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Jin B, Gao Y, Fu Y, Zhang S, Zhang K, Su Y. Electroacupuncture improves cognitive function in a rat model of mild traumatic brain injury by regulating the SIRT-1/PGC-1α/mitochondrial pathway. Chin Med J (Engl) 2024; 137:711-719. [PMID: 38384159 PMCID: PMC10950173 DOI: 10.1097/cm9.0000000000003032] [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: 07/24/2023] [Indexed: 02/23/2024] Open
Abstract
BACKGROUND Mild traumatic brain injury (mTBI) is a common neurological trauma that can lead to cognitive impairment. The sirtuin-1 (SIRT-1)/peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α) pathway has been reported to have neuroprotective effects in rats with craniocerebral injury. We evaluated potential mechanisms underlying electroacupuncture-mediated recovery of cognitive function after mTBI, focusing on the SIRT-1/PGC-1α/mitochondrial pathway. METHODS We included forty 6-week-old male Sprague-Dawley rats in this study. Rats were randomly divided into four groups: controlled cortical impactor (CCI, n = 10), sham operation (sham, n = 10), electroacupuncture-treated CCI (CCI+EA, n = 10), and electroacupuncture-treated sham (sham+EA, n = 10) group. Randomization was performed by assigning a random number to each rat and using a random number table. The mTBI rat model was established using a controllable cortical impactor. Electroacupuncture therapy was performed on the back of rats, by inserting acupuncture needles to the specific acupoints and setting appropriate parameters for treatment. We evaluated spatial learning and memory functions with the Morris water maze test. We performed quantitative real-time polymerase chain reaction (qRT-PCR), western blotting, adenosine triphosphate (ATP) determination, and mitochondrial respiratory chain complex I (MRCC I) determination on rat hippocampal tissue. We analyzed SIRT-1/PGC-1α expression levels and the results of mitochondrial function assays, and compared differences between groups using bilateral Student's t -tests. RESULTS Compared with the sham group, SIRT-1/PGC-1α expression was downregulated in the hippocampus of CCI group ( P <0.01). Although this expression was upregulated following electroacupuncture, it did not reach the levels observed in the sham group ( P <0.05). Compared with the sham group, MRCC I and ATP levels in the CCI group were significantly reduced, and increased after electroacupuncture ( P <0.01). In the Morris water maze, electroacupuncture reduced the incubation period of rats and increased average speed and number of crossing platforms ( P <0.05). CONCLUSION Electroacupuncture may improve cognitive function in the mTBI rat model by regulating the SIRT-1/PGC-1α/mitochondrial pathway.
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Affiliation(s)
- Bo Jin
- Department of Neurosurgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, China
| | - Yemei Gao
- Department of Traditional Chinese Medicine, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, China
| | - Yixian Fu
- School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Suxin Zhang
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Ke Zhang
- Department of Breast Surgical Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Yibing Su
- Department of Neurosurgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, China
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Qian L, Zhu Y, Deng C, Liang Z, Chen J, Chen Y, Wang X, Liu Y, Tian Y, Yang Y. Peroxisome proliferator-activated receptor gamma coactivator-1 (PGC-1) family in physiological and pathophysiological process and diseases. Signal Transduct Target Ther 2024; 9:50. [PMID: 38424050 PMCID: PMC10904817 DOI: 10.1038/s41392-024-01756-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 01/13/2024] [Accepted: 01/23/2024] [Indexed: 03/02/2024] Open
Abstract
Peroxisome proliferator-activated receptor gamma coactivator-1 (PGC-1) family (PGC-1s), consisting of three members encompassing PGC-1α, PGC-1β, and PGC-1-related coactivator (PRC), was discovered more than a quarter-century ago. PGC-1s are essential coordinators of many vital cellular events, including mitochondrial functions, oxidative stress, endoplasmic reticulum homeostasis, and inflammation. Accumulating evidence has shown that PGC-1s are implicated in many diseases, such as cancers, cardiac diseases and cardiovascular diseases, neurological disorders, kidney diseases, motor system diseases, and metabolic disorders. Examining the upstream modulators and co-activated partners of PGC-1s and identifying critical biological events modulated by downstream effectors of PGC-1s contribute to the presentation of the elaborate network of PGC-1s. Furthermore, discussing the correlation between PGC-1s and diseases as well as summarizing the therapy targeting PGC-1s helps make individualized and precise intervention methods. In this review, we summarize basic knowledge regarding the PGC-1s family as well as the molecular regulatory network, discuss the physio-pathological roles of PGC-1s in human diseases, review the application of PGC-1s, including the diagnostic and prognostic value of PGC-1s and several therapies in pre-clinical studies, and suggest several directions for future investigations. This review presents the immense potential of targeting PGC-1s in the treatment of diseases and hopefully facilitates the promotion of PGC-1s as new therapeutic targets.
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Affiliation(s)
- Lu Qian
- Xi'an Key Laboratory of Cardiovascular and Cerebrovascular Diseases, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Northwest University, Xi'an, 710021, China
- Xi'an Key Laboratory of Innovative Drug Research for Heart Failure, Faculty of Life Sciences and Medicine, Northwest University, 229 Taibai North Road, Xi'an, 710069, China
| | - Yanli Zhu
- Xi'an Key Laboratory of Cardiovascular and Cerebrovascular Diseases, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Northwest University, Xi'an, 710021, China
- Xi'an Key Laboratory of Innovative Drug Research for Heart Failure, Faculty of Life Sciences and Medicine, Northwest University, 229 Taibai North Road, Xi'an, 710069, China
| | - Chao Deng
- Department of Cardiovascular Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710061, China
| | - Zhenxing Liang
- Department of Cardiothoracic Surgery, The First Affiliated Hospital of Zhengzhou University, 1 Jianshe East, Zhengzhou, 450052, China
| | - Junmin Chen
- Xi'an Key Laboratory of Cardiovascular and Cerebrovascular Diseases, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Northwest University, Xi'an, 710021, China
- Xi'an Key Laboratory of Innovative Drug Research for Heart Failure, Faculty of Life Sciences and Medicine, Northwest University, 229 Taibai North Road, Xi'an, 710069, China
| | - Ying Chen
- Department of Hematology, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710061, China
| | - Xue Wang
- Department of Cardiovascular Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, 277 Yanta West Road, Xi'an, 710061, China
| | - Yanqing Liu
- Xi'an Key Laboratory of Cardiovascular and Cerebrovascular Diseases, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Northwest University, Xi'an, 710021, China
- Xi'an Key Laboratory of Innovative Drug Research for Heart Failure, Faculty of Life Sciences and Medicine, Northwest University, 229 Taibai North Road, Xi'an, 710069, China
| | - Ye Tian
- Xi'an Key Laboratory of Cardiovascular and Cerebrovascular Diseases, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Northwest University, Xi'an, 710021, China
- Xi'an Key Laboratory of Innovative Drug Research for Heart Failure, Faculty of Life Sciences and Medicine, Northwest University, 229 Taibai North Road, Xi'an, 710069, China
| | - Yang Yang
- Xi'an Key Laboratory of Cardiovascular and Cerebrovascular Diseases, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Northwest University, Xi'an, 710021, China.
- Xi'an Key Laboratory of Innovative Drug Research for Heart Failure, Faculty of Life Sciences and Medicine, Northwest University, 229 Taibai North Road, Xi'an, 710069, China.
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Shehata AH, Anter AF, Ahmed ASF. Role of SIRT1 in sepsis-induced encephalopathy: Molecular targets for future therapies. Eur J Neurosci 2023; 58:4211-4235. [PMID: 37840012 DOI: 10.1111/ejn.16167] [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: 08/12/2023] [Revised: 09/22/2023] [Accepted: 09/25/2023] [Indexed: 10/17/2023]
Abstract
Sepsis induces neuroinflammation, BBB disruption, cerebral hypoxia, neuronal mitochondrial dysfunction, and cell death causing sepsis-associated encephalopathy (SAE). These pathological consequences lead to short- and long-term neurobehavioural deficits. Till now there is no specific treatment that directly improves SAE and its associated behavioural impairments. In this review, we discuss the underlying mechanisms of sepsis-induced brain injury with a focus on the latest progress regarding neuroprotective effects of SIRT1 (silent mating type information regulation-2 homologue-1). SIRT1 is an NAD+ -dependent class III protein deacetylase. It is able to modulate multiple downstream signals (including NF-κB, HMGB, AMPK, PGC1α and FoxO), which are involved in the development of SAE by its deacetylation activity. There are multiple recent studies showing the neuroprotective effects of SIRT1 in neuroinflammation related diseases. The proposed neuroprotective action of SIRT1 is meant to bring a promising therapeutic strategy for managing SAE and ameliorating its related behavioural deficits.
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Affiliation(s)
- Alaa H Shehata
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Aliaa F Anter
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Minia University, Minia, Egypt
| | - Al-Shaimaa F Ahmed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Minia University, Minia, Egypt
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Alkhaleq HA, Karram T, Fokra A, Hamoud S, Kabala A, Abassi Z. The Protective Pathways Activated in Kidneys of αMUPA Transgenic Mice Following Ischemia\Reperfusion-Induced Acute Kidney Injury. Cells 2023; 12:2497. [PMID: 37887341 PMCID: PMC10605904 DOI: 10.3390/cells12202497] [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: 07/18/2023] [Revised: 09/12/2023] [Accepted: 09/30/2023] [Indexed: 10/28/2023] Open
Abstract
Despite the high prevalence of acute kidney injury (AKI), the therapeutic approaches for AKI are disappointing. This deficiency stems from the poor understanding of the pathogenesis of AKI. Recent studies demonstrate that αMUPA, alpha murine urokinase-type plasminogen activator (uPA) transgenic mice, display a cardioprotective pathway following myocardial ischemia. We hypothesize that these mice also possess protective renal pathways. Male and female αMUPA mice and their wild type were subjected to 30 min of bilateral ischemic AKI. Blood samples and kidneys were harvested 48 h following AKI for biomarkers of kidney function, renal injury, inflammatory response, and intracellular pathways sensing or responding to AKI. αMUPA mice, especially females, exhibited attenuated renal damage in response to AKI, as was evident from lower SCr and BUN, normal renal histology, and attenuated expression of NGAL and KIM-1. Notably, αMUPA females did not show a significant change in renal inflammatory and fibrotic markers following AKI as compared with wild-type (WT) mice and αMUPA males. Moreover, αMUPA female mice exhibited the lowest levels of renal apoptotic and autophagy markers during normal conditions and following AKI. αMUPA mice, especially the females, showed remarkable expression of PGC1α and eNOS following AKI. Furthermore, MUPA mice showed a significant elevation in renal leptin expression before and following AKI. Pretreatment of αMUPA with leptin-neutralizing antibodies prior to AKI abolished their resistance to AKI. Collectively, the kidneys of αMUPA mice, especially those of females, are less susceptible to ischemic I/R injury compared to WT mice, and this is due to nephroprotective actions mediated by the upregulation of leptin, eNOS, ACE2, and PGC1α along with impaired inflammatory, fibrotic, and autophagy processes.
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Affiliation(s)
- Heba Abd Alkhaleq
- Department of Physiology and Biophysics, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (H.A.A.); (A.F.); (A.K.)
| | - Tony Karram
- Department of Vascular Surgery, Rambam Health Care Campus, Haifa 3109601, Israel;
| | - Ahmad Fokra
- Department of Physiology and Biophysics, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (H.A.A.); (A.F.); (A.K.)
| | - Shadi Hamoud
- Internal Medicine, Rambam Health Care Campus, Haifa 3109601, Israel;
| | - Aviva Kabala
- Department of Physiology and Biophysics, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (H.A.A.); (A.F.); (A.K.)
| | - Zaid Abassi
- Department of Physiology and Biophysics, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa 3109601, Israel; (H.A.A.); (A.F.); (A.K.)
- Laboratory Medicine, Rambam Health Care Campus, Haifa 3109601, Israel
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Cleveland KH, Schnellmann RG. Pharmacological Targeting of Mitochondria in Diabetic Kidney Disease. Pharmacol Rev 2023; 75:250-262. [PMID: 36781216 DOI: 10.1124/pharmrev.122.000560] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 10/03/2022] [Indexed: 12/14/2022] Open
Abstract
Diabetic kidney disease (DKD) is the leading cause of end-stage renal disease (ESRD) in the United States and many other countries. DKD occurs through a variety of pathogenic processes that are in part driven by hyperglycemia and glomerular hypertension, leading to gradual loss of kidney function and eventually progressing to ESRD. In type 2 diabetes, chronic hyperglycemia and glomerular hyperfiltration leads to glomerular and proximal tubular dysfunction. Simultaneously, mitochondrial dysfunction occurs in the early stages of hyperglycemia and has been identified as a key event in the development of DKD. Clinical management for DKD relies primarily on blood pressure and glycemic control through the use of numerous therapeutics that slow disease progression. Because mitochondrial function is key for renal health over time, therapeutics that improve mitochondrial function could be of value in different renal diseases. Increasing evidence supports the idea that targeting aspects of mitochondrial dysfunction, such as mitochondrial biogenesis and dynamics, restores mitochondrial function and improves renal function in DKD. We will review mitochondrial function in DKD and the effects of current and experimental therapeutics on mitochondrial biogenesis and homeostasis in DKD over time. SIGNIFICANCE STATEMENT: Diabetic kidney disease (DKD) affects 20% to 40% of patients with diabetes and has limited treatment options. Mitochondrial dysfunction has been identified as a key event in the progression of DKD, and pharmacologically restoring mitochondrial function in the early stages of DKD may be a potential therapeutic strategy in preventing disease progression.
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Affiliation(s)
- Kristan H Cleveland
- Pharmacology and Toxicology, University of Arizona, Tucson, Arizona (K.H.C., R.G.S.) and Southern VA Healthcare System, Tucson, Arizona (R.G.S.)
| | - Rick G Schnellmann
- Pharmacology and Toxicology, University of Arizona, Tucson, Arizona (K.H.C., R.G.S.) and Southern VA Healthcare System, Tucson, Arizona (R.G.S.)
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Yan C, Shi Y, Yuan L, Lv D, Sun B, Wang J, Liu X, An F. Mitochondrial quality control and its role in osteoporosis. Front Endocrinol (Lausanne) 2023; 14:1077058. [PMID: 36793284 PMCID: PMC9922754 DOI: 10.3389/fendo.2023.1077058] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 01/16/2023] [Indexed: 01/31/2023] Open
Abstract
Mitochondria are important organelles that provide cellular energy and play a vital role in cell differentiation and apoptosis. Osteoporosis is a chronic metabolic bone disease mainly caused by an imbalance in osteoblast and osteoclast activity. Under physiological conditions, mitochondria regulate the balance between osteogenesis and osteoclast activity and maintain bone homeostasis. Under pathological conditions, mitochondrial dysfunction alters this balance; this disruption is important in the pathogenesis of osteoporosis. Because of the role of mitochondrial dysfunction in osteoporosis, mitochondrial function can be targeted therapeutically in osteoporosis-related diseases. This article reviews different aspects of the pathological mechanism of mitochondrial dysfunction in osteoporosis, including mitochondrial fusion and fission, mitochondrial biogenesis, and mitophagy, and highlights targeted therapy of mitochondria in osteoporosis (diabetes induced osteoporosis and postmenopausal osteoporosis) to provide novel targets and prevention strategies for the prevention and treatment of osteoporosis and other chronic bone diseases.
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Affiliation(s)
- Chunlu Yan
- School of Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
- Research Center of Traditional Chinese Medicine of Gansu, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Yao Shi
- School of Basic Medicine, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Lingqing Yuan
- School of Basic Medicine, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Donghui Lv
- School of Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Bai Sun
- School of Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Jiayu Wang
- School of Traditional Chinese and Western Medicine, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
| | - Xiyan Liu
- Internal Medicine, Northwestern University, Xian, Shanxi, China
- *Correspondence: Xiyan Liu, ; Fangyu An,
| | - Fangyu An
- Teaching Experiment Training Center, Gansu University of Chinese Medicine, Lanzhou, Gansu, China
- *Correspondence: Xiyan Liu, ; Fangyu An,
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Vallorz EL, Janda J, Mansour HM, Schnellmann RG. Kidney targeting of formoterol containing polymeric nanoparticles improves recovery from ischemia reperfusion-induced acute kidney injury in mice. Kidney Int 2022; 102:1073-1089. [PMID: 35779607 DOI: 10.1016/j.kint.2022.05.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 04/22/2022] [Accepted: 05/20/2022] [Indexed: 12/14/2022]
Abstract
The β2 adrenergic receptor agonist, formoterol, is an inducer of mitochondrial biogenesis and restorer of mitochondrial and kidney function in acute and chronic models of kidney injury. Unfortunately, systemic administration of formoterol has the potential for adverse cardiovascular effects, increased heart rate, and decreased blood pressure. To minimize these effects, we developed biodegradable and biocompatible polymeric nanoparticles containing formoterol that target the kidney, thereby decreasing the effective dose, and lessen cardiovascular effects while restoring kidney function after injury. Male C57Bl/6 mice, treated with these nanoparticles daily, had reduced ischemia-reperfusion-induced serum creatinine and kidney cortex kidney injury molecule-1 levels by 78% and 73% respectively, compared to control mice six days after injury. With nanoparticle therapy, kidney cortical mitochondrial number and proteins reduced by ischemic injury, recovered to levels of sham-operated mice. Tubular necrosis was reduced 69% with nanoparticles treatment. Nanoparticles improved kidney recovery even when the dosing frequency was reduced from daily to two days per week. Finally, compared to treatment with formoterol-free drug alone, these nanoparticles did not increase heart rate nor decrease blood pressure. Thus, targeted kidney delivery of formoterol-containing nanoparticles is an improvement in standard formoterol therapy for ischemia-reperfusion-induced acute kidney injuries by decreasing the dose, dosing frequency, and cardiac side effects.
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Affiliation(s)
- Ernest L Vallorz
- Department of Pharmacology and Toxicology, The University of Arizona R. Ken Coit College of Pharmacy, Skaggs Pharmaceutical Sciences Center, Tucson, Arizona, USA
| | - Jaroslav Janda
- Department of Pharmacology and Toxicology, The University of Arizona R. Ken Coit College of Pharmacy, Skaggs Pharmaceutical Sciences Center, Tucson, Arizona, USA
| | - Heidi M Mansour
- Department of Pharmacology and Toxicology, The University of Arizona R. Ken Coit College of Pharmacy, Skaggs Pharmaceutical Sciences Center, Tucson, Arizona, USA; The University of Arizona College of Medicine, Tucson, Arizona, USA; The University of Arizona, BIO5 Institute, Tucson, Arizona, USA
| | - Rick G Schnellmann
- Department of Pharmacology and Toxicology, The University of Arizona R. Ken Coit College of Pharmacy, Skaggs Pharmaceutical Sciences Center, Tucson, Arizona, USA; The University of Arizona College of Medicine, Tucson, Arizona, USA; The University of Arizona, BIO5 Institute, Tucson, Arizona, USA; Southern Arizona VA Health Care System, USA.
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Emerging Protective Actions of PGC-1α in Diabetic Nephropathy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:6580195. [PMID: 36262282 PMCID: PMC9576408 DOI: 10.1155/2022/6580195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 09/14/2022] [Accepted: 09/26/2022] [Indexed: 11/23/2022]
Abstract
Renal impairment is affected by various mechanisms of oxidative stress, mitochondrial dysfunction, and basement membrane thickening, which are the major causes of renal dysfunction in diabetes. Of note, hyperglycemia-induced mitochondrial dysfunction has been identified as a common cause of diabetic nephropathy and renal impairment, and the decrease in PGC-1α expression brought on by hyperglycemia plays an immensurable role in both the reduction of mitochondrial biogenesis and the rise in oxidative stress. Reduced PGC-1α expression levels may occur with rising SGLT2-dependent increase of cytoplasmic sodium and protons in the renal cells of diabetes, even if the precise mechanism of hyperglycemia-induced disruption of PGC-1α expression has not been identified. Additionally, it has been observed that SGLT2 inhibitors enhance PGC-1α expression and activity and decrease cytoplasmic sodium and protons in many kidney cells, which may be helpful in reducing renal impairment brought on by diabetes. This review summarizes our and other recent studies on the function of PGC-1α in diabetic nephropathy, provides another potential mediator of the lower PGC-1α expression levels brought on by hyperglycemia in diabetics, and identifies a new pathogenesis of diabetes-related renal impairment. It also explains the mechanism underlying the protective effects of SGLT2 inhibitors on diabetic nephropathy. Therefore, it should be taken into account that SGLT2 inhibitors are an effective therapeutic strategy for reducing renal dysfunction caused by diabetes.
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Mally A, Jarzina S. Mapping Adverse Outcome Pathways for Kidney Injury as a Basis for the Development of Mechanism-Based Animal-Sparing Approaches to Assessment of Nephrotoxicity. FRONTIERS IN TOXICOLOGY 2022; 4:863643. [PMID: 35785263 PMCID: PMC9242087 DOI: 10.3389/ftox.2022.863643] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 03/11/2022] [Indexed: 02/04/2023] Open
Abstract
In line with recent OECD activities on the use of AOPs in developing Integrated Approaches to Testing and Assessment (IATAs), it is expected that systematic mapping of AOPs leading to systemic toxicity may provide a mechanistic framework for the development and implementation of mechanism-based in vitro endpoints. These may form part of an integrated testing strategy to reduce the need for repeated dose toxicity studies. Focusing on kidney and in particular the proximal tubule epithelium as a key target site of chemical-induced injury, the overall aim of this work is to contribute to building a network of AOPs leading to nephrotoxicity. Current mechanistic understanding of kidney injury initiated by 1) inhibition of mitochondrial DNA polymerase γ (mtDNA Polγ), 2) receptor mediated endocytosis and lysosomal overload, and 3) covalent protein binding, which all present fairly well established, common mechanisms by which certain chemicals or drugs may cause nephrotoxicity, is presented and systematically captured in a formal description of AOPs in line with the OECD AOP development programme and in accordance with the harmonized terminology provided by the Collaborative Adverse Outcome Pathway Wiki. The relative level of confidence in the established AOPs is assessed based on evolved Bradford-Hill weight of evidence considerations of biological plausibility, essentiality and empirical support (temporal and dose-response concordance).
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Regulation of Mitochondrial Homeostasis and Nrf2 in Kidney Disease: Timing Is Critical. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:9275056. [PMID: 35528519 PMCID: PMC9072027 DOI: 10.1155/2022/9275056] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 04/18/2022] [Indexed: 02/07/2023]
Abstract
Abnormal regulation of mitochondrial homeostasis plays a critical role in the progression of renal disease. Recent studies have shown that activation of nuclear factor erythroid 2-related factor 2 (Nrf2) has time-dependent protective effects, which can be explained by the differing regulation of mitochondrial homeostasis during the various stages of kidney disease. In this review, we summarize the mechanisms whereby mitochondrial homeostasis is regulated and the nature of the dysregulation of mitochondrial homeostasis in renal disease. In addition, we summarize the dual roles of Nrf2 in kidney disease by discussing the studies that have shown the importance of the timing of its activation in the regulation of mitochondrial homeostasis. This should provide a theoretical basis for therapeutic strategies aimed at activating Nrf2 in kidney disease.
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McCrimmon A, Cahill KM, Kruger C, Mangelli ME, Bouffard E, Dobroski T, Michanczyk KN, Burke SJ, Noland RC, Ilatovskaya DV, Stadler K. Intact mitochondrial substrate efflux is essential for prevention of tubular injury in a sex-dependent manner. JCI Insight 2022; 7:e150696. [PMID: 35230975 PMCID: PMC9057616 DOI: 10.1172/jci.insight.150696] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 02/23/2022] [Indexed: 11/17/2022] Open
Abstract
The importance of healthy mitochondrial function is implicated in the prevention of chronic kidney disease (CKD) and diabetic kidney disease (DKD). Sex differences also play important roles in DKD. Our previous studies revealed that mitochondrial substrate overload (modeled by homozygous deletion of carnitine acetyl-transferase [CrAT]) in proximal tubules causes renal injury. Here, we demonstrate the importance of intact mitochondrial substrate efflux by titrating the amount of overload through the generation of a heterozygous CrAT-KO model (PT-CrATHET mouse). Intriguingly, these animals developed renal injury similarly to their homozygous counterparts. Mitochondria were structurally and functionally impaired in both sexes. Transcriptomic analyses, however, revealed striking sex differences. Male mice shut down fatty acid oxidation and several other metabolism-related pathways. Female mice had a significantly weaker transcriptional response in metabolism, but activation of inflammatory pathways was prominent. Proximal tubular cells from PT-CrATHET mice of both sexes exhibited a shift toward a more glycolytic phenotype, but female mice were still able to oxidize fatty acid-based substrates. Our results demonstrate that maintaining mitochondrial substrate metabolism balance is crucial to satisfying proximal tubular energy demand. Our findings have potentially broad implications, as both the glycolytic shift and the sexual dimorphisms discovered herein offer potentially new modalities for future interventions for treating kidney disease.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Robert C. Noland
- Skeletal Muscle Metabolism Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana, USA
| | - Daria V. Ilatovskaya
- Department of Physiology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA
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Li Z, Lu S, Li X. The role of metabolic reprogramming in tubular epithelial cells during the progression of acute kidney injury. Cell Mol Life Sci 2021; 78:5731-5741. [PMID: 34185125 PMCID: PMC11073237 DOI: 10.1007/s00018-021-03892-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 06/01/2021] [Accepted: 06/25/2021] [Indexed: 12/18/2022]
Abstract
Acute kidney injury (AKI) is one of the most common clinical syndromes. AKI is associated with significant morbidity and subsequent chronic kidney disease (CKD) development. Thus, it is urgent to develop a strategy to hinder AKI progression. Renal tubules are responsible for the reabsorption and secretion of various solutes and the damage to this part of the nephron is a key mediator of AKI. As we know, many common renal insults primarily target the highly metabolically active proximal tubular cells (PTCs). PTCs are the most energy-demanding cells in the kidney. The ATP that they use is mostly produced in their mitochondria by fatty acid β-oxidation (FAO). But, when PTCs face various biological stresses, FAO will shut down for a time that outlives injury. Recent studies have suggested that surviving PTCs can adapt to FAO disruption by increasing glycolysis when facing metabolic constraints, although PTCs do not perform glycolysis in a normal physiological state. Enhanced glycolysis in a short period compensates for impaired energy production and exerts partial renal-protective effects, but its long-term effect on renal function and AKI progression is not promising. Deranged FAO and enhanced glycolysis may contribute to the AKI to CKD transition through different molecular biological mechanisms. In this review, we concentrate on the recent pathological findings of AKI with regards to the metabolic reprogramming in PTCs, confirming that targeting metabolic reprogramming represents a potentially effective therapeutic strategy for the progression of AKI.
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Affiliation(s)
- Zhenzhen Li
- Medicial Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China.
| | - Shan Lu
- Emergency Department, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Xiaobing Li
- College of Basic Medicine, Henan University of Traditional Chinese Medicine, Zhengzhou, 450000, China
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13
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Ding M, Tolbert E, Birkenbach M, Gohh R, Akhlaghi F, Ghonem NS. Treprostinil reduces mitochondrial injury during rat renal ischemia-reperfusion injury. Biomed Pharmacother 2021; 141:111912. [PMID: 34328097 DOI: 10.1016/j.biopha.2021.111912] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/22/2021] [Accepted: 07/06/2021] [Indexed: 10/20/2022] Open
Abstract
BACKGROUND Renal ischemia-reperfusion injury (IRI) is a major factor contributing to acute kidney injury and it is associated with a high morbidity and mortality if untreated. Renal IRI depletes cellular and tissue adenosine triphosphate (ATP), which compromises mitochondrial function, further exacerbating renal tubular injury. Currently, no treatment for IRI is available. This study investigates the protective role of treprostinil in improving mitochondria biogenesis and recovery during rat renal IRI. METHODS Male Sprague Dawley rats were randomly assigned to groups: control, sham, IRI-placebo or IRI-treprostinil and subjected to 45 min of bilateral renal ischemia followed by 1-72 h reperfusion. Placebo or treprostinil (100 ng/kg/min) was administered subcutaneously via an osmotic minipump. RESULTS Treprostinil significantly reduced peak elevated serum creatinine (SCr) levels and accelerated normalization relative to IRI-placebo (p < 0.0001). Treatment with treprostinil also inhibited IRI-mediated renal apoptosis, mitochondrial oxidative injury (p < 0.05), and the release of cytochrome c (p < 0.01) vs. IRI-placebo. In addition, treprostinil preserved renal mitochondrial DNA copy number (p < 0.0001) and renal ATP levels (p < 0.05) to nearly those of sham-operated animals. Non-targeted semi-quantitative proteomics showed reduced levels of ATP synthase subunits in the IRI-placebo group which were restored to sham levels by treprostinil treatment (p < 0.05). Furthermore, treprostinil reduced renal IRI-induced upregulated Drp1 and pErk protein levels, and restored Sirt3 and Pgc-1α levels to baseline (p < 0.05). CONCLUSIONS Treprostinil reduces mitochondrial-mediated renal apoptosis, inhibits mitochondria fission, and promotes mitochondria fusion, thereby accelerating mitochondrial recovery and protecting renal proximal tubules from renal IRI. These results support the clinical investigation of treprostinil as a viable therapy to reduce renal IRI.
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Affiliation(s)
- Meiwen Ding
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 0288, USA
| | - Evelyn Tolbert
- Division of Renal Disease, Department of Medicine, Rhode Island Hospital, Warren Alpert School of Medicine Brown University, 222 Richmond Street, Providence, RI 02903, USA
| | - Mark Birkenbach
- Department of Pathology, Rhode Island Hospital, Warren Alpert School of Medicine Brown University, 222 Richmond Street, Providence, RI 02903, USA
| | - Reginald Gohh
- Division of Organ Transplantation, Rhode Island Hospital, Warren Alpert School of Medicine Brown University, 222 Richmond Street, Providence, RI 02903, USA
| | - Fatemeh Akhlaghi
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 0288, USA
| | - Nisanne S Ghonem
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 0288, USA.
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14
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Vallorz EL, Blohm-Mangone K, Schnellmann RG, Mansour HM. Formoterol PLGA-PEG Nanoparticles Induce Mitochondrial Biogenesis in Renal Proximal Tubules. AAPS JOURNAL 2021; 23:88. [PMID: 34169439 DOI: 10.1208/s12248-021-00619-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 06/04/2021] [Indexed: 11/30/2022]
Abstract
Formoterol is a long-acting β2 agonist (LABA). Agonism of the β2-adrenergic receptor by formoterol is known to stimulate mitochondrial biogenesis (MB) in renal proximal tubules and recover kidney function. However, formoterol has a number of cardiovascular side effects that limits its usage. The goal of this study was to design and develop an intravenous biodegradable and biocompatible polymeric nanoparticle delivery system that targets formoterol to the kidney. Poly(ethylene glycol) methyl ether-block-poly(lactide-co-glycolide) nanoparticles containing encapsulated formoterol were synthesized by a modified single-emulsion solvent evaporation technique resulting in nanoparticles with a median hydrodynamic diameter of 442 + 17 nm. Using primary cell cultures of rabbit renal proximal tubular cells (RPTCs), free formoterol, encapsulated formoterol polymeric nanoparticles, and drug-free polymeric nanoparticles were biocompatible and not cytotoxic over a wide concentration range. In healthy male mice, polymeric nanoparticles were shown to localize in tubules of the renal cortex and improved the renal localization of encapsulated formoterol compared to the free formoterol. At a lower total formoterol dose, the nanoparticle localization resulted in increased expression of peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α), the master regulator of MB, and increased electron transport chain proteins, markers of MB. This was confirmed by direct visual quantification of mitochondria and occurred with both free formoterol and the encapsulated formoterol polymeric nanoparticles. At the same time, localization of nanoparticles to the kidneys resulted in reduced induction of MB markers in the heart. These new nanoparticles effectively target formoterol to the kidney and successfully produce MB in the kidney.
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Affiliation(s)
- Ernest L Vallorz
- Department of Pharmacology and Toxicology, The University of Arizona College of Pharmacy, Tucson, Arizona, 85721, USA
| | - Karen Blohm-Mangone
- Department of Pharmacology and Toxicology, The University of Arizona College of Pharmacy, Tucson, Arizona, 85721, USA
| | - Rick G Schnellmann
- Department of Pharmacology and Toxicology, The University of Arizona College of Pharmacy, Tucson, Arizona, 85721, USA.,Department of Medicine, The University of Arizona College of Medicine, Tucson, Arizona, 85724, USA.,BIO5 Institute, The University of Arizona, Tucson, Arizona, 85719, USA.,Southern Arizona VA Health Care System, Tucson, Arizona, 85723, USA
| | - Heidi M Mansour
- Department of Pharmacology and Toxicology, The University of Arizona College of Pharmacy, Tucson, Arizona, 85721, USA. .,Department of Medicine, The University of Arizona College of Medicine, Tucson, Arizona, 85724, USA. .,BIO5 Institute, The University of Arizona, Tucson, Arizona, 85719, USA. .,Colleges of Pharmacy & Medicine, The University of Arizona, 1703 E. Mabel St, Tucson, Arizona, 85721-0207, USA.
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15
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Pathophysiology of diabetic kidney disease: impact of SGLT2 inhibitors. Nat Rev Nephrol 2021; 17:319-334. [PMID: 33547417 DOI: 10.1038/s41581-021-00393-8] [Citation(s) in RCA: 230] [Impact Index Per Article: 76.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2021] [Indexed: 01/30/2023]
Abstract
Diabetic kidney disease is the leading cause of kidney failure worldwide; in the USA, it accounts for over 50% of individuals entering dialysis or transplant programmes. Unlike other complications of diabetes, the prevalence of diabetic kidney disease has failed to decline over the past 30 years. Hyperglycaemia is the primary aetiological factor responsible for the development of diabetic kidney disease. Once hyperglycaemia becomes established, multiple pathophysiological disturbances, including hypertension, altered tubuloglomerular feedback, renal hypoxia, lipotoxicity, podocyte injury, inflammation, mitochondrial dysfunction, impaired autophagy and increased activity of the sodium-hydrogen exchanger, contribute to progressive glomerular sclerosis and the decline in glomerular filtration rate. The quantitative contribution of each of these abnormalities to the progression of diabetic kidney disease, as well as their role in type 1 and type 2 diabetes mellitus, remains to be determined. Sodium-glucose co-transporter 2 (SGLT2) inhibitors have a beneficial impact on many of these pathophysiological abnormalities; however, as several pathophysiological disturbances contribute to the onset and progression of diabetic kidney disease, multiple agents used in combination will likely be required to slow the progression of disease effectively.
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16
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Nebbioso M, Lambiase A, Armentano M, Tucciarone G, Sacchetti M, Greco A, Alisi L. Diabetic retinopathy, oxidative stress, and sirtuins: an in depth look in enzymatic patterns and new therapeutic horizons. Surv Ophthalmol 2021; 67:168-183. [PMID: 33864872 DOI: 10.1016/j.survophthal.2021.04.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 04/03/2021] [Accepted: 04/05/2021] [Indexed: 12/16/2022]
Abstract
Diabetic retinopathy (DR) is one of the leading causes of blindness in the world. DR represents the most common microvascular complication of diabetes, and its incidence is constantly rising. The complex interactions between inflammation, oxidative stress, and the production of free oxygen radicals caused by prolonged exposure to hyperglycemia determine the development of DR. Sirtuins (SIRTs) are a recently discovered class of 7 histone deacetylases involved in cellular senescence, regulation of cell cycle, metabolic pathways, and DNA repair. SIRTs participate in the progress of several pathologies such as cancer, neurodegeneration, and metabolic diseases. In DR sirtuins 1,3,5, and 6 play an important role as they regulate the activation of the inflammatory response, insulin sensibility, and both glycolysis and gluconeogenesis. A wide spectrum of direct and indirect activators of SIRTs pathways (e.g., antagomiR, resveratrol, or glycyrrhizin) is currently being developed to treat the inflammatory cascade occurring in DR. We focus on the main metabolic and inflammatory pathways involving SIRTs and DR, as well as recent evidence on SIRTs activators that may be employed as novel therapeutic approaches to DR.
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Affiliation(s)
- Marcella Nebbioso
- Department of Sense Organs, Faculty of Medicine and Odontology, Policlinico Umberto I. Sapienza University of Rome, v. le del Policlinico 155, 00161 Rome, Italy
| | - Alessandro Lambiase
- Department of Sense Organs, Faculty of Medicine and Odontology, Policlinico Umberto I. Sapienza University of Rome, v. le del Policlinico 155, 00161 Rome, Italy.
| | - Marta Armentano
- Department of Sense Organs, Faculty of Medicine and Odontology, Policlinico Umberto I. Sapienza University of Rome, v. le del Policlinico 155, 00161 Rome, Italy
| | - Giosuè Tucciarone
- Department of Sense Organs, Faculty of Medicine and Odontology, Policlinico Umberto I. Sapienza University of Rome, v. le del Policlinico 155, 00161 Rome, Italy
| | - Marta Sacchetti
- Department of Sense Organs, Faculty of Medicine and Odontology, Policlinico Umberto I. Sapienza University of Rome, v. le del Policlinico 155, 00161 Rome, Italy
| | - Antonio Greco
- Department of Sense Organs, Faculty of Medicine and Odontology, Policlinico Umberto I. Sapienza University of Rome, v. le del Policlinico 155, 00161 Rome, Italy
| | - Ludovico Alisi
- Department of Sense Organs, Faculty of Medicine and Odontology, Policlinico Umberto I. Sapienza University of Rome, v. le del Policlinico 155, 00161 Rome, Italy
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17
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Wang Y, Wang Y, Yang M, Ma X. Implication of cellular senescence in the progression of chronic kidney disease and the treatment potencies. Biomed Pharmacother 2021; 135:111191. [PMID: 33418306 DOI: 10.1016/j.biopha.2020.111191] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/18/2020] [Accepted: 12/26/2020] [Indexed: 12/15/2022] Open
Abstract
Chronic kidney disease (CKD) is an increasing major public health problem worldwide. And CKD shares numerous phenotypic similarities with kidney as well as systemic ageing. Cellular senescence is mainly characterized by a stable cell cycle arrest, senescence-associated secretory phenotype (SASP) and senescent cell anti-apoptotic pathways (SCAPs). Herein, the regulations and the internal mechanisms of cellular senescence will be discussed. Meanwhile, efforts are made to give a comprehensive overview of the recent advances of the implication of cellular senescence in CKD. To date, numerous studies have focused on the effects of ageing risk factors in kidney and thereby trying to interrupt the kidney ageing processes with senolytics. Interestingly, some of them showed enormous clinical application potentials. Therefore, senotherapeutics can be applied as novel potential strategies for the treatment of CKD.
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Affiliation(s)
- Yao Wang
- Department of Nephrology, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, Jiangsu, China
| | - Ying Wang
- Department of Endocrinology, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, Jiangsu, China
| | - Ming Yang
- Department of Nephrology, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, Jiangsu, China.
| | - Xingjie Ma
- Department of Intensive Care, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, Jiangsu, China.
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18
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Critical hubs of renal ischemia-reperfusion injury: endoplasmic reticulum-mitochondria tethering complexes. Chin Med J (Engl) 2020; 133:2599-2609. [PMID: 32960842 PMCID: PMC7722596 DOI: 10.1097/cm9.0000000000001091] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Mitochondrial injury and endoplasmic reticulum (ER) stress are considered to be the key mechanisms of renal ischemia-reperfusion (I/R) injury. Mitochondria are membrane-bound organelles that form close physical contact with a specific domain of the ER, known as mitochondrial-associated membranes. The close physical contact between them is mainly restrained by ER-mitochondria tethering complexes, which can play an important role in mitochondrial damage, ER stress, lipid homeostasis, and cell death. Several ER-mitochondria tethering complex components are involved in the process of renal I/R injury. A better understanding of the physical and functional interaction between ER and mitochondria is helpful to further clarify the mechanism of renal I/R injury and provide potential therapeutic targets. In this review, we aim to describe the structure of the tethering complex and elucidate its pivotal role in renal I/R injury by summarizing its role in many important mechanisms, such as mitophagy, mitochondrial fission, mitochondrial fusion, apoptosis and necrosis, ER stress, mitochondrial substance transport, and lipid metabolism.
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19
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Chambers JM, Wingert RA. PGC-1α in Disease: Recent Renal Insights into a Versatile Metabolic Regulator. Cells 2020; 9:E2234. [PMID: 33022986 PMCID: PMC7601329 DOI: 10.3390/cells9102234] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 12/14/2022] Open
Abstract
Peroxisome proliferator-activated receptor gamma co-activator 1 alpha (PGC-1α) is perhaps best known as a master regulator of mitochondrial biogenesis and function. However, by virtue of its interactions as a coactivator for numerous nuclear receptors and transcription factors, PGC-1α also regulates many tissue-specific tasks that include adipogenesis, angiogenesis, gluconeogenesis, heme biosynthesis, thermogenesis, and cellular protection against degeneration. Knowledge about these functions continue to be discovered with ongoing research. Unsurprisingly, alterations in PGC-1α expression lead to a range of deleterious outcomes. In this review, we provide a brief background on the PGC-1 family with an overview of PGC-1α's roles as an adaptive link to meet cellular needs and its pathological consequences in several organ contexts. Among the latter, kidney health is especially reliant on PGC-1α. Thus, we discuss here at length how changes in PGC-1α function impact the states of renal cancer, acute kidney injury (AKI) and chronic kidney disease (CKD), as well as emerging data that illuminate pivotal roles for PGC-1α during renal development. We survey a new intriguing association of PGC-1α function with ciliogenesis and polycystic kidney disease (PKD), where recent animal studies revealed that embryonic renal cyst formation can occur in the context of PGC-1α deficiency. Finally, we explore future prospects for PGC-1α research and therapeutic implications for this multifaceted coactivator.
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Affiliation(s)
- Joseph M. Chambers
- College of Pharmacy, Natural and Health Sciences, Manchester University, Fort Wayne, IN 46845, USA
| | - Rebecca A. Wingert
- Department of Biological Sciences, Center for Stem Cells and Regenerative Medicine, Center for Zebrafish Research, Boler-Parseghian Center for Rare and Neglected Diseases, University of Notre Dame, Notre Dame, IN 46556, USA
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20
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Rahbar Saadat Y, Hosseiniyan Khatibi SM, Ardalan M, Barzegari A, Zununi Vahed S. Molecular pathophysiology of acute kidney injury: The role of sirtuins and their interactions with other macromolecular players. J Cell Physiol 2020; 236:3257-3274. [PMID: 32989772 DOI: 10.1002/jcp.30084] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 09/12/2020] [Accepted: 09/16/2020] [Indexed: 12/12/2022]
Abstract
Acute kidney injury (AKI), a rapid drop in kidney function, displays high mortality and morbidity, and its repeated or severe status can shift into chronic kidney disease or even end-stage renal disease. How and which events cause AKI still is controversial. In addition, no specific therapies have emerged that can attenuate AKI or expedite recovery. Some central mechanisms including tubular epithelial cells injury, endothelial injury, renal cell apoptosis, and necrosis signaling cascades, and inflammation have been reported in the pathophysiology of AKI. However, the timing of the activation of each pathway, their interactions, and the hierarchy of these pathways remain unknown. The main molecular mechanisms that might be complicated in this process are the mitochondrial impairment and alteration/shifting of cellular metabolites (e.g., acetyl-CoA and NAD+ /NADH) acting as cofactors to alter the activities of many enzymes, for instance, sirtuins. Moreover, alteration of mitochondrial structure over the fusion and fission mechanisms can regulate cellular signaling pathways by modifying the rate of reactive oxygen species generation and metabolic activities. The aim of this review is to better understand the underlying pathophysiological and molecular mechanisms of AKI. In addition, we predicted the main other molecular players in interaction with sirtuins as energy/stresses monitoring proteins for the development of future approaches in the treatment or prevention of ischemic AKI.
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Affiliation(s)
- Yalda Rahbar Saadat
- Nutrition Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | | | - Abolfazl Barzegari
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran.,INSERM U1148, Laboratory for Vascular Translational Science, Cardiovascular Bioengineering, Université Sorbonne Paris Nord, Villetaneuse, France
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21
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Sivalingam K, Cirino TJ, McLaughlin JP, Samikkannu T. HIV-Tat and Cocaine Impact Brain Energy Metabolism: Redox Modification and Mitochondrial Biogenesis Influence NRF Transcription-Mediated Neurodegeneration. Mol Neurobiol 2020; 58:490-504. [PMID: 32978730 DOI: 10.1007/s12035-020-02131-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 09/14/2020] [Indexed: 02/07/2023]
Abstract
HIV infection and drugs of abuse induce oxidative stress and redox imbalance, which cause neurodegeneration. The mechanisms by which HIV infection and cocaine consumption affect astrocyte energy metabolism, and how this leads to neurodegenerative dysfunction, remain poorly understood. Presently, we investigated how oxidative injury causes the depletion of energy resources and glutathione synthetase (GSS), which in turn activates 5' AMP-activated protein kinase (AMPK), glycolytic enzymes, and mitochondrial biogenesis, finally resulting in nuclear factor erythroid (NRF) transcription in astrocytes. Both human primary astrocytes incubated with HIV-1 Tat protein in vitro and HIV-inducible Tat (iTat) mice exposed to cocaine showed decreased levels of GSS and increased superoxide dismutase (SOD) levels. These changes, in turn, significantly activated AMPK and raised the concentrations of several glycolytic enzymes, along with oxidative phosphorylation, the mitochondrial biogenesis of peroxisome proliferator-activated receptor-γ coactivator (PGC-1α) and mitochondrial transcription factor (TFAM), and Nrf1 and Nrf2 gene transcription and protein expression. Moreover, neurons exposed to HIV-1Tat/cocaine-conditioned media showed reductions in dendritic formation, spine density, and neuroplasticity compared with control neurons. These results suggest that redox inhibition of GSS altered AMPK activation and mitochondrial biogenesis to influence Nrf transcription. These processes are important components of the astrocyte signaling network regulating brain energy metabolism in HIV-positive cocaine users. In conclusion, HIV-1 Tat alters redox inhibition, thus increasing glycolytic metabolic profiles and mitochondrial biogenesis, leading to Nrf transcription, and ultimately impacting astrocyte energy resource and metabolism. Cocaine exacerbated these effects, leading to a worsening of neurodegeneration.
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Affiliation(s)
- Kalaiselvi Sivalingam
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M University, 1010 W Avenue B, Kingsville, TX, 78363, USA
| | - Thomas J Cirino
- Department of Pharmacodynamics, College of Pharmacy, University of Florida, Gainesville, FL, 32611, USA
| | - Jay P McLaughlin
- Department of Pharmacodynamics, College of Pharmacy, University of Florida, Gainesville, FL, 32611, USA
| | - Thangavel Samikkannu
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M University, 1010 W Avenue B, Kingsville, TX, 78363, USA.
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22
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Justin A, Ashwini P, Jose JA, Jeyarani V, Dhanabal SP, Manisha C, Mandal SP, Bhavimani G, Prabitha P, Yuvaraj S, Prashantha Kumar BR. Two Rationally Identified Novel Glitazones Reversed the Behavioral Dysfunctions and Exhibited Neuroprotection Through Ameliorating Brain Cytokines and Oxy-Radicals in ICV-LPS Neuroinflammatory Rat Model. Front Neurosci 2020; 14:530148. [PMID: 33100954 PMCID: PMC7546828 DOI: 10.3389/fnins.2020.530148] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 08/26/2020] [Indexed: 12/11/2022] Open
Abstract
The present study has planned to evaluate the neuroprotective activity of two novel glitazones in a neuroinflammatory rat model. Two novel glitazones were selected from an in-house virtual library of glitazones based on their docking scores against peroxisome proliferator-activated receptor-gamma (PPAR-γ) protein and other parameters studied in in silico computational studies. Initially, an acute oral toxicity study was carried out for glitazones in rats to assess the toxicity profile and to determine the therapeutic range for neuroprotective evaluation. Prior to induction of neuroinflammation, the treatments with glitazones (G1 and G2) and standard pioglitazone were made for four consecutive days to respective groups. On the fifth day, the neuroinflammation was induced by intracerebroventricular (ICV) administration of lipopolysaccharides (LPS) (2 μg/μl) using stereotaxic apparatus. After 7 days, the rats were subjected to behavioral assessment followed by neurobiochemical evaluation and histopathological studies. The pre-treatment with glitazones at two dose levels (15 and 30 mg/kg) has significantly reversed behavioral dysfunctions. Glitazones have shown significant reduction in the levels of LPO, NO, TNF-α, and IL-1β and also increased the levels of antioxidant enzymes such as SOD, CAT, and GSH in the brain of LPS-administered rats. The neuroprotection exhibited by two novel glitazones is comparable with standard pioglitazone. The PPAR-γ-dependent amelioration of cytokines and oxy-radicals released by novel glitazones during neuroinflammatory conditions may be attributed to the reversal of behavioral dysfunctions through preventing the degeneration of neurons in major regions of the brain.
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Affiliation(s)
- Antony Justin
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, India
| | - Premkumar Ashwini
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, India
| | - Jincy A Jose
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, India
| | - Victoria Jeyarani
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, India
| | - S P Dhanabal
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, India
| | - Chennu Manisha
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, India
| | - Subhankar P Mandal
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, India
| | - Guru Bhavimani
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, India
| | - P Prabitha
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, India
| | - S Yuvaraj
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, India
| | - B R Prashantha Kumar
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, India
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23
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Collier JB, Schnellmann RG. Extracellular signal-regulated kinase 1/2 regulates NAD metabolism during acute kidney injury through microRNA-34a-mediated NAMPT expression. Cell Mol Life Sci 2020; 77:3643-3655. [PMID: 31873757 PMCID: PMC11104937 DOI: 10.1007/s00018-019-03391-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 10/26/2019] [Accepted: 11/20/2019] [Indexed: 02/07/2023]
Abstract
Prior studies have established the important role of extracellular signal-regulated kinase 1/2 (ERK1/2) as a mediator of acute kidney injury (AKI). We demonstrated rapid ERK1/2 activation induced renal dysfunction following ischemia/reperfusion (IR)-induced AKI and downregulated the mitochondrial biogenesis (MB) regulator, peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) in mice. In this study, ERK1/2 regulation of cellular nicotinamide adenine dinucleotide (NAD) and PGC-1α were explored. Inhibition of ERK1/2 activation during AKI in mice using the MEK1/2 inhibitor, trametinib, attenuated renal cortical oxidized NAD (NAD+) depletion. The rate-limiting NAD biosynthesis salvage enzyme, NAMPT, decreased following AKI, and this decrease was prevented by ERK1/2 inhibition. The microRNA miR34a decreased with the inhibition of ERK1/2, leading to increased NAMPT protein. Mice treated with a miR34a mimic prevented increases in NAMPT protein in the renal cortex in the presence of ERK1/2 inhibition. In addition, ERK1/2 activation increased acetylated PGC-1α, the less active form, whereas inhibition of ERK1/2 activation prevented an increase in acetylated PGC-1α after AKI through SIRT1 and NAD+ attenuation. These results implicate IR-induced ERK1/2 activation as an important contributor to the downregulation of both PGC-1α and NAD+ pathways that ultimately decrease cellular metabolism and renal function. Inhibition of ERK1/2 activation prior to the initiation of IR injury attenuated decreases in PGC-1α and NAD+ and prevented kidney dysfunction.
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Affiliation(s)
- Justin B Collier
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC, USA.
- Immunity, Inflammation and Disease Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA.
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ, USA.
| | - Rick G Schnellmann
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson, AZ, USA
- Southern Arizona VA Health Care System, Tucson, AZ, USA
- Southwest Environmental Health Science Center, University of Arizona, Tucson, AZ, USA
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Prashantha Kumar BR, Kumar AP, Jose JA, Prabitha P, Yuvaraj S, Chipurupalli S, Jeyarani V, Manisha C, Banerjee S, Jeyabalan JB, Mohankumar SK, Dhanabal SP, Justin A. Minutes of PPAR-γ agonism and neuroprotection. Neurochem Int 2020; 140:104814. [PMID: 32758586 DOI: 10.1016/j.neuint.2020.104814] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 07/08/2020] [Accepted: 07/13/2020] [Indexed: 12/25/2022]
Abstract
Peroxisome proliferator-activated receptor gamma (PPAR-γ) is one of the ligand-activated transcription factors which regulates a number of central events and considered as a promising target for various neurodegenerative disease conditions. Numerous reports implicate that PPAR-γ agonists have shown neuroprotective effects by regulating genes transcription associated with the pathogenesis of neurodegeneration. In regards, this review critically appraises the recent knowledge of PPAR-γ receptors in neuroprotection in order to hypothesize potential neuroprotective mechanism of PPAR-γ agonism in chronic neurological conditions. Of note, the PPAR-γ's interaction dynamics with PPAR-γ coactivator-1α (PGC-1α) has gained significant attention for neuroprotection. Likewise, a plethora of studies suggest that the PPAR-γ pathway can be actuated by the endogenous ligands present in the CNS and thus identification and development of novel agonist for the PPAR-γ receptor holds a vow to prevent neurodegeneration. Together, the critical insights of this review enlighten the translational possibilities of developing novel neuroprotective therapeutics targeting PPAR-γ for various neurodegenerative disease conditions.
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Affiliation(s)
- B R Prashantha Kumar
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, Karnataka, India
| | - Ashwini Prem Kumar
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - Jincy A Jose
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - P Prabitha
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, Karnataka, India
| | - S Yuvaraj
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Mysuru, Karnataka, India
| | - Sandhya Chipurupalli
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - Victoria Jeyarani
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - Chennu Manisha
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - Sayani Banerjee
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - Jeyaram Bharathi Jeyabalan
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - Suresh Kumar Mohankumar
- TIFAC CORE in HD, Department of Pharmacognosy, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - S P Dhanabal
- TIFAC CORE in HD, Department of Pharmacognosy, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India
| | - Antony Justin
- Department of Pharmacology, JSS Academy of Higher Education & Research, JSS College of Pharmacy, Ooty, Nilgiris, Tamilnadu, India.
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25
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Zhang W, Li X, Wang S, Chen Y, Liu H. Regulation of TFEB activity and its potential as a therapeutic target against kidney diseases. Cell Death Discov 2020; 6:32. [PMID: 32377395 PMCID: PMC7195473 DOI: 10.1038/s41420-020-0265-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/20/2020] [Accepted: 04/09/2020] [Indexed: 12/24/2022] Open
Abstract
The transcription factor EB (TFEB) regulates the expression of target genes bearing the Coordinated Lysosomal Expression and Regulation (CLEAR) motif, thereby modulating autophagy and lysosomal biogenesis. Furthermore, TFEB can bind to the promoter of autophagy-associated genes and induce the formation of autophagosomes, autophagosome-lysosome fusion, and lysosomal cargo degradation. An increasing number of studies have shown that TFEB stimulates the intracellular clearance of pathogenic factors by enhancing autophagy and lysosomal function in multiple kidney diseases, such as cystinosis, acute kidney injury, and diabetic nephropathy. Taken together, this highlights the importance of developing novel therapeutic strategies against kidney diseases based on TFEB regulation. In this review, we present an overview of the current data on TFEB and its implication in kidney disease.
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Affiliation(s)
- Weihuang Zhang
- Institute of Nephrology, and Key Laboratory of Prevention and Management of Chronic Kidney Disease of Zhanjiang City, Affiliated Hospital of Guangdong Medical University, 524001 Zhanjiang, Guangdong China
| | - Xiaoyu Li
- Institute of Nephrology, and Key Laboratory of Prevention and Management of Chronic Kidney Disease of Zhanjiang City, Affiliated Hospital of Guangdong Medical University, 524001 Zhanjiang, Guangdong China
| | - Shujun Wang
- Institute of Nephrology, and Key Laboratory of Prevention and Management of Chronic Kidney Disease of Zhanjiang City, Affiliated Hospital of Guangdong Medical University, 524001 Zhanjiang, Guangdong China
| | - Yanse Chen
- Institute of Nephrology, and Key Laboratory of Prevention and Management of Chronic Kidney Disease of Zhanjiang City, Affiliated Hospital of Guangdong Medical University, 524001 Zhanjiang, Guangdong China
| | - Huafeng Liu
- Institute of Nephrology, and Key Laboratory of Prevention and Management of Chronic Kidney Disease of Zhanjiang City, Affiliated Hospital of Guangdong Medical University, 524001 Zhanjiang, Guangdong China
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26
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Nishigaki A, Kido T, Kida N, Kakita‐Kobayashi M, Tsubokura H, Hisamatsu Y, Okada H. Resveratrol protects mitochondrial quantity by activating SIRT1/PGC-1α expression during ovarian hypoxia. Reprod Med Biol 2020; 19:189-197. [PMID: 32273826 PMCID: PMC7138948 DOI: 10.1002/rmb2.12323] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/20/2020] [Accepted: 02/25/2020] [Indexed: 12/18/2022] Open
Abstract
PURPOSE Resveratrol is a well-known potent activator of sirtuin-1 (SIRT1). We investigated the direct effects of hypoxia and resveratrol on SIRT1/ peroxisome proliferator-activated receptor-gamma coactivator 1α (PGC-1α) pathways, vascular endothelial growth factor (VEGF), hypoxia-inducible factor (HIF)-1α, and mitochondrial quantity in a steroidogenic human ovarian granulosa-like tumor cell line (KGN) cells. METHODS KGN cells were cultured with cobalt chloride (CoCl2; a hypoxia-mimicking agent) and/or resveratrol. The mRNA and protein levels, protein secretion, and intracellular localization were assessed by real-time PCR, Western blot analysis, ELISA, and immunofluorescence staining, respectively. Mitochondrial quantity was measured based on the mitochondrial DNA (mtDNA) copy number. RESULTS CoCl2 simultaneously attenuated the levels of SIRT1 and mtDNA expression, and induced the levels of VEGF protein production. In contrast, resveratrol significantly increased the levels of SIRT1 and mtDNA copy number, but reduced VEGF production in normoxia. Resveratrol could recover CoCl2-suppressed SIRT1 and mtDNA expression and antagonize CoCl2-induced VEGF production. CoCl2 treatment resulted in a downregulation of PGC-1α expression, and this effect was recovered by resveratrol. Resveratrol significantly suppressed the production of the CoCl2-induced HIF-1α and VEGF proteins. CONCLUSION These results suggest that resveratrol improves mitochondrial quantity by activating the SIRT1/PGC-1α pathway and inhibits VEGF induction through HIF-1α under hypoxic conditions.
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Affiliation(s)
- Akemi Nishigaki
- Department of Obstetrics and GynecologyKansai Medical UniversityOsakaJapan
| | - Takeharu Kido
- Department of Obstetrics and GynecologyKansai Medical UniversityOsakaJapan
| | - Naoko Kida
- Department of Obstetrics and GynecologyKansai Medical UniversityOsakaJapan
| | | | - Hiroaki Tsubokura
- Department of Obstetrics and GynecologyKansai Medical UniversityOsakaJapan
| | - Yoji Hisamatsu
- Department of Obstetrics and GynecologyKansai Medical UniversityOsakaJapan
| | - Hidetaka Okada
- Department of Obstetrics and GynecologyKansai Medical UniversityOsakaJapan
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27
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McCrimmon A, Domondon M, Sultanova RF, Ilatovskaya DV, Stadler K. Comprehensive assessment of mitochondrial respiratory function in freshly isolated nephron segments. Am J Physiol Renal Physiol 2020; 318:F1237-F1245. [PMID: 32223308 DOI: 10.1152/ajprenal.00031.2020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Changes in mitochondrial function are central to many forms of kidney disease, including acute injury, diabetic nephropathy, hypertension, and chronic kidney diseases. As such, there is an increasing need for reliable and fast methods for assessing mitochondrial respiratory function in renal cells. Despite being indispensable for many mechanistic studies, cultured cells or isolated mitochondria, however, often do not recapitulate in vivo or close to in vivo situations. Cultured and/or immortalized cells often change their bioenergetic profile and phenotype compared with in vivo or ex vivo situations, and isolated mitochondria are simply removed from their cellular milieu. This is especially important for extremely complex organs such as the kidney. Here, we report the development and validation of a new approach for the rapid assessment of mitochondrial oxygen consumption on freshly isolated glomeruli or proximal tubular fragments using Agilent SeaHorse XFe24 and XF96 Extracellular Flux Analyzers. We validated the technique in several healthy and diseased rodent models: the C57BL/6J mouse, the diabetic db/db mouse and matching db/+ control mouse, and the Dahl salt-sensitive rat. We compared the data to respiration from isolated mitochondria. The method can be adapted and used for the rapid assessment of mitochondrial oxygen consumption from any rodent model of the investigator's choice. The isolation methods presented here ensure viable and functional proximal tubular fragments and glomeruli, with a preserved cellular environment for studying mitochondrial function within the context of their surroundings and interactions.
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Affiliation(s)
- Allison McCrimmon
- Oxidative Stress and Disease Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana
| | - Mark Domondon
- Division of Nephrology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Regina F Sultanova
- Division of Nephrology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Daria V Ilatovskaya
- Division of Nephrology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Krisztian Stadler
- Oxidative Stress and Disease Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana
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28
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Meng H, Yan WY, Lei YH, Wan Z, Hou YY, Sun LK, Zhou JP. SIRT3 Regulation of Mitochondrial Quality Control in Neurodegenerative Diseases. Front Aging Neurosci 2019; 11:313. [PMID: 31780922 PMCID: PMC6861177 DOI: 10.3389/fnagi.2019.00313] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 10/29/2019] [Indexed: 12/21/2022] Open
Abstract
Neurodegenerative diseases are disorders that are characterized by a progressive decline of motor and/or cognitive functions caused by the selective degeneration and loss of neurons within the central nervous system. The most common neurodegenerative diseases are Alzheimer's disease (AD), Parkinson's disease (PD), and Huntington's disease (HD). Neurons have high energy demands, and dysregulation of mitochondrial quality and function is an important cause of neuronal degeneration. Mitochondrial quality control plays an important role in maintaining mitochondrial integrity and ensuring normal mitochondrial function; thus, defects in mitochondrial quality control are also significant causes of neurodegenerative diseases. The mitochondrial deacetylase SIRT3 has been found to have a large effect on mitochondrial function. Recent studies have also shown that SIRT3 has a role in mitochondrial quality control, including in the refolding or degradation of misfolded/unfolded proteins, mitochondrial dynamics, mitophagy, and mitochondrial biogenesis, all of which are affected in neurodegenerative diseases.
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Affiliation(s)
- Hao Meng
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
- Department of Neurosurgery, The First Hospital of Jilin University, Changchun, China
| | - Wan-Yu Yan
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Yu-Hong Lei
- Department of Neurosurgery, The First Hospital of Jilin University, Changchun, China
| | - Zheng Wan
- Department of Neurosurgery, The First Hospital of Jilin University, Changchun, China
| | - Ye-Ye Hou
- Department of Neurosurgery, The First Hospital of Jilin University, Changchun, China
| | - Lian-Kun Sun
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, China
| | - Jue-Pu Zhou
- Department of Neurosurgery, The First Hospital of Jilin University, Changchun, China
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29
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Wang B, Gao X, Liu B, Li Y, Bai M, Zhang Z, Xu E, Xiong Z, Hu Y. Protective effects of curcumin against chronic alcohol-induced liver injury in mice through modulating mitochondrial dysfunction and inhibiting endoplasmic reticulum stress. Food Nutr Res 2019; 63:3567. [PMID: 31762728 PMCID: PMC6852329 DOI: 10.29219/fnr.v63.3567] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 08/25/2019] [Accepted: 08/26/2019] [Indexed: 12/12/2022] Open
Abstract
Background Curcumin is a major active ingredient extracted from powdered dry rhizome of Curcuma longa. In Ayurveda and traditional Chinese medicine, it has been used as a hepatoprotective agent for centuries. However, the underlying mechanisms are not clear. Objective The present study is to investigate the hepatoprotective effects of curcumin in chronic alcohol-induced liver injury and explore its mechanism. Design Alcohol-exposed Balb/c mice were treated with curcumin (75 and 150 mg/kg) once per day for 8 weeks. Tissue from individual was fixed with formaldehyde for pathological examination. The activities of mitochondrial antioxidant enzymes, Na+/k+-ATPase, Ca2+-ATPase, and Ca2+Mg2+-ATPase, were determined. The level of mitochondrial membrane potential (MMP) and mitochondrial permeability transition pore (MPTP) opening was also determined. The expression of PGC-1α, NRF1, Mn-SOD, GRP78, PERK, IRE1α, nuclear NF-κB, and phosphorylated IκBα was quantified by western blot. The contents of TNF-α, IL-1β, and IL-6 in the liver were measured using the ELISA method. Results Curcumin significantly promoted hepatic mitochondrial function by reducing the opening of MPTP, thus increasing the MMP, promoting the activity of Na+/k+-ATPase, Ca2+-ATPase, and Ca2+/Mg2+-ATPase, and attenuating oxidative stress. Curcumin upregulated the expression of PGC-1α, NRF1, and Mn-SOD, and downregulated the expression of GRP78, PERK, and IRE1α in hepatic tissue. Curcumin also attenuated inflammation by inhibiting the IκBα–NF-κB pathway, which reduced the production of TNF, IL-1β, and IL-6. Conclusion Curcumin attenuates alcohol-induced liver injury via improving mitochondrial function and attenuating endoplasmic reticulum stress and inflammation. This study provides strong evidence for the beneficial effects of curcumin in the treatment of chronic alcohol-induced liver injury.
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Affiliation(s)
- Baoying Wang
- Key Laboratory for Modern Research on Zhongjing's Herbal Formulae of Henan Province, Scientific Research and Experiment Center, Henan University of Chinese Medicine, Zhengzhou, China
| | - Xiaolin Gao
- Basic Medical School, Henan University of Chinese Medicine, Zhengzhou, China
| | - Baoguang Liu
- Key Laboratory for Modern Research on Zhongjing's Herbal Formulae of Henan Province, Scientific Research and Experiment Center, Henan University of Chinese Medicine, Zhengzhou, China
| | - Yucheng Li
- Key Laboratory for Modern Research on Zhongjing's Herbal Formulae of Henan Province, Scientific Research and Experiment Center, Henan University of Chinese Medicine, Zhengzhou, China
| | - Ming Bai
- Key Laboratory for Modern Research on Zhongjing's Herbal Formulae of Henan Province, Scientific Research and Experiment Center, Henan University of Chinese Medicine, Zhengzhou, China
| | - Zhenqiang Zhang
- Key Laboratory for Modern Research on Zhongjing's Herbal Formulae of Henan Province, Scientific Research and Experiment Center, Henan University of Chinese Medicine, Zhengzhou, China
| | - Erping Xu
- Key Laboratory for Modern Research on Zhongjing's Herbal Formulae of Henan Province, Scientific Research and Experiment Center, Henan University of Chinese Medicine, Zhengzhou, China
| | - Zhang'e Xiong
- Department of Gastroenterology and Key Laboratory for Molecular Diagnosis of Hubei, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Department of Gastroenterology, Hubei Hospital of Traditional Chinese Medicine, Wuhan, China
| | - Yunlian Hu
- Department of Gastroenterology, Hubei Hospital of Traditional Chinese Medicine, Wuhan, China
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30
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Lee G, Uddin MJ, Kim Y, Ko M, Yu I, Ha H. PGC-1α, a potential therapeutic target against kidney aging. Aging Cell 2019; 18:e12994. [PMID: 31313501 PMCID: PMC6718532 DOI: 10.1111/acel.12994] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 05/27/2019] [Accepted: 05/29/2019] [Indexed: 12/12/2022] Open
Abstract
Aging is defined as changes in an organism over time. The proportion of the aged population is markedly increasing worldwide. The kidney, as an essential organ with a high energy requirement, is one of the most susceptible organs to aging. It is involved in glucose metabolism via gluconeogenesis, glucose filtration and reabsorption, and glucose utilization. Proximal tubular epithelial cells (PTECs) depend on lipid metabolism to meet the high demand for ATP. Recent studies have shown that aging‐related kidney dysfunction is highly associated with metabolic changes in the kidney. Peroxisome proliferator‐activated receptor gamma coactivator‐1 alpha (PGC‐1α), a transcriptional coactivator, plays a major role in the regulation of mitochondrial biogenesis, peroxisomal biogenesis, and glucose and lipid metabolism. PGC‐1α is abundant in tissues, including kidney PTECs, which demand high energy. Many in vitro and in vivo studies have demonstrated that the activation of PGC‐1α by genetic or pharmacological intervention prevents telomere shortening and aging‐related changes in the skeletal muscle, heart, and brain. The activation of PGC‐1α can also prevent kidney dysfunction in various kidney diseases. Therefore, a better understanding of the effect of PGC‐1α activation in various organs on aging and kidney diseases may unveil a potential therapeutic strategy against kidney aging.
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Affiliation(s)
- Gayoung Lee
- Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
- College of Pharmacy Ewha Womans University Seoul Korea
| | - Md Jamal Uddin
- Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
- College of Pharmacy Ewha Womans University Seoul Korea
| | - Yoojeong Kim
- College of Pharmacy Ewha Womans University Seoul Korea
| | - Minji Ko
- College of Pharmacy Ewha Womans University Seoul Korea
| | - Inyoung Yu
- College of Pharmacy Ewha Womans University Seoul Korea
| | - Hunjoo Ha
- Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
- College of Pharmacy Ewha Womans University Seoul Korea
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31
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Jiang M, Fan J, Qu X, Li S, Nilsson SK, Sun YBY, Chen Y, Yu D, Liu D, Liu BC, Tang M, Chen W, Ren Y, Nikolic-Paterson DJ, Jiang X, Li J, Yu X. Combined Blockade of Smad3 and JNK Pathways Ameliorates Progressive Fibrosis in Folic Acid Nephropathy. Front Pharmacol 2019; 10:880. [PMID: 31447676 PMCID: PMC6695473 DOI: 10.3389/fphar.2019.00880] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 07/10/2019] [Indexed: 12/12/2022] Open
Abstract
Acute kidney injury leading to chronic kidney disease through tubulointerstitial fibrosis is a major challenge in nephropathy. Several signaling pathways promote interstitial fibrosis; however, effective suppression of fibrosis may require blockade of more than one pathway. This study investigated whether blockade of Smad3 and c-Jun N-terminal kinase (JNK) signaling gives added suppression of interstitial fibrosis in folic acid nephropathy. A single high dose of folic acid (FA) causes acute tubular damage in C57BL/6J mice followed by interstitial fibrosis and chronic renal impairment. Co-activations of Smad3 and JNK signaling occur in both tubular epithelial cells and myofibroblasts in areas of tubulointerstitial damage and fibrosis in both murine FA-induced nephropathy and human IgA nephropathy. Groups of mice were treated with a Smad3 inhibitor (SIS3), a JNK inhibitor (SP600125), or a combination from day 6 after FA administration until being killed on day 28. Each drug efficiently inhibited its specific target (Smad3 phosphorylation or c–Jun phosphorylation) without affecting the other pathway. Given alone, each drug partially reduced renal fibrosis, whereas the combination therapy gave an additive and profound protection from renal fibrosis and improved renal function. Inhibition of Smad3 and/or JNK signaling activities prevented down-regulation of PGC-1α in tubular epithelial cells and up-regulation of PGC-1α in myofibroblasts during FA-induced renal fibrosis and inflammation. The expression of PGC-1α was upregulated in Smad3−/− NRK52E cells while downregulated in Smad3−/−NRK49F cells, suggesting that Smad3 signaling may regulate expression of PGC-1α in renal tubular epithelial cells and fibroblasts in distinct fashion. In vivo and cell culture studies also indicate that Smad3 and JNK signaling cooperate to cause mitochondrial dysfunction and cell damage in tubular epithelial cells via direct actions on the transcription of PGC-1α. These pathways also act cooperatively to promote renal fibroblast proliferation in tempo-spatial fashion. In conclusion, we have identified a potential combination therapy for progressive renal fibrosis which operates, in part, through modifying mitochondrial function.
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Affiliation(s)
- Mengjie Jiang
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Jinjin Fan
- Department of Nephrology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Key Laboratory of Nephrology, National Health Commission and Guangdong Province, Guangzhou, China
| | - Xinli Qu
- Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Songhui Li
- Biomedical Manufacturing Commonwealth Scientific and Industrial Research Organisation (CSIRO), Melbourne, VIC, Australia.,Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Susan K Nilsson
- Biomedical Manufacturing Commonwealth Scientific and Industrial Research Organisation (CSIRO), Melbourne, VIC, Australia.,Australian Regenerative Medicine Institute, Monash University, Clayton, VIC, Australia
| | - Yu Bo Yang Sun
- Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Yaping Chen
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia
| | - Di Yu
- Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia
| | - Dan Liu
- Institute of Nephrology, Zhong Da Hospital, Southeast University, Nanjing, China
| | - Bi-Cheng Liu
- Institute of Nephrology, Zhong Da Hospital, Southeast University, Nanjing, China
| | - Mingliang Tang
- Key Laboratory for Developmental Genes and Human Disease, Ministry of Education, Institute of Life Sciences, Southeast University, Nanjing, China
| | - Wei Chen
- Department of Nephrology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Key Laboratory of Nephrology, National Health Commission and Guangdong Province, Guangzhou, China
| | - Yi Ren
- Florida State University College of Medicine, Tallahassee, FL, United States
| | - David J Nikolic-Paterson
- Department of Nephrology, Monash Health and Monash University Department of Medicine, Clayton, VIC, Australia
| | - Xiaoyun Jiang
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Jinhua Li
- Department of Anatomy and Developmental Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia.,Key Laboratory of Nephrology, National Health Commission and Guangdong Province, Guangzhou, China.,The Second Clinical College and Shunde Women and Children Hospital, Guangdong Medical University, Shunde, China
| | - Xueqing Yu
- Key Laboratory of Nephrology, National Health Commission and Guangdong Province, Guangzhou, China.,The Second Clinical College and Shunde Women and Children Hospital, Guangdong Medical University, Shunde, China.,Guangdong Academy of Medical Science, Guangdong Provincial People's Hospital, Guangzhou, China
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32
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Salt Inducible Kinase Signaling Networks: Implications for Acute Kidney Injury and Therapeutic Potential. Int J Mol Sci 2019; 20:ijms20133219. [PMID: 31262033 PMCID: PMC6651122 DOI: 10.3390/ijms20133219] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 06/26/2019] [Accepted: 06/27/2019] [Indexed: 02/06/2023] Open
Abstract
A number of signal transduction pathways are activated during Acute Kidney Injury (AKI). Of particular interest is the Salt Inducible Kinase (SIK) signaling network, and its effects on the Renal Proximal Tubule (RPT), one of the primary targets of injury in AKI. The SIK1 network is activated in the RPT following an increase in intracellular Na+ (Na+in), resulting in an increase in Na,K-ATPase activity, in addition to the phosphorylation of Class IIa Histone Deacetylases (HDACs). In addition, activated SIKs repress transcriptional regulation mediated by the interaction between cAMP Regulatory Element Binding Protein (CREB) and CREB Regulated Transcriptional Coactivators (CRTCs). Through their transcriptional effects, members of the SIK family regulate a number of metabolic processes, including such cellular processes regulated during AKI as fatty acid metabolism and mitochondrial biogenesis. SIKs are involved in regulating a number of other cellular events which occur during AKI, including apoptosis, the Epithelial to Mesenchymal Transition (EMT), and cell division. Recently, the different SIK kinase isoforms have emerged as promising drug targets, more than 20 new SIK2 inhibitors and activators having been identified by MALDI-TOF screening assays. Their implementation in the future should prove to be important in such renal disease states as AKI.
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Duan J, Cui J, Zheng H, Xi M, Guo C, Weng Y, Yin Y, Wei G, Cao J, Wang Y, Wen A, Qiao B. Aralia taibaiensis Protects against I/R-Induced Brain Cell Injury through the Akt/SIRT1/FOXO3a Pathway. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:7609765. [PMID: 31214282 PMCID: PMC6535894 DOI: 10.1155/2019/7609765] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Accepted: 02/27/2019] [Indexed: 11/23/2022]
Abstract
BACKGROUND Saponin from Aralia taibaiensis (sAT) showed excellent antioxidative effects in several models; however, its effects on brain cells were unknown to us. The present study was designed to evaluate the protective effects of sAT on ischemia/reperfusion- (I/R-) induced injury and clarify its mechanisms. METHODS In vitro, HT22 cells were pretreated with sAT and then subjected to I/R. Apoptosis rate, mitochondrial function, and antioxidant proteins were measured. To clarify the mechanisms, siRNA were used. In vivo, sAT was pretreated through intragastric administration for 7 days and the I/R model was induced. The neurobehavioral scores, infarction volumes, and some cytokines in the brain were measured. Protein levels were investigated by Western blotting. RESULTS The results showed that sAT treatment significantly protected cells from I/R-induced cell apoptosis and mitochondrial dysfunction. The antioxidant protein levels were increased in a dose-dependent manner. Further study revealed that sAT induced the deacetylation and phosphorylation of PGC-1α and FOXO3a. sAT treatment also induced the phosphorylation levels of Akt and the expression levels of SIRT1. Using the specific targeted siRNA transfection, the interplay relationship between Akt, SIRT1, PGC-1α, and FOXO3a was verified. Furthermore, the same protective effects were also observed in rats subjected to I/R. CONCLUSION sAT protected brain cells from I/R-induced mitochondrial oxidative stress and dysfunction through regulating the Akt/SIRT1/FOXO3a/PGC-1α pathway.
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Affiliation(s)
- Jialin Duan
- Biomedicine Key Laboratory of Shaanxi Province, College of Life Science, Northwest University, Xi'an 710069, China
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Jia Cui
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Hongnan Zheng
- Department of Natural Medicine, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
| | - Miaomiao Xi
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Chao Guo
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Yan Weng
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Ying Yin
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Guo Wei
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Jinyi Cao
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Yanhua Wang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Aidong Wen
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Boling Qiao
- Biomedicine Key Laboratory of Shaanxi Province, College of Life Science, Northwest University, Xi'an 710069, China
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Protection of Myocardial Ischemia-Reperfusion by Therapeutic Hypercapnia: a Mechanism Involving Improvements in Mitochondrial Biogenesis and Function. J Cardiovasc Transl Res 2019; 12:467-477. [PMID: 30980235 DOI: 10.1007/s12265-019-09886-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Accepted: 03/26/2019] [Indexed: 12/14/2022]
Abstract
Previous studies proposed that acidic reperfusion may be a protective strategy for myocardial ischemia-reperfusion therapy with potential of clinical transformation. In this study, we investigated whether therapeutic hypercapnia could mimic acidosis postconditioning in isolated hearts with a 30-min left coronary artery ligation-reperfusion model in rats. Therapeutic hypercapnia (inhalation 20% CO2 for 10 min) is cardioprotective with a strict therapeutic time window and acidity: it reduced the infarct ratio and serum myocardial enzyme and increased the myocardial ATP content. Furthermore, mitochondrial morphology damage, the loss of mitochondrial membrane potential, and the formation of mitochondrial permeability transition pore were effectively inhibited, indicating the improvements in mitochondrial function. The expression of the mitochondrial biogenesis regulators was upregulated simultaneously. These findings indicated therapeutic hypercapnia in animals can mimic ex vivo acidosis postconditioning to alleviate myocardial ischemia-reperfusion injury. The effect is related to improvement in mitochondrial function and regulation of the mitochondrial biogenesis pathway.
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Gibbs WS, Garrett SM, Beeson CC, Schnellmann RG. Identification of dual mechanisms mediating 5-hydroxytryptamine receptor 1F-induced mitochondrial biogenesis. Am J Physiol Renal Physiol 2018; 314:F260-F268. [PMID: 29046298 PMCID: PMC5866450 DOI: 10.1152/ajprenal.00324.2017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 10/17/2017] [Accepted: 10/17/2017] [Indexed: 02/07/2023] Open
Abstract
Our laboratory recently made the novel observation that 5-hydroxytryptamine 1F (5-HT1F) receptor activation induces mitochondrial biogenesis (MB), the production of new, functional mitochondria, in vitro and in vivo. We sought to determine the mechanism linking the 5-HT1F receptor to MB in renal proximal tubule cells. Using LY344864 , a selective 5-HT1F receptor agonist, we determined that the 5-HT1F receptor is coupled to Gαi/o and induces MB through Gβγ-dependent activation of Akt, endothelial nitric oxide synthase (eNOS), cyclic guanosine-monophosphate (cGMP), protein kinase G (PKG), and peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α). We also report that the 5-HT1F receptor signals through a second, Gβγ-dependent pathway that is linked by Akt phosphorylation of Raf. In contrast to the activated Akt pathway, Raf phosphorylation reduced extracellular signal regulated kinases (ERK1/2) and foxhead box O3a (FOXO3a) phosphorylation, suppressing an inhibitory MB pathway. These results demonstrate that the 5-HT1F receptor regulates MB through Gβγ-dependent dual mechanisms that activate a stimulatory MB pathway, Akt/eNOS/cGMP/PKG/PGC-1α, while simultaneously repressing an inhibitory MB pathway, Raf/MEK/ERK/FOXO3a. Novel mechanisms of MB provide the foundation for new chemicals that induce MB to treat acute and chronic organ injuries.
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Affiliation(s)
- Whitney S Gibbs
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , Charleston, South Carolina
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona , Tucson, Arizona
| | - Sara M Garrett
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , Charleston, South Carolina
- Division of Rheumatology and Immunology, Department of Medicine, Medical University of South Carolina , Charleston, South Carolina
| | - Craig C Beeson
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina , Charleston, South Carolina
| | - Rick G Schnellmann
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona , Tucson, Arizona
- Southern Arizona Veterans Affairs Health Care System, Tucson, Arizona
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Kolb AL, Corridon PR, Zhang S, Xu W, Witzmann FA, Collett JA, Rhodes GJ, Winfree S, Bready D, Pfeffenberger ZJ, Pomerantz JM, Hato T, Nagami GT, Molitoris BA, Basile DP, Atkinson SJ, Bacallao RL. Exogenous Gene Transmission of Isocitrate Dehydrogenase 2 Mimics Ischemic Preconditioning Protection. J Am Soc Nephrol 2018; 29:1154-1164. [PMID: 29371417 DOI: 10.1681/asn.2017060675] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 12/11/2017] [Indexed: 01/20/2023] Open
Abstract
Ischemic preconditioning confers organ-wide protection against subsequent ischemic stress. A substantial body of evidence underscores the importance of mitochondria adaptation as a critical component of cell protection from ischemia. To identify changes in mitochondria protein expression in response to ischemic preconditioning, we isolated mitochondria from ischemic preconditioned kidneys and sham-treated kidneys as a basis for comparison. The proteomic screen identified highly upregulated proteins, including NADP+-dependent isocitrate dehydrogenase 2 (IDH2), and we confirmed the ability of this protein to confer cellular protection from injury in murine S3 proximal tubule cells subjected to hypoxia. To further evaluate the role of IDH2 in cell protection, we performed detailed analysis of the effects of Idh2 gene delivery on kidney susceptibility to ischemia-reperfusion injury. Gene delivery of IDH2 before injury attenuated the injury-induced rise in serum creatinine (P<0.05) observed in controls and increased the mitochondria membrane potential (P<0.05), maximal respiratory capacity (P<0.05), and intracellular ATP levels (P<0.05) above those in controls. This communication shows that gene delivery of Idh2 can confer organ-wide protection against subsequent ischemia-reperfusion injury and mimics ischemic preconditioning.
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Affiliation(s)
- Alexander L Kolb
- Department of Biology, Indiana University-Purdue University, Indianapolis, Indianapolis, Indiana.,Research Division, Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
| | | | - Shijun Zhang
- Department of Biology, Indiana University-Purdue University, Indianapolis, Indianapolis, Indiana
| | | | | | | | | | - Seth Winfree
- Division of Nephrology.,Indiana Center for Biological Microscopy, Indiana University School of Medicine, Indianapolis, Indiana
| | - Devin Bready
- Department of Biology, Indiana University-Purdue University, Indianapolis, Indianapolis, Indiana.,Division of Nephrology
| | | | | | | | - Glenn T Nagami
- Division of Nephrology, Department of Medicine, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California; and.,Department of Medicine, David Geffen School of Medicine at the University of California, Los Angeles Veterans Affairs Medical Center, Los Angeles, California
| | - Bruce A Molitoris
- Division of Nephrology.,Indiana Center for Biological Microscopy, Indiana University School of Medicine, Indianapolis, Indiana
| | | | - Simon J Atkinson
- Department of Biology, Indiana University-Purdue University, Indianapolis, Indianapolis, Indiana.,Division of Nephrology
| | - Robert L Bacallao
- Research Division, Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana; .,Division of Nephrology
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Abstract
PURPOSE OF REVIEW Mitochondria are complex intracellular organelles with a variety of important functions. The kidney tubule is densely packed with mitochondria, and mitochondrial dysfunction is thought to be central to the pathogenesis of acute kidney injury (AKI). Mitochondria therefore represent potential targets for novel therapeutic interventions in AKI. RECENT FINDINGS Several mitochondrial targeted approaches have shown promise in recent preclinical studies of AKI, including measures to: reduce oxidative stress within mitochondria; prevent mitochondrial fission and activation of cell death pathways; enhance recycling of damaged mitochondria via autophagy and mitophagy; and accelerate mitochondrial biogenesis postinsult. SUMMARY Recent studies show that it is now eminently feasible to pharmacologically manipulate various key aspects of mitochondrial biology in the kidney, and this has much potential for the future treatment of AKI. However, significant hurdles will have to be overcome in the translational pathway for these strategies to successfully migrate to the clinic.
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Drury ER, Zsengeller ZK, Stillman IE, Khankin EV, Pavlakis M, Parikh SM. Renal PGC1α May Be Associated with Recovery after Delayed Graft Function. Nephron Clin Pract 2017; 138:303-309. [PMID: 29268263 DOI: 10.1159/000485663] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 11/24/2017] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Delayed renal graft function (DGF) contributes to the determination of length of hospitalization, risk of acute rejection, and graft loss. Existing tools aid the diagnosis of specific DGF etiologies such as antibody-mediated rejection, but markers of recovery have been elusive. The peroxisome proliferator gamma co-activator-1-alpha (PGC1α) is highly expressed in the renal tubule, regulates mitochondrial biogenesis, and promotes recovery from experimental acute kidney injury. OBJECTIVES We aimed to determine the association between renal allograft PGC1α expression and recovery from delayed graft function. METHODS We retrospectively analyzed patients undergoing renal transplantation at a single center from January 1, 2008 to June 30, 2014. PGC1α expression was assessed by immunostaining and ultrastructural characteristics by transmission electron microscopy. Of 34 patients who underwent renal biopsy for DGF within 30 days of transplant, 21 were included for analysis. RESULTS Low PGC1α expression was associated with a significantly longer time on dialysis after transplant (median of 35.5 vs. 16 days, p < 0.05) and a significantly higher serum creatinine (sCr) at 4 weeks after transplantation among those who discontinued dialysis (5 vs. 1.65 mg/dL, p < 0.0001). Low PGC1α expression was not associated with higher sCr at 12 weeks after transplantation. Ultrastructural characteristics including apical membrane blebbing and necrotic luminal debris were not informative regarding clinical outcomes. CONCLUSIONS These data suggest that higher PGC1α expression is associated with faster and more complete recovery from DGF. Mitochondrial biogenesis may be a therapeutic target for DGF. Larger studies are needed to validate these findings.
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Affiliation(s)
- Erika R Drury
- Division of Nephrology, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Zsuzsanna K Zsengeller
- Division of Nephrology, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Isaac E Stillman
- Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Eliyahu V Khankin
- Division of Nephrology, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA.,The Transplant Institute, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Martha Pavlakis
- Division of Nephrology, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA.,The Transplant Institute, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
| | - Samir M Parikh
- Division of Nephrology, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, USA
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39
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Du K, Ramachandran A, McGill MR, Mansouri A, Asselah T, Farhood A, Woolbright BL, Ding WX, Jaeschke H. Induction of mitochondrial biogenesis protects against acetaminophen hepatotoxicity. Food Chem Toxicol 2017; 108:339-350. [PMID: 28827156 DOI: 10.1016/j.fct.2017.08.020] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 08/15/2017] [Accepted: 08/16/2017] [Indexed: 12/27/2022]
Abstract
Mitochondrial biogenesis (MB) is an adaptive response to maintain metabolic homeostasis after mitochondrial dysfunction. Induction of MB during APAP hepatotoxicity has not been studied. To investigate this, mice were treated with toxic doses of APAP and euthanized between 0 and 96 h. At early time points, APAP caused both mitochondrial dysfunction and reduction of mitochondrial mass, indicated by reduced activity of electron transport chain (ETC) complexes I and IV and depletion of mitochondrial DNA (mtDNA), respectively. Both ETC activity and mtDNA gradually recovered after 12 h, suggesting that MB occurs at late time points after APAP overdose. Immunofluorescent staining of mitochondria with mitochondrial outer membrane protein Tom20 further demonstrated that MB occurs selectively in hepatocytes surrounding necrotic areas. MB signaling mediators including PPARγ co-activator 1-α (Pgc-1α), nuclear respiratory factor-1 (Nrf-1) and mitochondrial fission protein dynamin-related protein-1 (Drp-1) were induced. Pgc-1α was selectively increased in hepatocytes surrounding necrotic areas. In addition, the time course of MB induction coincides with increased liver regeneration. Post-treatment with the known MB inducer SRT1720 increased Pgc-1α expression and liver regeneration, resulting in protection against late liver injury after APAP overdose. Thus, induction of MB is an important feature during APAP hepatotoxicity and liver regeneration.
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Affiliation(s)
- Kuo Du
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, KS, USA.
| | - Anup Ramachandran
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, KS, USA.
| | - Mitchell R McGill
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, KS, USA.
| | - Abdellah Mansouri
- Hepatology Department, Beaujon Hospital, AP-HP, Clichy, France; INSERM U1149, Centre de Recherche sur l'Inflammation, Université Denis Diderot, PRES Paris Sorbonne Cité, Paris, France.
| | - Tarik Asselah
- Hepatology Department, Beaujon Hospital, AP-HP, Clichy, France; INSERM U1149, Centre de Recherche sur l'Inflammation, Université Denis Diderot, PRES Paris Sorbonne Cité, Paris, France.
| | - Anwar Farhood
- Department of Pathology, St. David's North Austin Medical Center, Austin, TX, USA.
| | - Benjamin L Woolbright
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, KS, USA.
| | - Wen-Xing Ding
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, KS, USA.
| | - Hartmut Jaeschke
- Department of Pharmacology, Toxicology & Therapeutics, University of Kansas Medical Center, Kansas City, KS, USA.
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40
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Abstract
The kidney requires a large number of mitochondria to remove waste from the blood and regulate fluid and electrolyte balance. Mitochondria provide the energy to drive these important functions and can adapt to different metabolic conditions through a number of signalling pathways (for example, mechanistic target of rapamycin (mTOR) and AMP-activated protein kinase (AMPK) pathways) that activate the transcriptional co-activator peroxisome proliferator-activated receptor-γ co-activator 1α (PGC1α), and by balancing mitochondrial dynamics and energetics to maintain mitochondrial homeostasis. Mitochondrial dysfunction leads to a decrease in ATP production, alterations in cellular functions and structure, and the loss of renal function. Persistent mitochondrial dysfunction has a role in the early stages and progression of renal diseases, such as acute kidney injury (AKI) and diabetic nephropathy, as it disrupts mitochondrial homeostasis and thus normal kidney function. Improving mitochondrial homeostasis and function has the potential to restore renal function, and administering compounds that stimulate mitochondrial biogenesis can restore mitochondrial and renal function in mouse models of AKI and diabetes mellitus. Furthermore, inhibiting the fission protein dynamin 1-like protein (DRP1) might ameliorate ischaemic renal injury by blocking mitochondrial fission.
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41
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Han SH, Wu MY, Nam BY, Park JT, Yoo TH, Kang SW, Park J, Chinga F, Li SY, Susztak K. PGC-1 α Protects from Notch-Induced Kidney Fibrosis Development. J Am Soc Nephrol 2017; 28:3312-3322. [PMID: 28751525 DOI: 10.1681/asn.2017020130] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 06/06/2017] [Indexed: 12/14/2022] Open
Abstract
Kidney fibrosis is the histologic manifestation of CKD. Sustained activation of developmental pathways, such as Notch, in tubule epithelial cells has been shown to have a key role in fibrosis development. The molecular mechanism of Notch-induced fibrosis, however, remains poorly understood. Here, we show that, that expression of peroxisomal proliferation g-coactivator (PGC-1α) and fatty acid oxidation-related genes are lower in mice expressing active Notch1 in tubular epithelial cells (Pax8-rtTA/ICN1) compared to littermate controls. Chromatin immunoprecipitation assays revealed that the Notch target gene Hes1 directly binds to the regulatory region of PGC-1α Compared with Pax8-rtTA/ICN1 transgenic animals, Pax8-rtTA/ICN1/Ppargc1a transgenic mice showed improvement of renal structural alterations (on histology) and molecular defect (expression of profibrotic genes). Overexpression of PGC-1α restored mitochondrial content and reversed the fatty acid oxidation defect induced by Notch overexpression in vitro in tubule cells. Furthermore, compared with Pax8-rtTA/ICN1 mice, Pax8-rtTA/ICN1/Ppargc1a mice exhibited improvement in renal fatty acid oxidation gene expression and apoptosis. Our results show that metabolic dysregulation has a key role in kidney fibrosis induced by sustained activation of the Notch developmental pathway and can be ameliorated by PGC-1α.
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Affiliation(s)
- Seung Hyeok Han
- Department of Internal Medicine, Institute of Kidney Disease Research, Yonsei University College of Medicine, Seoul, Korea.,Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Mei-Yan Wu
- Severance Biomedical Science Institute, Brain Korea 21 PLUS, Yonsei University College of Medicine, Seoul, Korea; and.,Department of Nephrology, The First Hospital of Jilin University, Changchun, China
| | - Bo Young Nam
- Severance Biomedical Science Institute, Brain Korea 21 PLUS, Yonsei University College of Medicine, Seoul, Korea; and
| | - Jung Tak Park
- Department of Internal Medicine, Institute of Kidney Disease Research, Yonsei University College of Medicine, Seoul, Korea
| | - Tae-Hyun Yoo
- Department of Internal Medicine, Institute of Kidney Disease Research, Yonsei University College of Medicine, Seoul, Korea
| | - Shin-Wook Kang
- Department of Internal Medicine, Institute of Kidney Disease Research, Yonsei University College of Medicine, Seoul, Korea.,Severance Biomedical Science Institute, Brain Korea 21 PLUS, Yonsei University College of Medicine, Seoul, Korea; and
| | - Jihwan Park
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Frank Chinga
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Szu-Yuan Li
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Katalin Susztak
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;
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42
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Chan SSL. Inherited mitochondrial genomic instability and chemical exposures. Toxicology 2017; 391:75-83. [PMID: 28756246 DOI: 10.1016/j.tox.2017.07.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 06/12/2017] [Accepted: 07/24/2017] [Indexed: 12/21/2022]
Abstract
There are approximately 1500 proteins that are needed for mitochondrial structure and function, most of which are encoded in the nuclear genome (Calvo et al., 2006). Each mitochondrion has its own genome (mtDNA), which in humans encodes 13 polypeptides, 22 tRNAs and 2 rRNAs required for oxidative phosphorylation. The mitochondrial genome of humans and most vertebrates is approximately 16.5kbp, double-stranded, circular, with few non-coding bases. Thus, maintaining mtDNA stability, that is, the ability of the cell to maintain adequate levels of mtDNA template for oxidative phosphorylation is essential and can be impacted by the level of mtDNA mutation currently within the cell or mitochondrion, but also from errors made during normal mtDNA replication, defects in mitochondrial quality control mechanisms, and exacerbated by exposures to exogenous and/or endogenous genotoxic agents. In this review, we expand on the origins and consequences of mtDNA instability, the current state of research regarding the mechanisms by which mtDNA instability can be overcome by cellular and chemical interventions, and the future of research and treatments for mtDNA instability.
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Affiliation(s)
- Sherine S L Chan
- Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, United States; Neuroene Therapeutics, Mt. Pleasant, SC 29464, United States.
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43
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Mehr AP, Parikh SM. PPARγ-Coactivator-1α, Nicotinamide Adenine Dinucleotide and Renal Stress Resistance. Nephron Clin Pract 2017; 137:253-255. [PMID: 28591759 PMCID: PMC5722711 DOI: 10.1159/000471895] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 03/21/2017] [Indexed: 12/21/2022] Open
Abstract
With one of the highest mitochondrial densities in the body, the kidneys consume approximately 10% of total oxygen while constituting 0.5% of body mass. Renal respiration is linear to solute extraction, linking oxidative metabolism directly to tubular function. This fundamental role of mitochondria in renal health may become an "Achilles heel" under duress. Acute kidney injury (AKI) related to each major class of stressor - inflammation, ischemia, and toxins - exhibits early and prominent mitochondrial injury. The mitochondrial biogenesis regulator, PPARγ-coactivator-1α (PGC1α), may confer tubular protection against these stressors. Recent work proposes that renal PGC1α directly increases levels of nicotinamide adenine dinucleotide (NAD+), an essential co-factor for energy metabolism that has lately been proposed as an anti-aging factor. This mini-review summarizes recent studies on AKI, PGC1α, and NAD+ that identify a direct mechanism between the regulation of metabolic health and the ability to resist renal stressors.
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Affiliation(s)
- Ali Poyan Mehr
- Division of Nephrology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA
| | - Samir M. Parikh
- Division of Nephrology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA
- Center for Vascular Biology Research, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA
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44
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Peroxisome proliferator-activated receptor-γ–coactivator 1α (PGC-1α) gene expression in chronic kidney disease patients on hemodialysis: relation to hemodialysis-related cardiovascular morbidity and mortality. Int Urol Nephrol 2017; 49:1835-1844. [DOI: 10.1007/s11255-017-1628-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 05/19/2017] [Indexed: 01/18/2023]
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45
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Raup-Konsavage WM, Gao T, Cooper TK, Morris SM, Reeves WB, Awad AS. Arginase-2 mediates renal ischemia-reperfusion injury. Am J Physiol Renal Physiol 2017; 313:F522-F534. [PMID: 28515179 PMCID: PMC5582893 DOI: 10.1152/ajprenal.00620.2016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 04/27/2017] [Accepted: 05/10/2017] [Indexed: 01/01/2023] Open
Abstract
Novel therapeutic interventions for preventing or attenuating kidney injury following ischemia-reperfusion injury (IRI) remain a focus of significant interest. Currently, there are no definitive therapeutic or preventive approaches available for ischemic acute kidney injury (AKI). Our objective is to determine 1) whether renal arginase activity or expression is increased in renal IRI, and 2) whether arginase plays a role in development of renal IRI. The impact of arginase activity and expression on renal damage was evaluated in male C57BL/6J (wild type) and arginase-2 (ARG2)-deficient (Arg2-/- ) mice subjected to bilateral renal ischemia for 28 min, followed by reperfusion for 24 h. ARG2 expression and arginase activity significantly increased following renal IRI, paralleling the increase in kidney injury. Pharmacological blockade or genetic deficiency of Arg2 conferred kidney protection in renal IRI. Arg2-/- mice had significantly attenuated kidney injury and lower plasma creatinine and blood urea nitrogen levels after renal IRI. Blocking arginases using S-(2-boronoethyl)-l-cysteine (BEC) 18 h before ischemia mimicked arginase deficiency by reducing kidney injury, histopathological changes and kidney injury marker-1 expression, renal apoptosis, kidney inflammatory cell recruitment and inflammatory cytokines, and kidney oxidative stress; increasing kidney nitric oxide (NO) production and endothelial NO synthase (eNOS) phosphorylation, kidney peroxisome proliferator-activated receptor-γ coactivator-1α expression, and mitochondrial ATP; and preserving kidney mitochondrial ultrastructure compared with vehicle-treated IRI mice. Importantly, BEC-treated eNOS-knockout mice failed to reduce blood urea nitrogen and creatinine following renal IRI. These findings indicate that ARG2 plays a major role in renal IRI, via an eNOS-dependent mechanism, and that blocking ARG2 activity or expression could be a novel therapeutic approach for prevention of AKI.
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Affiliation(s)
- Wesley M Raup-Konsavage
- Division of Nephrology, Department of Medicine, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania
| | - Ting Gao
- Division of Nephrology, Department of Medicine, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania
| | - Timothy K Cooper
- Department of Comparative Medicine, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania
| | - Sidney M Morris
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - W Brian Reeves
- Department of Medicine, University of Texas Health Science Center San Antonio, San Antonio, Texas; and
| | - Alaa S Awad
- Division of Nephrology, Department of Medicine, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania; .,Department of C&M Physiology, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania
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SIRTUIN 1 ACTIVATOR SRT1720 PROTECTS AGAINST ORGAN INJURY INDUCED BY INTESTINAL ISCHEMIA-REPERFUSION. Shock 2016; 45:359-66. [PMID: 26263437 DOI: 10.1097/shk.0000000000000448] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Intestinal ischemia-reperfusion (I/R) occurs in various clinical situations and causes local and remote organ injury, especially in the lungs, leading to significant morbidity and mortality. The maintenance of mitochondrial biogenesis is essential for cell survival and is regulated in part by sirtuin 1 (SIRT1), an energy-sensing enzyme. We hypothesized that SIRT1 activation with SRT1720 would reduce local and remote organ injury after intestinal I/R. Intestinal I/R was induced by the occlusion of the superior mesenteric artery of adult male C57BL/6 mice for 45 min, followed by reperfusion for 4 h. SRT1720 or vehicle was injected intravenously at the time of reperfusion. Blood, small intestine, and lung tissues were collected for analysis. The SRT1720 treatment of I/R mice resulted in a 57% increase in protein levels of succinate dehydrogenase, an index of mitochondrial mass, and a 120% increase in messenger RNA levels of mitochondrial transcription factor A, a marker for mitochondrial biogenesis. The microscopic architecture and apoptosis of the gut tissue was improved in the SRT1720-treated I/R mice. SRT1720 decreased intestinal messenger RNA levels of tumor necrosis factor-α by 60% and inducible nitric oxide synthase to baseline after I/R. Systemic inflammation, as determined by serum interleukin-6, was reduced in treated mice. Lung injury, as measured by histological architecture and myeloperoxidase activity, and lung apoptosis were also improved after the SRT1720 treatment. SRT1720 preserved mitochondrial biogenesis and mass, leading to inhibition of inflammation and oxidative stress, thereby protecting against intestinal I/R-induced injury. Thus, the SIRT1-mediated pathway is a promising target for the treatment of intestinal I/R injury.
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Ruiz-Andres O, Sanchez-Niño MD, Moreno JA, Ruiz-Ortega M, Ramos AM, Sanz AB, Ortiz A. Downregulation of kidney protective factors by inflammation: role of transcription factors and epigenetic mechanisms. Am J Physiol Renal Physiol 2016; 311:F1329-F1340. [PMID: 27760772 DOI: 10.1152/ajprenal.00487.2016] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 10/11/2016] [Accepted: 10/12/2016] [Indexed: 12/22/2022] Open
Abstract
Chronic kidney disease (CKD) is associated to an increased risk of death, CKD progression, and acute kidney injury (AKI) even from early stages, when glomerular filtration rate (GFR) is preserved. The link between early CKD and these risks is unclear, since there is no accumulation of uremic toxins. However, pathological albuminuria and kidney inflammation are frequent features of early CKD, and the production of kidney protective factors may be decreased. Indeed, Klotho expression is already decreased in CKD category G1 (normal GFR). Klotho has anti-aging and nephroprotective properties, and decreased Klotho levels may contribute to increase the risk of death, CKD progression, and AKI. In this review, we discuss the downregulation by mediators of inflammation of molecules with systemic and/or renal local protective functions, exemplified by Klotho and peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α), a transcription factor that promotes mitochondrial biogenesis. Cytokines such as TWEAK, TNF-α, or transforming growth factor -β1 produced locally during kidney injury or released from inflammatory sites at other organs may decrease kidney expression of Klotho and PGC-1α or lead to suboptimal recruitment of these nephroprotective proteins. Transcription factors (e.g., Smad3 and NF-κB) and epigenetic mechanisms (e.g., histone acetylation or methylation) contribute to downregulate the expression of Klotho and/or PGC-1α, while histone crotonylation promotes PGC-1α expression. NF-κBiz facilitates the repressive effect of NF-κB on Klotho expression. A detailed understanding of these mediators may contribute to the development of novel therapeutic approaches to prevent CKD progression and its negative impact on mortality and AKI.
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Affiliation(s)
- Olga Ruiz-Andres
- IIS-Fundación Jiménez Díaz, School of Medicine, Universidad Autónoma de Madrid.,REDINREN, Madrid, Spain; and
| | - Maria Dolores Sanchez-Niño
- IIS-Fundación Jiménez Díaz, School of Medicine, Universidad Autónoma de Madrid.,REDINREN, Madrid, Spain; and
| | - Juan Antonio Moreno
- IIS-Fundación Jiménez Díaz, School of Medicine, Universidad Autónoma de Madrid
| | - Marta Ruiz-Ortega
- IIS-Fundación Jiménez Díaz, School of Medicine, Universidad Autónoma de Madrid.,REDINREN, Madrid, Spain; and
| | - Adrian Mario Ramos
- IIS-Fundación Jiménez Díaz, School of Medicine, Universidad Autónoma de Madrid.,REDINREN, Madrid, Spain; and
| | - Ana Belen Sanz
- IIS-Fundación Jiménez Díaz, School of Medicine, Universidad Autónoma de Madrid.,REDINREN, Madrid, Spain; and
| | - Alberto Ortiz
- IIS-Fundación Jiménez Díaz, School of Medicine, Universidad Autónoma de Madrid; .,REDINREN, Madrid, Spain; and.,Fundación Renal Iñigo Alvarez de Toledo-IRSIN, Madrid, Spain
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Kim MJ, Koo YD, Kim M, Lim S, Park YJ, Chung SS, Jang HC, Park KS. Rg3 Improves Mitochondrial Function and the Expression of Key Genes Involved in Mitochondrial Biogenesis in C2C12 Myotubes. Diabetes Metab J 2016; 40:406-413. [PMID: 27535645 PMCID: PMC5069397 DOI: 10.4093/dmj.2016.40.5.406] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 01/04/2016] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND Panax ginseng has glucose-lowering effects, some of which are associated with the improvement in insulin resistance in skeletal muscle. Because mitochondria play a pivotal role in the insulin resistance of skeletal muscle, we investigated the effects of the ginsenoside Rg3, one of the active components of P. ginseng, on mitochondrial function and biogenesis in C2C12 myotubes. METHODS C2C12 myotubes were treated with Rg3 for 24 hours. Insulin signaling pathway proteins were examined by Western blot. Cellular adenosine triphosphate (ATP) levels and the oxygen consumption rate were measured. The protein or mRNA levels of mitochondrial complexes were evaluated by Western blot and quantitative reverse transcription polymerase chain reaction analysis. RESULTS Rg3 treatment to C2C12 cells activated the insulin signaling pathway proteins, insulin receptor substrate-1 and Akt. Rg3 increased ATP production and the oxygen consumption rate, suggesting improved mitochondrial function. Rg3 increased the expression of peroxisome proliferator-activated receptor γ coactivator 1α, nuclear respiratory factor 1, and mitochondrial transcription factor, which are transcription factors related to mitochondrial biogenesis. Subsequent increased expression of mitochondrial complex IV and V was also observed. CONCLUSION Our results suggest that Rg3 improves mitochondrial function and the expression of key genes involved in mitochondrial biogenesis, leading to an improvement in insulin resistance in skeletal muscle. Rg3 may have the potential to be developed as an anti-hyperglycemic agent.
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Affiliation(s)
- Min Joo Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
- Department of Internal Medicine, Korea Cancer Center Hospital, Seoul, Korea
| | - Young Do Koo
- Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Korea
| | - Min Kim
- Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Korea
| | - Soo Lim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Young Joo Park
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Sung Soo Chung
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
- Biomedical Research Institute and Innovative Research Institute for Cell Therapy, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Hak C Jang
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Kyong Soo Park
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
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Pedraza-Chaverri J, Sánchez-Lozada LG, Osorio-Alonso H, Tapia E, Scholze A. New Pathogenic Concepts and Therapeutic Approaches to Oxidative Stress in Chronic Kidney Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:6043601. [PMID: 27429711 PMCID: PMC4939360 DOI: 10.1155/2016/6043601] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 05/16/2016] [Accepted: 05/25/2016] [Indexed: 12/24/2022]
Abstract
In chronic kidney disease inflammatory processes and stimulation of immune cells result in overproduction of free radicals. In combination with a reduced antioxidant capacity this causes oxidative stress. This review focuses on current pathogenic concepts of oxidative stress for the decline of kidney function and development of cardiovascular complications. We discuss the impact of mitochondrial alterations and dysfunction, a pathogenic role for hyperuricemia, and disturbances of vitamin D metabolism and signal transduction. Recent antioxidant therapy options including the use of vitamin D and pharmacologic therapies for hyperuricemia are discussed. Finally, we review some new therapy options in diabetic nephropathy including antidiabetic agents (noninsulin dependent), plant antioxidants, and food components as alternative antioxidant therapies.
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Affiliation(s)
| | - Laura G. Sánchez-Lozada
- Laboratory of Renal Physiopathology, INC Ignacio Chávez, 14080 Mexico City, DF, Mexico
- Department of Nephrology, INC Ignacio Chávez, 14080 Mexico City, DF, Mexico
| | - Horacio Osorio-Alonso
- Laboratory of Renal Physiopathology, INC Ignacio Chávez, 14080 Mexico City, DF, Mexico
- Department of Nephrology, INC Ignacio Chávez, 14080 Mexico City, DF, Mexico
| | - Edilia Tapia
- Laboratory of Renal Physiopathology, INC Ignacio Chávez, 14080 Mexico City, DF, Mexico
- Department of Nephrology, INC Ignacio Chávez, 14080 Mexico City, DF, Mexico
| | - Alexandra Scholze
- Department of Nephrology, Odense University Hospital, 5000 Odense, Denmark
- Institute of Clinical Research, University of Southern Denmark, 5000 Odense, Denmark
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Emma F, Montini G, Parikh SM, Salviati L. Mitochondrial dysfunction in inherited renal disease and acute kidney injury. Nat Rev Nephrol 2016; 12:267-80. [PMID: 26804019 PMCID: PMC5469549 DOI: 10.1038/nrneph.2015.214] [Citation(s) in RCA: 247] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Mitochondria are increasingly recognized as key players in genetic and acquired renal diseases. Most mitochondrial cytopathies that cause renal symptoms are characterized by tubular defects, but glomerular, tubulointerstitial and cystic diseases have also been described. For example, defects in coenzyme Q10 (CoQ10) biosynthesis and the mitochondrial DNA 3243 A>G mutation are important causes of focal segmental glomerulosclerosis in children and in adults, respectively. Although they sometimes present with isolated renal findings, mitochondrial diseases are frequently associated with symptoms related to central nervous system and neuromuscular involvement. They can result from mutations in nuclear genes that are inherited according to classic Mendelian rules or from mutations in mitochondrial DNA, which are transmitted according to more complex rules of mitochondrial genetics. Diagnosis of mitochondrial disorders involves clinical characterization of patients in combination with biochemical and genetic analyses. In particular, prompt diagnosis of CoQ10 biosynthesis defects is imperative because of their potentially reversible nature. In acute kidney injury (AKI), mitochondrial dysfunction contributes to the physiopathology of tissue injury, whereas mitochondrial biogenesis has an important role in the recovery of renal function. Potential therapies that target mitochondrial dysfunction or promote mitochondrial regeneration are being developed to limit renal damage during AKI and promote repair of injured tissue.
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Affiliation(s)
- Francesco Emma
- Division of Nephrology and Dialysis, Ospedale Pediatrico Bambino Gesù-IRCCS, Piazza Sant'Onofrio 4, 00165 Rome, Italy
| | - Giovanni Montini
- Pediatric Nephrology and Dialysis Unit, Department of Clinical Sciences and Community Health, University of Milan, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, Via della Commenda 9, Milano, Italy
| | - Samir M Parikh
- Division of Nephrology and Center for Vascular Biology Research, Beth Israel Deaconess Medical Center and Harvard Medical School, 330 Brookline Avenue, Boston, Massachusetts 02215, USA
| | - Leonardo Salviati
- Clinical Genetics Unit, Department of Woman and Child Health, University of Padova, Via Giustiniani 3, 35128, Padova, Italy
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