| | - Takuya Azechi
- Department of Tissue Regeneration, Hoshi University School of Pharmacy and Pharmaceutical Sciences, 2-4-41 Ebara, Shinagawa-ku, Tokyo, 142-8501, Japan
| | - Hiroshi Wachi
- Department of Tissue Regeneration, Hoshi University School of Pharmacy and Pharmaceutical Sciences, 2-4-41 Ebara, Shinagawa-ku, Tokyo, 142-8501, Japan
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27
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Ma L, Xu Y, Su J, Yu H, Kang J, Li H, Li X, Xie Q, Yu C, Sun L, Li Y. Autophagic flux promotes cisplatin resistance in human ovarian carcinoma cells through ATP-mediated lysosomal function. Int J Oncol 2015; 47:1890-900. [PMID: 26397057 DOI: 10.3892/ijo.2015.3176] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 08/18/2015] [Indexed: 11/05/2022] Open
Abstract
Lysosomes are involved in promoting resistance of cancer cells to chemotherapeutic agents. However, the mechanisms underlying lysosomal influence of cisplatin resistance in ovarian cancer remain incompletely understood. We report that, compared with cisplatin-sensitive SKOV3 cells, autophagy increases in cisplatin-resistant SKOV3/DDP cells treated with cisplatin. Inhibition of early-stage autophagy enhanced cisplatin-mediated cytotoxicity in SKOV3/DDP cells, but autophagy inhibition at a later stage by disturbing autophagosome-lysosome fusion is more effective. Notably, SKOV3/DDP cells contained more lysosomes than cisplatin-sensitive SKOV3 cells. Abundant lysosomes and lysosomal cathepsin D activity were required for continued autolysosomal degradation and maintenance of autophagic flux in SKOV3/DDP cells. Furthermore, SKOV3/DDP cells contain abundant lysosomal ATP required for lysosomal function, and inhibition of lysosomal ATP accumulation impaired lysosomal function and blocked autophagic flux. Therefore, our findings suggest that lysosomes at least partially contribute to cisplatin resistance in ovarian cancer cells through their role in cisplatin-induced autophagic processes, and provide insight into the mechanism of cisplatin resistance in tumors.
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Affiliation(s)
- Liwei Ma
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Ye Xu
- Medical Research Lab, Jilin Medical University, Changchun, Jilin 132013, P.R. China
| | - Jing Su
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Huimei Yu
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Jinsong Kang
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Hongyan Li
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Xiaoning Li
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Qi Xie
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Chunyan Yu
- Department of Pathology, Basic Medical College, BeiHua University, Changchun, Jilin 132013, P.R. China
| | - Liankun Sun
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yang Li
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021, P.R. China
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28
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Liu WJ, Shen TT, Chen RH, Wu HL, Wang YJ, Deng JK, Chen QH, Pan Q, Huang Fu CM, Tao JL, Liang D, Liu HF. Autophagy-Lysosome Pathway in Renal Tubular Epithelial Cells Is Disrupted by Advanced Glycation End Products in Diabetic Nephropathy. J Biol Chem 2015; 290:20499-510. [PMID: 26100632 DOI: 10.1074/jbc.m115.666354] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Indexed: 12/16/2022] Open
Abstract
It has been suggested that autophagy protects renal tubular epithelial cells (TECs) from injury in diabetic nephropathy (DN). However, the manner in which the autophagy-lysosome pathway is changed in this state remains unclear. In this study of DN, we investigated the autophagic activity and lysosomal alterations in vivo and in vitro. We found that autophagic vacuoles and SQSTM1-positive proteins accumulated in TECs from patients with DN and in human renal tubular epithelial cell line (HK-2 cells) treated with advanced glycation end products (AGEs), the important factors that involved in the pathogenesis of DN. In HK-2 cells, exposure to AGEs caused a significant increase in autophagosomes but a marked decrease in autolysosomes, and the lysosomal turnover of LC3-II was not observed, although LC3-II puncta were co-localized with the irregular lysosomal-associated membrane protein1 granules after AGEs treatment. Furthermore, lysosomal membrane permeabilization was triggered by AGEs, which likely resulted in a decrease in the enzymatic activities of cathepsin B and cathepsin L, the defective acidification of lysosomes, and suppression of the lysosomal degradation of DQ-ovalbumin. Oxidative stress evoked by AGEs-receptor for AGE interaction likely played an important role in the lysosomal dysfunction. Additionally, ubiquitinated proteins were co-localized with SQSTM1-positive puncta and accumulated in HK-2 cells after exposure to AGEs, indicating blocked degradation of SQSTM1-positive and ubiquitinated aggregates. Taken together, the results show that lysosomal membrane permeabilization and lysosomal dysfunction are triggered by AGEs, which induce autophagic inactivation in TECs from patients with DN. Disruption of the autophagy-lysosome pathway should be focused when studying the mechanisms underlying DN.
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Affiliation(s)
- Wei Jing Liu
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Ting Ting Shen
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Rui Hong Chen
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Hong-Luan Wu
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Yan Jin Wang
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Jian Kun Deng
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Qiu Hua Chen
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Qingjun Pan
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Chang-mei Huang Fu
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Jing-li Tao
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Dong Liang
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Hua-feng Liu
- From the Institute of Nephrology, Guangdong Medical College, Zhanjiang, Guangdong 524001, China
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29
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Jung ES, Hong H, Kim C, Mook-Jung I. Acute ER stress regulates amyloid precursor protein processing through ubiquitin-dependent degradation. Sci Rep 2015; 5:8805. [PMID: 25740315 PMCID: PMC5390087 DOI: 10.1038/srep08805] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 02/05/2015] [Indexed: 12/15/2022] Open
Abstract
Beta-amyloid (Aβ), a major pathological hallmark of Alzheimer's disease (AD), is derived from amyloid precursor protein (APP) through sequential cleavage by β-secretase and γ-secretase enzymes. APP is an integral membrane protein, and plays a key role in the pathogenesis of AD; however, the biological function of APP is still unclear. The present study shows that APP is rapidly degraded by the ubiquitin-proteasome system (UPS) in the CHO cell line in response to endoplasmic reticulum (ER) stress, such as calcium ionophore, A23187, induced calcium influx. Increased levels of intracellular calcium by A23187 induces polyubiquitination of APP, causing its degradation. A23187-induced reduction of APP is prevented by the proteasome inhibitor MG132. Furthermore, an increase in levels of the endoplasmic reticulum-associated degradation (ERAD) marker, E3 ubiquitin ligase HRD1, proteasome activity, and decreased levels of the deubiquitinating enzyme USP25 were observed during ER stress. In addition, we found that APP interacts with USP25. These findings suggest that acute ER stress induces degradation of full-length APP via the ubiquitin-proteasome proteolytic pathway.
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Affiliation(s)
- Eun Sun Jung
- Department of Biochemistry &Biomedical Science, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - HyunSeok Hong
- Medifron DBT, Inc., Gyeongi, 425-838, Republic of Korea
| | - Chaeyoung Kim
- Department of Biochemistry &Biomedical Science, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
| | - Inhee Mook-Jung
- Department of Biochemistry &Biomedical Science, Seoul National University College of Medicine, Seoul, 110-799, Republic of Korea
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30
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Xu DG, Lv W, Dai CY, Zhu FF, Xu GH, Ma ZJ, Chen Z. 2-(Pro-1-ynyl)-5-(5,6-dihydroxypenta-1,3-diynyl) thiophene induces apoptosis through reactive oxygen species-mediated JNK activation in human colon cancer SW620 cells. Anat Rec (Hoboken) 2014; 298:376-85. [PMID: 25178491 DOI: 10.1002/ar.23045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 08/02/2014] [Indexed: 12/20/2022]
Abstract
2-(Pro-1-ynyl)-5-(5,6-dihydroxypenta-1,3-diynyl) thiophene (PYDDT) is a naturally occurring thiophene isolated from the roots of Echinops grijsii, a Chinese herbal medicine used to treat colon cancer, breast cancer, and lung cancer. There are many reports on the clinical use of Echinops grijsii alone or in combination with other herbs to treat malignant tumors. We previously reported that the expression and activity of phase II enzymes including GSTs and NQO1 could be induced through the activation of Keap1-Nrf2 pathway by the treatment of PYDDT. In this study, we reported the anticancer effect and mechanism of PYDDT against human colon cancer SW620 cells. Our results demonstrate that treatment of SW620 cells with PYDDT leads to induction of mitochondrial-mediated apoptosis, which is characterized by the cleavage of PARP, activation of caspase 9 and caspase 3, release of cytochrome c from mitochondria, loss of mitochondrial membrane potential, down-regulation of Bcl-2, and mitochondrial translocation of Bax. The PYDDT treatment caused the production of reactive oxygen species (ROS), and the activation of JNK but not p38 mitogen-activated protein kinases and ERK1/2. Specific JNK inhibitor SP600125 prevented the PYDDT-induced down-regulation of Bcl-2, mitochondrial translocation of Bax, activation of caspase 3, and apoptosis of SW620 cells. Moreover, PYDDT-induced apoptosis as well as activation of JNK was abrogated by the pretreatment with antioxidant N-acetylcysteine. Taken together, these findings suggest that PYDDT induces apoptosis in SW620 cells through a ROS/JNK-mediated mitochondrial pathway.
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Affiliation(s)
- Dao Gun Xu
- Department of Colorectal Surgery, Wenling Hospital of Traditional Chinese Medicine, Zhejiang Chinese Medical University, Wenling, China
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31
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Yang X, Xiang X, Xia M, Su J, Wu Y, Shen L, Xu Y, Sun L. Inhibition of JNK3 Promotes Apoptosis Induced by BH3 Mimetic S1 in Chemoresistant Human Ovarian Cancer Cells. Anat Rec (Hoboken) 2014; 298:386-95. [DOI: 10.1002/ar.22991] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 05/24/2014] [Accepted: 05/29/2014] [Indexed: 01/19/2023]
Affiliation(s)
- Xiaochun Yang
- Department of Pathophysiology, Basic College of Medicine; Jilin University; Changchun 130021 People's Republic of China
| | - Xiyan Xiang
- Department of Pathophysiology, Basic College of Medicine; Jilin University; Changchun 130021 People's Republic of China
| | - Meihui Xia
- Department of Obstetrics and Gynecology, First Hospital; Jilin University; Changchun 130021 People's Republic of China
| | - Jing Su
- Department of Pathophysiology, Basic College of Medicine; Jilin University; Changchun 130021 People's Republic of China
| | - Yao Wu
- Department of Pathophysiology, Basic College of Medicine; Jilin University; Changchun 130021 People's Republic of China
| | - Luyan Shen
- Department of Pathophysiology, Basic College of Medicine; Jilin University; Changchun 130021 People's Republic of China
| | - Ye Xu
- Medical Research Laboratory; Jilin Medical College; Jilin 132013 People's Republic of China
- Department of Histology and Embryology; Jilin Medical College; Jilin 132013 People's Republic of China
| | - Liankun Sun
- Department of Pathophysiology, Basic College of Medicine; Jilin University; Changchun 130021 People's Republic of China
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32
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Xu Y, Wang N, Ding Y, Wang C, Yu Y, Liu S, Wang X, Li Z. Ammonium chloride enhances cisplatin cytotoxicity through DNA double-strand breaks in human cervical cancer cells. Oncol Rep 2013; 30:1195-200. [PMID: 23783842 DOI: 10.3892/or.2013.2554] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Accepted: 05/20/2013] [Indexed: 11/06/2022] Open
Abstract
Cisplatin (cis-diamminedichloroplatinum II, CDDP) acts as a therapeutic agent by initiating cellular apoptosis. However, side-effects and drug resistance limit the clinical use of cisplatin. Numerous studies have focused on the drug-target interactions, cellular pharmacology and pharmacokinetics of cisplatin. Newly developed treatment strategies are needed in order to be used in combination with cisplatin, with the aim to minimize toxicity and to circumvent cisplatin resistance. Ammonium chloride (NH4Cl) is widely used in various areas, but its use as a combination agent with cisplatin for the treatment of cancer cells has not been previously reported. In the present study, we showed that NH4Cl could be potentially used as an effective agent in cisplatin combination treatment of HeLa human cervical cancer (HCC) cells. Cisplatin was found to inhibit cell growth, as well as to induce cell apoptosis and DNA double-strand breaks. In addition, treatment with NH4Cl increased the rate of cell apoptosis and the activation of caspase-3. Particularly, we found that NH4Cl treatment increased cisplatin‑induced phosphorylation of H2AX. In conclusion, our data indicate that NH4Cl enhances cisplatin cytotoxicity through increased DNA damage in HeLa HCC cells.
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Affiliation(s)
- Ye Xu
- Medical Research Laboratory, Jilin Medical College, Jilin 132013, P.R. China
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