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Butler D, Reyes DR. Heart-on-a-chip systems: disease modeling and drug screening applications. LAB ON A CHIP 2024; 24:1494-1528. [PMID: 38318723 DOI: 10.1039/d3lc00829k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Cardiovascular disease (CVD) is the leading cause of death worldwide, casting a substantial economic footprint and burdening the global healthcare system. Historically, pre-clinical CVD modeling and therapeutic screening have been performed using animal models. Unfortunately, animal models oftentimes fail to adequately mimic human physiology, leading to a poor translation of therapeutics from pre-clinical trials to consumers. Even those that make it to market can be removed due to unforeseen side effects. As such, there exists a clinical, technological, and economical need for systems that faithfully capture human (patho)physiology for modeling CVD, assessing cardiotoxicity, and evaluating drug efficacy. Heart-on-a-chip (HoC) systems are a part of the broader organ-on-a-chip paradigm that leverages microfluidics, tissue engineering, microfabrication, electronics, and gene editing to create human-relevant models for studying disease, drug-induced side effects, and therapeutic efficacy. These compact systems can be capable of real-time measurements and on-demand characterization of tissue behavior and could revolutionize the drug development process. In this review, we highlight the key components that comprise a HoC system followed by a review of contemporary reports of their use in disease modeling, drug toxicity and efficacy assessment, and as part of multi-organ-on-a-chip platforms. We also discuss future perspectives and challenges facing the field, including a discussion on the role that standardization is expected to play in accelerating the widespread adoption of these platforms.
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Affiliation(s)
- Derrick Butler
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | - Darwin R Reyes
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
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2
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Dugbartey GJ, Juriasingani S, Richard-Mohamed M, Rasmussen A, Levine M, Liu W, Haig A, Whiteman M, Arp J, Luke PP, Sener A. Static Cold Storage with Mitochondria-Targeted Hydrogen Sulfide Donor Improves Renal Graft Function in an Ex Vivo Porcine Model of Controlled Donation-after-Cardiac-Death Kidney Transplantation. Int J Mol Sci 2023; 24:14017. [PMID: 37762319 PMCID: PMC10530714 DOI: 10.3390/ijms241814017] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 09/07/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
The global donor kidney shortage crisis has necessitated the use of suboptimal kidneys from donors-after-cardiac-death (DCD). Using an ex vivo porcine model of DCD kidney transplantation, the present study investigates whether the addition of hydrogen sulfide donor, AP39, to University of Wisconsin (UW) solution improves graft quality. Renal pedicles of male pigs were clamped in situ for 30 min and the ureters and arteries were cannulated to mimic DCD. Next, both donor kidneys were nephrectomized and preserved by static cold storage in UW solution with or without AP39 (200 nM) at 4 °C for 4 h followed by reperfusion with stressed autologous blood for 4 h at 37 °C using ex vivo pulsatile perfusion apparatus. Urine and arterial blood samples were collected hourly during reperfusion. After 4 h of reperfusion, kidneys were collected for histopathological analysis. Compared to the UW-only group, UW+AP39 group showed significantly higher pO2 (p < 0.01) and tissue oxygenation (p < 0.05). Also, there were significant increases in urine production and blood flow rate, and reduced levels of urine protein, serum creatinine, blood urea nitrogen, plasma Na+ and K+, as well as reduced intrarenal resistance in the UW+AP39 group compared to the UW-only group. Histologically, AP39 preserved renal structure by reducing the apoptosis of renal tubular cells and immune cell infiltration. Our finding could lay the foundation for improved graft preservation and reduce the increasingly poor outcomes associated with DCD kidney transplantation.
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Affiliation(s)
- George J. Dugbartey
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada (J.A.)
- Department of Surgery, Division of Urology, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada
- Multi-Organ Transplant Program, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada;
- Physiology & Pharmacology Department, Accra College of Medicine, Accra P.O. Box CT 9828, Ghana
- Department of Pharmacology and Toxicology, School of Pharmacy, College of Health Sciences, University of Ghana, Legon, Accra P.O. Box LG43, Ghana
| | - Smriti Juriasingani
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada (J.A.)
- Department of Microbiology & Immunology, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Mahms Richard-Mohamed
- Multi-Organ Transplant Program, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada;
| | - Andrew Rasmussen
- Department of Surgery, Division of Urology, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada
- Multi-Organ Transplant Program, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada;
| | - Max Levine
- Department of Surgery, Division of Urology, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada
- Multi-Organ Transplant Program, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada;
| | - Winnie Liu
- Department of Pathology & Laboratory Medicine, Western University, London, ON N6A 5C1, Canada
| | - Aaron Haig
- Department of Pathology & Laboratory Medicine, Western University, London, ON N6A 5C1, Canada
| | - Matthew Whiteman
- St. Luke’s Campus, University of Exeter Medical School, Exeter EX1 2HZ, UK
| | - Jacqueline Arp
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada (J.A.)
| | - Patrick P.W. Luke
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada (J.A.)
- Department of Surgery, Division of Urology, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada
- Multi-Organ Transplant Program, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada;
| | - Alp Sener
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada (J.A.)
- Department of Surgery, Division of Urology, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada
- Multi-Organ Transplant Program, London Health Sciences Center, Western University, London, ON N6A 5C1, Canada;
- Physiology & Pharmacology Department, Accra College of Medicine, Accra P.O. Box CT 9828, Ghana
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Alwadei N, Rashid M, Chandrashekar DV, Rahighi S, Totonchy J, Sharma A, Mehvar R. Generation and Characterization of CYP2E1-Overexpressing HepG2 Cells to Study the Role of CYP2E1 in Hepatic Hypoxia-Reoxygenation Injury. Int J Mol Sci 2023; 24:ijms24098121. [PMID: 37175827 PMCID: PMC10179595 DOI: 10.3390/ijms24098121] [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: 03/24/2023] [Revised: 04/24/2023] [Accepted: 04/28/2023] [Indexed: 05/15/2023] Open
Abstract
The mechanisms of hepatic ischemia/reperfusion (I/R) injury, which occurs during liver transplantation or surgery, are poorly understood. The purpose of the current study was to generate and characterize a HepG2 cell line with a stable overexpression of CYP2E1 to investigate the role of the enzyme in hypoxia/reperfusion (H/R) injury in an ex vivo setting. GFP-tagged CYP2E1 and control clones were developed, and their gene expression and protein levels of GFP and CYP2E1 were determined using RT-PCR and ELISA/Western blot analysis, respectively. Additionally, the CYP2E1 catalytic activity was determined by UPLC-MS/MS analysis of 6-hydroxychlorzoxazone formed from the chlorzoxazone substrate. The CYP2E1 and control clones were subjected to hypoxia (10 h) and reoxygenation (0.5 h), and cell death and reactive oxygen species (ROS) generation were quantitated using LDH and flow cytometry, respectively. Compared with the control clone, the selected CYP2E1 clone showed a 720-fold increase in CYP2E1 expression and a prominent band in the western blot analysis, which was associated with a 150-fold increase in CYP2E1 catalytic activity. The CYP2E1 clone produced 2.3-fold more ROS and 1.9-fold more cell death in the H/R model. It is concluded that the constitutive CYP2E1 in the liver may play a detrimental role in hepatic I/R injury.
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Affiliation(s)
- Nouf Alwadei
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA
| | - Mamunur Rashid
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA
| | | | - Simin Rahighi
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA
| | - Jennifer Totonchy
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA
| | - Ajay Sharma
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA
| | - Reza Mehvar
- Department of Biomedical and Pharmaceutical Sciences, School of Pharmacy, Chapman University, Irvine, CA 92618, USA
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Dumbali SP, Wenzel PL. Mitochondrial Permeability Transition in Stem Cells, Development, and Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1409:1-22. [PMID: 35739412 DOI: 10.1007/5584_2022_720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The mitochondrial permeability transition (mPT) is a process that permits rapid exchange of small molecules across the inner mitochondrial membrane (IMM) and thus plays a vital role in mitochondrial function and cellular signaling. Formation of the pore that mediates this flux is well-documented in injury and disease but its regulation has also emerged as critical to the fate of stem cells during embryonic development. The precise molecular composition of the mPTP has been enigmatic, with far more genetic studies eliminating molecular candidates than confirming them. Rigorous studies in the recent decade have implicated central involvement of the F1Fo ATP synthase, or complex V of the electron transport chain, and continue to confirm a regulatory role for Cyclophilin D (CypD), encoded by Ppif, in modulating the sensitivity of the pore to opening. A host of endogenous molecules have been shown to trigger flux characteristic of mPT, including positive regulators such as calcium ions, reactive oxygen species, inorganic phosphate, and fatty acids. Conductance of the pore has been described as low or high, and reversibility of pore opening appears to correspond with the relative abundance of negative regulators of mPT such as adenine nucleotides, hydrogen ion, and divalent cations that compete for calcium-binding sites in the mPTP. Current models suggest that distinct pores could be responsible for differing reversibility and conductance depending upon cellular context. Indeed, irreversible propagation of mPT inevitably leads to collapse of transmembrane potential, arrest of ATP synthesis, mitochondrial swelling, and cell death. Future studies should clarify ambiguities in mPTP structure and reveal new roles for mPT in dictating specialized cellular functions beyond cell survival that are tied to mitochondrial fitness including stem cell self-renewal and fate. The focus of this review is to describe contemporary models of the mPTP and highlight how pore activity impacts stem cells and development.
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Affiliation(s)
- Sandeep P Dumbali
- Department of Integrative Biology & Pharmacology, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Pamela L Wenzel
- Department of Integrative Biology & Pharmacology, The University of Texas Health Science Center at Houston, Houston, TX, USA.
- Center for Stem Cell and Regenerative Medicine, Brown Foundation Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, TX, USA.
- Immunology Program, The University of Texas MD Anderson UTHealth Graduate School of Biomedical Sciences, Houston, TX, USA.
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5
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Kim JS, Chapman WC, Lin Y. Mitochondrial Autophagy in Ischemic Aged Livers. Cells 2022; 11:cells11244083. [PMID: 36552847 PMCID: PMC9816943 DOI: 10.3390/cells11244083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 12/09/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
Mitochondrial autophagy (mitophagy) is a central catabolic event for mitochondrial quality control. Defective or insufficient mitophagy, thus, can result in mitochondrial dysfunction, and ultimately cell death. There is a strong causal relationship between ischemia/reperfusion (I/R) injury and mitochondrial dysfunction following liver resection and transplantation. Compared to young patients, elderly patients poorly tolerate I/R injury. Accumulation of abnormal mitochondria after I/R is more prominent in aged livers than in young counterparts. This review highlights how altered autophagy is mechanistically involved in age-dependent hypersensitivity to reperfusion injury.
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Affiliation(s)
- Jae-Sung Kim
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (W.C.C.); (Y.L.)
- Department of Cell Biology & Physiology, Washington University in St. Louis, St. Louis, MO 63110, USA
- Correspondence:
| | - William C. Chapman
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (W.C.C.); (Y.L.)
| | - Yiing Lin
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (W.C.C.); (Y.L.)
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Patel PM, Connolly MR, Coe TM, Calhoun A, Pollok F, Markmann JF, Burdorf L, Azimzadeh A, Madsen JC, Pierson RN. Minimizing Ischemia Reperfusion Injury in Xenotransplantation. Front Immunol 2021; 12:681504. [PMID: 34566955 PMCID: PMC8458821 DOI: 10.3389/fimmu.2021.681504] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 08/12/2021] [Indexed: 12/21/2022] Open
Abstract
The recent dramatic advances in preventing "initial xenograft dysfunction" in pig-to-non-human primate heart transplantation achieved by minimizing ischemia suggests that ischemia reperfusion injury (IRI) plays an important role in cardiac xenotransplantation. Here we review the molecular, cellular, and immune mechanisms that characterize IRI and associated "primary graft dysfunction" in allotransplantation and consider how they correspond with "xeno-associated" injury mechanisms. Based on this analysis, we describe potential genetic modifications as well as novel technical strategies that may minimize IRI for heart and other organ xenografts and which could facilitate safe and effective clinical xenotransplantation.
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Affiliation(s)
- Parth M. Patel
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Margaret R. Connolly
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Taylor M. Coe
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Anthony Calhoun
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Surgery, Division of Cardiac Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Franziska Pollok
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Anesthesiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany
| | - James F. Markmann
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Surgery, Division of Transplantation, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Lars Burdorf
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Surgery, Division of Cardiac Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Agnes Azimzadeh
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Surgery, Division of Cardiac Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Joren C. Madsen
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Surgery, Division of Cardiac Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Richard N. Pierson
- Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Surgery, Division of Cardiac Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
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Flores-Toro J, Chun SK, Shin JK, Campbell J, Lichtenberger M, Chapman W, Zendejas I, Behrns K, Leeuwenburgh C, Kim JS. Critical Roles of Calpastatin in Ischemia/Reperfusion Injury in Aged Livers. Cells 2021; 10:1863. [PMID: 34440632 PMCID: PMC8394464 DOI: 10.3390/cells10081863] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/16/2021] [Accepted: 07/18/2021] [Indexed: 12/02/2022] Open
Abstract
Ischemia/reperfusion (I/R) injury unavoidably occurs during hepatic resection and transplantation. Aged livers poorly tolerate I/R during surgical treatment. Although livers have a powerful endogenous inhibitor of calpains, calpastatin (CAST), I/R activates calpains, leading to impaired autophagy, mitochondrial dysfunction, and hepatocyte death. It is unknown how I/R in aged livers affects CAST. Human and mouse liver biopsies at different ages were collected during in vivo I/R. Hepatocytes were isolated from 3-month- (young) and 26-month-old (aged) mice, and challenged with short in vitro simulated I/R. Cell death, protein expression, autophagy, and mitochondrial permeability transition (MPT) between the two age groups were compared. Adenoviral vector was used to overexpress CAST. Significant cell death was observed only in reperfused aged hepatocytes. Before the commencement of ischemia, CAST expression in aged human and mouse livers and mouse hepatocytes was markedly greater than that in young counterparts. However, reperfusion substantially decreased CAST in aged human and mouse livers. In hepatocytes, reperfusion rapidly depleted aged cells of CAST, cleaved autophagy-related protein 5 (ATG5), and induced defective autophagy and MPT onset, all of which were blocked by CAST overexpression. Furthermore, mitochondrial morphology was shifted toward an elongated shape with CAST overexpression. In conclusion, CAST in aged livers is intrinsically short-lived and lost after short I/R. CAST depletion contributes to age-dependent liver injury after I/R.
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Affiliation(s)
- Joseph Flores-Toro
- Department of Surgery, University of Florida, Gainesville, FL 32610, USA; (J.F.-T.); (S.-K.C.); (I.Z.); (K.B.)
| | - Sung-Kook Chun
- Department of Surgery, University of Florida, Gainesville, FL 32610, USA; (J.F.-T.); (S.-K.C.); (I.Z.); (K.B.)
| | - Jun-Kyu Shin
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (J.-K.S.); (J.C.); (M.L.); (W.C.)
| | - Joan Campbell
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (J.-K.S.); (J.C.); (M.L.); (W.C.)
| | - Melissa Lichtenberger
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (J.-K.S.); (J.C.); (M.L.); (W.C.)
| | - William Chapman
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (J.-K.S.); (J.C.); (M.L.); (W.C.)
| | - Ivan Zendejas
- Department of Surgery, University of Florida, Gainesville, FL 32610, USA; (J.F.-T.); (S.-K.C.); (I.Z.); (K.B.)
| | - Kevin Behrns
- Department of Surgery, University of Florida, Gainesville, FL 32610, USA; (J.F.-T.); (S.-K.C.); (I.Z.); (K.B.)
| | - Christiaan Leeuwenburgh
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL 32610, USA;
| | - Jae-Sung Kim
- Department of Surgery, University of Florida, Gainesville, FL 32610, USA; (J.F.-T.); (S.-K.C.); (I.Z.); (K.B.)
- Department of Surgery, Washington University in St. Louis, St. Louis, MO 63110, USA; (J.-K.S.); (J.C.); (M.L.); (W.C.)
- Department of Cell Biology and Physiology, Washington University in St. Louis, St. Louis, MO 63110, USA
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8
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Shin JK, Kim JS. Cytoprotection of rat hepatocytes by desipramine in a model of simulated ischemia/reperfusion. Biochem Biophys Rep 2021; 27:101075. [PMID: 34337165 PMCID: PMC8313843 DOI: 10.1016/j.bbrep.2021.101075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/29/2021] [Accepted: 07/08/2021] [Indexed: 11/19/2022] Open
Abstract
We investigated the cytoprotective effect of desipramine (DMI) during in vitro simulated ischemia/reperfusion (I/R) of rat hepatocytes. Primary hepatocytes isolated from male Sprague-Dawley rats were subjected to 4 h of anoxia at pH 6.2 followed by normoxia at pH 7.4 for 2 h to simulate ischemia and reperfusion, respectively. During simulated reperfusion, some hepatocytes were reoxygenated using media containing 5 μM DMI. Necrotic cell death and the onset of mitochondrial permeability transition (MPT) were assessed using fluorometry and confocal microscopy. Changes in autophagic flux and autophagy-related proteins (ATGs) were analyzed by immunoblotting. DMI was shown to substantially delay MPT onset and suppress I/R related cell damage. Mechanistically, DMI treatment during reperfusion increased the expression level of the microtubule-associated protein 1A/1B-light chain 3 (LC3) processing enzymes, ATG4B and ATG7. Genetic knockdown of ATG4B abolished the cytoprotective effect of DMI. Together, these results indicate that DMI is a unique agent which enhances LC3 processing in an ATG4B-dependent way.
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Affiliation(s)
- Jun-Kyu Shin
- Department of Surgery, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Jae-Sung Kim
- Department of Surgery, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Department of Cell Biology & Physiology, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Corresponding author. Department of Surgery, Department of Cell Biology & Physiology, Washington University in St. Louis, St. Louis, MO, 63110, USA.
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Morciano G, Naumova N, Koprowski P, Valente S, Sardão VA, Potes Y, Rimessi A, Wieckowski MR, Oliveira PJ. The mitochondrial permeability transition pore: an evolving concept critical for cell life and death. Biol Rev Camb Philos Soc 2021; 96:2489-2521. [PMID: 34155777 DOI: 10.1111/brv.12764] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 05/28/2021] [Accepted: 06/04/2021] [Indexed: 02/06/2023]
Abstract
In this review, we summarize current knowledge of perhaps one of the most intriguing phenomena in cell biology: the mitochondrial permeability transition pore (mPTP). This phenomenon, which was initially observed as a sudden loss of inner mitochondrial membrane impermeability caused by excessive calcium, has been studied for almost 50 years, and still no definitive answer has been provided regarding its mechanisms. From its initial consideration as an in vitro artifact to the current notion that the mPTP is a phenomenon with physiological and pathological implications, a long road has been travelled. We here summarize the role of mitochondria in cytosolic calcium control and the evolving concepts regarding the mitochondrial permeability transition (mPT) and the mPTP. We show how the evolving mPTP models and mechanisms, which involve many proposed mitochondrial protein components, have arisen from methodological advances and more complex biological models. We describe how scientific progress and methodological advances have allowed milestone discoveries on mPTP regulation and composition and its recognition as a valid target for drug development and a critical component of mitochondrial biology.
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Affiliation(s)
- Giampaolo Morciano
- Maria Cecilia Hospital, GVM Care & Research, Via Corriera 1, Cotignola, Ravenna, 48033, Italy.,Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Via Fossato di Mortara 70, Ferrara, 44121, Italy
| | - Natalia Naumova
- Department of Cardiac Thoracic and Vascular Sciences and Public Health, University of Padua Medical School, Via Giustiniani 2, Padova, 35128, Italy
| | - Piotr Koprowski
- Laboratory of Intracellular Ion Channels, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, Warsaw, 02-093, Poland
| | - Sara Valente
- CNC - Center for Neuroscience and Cell Biology, CIBB - Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, UC Biotech, Biocant Park, Cantanhede, 3060-197, Portugal
| | - Vilma A Sardão
- CNC - Center for Neuroscience and Cell Biology, CIBB - Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, UC Biotech, Biocant Park, Cantanhede, 3060-197, Portugal
| | - Yaiza Potes
- Laboratory of Mitochondrial Biology and Metabolism, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, Warsaw, 02-093, Poland
| | - Alessandro Rimessi
- Department of Medical Sciences, Section of Experimental Medicine, Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Via Fossato di Mortara 70, Ferrara, 44121, Italy
| | - Mariusz R Wieckowski
- Laboratory of Mitochondrial Biology and Metabolism, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, Warsaw, 02-093, Poland
| | - Paulo J Oliveira
- CNC - Center for Neuroscience and Cell Biology, CIBB - Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, UC Biotech, Biocant Park, Cantanhede, 3060-197, Portugal
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10
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Deng F, Zheng X, Sharma I, Dai Y, Wang Y, Kanwar YS. Regulated cell death in cisplatin-induced AKI: relevance of myo-inositol metabolism. Am J Physiol Renal Physiol 2021; 320:F578-F595. [PMID: 33615890 PMCID: PMC8083971 DOI: 10.1152/ajprenal.00016.2021] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 12/14/2022] Open
Abstract
Regulated cell death (RCD), distinct from accidental cell death, refers to a process of well-controlled programmed cell death with well-defined pathological mechanisms. In the past few decades, various terms for RCDs were coined, and some of them have been implicated in the pathogenesis of various types of acute kidney injury (AKI). Cisplatin is widely used as a chemotherapeutic drug for a broad spectrum of cancers, but its usage was hampered because of being highly nephrotoxic. Cisplatin-induced AKI is commonly seen clinically, and it also serves as a well-established prototypic model for laboratory investigations relevant to acute nephropathy affecting especially the tubular compartment. Literature reports over a period of three decades have indicated that there are multiple types of RCDs, including apoptosis, necroptosis, pyroptosis, ferroptosis, and mitochondrial permeability transition-mediated necrosis, and some of them are pertinent to the pathogenesis of cisplatin-induced AKI. Interestingly, myo-inositol metabolism, a vital biological process that is largely restricted to the kidney, seems to be relevant to the pathogenesis of certain forms of RCDs. A comprehensive understanding of RCDs in cisplatin-induced AKI and their relevance to myo-inositol homeostasis may yield novel therapeutic targets for the amelioration of cisplatin-related nephropathy.
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Affiliation(s)
- Fei Deng
- Department of Urology, The Second Xiangya Hospital, Central South University, Changsha, China
- Department of Pathology, Northwestern University, Chicago, Illinois
- Department of Medicine, Northwestern University, Chicago, Illinois
| | - Xiaoping Zheng
- Department of Pathology, Northwestern University, Chicago, Illinois
- Department of Medicine, Northwestern University, Chicago, Illinois
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Isha Sharma
- Department of Pathology, Northwestern University, Chicago, Illinois
- Department of Medicine, Northwestern University, Chicago, Illinois
| | - Yingbo Dai
- Department of Urology, The Third Xiangya Hospital, Central South University, Changsha, China
- Department of Urology, The Fifth Affiliated Hospital of Sun Yet-Sen University, Zhuhai, China
| | - Yinhuai Wang
- Department of Urology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yashpal S Kanwar
- Department of Pathology, Northwestern University, Chicago, Illinois
- Department of Medicine, Northwestern University, Chicago, Illinois
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11
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Hu J, Lemasters JJ. Suppression of iron mobilization from lysosomes to mitochondria attenuates liver injury after acetaminophen overdose in vivo in mice: Protection by minocycline. Toxicol Appl Pharmacol 2020; 392:114930. [PMID: 32109512 DOI: 10.1016/j.taap.2020.114930] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 02/19/2020] [Accepted: 02/24/2020] [Indexed: 12/20/2022]
Abstract
Acetaminophen (APAP) overdose causes hepatotoxicity involving mitochondrial dysfunction. Previous studies showed that translocation of Fe2+ from lysosomes into mitochondria by the mitochondrial Ca2+ uniporter (MCU) promotes the mitochondrial permeability transition (MPT) after APAP. Here, our Aim was to assess protection by iron chelation and MCU inhibition against APAP hepatotoxicity in mice. C57BL/6 mice and hepatocytes were administered toxic doses of APAP with and without starch-desferal (an iron chelator), minocycline (MCU inhibitor), or N-acetylcysteine (NAC). In mice, starch-desferal and minocycline pretreatment decreased ALT and liver necrosis after APAP by >60%. At 24 h after APAP, loss of fluorescence of mitochondrial rhodamine 123 occurred in pericentral hepatocytes often accompanied by propidium iodide labeling, indicating mitochondrial depolarization and cell death. Starch-desferal and minocycline pretreatment decreased mitochondrial depolarization and cell death by more than half. In cultured hepatocytes, cell killing at 10 h after APAP decreased from 83% to 49%, 35% and 27%, respectively, by 1 h posttreatment with minocycline, NAC, and minocycline plus NAC. With 4 h posttreatment in vivo, minocycline and minocycline plus NAC decreased ALT and necrosis by ~20% and ~50%, respectively, but NAC alone was not effective. In conclusion, minocycline and starch-desferal decrease mitochondrial dysfunction and severe liver injury after APAP overdose, suggesting that the MPT is likely triggered by iron uptake into mitochondria through MCU. In vivo, minocycline and minocycline plus NAC posttreatment after APAP protect at later time points than NAC alone, indicating that minocycline has a longer window of efficacy than NAC.
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Affiliation(s)
- Jiangting Hu
- Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC 29425, United States of America; Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, United States of America
| | - John J Lemasters
- Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC 29425, United States of America; Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, United States of America; Department of Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, United States of America.
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12
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Miranda ÉGA, Araujo-Chaves JC, Kawai C, Brito AMM, Dias IWR, Arantes JT, Nantes-Cardoso IL. Cardiolipin Structure and Oxidation Are Affected by Ca 2+ at the Interface of Lipid Bilayers. Front Chem 2020; 7:930. [PMID: 32039150 PMCID: PMC6986261 DOI: 10.3389/fchem.2019.00930] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 12/20/2019] [Indexed: 12/13/2022] Open
Abstract
Ca2+-overload contributes to the oxidation of mitochondrial membrane lipids and associated events such as the permeability transition pore (MPTP) opening. Numerous experimental studies about the Ca2+/cardiolipin (CL) interaction are reported in the literature, but there are few studies in conjunction with theoretical approaches based on ab initio calculations. In the present study, the lipid fraction of the inner mitochondrial membrane was modeled as POPC/CL large unilamellar vesicles (LUVs). POPC/CL and, comparatively, POPC, and CL LUVs were challenged by singlet molecular oxygen using the anionic porphyrin TPPS4 as a photosensitizer and by free radicals produced by Fe2+-citrate. Calcium ion favored both types of lipid oxidation in a lipid composition-dependent manner. In membranes containing predominantly or exclusively POPC, Ca2+ increased the oxidation at later reaction times while the oxidation of CL membranes was exacerbated at the early times of reaction. Considering that Ca2+ interaction affects the lipid structure and packing, density functional theory (DFT) calculations were applied to the Ca2+ association with totally and partially protonated and deprotonated CL, in the presence of water. The interaction of totally and partially protonated CL head groups with Ca2+ decreased the intramolecular P-P distance and increased the hydrophobic volume of the acyl chains. Consistently with the theoretically predicted effect of Ca2+ on CL, in the absence of pro-oxidants, giant unilamellar vesicles (GUVs) challenged by Ca2+ formed buds and many internal vesicles. Therefore, Ca2+ induces changes in CL packing and increases the susceptibility of CL to the oxidation promoted by free radicals and excited species.
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Affiliation(s)
- Érica G A Miranda
- Laboratory of Nanostructures for Biology and Advanced Materials, NanoBioMAv, Center of Natural Sciences and Humanities, Federal University of ABC, Santo André, Brazil
| | - Juliana C Araujo-Chaves
- Laboratory of Nanostructures for Biology and Advanced Materials, NanoBioMAv, Center of Natural Sciences and Humanities, Federal University of ABC, Santo André, Brazil
| | - Cintia Kawai
- Laboratory of Nanostructures for Biology and Advanced Materials, NanoBioMAv, Center of Natural Sciences and Humanities, Federal University of ABC, Santo André, Brazil
| | - Adrianne M M Brito
- Laboratory of Nanostructures for Biology and Advanced Materials, NanoBioMAv, Center of Natural Sciences and Humanities, Federal University of ABC, Santo André, Brazil
| | - Igor W R Dias
- Center of Engineering, Modeling, and Applied Social Sciences, Federal University of ABC, Santo André, Brazil
| | - Jeverson T Arantes
- Center of Engineering, Modeling, and Applied Social Sciences, Federal University of ABC, Santo André, Brazil
| | - Iseli L Nantes-Cardoso
- Laboratory of Nanostructures for Biology and Advanced Materials, NanoBioMAv, Center of Natural Sciences and Humanities, Federal University of ABC, Santo André, Brazil
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13
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Barzyc A, Łysik W, Słyk J, Kuszewski M, Zarębiński M, Wojciechowska M, Cudnoch-Jędrzejewska A. Reperfusion injury as a target for diminishing infarct size. Med Hypotheses 2020; 137:109558. [PMID: 31958650 DOI: 10.1016/j.mehy.2020.109558] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 12/15/2019] [Accepted: 01/07/2020] [Indexed: 12/30/2022]
Abstract
Therapies for preventing reperfusion injury (RI) have been widely studied. However, the attempts to transfer cardioprotective therapies for reducing RI from experiments into clinical practice have been so far unsuccessful. Pathophysiological mechanisms of RI are complicated and compose of many pathways e.g. hypercontracture-mediated sarcolemma rupture, mitochondrial permeability transition pore persistent opening, reactive oxygen species formation, inflammation and no-reflow phenomenon. Based on research, it cannot be determined which mechanism dominates, probably they cooperate with a domination of one or another in different clinical circumstances. Our hypothesis is, that only intervention that at the same time interferes with different (all?) pathways of RI may turn out to be effective in decreasing the final area of infarction.
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Affiliation(s)
- A Barzyc
- Department of Experimental and Clinical Physiology, Laboratory of Center for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - W Łysik
- Department of Experimental and Clinical Physiology, Laboratory of Center for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - J Słyk
- Department of Experimental and Clinical Physiology, Laboratory of Center for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - M Kuszewski
- Department of Experimental and Clinical Physiology, Laboratory of Center for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
| | - M Zarębiński
- Independent Public Specialist Western Hospital John Paul II in Grodzisk Mazowiecki, Poland
| | - M Wojciechowska
- Department of Experimental and Clinical Physiology, Laboratory of Center for Preclinical Research, Medical University of Warsaw, Warsaw, Poland; Independent Public Specialist Western Hospital John Paul II in Grodzisk Mazowiecki, Poland.
| | - A Cudnoch-Jędrzejewska
- Department of Experimental and Clinical Physiology, Laboratory of Center for Preclinical Research, Medical University of Warsaw, Warsaw, Poland
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14
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Fujii Y, Matsumura H, Yamazaki S, Shirasu A, Nakakura H, Ogihara T, Ashida A. Efficacy of a mitochondrion-targeting agent for reducing the level of urinary protein in rats with puromycin aminonucleoside-induced minimal-change nephrotic syndrome. PLoS One 2020; 15:e0227414. [PMID: 31905213 PMCID: PMC6944386 DOI: 10.1371/journal.pone.0227414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/18/2019] [Indexed: 01/22/2023] Open
Abstract
Background Oxidative stress is a major factor responsible for minimal-change nephrotic syndrome (MCNS), which occurs most commonly in children. However, the influence of oxidative stress localized to mitochondria remains unclear. We examined the effect of a mitochondrion-targeting antioxidant, MitoTEMPO, in rats with puromycin aminonucleoside (PAN)-induced MCNS to clarify the degree to which mitochondrial oxidative stress affects MCNS. Materials and methods Thirty Wistar rats were divided into three groups: normal saline group (n = 7), PAN group (n = 12), and PAN + MitoTEMPO group (n = 11). Rats in the PAN and PAN + MitoTEMPO groups received PAN on day 1, and those in the PAN + MitoTEMPO group received MitoTEMPO on days 0 to 9. Whole-day urine samples were collected on days 3 and 9, and samples of glomeruli and blood were taken for measurement of lipid peroxidation products. We also estimated the mitochondrial damage score in podocytes in all 3 groups using electron microscopy. Results Urinary protein excretion on day 9 and the levels of lipid peroxidation products in urine, glomeruli, and blood were significantly lower in the PAN + MitoTEMPO group than in the PAN group (p = 0.0019, p = 0.011, p = 0.039, p = 0.030). The mitochondrial damage score in podocytes was significantly lower in the PAN + MitoTEMPO group than in the PAN group (p <0.0001). Conclusions This mitochondrion-targeting agent was shown to reduce oxidative stress and mitochondrial damage in a MCNS model. A radical scavenger targeting mitochondria could be a promising drug for treatment of MCNS.
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Affiliation(s)
- Yuko Fujii
- Department of Pediatrics, Osaka Medical College, Takatsuki, Osaka, Japan
| | - Hideki Matsumura
- Department of Pediatrics, Osaka Medical College, Takatsuki, Osaka, Japan
| | - Satoshi Yamazaki
- Department of Pediatrics, Osaka Medical College, Takatsuki, Osaka, Japan
| | - Akihiko Shirasu
- Department of Pediatrics, Hirakata City Hospital, Hirakata, Osaka, Japan
| | - Hyogo Nakakura
- Department of Hemodialysis and Apheresis, Arisawa General Hospital, Hirakata, Osaka, Japan
| | - Tohru Ogihara
- Department of Pediatrics, Osaka Medical College, Takatsuki, Osaka, Japan
| | - Akira Ashida
- Department of Pediatrics, Osaka Medical College, Takatsuki, Osaka, Japan
- * E-mail:
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15
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Ishikawa Y, Kitagawa H, Sawada T, Seto T, Takahashi K, Yamazaki T. Deuterium oxide protects against myocardial injury induced by ischemia and reperfusion in rats. SCAND CARDIOVASC J 2019; 53:329-336. [PMID: 31455109 DOI: 10.1080/14017431.2019.1657939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Objectives. Although deuterium oxide (D2O) has preservative property on the extracted organ, whether D2O also protects the in situ myocardial injury remains unknown. Using cardiac microdialysis, local administration of D2O through dialysis probe was applied in situ rat heart. We examined the effect of the D2O on the myocardial injury induced ischemia, reperfusion, and chemical hypoxia. Methodology. We measured dialysate myoglobin levels during 30 min of coronary occlusion and reperfusion in the absence and presence of D2O. Furthermore, to confirm the effect of D2O on NaCN induced myocardial injury, we measured the dialysate myoglobin levels with local perfusion of NaCN in the absence and presence of D2O. Results. The dialysate myoglobin levels increased from 177 ± 45 ng/mL at baseline to 3030 ± 1523 ng/mL during 15-30 min of coronary occlusion and further increased to 8588 ± 1684ng/mL at 0-15 min of reperfusion. The dialysate myoglobin levels with 60 min local perfusion of NaCN increased to 1214 ± 279 ng/mL. D2O attenuated myocardial myoglobin release during 15-30 min of coronary occlusion and 0-30 min of reperfusion and 15-60 min of local perfusion of NaCN. Conclusions. D2O might have a beneficial effect of myocardium against ischemia, reperfusion and chemical hypoxia.
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Affiliation(s)
- Yuko Ishikawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Tadashi Sawada
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Tomoyoshi Seto
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Kan Takahashi
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Toji Yamazaki
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Shiga, Japan
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16
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Zhang X, Wu X, Hu Q, Wu J, Wang G, Hong Z, Ren J. Mitochondrial DNA in liver inflammation and oxidative stress. Life Sci 2019; 236:116464. [PMID: 31078546 DOI: 10.1016/j.lfs.2019.05.020] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 05/07/2019] [Accepted: 05/08/2019] [Indexed: 02/07/2023]
Abstract
The function of liver is highly dependent on mitochondria producing ATP for biosynthetic and detoxifying properties. Accumulating evidence indicates that most hepatic disorders are characterized by profound mitochondrial dysfunction. Mitochondrial dysfunction not only exhibits mitochondrial DNA (mtDNA) damage and depletion, but also releases mtDNA. mtDNA is a closed circular molecule encoding 13 of the polypeptides of the oxidative phosphorylation system. Extensive mtDNA lesions could exacerbate mitochondrial oxidative stress and subsequently cause damage to hepatocytes. When mtDNA leaves the confines of mitochondria to the cytosolic and extracellular environment, it can act as damage-associated molecular patterns (DAMPs) to trigger the inflammatory response through the Toll-like receptor 9, inflammasomes, and stimulator of interferon genes (STING) pathways and further exacerbate hepatocellular damage and even remote organs injury. In addition, mtDNA also plays a vital role in hepatitis B virus (HBV)-related liver injury and hepatocellular carcinoma (HCC). In this review, we describe mtDNA alterations during liver injury, focusing on the mechanisms of mtDNA-mediated liver inflammation and oxidative stress injury.
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Affiliation(s)
- Xufei Zhang
- Research Institute of General Surgery, Jinling Hospital, Nanjing Medical University, Nanjing 210002, PR China; Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China
| | - Xiuwen Wu
- Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing 210002, PR China; Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China.
| | - Qiongyuan Hu
- Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing 210002, PR China; Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China
| | - Jie Wu
- Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing 210002, PR China; Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China
| | - Gefei Wang
- Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing 210002, PR China; Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China
| | - Zhiwu Hong
- Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing 210002, PR China; Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China
| | - Jianan Ren
- Research Institute of General Surgery, Jinling Hospital, Nanjing Medical University, Nanjing 210002, PR China; Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China.
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- Lab for Trauma and Surgical Infections, Jinling Hospital, Nanjing 210002, PR China
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17
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Chen T, Vunjak-Novakovic G. Human Tissue-Engineered Model of Myocardial Ischemia-Reperfusion Injury. Tissue Eng Part A 2018; 25:711-724. [PMID: 30311860 DOI: 10.1089/ten.tea.2018.0212] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
IMPACT STATEMENT Reducing ischemia-reperfusion injury would significantly improve patient survival. Current preclinical models are inadequate because they rely on animals, which do not emulate human physiology and the clinical setting. We developed a human tissue platform that allowed us to assess the human cardiac response, and demonstrated the platform's utility by measuring injury during ischemia-reperfusion and the effects of cardioprotective strategies. The model provides a foundation for future studies on how patient-specific backgrounds may affect response to therapeutic strategies. These steps will be necessary to help translate therapies into the clinical setting.
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Affiliation(s)
- Timothy Chen
- 1 Department of Biomedical Engineering, Columbia University in the City of New York, New York, New York
| | - Gordana Vunjak-Novakovic
- 1 Department of Biomedical Engineering, Columbia University in the City of New York, New York, New York.,2 Department of Medicine, Columbia University in the City of New York, New York, New York
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18
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Chen T, Vunjak-Novakovic G. In vitro Models of Ischemia-Reperfusion Injury. REGENERATIVE ENGINEERING AND TRANSLATIONAL MEDICINE 2018; 4:142-153. [PMID: 30393757 PMCID: PMC6208331 DOI: 10.1007/s40883-018-0056-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Accepted: 04/25/2018] [Indexed: 01/23/2023]
Abstract
Timely reperfusion after a myocardial infarction is necessary to salvage the ischemic region; however, reperfusion itself is also a major contributor to the final tissue damage. Currently, there is no clinically relevant therapy available to reduce ischemia-reperfusion injury (IRI). While many drugs have shown promise in reducing IRI in preclinical studies, none of these drugs have demonstrated benefit in large clinical trials. Part of this failure to translate therapies can be attributed to the reliance on small animal models for preclinical studies. While animal models encapsulate the complexity of the systemic in vivo environment, they do not fully recapitulate human cardiac physiology. Furthermore, it is difficult to uncouple the various interacting pathways in vivo. In contrast, in vitro models using isolated cardiomyocytes allow studies of the direct effect of therapeutics on cardiomyocytes. External factors can be controlled in simulated ischemia-reperfusion to allow for better understanding of the mechanisms that drive IRI. In addition, the availability of cardiomyocytes derived from human induced pluripotent stem cells (hIPS-CMs) offers the opportunity to recapitulate human physiology in vitro. Unfortunately, hIPS-CMs are relatively fetal in phenotype, and are more resistant to hypoxia than the mature cells. Tissue engineering platforms can promote cardiomyocyte maturation for a more predictive physiologic response. These platforms can further be improved upon to account for the heterogenous patient populations seen in the clinical settings and facilitate the translation of therapies. Thereby, the current preclinical studies can be further developed using currently available tools to achieve better predictive drug testing and understanding of IRI. In this article, we discuss the state of the art of in vitro modeling of IRI, propose the roles for tissue engineering in studying IRI and testing the new therapeutic modalities, and how the human tissue models can facilitate translation into the clinic.
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Affiliation(s)
- Timothy Chen
- Department of Biomedical Engineering, University in the City of New York
| | - Gordana Vunjak-Novakovic
- Department of Biomedical Engineering, University in the City of New York
- Department of Medicine Columbia University in the City of New York
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19
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20
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Shi X, Bai H, Zhao M, Li X, Sun X, Jiang H, Fu A. Treatment of acetaminophen-induced liver injury with exogenous mitochondria in mice. Transl Res 2018; 196:31-41. [PMID: 29548626 DOI: 10.1016/j.trsl.2018.02.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Revised: 02/20/2018] [Accepted: 02/20/2018] [Indexed: 01/07/2023]
Abstract
Drug-induced liver injury shares a common feature of mitochondrial dysfunction. Mitochondrial therapy (mitotherapy), which replaces malfunctional mitochondria with functional exogenous mitochondria, may be a fundamental approach for treating drug-mediated hepatotoxicity. Here, we suggested that mitochondria isolated from human hepatoma cell could be used to treat acetaminophen (APAP)-induced liver injury in mice. When the mitochondria were added into the cell media, they could enter primarily cultured mouse hepatocyte. When the mitochondria were intravenously injected into mice, they distribute in several tissues, including liver. In the model mice of APAP-induced liver injury, mitochondria treatment increased hepatocyte energy supply, reduced oxidation stress, and consequently ameliorated tissue injury. The study suggests that exogenous mitochondria could be an effective therapeutic strategy in treating APAP-induced liver injury.
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Affiliation(s)
- Xianxun Shi
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Huiyuan Bai
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Ming Zhao
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Xiaorong Li
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Xianchao Sun
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Hongbo Jiang
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Ailing Fu
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China.
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21
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Zhang J, Yu Q, Han L, Chen C, Li H, Han G. Study on the apoptosis mediated by cytochrome c and factors that affect the activation of bovine longissimus muscle during postmortem aging. Apoptosis 2018; 22:777-785. [PMID: 28405769 DOI: 10.1007/s10495-017-1374-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
This study investigates whether bovine longissimus muscle cell apoptosis occurs during postmortem aging and whether apoptosis is dependent on the mitochondria pathway. This study also determines the apoptosis process mediated by cytochrome c after its release from mitochondria and the factors that affect the activation processes. Results indicate that apoptotic nuclei were detected at 12 h postmortem. Cytochrome c release from the mitochondria to the cytoplasm activated the caspase-9 and caspase-3 at early postmortem aging and the activation of caspase-9 occurs before the activation of caspase-3. The pH level decreased during the first 48 h postmortem, whereas the mitochondria membrane permeability increased from 6 to 12 h. Results demonstrate that an apoptosis process of bovine muscle occurred during postmortem aging. Apoptosis was dependent on the mitochondria pathway and occurred at early postmortem aging. Increased mitochondria membrane permeability and low pH are necessary conditions for the release of cytochrome c during postmortem aging.
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Affiliation(s)
- Jiaying Zhang
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, 730070, China
| | - Qunli Yu
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, 730070, China.
| | - Ling Han
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, 730070, China
| | - Cheng Chen
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, 730070, China
| | - Hang Li
- Chongqing Heng Du Agricultural Development Co., Ltd., Fengdu, 408200, China
| | - Guangxing Han
- Shandong Lorain Corporation Co., Ltd., Linyi, 276600, China
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22
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DeHart DN, Fang D, Heslop K, Li L, Lemasters JJ, Maldonado EN. Opening of voltage dependent anion channels promotes reactive oxygen species generation, mitochondrial dysfunction and cell death in cancer cells. Biochem Pharmacol 2017; 148:155-162. [PMID: 29289511 DOI: 10.1016/j.bcp.2017.12.022] [Citation(s) in RCA: 128] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 12/26/2017] [Indexed: 12/25/2022]
Abstract
Enhancement of aerobic glycolysis and suppression of mitochondrial metabolism characterize the pro-proliferative Warburg phenotype of cancer cells. High free tubulin in cancer cells closes voltage dependent anion channels (VDAC) to decrease mitochondrial membrane potential (ΔΨ), an effect antagonized by erastin, the canonical promotor of ferroptosis. Previously, we identified six compounds (X1-X6) that also block tubulin-dependent mitochondrial depolarization. Here, we hypothesized that VDAC opening after erastin and X1-X6 increases mitochondrial metabolism and reactive oxygen species (ROS) formation, leading to ROS-dependent mitochondrial dysfunction, bioenergetic failure and cell death. Accordingly, we characterized erastin and the two most potent structurally unrelated lead compounds, X1 and X4, on ROS formation, mitochondrial function and cell viability. Erastin, X1 and X4 increased ΔΨ followed closely by an increase in mitochondrial ROS generation within 30-60 min. Subsequently, mitochondria began to depolarize after an hour or longer indicative of mitochondrial dysfunction. N-acetylcysteine (NAC, glutathione precursor and ROS scavenger) and MitoQ (mitochondrially targeted antioxidant) blocked increased ROS formation after X1 and prevented mitochondrial dysfunction. Erastin, X1 and X4 selectively promoted cell killing in HepG2 and Huh7 human hepatocarcinoma cells compared to primary rat hepatocytes. X1 and X4-dependent cell death was blocked by NAC. These results suggest that ferroptosis induced by erastin and our erastin-like lead compounds was caused by VDAC opening, leading to increased ΔΨ, mitochondrial ROS generation and oxidative stress-induced cell death.
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Affiliation(s)
- David N DeHart
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
| | - Diana Fang
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
| | - Kareem Heslop
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
| | - Li Li
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
| | - John J Lemasters
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States; Department of Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC, United States; Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC, United States; Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, United States; Institute of Theoretical and Experimental Biophysics, Pushchino, Russia.
| | - Eduardo N Maldonado
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States; Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC, United States; Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, United States.
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Ca 2+ ionophores are not suitable for inducing mPTP opening in murine isolated adult cardiac myocytes. Sci Rep 2017; 7:4283. [PMID: 28655872 PMCID: PMC5487341 DOI: 10.1038/s41598-017-04618-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 05/17/2017] [Indexed: 11/08/2022] Open
Abstract
Opening of the mitochondrial permeability transition pore (mPTP) plays a major role in cell death during cardiac ischaemia-reperfusion. Adult isolated rodent cardiomyocytes are valuable cells to study the effect of drugs targeting mPTP. This study investigated whether the use of Ca2+ ionophores (A23187, ionomycin and ETH129) represent a reliable model to study inhibition of mPTP opening in cardiomyocytes. We monitored mPTP opening using the calcein/cobalt fluorescence technique in adult rat and wild type or cyclophilin D (CypD) knock-out mice cardiomyocytes. Cells were either treated with Ca2+ ionophores or subjected to hypoxia followed by reoxygenation. The ionophores induced mPTP-dependent swelling in isolated mitochondria. A23187, but not ionomycin, induced a decrease in calcein fluorescence. This loss could not be inhibited by CypD deletion and was explained by a direct interaction between A23187 and cobalt. ETH129 caused calcein loss, mitochondrial depolarization and cell death but CypD deletion did not alleviate these effects. In the hypoxia-reoxygenation model, CypD deletion delayed both mPTP opening and cell death occurring at the time of reoxygenation. Thus, Ca2+ ionophores are not suitable to induce CypD-dependent mPTP opening in adult murine cardiomyocytes. Hypoxia-reoxygenation conditions appear therefore as the most reliable model to investigate mPTP opening in these cells.
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Koyama T. Lactated Ringer's solution for preventing myocardial reperfusion injury. IJC HEART & VASCULATURE 2017; 15:1-8. [PMID: 28616565 PMCID: PMC5458128 DOI: 10.1016/j.ijcha.2017.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 03/31/2017] [Indexed: 11/30/2022]
Abstract
Reperfusion of ischemic myocardium is crucial for salvaging myocardial cells from ischemic cell death. However, reperfusion itself induces various deleterious effects on the ischemic myocardium. These effects, known collectively as reperfusion injury, comprise stunned myocardium, reperfusion-induced arrhythmia, microvascular reperfusion injury, and lethal reperfusion injury. No approach has proven successful in preventing any of these injuries in the clinical setting. My colleagues and I recently proposed a new postconditioning protocol, postconditioning with lactate-enriched blood (PCLeB), for the prevention of reperfusion injury. This new approach consists of intermittent reperfusion and timely coronary injections of lactated Ringer's solution, aiming to achieve controlled reperfusion with cellular oxygenation and minimal lactate washout from the cells. This approach appeared to be effective in preventing all types of reperfusion injury in patients with ST-segment elevation myocardial infarction (STEMI), and we have already reported excellent in-hospital outcomes of patients with STEMI treated using PCLeB. In this review article, I discuss a possible mechanism of reperfusion injury, which we believe to be valid and which we targeted using this new approach, and I report how the approach worked in preventing each type of reperfusion injury.
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Key Words
- CAG, coronary angiography
- CK, creatine kinase
- CRP, C-reactive protein
- ECG, electrocardiography
- Lactate
- MI, myocardial infarction
- MPT, mitochondrial permeability transition
- No-reflow phenomenon
- PCI, percutaneous coronary intervention
- PCLeB, postconditioning with lactate-enriched blood
- PVC, premature ventricular contraction
- Postconditioning
- Reperfusion arrhythmia
- ST-segment elevation myocardial infarction
- STEMI, ST-segment elevation myocardial infarction
- Stunning
- TIMI, thrombolysis in myocardial infarction
- VF, ventricular fibrillation
- VT, ventricular tachycardia
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Affiliation(s)
- Takashi Koyama
- Cardiology Department, Saitama Municipal Hospital, 2460 Mimuro, Midori-ku, Saitama City, Saitama 336-8522, Japan
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25
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Lesnefsky EJ, Chen Q, Hoppel CL. Mitochondrial Metabolism in Aging Heart. Circ Res 2017; 118:1593-611. [PMID: 27174952 DOI: 10.1161/circresaha.116.307505] [Citation(s) in RCA: 214] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/05/2016] [Indexed: 02/07/2023]
Abstract
Altered mitochondrial metabolism is the underlying basis for the increased sensitivity in the aged heart to stress. The aged heart exhibits impaired metabolic flexibility, with a decreased capacity to oxidize fatty acids and enhanced dependence on glucose metabolism. Aging impairs mitochondrial oxidative phosphorylation, with a greater role played by the mitochondria located between the myofibrils, the interfibrillar mitochondria. With aging, there is a decrease in activity of complexes III and IV, which account for the decrease in respiration. Furthermore, aging decreases mitochondrial content among the myofibrils. The end result is that in the interfibrillar area, there is ≈50% decrease in mitochondrial function, affecting all substrates. The defective mitochondria persist in the aged heart, leading to enhanced oxidant production and oxidative injury and the activation of oxidant signaling for cell death. Aging defects in mitochondria represent new therapeutic targets, whether by manipulation of the mitochondrial proteome, modulation of electron transport, activation of biogenesis or mitophagy, or the regulation of mitochondrial fission and fusion. These mechanisms provide new ways to attenuate cardiac disease in elders by preemptive treatment of age-related defects, in contrast to the treatment of disease-induced dysfunction.
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Affiliation(s)
- Edward J Lesnefsky
- From the Division of Cardiology, Department of Medicine, Pauley Heart Center (E.J.L, Q.C.), Departments of Biochemistry and Molecular Biology and Physiology and Biophsyics (E.J.L.), Virginia Commonwealth University, Richmond, VA (E.J.L., Q.C.); Medical Service, McGuire Veterans Affairs Medical Center, Richmond, VA (E.J.L.); and Departments of Pharmacology (C.L.H.) and Medicine (E.J.L., C.L.H.), Center for Mitochondrial Disease (C.L.H.), Case Western Reserve University, School of Medicine, Cleveland, OH
| | - Qun Chen
- From the Division of Cardiology, Department of Medicine, Pauley Heart Center (E.J.L, Q.C.), Departments of Biochemistry and Molecular Biology and Physiology and Biophsyics (E.J.L.), Virginia Commonwealth University, Richmond, VA (E.J.L., Q.C.); Medical Service, McGuire Veterans Affairs Medical Center, Richmond, VA (E.J.L.); and Departments of Pharmacology (C.L.H.) and Medicine (E.J.L., C.L.H.), Center for Mitochondrial Disease (C.L.H.), Case Western Reserve University, School of Medicine, Cleveland, OH
| | - Charles L Hoppel
- From the Division of Cardiology, Department of Medicine, Pauley Heart Center (E.J.L, Q.C.), Departments of Biochemistry and Molecular Biology and Physiology and Biophsyics (E.J.L.), Virginia Commonwealth University, Richmond, VA (E.J.L., Q.C.); Medical Service, McGuire Veterans Affairs Medical Center, Richmond, VA (E.J.L.); and Departments of Pharmacology (C.L.H.) and Medicine (E.J.L., C.L.H.), Center for Mitochondrial Disease (C.L.H.), Case Western Reserve University, School of Medicine, Cleveland, OH.
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Bak DW, Pizzagalli MD, Weerapana E. Identifying Functional Cysteine Residues in the Mitochondria. ACS Chem Biol 2017; 12:947-957. [PMID: 28157297 DOI: 10.1021/acschembio.6b01074] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The mitochondria are dynamic organelles that regulate oxidative metabolism and mediate cellular redox homeostasis. Proteins within the mitochondria are exposed to large fluxes in the surrounding redox environment. In particular, cysteine residues within mitochondrial proteins sense and respond to these redox changes through oxidative modifications of the cysteine thiol group. These oxidative modifications result in a loss in cysteine reactivity, which can be monitored using cysteine-reactive chemical probes and quantitative mass spectrometry (MS). Analysis of cell lysates treated with cysteine-reactive probes enable the identification of hundreds of cysteine residues, however, the mitochondrial proteome is poorly represented (<10% of identified peptides), due to the low abundance of mitochondrial proteins and suppression of mitochondrial peptide MS signals by highly abundant cytosolic peptides. Here, we apply a mitochondrial isolation and purification protocol to substantially increase coverage of the mitochondrial cysteine proteome. Over 1500 cysteine residues from ∼450 mitochondrial proteins were identified, thereby enabling interrogation of an unprecedented number of mitochondrial cysteines. Specifically, these mitochondrial cysteines were ranked by reactivity to identify hyper-reactive cysteines with potential catalytic and regulatory functional roles. Furthermore, analyses of mitochondria exposed to nitrosative stress revealed previously uncharacterized sites of protein S-nitrosation on mitochondrial proteins. Together, the mitochondrial cysteine enrichment strategy presented herein enables detailed characterization of protein modifications that occur within the mitochondria during (patho)physiological fluxes in the redox environment.
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Affiliation(s)
- Daniel W. Bak
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Mattia D. Pizzagalli
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Eranthie Weerapana
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
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Weemhoff JL, Woolbright BL, Jenkins RE, McGill MR, Sharpe MR, Olson JC, Antoine DJ, Curry SC, Jaeschke H. Plasma biomarkers to study mechanisms of liver injury in patients with hypoxic hepatitis. Liver Int 2017; 37:377-384. [PMID: 27429052 PMCID: PMC5243938 DOI: 10.1111/liv.13202] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 07/12/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND & AIMS Hypoxic hepatitis is a clinical condition precipitated by prolonged periods of oxygen deprivation to the liver. It can have several underlying causes. Despite its prevalence in critically ill patients, which can reach upwards of 10%, very little is known about the mechanisms of injury. Thus, we set out to measure previously identified circulating biomarkers in an attempt to describe mechanisms of injury following hypoxic hepatitis. METHODS Plasma from patients diagnosed with hypoxic hepatitis was collected for this study. Biomarkers of hepatocellular injury, mitochondrial damage and cell death were measured. These results were compared against results obtained from well-characterized acetaminophen overdose patients. RESULTS At peak injury, ALT measured 4082±606 U/L and gradually decreased over 5 days, corresponding to the clinically observed pattern of hypoxic hepatitis. Levels of GDH showed a similar pattern, but neither ALT nor GDH were significantly higher in these patients than in acetaminophen patients. Plasma levels of DNA fragments mimicked hepatocellular injury as measured by ALT and miRNA-122. Interestingly, we found a significant increase in caspase-cleaved cytokeratin-18; however, the full-length form greatly exceeded the cleaved form at the time of maximum injury (45837±12085 vs 2528±1074 U/L). We also found an increase in acHMGB1 at later time points indicating a possible role of inflammation, but cytokine levels at these times were actually decreased relative to early time points. CONCLUSIONS The mechanism of injury following hypoxic hepatitis involves mitochondrial damage and DNA fragmentation. Importantly, necrosis, rather than apoptosis, is the main mode of cell death.
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Affiliation(s)
- James L. Weemhoff
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS USA
| | - Benjamin L. Woolbright
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS USA
| | - Rosalind E. Jenkins
- MRC Centre for Drug Safety Science, Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool UK
| | - Mitchell R. McGill
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS USA
| | - Matthew R. Sharpe
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS USA
| | - Jody C. Olson
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS USA
| | - Daniel J. Antoine
- MRC Centre for Drug Safety Science, Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool UK
| | - Steven C. Curry
- Department of Medical Toxicology, Banner - University Medical Center Phoenix, Department of Medicine, and the Center for Toxicology and Pharmacology Education and Research, University of Arizona College of Medicine, Phoenix, Arizona
| | - Hartmut Jaeschke
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS USA
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Mitochondrial Dysfunction in Cardiovascular Aging. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 982:451-464. [PMID: 28551802 DOI: 10.1007/978-3-319-55330-6_24] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mitochondria are the prime source of ATP in cardiomyocytes. Impairment of mitochondrial metabolism results in damage to existing proteins and DNA. Such deleterious effects are part and parcel of the aging process, reducing the ability of cardiomyocytes to counter stress, such as myocardial infarction and consequent reperfusion. In such conditions, mitochondria in the heart of aged individuals exhibit decreased oxidative phosphorylation, decreased ATP production, and increased net reactive oxygen species production; all of these effects are independent of the decrease in number of mitochondria that occurs in these situations. Rather than being associated with the mitochondrial population in toto, these defects are almost exclusively confined to those organelles positioned between myofibrils (interfibrillar mitochondria). It is in complex III and IV where these dysfunctional aspects are manifested. In an apparent effort to correct mitochondrial metabolic defects, affected organelles are to some extent eliminated by mitophagy; at the same time, new, unaffected organelles are generated by fission of mitochondria. Because these cardiac health issues are localized to specific mitochondria, these organelles offer potential targets for therapeutic approaches that could favorably affect the aging process in heart.
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Go KL, Lee S, Behrns KE, Kim JS. Mitochondrial Damage and Mitophagy in Ischemia/Reperfusion-Induced Liver Injury. MOLECULES, SYSTEMS AND SIGNALING IN LIVER INJURY 2017:183-219. [DOI: 10.1007/978-3-319-58106-4_9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
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30
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Żurawik TM, Pomorski A, Belczyk-Ciesielska A, Goch G, Niedźwiedzka K, Kucharczyk R, Krężel A, Bal W. Revisiting Mitochondrial pH with an Improved Algorithm for Calibration of the Ratiometric 5(6)-carboxy-SNARF-1 Probe Reveals Anticooperative Reaction with H+ Ions and Warrants Further Studies of Organellar pH. PLoS One 2016; 11:e0161353. [PMID: 27557123 PMCID: PMC4996429 DOI: 10.1371/journal.pone.0161353] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 08/03/2016] [Indexed: 11/18/2022] Open
Abstract
Fluorescence measurements of pH and other analytes in the cell rely on accurate calibrations, but these have routinely used algorithms that inadequately describe the properties of indicators. Here, we have established a more accurate method for calibrating and analyzing data obtained using the ratiometric probe 5(6)-carboxy-SNARF-1. We tested the implications of novel approach to measurements of pH in yeast mitochondria, a compartment containing a small number of free H+ ions. Our findings demonstrate that 5(6)-carboxy-SNARF-1 interacts with H+ ions inside the mitochondria in an anticooperative manner (Hill coefficient n of 0.5) and the apparent pH inside the mitochondria is ~0.5 unit lower than had been generally assumed. This result, at odds with the current consensus on the mechanism of energy generation in the mitochondria, is in better agreement with theoretical considerations and warrants further studies of organellar pH.
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Affiliation(s)
- Tomasz Michał Żurawik
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Adam Pomorski
- Department of Chemical Biology, Faculty of Biotechnology, University of Wrocław, F. Joliot-Curie 14A, 50-383, Wrocław, Poland
| | | | - Grażyna Goch
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Katarzyna Niedźwiedzka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Róża Kucharczyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
| | - Artur Krężel
- Department of Chemical Biology, Faculty of Biotechnology, University of Wrocław, F. Joliot-Curie 14A, 50-383, Wrocław, Poland
- * E-mail: (AK); (WB)
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106, Warsaw, Poland
- * E-mail: (AK); (WB)
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31
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Hu J, Kholmukhamedov A, Lindsey CC, Beeson CC, Jaeschke H, Lemasters JJ. Translocation of iron from lysosomes to mitochondria during acetaminophen-induced hepatocellular injury: Protection by starch-desferal and minocycline. Free Radic Biol Med 2016; 97:418-426. [PMID: 27345134 PMCID: PMC4996678 DOI: 10.1016/j.freeradbiomed.2016.06.024] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 06/16/2016] [Accepted: 06/21/2016] [Indexed: 01/09/2023]
Abstract
Acetaminophen (APAP) overdose causes hepatotoxicity involving mitochondrial dysfunction and the mitochondrial permeability transition (MPT). Iron is a critical catalyst for ROS formation, and reactive oxygen species (ROS) play an important role in APAP-induced hepatotoxicity. Previous studies show that APAP disrupts lysosomes, which release ferrous iron (Fe(2+)) into the cytosol to trigger the MPT and cell killing. Here, our aim was to investigate whether iron released from lysosomes after APAP is then taken up into mitochondria via the mitochondrial electrogenic Ca(2+), Fe(2+) uniporter (MCFU) to cause mitochondrial dysfunction and cell death. Hepatocytes were isolated from fasted male C57BL/6 mice. Necrotic cell killing was assessed by propidium iodide fluorimetry. Mitochondrial membrane potential (ΔΨ) was visualized by confocal microscopy of rhodamine 123 (Rh123) and tetramethylrhodamine methylester (TMRM). Chelatable Fe(2+) was monitored by quenching of calcein (cytosol) and mitoferrofluor (MFF, mitochondria). ROS generation was monitored by confocal microscopy of MitoSox Red and plate reader fluorimetry of chloromethyldihydrodichlorofluorescein diacetate (cmH2DCF-DA). Administered 1h before APAP (10mM), the lysosomally targeted iron chelator, starch-desferal (1mM), and the MCFU inhibitors, Ru360 (100nM) and minocycline (4µM), decreased cell killing from 83% to 41%, 57% and 53%, respectively, after 10h. Progressive quenching of calcein and MFF began after ~4h, signifying increased cytosolic and mitochondrial chelatable Fe(2+). Mitochondria then depolarized after ~10h. Dipyridyl, a membrane-permeable iron chelator, dequenched calcein and MFF fluorescence after APAP. Starch-desferal, but not Ru360 and minocycline, suppressed cytosolic calcein quenching, whereas starch-desferal, Ru360 and minocycline all suppressed mitochondrial MFF quenching and mitochondrial depolarization. Starch-desferal, Ru360 and minocycline also each decreased ROS formation. Moreover, minocycline 1h after APAP decreased cell killing by half. In conclusion, release of Fe(2+) from lysosomes followed by uptake into mitochondria via MCFU occurs during APAP hepatotoxicity. Mitochondrial iron then catalyzes toxic hydroxyl radical formation, which triggers the MPT and cell killing. The efficacy of minocycline post-treatment shows minocycline as a possible therapeutic agent against APAP hepatotoxicity.
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Affiliation(s)
- Jiangting Hu
- Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC 29425, United States; Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, United States
| | - Andaleb Kholmukhamedov
- Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC 29425, United States; Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, United States
| | - Christopher C Lindsey
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, United States
| | - Craig C Beeson
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, United States
| | - Hartmut Jaeschke
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, KS 66160, United States
| | - John J Lemasters
- Center for Cell Death, Injury & Regeneration, Medical University of South Carolina, Charleston, SC 29425, United States; Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, United States; Department of Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, United States; Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, United States; Institute of Theoretical & Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russian Federation.
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Maldonado EN, DeHart DN, Patnaik J, Klatt SC, Gooz MB, Lemasters JJ. ATP/ADP Turnover and Import of Glycolytic ATP into Mitochondria in Cancer Cells Is Independent of the Adenine Nucleotide Translocator. J Biol Chem 2016; 291:19642-50. [PMID: 27458020 DOI: 10.1074/jbc.m116.734814] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 11/06/2022] Open
Abstract
Non-proliferating cells oxidize respiratory substrates in mitochondria to generate a protonmotive force (Δp) that drives ATP synthesis. The mitochondrial membrane potential (ΔΨ), a component of Δp, drives release of mitochondrial ATP(4-) in exchange for cytosolic ADP(3-) via the electrogenic adenine nucleotide translocator (ANT) located in the mitochondrial inner membrane, which leads to a high cytosolic ATP/ADP ratio up to >100-fold greater than matrix ATP/ADP. In rat hepatocytes, ANT inhibitors, bongkrekic acid (BA), and carboxyatractyloside (CAT), and the F1FO-ATP synthase inhibitor, oligomycin (OLIG), inhibited ureagenesis-induced respiration. However, in several cancer cell lines, OLIG but not BA and CAT inhibited respiration. In hepatocytes, respiratory inhibition did not collapse ΔΨ until OLIG, BA, or CAT was added. Similarly, in cancer cells OLIG and 2-deoxyglucose, a glycolytic inhibitor, depolarized mitochondria after respiratory inhibition, which showed that mitochondrial hydrolysis of glycolytic ATP maintained ΔΨ in the absence of respiration in all cell types studied. However in cancer cells, BA, CAT, and knockdown of the major ANT isoforms, ANT2 and ANT3, did not collapse ΔΨ after respiratory inhibition. These findings indicated that ANT was not mediating mitochondrial ATP/ADP exchange in cancer cells [corrected]. We propose that suppression of ANT contributes to low cytosolic ATP/ADP, activation of glycolysis, and a Warburg metabolic phenotype in proliferating cells.
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Affiliation(s)
- Eduardo N Maldonado
- From the Center for Cell Death, Injury, and Regeneration, Departments of Drug Discovery and Biomedical Sciences and the Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina 29425 and
| | - David N DeHart
- Departments of Drug Discovery and Biomedical Sciences and
| | - Jyoti Patnaik
- Departments of Drug Discovery and Biomedical Sciences and
| | - Sandra C Klatt
- Departments of Drug Discovery and Biomedical Sciences and
| | | | - John J Lemasters
- From the Center for Cell Death, Injury, and Regeneration, Departments of Drug Discovery and Biomedical Sciences and the Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina 29425 and Biochemistry and Molecular Biology, and the Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russian Federation 142290
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Weinberg JM, Bienholz A, Venkatachalam MA. The role of glycine in regulated cell death. Cell Mol Life Sci 2016; 73:2285-308. [PMID: 27066896 PMCID: PMC4955867 DOI: 10.1007/s00018-016-2201-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 03/18/2016] [Indexed: 01/22/2023]
Abstract
The cytoprotective effects of glycine against cell death have been recognized for over 28 years. They are expressed in multiple cell types and injury settings that lead to necrosis, but are still not widely appreciated or considered in the conceptualization of cell death pathways. In this paper, we review the available data on the expression of this phenomenon, its relationship to major pathophysiologic pathways that lead to cell death and immunomodulatory effects, the hypothesis that it involves suppression by glycine of the development of a hydrophilic death channel of molecular dimensions in the plasma membrane, and evidence for its impact on disease processes in vivo.
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Affiliation(s)
- Joel M Weinberg
- Division of Nephrology, Department of Internal Medicine, Veterans Affairs Ann Arbor Healthcare System and University of Michigan, Room 1560, MSRB II, Ann Arbor, MI, 48109-0676, USA.
| | - Anja Bienholz
- Department of Nephrology, University Duisburg-Essen, 45122, Essen, Germany
| | - M A Venkatachalam
- Department of Pathology, University of Texas Health Science Center, San Antonio, TX, 78234, USA
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Badr H, Kozai D, Sakaguchi R, Numata T, Mori Y. Different Contribution of Redox-Sensitive Transient Receptor Potential Channels to Acetaminophen-Induced Death of Human Hepatoma Cell Line. Front Pharmacol 2016; 7:19. [PMID: 26903865 PMCID: PMC4746322 DOI: 10.3389/fphar.2016.00019] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 01/21/2016] [Indexed: 01/30/2023] Open
Abstract
Acetaminophen (APAP) is a safe analgesic antipyretic drug at prescribed doses. Its overdose, however, can cause life-threatening liver damage. Though, involvement of oxidative stress is widely acknowledged in APAP-induced hepatocellular death, the mechanism of this increased oxidative stress and the associated alterations in Ca2+ homeostasis are still unclear. Among members of transient receptor potential (TRP) channels activated in response to oxidative stress, we here identify that redox-sensitive TRPV1, TRPC1, TRPM2, and TRPM7 channels underlie Ca2+ entry and downstream cellular damages induced by APAP in human hepatoma (HepG2) cells. Our data indicate that APAP treatment of HepG2 cells resulted in increased reactive oxygen species (ROS) production, glutathione (GSH) depletion, and Ca2+ entry leading to increased apoptotic cell death. These responses were significantly suppressed by pretreatment with the ROS scavengers N-acetyl-L-cysteine (NAC) and 4,5-dihydroxy-1,3-benzene disulfonic acid disodium salt monohydrate (Tiron), and also by preincubation of cells with the glutathione inducer Dimethylfumarate (DMF). TRP subtype-targeted pharmacological blockers and siRNAs strategy revealed that suppression of either TRPV1, TRPC1, TRPM2, or TRPM7 reduced APAP-induced ROS formation, Ca2+ influx, and cell death; the effects of suppression of TRPV1 or TRPC1, known to be activated by oxidative cysteine modifications, were stronger than those of TRPM2 or TRPM7. Interestingly, TRPV1 and TRPC1 were labeled by the cysteine-selective modification reagent, 5,5′-dithiobis (2-nitrobenzoic acid)-2biotin (DTNB-2Bio), and this was attenuated by pretreatment with APAP, suggesting that APAP and/or its oxidized metabolites act directly on the modification target cysteine residues of TRPV1 and TRPC1 proteins. In human liver tissue, TRPV1, TRPC1, TRPM2, and TRPM7 channels transcripts were localized mainly to hepatocytes and Kupffer cells. Our findings strongly suggest that APAP-induced Ca2+ entry and subsequent hepatocellular death are regulated by multiple redox-activated cation channels, among which TRPV1 and TRPC1 play a prominent role.
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Affiliation(s)
- Heba Badr
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University Kyoto, Japan
| | - Daisuke Kozai
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University Kyoto, Japan
| | - Reiko Sakaguchi
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto UniversityKyoto, Japan; World Premier International Research Initiative-Institute for Integrated Cell-Material Sciences, Kyoto UniversityKyoto, Japan
| | - Tomohiro Numata
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto UniversityKyoto, Japan; Laboratory of Environmental Systems Biology, Department of Technology and Ecology, Hall of Global Environmental Studies, Kyoto UniversityKyoto, Japan
| | - Yasuo Mori
- Laboratory of Molecular Biology, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto UniversityKyoto, Japan; World Premier International Research Initiative-Institute for Integrated Cell-Material Sciences, Kyoto UniversityKyoto, Japan; Laboratory of Environmental Systems Biology, Department of Technology and Ecology, Hall of Global Environmental Studies, Kyoto UniversityKyoto, Japan
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Mitochondrial Dysfunction and Autophagy in Hepatic Ischemia/Reperfusion Injury. BIOMED RESEARCH INTERNATIONAL 2015; 2015:183469. [PMID: 26770970 PMCID: PMC4684839 DOI: 10.1155/2015/183469] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 11/10/2015] [Accepted: 11/11/2015] [Indexed: 12/26/2022]
Abstract
Ischemia/reperfusion (I/R) injury remains a major complication of liver resection, transplantation, and hemorrhagic shock. Although the mechanisms that contribute to hepatic I/R are complex and diverse involving the interaction of cell injury in hepatocytes, immune cells, and endothelium, mitochondrial dysfunction is a cardinal event culminating in hepatic reperfusion injury. Mitochondrial autophagy, so-called mitophagy, is a key cellular process that regulates mitochondrial homeostasis and eliminates damaged mitochondria in a timely manner. Growing evidence accumulates that I/R injury is attributed to defective mitophagy. This review aims to summarize the current understanding of autophagy and its role in hepatic I/R injury and highlight the various therapeutic approaches that have been studied to ameliorate injury.
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Schäferling M. Nanoparticle-based luminescent probes for intracellular sensing and imaging of pH. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2015; 8:378-413. [PMID: 26395962 DOI: 10.1002/wnan.1366] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 07/06/2015] [Accepted: 07/22/2015] [Indexed: 12/13/2022]
Abstract
Fluorescence imaging microscopy is an essential tool in biomedical research. Meanwhile, various fluorescent probes are available for the staining of cells, cell membranes, and organelles. Though, to monitor intracellular processes and dysfunctions, probes that respond to ubiquitous chemical parameters determining the cellular function such as pH, pO2 , and Ca(2+) are required. This review is focused on the progress in the design, fabrication, and application of photoluminescent nanoprobes for sensing and imaging of pH in living cells. The advantages of using nanoprobes carrying fluorescent pH indicators compared to single molecule probes are discussed as well as their limitations due to the mostly lysosomal uptake by cells. Particular attention is paid to ratiometric dual wavelength nanosensors that enable intrinsic referenced measurements. Referencing and proper calibration procedures are basic prerequisites to carry out reliable quantitative pH determinations in complex samples such as living cells. A variety of examples will be presented that highlight the diverseness of nanocarrier materials (polymers, micelles, silica, quantum dots, carbon dots, gold, photon upconversion nanocrystals, or bacteriophages), fluorescent pH indicators for the weak acidic range, and referenced sensing mechanisms, that have been applied intracellularly up to now. WIREs Nanomed Nanobiotechnol 2016, 8:378-413. doi: 10.1002/wnan.1366 For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- Michael Schäferling
- Division 1.10 Biophotonics, Federal Institute for Materials Research and Testing, Berlin, Germany
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Visnagri A, Kandhare AD, Bodhankar SL. Renoprotective effect of berberine via intonation on apoptosis and mitochondrial-dependent pathway in renal ischemia reperfusion-induced mutilation. Ren Fail 2015; 37:482-93. [DOI: 10.3109/0886022x.2014.996843] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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Teoh NC, Ajamieh H, Wong HJ, Croft K, Mori T, Allison AC, Farrell GC. Microparticles mediate hepatic ischemia-reperfusion injury and are the targets of Diannexin (ASP8597). PLoS One 2014; 9:e104376. [PMID: 25222287 PMCID: PMC4164362 DOI: 10.1371/journal.pone.0104376] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 06/30/2014] [Indexed: 11/24/2022] Open
Abstract
Background & Aims Ischemia–reperfusion injury (IRI) can cause hepatic failure after liver surgery or transplantation. IRI causes oxidative stress, which injures sinusoidal endothelial cells (SECs), leading to recruitment and activation of Kupffer cells, platelets and microcirculatory impairment. We investigated whether injured SECs and other cell types release microparticles during post-ischemic reperfusion, and whether such microparticles have pro-inflammatory, platelet-activating and pro-injurious effects that could contribute to IRI pathogenesis. Methods C57BL6 mice underwent 60 min of partial hepatic ischemia followed by 15 min–24 hrs of reperfusion. We collected blood and liver samples, isolated circulating microparticles, and determined protein and lipid content. To establish mechanism for microparticle production, we subjected murine primary hepatocytes to hypoxia-reoxygenation. Because microparticles express everted phosphatidylserine residues that are the target of annexin V, we analyzed the effects of an annexin V-homodimer (Diannexin or ASP8597) on post-ischemia microparticle production and function. Results Microparticles were detected in the circulation 15–30 min after post-ischemic reperfusion, and contained markers of SECs, platelets, natural killer T cells, and CD8+ cells; 4 hrs later, they contained markers of macrophages. Microparticles contained F2-isoprostanes, indicating oxidative damage to membrane lipids. Injection of mice with TNF-α increased microparticle formation, whereas Diannexin substantially reduced microparticle release and prevented IRI. Hypoxia-re-oxygenation generated microparticles from primary hepatocytes by processes that involved oxidative stress. Exposing cultured hepatocytes to preparations of microparticles isolated from the circulation during IRI caused injury involving mitochondrial membrane permeability transition. Microparticles also activated platelets and induced neutrophil migration in vitro. The inflammatory properties of microparticles involved activation of NF-κB and JNK, increased expression of E-selectin, P-selectin, ICAM-1 and VCAM-1. All these processes were blocked by coating microparticles with Diannexin. Conclusions Following hepatic IRI, microparticles circulate and can be taken up by hepatocytes, where they activate signaling pathways that mediate inflammation and hepatocyte injury. Diannexin prevents microparticle formation and subsequent inflammation.
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Affiliation(s)
- Narci C. Teoh
- Australian National University Medical School at The Canberra Hospital, Canberra, ACT, Australia
| | - Hussam Ajamieh
- Australian National University Medical School at The Canberra Hospital, Canberra, ACT, Australia
| | - Heng Jian Wong
- Australian National University Medical School at The Canberra Hospital, Canberra, ACT, Australia
| | - Kevin Croft
- School of Medicine and Pharmacology, University of Western Australia, Perth, WA, Australia
| | - Trevor Mori
- School of Medicine and Pharmacology, University of Western Australia, Perth, WA, Australia
| | | | - Geoffrey C. Farrell
- Australian National University Medical School at The Canberra Hospital, Canberra, ACT, Australia
- * E-mail:
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WANG KUNPENG, BAI YU, WANG JIAN, ZHANG JINZHEN. Inhibitory effects of Schisandra chinensis on acetaminophen-induced hepatotoxicity. Mol Med Rep 2014; 9:1813-9. [DOI: 10.3892/mmr.2014.2004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 02/18/2014] [Indexed: 11/06/2022] Open
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Yun N, Cho HI, Lee SM. Impaired autophagy contributes to hepatocellular damage during ischemia/reperfusion: heme oxygenase-1 as a possible regulator. Free Radic Biol Med 2014; 68:168-77. [PMID: 24365205 DOI: 10.1016/j.freeradbiomed.2013.12.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 11/15/2013] [Accepted: 12/11/2013] [Indexed: 12/14/2022]
Abstract
Liver ischemia and reperfusion (I/R) injury is characterized by oxidative stress that is accompanied by alterations of the endogenous defensive system. Emerging evidence suggests a protective role for autophagy induced by multiple stressors including reactive oxygen species. Meanwhile, heme oxygenase-1 (HO-1) has long been implicated in cytoprotection against oxidative stress in vitro and in vivo. Therefore, we investigated the impact of autophagy in the pathogenesis of liver I/R and its molecular mechanisms, particularly its linkage to HO-1. By using transmission electron microscopic analysis and biochemical autophagic flux assays with microtubule-associated protein 1 light chain 3-II, and beclin-1, representative autophagy markers, and p62, a selective substrate for autophagy, we found that reperfusion reduced autophagy both in the rat liver and in primary cultured hepatocytes. When autophagy was further inhibited with chloroquine or wortmannin, I/R-induced hepatocellular injury was aggravated. While livers that underwent I/R showed increased levels of mammalian target of rapamaycin and calpain 1 and 2, inhibition of calpain 1 and 2 induced an autophagic response in hepatocytes subjected to hypoxia/reoxygenation. HO-1 increased autophagy, and HO-1 reduced I/R-induced calcium overload in hepatocytes and prevented calpain 2 activation both in vivo and in vitro. Taken together, these findings suggest that the impaired autophagy during liver I/R, which is mediated by calcium overload and calpain activation, contributes to hepatocellular damage and the HO-1 system protects the liver from I/R injury through enhancing autophagy.
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Affiliation(s)
- Nari Yun
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Hong-Ik Cho
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Sun-Mee Lee
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea.
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Carbamazepine suppresses calpain-mediated autophagy impairment after ischemia/reperfusion in mouse livers. Toxicol Appl Pharmacol 2013; 273:600-10. [PMID: 24126417 DOI: 10.1016/j.taap.2013.10.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 09/29/2013] [Accepted: 10/02/2013] [Indexed: 02/07/2023]
Abstract
Onset of the mitochondrial permeability transition (MPT) plays a causative role in ischemia/reperfusion (I/R) injury. Current therapeutic strategies for reducing reperfusion injury remain disappointing. Autophagy is a lysosome-mediated, catabolic process that timely eliminates abnormal or damaged cellular constituents and organelles such as dysfunctional mitochondria. I/R induces calcium overloading and calpain activation, leading to degradation of key autophagy-related proteins (Atg). Carbamazepine (CBZ), an FDA-approved anticonvulsant drug, has recently been reported to increase autophagy. We investigated the effects of CBZ on hepatic I/R injury. Hepatocytes and livers from male C57BL/6 mice were subjected to simulated in vitro, as well as in vivo I/R, respectively. Cell death, intracellular calcium, calpain activity, changes in autophagy-related proteins (Atg), autophagic flux, MPT and mitochondrial membrane potential after I/R were analyzed in the presence and absence of 20 μM CBZ. CBZ significantly increased hepatocyte viability after reperfusion. Confocal microscopy revealed that CBZ prevented calcium overloading, the onset of the MPT and mitochondrial depolarization. Immunoblotting and fluorometric analysis showed that CBZ blocked calpain activation, depletion of Atg7 and Beclin-1 and loss of autophagic flux after reperfusion. Intravital multiphoton imaging of anesthetized mice demonstrated that CBZ substantially reversed autophagic defects and mitochondrial dysfunction after I/R in vivo. In conclusion, CBZ prevents calcium overloading and calpain activation, which, in turn, suppresses Atg7 and Beclin-1 depletion, defective autophagy, onset of the MPT and cell death after I/R.
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Zhang X, Lemasters JJ. Translocation of iron from lysosomes to mitochondria during ischemia predisposes to injury after reperfusion in rat hepatocytes. Free Radic Biol Med 2013; 63:243-53. [PMID: 23665427 PMCID: PMC3932485 DOI: 10.1016/j.freeradbiomed.2013.05.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 04/22/2013] [Accepted: 05/01/2013] [Indexed: 12/24/2022]
Abstract
The mitochondrial permeability transition (MPT) initiated by reactive oxygen species (ROS) plays an essential role in ischemia-reperfusion (IR) injury. Iron is a critical catalyst for ROS formation, and intracellular chelatable iron promotes oxidative injury-induced and MPT-dependent cell death in hepatocytes. Accordingly, our aim was to investigate the role of chelatable iron in IR-induced ROS generation, MPT formation, and cell death in primary rat hepatocytes. To simulate IR, overnight-cultured hepatocytes were incubated anoxically at pH 6.2 for 4h and reoxygenated at pH 7.4. Chelatable Fe(2+), ROS, and mitochondrial membrane potential were monitored by confocal fluorescence microscopy of calcein, chloromethyldichlorofluorescein, and tetramethylrhodamine methyl ester, respectively. Cell killing was assessed by propidium iodide fluorimetry. Ischemia caused progressive quenching of cytosolic calcein by more than 90%, signifying increased chelatable Fe(2+). Desferal and starch-desferal 1h before ischemia suppressed calcein quenching. Ischemia also induced quenching and dequenching of calcein loaded into mitochondria and lysosomes, respectively. Desferal, starch-desferal, and the inhibitor of the mitochondrial Ca(2+) uniporter (MCU), Ru360, suppressed mitochondrial calcein quenching during ischemia. Desferal, starch-desferal, and Ru360 before ischemia also decreased mitochondrial ROS formation, MPT opening, and cell killing after reperfusion. These results indicate that lysosomes release chelatable Fe(2+) during ischemia, which is taken up into mitochondria by MCU. Increased mitochondrial iron then predisposes to ROS-dependent MPT opening and cell killing after reperfusion.
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Affiliation(s)
- Xun Zhang
- Center for Cell Death, Injury & Regeneration, Departments of Drug Discovery & Biomedical Sciences and Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - John J. Lemasters
- Center for Cell Death, Injury & Regeneration, Departments of Drug Discovery & Biomedical Sciences and Biochemistry & Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
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Schwartz J, Holmuhamedov E, Zhang X, Lovelace GL, Smith CD, Lemasters JJ. Minocycline and doxycycline, but not other tetracycline-derived compounds, protect liver cells from chemical hypoxia and ischemia/reperfusion injury by inhibition of the mitochondrial calcium uniporter. Toxicol Appl Pharmacol 2013; 273:172-9. [PMID: 24012766 DOI: 10.1016/j.taap.2013.08.027] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 08/23/2013] [Accepted: 08/27/2013] [Indexed: 02/02/2023]
Abstract
Minocycline, a tetracycline-derived compound, mitigates damage caused by ischemia/reperfusion (I/R) injury. Here, 19 tetracycline-derived compounds were screened in comparison to minocycline for their ability to protect hepatocytes against damage from chemical hypoxia and I/R injury. Cultured rat hepatocytes were incubated with 50μM of each tetracycline-derived compound 20 min prior to exposure to 500μM iodoacetic acid plus 1mM KCN (chemical hypoxia). In other experiments, hepatocytes were incubated in anoxic Krebs-Ringer-HEPES buffer at pH6.2 for 4h prior to reoxygenation at pH7.4 (simulated I/R). Tetracycline-derived compounds were added 20 min prior to reperfusion. Ca(2+) uptake was measured in isolated rat liver mitochondria incubated with Fluo-5N. Cell killing after 120 min of chemical hypoxia measured by propidium iodide (PI) fluorometry was 87%, which decreased to 28% and 42% with minocycline and doxycycline, respectively. After I/R, cell killing at 120 min decreased from 79% with vehicle to 43% and 49% with minocycline and doxycycline. No other tested compound decreased killing. Minocycline and doxycycline also inhibited mitochondrial Ca(2+) uptake and suppressed the Ca(2+)-induced mitochondrial permeability transition (MPT), the penultimate cause of cell death in reperfusion injury. Ru360, a specific inhibitor of the mitochondrial calcium uniporter (MCU), also decreased cell killing after hypoxia and I/R and blocked mitochondrial Ca(2+) uptake and the MPT. Other proposed mechanisms, including mitochondrial depolarization and matrix metalloprotease inhibition, could not account for cytoprotection. Taken together, these results indicate that minocycline and doxycycline are cytoprotective by way of inhibition of MCU.
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Affiliation(s)
- Justin Schwartz
- Department of Drug Discovery & Biomedical Sciences, Medical University of South Carolina, Charleston, SC, USA
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Sapalidis K, Papavramidis TS, Gialamas E, Deligiannidis N, Tzioufa V, Papavramidis S. The role of allopurinol's timing in the ischemia reperfusion injury of small intestine. J Emerg Trauma Shock 2013; 6:203-8. [PMID: 23960379 PMCID: PMC3746444 DOI: 10.4103/0974-2700.115346] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Accepted: 05/30/2013] [Indexed: 12/01/2022] Open
Abstract
INTRODUCTION Allopurinol acts protectively in the ischemia reperfusion injury of the small intestine. The aim of this experimental study is to define the ideal time of administration of allopurinol, in experimental models of ischemia/reperfusion. MATERIALS AND METHODS We used 46 rabbits that were divided into four groups. Group A was the control. In Group B allopurinol was administered 10 min before ischemia and in Group C 2 min before reperfusion. In Group D, allopurinol was administered before ischemia and before reperfusion in half doses. Blood samples were collected at three different moments: (t1) prior to ischemia, (t2) prior to reperfusion, and (t3) after the end of the reperfusion, in order to determine superoxide dismutase (SOD) and neopterin values. Specimens of the intestine were obtained for histological analysis and determination of malondialdehyde (MDA). RESULTS In Group A, mucosal lesions were more extensive compared to those of the other three groups. Similarly, MDA, SOD and neopterin values were significantly higher. On the contrary, Group D showed the mildest mucosal lesions, as well as the lowest MDA, SOD and neopterin values. Finally, the lesions and the above mentioned values were bigger in Group C than in Group D. CONCLUSIONS The administration of allopurinol attenuates the production and damage effect of free oxygen radicals during ischemia reperfusion of the small intestine, thus protecting the intestinal mucosa. Its maximum beneficial action is achieved when administered both before ischemia and before reperfusion of the small intestine.
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Affiliation(s)
- Konstantinos Sapalidis
- 3rd Department of Surgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Theodossis S Papavramidis
- 3rd Department of Surgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Eleftherios Gialamas
- 3rd Department of Surgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Nikolaos Deligiannidis
- 3rd Department of Surgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Valentini Tzioufa
- Department of Pathology, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Spiros Papavramidis
- 3rd Department of Surgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
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Fang H, Liu A, Dahmen U, Dirsch O. Dual role of chloroquine in liver ischemia reperfusion injury: reduction of liver damage in early phase, but aggravation in late phase. Cell Death Dis 2013; 4:e694. [PMID: 23807223 PMCID: PMC3702304 DOI: 10.1038/cddis.2013.225] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The anti-malaria drug chloroquine is well known as autophagy inhibitor. Chloroquine has also been used as anti-inflammatory drugs to treat inflammatory diseases. We hypothesized that chloroquine could have a dual effect in liver ischemia/reperfusion (I/R) injury: chloroquine on the one hand could protect the liver against I/R injury via inhibition of inflammatory response, but on the other hand could aggravate liver I/R injury through inhibition of autophagy. Rats (n=6 per group) were pre-treated with chloroquine (60 mg/kg, i.p.) 1 h before warm ischemia, and they were continuously subjected to a daily chloroquine injection for up to 2 days. Rats were killed 0.5, 6, 24 and 48 h after reperfusion. At the early phase (i.e., 0–6 h after reperfusion), chloroquine treatment ameliorated liver I/R injury, as indicated by lower serum aminotransferase levels, lower hepatic inflammatory cytokines and fewer histopathologic changes. In contrast, chloroquine worsened liver injury at the late phase of reperfusion (i.e., 24–48 h after reperfusion). The mechanism of protective action of chloroquine appeared to involve its ability to modulate mitogen-activated protein kinase activation, reduce high-mobility group box 1 release and inflammatory cytokines production, whereas chloroquine worsened liver injury via inhibition of autophagy and induction of hepatic apoptosis at the late phase. In conclusion, chloroquine prevents ischemic liver damage at the early phase, but aggravates liver damage at the late phase in liver I/R injury. This dual role of chloroquine should be considered when using chloroquine as an inhibitor of inflammation or autophagy in I/R injury.
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Affiliation(s)
- H Fang
- Department of Pathophysiology, Anhui Medical University, Hefei 230032, China
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Czaja MJ, Ding WX, Donohue TM, Friedman SL, Kim JS, Komatsu M, Lemasters JJ, Lemoine A, Lin JD, Ou JHJ, Perlmutter DH, Randall G, Ray RB, Tsung A, Yin XM. Functions of autophagy in normal and diseased liver. Autophagy 2013; 9:1131-58. [PMID: 23774882 DOI: 10.4161/auto.25063] [Citation(s) in RCA: 351] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Autophagy has emerged as a critical lysosomal pathway that maintains cell function and survival through the degradation of cellular components such as organelles and proteins. Investigations specifically employing the liver or hepatocytes as experimental models have contributed significantly to our current knowledge of autophagic regulation and function. The diverse cellular functions of autophagy, along with unique features of the liver and its principal cell type the hepatocyte, suggest that the liver is highly dependent on autophagy for both normal function and to prevent the development of disease states. However, instances have also been identified in which autophagy promotes pathological changes such as the development of hepatic fibrosis. Considerable evidence has accumulated that alterations in autophagy are an underlying mechanism of a number of common hepatic diseases including toxin-, drug- and ischemia/reperfusion-induced liver injury, fatty liver, viral hepatitis and hepatocellular carcinoma. This review summarizes recent advances in understanding the roles that autophagy plays in normal hepatic physiology and pathophysiology with the intent of furthering the development of autophagy-based therapies for human liver diseases.
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Affiliation(s)
- Mark J Czaja
- Department of Medicine; Marion Bessin Liver Research Center; Albert Einstein College of Medicine; Bronx, NY USA
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Ansley DM, Wang B. Oxidative stress and myocardial injury in the diabetic heart. J Pathol 2013; 229:232-41. [PMID: 23011912 DOI: 10.1002/path.4113] [Citation(s) in RCA: 162] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Revised: 09/13/2012] [Accepted: 09/14/2012] [Indexed: 12/14/2022]
Abstract
Reactive oxygen or nitrogen species play an integral role in both myocardial injury and repair. This dichotomy is differentiated at the level of species type, amount and duration of free radical generated. Homeostatic mechanisms designed to prevent free radical generation in the first instance, scavenge, or enzymatically convert them to less toxic forms and water, playing crucial roles in the maintenance of cellular structure and function. The outcome between functional recovery and dysfunction is dependent upon the inherent ability of these homeostatic antioxidant defences to withstand acute free radical generation, in the order of seconds to minutes. Alternatively, pre-existent antioxidant capacity (from intracellular and extracellular sources) may regulate the degree of free radical generation. This converts reactive oxygen and nitrogen species to the role of second messenger involved in cell signalling. The adaptive capacity of the cell is altered by the balance between death or survival signal converging at the level of the mitochondria, with distinct pathophysiological consequences that extends the period of injury from hours to days and weeks. Hyperglycaemia, hyperlipidaemia and insulin resistance enhance oxidative stress in the diabetic myocardium that cannot adapt to ischaemia-reperfusion. Altered glucose flux, mitochondrial derangements and nitric oxide synthase uncoupling in the presence of decreased antioxidant defence and impaired prosurvival cell signalling may render the diabetic myocardium more vulnerable to injury, remodelling and heart failure.
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Affiliation(s)
- David M Ansley
- Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, BC, Canada.
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Hausenloy DJ, Yellon DM. Myocardial ischemia-reperfusion injury: a neglected therapeutic target. J Clin Invest 2013; 123:92-100. [PMID: 23281415 DOI: 10.1172/jci62874] [Citation(s) in RCA: 1539] [Impact Index Per Article: 139.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Acute myocardial infarction (MI) is a major cause of death and disability worldwide. In patients with MI, the treatment of choice for reducing acute myocardial ischemic injury and limiting MI size is timely and effective myocardial reperfusion using either thombolytic therapy or primary percutaneous coronary intervention (PPCI). However, the process of reperfusion can itself induce cardiomyocyte death, known as myocardial reperfusion injury, for which there is still no effective therapy. A number of new therapeutic strategies currently under investigation for preventing myocardial reperfusion injury have the potential to improve clinical outcomes in patients with acute MI treated with PPCI.
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Affiliation(s)
- Derek J Hausenloy
- Hatter Cardiovascular Institute, University College London, 67 Chenies Mews, London WC1E 6HX, United Kingdom
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Pillai VC, Snyder RO, Gumaste U, Thekkumkara TJ, Mehvar R. Effects of transient overexpression or knockdown of cytochrome P450 reductase on reactive oxygen species generation and hypoxia reoxygenation injury in liver cells. Clin Exp Pharmacol Physiol 2012; 38:846-53. [PMID: 21973081 DOI: 10.1111/j.1440-1681.2011.05622.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
1. Literature data suggest that the electron-donating enzyme, cytochrome P450 reductase (CPR), might act as a source of reactive oxygen species (ROS). However, the role of CPR in pathophysiological conditions associated with oxidative stress is unknown. The aim of the present study was to study the role of CPR in the generation of ROS and cellular injury under basal conditions, and after simulated in vitro ischaemia-reperfusion (IR). 2. Plasmid DNA or siRNA approaches were used to transiently overexpress or knockdown the human CPR gene in rat liver epithelial (WB-F344) or human hepatoblastoma (HepG2) cells, respectively. The generation of ROS and/or cellular injury was then studied under the basal conditions and after simulated IR (4 h of ischaemia plus 30 min of reoxygenation). 3. Under the basal conditions, transient overexpression of CPR protein in WB-F344 cells caused a 90% increase in the CPR activity, which was associated with a 100% increase in the ROS production. In contrast, after simulated IR, a 2.5-fold higher CPR activity did not significantly affect the magnitude of ROS generation or cell death. Similarly, although the knockdown of CPR protein resulted in a significant reduction (∼30%) in the CPR activity, the ROS production was not substantially altered after simulated IR in HepG2 cells. 4. Our data suggest that CPR plays a major role in the ROS generation by liver cells under the basal conditions. However, the role of CPR in the ROS generation during simulated in vitro IR injury in these cells is minimal, if any.
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Affiliation(s)
- Venkateswaran C Pillai
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas 79106, USA
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Petrat F, Boengler K, Schulz R, de Groot H. Glycine, a simple physiological compound protecting by yet puzzling mechanism(s) against ischaemia-reperfusion injury: current knowledge. Br J Pharmacol 2012; 165:2059-72. [PMID: 22044190 DOI: 10.1111/j.1476-5381.2011.01711.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Ischaemia is amongst the leading causes of death. Despite this importance, there are only a few therapeutic approaches to protect from ischaemia-reperfusion injury (IRI). In experimental studies, the amino acid glycine effectively protected from IRI. In the prevention of IRI by glycine in cells and isolated perfused or cold-stored organs (tissues), direct cytoprotection plays a crucial role, most likely by prevention of the formation of pathological plasma membrane pores. Under in vivo conditions, the mechanism of protection by glycine is less clear, partly due to the physiological presence of the amino acid. Here, inhibition of the inflammatory response in the injured tissue is considered to contribute decisively to the glycine-induced reduction of IRI. However, attenuation of IRI recently achieved in experimental animals by low-dose glycine treatment regimens suggests additional/other (unknown) protective mechanisms. Despite the convincing experimental evidence and the large therapeutic width of glycine, there are only a few clinical trials on the protection from IRI by glycine with ambivalent results. Thus, both the mechanism(s) behind the protection of glycine against IRI in vivo and its true clinical potential remain to be addressed in future experimental studies/clinical trials.
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Affiliation(s)
- Frank Petrat
- Institut für Physiologische Chemie, Universitätsklinikum Essen, Essen, Germany
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