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Hao W, Jialong Z, Jiuzhi Y, Yang Y, Chongning L, Jincai L. ADP-ribosylation, a multifaceted modification: Functions and mechanisms in aging and aging-related diseases. Ageing Res Rev 2024; 98:102347. [PMID: 38815933 DOI: 10.1016/j.arr.2024.102347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 05/18/2024] [Accepted: 05/23/2024] [Indexed: 06/01/2024]
Abstract
Aging, a complex biological process, plays key roles the development of multiple disorders referred as aging-related diseases involving cardiovascular diseases, stroke, neurodegenerative diseases, cancers, lipid metabolism-related diseases. ADP-ribosylation is a reversible modification onto proteins and nucleic acids to alter their structures and/or functions. Growing evidence support the importance of ADP-ribosylation and ADP-ribosylation-associated enzymes in aging and age-related diseases. In this review, we summarized ADP-ribosylation-associated proteins including ADP-ribosyl transferases, the ADP-ribosyl hydrolyses and ADP-ribose binding domains. Furthermore, we outlined the latest knowledge about regulation of ADP-ribosylation in the pathogenesis and progression of main aging-related diseases, organism aging and cellular senescence, and we also speculated the underlying mechanisms to better disclose this novel molecular network. Moreover, we discussed current issues and provided an outlook for future research, aiming to revealing the unknown bio-properties of ADP-ribosylation, and establishing a novel therapeutic perspective in aging-related diseases and health aging via targeting ADP-ribosylation.
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Affiliation(s)
- Wu Hao
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Zhao Jialong
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Yuan Jiuzhi
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Yu Yang
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Lv Chongning
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China; Liaoning Provincial Key Laboratory of TCM Resources Conservation and Development, Shenyang Pharmaceutical University, Shenyang, China
| | - Lu Jincai
- College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China; Liaoning Provincial Key Laboratory of TCM Resources Conservation and Development, Shenyang Pharmaceutical University, Shenyang, China.
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Vancomycin-Associated Acute Kidney Injury: A Narrative Review from Pathophysiology to Clinical Application. Int J Mol Sci 2022; 23:ijms23042052. [PMID: 35216167 PMCID: PMC8877514 DOI: 10.3390/ijms23042052] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/10/2022] [Accepted: 02/11/2022] [Indexed: 12/12/2022] Open
Abstract
Vancomycin is the most frequently used antibiotic, accounting for up to 35% of hospitalized patients with infection, because of its optimal bactericidal effectiveness and relatively low price. Vancomycin-associated AKI (VA-AKI) is a clinically relevant but not yet clearly understood entity in critically ill patients. The current review comprehensively summarizes the pathophysiological mechanisms of, biomarkers for, preventive strategies for, and some crucial issues with VA-AKI. The pathological manifestations of VA-AKI include acute tubular necrosis, acute tubulointerstitial nephritis (ATIN), and intratubular crystal obstruction. The proposed pathological mechanisms of VA-AKI include oxidative stress and allergic reactions induced by vancomycin and vancomycin-associated tubular casts. Concomitant administration with other nephrotoxic antibiotics, such as piperacillin–tazobactam, high vancomycin doses, and intermittent infusion strategies compared to the continuous infusion are associated with a higher risk of VA-AKI. Several biomarkers could be applied to predict and diagnose VA-AKI. To date, no promising therapy is available. Oral steroids could be considered for patients with ATIN, whereas hemodialysis might be applied to remove vancomycin from the patient. In the future, disclosing more promising biomarkers that could precisely identify populations susceptible to VA-AKI and detect VA-AKI occurrence early on, and developing pharmacological agents that could prevent or treat VA-AKI, are the keys to improve the prognoses of patients with severe infection who probably need vancomycin therapy.
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Yang Y, Chen Z, Zhao X, Xie H, Du L, Gao H, Xie C. Mechanisms of Kaempferol in the treatment of diabetes: A comprehensive and latest review. Front Endocrinol (Lausanne) 2022; 13:990299. [PMID: 36157449 PMCID: PMC9490412 DOI: 10.3389/fendo.2022.990299] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 08/17/2022] [Indexed: 01/07/2023] Open
Abstract
Obesity-insulin resistance-β-cells apoptosis" is an important trilogy of the pathogenesis of type 2 diabetes. With the global pandemic of obesity and diabetes, continuous research and development of new drugs focuses on the prevention of the pathological progress of these diseases. According to a recent study, the natural product kaempferol has excellent antidiabetic effects. Therefore, this review comprehensively summarized the frontier studies and pharmacological mechanisms of kaempferol in the treatment of diabetes. The successful research and development of kaempferol may yield a significant leap in the treatment of diabetes and its complications.
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Affiliation(s)
- Yan Yang
- Hospital of Chengdu, University of Traditional Chinese Medicine, Chengdu, China
| | - Zhengtao Chen
- Hospital of Chengdu, University of Traditional Chinese Medicine, Chengdu, China
| | - Xiaoyan Zhao
- Hospital of Chengdu, University of Traditional Chinese Medicine, Chengdu, China
| | - Hongyan Xie
- Hospital of Chengdu, University of Traditional Chinese Medicine, Chengdu, China
| | - Lian Du
- School of Basic Medical Sciences, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Hong Gao
- Hospital of Chengdu, University of Traditional Chinese Medicine, Chengdu, China
- *Correspondence: Hong Gao, ; Chunguang Xie,
| | - Chunguang Xie
- Hospital of Chengdu, University of Traditional Chinese Medicine, Chengdu, China
- *Correspondence: Hong Gao, ; Chunguang Xie,
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PARPs in lipid metabolism and related diseases. Prog Lipid Res 2021; 84:101117. [PMID: 34450194 DOI: 10.1016/j.plipres.2021.101117] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 08/10/2021] [Accepted: 08/18/2021] [Indexed: 12/28/2022]
Abstract
PARPs and tankyrases (TNKS) represent a family of 17 proteins. PARPs and tankyrases were originally identified as DNA repair factors, nevertheless, recent advances have shed light on their role in lipid metabolism. To date, PARP1, PARP2, PARP3, tankyrases, PARP9, PARP10, PARP14 were reported to have multi-pronged connections to lipid metabolism. The activity of PARP enzymes is fine-tuned by a set of cholesterol-based compounds as oxidized cholesterol derivatives, steroid hormones or bile acids. In turn, PARPs modulate several key processes of lipid homeostasis (lipotoxicity, fatty acid and steroid biosynthesis, lipoprotein homeostasis, fatty acid oxidation, etc.). PARPs are also cofactors of lipid-responsive nuclear receptors and transcription factors through which PARPs regulate lipid metabolism and lipid homeostasis. PARP activation often represents a disruptive signal to (lipid) metabolism, and PARP-dependent changes to lipid metabolism have pathophysiological role in the development of hyperlipidemia, obesity, alcoholic and non-alcoholic fatty liver disease, type II diabetes and its complications, atherosclerosis, cardiovascular aging and skin pathologies, just to name a few. In this synopsis we will review the evidence supporting the beneficial effects of pharmacological PARP inhibitors in these diseases/pathologies and propose repurposing PARP inhibitors already available for the treatment of various malignancies.
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The Mechanism of Drug Nephrotoxicity and the Methods for Preventing Kidney Damage. Int J Mol Sci 2021; 22:ijms22116109. [PMID: 34204029 PMCID: PMC8201165 DOI: 10.3390/ijms22116109] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 06/03/2021] [Accepted: 06/05/2021] [Indexed: 12/11/2022] Open
Abstract
Acute kidney injury (AKI) is a global health challenge of vast proportions, as approx. 13.3% of people worldwide are affected annually. The pathophysiology of AKI is very complex, but its main causes are sepsis, ischemia, and nephrotoxicity. Nephrotoxicity is mainly associated with the use of drugs. Drug-induced AKI accounts for 19-26% of all hospitalized cases. Drug-induced nephrotoxicity develops according to one of the three mechanisms: (1) proximal tubular injury and acute tubular necrosis (ATN) (a dose-dependent mechanism), where the cause is related to apical contact with drugs or their metabolites, the transport of drugs and their metabolites from the apical surface, and the secretion of drugs from the basolateral surface into the tubular lumen; (2) tubular obstruction by crystals or casts containing drugs and their metabolites (a dose-dependent mechanism); (3) interstitial nephritis induced by drugs and their metabolites (a dose-independent mechanism). In this article, the mechanisms of the individual types of injury will be described. Specific groups of drugs will be linked to specific injuries. Additionally, the risk factors for the development of AKI and the methods for preventing and/or treating the condition will be discussed.
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Gong CM, Xu YF, Liang XS, Mo JL, Zhuang ZX. PARP-1 overexpression does not protect HaCaT cells from DNA damage induced by SiO 2 nanoparticles. Toxicol Res (Camb) 2021; 10:399-408. [PMID: 34141153 DOI: 10.1093/toxres/tfaa110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 12/04/2020] [Accepted: 12/21/2020] [Indexed: 11/12/2022] Open
Abstract
Nano-SiO2 is increasingly used in diagnostic and biomedical research because of its ease of production and relatively low cost and which is generally regarded as safe and has been approved for use as a food or animal feed ingredient. Although recent literature reveals that nano-SiO2 may present toxicity and DNA damage, however, the underlying mechanism remains poorly understood. Since in previous studies, we found that nano-SiO2 treatment down-regulated the expression of the poly(ADP-ribose) polymerases-1 (PARP-1), a pivotal DNA repair gene, in human HaCaT cells and PAPR-1 knockdown can aggravate DNA damage induced by nano-SiO2. Therefore, we speculate whether PARP-1 overexpression can protect DNA from damage induced by nano-SiO2. However, our data demonstrated that overexpression of PARP-1 in HaCaT cells slightly enhanced the cellular proliferation of undamaged cells, when compared with both empty vector control cells and parental cells, but had drastic consequences for cells treated with nano-SiO2. The PARP-1 overtransfected cells were sensitized to the cytotoxic effects and DNA damage of nano-SiO2 compared with control parental cells. Meanwhile, flow cytometric analysis of nano-SiO2 stimulated poly(ADP-ribose) synthesis revealed consistently larger fractions of cells positive for this polymer in the PARP-1 overexpression cells than in control clones. Combining our previous research on PARP-1 knockdown HaCaT cells, we hypothesize that an optimal level of cellular poly(ADP-ribose) accumulation exists for the cellular recovery from DNA damage.
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Affiliation(s)
- Chun-Mei Gong
- Shenzhen Center for Chronic Disease Control, 2021 Buxin Road, Shenzhen 518020, Luohu, PR China
| | - Yuan-Fei Xu
- Shenzhen Center for Chronic Disease Control, 2021 Buxin Road, Shenzhen 518020, Luohu, PR China
| | - Xiong-Shun Liang
- Shenzhen Center for Chronic Disease Control, 2021 Buxin Road, Shenzhen 518020, Luohu, PR China
| | - Jun-Luan Mo
- Shenzhen Center for Chronic Disease Control, 2021 Buxin Road, Shenzhen 518020, Luohu, PR China
| | - Zhi-Xiong Zhuang
- Shenzhen Center for Disease Control and Prevention, Longyuan Road 8, Shenzhen 518055, Nanshan, PR China
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7
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Ma S, Zhao X, Zhang C, Sun P, Li Y, Lin X, Sun T, Fu Z. Ozone Exposure Induces Metabolic Disorders and NAD+ Depletion Through PARP1 Activation in Spinal Cord Neurons. Front Med (Lausanne) 2021; 7:617321. [PMID: 33425964 PMCID: PMC7789457 DOI: 10.3389/fmed.2020.617321] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 11/23/2020] [Indexed: 12/03/2022] Open
Abstract
Background and Objective: Ozone therapy has shown therapeutic efficacy in different disorders particularly low back pain (LBP). However, ozone therapy has been associated with toxic effects on the respiratory, endocrine, cardiovascular systems as well as nervous system because of its strong oxidizing capacity. Recent studies have reported possible associations between ozone exposure and metabolic disorders, but the findings are controversial and little is known on the mechanisms of action. This study aims to investigate the cytotoxic effects of ozone exposure and possible mechanism of action in the animal model. Methods: Wistar neonate rats with the age of 24 h after birth were sacrificed by cervical dislocation under general anesthesia, then immersed in 75% alcohol and iodophor for 5 min, respectively. The spinal cord was isolated and cut to samples of ~1 mm3 and prepared for further experiments. The spinal cord neurons (SCNs) were exposed to ozone at different concentrations and then cultured in 96-well plates with glass bottom for 7 days. The cell viability, ATP levels and the NAD+ concentration were determined and compared between the different experimental groups and the control group. Results: Analyses of the data by non-targeted liquid chromatography-mass spectrometry (LC-MS) analysis determined the metabolic disorder in SCNs following the ozone exposure. Moreover, our assessments showed that ozone exposure resulted in DNA damage, poly (ADP)-ribose polymerase-1 (PARP1) excessive activation, nicotinamide adenine dinucleotide (NAD+) depletion and decrease of ATP level in SCNs. The PARP1 inhibitor can inhibit the cytotoxic effect of ozone to SCNs without inhibiting the activation of AMP-activated protein kinase (AMPK). Our findings revealed that the cytotoxic effects of ozone to SCNs might be mediated by excessive PARP1 activation and subsequent NAD+ depletion. Moreover, using PARP1 inhibitor can protect SCNs from cytotoxic effects of ozone by preventing NAD+ depletion during ozone exposure. Conclusion: Ozone exposure seems to induce metabolic disorders and NAD+ depletion through excessive PARP1 activation in SCNs.
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Affiliation(s)
- Shulin Ma
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Xu Zhao
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Cong Zhang
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Panpan Sun
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Yun Li
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Xiaowen Lin
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Tao Sun
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Zhijian Fu
- Department of Pain Management, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China.,Department of Pain Management, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
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Curtin NJ, Szabo C. Poly(ADP-ribose) polymerase inhibition: past, present and future. Nat Rev Drug Discov 2020; 19:711-736. [PMID: 32884152 DOI: 10.1038/s41573-020-0076-6] [Citation(s) in RCA: 264] [Impact Index Per Article: 66.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2020] [Indexed: 12/11/2022]
Abstract
The process of poly(ADP-ribosyl)ation and the major enzyme that catalyses this reaction, poly(ADP-ribose) polymerase 1 (PARP1), were discovered more than 50 years ago. Since then, advances in our understanding of the roles of PARP1 in cellular processes such as DNA repair, gene transcription and cell death have allowed the investigation of therapeutic PARP inhibition for a variety of diseases - particularly cancers in which defects in DNA repair pathways make tumour cells highly sensitive to the inhibition of PARP activity. Efforts to identify and evaluate potent PARP inhibitors have so far led to the regulatory approval of four PARP inhibitors for the treatment of several types of cancer, and PARP inhibitors have also shown therapeutic potential in treating non-oncological diseases. This Review provides a timeline of PARP biology and medicinal chemistry, summarizes the pathophysiological processes in which PARP plays a role and highlights key opportunities and challenges in the field, such as counteracting PARP inhibitor resistance during cancer therapy and repurposing PARP inhibitors for the treatment of non-oncological diseases.
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Affiliation(s)
- Nicola J Curtin
- Translational and Clinical Research Institute, Newcastle University Centre for Cancer, Faculty of Medical Sciences, University of Newcastle, Newcastle upon Tyne, UK.
| | - Csaba Szabo
- Chair of Pharmacology, Section of Science and Medicine, University of Fribourg, Fribourg, Switzerland.
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Pais GM, Liu J, Zepcan S, Avedissian SN, Rhodes NJ, Downes KJ, Moorthy GS, Scheetz MH. Vancomycin-Induced Kidney Injury: Animal Models of Toxicodynamics, Mechanisms of Injury, Human Translation, and Potential Strategies for Prevention. Pharmacotherapy 2020; 40:438-454. [PMID: 32239518 PMCID: PMC7331087 DOI: 10.1002/phar.2388] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 02/21/2020] [Accepted: 03/02/2020] [Indexed: 12/13/2022]
Abstract
Vancomycin is a recommended therapy in multiple national guidelines. Despite the common use, there is a poor understanding of the mechanistic drivers and potential modifiers of vancomycin-mediated kidney injury. In this review, historic and contemporary rates of vancomycin-induced kidney injury (VIKI) are described, and toxicodynamic models and mechanisms of toxicity from preclinical studies are reviewed. Aside from known clinical covariates that worsen VIKI, preclinical models have demonstrated that various factors impact VIKI, including dose, route of administration, and thresholds for pharmacokinetic parameters. The degree of acute kidney injury (AKI) is greatest with the intravenous route and higher doses that produce larger maximal concentrations and areas under the concentration curve. Troughs (i.e., minimum concentrations) have less of an impact. Mechanistically, preclinical studies have identified that VIKI is a result of drug accumulation in proximal tubule cells, which triggers cellular oxidative stress and apoptosis. Yet, there are several gaps in the knowledge that may represent viable targets to make vancomycin therapy less toxic. Potential strategies include prolonging infusions and lowering maximal concentrations, administration of antioxidants, administering agents that decrease cellular accumulation, and reformulating vancomycin to alter the renal clearance mechanism. Based on preclinical models and mechanisms of toxicity, we propose potential strategies to lessen VIKI.
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Affiliation(s)
- Gwendolyn M. Pais
- Department of Pharmacy Practice, Chicago College of Pharmacy, Midwestern University, Downers Grove, Illinois
- Pharmacometrics Center of Excellence, Midwestern University Chicago College of Pharmacy, Downers Grove, Illinois
| | - Jiajun Liu
- Department of Pharmacy Practice, Chicago College of Pharmacy, Midwestern University, Downers Grove, Illinois
- Pharmacometrics Center of Excellence, Midwestern University Chicago College of Pharmacy, Downers Grove, Illinois
| | - Sanja Zepcan
- Chicago College of Pharmacy, Midwestern University, Downers Grove, Illinois
| | - Sean N. Avedissian
- Antiviral Pharmacology Laboratory, University of Nebraska Medical Center (UNMC) Center for Drug Discovery, UNMC, Omaha, Nebraska
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska
| | - Nathaniel J. Rhodes
- Department of Pharmacy Practice, Chicago College of Pharmacy, Midwestern University, Downers Grove, Illinois
- Pharmacometrics Center of Excellence, Midwestern University Chicago College of Pharmacy, Downers Grove, Illinois
| | - Kevin J. Downes
- Division of Infectious Diseases, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
- Department of Pediatrics, The University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Ganesh S. Moorthy
- Division of Critical Care, Department of Anesthesiology and Critical Care, The University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Marc H. Scheetz
- Department of Pharmacy Practice, Chicago College of Pharmacy, Midwestern University, Downers Grove, Illinois
- Pharmacometrics Center of Excellence, Midwestern University Chicago College of Pharmacy, Downers Grove, Illinois
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10
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Stringer JM, Winship A, Liew SH, Hutt K. The capacity of oocytes for DNA repair. Cell Mol Life Sci 2018; 75:2777-2792. [PMID: 29748894 PMCID: PMC11105623 DOI: 10.1007/s00018-018-2833-9] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 03/27/2018] [Accepted: 05/02/2018] [Indexed: 12/18/2022]
Abstract
Female fertility and offspring health are critically dependent on the maintenance of an adequate supply of high-quality oocytes. Like somatic cells, oocytes are subject to a variety of different types of DNA damage arising from endogenous cellular processes and exposure to exogenous genotoxic stressors. While the repair of intentionally induced DNA double strand breaks in gametes during meiotic recombination is well characterised, less is known about the ability of oocytes to repair pathological DNA damage and the relative contribution of DNA repair to oocyte quality is not well defined. This review will discuss emerging data suggesting that oocytes are in fact capable of efficient DNA repair and that DNA repair may be an important mechanism for ensuring female fertility, as well as the transmission of high-quality genetic material to subsequent generations.
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Affiliation(s)
- Jessica M Stringer
- Ovarian Biology Laboratory, Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Amy Winship
- Ovarian Biology Laboratory, Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Seng H Liew
- Ovarian Biology Laboratory, Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Karla Hutt
- Ovarian Biology Laboratory, Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia.
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Bruni A, Bornstein S, Linkermann A, Shapiro AMJ. Regulated Cell Death Seen through the Lens of Islet Transplantation. Cell Transplant 2018; 27:890-901. [PMID: 29845882 PMCID: PMC6050903 DOI: 10.1177/0963689718766323] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Clinical islet transplantation effectively restores euglycemia and corrects glycosylated
hemoglobin in labile type 1 diabetes mellitus (T1DM). Despite marked improvements in islet
transplantation outcomes, acute islet cell death remains a substantial obstacle that
compromises long-term engraftment outcomes. Multiple organ donors are routinely required
to achieve insulin independence. Therapeutic agents that ameliorate cell death and/or
control injury-related inflammatory cascades offer potential to improve islet transplant
success. Apoptotic cell death has been identified as a major contributor to cellular
demise and therapeutic strategies that subvert initiation and consequences of apoptotic
cell death have shown promise in pre-clinical models. Indeed, in numerous pathologies and
diseases apoptosis has been the most extensively described form of regulated cell death.
However, recent identification of novel, alternative regulated cell death pathways in
other disease states and solid organ transplantation suggest that these additional
pathways may also have substantial relevance in islet transplantation. These regulated,
non-apoptotic cell death pathways exhibit distinct biochemical characteristics but have
yet to be fully characterized within islet transplantation. We review herein the various
regulated cell death pathways and highlight their relative potential contributions to
islet viability, engraftment failure and islet dysfunction.
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Affiliation(s)
- Antonio Bruni
- 1 Clinical Islet Transplant Program, Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada.,2 Department of Surgery, University of Alberta, Edmonton, AB, Canada
| | - Stefan Bornstein
- 3 Division of Nephrology, Medical Clinic 3, University Hospital Carl Gustav Carus, Technical University Dresden, Dresden, Germany
| | - Andreas Linkermann
- 3 Division of Nephrology, Medical Clinic 3, University Hospital Carl Gustav Carus, Technical University Dresden, Dresden, Germany
| | - A M James Shapiro
- 1 Clinical Islet Transplant Program, Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada.,2 Department of Surgery, University of Alberta, Edmonton, AB, Canada
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Narayanan S, Loganathan G, Dhanasekaran M, Tucker W, Patel A, Subhashree V, Mokshagundam S, Hughes MG, Williams SK, Balamurugan AN. Intra-islet endothelial cell and β-cell crosstalk: Implication for islet cell transplantation. World J Transplant 2017; 7:117-128. [PMID: 28507914 PMCID: PMC5409911 DOI: 10.5500/wjt.v7.i2.117] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 02/28/2017] [Accepted: 03/24/2017] [Indexed: 02/05/2023] Open
Abstract
The intra-islet microvasculature is a critical interface between the blood and islet endocrine cells governing a number of cellular and pathophysiological processes associated with the pancreatic tissue. A growing body of evidence indicates a strong functional and physical interdependency of β-cells with endothelial cells (ECs), the building blocks of islet microvasculature. Intra-islet ECs, actively regulate vascular permeability and appear to play a role in fine-tuning blood glucose sensing and regulation. These cells also tend to behave as “guardians”, controlling the expression and movement of a number of important immune mediators, thereby strongly contributing to the physiology of islets. This review will focus on the molecular signalling and crosstalk between the intra-islet ECs and β-cells and how their relationship can be a potential target for intervention strategies in islet pathology and islet transplantation.
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13
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Zhao Q, Du Q, Wei F, Xie J, Ma X. An Infectious Disease-Associated Il12b Polymorphism Regulates IL-12/23 p40 Transcription Involving Poly(ADP-Ribose) Polymerase 1. THE JOURNAL OF IMMUNOLOGY 2017; 198:2935-2942. [PMID: 28219892 DOI: 10.4049/jimmunol.1601894] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 01/23/2017] [Indexed: 11/19/2022]
Abstract
IL-12 and IL-23 are important host defense factors produced by APCs against certain intracellular and extracellular pathogens. Their dysregulation has also been implicated in several autoimmune diseases. The nucleotide polymorphism in the promoter region of Il12b (rs41292470 consisting of the long or short allele) encoding the shared subunit of IL-12 and IL-23, p40, has been reported to associate with susceptibility to infectious diseases and autoimmune disorders. How these genetic variants impact Il12b expression at the molecular level was unclear. We established an Il12b promoter-luciferase reporter system containing the long or short allele driving the reporter gene expression and found that the long allele (infection-resistant) displayed ∼2-fold higher transcriptional activity than the short allele (infection-susceptible), associated with a selective and differential nuclear binding activity to the two alleles in activated macrophages. DNA pull-down assays coupled with mass spectrometry analyses identified the specific DNA binding activity as poly(ADP-ribose) polymerase 1 (PARP-1). Small hairpin RNA-mediated knockdown of the endogenous PARP-1 expression resulted in reduced p40 mRNA expression and Il12b promoter activity. Bone marrow-derived macrophages from PARP-1-deficient mice had decreased p40 expression at both mRNA and protein levels. Furthermore, selective PARP-1 inhibitors resulted in impaired production of IL-12p40 and IL-23 in bone-marrow derived macrophages and PBMCs. Chromatin immunoprecipitation assay revealed that PARP-1 could bind specifically to Il12b in LPS-stimulated macrophages. Our study opens the way for further elucidating the molecular mechanism whereby allele-specific immune responses to foreign and self-antigens mediated by IL-12/IL-23 are controlled in an individually variable manner.
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Affiliation(s)
- Quanju Zhao
- State Key Laboratory of Microbial Metabolism, Sheng Yushou Center of Cell Biology and Immunology, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Qinglin Du
- State Key Laboratory of Microbial Metabolism, Sheng Yushou Center of Cell Biology and Immunology, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Fang Wei
- State Key Laboratory of Microbial Metabolism, Sheng Yushou Center of Cell Biology and Immunology, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jianping Xie
- State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Institute of Modern Biopharmaceuticals, Southwest University, Chongqing 400715, China; and
| | - Xiaojing Ma
- State Key Laboratory of Microbial Metabolism, Sheng Yushou Center of Cell Biology and Immunology, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China; .,Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY 10065
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14
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Wang Z, Kang J, Deng X, Guo B, Wu B, Fan Y. Knockdown of GATAD2A suppresses cell proliferation in thyroid cancer in vitro. Oncol Rep 2017; 37:2147-2152. [PMID: 28260108 DOI: 10.3892/or.2017.5436] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 01/04/2017] [Indexed: 11/05/2022] Open
Abstract
GATAD2A (GATA zinc finger domain containing 2A), is a subunit of NuRP (nucleosome remodeling and histone deacetylation) which plays key roles in tumor growth inhibition and embryonic development. However, its role in thyroid cancer remains unclear. In our study, we established two thyroid cancer cell lines by lentivirus-delivered short hairpin (shRNA) to knockdown the expression of GATAD2A. Then loss-of-function assays indicated that knockdown of GATAD2A decreased the ability of cell proliferation and colony formation in thyroid cancer cells by MTT and colony formation assay, respectively. Moreover, cell cycle assay by flow cytometry revealed that the percentage of cells in G0/G1 phase was significantly decreased in GATAD2A knockdown cells accompanied by increase of cells in G2/M phase. Furthermore, inhibition of GATAD2A promoted cell apoptosis via elevating the expression of caspase-3 and PARP cleavage using Annexin V/7-AAD double staining and western blotting. In conclusion, GATAD2A is an essential factor in thyroid cancer cell growth and apoptosis, and may be a potential therapeutic biomarker in thyroid cancer.
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Affiliation(s)
- Zongping Wang
- Department of General Surgery, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, P.R. China
| | - Jie Kang
- Department of General Surgery, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, P.R. China
| | - Xianzhao Deng
- Department of General Surgery, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, P.R. China
| | - Bomin Guo
- Department of General Surgery, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, P.R. China
| | - Bo Wu
- Department of General Surgery, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, P.R. China
| | - Youben Fan
- Department of General Surgery, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, P.R. China
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15
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Oláh G, Szczesny B, Brunyánszki A, López-García IA, Gerö D, Radák Z, Szabo C. Differentiation-Associated Downregulation of Poly(ADP-Ribose) Polymerase-1 Expression in Myoblasts Serves to Increase Their Resistance to Oxidative Stress. PLoS One 2015. [PMID: 26218895 PMCID: PMC4517814 DOI: 10.1371/journal.pone.0134227] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Poly(ADP-ribose) polymerase 1 (PARP-1), the major isoform of the poly (ADP-ribose) polymerase family, is a constitutive nuclear and mitochondrial protein with well-recognized roles in various essential cellular functions such as DNA repair, signal transduction, apoptosis, as well as in a variety of pathophysiological conditions including sepsis, diabetes and cancer. Activation of PARP-1 in response to oxidative stress catalyzes the covalent attachment of the poly (ADP-ribose) (PAR) groups on itself and other acceptor proteins, utilizing NAD+ as a substrate. Overactivation of PARP-1 depletes intracellular NAD+ influencing mitochondrial electron transport, cellular ATP generation and, if persistent, can result in necrotic cell death. Due to their high metabolic activity, skeletal muscle cells are particularly exposed to constant oxidative stress insults. In this study, we investigated the role of PARP-1 in a well-defined model of murine skeletal muscle differentiation (C2C12) and compare the responses to oxidative stress of undifferentiated myoblasts and differentiated myotubes. We observed a marked reduction of PARP-1 expression as myoblasts differentiated into myotubes. This alteration correlated with an increased resistance to oxidative stress of the myotubes, as measured by MTT and LDH assays. Mitochondrial function, assessed by measuring mitochondrial membrane potential, was preserved under oxidative stress in myotubes compared to myoblasts. Moreover, basal respiration, ATP synthesis, and the maximal respiratory capacity of mitochondria were higher in myotubes than in myoblasts. Inhibition of the catalytic activity of PARP-1 by PJ34 (a phenanthridinone PARP inhibitor) exerted greater protective effects in undifferentiated myoblasts than in differentiated myotubes. The above observations in C2C12 cells were also confirmed in a rat-derived skeletal muscle cell line (L6). Forced overexpression of PARP1 in C2C12 myotubes sensitized the cells to oxidant-induced injury. Taken together, our data indicate that the reduction of PARP-1 expression during the process of the skeletal muscle differentiation serves as a protective mechanism to maintain the cellular functions of skeletal muscle during oxidative stress.
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Affiliation(s)
- Gábor Oláh
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, United States of America
| | - Bartosz Szczesny
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, United States of America
- Shriners Hospital for Children, Galveston, TX, United States of America
| | - Attila Brunyánszki
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, United States of America
| | - Isabel A. López-García
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, United States of America
| | - Domokos Gerö
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, United States of America
| | - Zsolt Radák
- Faculty of Physical Education and Sport Sciences, Semmelweis University, Alkotás Str. 44, Budapest, Hungary
| | - Csaba Szabo
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, United States of America
- Shriners Hospital for Children, Galveston, TX, United States of America
- * E-mail:
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16
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Wu Y, Chen Y, Wu Q, Jia L, Du X. Minocycline inhibits PARP‑1 expression and decreases apoptosis in diabetic retinopathy. Mol Med Rep 2015; 12:4887-94. [PMID: 26165350 PMCID: PMC4581760 DOI: 10.3892/mmr.2015.4064] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Accepted: 06/03/2015] [Indexed: 01/30/2023] Open
Abstract
The present study aimed to investigate the mechanism underlying the effects of minocycline on diabetic retinopathy-associated cellular apoptosis. A total of 40 Sprague Dawley (SD) rats were used as a diabetic retinopathy model following injection with streptozotocin. Among the 34 rats in which the diabetes model was successfully established, 24 rats were divided into two experimental groups: I and II (T1 and T2, respectively), and orally administered with various doses of minocycline. The remaining 10 rats served as the diabetic retinopathy control group. An additional group of 10 healthy SD rats with comparable weight served as normal controls. The rats in T1 and T2 groups were treated daily for eight consecutive weeks with minocycline at a dose of 2.5 mg/kg and 5 mg/kg, respectively. The mRNA expression levels of poly (ADP-ribose) polymerase-1 (PARP-1) were subsequently measured by reverse transcription-quantitative polymerase chain reaction, and the protein expression levels of poly-ADP-ribose were measured by western blot analysis and immunohistochemistry. Retinal morphology was observed following hematoxylin and eosin staining, and retinal cell apoptosis was measured by terminal deoxynucleotidyl transferase dUTP nick end labeling and caspase-3 activity assays. The amplitudes of the electroretinogram (ERG) b-wave and oscillary potentials (OPs) were measured using visual electrophysiology, and compared among the four groups. The results of the present study demonstrated that in the diabetic rats, retinal PARP-1 gene expression was markedly upregulated, the number of apoptotic cells and the activity levels of caspase-3 were increased, and the amplitude of the ERG b-wave and the OPs were markedly lower as compared with the normal rats. Following treatment with minocycline, the abnormal expression of PARP-1 in the retina was inhibited, and cellular apoptosis was decreased. In conclusion, the results of the present study suggest that PARP-1 is involved in the development of diabetic retinopathy, and minocycline is able to inhibit PARP-1 expression and decrease cellular apoptosis, suggesting that minocycline may prove to be a promising drug for the treatment of diabetic retinopathy.
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Affiliation(s)
- Ying Wu
- Department of Ultrasound, Shanghai First People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200080, P.R. China
| | - Yongdong Chen
- Department of Ophthalmology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 200233, P.R. China
| | - Qiang Wu
- Department of Ophthalmology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 200233, P.R. China
| | - Lili Jia
- Department of Ophthalmology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 200233, P.R. China
| | - Xinhua Du
- Department of Ophthalmology, Shanghai Jiaotong University Affiliated Sixth People's Hospital, Shanghai 200233, P.R. China
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Pathophysiological Role of Peroxynitrite Induced DNA Damage in Human Diseases: A Special Focus on Poly(ADP-ribose) Polymerase (PARP). Indian J Clin Biochem 2015; 30:368-85. [PMID: 26788021 DOI: 10.1007/s12291-014-0475-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 12/22/2014] [Indexed: 12/17/2022]
Abstract
Peroxynitrite is formed in biological systems when nitric oxide and superoxide rapidly interact at near equimolar ratio. Peroxynitrite, though not a free radical by chemical nature, is a powerful oxidant which reacts with proteins, DNA and lipids. These reactions trigger a wide array of cellular responses ranging from subtle modulations of cell signaling to overwhelming oxidative injury, committing cells to necrosis or apoptosis. The present review outlines the various peroxynitrite-induced DNA modifications with special mention to the formation of 8-nitroguanine and 8-oxoguanine as well as the induction of DNA single strand breakage. Low concentrations of peroxynitrite cause apoptotic death, whereas higher concentrations cause necrosis with cellular energetics (ATP and NAD(+)) serving as control between the two modes of cell death. DNA damage induced by peroxynitrite triggers the activation of DNA repair systems. A DNA nick sensing enzyme, poly(ADP-ribose) polymerase-1 (PARP-1) becomes activated upon detecting DNA breakage and it cleaves NAD(+) into nicotinamide and ADP-ribose and polymerizes the latter on nuclear acceptor proteins. Over-activation of PARP induced by peroxynitrite consumes NAD(+) and consequently ATP decreases, culminating in cell dysfunction, apoptosis or necrosis. This mechanism has been implicated in the pathogenesis of various diseases like diabetes, cardiovascular diseases and neurodegenerative diseases. In this review, we have discussed the cytotoxic effects (apoptosis and necrosis) of peroxynitrite in the etiology of the mentioned diseases, focusing on the role of PARP in DNA repair in presence of peroxynitrite.
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18
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Karabay AZ, Aktan F, Sunguroğlu A, Buyukbingol Z. Methylsulfonylmethane modulates apoptosis of LPS/IFN-γ-activated RAW 264.7 macrophage-like cells by targeting p53, Bax, Bcl-2, cytochrome c and PARP proteins. Immunopharmacol Immunotoxicol 2014; 36:379-89. [DOI: 10.3109/08923973.2014.956752] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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19
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Rochette L, Zeller M, Cottin Y, Vergely C. Diabetes, oxidative stress and therapeutic strategies. Biochim Biophys Acta Gen Subj 2014; 1840:2709-29. [PMID: 24905298 DOI: 10.1016/j.bbagen.2014.05.017] [Citation(s) in RCA: 315] [Impact Index Per Article: 31.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 05/12/2014] [Accepted: 05/27/2014] [Indexed: 02/07/2023]
Abstract
BACKGROUND Diabetes has emerged as a major threat to health worldwide. SCOPE OF REVIEW The exact mechanisms underlying the disease are unknown; however, there is growing evidence that excess generation of reactive oxygen species (ROS), largely due to hyperglycemia, causes oxidative stress in a variety of tissues. Oxidative stress results from either an increase in free radical production, or a decrease in endogenous antioxidant defenses, or both. ROS and reactive nitrogen species (RNS) are products of cellular metabolism and are well recognized for their dual role as both deleterious and beneficial species. In type 2 diabetic patients, oxidative stress is closely associated with chronic inflammation. Multiple signaling pathways contribute to the adverse effects of glucotoxicity on cellular functions. There are many endogenous factors (antioxidants, vitamins, antioxidant enzymes, metal ion chelators) that can serve as endogenous modulators of the production and action of ROS. Clinical trials that investigated the effect of antioxidant vitamins on the progression of diabetic complications gave negative or inconclusive results. This lack of efficacy might also result from the fact that they were administered at a time when irreversible alterations in the redox status are already under way. Another strategy to modulate oxidative stress is to exploit the pleiotropic properties of drugs directed primarily at other targets and thus acting as indirect antioxidants. MAJOR CONCLUSIONS It appears important to develop new compounds that target key vascular ROS producing enzymes and mimic endogenous antioxidants. GENERAL SIGNIFICANCE This strategy might prove clinically relevant in preventing the development and/or retarding the progression of diabetes associated with vascular diseases.
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Affiliation(s)
- Luc Rochette
- Laboratoire de Physiopathologie et Pharmacologie Cardio-Métaboliques, INSERM UMR866, Université de Bourgogne, Facultés de Médecine et Pharmacie, 7 Boulevard Jeanne d'Arc, 21079 Dijon, France.
| | - Marianne Zeller
- Laboratoire de Physiopathologie et Pharmacologie Cardio-Métaboliques, INSERM UMR866, Université de Bourgogne, Facultés de Médecine et Pharmacie, 7 Boulevard Jeanne d'Arc, 21079 Dijon, France
| | - Yves Cottin
- Laboratoire de Physiopathologie et Pharmacologie Cardio-Métaboliques, INSERM UMR866, Université de Bourgogne, Facultés de Médecine et Pharmacie, 7 Boulevard Jeanne d'Arc, 21079 Dijon, France
| | - Catherine Vergely
- Laboratoire de Physiopathologie et Pharmacologie Cardio-Métaboliques, INSERM UMR866, Université de Bourgogne, Facultés de Médecine et Pharmacie, 7 Boulevard Jeanne d'Arc, 21079 Dijon, France
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Peiris H, Bonder CS, Coates PTH, Keating DJ, Jessup CF. The β-cell/EC axis: how do islet cells talk to each other? Diabetes 2014; 63:3-11. [PMID: 24357688 DOI: 10.2337/db13-0617] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Within the pancreatic islet, the β-cell represents the ultimate biosensor. Its central function is to accurately sense glucose levels in the blood and consequently release appropriate amounts of insulin. As the only cell type capable of insulin production, the β-cell must balance this crucial workload with self-preservation and, when required, regeneration. Evidence suggests that the β-cell has an important ally in intraislet endothelial cells (ECs). As well as providing a conduit for delivery of the primary input stimulus (glucose) and dissemination of its most important effector (insulin), intraislet blood vessels deliver oxygen to these dense clusters of metabolically active cells. Furthermore, it appears that ECs directly impact insulin gene expression and secretion and β-cell survival. This review discusses the molecules and pathways involved in the crosstalk between β-cells and intraislet ECs. The evidence supporting the intraislet EC as an important partner for β-cell function is examined to highlight the relevance of this axis in the context of type 1 and type 2 diabetes. Recent work that has established the potential of ECs or their progenitors to enhance the re-establishment of glycemic control following pancreatic islet transplantation in animal models is discussed.
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Affiliation(s)
- Heshan Peiris
- Department of Human Physiology, Centre for Neuroscience, Flinders University of South Australia, Adelaide, Australia
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21
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Genovese S, Epifano F, Fiorito S, Curini M, Marrelli M, Menichini F, Conforti F. Conjugation of l-NAME to prenyloxycinnamic acids improves its inhibitory effects on nitric oxide production. Bioorg Med Chem Lett 2013; 23:2933-5. [DOI: 10.1016/j.bmcl.2013.03.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 03/11/2013] [Accepted: 03/13/2013] [Indexed: 12/31/2022]
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Protective effect of nicotinamide on high glucose/palmitate-induced glucolipotoxicity to INS-1 beta cells is attributed to its inhibitory activity to sirtuins. Arch Biochem Biophys 2013; 535:187-96. [PMID: 23562377 DOI: 10.1016/j.abb.2013.03.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Revised: 03/14/2013] [Accepted: 03/17/2013] [Indexed: 11/20/2022]
Abstract
This study was initiated to determine whether the protective effect of nicotinamide (NAM) on high glucose/palmitate (HG/PA)-induced INS-1 beta cell death was due to its role as an anti-oxidant, nicotinamide dinucleotide (NAD+) precursor, or inhibitor of NAD+-consuming enzymes such as poly (ADP-ribose) polymerase (PARP) or sirtuins. All anti-oxidants tested were not protective against HG/PA-induced INS-1 cell death. Direct supplementation of NAD+ or indirect supplementation through NAD+ salvage or de novo pathway did not protect the death. Knockdown of the NAD+ salvage pathway enzymes such as nicotinamide phosphoribosyl transferase (NAMPT) or nicotinamide mononucleotide adenyltransferase (NMNAT) did not augment death. On the other hand, pharmacological inhibition or knockdown of PARP did not affect death. However, sirtinol as an inhibitor of NAD-dependant deacetylase or knockdown of SIRT3 or SIRT4 significantly reduced the HG/PA-induced death. These data suggest that protective effect of NAM on beta cell glucolipotoxicity is attributed to its inhibitory activity on sirtuins.
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23
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The Sound of Silence: RNAi in Poly (ADP-Ribose) Research. Genes (Basel) 2012; 3:779-805. [PMID: 24705085 PMCID: PMC3899979 DOI: 10.3390/genes3040779] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 11/05/2012] [Accepted: 11/06/2012] [Indexed: 02/07/2023] Open
Abstract
Poly(ADP-ribosyl)-ation is a nonprotein posttranslational modification of proteins and plays an integral part in cell physiology and pathology. The metabolism of poly(ADP-ribose) (PAR) is regulated by its synthesis by poly(ADP-ribose) polymerases (PARPs) and on the catabolic side by poly(ADP-ribose) glycohydrolase (PARG). PARPs convert NAD+ molecules into PAR chains that interact covalently or noncovalently with target proteins and thereby modify their structure and functions. PAR synthesis is activated when PARP1 and PARP2 bind to DNA breaks and these two enzymes account for almost all PAR formation after genotoxic stress. PARG cleaves PAR molecules into free PAR and finally ADP-ribose (ADPR) moieties, both acting as messengers in cellular stress signaling. In this review, we discuss the potential of RNAi to manipulate the levels of PARPs and PARG, and consequently those of PAR and ADPR, and compare the results with those obtained after genetic or chemical disruption.
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24
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Ylipaasto P, Smura T, Gopalacharyulu P, Paananen A, Seppänen-Laakso T, Kaijalainen S, Ahlfors H, Korsgren O, Lakey JRT, Lahesmaa R, Piemonti L, Oresic M, Galama J, Roivainen M. Enterovirus-induced gene expression profile is critical for human pancreatic islet destruction. Diabetologia 2012; 55:3273-83. [PMID: 22983635 DOI: 10.1007/s00125-012-2713-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Accepted: 07/27/2012] [Indexed: 01/29/2023]
Abstract
AIMS/HYPOTHESIS Virally induced inflammatory responses, beta cell destruction and release of beta cell autoantigens may lead to autoimmune reactions culminating in type 1 diabetes. Therefore, viral capability to induce beta cell death and the nature of virus-induced immune responses are among key determinants of diabetogenic viruses. We hypothesised that enterovirus infection induces a specific gene expression pattern that results in islet destruction and that such a host response pattern is not shared among all enterovirus infections but varies between virus strains. METHODS The changes in global gene expression and secreted cytokine profiles induced by lytic or benign enterovirus infections were studied in primary human pancreatic islet using DNA microarrays and viral strains either isolated at the clinical onset of type 1 diabetes or capable of causing a diabetes-like condition in mice. RESULTS The expression of pro-inflammatory cytokine genes (IL-1-α, IL-1-β and TNF-α) that also mediate cytokine-induced beta cell dysfunction correlated with the lytic potential of a virus. Temporally increasing gene expression levels of double-stranded RNA recognition receptors, antiviral molecules, cytokines and chemokines were detected for all studied virus strains. Lytic coxsackievirus B5 (CBV-5)-DS infection also downregulated genes involved in glycolysis and insulin secretion. CONCLUSIONS/INTERPRETATION The results suggest a distinct, virus-strain-specific, gene expression pattern leading to pancreatic islet destruction and pro-inflammatory effects after enterovirus infection. However, neither viral replication nor cytotoxic cytokine production alone are sufficient to induce necrotic cell death. More likely the combined effect of these and possibly cellular energy depletion lie behind the enterovirus-induced necrosis of islets.
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Affiliation(s)
- P Ylipaasto
- Intestinal Viruses Unit, National Institute for Health and Welfare (THL), Helsinki, Finland
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25
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Andreone T, Meares GP, Hughes KJ, Hansen PA, Corbett JA. Cytokine-mediated β-cell damage in PARP-1-deficient islets. Am J Physiol Endocrinol Metab 2012; 303:E172-9. [PMID: 22535743 PMCID: PMC3431132 DOI: 10.1152/ajpendo.00055.2012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Poly(ADP)-ribose polymerase (PARP) is an abundant nuclear protein that is activated by DNA damage; once active, it modifies nuclear proteins through attachment of poly(ADP)-ribose units derived from β-nicotinamide adenine dinucleotide (NAD(+)). In mice, the deletion of PARP-1 attenuates tissue injury in a number of animal models of human disease, including streptozotocin-induced diabetes. Also, inflammatory cell signaling and inflammatory gene expression are attenuated in macrophages isolated from endotoxin-treated PARP-1-deficient mice. In this study, the effects of PARP-1 deletion on cytokine-mediated β-cell damage and macrophage activation were evaluated. There are no defects in inflammatory mediator signaling or inflammatory gene expression in macrophages and islets isolated from PARP-1-deficient mice. While PARP-1 deficiency protects islets against cytokine-induced islet cell death as measured by biochemical assays of membrane polarization, the genetic absence of PARP-1 does not effect cytokine-induced inhibition of insulin secretion or cytokine-induced DNA damage in islets. While PARP-1 deficiency appears to provide protection from cell death, it fails to provide protection against the inhibitory actions of cytokines on insulin secretion or the damaging actions on islet DNA integrity.
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Affiliation(s)
- Teresa Andreone
- Department of Pediatrics, Saint Louis University, St. Louis, MO, USA.
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26
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Cobo-Vuilleumier N, Gauthier BR. PARP-1 and cytokine-mediated β-cell damage: a nick in the Okamoto model? Am J Physiol Endocrinol Metab 2012; 303:E170-1. [PMID: 22569074 DOI: 10.1152/ajpendo.00226.2012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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27
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Welsby I, Hutin D, Leo O. Complex roles of members of the ADP-ribosyl transferase super family in immune defences: looking beyond PARP1. Biochem Pharmacol 2012; 84:11-20. [PMID: 22402301 DOI: 10.1016/j.bcp.2012.02.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 02/16/2012] [Accepted: 02/20/2012] [Indexed: 12/25/2022]
Abstract
ADP ribosylation has been recently recognised as an important posttranslational modification regulating numerous cellular processes. This enzymatic activity is shared by two major families of enzymes, the extracellular ADP-ribosyl-transferases, or ecto-ARTS and the poly-ADP-ribosyltranferases, whose denomination derives from the capacity of its founding member, PARP1, to synthesise large linear or branched polymers of ADP-ribose on target proteins. This latter post-translational modification has recently attracted much interest based on its role in the cellular response to genotoxic and oxidative stress. Accordingly, a series of PARP-specific pharmacological inhibitors have demonstrated cell survival and anti-inflammatory properties in vivo, promoting a renewed interest in the potential immunoregulatory role of this gene family. More recently, the role of ADP-ribosylation in regulating several aspects of intracellular signalling and gene transcription has been uncovered, in particular within cells of the immune system, revealing the potential immunomodulatory role of several members of this family in addition to PARP1. We review herein the experimental evidence illustrating the complex role played by this gene family in regulating multiple aspects of the immune response, including cell survival, cytokine gene transcription and antiviral innate defences. In particular, the unexpected potential anti-inflammatory role of members of this family (including in particular PARP5a, 5b and PARP14) will be briefly discussed, raising some concern on the use of pan-specific PARP inhibitors to treat chronic inflammatory diseases.
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Affiliation(s)
- Iain Welsby
- Laboratoire d'Immunobiologie, Université Libre de Bruxelles, Gosselies, Belgium
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28
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Phenolic compounds isolated from Pilea microphylla prevent radiation-induced cellular DNA damage. Acta Pharm Sin B 2011. [DOI: 10.1016/j.apsb.2011.10.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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29
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Bernstein AI, Garrison SP, Zambetti GP, O'Malley KL. 6-OHDA generated ROS induces DNA damage and p53- and PUMA-dependent cell death. Mol Neurodegener 2011; 6:2. [PMID: 21211034 PMCID: PMC3025875 DOI: 10.1186/1750-1326-6-2] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Accepted: 01/06/2011] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Parkinson's disease (PD) is characterized by the selective loss of dopaminergic neurons in the substantia nigra (SN), resulting in tremor, rigidity, and bradykinesia. Although the etiology is unknown, insight into the disease process comes from the dopamine (DA) derivative, 6-hydroxydopamine (6-OHDA), which produces PD-like symptoms. Studies show that 6-OHDA activates stress pathways, such as the unfolded protein response (UPR), triggers mitochondrial release of cytochrome-c, and activates caspases, such as caspase-3. Because the BH3-only protein, Puma (p53-upregulated mediator of apoptosis), is activated in response to UPR, it is thought to be a link between cell stress and apoptosis. RESULTS To test the hypothesis that Puma serves such a role in 6-OHDA-mediated cell death, we compared the response of dopaminergic neurons from wild-type and Puma-null mice to 6-OHDA. Results indicate that Puma is required for 6-OHDA-induced cell death, in primary dissociated midbrain cultures as well as in vivo. In these cultures, 6-OHDA-induced DNA damage and p53 were required for 6-OHDA-induced cell death. In contrast, while 6-OHDA led to upregulation of UPR markers, loss of ATF3 did not protect against 6-OHDA. CONCLUSIONS Together, our results indicate that 6-OHDA-induced upregulation of Puma and cell death are independent of UPR. Instead, p53 and DNA damage repair pathways mediate 6-OHDA-induced toxicity.
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Affiliation(s)
- Alison I Bernstein
- Department of Anatomy and Neurobiology, Washington University School of Medicine, St, Louis, MO 63110, USA.
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Zhang R, Kim JS, Kang KA, Piao MJ, Kim KC, Hyun JW. Protective Mechanism of KIOM-4 in Streptozotocin-Induced Pancreatic β-Cells Damage Is Involved in the Inhibition of Endoplasmic Reticulum Stress. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2010; 2011:231938. [PMID: 20924496 PMCID: PMC2949593 DOI: 10.1155/2011/231938] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2010] [Accepted: 08/27/2010] [Indexed: 02/07/2023]
Abstract
Endoplasmic reticulum stress-mediated apoptosis plays an important role in the destruction of pancreatic β-cells and contributes to the development of type 1 diabetes. The present study examined the effect of KIOM-4, a mixture of four plant extracts, on streptozotocin- (STZ-) induced endoplasmic reticulum (ER) stress in rat pancreatic β-cells (RINm5F). KIOM-4 was found to inhibit STZ-induced apoptotic cell death, confirmed by formation of apoptotic bodies and DNA fragmentation. STZ was found to induce the characteristics of ER stress; mitochondrial Ca(2+) overloading, enhanced ER staining, release of glucose-regulated protein 78 (GRP78), phosphorylation of RNA-dependent protein kinase (PKR) like ER kinase (PERK) and eukaryotic initiation factor-2α (eIF-2α), cleavage of activating transcription factor 6 (ATF6) and caspase 12, and upregulation of CCAAT/enhancer-binding protein-homologous protein (CHOP). However, KIOM-4 attenuated these changes induced by STZ. Furthermore, KIOM-4 suppressed apoptosis induced by STZ in CHOP downregulated cells using CHOP siRNA. These results suggest that KIOM-4 exhibits protective effects in STZ-induced pancreatic β-cell damage, by interrupting the ER stress-mediated pathway.
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Affiliation(s)
- Rui Zhang
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Jin Sook Kim
- Diabetic Complication Research Center, Division of Traditional Korean Medicine Integrated Research, Korea Institute of Oriental Medicine, Daejeon 305-811, Republic of Korea
| | - Kyoung Ah Kang
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Mei Jing Piao
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Ki Cheon Kim
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
| | - Jin Won Hyun
- School of Medicine, Jeju National University, Jeju-si 690-756, Republic of Korea
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Poly(ADP-ribose) polymerase-1 (PARP-1) and its therapeutic implications. Vascul Pharmacol 2010; 53:77-87. [DOI: 10.1016/j.vph.2010.06.003] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Revised: 05/03/2010] [Accepted: 06/16/2010] [Indexed: 01/24/2023]
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Kang X, Kim HJ, Ramirez M, Salameh S, Ma X. The septic shock-associated IL-10 -1082 A > G polymorphism mediates allele-specific transcription via poly(ADP-Ribose) polymerase 1 in macrophages engulfing apoptotic cells. THE JOURNAL OF IMMUNOLOGY 2010; 184:3718-24. [PMID: 20181890 DOI: 10.4049/jimmunol.0903613] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The biallelic IL-10 single nucleotide polymorphism at -1082 of the promoter region linked to individual variation in cytokine inducibility has been strongly implicated in several pathological conditions including the development of, and outcomes in, septic shock during pneumococcal infection, acute respiratory distress syndrome, and cardiac dysfunction. However, the molecular basis of the single nucleotide polymorphism-mediated variable IL-10 production levels has not been explored. In this study, we report that the -1082G > A alleles in the promoter region of the human IL-10 gene physically interact with a nuclear protein in an allele-specific manner that results in different levels of IL-10 transcription. This protein has been identified as poly(ADP-ribose) polymerase 1 (PARP-1). We show that PARP-1 acts as a transcription repressor, and its DNA-binding activity is strongly regulated in macrophages that engulf apoptotic cells but not stimulated with LPS. These findings unveil a novel role of PARP-1 in the regulation of IL-10 production in an allele-dependent way, which determines individual susceptibility to sepsis-induced inflammatory pathology and the immunological sequelae in a physiological process in which clearance of infection-induced apoptotic cells by professional phagocytes triggers the cytokine synthesis.
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Affiliation(s)
- Xiaoyan Kang
- Department of Microbiology and Immunology, Weill Cornell Medical College, Cornell University, New York, NY 10065, USA
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Majumdar S, Mukherjee S, Maiti A, Karmakar S, Das AS, Mukherjee M, Nanda A, Mitra C. Folic acid or combination of folic acid and vitamin B(12) prevents short-term arsenic trioxide-induced systemic and mitochondrial dysfunction and DNA damage. ENVIRONMENTAL TOXICOLOGY 2009; 24:377-387. [PMID: 18825727 DOI: 10.1002/tox.20442] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The effect of folic acid and folic acid + vitamin B(12) supplementation upon short-term arsenic-induced systemic and pancreatic islet cell mitochondria oxidative stress was investigated in male rats. Arsenic trioxide was administered orally at a dose of 3 mg kg body weight(-1) day(-1) for 30 days, and folic acid and vitamin B(12) were administered at a dose of 36 and 0.63 microg kg body weight(-1) day(-1), respectively, for 30 days. Compared to control, arsenic-treated group showed a significant increase in the levels of systemic oxidative markers, malondialdehyde (MDA), nitric oxide (NO), and hydroxyl radical (OH(-)) formation, which were found decreased significantly after supplementation either with folic acid or a combination of folic acid + vitamin B(12). Similar supplementations were found effective against arsenic-induced oxidative marker changes (MDA, NO, and OH(-)) in pancreatic islet cell mitochondria. Also, low activities of antioxidant defense enzymes such as superoxide dismutase and catalase, and level of antioxidant glutathione, all could regain significantly on supplementations both against systemic and islet cell mitochondria oxidative stress. Results of agarose-gel electrophoresis of DNA from lymphocytes and islet cells of arsenic-exposed rats showed DNA smearing, which could be reduced with simultaneous administration either with folic acid or a combination of folic acid + vitamin B(12). Significantly, similar supplementations were found effective in increasing the urinary clearance of arsenic. Together, these results indicate that folic acid and vitamin B(12) may be effective to reduce the arsenic-induced damage at molecular target level.
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Peralta-Leal A, Rodríguez-Vargas JM, Aguilar-Quesada R, Rodríguez MI, Linares JL, de Almodóvar MR, Oliver FJ. PARP inhibitors: new partners in the therapy of cancer and inflammatory diseases. Free Radic Biol Med 2009; 47:13-26. [PMID: 19362586 DOI: 10.1016/j.freeradbiomed.2009.04.008] [Citation(s) in RCA: 141] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Revised: 04/07/2009] [Accepted: 04/08/2009] [Indexed: 12/21/2022]
Abstract
Poly(ADP-ribose) polymerases (PARPs) are defined as cell signaling enzymes that catalyze the transfer of ADP-ribose units from NAD(+) to a number of acceptor proteins. PARP-1, the best characterized member of the PARP family, which currently comprises 18 members, is an abundant nuclear enzyme implicated in cellular responses to DNA injury provoked by genotoxic stress. PARP is involved in DNA repair and transcriptional regulation and is now recognized as a key regulator of cell survival and cell death as well as a master component of a number of transcription factors involved in tumor development and inflammation. PARP-1 is essential to the repair of DNA single-strand breaks via the base excision repair pathway. Inhibitors of PARP-1 have been shown to enhance the cytotoxic effects of ionizing radiation and DNA-damaging chemotherapy agents, such as the methylating agents and topoisomerase I inhibitors. There are currently at least five PARP inhibitors in clinical trial development. Recent in vitro and in vivo evidence suggests that PARP inhibitors could be used not only as chemo/radiotherapy sensitizers, but also as single agents to selectively kill cancers defective in DNA repair, specifically cancers with mutations in the breast cancer-associated genes (BRCA1 and BRCA2). PARP becomes activated in response to oxidative DNA damage and depletes cellular energy pools, thus leading to cellular dysfunction in various tissues. The activation of PARP may also induce various cell death processes and promotes an inflammatory response associated with multiple organ failure. Inhibition of PARP activity is protective in a wide range of inflammatory and ischemia-reperfusion-associated diseases, including cardiovascular diseases, diabetes, rheumatoid arthritis, endotoxic shock, and stroke. The aim of this review is to overview the emerging data in the literature showing the role of PARP in the pathogenesis of cancer and inflammatory diseases and unravel the solid body of literature that supports the view that PARP is an important target for therapeutic intervention in critical illness.
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Affiliation(s)
- Andreína Peralta-Leal
- Instituto de Parasitología y Biomedicina López Neyra, Consejo Superior de Investigaciones Cientificas (CSIC), Granada, Spain
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Wang M, Wang P, Peng JL, Wu S, Zhao XP, Li L, Shen GX. The altered expression of glucose-regulated proteins 78 in different phase of streptozotocin-affected pancreatic beta-cells. Cell Stress Chaperones 2009; 14:43-8. [PMID: 18597185 PMCID: PMC2673903 DOI: 10.1007/s12192-008-0053-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2008] [Revised: 04/06/2008] [Accepted: 05/12/2008] [Indexed: 11/24/2022] Open
Abstract
Endoplasmic reticulum (ER) stress-mediated apoptosis plays an important role in the destruction of pancreatic beta-cells and contributes to the development of type 1 diabetes. The chaperone molecule, glucose-regulated proteins 78 (Grp78), is required to maintain ER function during toxic insults. In this study, we investigated the changes of Grp78 expression in different phases of streptozotocin (STZ)-affected beta-cells to explore the relationship between Grp78 and the response of beta-cells to ER stress. An insulinoma cell line (NIT-1) treated with STZ for different time periods and STZ-induced diabetic Balb/C mice at different time points were used as the model system. The level of Grp78 and C/EBP homologous protein (CHOP) mRNA were detected by real-time polymerase chain reaction and their protein by immunoblot. Apoptosis and necrosis was measured by flow cytometry. In addition, the changes of Grp78 protein in STZ-treated nondiabetic mice were also detected by immunoblot. Grp78 expression significantly increased in the early phase but decreased in the later phase of affected beta-cells, while CHOP was induced and apoptosis occurred along with the decrease of Grp78. Interestingly, the Grp78 protein of STZ-treated nondiabetic mice increased stably compared with that of the control. From the results, we can conclude that Grp78 may contribute to the response of beta-cells to ER stress, and more attention should be paid to Grp78 in the improvement of diabetes.
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Affiliation(s)
- Min Wang
- Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 China
- Department of Basic Medical Science, Hubei College of Traditional Chinese Medicine, Wuhan, 430065 China
| | - Ping Wang
- Department of Adult Internal Medicine, Hubei Maternal and Child Health Hospital, Wuhan, 430070 China
| | - Ji-Lin Peng
- Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Sha Wu
- Department of Immunology, Southern Medical University, Guangzhou, 510182 China
| | - Xiao-Ping Zhao
- Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Li Li
- Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 China
| | - Guan-Xin Shen
- Department of Immunology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030 China
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36
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Hässler S, Peltonen L, Sandler S, Winqvist O. Aire deficiency causes increased susceptibility to streptozotocin-induced murine type 1 diabetes. Scand J Immunol 2008; 67:569-80. [PMID: 18399912 DOI: 10.1111/j.1365-3083.2008.02106.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aire-deficient mice are a model of the human monogenic disorder autoimmune polyendocrine syndrome type I (APS I) characterized by a progressive autoimmune destruction of multiple endocrine glands such as the adrenal cortex, the parathyroids and the beta-cells of the pancreas. The disease is caused by mutations in the autoimmune regulator (AIRE) gene, a putative transcription factor expressed in thymic medullary epithelial cells and in antigen-presenting cells of the myeloid lineage in peripheral lymphoid organs. As Aire(-/-) mice do not spontaneously develop endocrinopathies, we wanted to evaluate the autoimmune multiple low-dose streptozotocin (MLDSTZ) diabetes model in Aire(-/-) mice. Surprisingly, Aire heterozygote mice were most susceptible to MLDSTZ-induced diabetes, whereas Aire(-/-) mice displayed an intermediate sensitivity to diabetes. Furthermore, Aire(-/-) macrophages produced higher levels of TNF-alpha and lower levels of IL-10 following streptozotocin stimulation, and Aire(-/-) mice developed a higher frequency of islet cells autoantibodies as a sign of increased activation. However, the number of islet infiltrating F4/80(+) Aire(-/-) macrophages was significantly decreased which was attributed to an increased susceptibility to streptozotocin cytotoxicity of Aire(-/-) macrophages. In conclusion, Aire(-/-) macrophages display an increased activation after STZ stimuli, but suffer from increased susceptibility to STZ cytotoxicity. These results support an important function of Aire in the control of peripheral tolerance through myeloid antigen-presenting cells.
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Affiliation(s)
- S Hässler
- Department of Medical Sciences, Uppsala University Hospital, Uppsala, Sweden
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37
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Beneke S. Poly(ADP-ribose) polymerase activity in different pathologies--the link to inflammation and infarction. Exp Gerontol 2008; 43:605-614. [PMID: 18511226 DOI: 10.1016/j.exger.2008.04.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 03/25/2008] [Accepted: 04/14/2008] [Indexed: 12/27/2022]
Abstract
DNA repair and aging are two phenomena closely connected to each other. The poly(ADP-ribosyl)ation reaction has been implicated in both of them. Poly(ADP-ribose) was originally discovered as an enzymatic reaction product after DNA damage. Soon it became evident that it is necessary for regulation of different repair pathways. Also, evidence accumulated that poly(ADP-ribose) formation capacity is at least correlated with the life span of mammalian species. As a NAD(+)-consuming process, poly(ADP-ribosyl)ation can lead to cell death by energy depletion. This finding opened the area for investigation of poly(ADP-ribose) polymerase activity and polymer formation in pathologies. This review provides an introduction into the wide and complex field of poly(ADP-ribosyl)ation in different pathologies with regards of cell death regulation, inflammation and resulting tissue damage.
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Affiliation(s)
- Sascha Beneke
- University of Konstanz, Molecular Toxicology Group, Universiteatsstr. 10, Box X911, 78457 Konstanz, Germany
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38
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Wang M, Wang P, Liu YQ, Peng JL, Zhao XP, Wu S, He FR, Wen X, Li Y, Shen GX. The immunosuppressive and protective ability of glucose-regulated protein 78 for improvement of alloimmunity in beta cell transplantation. Clin Exp Immunol 2007; 150:546-52. [PMID: 17956578 DOI: 10.1111/j.1365-2249.2007.03525.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
An insulinoma cell line, NIT-1, transfected with glucose-regulated protein 78 (GRP78) was established, namely NIT-GRP78, and used to study the immunosuppressive and protective ability of GRP78. In extended cytotoxic T lymphocyte (CTL) killing assay, NIT-1-primed lymphocytes were more cytotoxic in killing beta cells than NIT-GRP78-primed lymphocytes. Severe necrosis was observed only when the NIT-1-primed lymphocytes were cultured with NIT-1 beta cells, but not with NIT-GRP78 cells. In addition, an increase of interleukin (IL)-4 secretion from beta cell-primed splenocytes when GRP78 presence was observed in cytokine enzyme-linked immunosorbent assay (ELISA). Diabetic mice reached normoglycaemia promptly and gained weight after transplantation of either NIT-1 or NIT-GRP78 cells. However, the recipient mice transplanted with NIT-GRP78 cells lived much longer than those recipients transplanted with NIT-1 cells, which was due apparently to prolonged insulin production by the transplanted NIT-GRP78 cells. In fact, we observed a significant increase of insulin concentration after glucose stimulation of diabetic mice received NIT-GRP78 cells at day 7 post-transplantation. From the results we propose that GRP78 could have a dual function in both protecting NIT-1 cells from CTL-mediated lysis and stimulating a population of T helper 2 cells to down-regulate the immune response to the transplanted beta cells.
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Affiliation(s)
- M Wang
- Department of Immunology, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
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39
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Szabó C. Poly (ADP-ribose) polymerase activation and circulatory shock. NOVARTIS FOUNDATION SYMPOSIUM 2007; 280:92-103; discussion 103-7, 160-4. [PMID: 17380790 DOI: 10.1007/0-387-36005-0_16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Sepsis is associated with increased production of reactive oxidant species. Oxidative and nitrosative stress can lead to activation of the nuclear enzyme poly (ADP-ribose) polymerase (PARP), with subsequent loss of cellular functions. Activation of PARP may dramatically lower the intracellular concentration of its substrate, NAD thus slowing the rate of glycolysis, electron transport and subsequently ATP formation. This process can result in cell dysfunction and cell death. In addition, PARP enhances the expression of various pro-inflammatory mediators, via activation of NF-kappaB, MAP kinase and AP-1 and other signal transduction pathways. Preclinical studies in various rodent and large animal models demonstrate that PARP inhibition or PAR deficiency exerts beneficial effects on the haemodynamic and metabolic alterations associated with septic and haemorrhagic shock. Recent human data also support the role of PARP in septic shock: In a retrospective study in 25 septic patients, an increase in plasma troponin level was related to increased mortality risk. In patients who died, significant myocardial damage was detected, and histological analysis of heart showed inflammatory infiltration, increased collagen deposition, and derangement of mitochondrial criptae. Immunohistochemical staining for poly(ADP-ribose) (PAR), the product of activated PARP was demonstrated in septic hearts. There was a positive correlation between PAR staining and troponin I; and a correlation of PAR staining and LVSSW. Thus, there is significant PARP activation in animal models subjected to circulatory shock, as well as in the hearts of septic patients. Based on the interventional studies in animals and the correlations observed in patients we propose that PARP activation may be, in part responsible for the cardiac depression and haemodynamic failure seen in humans with severe sepsis. Interestingly, recent studies reveal that the protective effects of PARP inhibitors are predominant in male animals, and are not apparent in female animals. Oestrogen, by providing a baseline inhibitory effect on PARP activation, may be partially responsible for this gender difference.
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Affiliation(s)
- Csaba Szabó
- Department of Surgery, UMD NJ-New Jersey Medical School, Newark, NJ 07103, USA
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Chambers KT, Weber SM, Corbett JA. PGJ2-stimulated beta-cell apoptosis is associated with prolonged UPR activation. Am J Physiol Endocrinol Metab 2007; 292:E1052-61. [PMID: 17148750 DOI: 10.1152/ajpendo.00274.2006] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Peroxisome proliferator-activated receptor-gamma (PPARgamma) ligands have been shown to possess anti-inflammatory properties that include the inhibition of transcription factor activation and the expression of inflammatory genes. Using pancreatic beta-cells, we have shown that PPARgamma ligands such as 15-deoxy-Delta(12,14)-prostaglandin J(2) (PGJ(2)) attenuate interferon-gamma-induced signal transducer and activator of transcription 1 activation and interleukin (IL)-1beta-induced nuclear factor-kappaB activation by a pathway that correlates with endoplasmic reticulum stress and the induction of the unfolded protein response (UPR). The UPR is a conserved cellular response activated by a number of cell stressors and is believed to alleviate the stress and promote cell survival. However, prolonged activation of the UPR results in cellular death by apoptosis. In this report, we have examined the effects of PGJ(2) on UPR activation and the consequences of this activation on cell survival. Consistent with induction of a cell death pathway, treatment of rat islets and RINm5F cells for 24 h with PGJ(2) results in caspase-3 activation and caspase-dependent beta-cell death. The actions of these ligands do not appear to be selective for beta-cells, because PGJ(2) stimulates macrophage apoptosis in a similar fashion. Associated with cell death is the enhanced phosphorylation of eukaryotic initiation factor 2alpha (eIF2alpha), and in cells expressing a mutant of eIF2alpha that cannot be phosphorylated, the stimulatory actions of PGJ(2) on caspase-3 activation are augmented. These findings suggest that, whereas PGJ(2)-induced UPR activation is associated with an inhibition of cytokine signaling, prolonged UPR activation results in cell death, and that eIF2alpha phosphorylation may function in a protective manner to attenuate cell death.
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Affiliation(s)
- Kari T Chambers
- Saint Louis University School of Medicine, Edward A. Doisy Department of Biochemistry and Molecular Biology, 1402 South Grand Blvd., St. Louis, MO 63104, USA
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41
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Wang M, Zhao XR, Wang P, Li L, Dai Y, Huang H, Lei P, Zhu HF, Shen GX. Glucose regulated proteins 78 protects insulinoma cells (NIT-1) from death induced by streptozotocin, cytokines or cytotoxic T lymphocytes. Int J Biochem Cell Biol 2007; 39:2076-82. [PMID: 17689130 DOI: 10.1016/j.biocel.2007.05.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2007] [Revised: 05/11/2007] [Accepted: 05/30/2007] [Indexed: 10/23/2022]
Abstract
Endoplasmic reticulum stress-mediated apoptosis plays an important role in the destruction of pancreatic beta-cell, and contributes to the development of type 1 diabetes. The chaperone molecule, glucose regulated proteins 78 (GRP78), is required to maintain ER function during toxic insults. In this study, we investigated the effect of GRP78 on the beta-cell apoptosis. We first measured GRP78 protein expression in different phase of streptozotocin-affected beta-cell by immunoblotting analysis. An insulinoma cell line, NIT-1, transfected with GRP78 was established, named NIT-GRP78, and used to study apoptosis, which was induced by streptozotocin or inflammatory cytokines. Apoptosis of NIT-1 or NIT-GRP78 cells was detected by flow cytometry, the transcription of C/EBP homologous protein (CHOP) was monitored by real-time PCR, the concentration of nitric oxide and the activity of superoxide dismutase were measured by colorimetric method. We found that, in comparison to NIT-1 cells, NIT-GRP78 cells responded to the streptozotocin or cytokines treatments with decreased concentration of nitric oxide, but increased activity of superoxide dismutase. In addition, the level of CHOP was also decreased in the NIT-GRP78 cells, which may mediate the resistance of the GRP78 overexpressed NIT-1 cells from apoptosis. Finally, we found that NIT-GRP78 cells were also more resistant than NIT-1 cells to cytotoxic T lymphocyte (CTL) specific killing detected by flow cytometry through target cells expressing green fluorescent protein cultured with effector cells and finally stained with propidium iodide. The data suggest that modulating GRP78 expression could be useful in preventing pancreatic beta-cell from the immunological destruction in type 1 diabetes individuals.
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Affiliation(s)
- M Wang
- Department of Immunology, Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430030, China
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42
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Hong J, Nakano Y, Yokomakura A, Ishihara K, Kim S, Kang YS, Ohuchi K. Nitric Oxide Production by the Vacuolar-Type (H+)-ATPase Inhibitors Bafilomycin A1 and Concanamycin A and Its Possible Role in Apoptosis in RAW 264.7 Cells. J Pharmacol Exp Ther 2006; 319:672-81. [PMID: 16895977 DOI: 10.1124/jpet.106.109280] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
In the mouse leukemic monocyte cell line RAW 264.7, the vacuolar-type (H(+))-ATPase (V-ATPase) inhibitors bafilomycin A1 and concanamycin A induced nitric oxide (NO) production through the expression of inducible nitric-oxide synthase mRNA and its protein and decreased cell growth and survival as determined by 3-(4,5-dimethyl(thiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Bafilomycin A1 and concanamycin A activated nuclear factor (NF)-kappaB and activator protein-1 and decreased the level of IkappaB-alpha and increased that of phosphorylated c-Jun N-terminal kinase (JNK). NO production induced by these V-ATPase inhibitors was suppressed by the NF-kappaB inhibitor Bay 11-7082 [(E)3-[(4-methylphenyl)sulfonyl])-2-propenenitrile] and the JNK inhibitor SP600125 [anthra[1,9-cd]pyrazol-6(2H)-one] in parallel with the partial alleviation of the V-ATPase inhibitor-induced decrease in MTT response. The Na(+),K(+)-ATPase inhibitor dibucaine and the F-ATPase inhibitor oligomycin did not induce NO production at which concentrations the MTT response was decreased. The NO donor S-nitroso-N-acetyl-dl-penicillamine further lowered the V-ATPase inhibitor-induced decrease in the MTT response, and the NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, sodium salt (carboxy-PTIO) alleviated it partially. Mitochondrial depolarization, an index of apoptosis, was induced by bafilomycin A1 and concanamycin A. On treatment with the nitric-oxide synthase inhibitor N(G)-monomethyl-l-arginine acetate, the disruption of mitochondrial membrane potential induced by bafilomycin A1 and concanamycin A was alleviated partially in parallel with the decrease in NO production. Carboxy-PTIO also alleviated it partially. Our findings suggest that the V-ATPase inhibitors bafilomycin A1 and concanamycin A similarly induce NO production and the newly produced NO participates partially in the V-ATPase inhibitor-induced apoptosis in RAW 264.7 cells.
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Affiliation(s)
- Jangja Hong
- Laboratory of Pathophysiological Biochemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan
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43
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Yeh CH, Chen TP, Lee CH, Wu YC, Lin YM, Jing Lin P. Inhibition of poly(adp-ribose) polymerase reduces cardiomyocytic apoptosis after global cardiac arrest under cardiopulmonary bypass. Shock 2006; 25:168-75. [PMID: 16525356 DOI: 10.1097/01.shk.0000188709.04777.48] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Cardiomyocytic apoptosis occurs after cardiopulmonary bypass (CPB) despite the use of perfusion techniques and cardioplegic solutions. Reactive oxygen species (ROS) cause single-strand DNA breaks and activate nuclear poly(ADP-ribose) polymerase (PARP), which leads to cellular damage. Therefore, the inhibition of PARP might protect cardiomyocytes from oxidative injuries. In this study, experiments were designed to determine whether a PARP inhibitor could decrease the myocardial ischemia/reperfusion injury after cardioplegia-induced global cardiac arrest under CPB, attenuate the appearance of cardiomyocytic apoptosis, and decrease damage from ROS. New Zealand white rabbits (10 in each group) were subjected to total CPB. Rabbits were weaned from CPB and reperfused for 4 h before the hearts were harvested. 3-Aminobenzamide and/or 3-aminobenzoic acid was added to the cardioplegic solution. The ascending aorta was cross-clamped for 60 min while intermittent cold crystalloid cardioplegic solution was infused into the aortic root every 20 min. The reperfused hearts were harvested and studied for evidence of apoptosis using the TUNEL method and Western blot analyses. The oxidative insults were checked using ELISA to detect plasma isoprostane and cytokines levels. The occurrence of cardiomyocytic apoptosis was significantly less in PARP inhibitor recipients than in PARP-inhibitor-naive controls. Plasma isoprostane and various cytokines were significantly elevated in PARP-inhibitor-naive controls but significantly reduced in PARP inhibitor recipients. Western blot analysis revealed similar patterns. PARP inhibitor-supplemented crystalloid cardioplegic solution diminished postischemic cardiomyocytic apoptosis and ROS-mediated injuries after global cardiac arrest under CPB, possibly via inhibiting both caspase-dependent and -independent apoptotic pathways, which also preserved postischemic myocardial contractility.
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Affiliation(s)
- Chi-Hsiao Yeh
- Division of Thoracic & Cardiovascular Surgery, Chang Gung Memorial Hospital, 222 Mai-Chin Road, Keelung, Taiwan 204.
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44
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Abstract
Fifty years after the advent of antibiotics for clinical use, the rates of morbidity and mortality associated with bacterial meningitis remain high. The unfavourable clinical outcome is often due to intracranial complications including cerebrovascular insults, raised intracranial pressure, hydrocephalus, and brain edema. Reactive oxygen species (ROS) are known effector molecules in the antimicrobial armature of polymorphonuclear and mononuclear phagocytes. However, over the last decade, there has been a substantial body of work implicating a central role of ROS in the development of intracranial complications and brain damage in bacterial meningitis. Recently, it also became evident that reactive nitrogen species (RNS), especially nitric oxide, are important mediators of meningitis-associated pathophysiological changes, at least during the early phase of the disease. There is now substantial evidence that much of the oxidative injury associated by simultaneous production of superoxide and nitric oxide is mediated by the strong oxidant peroxynitrite. ROS and peroxynitrite can be cytotoxic via a number of independent mechanisms. Their cytotoxic effects include initiation of lipid peroxidation and induction of DNA single strand breakage. Damaged DNA activates poly(ADP-ribose) polymerase (PARP). Recent experimental data propose a role of lipid peroxidation and PARP activation in the development of meningitis-associated intracranial complications and brain injury. Agents which interfere with the production of ROS and peroxynitrite, as well as with PARP activation and lipid peroxidation may represent novel, therapeutic strategies to limit meningitis-associated brain damage, and, thus, to improve the outcome of this serious disease.
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Affiliation(s)
- Uwe Koedel
- Department of Neurology, Klinikum Grosshadern, Ludwig‐Maximilians‐University of Munich, D‐81377 Munich, Germany
| | - Hans‐Walter Pfister
- Department of Neurology, Klinikum Grosshadern, Ludwig‐Maximilians‐University of Munich, D‐81377 Munich, Germany
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45
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Das D, Mukherjee S, Das AS, Mukherjee M, Mitra C. Aqueous extract of black tea (Camellia sinensis) prevents ethanol+cholecystokinin-induced pancreatitis in a rat model. Life Sci 2006; 78:2194-203. [PMID: 16289561 DOI: 10.1016/j.lfs.2005.09.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2005] [Accepted: 09/07/2005] [Indexed: 12/22/2022]
Abstract
Black Tea Extract (BTE), a phytocompound has been attributed with a plethora of health-promoting actions. We have previously demonstrated that BTE inhibits chronic hepatitis in a rat model induced with high-fat and ethanol (EtOH). This study reports that BTE prevents altered pancreatic acinar cell functions, oxidative stress, inflammatory changes and DNA damage in the EtOH+cholecystokinin (CCK)-induced model of pancreatitis. The EtOH+CCK model rats were administered with BTE, and were examined the activity of pancreatic digestive enzymes (amylase and lipase), proinflammatory cytokines (IL-6 and TNF-alpha), oxidative and antioxidative enzymes (nitric oxide, NO; malondialdehyde, MDA; superoxide dismutase, SOD; catalase, CAT), antioxidant level (glutathione, GSH), histopathological changes and the integrity of genomic DNA. Results show that because of chronic EtOH treatment, serum level of amylase and lipase (two biomarkers for pancreatitis) and pancreatic levels of MDA and NO (two biomarkers of oxidative stress) increased significantly, which could be effectively blunted by BTE. BTE could normalize EtOH+CCK-induced suppressed activities of SOD and CAT, and GSH content of pancreatic tissue. Also, histopathological and inflammatory changes during EtOH+CCK-induced pancreatitis could be blunted by BTE. Furthermore, BTE could effectively reduce EtOH+CCK-induced increase in DNA fragmentation and damage. These findings suggest that BTE prevents pancreatitis caused by chronic EtOH+CCK toxicity presumably by enhancing antioxidant, anti-inflammatory and antiapoptotic activity in rats.
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Affiliation(s)
- Dolan Das
- Department of Physiology, Presidency College, Calcutta, India
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46
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Murashita H, Tabuchi K, Hoshino T, Tsuji S, Hara A. The effects of tempol, 3-aminobenzamide and nitric oxide synthase inhibitors on acoustic injury of the mouse cochlea. Hear Res 2006; 214:1-6. [PMID: 16516419 DOI: 10.1016/j.heares.2005.12.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2005] [Accepted: 12/15/2005] [Indexed: 11/24/2022]
Abstract
Oxygen free radicals have been implicated in the pathogenesis of acoustic injury of the cochlea. The purpose of this study was to evaluate the effects of tempol (a superoxide anion scavenger), 3-aminobenzamide (a poly (ADP-ribose) synthetase (PARS) inhibitor), N-nitro-l-arginine (a non-selective nitric oxide synthase (NOS) inhibitor), 7-nitroindazole (a selective neuronal NOS inhibitor) and aminoguanidine (a selective inducible NOS inhibitor) on acoustic injury. Mice were exposed to a 4 kHz pure tone of 110-128 dB SPL for 4h. Tempol, 3-aminobenzamide or N-nitro-l-arginine was intraperitoneally administered immediately before the onset of acoustic overexposure, while 7-nitroindazole or aminoguanidine was intraperitoneally administered every 12h starting immediately before the onset of acoustic overexposure. The threshold shift of the auditory brainstem response (ABR) and hair cell loss were then evaluated one and two weeks after acoustic overexposure. Tempol and 3-aminobenzamide significantly protected the cochlea against acoustic injury, whereas the NOS inhibitors did not exert any protective effect. These findings suggest that reactive oxygen species and PARS are involved in acoustic injury of the cochlea. However, further study is necessary to elucidate the roles of nitric oxide and nitric oxide synthase in acoustic injury.
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Affiliation(s)
- Hidekazu Murashita
- Department of Otolaryngology, Tsukuba University Hospital, Tsukuba, Japan
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47
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Steer SA, Scarim AL, Chambers KT, Corbett JA. Interleukin-1 stimulates beta-cell necrosis and release of the immunological adjuvant HMGB1. PLoS Med 2006; 3:e17. [PMID: 16354107 PMCID: PMC1316065 DOI: 10.1371/journal.pmed.0030017] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2005] [Accepted: 10/10/2005] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND There are at least two phases of beta-cell death during the development of autoimmune diabetes: an initiation event that results in the release of beta-cell-specific antigens, and a second, antigen-driven event in which beta-cell death is mediated by the actions of T lymphocytes. In this report, the mechanisms by which the macrophage-derived cytokine interleukin (IL)-1 induces beta-cell death are examined. IL-1, known to inhibit glucose-induced insulin secretion by stimulating inducible nitric oxide synthase expression and increased production of nitric oxide by beta-cells, also induces beta-cell death. METHODS AND FINDINGS To ascertain the mechanisms of cell death, the effects of IL-1 and known activators of apoptosis on beta-cell viability were examined. While IL-1 stimulates beta-cell DNA damage, this cytokine fails to activate caspase-3 or to induce phosphatidylserine (PS) externalization; however, apoptosis inducers activate caspase-3 and the externalization of PS on beta-cells. In contrast, IL-1 stimulates the release of the immunological adjuvant high mobility group box 1 protein (HMGB1; a biochemical maker of necrosis) in a nitric oxide-dependent manner, while apoptosis inducers fail to stimulate HMGB1 release. The release of HMGB1 by beta-cells treated with IL-1 is not sensitive to caspase-3 inhibition, while inhibition of this caspase attenuates beta-cell death in response to known inducers of apoptosis. CONCLUSIONS These findings indicate that IL-1 induces beta-cell necrosis and support the hypothesis that macrophage-derived cytokines may participate in the initial stages of diabetes development by inducing beta-cell death by a mechanism that promotes antigen release (necrosis) and islet inflammation (HMGB1 release).
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Affiliation(s)
- Sarah A Steer
- 1The Edward A. Doisy Department of Biochemistry and Molecular Biology, St. Louis University School of Medicine, St. Louis, Missouri, United States of America
| | - Anna L Scarim
- 1The Edward A. Doisy Department of Biochemistry and Molecular Biology, St. Louis University School of Medicine, St. Louis, Missouri, United States of America
| | - Kari T Chambers
- 1The Edward A. Doisy Department of Biochemistry and Molecular Biology, St. Louis University School of Medicine, St. Louis, Missouri, United States of America
| | - John A Corbett
- 1The Edward A. Doisy Department of Biochemistry and Molecular Biology, St. Louis University School of Medicine, St. Louis, Missouri, United States of America
- *To whom correspondence should be addressed. E-mail:
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48
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Kim JH, Yoon DW, Hur GY, Jung KH, Lee SY, Lee SY, Shin C, Shim JJ, In KH, Yoo SH, Kang KH. The Role of Poly(ADP-ribose) Polymerase-1 in Ventilator-Induced Lung Injury. Tuberc Respir Dis (Seoul) 2006. [DOI: 10.4046/trd.2006.60.4.451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Je-Hyeong Kim
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Dae Wui Yoon
- Institute of Human Genomic Study, Ansan Hospital, Korea University Medical Center, Ansan, Korea
| | - Gyu Young Hur
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Ki Hwan Jung
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Sung Yong Lee
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Sang Yeub Lee
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Chol Shin
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Jae Jeong Shim
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Kwang Ho In
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Se Hwa Yoo
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Kyung Ho Kang
- Department of Internal Medicine, College of Medicine, Korea University, Seoul, Korea
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49
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Wells GJ, Bihovsky R, Hudkins RL, Ator MA, Husten J. Synthesis and structure-activity relationships of novel pyrrolocarbazole lactam analogs as potent and cell-permeable inhibitors of poly(ADP-ribose)polymerase-1 (PARP-1). Bioorg Med Chem Lett 2005; 16:1151-5. [PMID: 16359865 DOI: 10.1016/j.bmcl.2005.11.086] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2005] [Revised: 11/24/2005] [Accepted: 11/28/2005] [Indexed: 02/04/2023]
Abstract
A series of novel pyrrolocarbazole lactams was identified as potent PARP-1 inhibitors in vitro and in a PC12 cellular NAD(+) depletion assay. The SAR trends of substituents at the 3-position, as well as the effect of blocking the indole or lactam NH-groups of the template by methylation or formylation, are discussed in relation to molecular modeling studies.
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Affiliation(s)
- Gregory J Wells
- Cephalon, Inc., 145 Brandywine Parkway, West Chester, PA 19380-4245, USA.
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50
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Mukherjee S, Das D, Mukherjee M, Das AS, Mitra C. Synergistic effect of folic acid and vitamin B12 in ameliorating arsenic-induced oxidative damage in pancreatic tissue of rat. J Nutr Biochem 2005; 17:319-27. [PMID: 16214333 DOI: 10.1016/j.jnutbio.2005.08.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2005] [Revised: 08/02/2005] [Accepted: 08/09/2005] [Indexed: 10/25/2022]
Abstract
The efficacies of two nutritional factors, folic acid and vitamin B12, were assessed in this study against arsenic-induced islet cellular toxicity. Rats were divided into four groups consisting of five rats in each group: Group A, control; Group B, arsenic-treated; Group C, arsenic+folic acid; and Group D, arsenic+folic acid+vitamin B12. The dose of arsenic, folic acid and vitamin B12, respectively, was 3 mg, 36 microg and 0.63 microg kg(-1) body weight day(-1) for 30 days. Results showed that, compared to control group, there was a significant increase in the levels of nitric oxide (NO), malondialdehyde (MDA) and hydroxyl radical (OH-) formation in the pancreatic tissue of arsenic-treated rats, while the activity of antioxidant enzymes, superoxide dismutase (SOD) and catalase (CAT), and cellular content of antioxidant glutathione (GSH) were low in these animals. The serum level of tumor necrosis factor-alpha (TNF-alpha) and IL-6 was significantly high in these animals. Light microscopic examination showed a marked fall in the number of islet cells. Concomitant administration of either folic acid or folic acid and vitamin B12 with arsenic significantly restored all these parameters. Although folic acid alone could not restore the normal level of TNF-alpha and IL-6, combined folic acid and vitamin B12 could restore it. Folic acid and vitamin B12 combined also could recover islet cell count. These results suggest that folic acid+vitamin B12 are capable of reducing arsenic-induced cellular oxidative and inflammatory toxic changes. Thus, supplement with vitamin B12+folic acid may be predicted as a possible nutritional management strategy against arsenic-induced toxicity.
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Affiliation(s)
- Sandip Mukherjee
- Department of Physiology, Presidency College, Calcutta 700 073, India
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