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Zhang C, Zhang Y, Liu D, Mei M, Song N, Zhuang Q, Jiang Y, Guo Y, Liu G, Li X, Ren L. Dexmedetomidine mitigates acute kidney injury after coronary artery bypass grafting: a prospective clinical trial. REVISTA ESPANOLA DE CARDIOLOGIA (ENGLISH ED.) 2024; 77:645-655. [PMID: 38423177 DOI: 10.1016/j.rec.2024.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 02/12/2024] [Indexed: 03/02/2024]
Abstract
INTRODUCTION AND OBJECTIVES To evaluate the impact of dexmedetomidine impact on cardiac surgery-associated acute kidney injury (CSA-AKI), kidney function, and metabolic and oxidative stress in patients undergoing coronary artery bypass grafting with heart-lung machine support. METHODS A randomized double-masked trial with 238 participants (50-75 years) undergoing coronary artery bypass grafting was conducted from January 2021 to December 2022. The participants were divided into Dex (n=119) and NS (n = 119) groups. Dex was administered at 0.5 mcg/kg over 10minutes, then 0.4 mcg/kg/h until the end of surgery; the NS group received equivalent saline. Blood and urine were sampled at various time points pre- and postsurgery. The primary outcome measure was the incidence of CSA-AKI, defined as the occurrence of AKI within 96hours after surgery. RESULTS The incidence of CSA-AKI was significantly lower in the Dex group than in the NS group (18.26% vs 32.46%; P=.014). Substantial increases were found in estimated glomerular filtration rate value at T4-T6 (P<.05) and urine volume 24hours after surgery (P<.01). Marked decreases were found in serum creatinine level, blood glucose level at T1-T2 (P<.01), blood urea nitrogen level at T3-T6 (P<.01), free fatty acid level at T2-T3 (P<.01), and lactate level at T3-T4 (P<.01). CONCLUSIONS Dex reduces CSA-AKI, potentially by regulating metabolic disorders and reducing oxidative stress. Registered with the Chinese Clinical Study Registry (No. ChiCTR2100051804).
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Affiliation(s)
- Congli Zhang
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Yang Zhang
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Di Liu
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Mei Mei
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Nannan Song
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Qin Zhuang
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Yiyao Jiang
- Department of Cardiac Surgery, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Yuanyuan Guo
- Department of Urology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Gang Liu
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Xiaohong Li
- Department of Anesthesiology, First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China.
| | - Li Ren
- School of Laboratory Medicine, Bengbu Medical University, Bengbu, Anhui, China.
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Guo X, Zhou J, La Yan, Liu X, Yuan Y, Ye J, Zhang Z, Chen H, Ma Y, Zhong Z, Luo G, Chen H. Very long-chain fatty acids control peroxisome dynamics via a feedback loop in intestinal stem cells during gut regeneration. Dev Cell 2024:S1534-5807(24)00398-8. [PMID: 39047737 DOI: 10.1016/j.devcel.2024.06.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 04/19/2024] [Accepted: 06/25/2024] [Indexed: 07/27/2024]
Abstract
Peroxisome dynamics are crucial for intestinal stem cell (ISC) differentiation and gut regeneration. However, the precise mechanisms that govern peroxisome dynamics within ISCs during gut regeneration remain unknown. Using mouse colitis and Drosophila intestine models, we have identified a negative-feedback control mechanism involving the transcription factors peroxisome proliferator-activated receptors (PPARs) and SOX21. This feedback mechanism effectively regulates peroxisome abundance during gut regeneration. Following gut injury, the released free very long-chain fatty acids (VLCFAs) increase peroxisome abundance by stimulating PPARs-PEX11s signaling. PPARs act to stimulate peroxisome fission and inhibit pexophagy. SOX21, which acts downstream of peroxisomes during ISC differentiation, induces peroxisome elimination through pexophagy while repressing PPAR expression. Hence, PPARs and SOX21 constitute a finely tuned negative-feedback loop that regulates peroxisome dynamics. These findings shed light on the complex molecular mechanisms underlying peroxisome regulation in ISCs, contributing to our understanding of gut renewal and repair.
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Affiliation(s)
- Xiaoxin Guo
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China; Sichuan Provincial Key Laboratory for Human Disease Gene Study, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Juanyu Zhou
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - La Yan
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Xingzhu Liu
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yu Yuan
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Jinbao Ye
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Zehong Zhang
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Haiou Chen
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yongxin Ma
- Department of Medical Genetics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University and Collaborative Innovation Center, Chengdu, Sichuan 610041, China
| | - Zhendong Zhong
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
| | - Guanzheng Luo
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
| | - Haiyang Chen
- West China Centre of Excellence for Pancreatitis and Laboratory of Stem Cell and Anti-Aging Research, National Clinical Research Center for Geriatrics and State Key Laboratory of Respiratory Health and Multimorbidity, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China.
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Chrysopoulou M, Rinschen MM. Metabolic Rewiring and Communication: An Integrative View of Kidney Proximal Tubule Function. Annu Rev Physiol 2024; 86:405-427. [PMID: 38012048 DOI: 10.1146/annurev-physiol-042222-024724] [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] [Indexed: 11/29/2023]
Abstract
The kidney proximal tubule is a key organ for human metabolism. The kidney responds to stress with altered metabolite transformation and perturbed metabolic pathways, an ultimate cause for kidney disease. Here, we review the proximal tubule's metabolic function through an integrative view of transport, metabolism, and function, and embed it in the context of metabolome-wide data-driven research. Function (filtration, transport, secretion, and reabsorption), metabolite transformation, and metabolite signaling determine kidney metabolic rewiring in disease. Energy metabolism and substrates for key metabolic pathways are orchestrated by metabolite sensors. Given the importance of renal function for the inner milieu, we also review metabolic communication routes with other organs. Exciting research opportunities exist to understand metabolic perturbation of kidney and proximal tubule function, for example, in hypertension-associated kidney disease. We argue that, based on the integrative view outlined here, kidney diseases without genetic cause should be approached scientifically as metabolic diseases.
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Affiliation(s)
| | - Markus M Rinschen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark;
- III. Department of Medicine and Hamburg Center for Kidney Health, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Aarhus Institute of Advanced Studies, Aarhus University, Aarhus, Denmark
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Rauckhorst AJ, Vasquez Martinez G, Mayoral Andrade G, Wen H, Kim JY, Simoni A, Robles-Planells C, Mapuskar KA, Rastogi P, Steinbach EJ, McCormick ML, Allen BG, Pabla NS, Jackson AR, Coleman MC, Spitz DR, Taylor EB, Zepeda-Orozco D. Tubular mitochondrial pyruvate carrier disruption elicits redox adaptations that protect from acute kidney injury. Mol Metab 2024; 79:101849. [PMID: 38056691 PMCID: PMC10733108 DOI: 10.1016/j.molmet.2023.101849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 11/28/2023] [Accepted: 11/30/2023] [Indexed: 12/08/2023] Open
Abstract
OBJECTIVE Energy-intensive kidney reabsorption processes essential for normal whole-body function are maintained by tubular epithelial cell metabolism. Although tubular metabolism changes markedly following acute kidney injury (AKI), it remains unclear which metabolic alterations are beneficial or detrimental. By analyzing large-scale, publicly available datasets, we observed that AKI consistently leads to downregulation of the mitochondrial pyruvate carrier (MPC). This investigation aimed to understand the contribution of the tubular MPC to kidney function, metabolism, and acute injury severity. METHODS We generated tubular epithelial cell-specific Mpc1 knockout (MPC TubKO) mice and employed renal function tests, in vivo renal 13C-glucose tracing, mechanistic enzyme activity assays, and tests of injury and survival in an established rhabdomyolysis model of AKI. RESULTS MPC TubKO mice retained normal kidney function, displayed unchanged markers of kidney injury, but exhibited coordinately increased enzyme activities of the pentose phosphate pathway and the glutathione and thioredoxin oxidant defense systems. Following rhabdomyolysis-induced AKI, compared to WT control mice, MPC TubKO mice showed increased glycolysis, decreased kidney injury and oxidative stress markers, and strikingly increased survival. CONCLUSIONS Our findings suggest that decreased renal tubular mitochondrial pyruvate uptake hormetically upregulates oxidant defense systems before AKI and is a beneficial adaptive response after rhabdomyolysis-induced AKI. This raises the possibility of therapeutically modulating the MPC to attenuate AKI severity.
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Affiliation(s)
- Adam J Rauckhorst
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA; Fraternal Order of Eagles Diabetes Research Center (FOEDRC), University of Iowa, Iowa City, IA, USA; FOEDRC Metabolomics Core Research Facility, University of Iowa, Iowa City, IA, USA
| | - Gabriela Vasquez Martinez
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus OH, USA
| | - Gabriel Mayoral Andrade
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus OH, USA
| | - Hsiang Wen
- Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA, USA
| | - Ji Young Kim
- Division of Pharmaceutics and Pharmacology, College of Pharmacy & Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Aaron Simoni
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus OH, USA
| | - Claudia Robles-Planells
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus OH, USA
| | - Kranti A Mapuskar
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA; Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Prerna Rastogi
- Department of Pathology, University of Iowa, Iowa City, IA, USA
| | - Emily J Steinbach
- Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA, USA; Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA; Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Michael L McCormick
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA; Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Bryan G Allen
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA; Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Navjot S Pabla
- Division of Pharmaceutics and Pharmacology, College of Pharmacy & Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Ashley R Jackson
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus OH, USA; Department of Pediatrics, The Ohio State University, Columbus, OH, USA
| | - Mitchell C Coleman
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA; Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA; Department of Orthopedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
| | - Douglas R Spitz
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA; Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Eric B Taylor
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA; Fraternal Order of Eagles Diabetes Research Center (FOEDRC), University of Iowa, Iowa City, IA, USA; FOEDRC Metabolomics Core Research Facility, University of Iowa, Iowa City, IA, USA; Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA; Pappajohn Biomedical Institute, University of Iowa, Iowa City, IA, USA.
| | - Diana Zepeda-Orozco
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus OH, USA; Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA, USA; Department of Pediatrics, The Ohio State University, Columbus, OH, USA.
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Zhu Q, Li G, Ma L, Chen B, Zhang D, Gao J, Deng S, Chen Y. Virgin Camellia Seed Oil Improves Glycolipid Metabolism in the Kidney of High Fat-Fed Rats through AMPK-SREBP Pathway. Nutrients 2023; 15:4888. [PMID: 38068746 PMCID: PMC10708295 DOI: 10.3390/nu15234888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 11/17/2023] [Accepted: 11/21/2023] [Indexed: 12/18/2023] Open
Abstract
Camellia seed oil (CO) is used as edible oil in southern China because of its excellent fatty acid composition and abundant bioactive compounds. Chronic kidney disease (CKD) is one of the most common chronic degenerative diseases in China, and active compounds in vegetable oil, like virgin olive oil, have been demonstrated to be efficacious in the management of CKD. In this study, virgin CO was refined using a standard process. The refining had minimal impact on the fatty acid composition, but significantly reduced the presence of bioactive compounds like polyphenols in CO. Sprague-Dawley (SD) rats fed with high fat diet (Group G) were treated with either virgin (Group Z) or refined CO (Group R). The oral administration of CO alleviated lipid accumulation and decreased body and kidney weight gain. Furthermore, treatment with virgin CO increased the renal ATP content. The renal expression levels of AMPK and key enzymes involved in fatty acid oxidation (CPT-1 and ACOX1) and glycolysis (HK, PFK, PK and GAPDH) were up-regulated in Group Z, thereby enhancing the ATP production. Virgin CO treatment downregulated the expression level of SREBP2 and its downstream target genes, such as ACC, FAS, and HMGCR, which reduced lipid synthesis. These findings indicate that virgin CO improves glycolipid metabolism and restores energy homeostasis in the kidneys of rats fed with a high-fat diet by modulating the AMPK-SREBP-signaling pathway, suggesting the potential of active compounds in virgin CO for managing the renal failure associated with glycolipid dysmetabolism.
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Affiliation(s)
- Qinhe Zhu
- National Engineering Research Center of Oiltea Camellia, State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Shao Shan South Road, No. 658, Changsha 410004, China; (Q.Z.); (G.L.); (L.M.); (D.Z.)
- Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, School of Life and Health Sciences, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Guihui Li
- National Engineering Research Center of Oiltea Camellia, State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Shao Shan South Road, No. 658, Changsha 410004, China; (Q.Z.); (G.L.); (L.M.); (D.Z.)
- Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, School of Life and Health Sciences, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Li Ma
- National Engineering Research Center of Oiltea Camellia, State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Shao Shan South Road, No. 658, Changsha 410004, China; (Q.Z.); (G.L.); (L.M.); (D.Z.)
| | - Bolin Chen
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
| | - Dawei Zhang
- National Engineering Research Center of Oiltea Camellia, State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Shao Shan South Road, No. 658, Changsha 410004, China; (Q.Z.); (G.L.); (L.M.); (D.Z.)
- Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, School of Life and Health Sciences, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Jing Gao
- National Engineering Research Center of Oiltea Camellia, State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Shao Shan South Road, No. 658, Changsha 410004, China; (Q.Z.); (G.L.); (L.M.); (D.Z.)
| | - Senwen Deng
- National Engineering Research Center of Oiltea Camellia, State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Shao Shan South Road, No. 658, Changsha 410004, China; (Q.Z.); (G.L.); (L.M.); (D.Z.)
- Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, School of Life and Health Sciences, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Yongzhong Chen
- National Engineering Research Center of Oiltea Camellia, State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Shao Shan South Road, No. 658, Changsha 410004, China; (Q.Z.); (G.L.); (L.M.); (D.Z.)
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Icard P, Simula L, Zahn G, Alifano M, Mycielska ME. The dual role of citrate in cancer. Biochim Biophys Acta Rev Cancer 2023; 1878:188987. [PMID: 37717858 DOI: 10.1016/j.bbcan.2023.188987] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/04/2023] [Accepted: 09/07/2023] [Indexed: 09/19/2023]
Abstract
Citrate is a key metabolite of the Krebs cycle that can also be exported in the cytosol, where it performs several functions. In normal cells, citrate sustains protein acetylation, lipid synthesis, gluconeogenesis, insulin secretion, bone tissues formation, spermatozoid mobility, and immune response. Dysregulation of citrate metabolism is implicated in several pathologies, including cancer. Here we discuss how cancer cells use citrate to sustain their proliferation, survival, and metastatic progression. Also, we propose two paradoxically opposite strategies to reduce tumour growth by targeting citrate metabolism in preclinical models. In the first strategy, we propose to administer in the tumor microenvironment a high amount of citrate, which can then act as a glycolysis inhibitor and apoptosis inducer, whereas the other strategy targets citrate transporters to starve cancer cells from citrate. These strategies, effective in several preclinical in vitro and in vivo cancer models, could be exploited in clinics, particularly to increase sensibility to current anti-cancer agents.
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Affiliation(s)
- Philippe Icard
- Normandie Univ, UNICAEN, INSERM U1086 Interdisciplinary Research Unit for Cancer Prevention and Treatment, Caen, France; Service of Thoracic Surgery, Cochin Hospital, AP-, HP, 75014, Paris, France.
| | - Luca Simula
- Cochin Institute, INSERM U1016, CNRS UMR8104, University of Paris-Cité, Paris 75014, France
| | | | - Marco Alifano
- Service of Thoracic Surgery, Cochin Hospital, AP-, HP, 75014, Paris, France; INSERM U1138, Integrative Cancer Immunology, University of Paris, 75006 Paris, France
| | - Maria E Mycielska
- Department of Structural Biology, Institute of Biophysics and Physical Biochemistry, University of Regensburg, 93053 Regensburg, Germany
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Rebelos E, Mari A, Oikonen V, Iida H, Nuutila P, Ferrannini E. Evaluation of renal glucose uptake with [ 18F]FDG-PET: Methodological advancements and metabolic outcomes. Metabolism 2023; 141:155382. [PMID: 36565992 DOI: 10.1016/j.metabol.2022.155382] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 12/06/2022] [Accepted: 12/16/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND/PURPOSE Studying renal glucose metabolism non-invasively in humans is an unmet need. Positron emission tomography (PET) is the current gold standard for measuring regional tissue glucose uptake rates, but the most widely used glucose analog ([18F]FDG) is not a good substrate for sodium-glucose cotransporters (SGLTs). As a consequence, [18F]FDG spills over into the urine and [18F]FDG-PET considerably underestimates published rates of whole renal glucose uptake obtained using the arterial-venous difference technique. Our aim was to assess whether [18F]FDG-PET can be used in the study of renal glucose metabolism in humans. METHODS We measured individual [18F]FDG radioactivity in the urine and estimated intraluminal [18F]FDG radioactivity concentration; these values were used to correct renal [18F]FDG-PET data acquired ∼90 min from tracer injection under fasting conditions and during an insulin clamp in 9 lean and 16 obese subjects. RESULTS We found that the corrected glucose uptake is consistently higher in the medulla than cortex and that both cortical and medullary glucose uptake are higher in lean than obese participants under both fasting and insulinized conditions. Moreover, cortical but not medullary glucose uptake is increased from the fasting to the insulinized condition. CONCLUSION The data show for the first time that [18F]FDG-PET can still provide relevant physiological information on regional renal glucose uptake on the condition that [18F]FDG uptake is corrected for tubular radioactivity.
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Affiliation(s)
- Eleni Rebelos
- Turku PET Centre, University of Turku, Turku, Finland; CNR Institute of Clinical Physiology, Pisa, Italy.
| | - Andrea Mari
- CNR Institute of Neuroscience, Padova, Italy
| | - Vesa Oikonen
- Turku PET Centre, University of Turku, Turku, Finland
| | - Hidehiro Iida
- Turku PET Centre, University of Turku, Turku, Finland
| | - Pirjo Nuutila
- Turku PET Centre, University of Turku, Turku, Finland; Department of Endocrinology, Turku University Hospital, Turku, Finland
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8
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Nyrén R, Scherman H, Axelsson J, Chang CL, Olivecrona G, Ericsson M. Visualizing increased uptake of [18F]FDG and [18F]FTHA in kidneys from obese high-fat diet fed C57BL/6J mice using PET/CT ex vivo. PLoS One 2023; 18:e0281705. [PMID: 36787333 PMCID: PMC9928095 DOI: 10.1371/journal.pone.0281705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 01/31/2023] [Indexed: 02/15/2023] Open
Abstract
It is known that high-fat diet (HFD) and/or diabetes may influence substrate preferences and energy demands in the heart preceding diabetic cardiomyopathy. They may also induce structural glomerular changes causing diabetic nephropathy. PET/CT has been utilized to examine uptake of energy substrates, and to study metabolic changes or shifts before onset of metabolic disorders. However, conventional PET/CT scanning of organs with relatively low uptake, such as the kidney, in small animals in vivo may render technical difficulties. To address this issue, we developed a PET/CT ex vivo protocol with radiolabeled glucose and fatty acid analouges, [18F]FDG and [18F]FTHA,to study substrate uptake in mouse kidneys. We also aimed to detect a possible energy substrate shift before onset of diabetic nephropathy. The ex vivo protocol reduced interfering background as well as interindividual variances. We found increased uptake of [18F]FDG and [18F]FTHA in kidneys after HFD, compared to kidneys from young mice on standard chow. Levels of kidney triglycerides also increased on HFD. Lipoprotein lipase (LPL) activity, the enzyme responsible for release of fatty acids from circulating lipoproteins, is normally increased in postprandial mice kidneys. After long-term HFD, we found that LPL activity was suppressed, and could therefore not explain the increased levels of stored triglycerides. Suppressed LPL activity was associated with increased expression of angiopoietin-like protein4, an inhibitor of LPL. HFD did not alter the transcriptional control of some common glucose and fatty acid transporters that may mediate uptake of [18F]FDG and [18F]FTHA. Performing PET/CT ex vivo reduced interfering background and interindividual variances. Obesity and insulin resistance induced by HFD increased the uptake of [18F]FDG and [18F]FTHA and triglyceride accumulation in mouse kidneys. Increased levels of [18F]FDG and [18F]FTHA in obese insulin resistant mice could be used clinically as an indicator of poor metabolic control, and a complementary test for incipient diabetic nephropathy.
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Affiliation(s)
- Rakel Nyrén
- Department of Medical Biosciences/Physiological Chemistry, Umeå University, Umeå, Sweden
- Department of Medical Biosciences/Pathology, Umeå University, Umeå, Sweden
| | - Henrik Scherman
- Department of Radiation Sciences, Umeå University, Umeå, Sweden
| | - Jan Axelsson
- Department of Radiation Sciences, Umeå University, Umeå, Sweden
| | - Chuchun L. Chang
- Institute of Human Nutrition, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, New York, United States of America
| | - Gunilla Olivecrona
- Department of Medical Biosciences/Physiological Chemistry, Umeå University, Umeå, Sweden
| | - Madelene Ericsson
- Department of Medical Biosciences/Physiological Chemistry, Umeå University, Umeå, Sweden
- Umeå Centre for Molecular Medicine, Umeå University, Umeå, Sweden
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9
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Huang W, Cao G, Deng C, Chen Y, Wang T, Chen D, Cai Z. Adverse effects of triclosan on kidney in mice: Implication of lipid metabolism disorders. J Environ Sci (China) 2023; 124:481-490. [PMID: 36182156 DOI: 10.1016/j.jes.2021.11.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/23/2021] [Accepted: 11/26/2021] [Indexed: 06/16/2023]
Abstract
Triclosan (TCS) is a ubiquitous antimicrobial used in daily consumer products. Previous reports have shown that TCS could induce hepatotoxicity, endocrine disruption, disturbance on immune function and impaired thyroid function. Kidney is critical in the elimination of toxins, while the effects of TCS on kidney have not yet been well-characterized. The aim of the present study was to investigate the effects of TCS exposure on kidney function and the possible underlying mechanisms in mice. Male C57BL/6 mice were orally exposed to TCS with the doses of 10 and 100 mg/(kg•day) for 13 weeks. TCS was dissolved in dimethyl sulfoxide (DMSO) and diluted by corn oil for exposure. Corn oil containing DMSO was used as vehicle control. Serum and kidney tissues were collected for study. Biomarkers associated with kidney function, oxidative stress, inflammation and fibrosis were assessed. Our results showed that TCS could cause renal injury as was revealed by increased levels of renal function markers including serum creatinine, urea nitrogen and uric acid, as well as increased oxidative stress, pro-inflammatory cytokines and fibrotic markers in a dose dependent manner, which were more significantly in 100 mg/(kg•day) group. Mass spectrometry-based analysis of metabolites related with lipid metabolism demonstrated the occurrence of lipid accumulation and defective fatty acid oxidation in 100 mg/(kg•day) TCS-exposed mouse kidney. These processes might lead to lipotoxicity and energy depletion, thus resulting in kidney fibrosis and functional decline. Taken together, the present study demonstrated that TCS could induce lipid accumulation and fatty acid metabolism disturbance in mouse kidney, which might contribute to renal function impairment. The present study further widens our insights into the adverse effects of TCS.
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Affiliation(s)
- Wei Huang
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong 999077, China; School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China
| | - Guodong Cao
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong 999077, China
| | - Chengliang Deng
- School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China
| | - Yanyan Chen
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong 999077, China
| | - Tao Wang
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong 999077, China; Analysis Center, School of Pharmacy, Guangdong Medical University, Dongguan 523808, China
| | - Da Chen
- School of Environment, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China
| | - Zongwei Cai
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong 999077, China.
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10
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Rauckhorst AJ, Martinez GV, Andrade GM, Wen H, Kim JY, Simoni A, Mapuskar KA, Rastogi P, Steinbach EJ, McCormick ML, Allen BG, Pabla NS, Jackson AR, Coleman MC, Spitz DR, Taylor EB, Zepeda-Orozco D. Tubular Mitochondrial Pyruvate Carrier Disruption Elicits Redox Adaptations that Protect from Acute Kidney Injury. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.31.526492. [PMID: 36778297 PMCID: PMC9915694 DOI: 10.1101/2023.01.31.526492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Energy-intensive kidney reabsorption processes essential for normal whole-body function are maintained by tubular epithelial cell metabolism. Tubular metabolism changes markedly following acute kidney injury (AKI), but which changes are adaptive versus maladaptive remain poorly understood. In publicly available data sets, we noticed a consistent downregulation of the mitochondrial pyruvate carrier (MPC) after AKI, which we experimentally confirmed. To test the functional consequences of MPC downregulation, we generated novel tubular epithelial cell-specific Mpc1 knockout (MPC TubKO) mice. 13C-glucose tracing, steady-state metabolomic profiling, and enzymatic activity assays revealed that MPC TubKO coordinately increased activities of the pentose phosphate pathway and the glutathione and thioredoxin oxidant defense systems. Following rhabdomyolysis-induced AKI, MPC TubKO decreased markers of kidney injury and oxidative damage and strikingly increased survival. Our findings suggest that decreased mitochondrial pyruvate uptake is a central adaptive response following AKI and raise the possibility of therapeutically modulating the MPC to attenuate AKI severity.
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Affiliation(s)
- Adam J. Rauckhorst
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA
- Fraternal Order of Eagles Diabetes Research Center (FOEDRC), University of Iowa, Iowa City, IA, USA
- FOEDRC Metabolomics Core Research Facility, University of Iowa, Iowa City, IA, USA
| | - Gabriela Vasquez Martinez
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus OH, USA
| | - Gabriel Mayoral Andrade
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus OH, USA
| | - Hsiang Wen
- Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA, USA
| | - Ji Young Kim
- Division of Pharmaceutics and Pharmacology, College of Pharmacy & Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Aaron Simoni
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus OH, USA
| | - Kranti A. Mapuskar
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA
- Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Prerna Rastogi
- Department of Pathology, University of Iowa, Iowa City, IA, USA
| | - Emily J Steinbach
- Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA, USA
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA
- Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Michael L. McCormick
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA
- Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Bryan G. Allen
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA
- Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Navjot S. Pabla
- Division of Pharmaceutics and Pharmacology, College of Pharmacy & Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Ashley R. Jackson
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus OH, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH, USA
| | - Mitchell C. Coleman
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA
- Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
- Department of Orthopedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
| | - Douglas R. Spitz
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa, Iowa City, IA, USA
- Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
| | - Eric B. Taylor
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA
- Fraternal Order of Eagles Diabetes Research Center (FOEDRC), University of Iowa, Iowa City, IA, USA
- FOEDRC Metabolomics Core Research Facility, University of Iowa, Iowa City, IA, USA
- Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA, USA
- Pappajohn Biomedical Institute, University of Iowa, Iowa City, IA, USA
| | - Diana Zepeda-Orozco
- Kidney and Urinary Tract Research Center, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus OH, USA
- Stead Family Department of Pediatrics, University of Iowa, Iowa City, IA, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH, USA
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11
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Zhao C, Li L, Li C, Tang C, Cai J, Liu Y, Yang J, Xi Y, Yang M, Jiang N, Han Y, Liu Y, Luo S, Xiao L, Sun L. PACS-2 deficiency in tubular cells aggravates lipid-related kidney injury in diabetic kidney disease. Mol Med 2022; 28:117. [PMID: 36138342 PMCID: PMC9502582 DOI: 10.1186/s10020-022-00545-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 09/09/2022] [Indexed: 11/18/2022] Open
Abstract
Background Lipid accumulation in tubular cells plays a key role in diabetic kidney disease (DKD). Targeting lipid metabolism disorders has clinical value in delaying the progression of DKD, but the precise mechanism by which molecules mediate lipid-related kidney injury remains unclear. Phosphofurin acidic cluster sorting protein 2 (PACS-2) is a multifunctional sorting protein that plays a role in lipid metabolism. This study determined the role of PACS-2 in lipid-related kidney injury in DKD. Methods Diabetes was induced by a high-fat diet combined with intraperitoneal injections of streptozotocin (HFD/STZ) in proximal tubule-specific knockout of Pacs-2 mice (PT-Pacs-2−/− mice) and the control mice (Pacs-2fl/fl mice). Transcriptomic analysis was performed between Pacs-2fl/fl mice and PT-Pacs-2−/− mice. Results Diabetic PT-Pacs-2−/− mice developed more severe tubule injury and proteinuria compared to diabetic Pacs-2fl/fl mice, which accompanied with increasing lipid synthesis, uptake and decreasing cholesterol efflux as well as lipid accumulation in tubules of the kidney. Furthermore, transcriptome analysis showed that the mRNA level of sterol O-acyltransferase 1 (Soat1) was up-regulated in the kidney of control PT-Pacs-2−/− mice. Transfection of HK2 cells with PACS-2 siRNA under high glucose plus palmitic acid (HGPA) condition aggravated lipid deposition and increased the expression of SOAT1 and sterol regulatory element-binding proteins (SREBPs), while the effect was blocked partially in that of co-transfection of SOAT1 siRNA. Conclusions PACS-2 has a protective role against lipid-related kidney injury in DKD through SOAT1/SREBPs signaling. Supplementary Information The online version contains supplementary material available at 10.1186/s10020-022-00545-x.
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Affiliation(s)
- Chanyue Zhao
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Li Li
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Chenrui Li
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Chengyuan Tang
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Juan Cai
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Yu Liu
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Jinfei Yang
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Yiyun Xi
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Ming Yang
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Na Jiang
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Yachun Han
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Yan Liu
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Shilu Luo
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Li Xiao
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China
| | - Lin Sun
- Department of Nephrology, Hunan Key Laboratory of Kidney Disease and Blood Purification, The Second Xiangya Hospital, Central South University, No.139 Renmin Middle Road, Changsha, 410011, Hunan, China.
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12
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Gao Z, Chen X. Fatty Acid β-Oxidation in Kidney Diseases: Perspectives on Pathophysiological Mechanisms and Therapeutic Opportunities. Front Pharmacol 2022; 13:805281. [PMID: 35517820 PMCID: PMC9065343 DOI: 10.3389/fphar.2022.805281] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 03/31/2022] [Indexed: 11/13/2022] Open
Abstract
The kidney is a highly metabolic organ and requires a large amount of ATP to maintain its filtration-reabsorption function, and mitochondrial fatty acid β-oxidation serves as the main source of energy to meet its functional needs. Reduced and inefficient fatty acid β-oxidation is thought to be a major mechanism contributing to kidney diseases, including acute kidney injury, chronic kidney disease and diabetic nephropathy. PPARα, AMPK, sirtuins, HIF-1, and TGF-β/SMAD3 activation have all been shown to play key roles in the regulation of fatty acid β-oxidation in kidney diseases, and restoration of fatty acid β-oxidation by modulation of these molecules can ameliorate the development of such diseases. Here, we disentangle the lipid metabolism regulation properties and potential mechanisms of mesenchymal stem cells and their extracellular vesicles, and emphasize the role of mesenchymal stem cells on lipid metabolism. This review aims to highlight the important role of fatty acid β-oxidation in the progression of kidney diseases, and to explore the fatty acid β-oxidation effects and therapeutic potential of mesenchymal stem cells for kidney diseases.
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Affiliation(s)
- Zhumei Gao
- Department of Nephrology, The Second Hospital of Jilin University, Jilin, China
| | - Xiangmei Chen
- Department of Nephrology, The Second Hospital of Jilin University, Jilin, China.,Department of Nephrology, The First Medical Center, Chinese PLA General Hospital, Beijing, China
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13
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Xu S, Jia P, Fang Y, Jin J, Sun Z, Zhou W, Li J, Zhang Y, Wang X, Ren T, Zou Z, Ding X. Nuclear farnesoid X receptor attenuates acute kidney injury through fatty acid oxidation. Kidney Int 2022; 101:987-1002. [DOI: 10.1016/j.kint.2022.01.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 12/28/2021] [Accepted: 01/11/2022] [Indexed: 12/14/2022]
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14
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Bobulescu IA, Pop LM, Mani C, Turner K, Rivera C, Khatoon S, Kairamkonda S, Hannan R, Palle K. Renal Lipid Metabolism Abnormalities in Obesity and Clear Cell Renal Cell Carcinoma. Metabolites 2021; 11:608. [PMID: 34564424 PMCID: PMC8470169 DOI: 10.3390/metabo11090608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/03/2021] [Accepted: 09/03/2021] [Indexed: 02/07/2023] Open
Abstract
Clear cell renal cell carcinoma is the most common and deadly type of cancer affecting the kidney, and is characterized histologically by large intracellular lipid deposits. These deposits are thought to result from lipid metabolic reprogramming occurring in tumor cells, but the exact mechanisms and implications of these metabolic alterations are incompletely understood. Obesity is an independent risk factor for clear cell renal cell carcinoma, and is also associated with lipid accumulation in noncancerous epithelial cells of the proximal tubule, where clear cell renal cell carcinoma originates. This article explores the potential link between obesity-associated renal lipid metabolic disturbances and lipid metabolic reprogramming in clear cell renal cell carcinoma, and discusses potential implications for future research.
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Affiliation(s)
- Ion Alexandru Bobulescu
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA; (C.M.); (K.T.); (C.R.); (S.K.); (S.K.); (K.P.)
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA
| | - Laurentiu M. Pop
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX 79430-6540, USA; (L.M.P.); (R.H.)
| | - Chinnadurai Mani
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA; (C.M.); (K.T.); (C.R.); (S.K.); (S.K.); (K.P.)
| | - Kala Turner
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA; (C.M.); (K.T.); (C.R.); (S.K.); (S.K.); (K.P.)
| | - Christian Rivera
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA; (C.M.); (K.T.); (C.R.); (S.K.); (S.K.); (K.P.)
| | - Sabiha Khatoon
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA; (C.M.); (K.T.); (C.R.); (S.K.); (S.K.); (K.P.)
| | - Subash Kairamkonda
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA; (C.M.); (K.T.); (C.R.); (S.K.); (S.K.); (K.P.)
| | - Raquibul Hannan
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX 79430-6540, USA; (L.M.P.); (R.H.)
| | - Komaraiah Palle
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA; (C.M.); (K.T.); (C.R.); (S.K.); (S.K.); (K.P.)
- Department of Surgery, Texas Tech University Health Sciences Center, Lubbock, TX 79430-6540, USA
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15
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Ranea-Robles P, Portman K, Bender A, Lee K, He JC, Mulholland DJ, Argmann C, Houten SM. Peroxisomal L-bifunctional protein (EHHADH) deficiency causes male-specific kidney hypertrophy and proximal tubular injury in mice. KIDNEY360 2021; 2:1441-1454. [PMID: 34651140 PMCID: PMC8513500 DOI: 10.34067/kid.0003772021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Proximal tubular (PT) cells are enriched in mitochondria and peroxisomes. Whereas mitochondrial fatty acid oxidation (FAO) plays an important role in kidney function by supporting the high-energy requirements of PT cells, the role of peroxisomal metabolism remains largely unknown. EHHADH, also known as L-bifunctional protein, catalyzes the second and third step of peroxisomal FAO. METHODS We studied kidneys of WT and Ehhadh KO mice on a C57BL/6N background using histology, immunohistochemistry, immunofluorescence, immunoblot, RNA-sequencing, and metabolomics. To assess the role of androgens in the kidney phenotype of Ehhadh KO mice, mice underwent orchiectomy. RESULTS We observed male-specific kidney hypertrophy and glomerular filtration rate reduction in adult Ehhadh KO mice. Transcriptome analysis unveiled a gene expression signature similar to PT injury in acute kidney injury mouse models. This was further illustrated by the presence of KIM-1 (kidney injury molecule-1), SOX-9, and Ki67-positive cells in the PT of male Ehhadh KO kidneys. Male Ehhadh KO kidneys had metabolite changes consistent with peroxisomal dysfunction as well as an elevation in glycosphingolipid levels. Orchiectomy of Ehhadh KO mice decreased the number of KIM-1 positive cells to WT levels. We revealed a pronounced sexual dimorphism in the expression of peroxisomal FAO proteins in mouse kidney, underlining a role of androgens in the kidney phenotype of Ehhadh KO mice. CONCLUSIONS Our data highlight the importance of EHHADH and peroxisomal metabolism in male kidney physiology and reveal peroxisomal FAO as a sexual dimorphic metabolic pathway in mouse kidneys.
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Affiliation(s)
- Pablo Ranea-Robles
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Kensey Portman
- Division of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Aaron Bender
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Kyung Lee
- Department of Medicine, Division of Nephrology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - John Cijiang He
- Department of Medicine, Division of Nephrology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - David J. Mulholland
- Division of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Carmen Argmann
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Sander M. Houten
- Department of Genetics and Genomic Sciences, Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mount Sinai, New York, New York
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16
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Yu X, Xu M, Meng X, Li S, Liu Q, Bai M, You R, Huang S, Yang L, Zhang Y, Jia Z, Zhang A. Nuclear receptor PXR targets AKR1B7 to protect mitochondrial metabolism and renal function in AKI. Sci Transl Med 2021; 12:12/543/eaay7591. [PMID: 32404507 DOI: 10.1126/scitranslmed.aay7591] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 03/20/2020] [Indexed: 12/20/2022]
Abstract
Acute kidney injury (AKI) is a worldwide public health problem with no specific and satisfactory therapies in clinic. The nuclear pregnane X receptor (PXR) is involved in the progression of multiple diseases, including metabolic diseases, atherosclerosis, hypertension, liver injury, etc. However, its role in kidney injury remains to be understood. In this study, we have investigated the role of PXR in AKI and underlying mechanism(s) involved in its function. PXR was robustly down-regulated and negatively correlated with renal dysfunction in human and animal kidneys with AKI. Silencing PXR in rats enhanced cisplatin-induced AKI and induced severe mitochondrial abnormalities, whereas activating PXR protected against AKI. Using luciferase reporter assays, genomic manipulation, and proteomics data analysis on the kidneys of PXR-/- rats, we determined that PXR targeted Aldo-keto reductase family 1, member B7 (AKR1B7) to improve mitochondrial function, thereby ameliorating AKI. We confirmed the protective role of PXR against kidney injury using genomic and pharmacologic approaches in an ischemia/reperfusion model of AKI. These findings demonstrate that disabling the PXR/AKR1B7/mitochondrial metabolism axis is an important factor that can contribute to AKI, whereas reestablishing this axis can be useful for treating AKI.
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Affiliation(s)
- Xiaowen Yu
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Man Xu
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Xia Meng
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Shumin Li
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Qianqi Liu
- Department of Endocrinology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China
| | - Mi Bai
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Ran You
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Songming Huang
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Li Yang
- Department of Nephrology, Peking University First Hospital, Beijing 100034, China
| | - Yue Zhang
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China. .,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Zhanjun Jia
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China. .,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
| | - Aihua Zhang
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China. .,Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, China
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17
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Pemafibrate Protects against Fatty Acid-Induced Nephropathy by Maintaining Renal Fatty Acid Metabolism. Metabolites 2021; 11:metabo11060372. [PMID: 34207854 PMCID: PMC8230306 DOI: 10.3390/metabo11060372] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/25/2021] [Accepted: 06/07/2021] [Indexed: 12/12/2022] Open
Abstract
As classical agonists for peroxisomal proliferator-activated receptor alpha (PPARα), fibrates activate renal fatty acid metabolism (FAM) and provide renoprotection. However, fibrate prescription is limited in patients with kidney disease, since impaired urinary excretion of the drug causes serious adverse effects. Pemafibrate (PEM), a novel selective PPARα modulator, is mainly excreted in bile, and, thus, may be safe and effective in kidney disease patients. It remains unclear, however, whether PEM actually exhibits renoprotective properties. We investigated this issue using mice with fatty acid overload nephropathy (FAON). PEM (0.5 mg/kg body weight/day) or a vehicle was administered for 20 days to 13-week-old wild-type male mice, which were simultaneously injected with free fatty acid (FFA)-binding bovine serum albumin from day 7 to day 20 to induce FAON. All mice were sacrificed on day 20 for assessment of the renoprotective effect of PEM against FAON. PEM significantly attenuated the histological findings of tubular injury caused by FAON, increased the renal expressions of mRNA and proteins related to FAM, and decreased renal FFA content and oxidative stress. Taken together, PEM exhibits renoprotective effects through the activation and maintenance of renal FAM and represents a promising drug for kidney disease.
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18
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Sugar or Fat? Renal Tubular Metabolism Reviewed in Health and Disease. Nutrients 2021; 13:nu13051580. [PMID: 34065078 PMCID: PMC8151053 DOI: 10.3390/nu13051580] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 04/24/2021] [Accepted: 04/30/2021] [Indexed: 12/31/2022] Open
Abstract
The kidney is a highly metabolically active organ that relies on specialized epithelial cells comprising the renal tubules to reabsorb most of the filtered water and solutes. Most of this reabsorption is mediated by the proximal tubules, and high amounts of energy are needed to facilitate solute movement. Thus, proximal tubules use fatty acid oxidation, which generates more adenosine triphosphate (ATP) than glucose metabolism, as its preferred metabolic pathway. After kidney injury, metabolism is altered, leading to decreased fatty acid oxidation and increased lactic acid generation. This review discusses how metabolism differs between the proximal and more distal tubular segments of the healthy nephron. In addition, metabolic changes in acute kidney injury and chronic kidney disease are discussed, as well as how these changes in metabolism may impact tubule repair and chronic kidney disease progression.
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19
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Hinden L, Kogot-Levin A, Tam J, Leibowitz G. Pathogenesis of diabesity-induced kidney disease: role of kidney nutrient sensing. FEBS J 2021; 289:901-921. [PMID: 33630415 DOI: 10.1111/febs.15790] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 02/09/2021] [Accepted: 02/24/2021] [Indexed: 12/11/2022]
Abstract
Diabetes kidney disease (DKD) is a major healthcare problem associated with increased risk for developing end-stage kidney disease and high mortality. It is widely accepted that DKD is primarily a glomerular disease. Recent findings however suggest that kidney proximal tubule cells (KPTCs) may play a central role in the pathophysiology of DKD. In diabetes and obesity, KPTCs are exposed to nutrient overload, including glucose, free-fatty acids and amino acids, which dysregulate nutrient and energy sensing by mechanistic target of rapamycin complex 1 and AMP-activated protein kinase, with subsequent induction of tubular injury, inflammation, and fibrosis. Pharmacological treatments that modulate nutrient sensing and signaling in KPTCs, including cannabinoid-1 receptor antagonists and sodium glucose transporter 2 inhibitors, exert robust kidney protective effects. Shedding light on how nutrients are sensed and metabolized in KPTCs and in other kidney domains, and on their effects on signal transduction pathways that mediate kidney injury, is important for understanding the pathophysiology of DKD and for the development of novel therapeutic approaches in DKD and probably also in other forms of kidney disease.
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Affiliation(s)
- Liad Hinden
- Obesity and Metabolism Laboratory, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Israel
| | - Aviram Kogot-Levin
- Diabetes Unit and Endocrine Service, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Joseph Tam
- Obesity and Metabolism Laboratory, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Israel
| | - Gil Leibowitz
- Diabetes Unit and Endocrine Service, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
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20
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Miceli C, Roccio F, Penalva-Mousset L, Burtin M, Leroy C, Nemazanyy I, Kuperwasser N, Pontoglio M, Friedlander G, Morel E, Terzi F, Codogno P, Dupont N. The primary cilium and lipophagy translate mechanical forces to direct metabolic adaptation of kidney epithelial cells. Nat Cell Biol 2020; 22:1091-1102. [PMID: 32868900 DOI: 10.1038/s41556-020-0566-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 07/28/2020] [Indexed: 12/19/2022]
Abstract
Organs and cells must adapt to shear stress induced by biological fluids, but how fluid flow contributes to the execution of specific cell programs is poorly understood. Here we show that shear stress favours mitochondrial biogenesis and metabolic reprogramming to ensure energy production and cellular adaptation in kidney epithelial cells. Shear stress stimulates lipophagy, contributing to the production of fatty acids that provide mitochondrial substrates to generate ATP through β-oxidation. This flow-induced process is dependent on the primary cilia located on the apical side of epithelial cells. The interplay between fluid flow and lipid metabolism was confirmed in vivo using a unilateral ureteral obstruction mouse model. Finally, primary cilium-dependent lipophagy and mitochondrial biogenesis are required to support energy-consuming cellular processes such as glucose reabsorption, gluconeogenesis and cytoskeletal remodelling. Our findings demonstrate how primary cilia and autophagy are involved in the translation of mechanical forces into metabolic adaptation.
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Affiliation(s)
- Caterina Miceli
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France.,Center for Autophagy Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Federica Roccio
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Lucille Penalva-Mousset
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Martine Burtin
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Christine Leroy
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Ivan Nemazanyy
- Platform for Metabolic Analyses, Structure Fédérative de Recherche Necker, INSERM US24/CNRS UMS 3633, Paris, France
| | - Nicolas Kuperwasser
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Marco Pontoglio
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Gérard Friedlander
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Etienne Morel
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Fabiola Terzi
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France
| | - Patrice Codogno
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France.
| | - Nicolas Dupont
- Institut Necker Enfants-Malades (INEM), INSERM U1151/CNRS UMR 8253, Université de Paris, Paris, France.
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21
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Badmus OO, Sabinari IW, Olatunji LA. Dexamethasone increases renal free fatty acids and xanthine oxidase activity in female rats: could there be any gestational impact? Drug Chem Toxicol 2020; 45:886-897. [PMID: 32597234 DOI: 10.1080/01480545.2020.1784190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Dexamethasone (DEX) is used for various conditions in female and even during pregnancy. We tested the hypothesis that DEX exposure in female rats would lead to renal free fatty acid (FFA) accumulation with elevated xanthine oxidase (XO) activity that would be aggravated by pregnancy. Twenty-four female rats (n = 6/group) were randomly assigned to non-pregnant (NPR), DEX-exposed non-pregnant (NPR + DEX), pregnant (PRE) and DEX-exposed pregnant (PRE + DEX), respectively. NPR and PRE rats received vehicle (po) while NPR + DEX and PRE + DEX groups received DEX (0.2 mg/kg; po), between gestational days 14 and 19. Data showed that DEX exposure caused increased plasma creatinine, urea, renal FFA accumulation, lipid peroxidation, aminotranferases, depressed glutathione, increased activity of XO, and elevated uric acid in both pregnant and non-pregnant rats. The findings of this study indicate that DEX exposure would cause renal FFA accumulation and glutathione depletion that are accompanied by increased activity of XO/uric acid independently of gestation. The study also implies that DEX-induced renal damage could be worsened by gestation.
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Affiliation(s)
- Olufunto O Badmus
- HOPE Cardiometabolic Research Team and Department of Physiology, College of Health Sciences, University of Ilorin, Ilorin, Nigeria.,Department of Public Health, Kwara State University, Malete, Nigeria
| | - Isaiah W Sabinari
- HOPE Cardiometabolic Research Team and Department of Physiology, College of Health Sciences, University of Ilorin, Ilorin, Nigeria
| | - Lawrence A Olatunji
- HOPE Cardiometabolic Research Team and Department of Physiology, College of Health Sciences, University of Ilorin, Ilorin, Nigeria
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22
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Yang S, Cao C, Deng T, Zhou Z. Obesity-Related Glomerulopathy: A Latent Change in Obesity Requiring More Attention. Kidney Blood Press Res 2020; 45:510-522. [PMID: 32498064 DOI: 10.1159/000507784] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 04/06/2020] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Obesity has become a major public health problem, and the prevalence of kidney diseases has increased in parallel. Among kidney diseases caused by metabolic disorders, obesity-related glomerulopathy (ORG) is secondary to obesity. SUMMARY ORG is mainly caused by glomerular hyperfiltration, dysregulation of hormone and cytokine secretion in adipose tissues, and ectopic lipid accumulation in renal cells. ORG is pathologically characterized by glomerular hypertrophy, with or without focal and segmental glomerulosclerosis. Patients with ORG usually present with proteinuria concomitant with metabolic disorders such as dyslipidemia and hypertension. Weight loss, RAAS inhibitors, and improved insulin resistance can reduce the progression of ORG. CONCLUSION ORG is a growing renal pathological change in obese individuals, and a comprehensive understanding of the disease is pivotal to avoid its occurrence and improve quality of life for those with obesity. Key Messages:This review comprehensively describes the characteristics of ORG in pathological changes, clinical manifestations, pathogeneses and treatments.
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Affiliation(s)
- Shuting Yang
- Department of Metabolism and Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Diabetes Immunology (Central South University), Ministry of Education, Changsha, China.,National Clinical Research Center for Metabolic Diseases, Changsha, China
| | - Chuqing Cao
- Department of Metabolism and Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Diabetes Immunology (Central South University), Ministry of Education, Changsha, China.,National Clinical Research Center for Metabolic Diseases, Changsha, China
| | - Tuo Deng
- Department of Metabolism and Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Diabetes Immunology (Central South University), Ministry of Education, Changsha, China.,National Clinical Research Center for Metabolic Diseases, Changsha, China
| | - Zhiguang Zhou
- Department of Metabolism and Endocrinology, The Second Xiangya Hospital, Central South University, Changsha, China, .,Key Laboratory of Diabetes Immunology (Central South University), Ministry of Education, Changsha, China, .,National Clinical Research Center for Metabolic Diseases, Changsha, China,
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23
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Cuenoud B, Hartweg M, Godin JP, Croteau E, Maltais M, Castellano CA, Carpentier AC, Cunnane SC. Metabolism of Exogenous D-Beta-Hydroxybutyrate, an Energy Substrate Avidly Consumed by the Heart and Kidney. Front Nutr 2020; 7:13. [PMID: 32140471 PMCID: PMC7042179 DOI: 10.3389/fnut.2020.00013] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 01/31/2020] [Indexed: 12/14/2022] Open
Abstract
There is growing interest in the metabolism of ketones owing to their reported benefits in neurological and more recently in cardiovascular and renal diseases. As an alternative to a very high fat ketogenic diet, ketones precursors for oral intake are being developed to achieve ketosis without the need for dietary carbohydrate restriction. Here we report that an oral D-beta-hydroxybutyrate (D-BHB) supplement is rapidly absorbed and metabolized in humans and increases blood ketones to millimolar levels. At the same dose, D-BHB is significantly more ketogenic and provides fewer calories than a racemic mixture of BHB or medium chain triglyceride. In a whole body ketone positron emission tomography pilot study, we observed that after D-BHB consumption, the ketone tracer 11C-acetoacetate is rapidly metabolized, mostly by the heart and the kidneys. Beyond brain energy rescue, this opens additional opportunities for therapeutic exploration of D-BHB supplements as a "super fuel" in cardiac and chronic kidney diseases.
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Affiliation(s)
- Bernard Cuenoud
- Nestlé Health Science, Translation Research, Epalinges, Switzerland
| | - Mickaël Hartweg
- Nestlé Research, Clinical Development Unit, Lausanne, Switzerland
| | - Jean-Philippe Godin
- Nestlé Research, Institute of Food Safety and Analytical Sciences, Lausanne, Switzerland
| | | | - Mathieu Maltais
- Department of Medicine, Université de Sherbrooke, Sherbrooke, QC, Canada.,Research Center on Aging, Sherbrooke, QC, Canada
| | | | - André C Carpentier
- Department of Medicine, Université de Sherbrooke, Sherbrooke, QC, Canada.,CHUS Research Center, Sherbrooke, QC, Canada.,Department of Pharmacology and Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Stephen C Cunnane
- Department of Medicine, Université de Sherbrooke, Sherbrooke, QC, Canada.,Research Center on Aging, Sherbrooke, QC, Canada.,Department of Pharmacology and Physiology, Université de Sherbrooke, Sherbrooke, QC, Canada
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24
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Price NL, Miguel V, Ding W, Singh AK, Malik S, Rotllan N, Moshnikova A, Toczek J, Zeiss C, Sadeghi MM, Arias N, Baldán Á, Andreev OA, Rodríguez-Puyol D, Bahal R, Reshetnyak YK, Suárez Y, Fernández-Hernando C, Lamas S. Genetic deficiency or pharmacological inhibition of miR-33 protects from kidney fibrosis. JCI Insight 2019; 4:131102. [PMID: 31613798 DOI: 10.1172/jci.insight.131102] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 10/10/2019] [Indexed: 12/18/2022] Open
Abstract
Previous work has reported the important links between cellular bioenergetics and the development of chronic kidney disease, highlighting the potential for targeting metabolic functions to regulate disease progression. More recently, it has been shown that alterations in fatty acid oxidation (FAO) can have an important impact on the progression of kidney disease. In this work, we demonstrate that loss of miR-33, an important regulator of lipid metabolism, can partially prevent the repression of FAO in fibrotic kidneys and reduce lipid accumulation. These changes were associated with a dramatic reduction in the extent of fibrosis induced in 2 mouse models of kidney disease. These effects were not related to changes in circulating leukocytes because bone marrow transplants from miR-33-deficient animals did not have a similar impact on disease progression. Most important, targeted delivery of miR-33 peptide nucleic acid inhibitors to the kidney and other acidic microenvironments was accomplished using pH low insertion peptides as a carrier. This was effective at both increasing the expression of factors involved in FAO and reducing the development of fibrosis. Together, these findings suggest that miR-33 may be an attractive therapeutic target for the treatment of chronic kidney disease.
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Affiliation(s)
- Nathan L Price
- Vascular Biology and Therapeutics Program and.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Verónica Miguel
- Department of Cell Biology and Immunology, Centro de Biología Molecular "Severo Ochoa," Madrid, Spain
| | - Wen Ding
- Vascular Biology and Therapeutics Program and.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Abhishek K Singh
- Vascular Biology and Therapeutics Program and.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Shipra Malik
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, USA
| | - Noemi Rotllan
- Vascular Biology and Therapeutics Program and.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Anna Moshnikova
- Department of Physics, University of Rhode Island, Kingston, Rhode Island, USA
| | - Jakub Toczek
- Vascular Biology and Therapeutics Program and.,Cardiovascular Molecular Imaging Laboratory, Section of Cardiovascular Medicine, and Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, Connecticut, USA.,Section of Cardiology, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut, USA
| | - Caroline Zeiss
- Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Mehran M Sadeghi
- Vascular Biology and Therapeutics Program and.,Cardiovascular Molecular Imaging Laboratory, Section of Cardiovascular Medicine, and Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, Connecticut, USA.,Section of Cardiology, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut, USA
| | - Noemi Arias
- Edward A. Doisy Department of Biochemistry and Molecular Biology and Center for Cardiovascular Research, Saint Louis University School of Medicine, St. Louis, Missouri, USA
| | - Ángel Baldán
- Edward A. Doisy Department of Biochemistry and Molecular Biology and Center for Cardiovascular Research, Saint Louis University School of Medicine, St. Louis, Missouri, USA
| | - Oleg A Andreev
- Department of Physics, University of Rhode Island, Kingston, Rhode Island, USA
| | - Diego Rodríguez-Puyol
- Department of Medicine and Medical Specialties, Research Foundation of the University Hospital "Príncipe de Asturias," IRYCIS, Alcalá University, Alcalá de Henares, Madrid, Spain
| | - Raman Bahal
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, USA
| | - Yana K Reshetnyak
- Department of Physics, University of Rhode Island, Kingston, Rhode Island, USA
| | - Yajaira Suárez
- Vascular Biology and Therapeutics Program and.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Carlos Fernández-Hernando
- Vascular Biology and Therapeutics Program and.,Integrative Cell Signaling and Neurobiology of Metabolism Program, Department of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Santiago Lamas
- Department of Cell Biology and Immunology, Centro de Biología Molecular "Severo Ochoa," Madrid, Spain
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25
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Kidney Injury Molecule-1 Is Upregulated in Renal Lipotoxicity and Mediates Palmitate-Induced Tubular Cell Injury and Inflammatory Response. Int J Mol Sci 2019; 20:ijms20143406. [PMID: 31373312 PMCID: PMC6679556 DOI: 10.3390/ijms20143406] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/05/2019] [Accepted: 07/10/2019] [Indexed: 12/20/2022] Open
Abstract
Diabetic nephropathy is increasingly recognized as a major contributor to kidney failure in patients with obesity and type 2 diabetes. This study was designed to identify the molecular mediators of kidney injury associated with metabolic syndrome with or without hyperglycemia. We compared renal gene expression profiles in Zucker lean (ZL), Zucker obese (ZO), and Zucker diabetic (ZD) rats using cDNA microarray with quantitative verification of selected transcripts by real-time PCR. Compared to the 20-week-old ZL control (glucose: 110 ± 8 mg/dL), both prediabetic ZO (glucose: 157 ± 11 mg/dL) and diabetic ZD (glucose: 481 ± 37 mg/dL) rats displayed hyperlipidemia and kidney injury with a high degree of proteinuria. cDNA microarray identified 25 inflammation and injury-related transcriptomes whose expression levels were similarly increased in ZO and ZD kidneys. Among them, kidney injury molecule-1 (KIM-1) was found to be the most highly upregulated in both ZO and ZD kidneys. Immunofluorescence staining of kidney sections revealed a strong correlation between lipid overload and KIM-1 upregulation in proximal tubules of ZO and ZD rats. In cultured primary renal tubular epithelial cells (TECs), administration of saturated fatty acid palmitate resulted in an upregulation of KIM-1, osteopontin, and CD44, which was greatly attenuated by U0126, an inhibitor of extracellular signal-regulated kinase (ERK)1/2. Moreover, knockdown of KIM-1 by siRNA interference inhibited palmitate-induced cleaved caspase-3, osteopontin, and CD44 proteins in primary TECs. Our results indicate that KIM-1 expression is upregulated in renal lipotoxicity and may play an important role in fatty acid-induced inflammation and tubular cell damage in obesity and diabetic kidney disease.
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26
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Bergman HM, Lindfors L, Palm F, Kihlberg J, Lanekoff I. Metabolite aberrations in early diabetes detected in rat kidney using mass spectrometry imaging. Anal Bioanal Chem 2019; 411:2809-2816. [PMID: 30895347 PMCID: PMC6522648 DOI: 10.1007/s00216-019-01721-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 02/12/2019] [Accepted: 02/26/2019] [Indexed: 01/26/2023]
Abstract
Diabetic kidney disease is a serious complication of diabetes that can ultimately lead to end-stage renal disease. The pathogenesis of diabetic kidney disease is complex, and fundamental research is still required to provide a better understanding of the driving forces behind it. We report regional metabolic aberrations from an untargeted mass spectrometry imaging study of kidney tissue using an insulinopenic rat model of diabetes. Diabetes was induced by intravenous injection of streptozotocin, and kidneys were harvested 2 weeks thereafter. Imaging was performed using nanospray desorption electrospray ionization connected to a high-mass-resolving mass spectrometer. No histopathological changes were observed in the kidney sections; however, mass spectrometry imaging revealed a significant increase in several 18-carbon unsaturated non-esterified fatty acid species and monoacylglycerols. Notably, these 18-carbon acyl chains were also constituents of several increased diacylglycerol species. In addition, a number of short- and long-chain acylcarnitines were found to be accumulated while several amino acids were depleted. This study presents unique regional metabolic data indicating a dysregulated energy metabolism in renal mitochondria as an early response to streptozotocin-induced type I diabetes. Graphical abstract.
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Affiliation(s)
| | - Lina Lindfors
- Department of Chemistry-BMC, Uppsala University, Box 599, 751 24, Uppsala, Sweden
| | - Fredrik Palm
- Department of Medical Cell Biology, Uppsala University, Box 571, 751 23, Uppsala, Sweden
| | - Jan Kihlberg
- Department of Chemistry-BMC, Uppsala University, Box 599, 751 24, Uppsala, Sweden
| | - Ingela Lanekoff
- Department of Chemistry-BMC, Uppsala University, Box 599, 751 24, Uppsala, Sweden.
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27
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Nyrén R, Makoveichuk E, Malla S, Kersten S, Nilsson SK, Ericsson M, Olivecrona G. Lipoprotein lipase in mouse kidney: effects of nutritional status and high-fat diet. Am J Physiol Renal Physiol 2019; 316:F558-F571. [PMID: 30698048 DOI: 10.1152/ajprenal.00474.2018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Activity of lipoprotein lipase (LPL) is high in mouse kidney, but the reason is poorly understood. The aim was to characterize localization, regulation, and function of LPL in kidney of C57BL/6J mice. We found LPL mainly in proximal tubules, localized inside the tubular epithelial cells, under all conditions studied. In fed mice, some LPL colocalized with the endothelial markers CD31 and GPIHBP1 and could be removed by perfusion with heparin, indicating a vascular location. The role of angiopoietin-like protein 4 (ANGPTL4) for nutritional modulation of LPL activity was studied in wild-type and Angptl4-/- mice. In Angptl4-/- mice, kidney LPL activity remained high in fasted animals, indicating that ANGPTL4 is involved in suppression of LPL activity on fasting, like in adipose tissue. The amount of ANGPTL4 protein in kidney was low, and the protein appeared smaller in size, compared with ANGPTL4 in heart and adipose tissue. To study the influence of obesity, mice were challenged with high-fat diet for 22 wk, and LPL was studied after an overnight fast compared with fasted mice given food for 3 h. High-fat diet caused blunting of the normal adaptation of LPL activity to feeding/fasting in adipose tissue, but in kidneys this adaptation was lost only in male mice. LPL activity increases to high levels in mouse kidney after feeding, but as no difference in uptake of chylomicron triglycerides in kidneys is found between fasted and fed states, our data confirm that LPL appears to have a minor role for lipid uptake in this organ.
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Affiliation(s)
- Rakel Nyrén
- Department of Medical Biosciences/Physiological Chemistry, Umeå University , Umeå , Sweden
| | - Elena Makoveichuk
- Department of Medical Biosciences/Physiological Chemistry, Umeå University , Umeå , Sweden
| | - Sandhya Malla
- Department of Medical Biosciences/Physiological Chemistry, Umeå University , Umeå , Sweden.,Wallenberg Center for Molecular Medicine, Umeå University , Umeå , Sweden
| | - Sander Kersten
- Nutrition, Metabolism, and Genomics Group, Division of Human Nutrition and Health, Wageningen University , Wageningen , The Netherlands
| | - Stefan K Nilsson
- Department of Medical Biosciences/Physiological Chemistry, Umeå University , Umeå , Sweden
| | - Madelene Ericsson
- Department of Medical Biosciences/Physiological Chemistry, Umeå University , Umeå , Sweden
| | - Gunilla Olivecrona
- Department of Medical Biosciences/Physiological Chemistry, Umeå University , Umeå , Sweden
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28
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Willmes DM, Kurzbach A, Henke C, Schumann T, Zahn G, Heifetz A, Jordan J, Helfand SL, Birkenfeld AL. The longevity gene INDY ( I 'm N ot D ead Y et) in metabolic control: Potential as pharmacological target. Pharmacol Ther 2018; 185:1-11. [DOI: 10.1016/j.pharmthera.2017.10.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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29
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Su H, Wan C, Lei CT, Zhang CY, Ye C, Tang H, Qiu Y, Zhang C. Lipid Deposition in Kidney Diseases: Interplay Among Redox, Lipid Mediators, and Renal Impairment. Antioxid Redox Signal 2018; 28:1027-1043. [PMID: 28325081 DOI: 10.1089/ars.2017.7066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Significance: The relationship between lipid disturbances and renal diseases has been studied for several decades, and it is well recognized that when the balance of renal lipid uptake, synthesis, oxidation, and outflow is disrupted, lipids will undergo oxidation, be sequestrated as lipid droplets, generate toxic metabolites, and cause nephrotoxicity in diverse renal diseases. Recent Advances: During renal disorders, redox signaling is a pivotal event promoting or resulting from lipid disorders. Accordingly, a vicious cycle of lipid redox dysregulation could be developed, accelerating the renal damage. Critical Issues: The aim of this concise review is to introduce the connection among redox, lipid abnormalities and kidney damage in various conditions. And we summarized current understanding of the lipid redox loop implicated in acute kidney injury, chronic kidney disease, metabolic abnormalities, aging, and genetic pitfalls. Future Directions: Despite recent advances, further investigations are required to clarify the complicated molecular and regulatory mechanisms among redox, lipid mediators and renal disorders. Moreover, exploring an ideal target for potential therapies should be discussed and studied in future. Antioxid. Redox Signal. 28, 1027-1043.
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Affiliation(s)
- Hua Su
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Cheng Wan
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chun-Tao Lei
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chun-Yun Zhang
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chen Ye
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui Tang
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yue Qiu
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chun Zhang
- Department of Nephrology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Wang L, Liu Z, Chen Z, Huang C, Liu X, Chen C, Liu X, Huang J, Liu L, Lin D. Metabonomic analysis of the therapeutic effect of exendin-4 for the treatment of tBHP-induced injury in mouse glomerulus mesangial cells. Free Radic Res 2018. [PMID: 29526117 DOI: 10.1080/10715762.2018.1449948] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Although previous studies have reported the protective effect of glucagon-like peptide-1 (GLP-1) in diabetes nephropathy, the molecular mechanism such as nephroprotection remains elusive. In this study, we explored the molecular mechanism of exendin-4 as an GLP-1 receptor agonist for the treatment of tert-butyl hydroperoxide (t-BHP)-induced injury in mouse glomerulus mesangial cells (SV40 MES 13 cells) via an NMR-based metabonomic analysis. We found that exendin-4 protected mesangial cells from t-BHP-mediated toxicity, decreased the percentage of t-BHP-treated cells undergoing apoptosis, and restored glucose consumption in the t-BHP-treated group. A supervised partial least-squares discriminant analysis (PLS-DA) revealed that the metabolic profiles could be distinguished between the control, t-BHP-treated, and exendin-4-pretreated groups. Our findings indicate that exendin-4 pretreatment can cause distinct changes in energy, glycerol phospholipid, and amino acid metabolism. Our study provides novel insight into the metabolic mechanism of exendin-4-mediated nephroprotective effects.
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Affiliation(s)
- Linxi Wang
- a Department of Endocrinology and Metabolism, Department of Geriatrics , Fujian Institute of Endocrinology, Fujian Medical University Union Hospital , Fuzhou , China
| | - Zhiqing Liu
- b Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , China
| | - Zhou Chen
- c Department of Pharmacology, College of Pharmacy , Fujian Medical University , Fuzhou , China
| | - Caihua Huang
- d Exercise and Health Laboratory , Xiamen University of Technology , Xiamen , China
| | - Xiaohong Liu
- a Department of Endocrinology and Metabolism, Department of Geriatrics , Fujian Institute of Endocrinology, Fujian Medical University Union Hospital , Fuzhou , China
| | - Can Chen
- a Department of Endocrinology and Metabolism, Department of Geriatrics , Fujian Institute of Endocrinology, Fujian Medical University Union Hospital , Fuzhou , China
| | - Xiaoyin Liu
- a Department of Endocrinology and Metabolism, Department of Geriatrics , Fujian Institute of Endocrinology, Fujian Medical University Union Hospital , Fuzhou , China
| | - Jingze Huang
- a Department of Endocrinology and Metabolism, Department of Geriatrics , Fujian Institute of Endocrinology, Fujian Medical University Union Hospital , Fuzhou , China
| | - Libin Liu
- a Department of Endocrinology and Metabolism, Department of Geriatrics , Fujian Institute of Endocrinology, Fujian Medical University Union Hospital , Fuzhou , China
| | - Donghai Lin
- b Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , China
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Dekkers IA, de Heer P, Bizino MB, de Vries APJ, Lamb HJ. 1 H-MRS for the assessment of renal triglyceride content in humans at 3T: A primer and reproducibility study. J Magn Reson Imaging 2018. [PMID: 29517830 DOI: 10.1002/jmri.26003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Renal steatosis (fatty kidney) is a potential biomarker for obesity-related renal disease; however, noninvasive assessment of renal fat content remains a technical challenge. PURPOSE To evaluate reproducibility and explore clinical application of renal metabolic imaging for the quantification of renal triglyceride content (TG) using proton magnetic resonance spectroscopy (1 H-MRS). STUDY TYPE Reproducibility and clinical cohort study. POPULATION Twenty-three healthy volunteers (mean age 30.1 ± 13.4 years) and 15 patients with type 2 diabetes mellitus (T2DM) (mean age 59.3 ± 7.0 years). FIELD STRENGTH/SEQUENCE 3T, single-voxel point resolved spectroscopy (PRESS). ASSESSMENT Intra- and interexamination reproducibility of renal TG was assessed in healthy volunteers, and compared to T2DM patients. Intraexamination differences were obtained by repeating the 1 H-MRS measurement directly after the first 1 H-MRS without repositioning of the subject or changing surface coil and measurement volumes. Interexamination variability was studied by repeating the scan protocol after removal and replacement of the subject in the magnet, and subsequent repositioning of body coil and measurement volumes. STATISTICAL TESTS Reproducibility was determined using Pearson's correlation and Bland-Altman analyses. Differences in TG% between healthy volunteers and T2DM patients were assessed using the Mann-Whitney U-test. RESULTS After logarithmic (log) transformation, both intraexamination (r = 0.91, n = 19) and interexamination (r = 0.73, n = 9) measurements of renal TG content were highly correlated with the first renal TG measurements. Intraexamination and interexamination limits of agreement of renal log TG% were respectively [-1.36%, + 0.84%] and [-0.77%, + 0.62%]. Backtransformed limits of agreement were [-0.89%,+0.57%] and [-0.55%, + 0.43%] multiplied by mean TG for intra- and interexamination measurements. Overall median renal TG content was 0.12% [0.08, 0.22; 25th percentile, 75th percentile] in healthy volunteers and 0.20% [0.13, 0.22] in T2DM patients (P = 0.08). DATA CONCLUSION Renal metabolic imaging using 3T 1 H-MRS is a reproducible technique for the assessment of renal triglyceride content. LEVEL OF EVIDENCE 3 Technical Efficacy: Stage 1 J. MAGN. RESON. IMAGING 2018;48:507-513.
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Affiliation(s)
- Ilona A Dekkers
- Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Paul de Heer
- Department of Radiology and Nuclear Medicine, Academic Medical Center, Amsterdam, the Netherlands
| | - Maurice B Bizino
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, the Netherlands
| | - Aiko P J de Vries
- Department of Medicine, Division of Nephrology and Transplant Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Hildo J Lamb
- Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
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Abstract
Globally, diabetes is the leading cause of chronic kidney disease and end-stage renal disease, which are major risk factors for cardiovascular disease and death. Despite this burden, the factors that precipitate the development and progression of diabetic kidney disease (DKD) remain to be fully elucidated. Mitochondrial dysfunction is associated with kidney disease in nondiabetic contexts, and increasing evidence suggests that dysfunctional renal mitochondria are pathological mediators of DKD. These complex organelles have a broad range of functions, including the generation of ATP. The kidneys are mitochondrially rich, highly metabolic organs that require vast amounts of ATP for their normal function. The delivery of metabolic substrates for ATP production, such as fatty acids and oxygen, is altered by diabetes. Changes in metabolic fuel sources in diabetes to meet ATP demands result in increased oxygen consumption, which contributes to renal hypoxia. Inherited factors including mutations in genes that impact mitochondrial function and/or substrate delivery may also be important risk factors for DKD. Hence, we postulate that the diabetic milieu and inherited factors that underlie abnormalities in mitochondrial function synergistically drive the development and progression of DKD.
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Affiliation(s)
- Josephine M Forbes
- Glycation and Diabetes Group, Mater Research Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia.,Mater Clinical School, School of Medicine, The University of Queensland, St Lucia, Queensland, Australia.,Departments of Medicine and Paediatrics, The University of Melbourne, Parkville, Victoria, Australia
| | - David R Thorburn
- Departments of Medicine and Paediatrics, The University of Melbourne, Parkville, Victoria, Australia.,Murdoch Children's Research Institute, Royal Children's Hospital, Parkville, Victoria, Australia
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Khan S, Cabral PD, Schilling WP, Schmidt ZW, Uddin AN, Gingras A, Madhavan SM, Garvin JL, Schelling JR. Kidney Proximal Tubule Lipoapoptosis Is Regulated by Fatty Acid Transporter-2 (FATP2). J Am Soc Nephrol 2017; 29:81-91. [PMID: 28993506 DOI: 10.1681/asn.2017030314] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 08/08/2017] [Indexed: 11/03/2022] Open
Abstract
Albuminuria and tubular atrophy are among the highest risks for CKD progression to ESRD. A parsimonious mechanism involves leakage of albumin-bound nonesterified fatty acids (NEFAs) across the damaged glomerular filtration barrier and subsequent reabsorption by the downstream proximal tubule, causing lipoapoptosis. We sought to identify the apical proximal tubule transporter that mediates NEFA uptake and cytotoxicity. We observed transporter-mediated uptake of fluorescently labeled NEFA in cultured proximal tubule cells and microperfused rat proximal tubules, with greater uptake from the apical surface than from the basolateral surface. Protein and mRNA expression analyses revealed that kidney proximal tubules express transmembrane fatty acid transporter-2 (FATP2), encoded by Slc27a2, but not the other candidate transporters CD36 and free fatty acid receptor 1. Kidney FATP2 localized exclusively to proximal tubule epithelial cells along the apical but not the basolateral membrane. Treatment of mice with lipidated albumin to induce proteinuria caused a decrease in the proportion of tubular epithelial cells and an increase in the proportion of interstitial space in kidneys from wild-type but not Slc27a2-/- mice. Ex vivo microperfusion and in vitro experiments with NEFA-bound albumin at concentrations that mimic apical proximal tubule exposure during glomerular injury revealed significantly reduced NEFA uptake and palmitate-induced apoptosis in microperfused Slc27a2-/- proximal tubules and Slc27a2-/- or FATP2 shRNA-treated proximal tubule cell lines compared with wild-type or scrambled oligonucleotide-treated cells, respectively. We conclude that FATP2 is a major apical proximal tubule NEFA transporter that regulates lipoapoptosis and may be an amenable target for the prevention of CKD progression.
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Affiliation(s)
- Shenaz Khan
- Department of Medicine, The MetroHealth System and
| | - Pablo D Cabral
- Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio
| | - William P Schilling
- Department of Medicine, The MetroHealth System and.,Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio
| | | | - Asif N Uddin
- Department of Medicine, The MetroHealth System and
| | | | | | - Jeffrey L Garvin
- Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio
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CD36 in chronic kidney disease: novel insights and therapeutic opportunities. Nat Rev Nephrol 2017; 13:769-781. [DOI: 10.1038/nrneph.2017.126] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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35
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Scerbo D, Son NH, Sirwi A, Zeng L, Sas KM, Cifarelli V, Schoiswohl G, Huggins LA, Gumaste N, Hu Y, Pennathur S, Abumrad NA, Kershaw EE, Hussain MM, Susztak K, Goldberg IJ. Kidney triglyceride accumulation in the fasted mouse is dependent upon serum free fatty acids. J Lipid Res 2017; 58:1132-1142. [PMID: 28404638 DOI: 10.1194/jlr.m074427] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 04/10/2017] [Indexed: 01/13/2023] Open
Abstract
Lipid accumulation is a pathological feature of every type of kidney injury. Despite this striking histological feature, physiological accumulation of lipids in the kidney is poorly understood. We studied whether the accumulation of lipids in the fasted kidney are derived from lipoproteins or NEFAs. With overnight fasting, kidneys accumulated triglyceride, but had reduced levels of ceramide and glycosphingolipid species. Fasting led to a nearly 5-fold increase in kidney uptake of plasma [14C]oleic acid. Increasing circulating NEFAs using a β adrenergic receptor agonist caused a 15-fold greater accumulation of lipid in the kidney, while mice with reduced NEFAs due to adipose tissue deficiency of adipose triglyceride lipase had reduced triglycerides. Cluster of differentiation (Cd)36 mRNA increased 2-fold, and angiopoietin-like 4 (Angptl4), an LPL inhibitor, increased 10-fold. Fasting-induced kidney lipid accumulation was not affected by inhibition of LPL with poloxamer 407 or by use of mice with induced genetic LPL deletion. Despite the increase in CD36 expression with fasting, genetic loss of CD36 did not alter fatty acid uptake or triglyceride accumulation. Our data demonstrate that fasting-induced triglyceride accumulation in the kidney correlates with the plasma concentrations of NEFAs, but is not due to uptake of lipoprotein lipids and does not involve the fatty acid transporter, CD36.
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Affiliation(s)
- Diego Scerbo
- Division of Endocrinology, Diabetes, and Metabolism, New York University School of Medicine, New York, NY.,Institute of Human Nutrition, Columbia University, New York, NY
| | - Ni-Huiping Son
- Division of Endocrinology, Diabetes, and Metabolism, New York University School of Medicine, New York, NY
| | - Alaa Sirwi
- Department of Cell Biology, State University of New York Downstate Medical Center, Brooklyn, NY
| | - Lixia Zeng
- Division of Nephrology, University of Michigan, Ann Arbor, MI
| | - Kelli M Sas
- Division of Nephrology, University of Michigan, Ann Arbor, MI
| | | | - Gabriele Schoiswohl
- Division of Endocrinology, University of Pittsburgh, Pittsburgh, PA.,Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Lesley-Ann Huggins
- Division of Endocrinology, Diabetes, and Metabolism, New York University School of Medicine, New York, NY
| | - Namrata Gumaste
- Division of Endocrinology, Diabetes, and Metabolism, New York University School of Medicine, New York, NY
| | - Yunying Hu
- Division of Endocrinology, Diabetes, and Metabolism, New York University School of Medicine, New York, NY
| | | | - Nada A Abumrad
- Department of Medicine, Washington University, St. Louis, MO
| | - Erin E Kershaw
- Division of Endocrinology, University of Pittsburgh, Pittsburgh, PA
| | - M Mahmood Hussain
- Department of Cell Biology, State University of New York Downstate Medical Center, Brooklyn, NY
| | - Katalin Susztak
- Division of Renal Electrolyte and Hypertension, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Ira J Goldberg
- Division of Endocrinology, Diabetes, and Metabolism, New York University School of Medicine, New York, NY
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Pecoits-Filho R, Abensur H, Betônico CCR, Machado AD, Parente EB, Queiroz M, Salles JEN, Titan S, Vencio S. Interactions between kidney disease and diabetes: dangerous liaisons. Diabetol Metab Syndr 2016; 8:50. [PMID: 27471550 PMCID: PMC4964290 DOI: 10.1186/s13098-016-0159-z] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 07/10/2016] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Type 2 diabetes mellitus (DM) globally affects 18-20 % of adults over the age of 65 years. Diabetic kidney disease (DKD) is one of the most frequent and dangerous complications of DM2, affecting about one-third of the patients with DM2. In addition to the pancreas, adipocytes, liver, and intestines, the kidneys also play an important role in glycemic control, particularly due to renal contribution to gluconeogenesis and tubular reabsorption of glucose. METHODS In this review article, based on a report of discussions from an interdisciplinary group of experts in the areas of endocrinology, diabetology and nephrology, we detail the relationship between diabetes and kidney disease, addressing the care in the diagnosis, the difficulties in achieving glycemic control and possible treatments that can be applied according to the different degrees of impairment. DISCUSSION Glucose homeostasis is extremely altered in patients with DKD, who are exposed to a high risk of both hyperglycemia and hypoglycemia. Both high and low glycemic levels are associated with increased morbidity and shortened survival in this group of patients. Factors that are associated with an increased risk of hypoglycemia in DKD patients include decreased renal gluconeogenesis, deranged metabolic pathways (including altered metabolism of medications) and decreased insulin clearance. On the other hand, decrease glucose filtration and excretion, and inflammation-induce insulin resistance are predisposing factors to hyperglycemic episodes. CONCLUSION Appropriate glycaemic monitoring and control tailored for diabetic patients is required to avoid hypoglycaemia and other glycaemic disarrays in patients with DM2 and kidney disease. Understanding the renal physiology and pathophysiology of DKD has become essential to all specialties treating diabetic patients. Disseminating this knowledge and detailing the evidence will be important to initiate breakthrough research and to encourage proper treatment of this group of patients.
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Affiliation(s)
- Roberto Pecoits-Filho
- School of Medicine, Pontificia Universidade Católica do Paraná, Imaculada Conceição, 1155, Curitiba, PR 80215-901 Brazil
| | - Hugo Abensur
- School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Carolina C. R. Betônico
- Hospital Regional de Presidente Prudente, Universidade do Oeste Paulista, Presidente Prudente, São Paulo, Brazil
| | | | | | - Márcia Queiroz
- School of Medicine, University of São Paulo, São Paulo, Brazil
| | | | - Silvia Titan
- School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Sergio Vencio
- Institute of Pharmaceutical Sciences, Goiania, Brazil
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Obesity-related glomerulopathy: clinical and pathologic characteristics and pathogenesis. Nat Rev Nephrol 2016; 12:453-71. [PMID: 27263398 DOI: 10.1038/nrneph.2016.75] [Citation(s) in RCA: 432] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The prevalence of obesity-related glomerulopathy is increasing in parallel with the worldwide obesity epidemic. Glomerular hypertrophy and adaptive focal segmental glomerulosclerosis define the condition pathologically. The glomerulus enlarges in response to obesity-induced increases in glomerular filtration rate, renal plasma flow, filtration fraction and tubular sodium reabsorption. Normal insulin/phosphatidylinositol 3-kinase/Akt and mTOR signalling are critical for podocyte hypertrophy and adaptation. Adipokines and ectopic lipid accumulation in the kidney promote insulin resistance of podocytes and maladaptive responses to cope with the mechanical forces of renal hyperfiltration. Although most patients have stable or slowly progressive proteinuria, up to one-third develop progressive renal failure and end-stage renal disease. Renin-angiotensin-aldosterone blockade is effective in the short-term but weight loss by hypocaloric diet or bariatric surgery has induced more consistent and dramatic antiproteinuric effects and reversal of hyperfiltration. Altered fatty acid and cholesterol metabolism are increasingly recognized as key mediators of renal lipid accumulation, inflammation, oxidative stress and fibrosis. Newer therapies directed to lipid metabolism, including SREBP antagonists, PPARα agonists, FXR and TGR5 agonists, and LXR agonists, hold therapeutic promise.
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Obesity-Related Chronic Kidney Disease-The Role of Lipid Metabolism. Metabolites 2015; 5:720-32. [PMID: 26690487 PMCID: PMC4693192 DOI: 10.3390/metabo5040720] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 12/01/2015] [Accepted: 12/08/2015] [Indexed: 02/06/2023] Open
Abstract
Obesity is an independent risk factor for chronic kidney disease (CKD). The mechanisms linking obesity and CKD include systemic changes such as high blood pressure and hyperglycemia, and intrarenal effects relating to lipid accumulation. Normal lipid metabolism is integral to renal physiology and disturbances of renal lipid and energy metabolism are increasingly being linked with kidney disease. AMP-activated protein kinase (AMPK) and acetyl-CoA carboxylase (ACC) are important regulators of fatty acid oxidation, which is frequently abnormal in the kidney with CKD. A high fat diet reduces renal AMPK activity, thereby contributing to reduced fatty acid oxidation and energy imbalance, and treatments to activate AMPK are beneficial in animal models of obesity-related CKD. Studies have found that the specific cell types affected by excessive lipid accumulation are proximal tubular cells, podocytes, and mesangial cells. Targeting disturbances of renal energy metabolism is a promising approach to addressing the current epidemic of obesity-related kidney disease.
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Abstract
Although diabetes is mainly diagnosed based on elevated glucose levels, dyslipidemia is also observed in these patients. Chronic kidney disease (CKD), a frequent occurrence in patients with diabetes, is associated with major abnormalities in circulating lipoproteins and renal lipid metabolism. At baseline, most renal epithelial cells rely on fatty acids as their energy source. CKD, including that which occurs in diabetes, is characterized by tubule epithelial lipid accumulation. Whether this is due to increased uptake or greater local fatty acid synthesis is unknown. We have recently shown that CKD also leads to decreased fatty acid oxidation, which might be an additional mechanism leading to lipid accumulation. Defective fatty acid utilization causes energy depletion resulting in increased apoptosis and dedifferentiation, which in turn contributes to fibrosis and CKD progression. Enhanced fatty acid oxidation in the kidney induced by fenofibrate, a peroxisomal proliferator-activated receptor (PPAR)-α agonist, showed benefit in mouse models of CKD. Fenofibrate treatment also reduced albuminuria in patients with diabetes in multiple clinical trials. Taken together, these findings suggest that further understanding of lipid metabolism in diabetic kidney disease may lead to novel therapeutic approaches.
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Affiliation(s)
- Krisztian Stadler
- Oxidative Stress and Disease Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, USA
| | - Ira J. Goldberg
- Division of Endocrinology, Diabetes, and Metabolism, New York University School of Medicine, New York, NY, USA
| | - Katalin Susztak
- Division of Nephrology, Perelman School of Medicine, University of Pennsylvania, 405 Clinical Research Building, 415 CRB, 415 Curie Blvd, Philadelphia, PA 19104, USA
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40
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Han SH, Malaga-Dieguez L, Chinga F, Kang HM, Tao J, Reidy K, Susztak K. Deletion of Lkb1 in Renal Tubular Epithelial Cells Leads to CKD by Altering Metabolism. J Am Soc Nephrol 2015; 27:439-53. [PMID: 26054542 DOI: 10.1681/asn.2014121181] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 04/12/2015] [Indexed: 12/30/2022] Open
Abstract
Renal tubule epithelial cells are high-energy demanding polarized epithelial cells. Liver kinase B1 (LKB1) is a key regulator of polarity, proliferation, and cell metabolism in epithelial cells, but the function of LKB1 in the kidney is unclear. Our unbiased gene expression studies of human control and CKD kidney samples identified lower expression of LKB1 and regulatory proteins in CKD. Mice with distal tubule epithelial-specific Lkb1 deletion (Ksp-Cre/Lkb1(flox/flox)) exhibited progressive kidney disease characterized by flattened dedifferentiated tubule epithelial cells, interstitial matrix accumulation, and dilated cystic-appearing tubules. Expression of epithelial polarity markers β-catenin and E-cadherin was not altered even at later stages. However, expression levels of key regulators of metabolism, AMP-activated protein kinase (Ampk), peroxisome proliferative activated receptor gamma coactivator 1-α (Ppargc1a), and Ppara, were significantly lower than those in controls and correlated with fibrosis development. Loss of Lkb1 in cultured epithelial cells resulted in energy depletion, apoptosis, less fatty acid oxidation and glycolysis, and a profibrotic phenotype. Treatment of Lkb1-deficient cells with an AMP-activated protein kinase (AMPK) agonist (A769662) or a peroxisome proliferative activated receptor alpha agonist (fenofibrate) restored the fatty oxidation defect and reduced apoptosis. In conclusion, we show that loss of LKB1 in renal tubular epithelial cells has an important role in kidney disease development by influencing intracellular metabolism.
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Affiliation(s)
- Seung Hyeok Han
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Laura Malaga-Dieguez
- 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
| | - Hyun Mi Kang
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Jianling Tao
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Division of Nephrology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Kimberly Reidy
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Children's Hospital at Montefiore, Albert Einstein College of Medicine, Bronx, New York; and
| | - Katalin Susztak
- Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;
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Marvyn PM, Bradley RM, Button EB, Mardian EB, Duncan RE. Fasting upregulates adipose triglyceride lipase and hormone-sensitive lipase levels and phosphorylation in mouse kidney. Biochem Cell Biol 2015; 93:262-7. [PMID: 25879679 DOI: 10.1139/bcb-2014-0150] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Circulating non-esterified fatty acids (NEFA) rise during fasting and are taken up by the kidneys, either directly from the plasma or during re-uptake of albumin from glomerular filtrate, and are stored as triacylglycerol (TAG). Subsequent utilization of stored fatty acids requires their hydrolytic release from cellular lipid droplets, but relatively little is known about renal lipolysis. We found that total [(3)H]triolein hydrolase activity of kidney lysates was significantly increased by 15% in the fasted state. Adipose triglyceride lipase (Atgl) and hormone-sensitive lipase (Hsl) mRNA expression was time-dependently increased by fasting, along with other fatty acid metabolism genes (Pparα, Cd36, and Aox). ATGL and HSL protein levels were also significantly induced (by 239 ± 7% and 322 ± 8%, respectively). Concomitant with changes in total protein levels, there was an increase in ATGL phosphorylation at the AMPK-regulated serine 406 site in the 14-3-3 binding motif, and an increase in HSL phosphorylation at serines 565 and 660 that are regulated by AMPK and PKA, respectively. Using immunofluorescence, we further demonstrate nearly ubiquitous expression of ATGL in the renal cortex with a concentration on the apical/lumenal surface of some cortical tubules. Our findings suggest a role for ATGL and HSL in kidney lipolysis.
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Affiliation(s)
- Phillip M Marvyn
- University of Waterloo, Department of Kinesiology, Faculty of Applied Health Sciences, 200 University Avenue W., BMH 1110, Waterloo, ON N2L 3G1, Canada
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de Vries APJ, Ruggenenti P, Ruan XZ, Praga M, Cruzado JM, Bajema IM, D'Agati VD, Lamb HJ, Pongrac Barlovic D, Hojs R, Abbate M, Rodriquez R, Mogensen CE, Porrini E. Fatty kidney: emerging role of ectopic lipid in obesity-related renal disease. Lancet Diabetes Endocrinol 2014; 2:417-26. [PMID: 24795255 DOI: 10.1016/s2213-8587(14)70065-8] [Citation(s) in RCA: 320] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The global increase in chronic kidney disease (CKD) parallels the obesity epidemic. Obesity conveys a gradual but independent risk of progression of CKD that seems irrespective of the underlying nephropathy. Obesity has been associated with a secondary focal segmental glomerulosclerosis coined obesity-related glomerulopathy (ORG). Pathways through which obesity might cause renal disease are not well understood, and early clinical biomarkers for incipient ORG or renal relevant obesity are currently lacking. Recent human and experimental studies have associated ectopic lipid accumulation in the kidney (fatty kidney) with obesity-related renal disease. There is enough growing insight that ectopic lipid--the accumulation of lipid in non-adipose tissue--is associated with structural and functional changes of mesangial cells, podocytes, and proximal tubular cells to propose the development of ORG as a maladaptive response to hyperfiltration and albuminuria. Recent advances in metabolic imaging might validate ectopic lipid as a biomarker and research aid, to help translate novel therapeutics from experimental models to patients.
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Affiliation(s)
- Aiko P J de Vries
- Department of Nephrology, Leiden University Medical Center and Leiden University, Leiden, Netherlands.
| | - Piero Ruggenenti
- IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Clinical Research Center for Rare Diseases "Aldo e Cele Daccò", Ranica, Bergamo, Italy; Unit of Nephrology and Dialysis, Azienda Ospedaliera Papa Giovanni XXIII, Bergamo, Italy
| | - Xiong Z Ruan
- Moorhead Renal Research Laboratory, University College London, Royal Free Campus, London, UK; Centre for Nephrology and Urology, Shenzhen University Health Science Centre, Shenzhen, China
| | - Manuel Praga
- Departments of Nephrology and Medicine, Hospital 12 de Octubre, Complutense University, Madrid, Spain
| | - Josep M Cruzado
- Department of Nephrology, Hospital Universitario de Bellvitge, Barcelona, Spain
| | - Ingeborg M Bajema
- Department of Pathology, Leiden University Medical Center and Leiden University, Leiden, Netherlands
| | - Vivette D D'Agati
- Department of Pathology, Columbia University Medical Center, New York, NY, USA
| | - Hildo J Lamb
- Department of Radiology, Leiden University Medical Center and Leiden University, Leiden, Netherlands
| | - Drazenka Pongrac Barlovic
- Department of Endocrinology, Diabetes and Metabolism, Ljubljana University Medical Center, Ljubljana, Slovenia
| | - Radovan Hojs
- Department of Nephrology, Clinic for Internal Medicine, University Clinical Centre and Faculty of Medicine, University of Maribor, Maribor, Slovenia
| | - Manuela Abbate
- IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Clinical Research Center for Rare Diseases "Aldo e Cele Daccò", Ranica, Bergamo, Italy
| | - Rosa Rodriquez
- Department of Pathology, Hospital Universitario de Canarias, Tenerife
| | | | - Esteban Porrini
- Center for Biomedical Research of the Canary Islands (CIBICAN), University of La Laguna, Tenerife, Spain
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Willmes DM, Birkenfeld AL. The Role of INDY in Metabolic Regulation. Comput Struct Biotechnol J 2013; 6:e201303020. [PMID: 24688728 PMCID: PMC3962103 DOI: 10.5936/csbj.201303020] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 12/02/2013] [Accepted: 12/02/2013] [Indexed: 01/20/2023] Open
Abstract
Reduced expression of the Indy (I'm Not Dead Yet) gene in D. melanogaster and C. elegans extends longevity. Indy and its mammalian homolog mINDY (Slc13a5, NaCT) are transporters of TCA cycle intermediates, mainly handling the uptake of citrate via the plasma membrane into the cytosol. Deletion of mINDY in mice leads to significant metabolic changes akin to caloric restriction, likely caused by reducing the effects of mINDY-imported citrate on fatty acid and cholesterol synthesis, glucose metabolism and ß-oxidation. This review will provide an overview on different mammalian SLC1 3 family members with a focus on mINDY (SLCl3A5) in glucose and energy metabolism and will highlight the role of mINDY as a putative therapeutic target for the treatment of obesity, non-alcoholic fatty liver disease and type 2 diabetes.
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Affiliation(s)
- Diana M Willmes
- Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité - University School of Medicine, Berlin, Germany
| | - Andreas L Birkenfeld
- Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité - University School of Medicine, Berlin, Germany
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Metabolic signaling by lactate in the brain. Trends Neurosci 2013; 36:396-404. [DOI: 10.1016/j.tins.2013.04.002] [Citation(s) in RCA: 220] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/31/2013] [Accepted: 04/01/2013] [Indexed: 01/27/2023]
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Faiz H, Conjard-Duplany A, Boghossian M, Martin G, Baverel G, Ferrier B. Cadmium chloride inhibits lactate gluconeogenesis in isolated human renal proximal tubules: a cellular metabolomic approach with 13C-NMR. Arch Toxicol 2010; 85:1067-77. [DOI: 10.1007/s00204-010-0633-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Accepted: 11/24/2010] [Indexed: 01/18/2023]
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Abstract
PURPOSE OF REVIEW Lipid accumulation in nonadipose tissues is increasingly recognized to contribute to organ injury through a process termed lipotoxicity, but whether this process occurs in the kidney is still uncertain. This article briefly summarizes the normal role of lipids in renal physiology and the current evidence linking excess lipids and lipotoxicity to renal dysfunction. RECENT FINDINGS Evidence suggesting that renal lipid accumulation and lipotoxicity may lead to kidney dysfunction has mounted significantly over recent years. Abnormal renal lipid content has been described in a number of animal models and has been successfully manipulated using pharmacologic or genetic strategies. There is some heterogeneity among studies with regard to the mechanisms, consequences, and localization of lipid accumulation in the kidney, explainable at least in part by inherent differences between animal models. The relevance of these findings for human pathophysiology remains to be established. SUMMARY Current knowledge on renal lipid physiology and pathophysiology is insufficient, but provides a strong foundation and incentive for further exploration. The future holds significant challenges in this area, especially with regard to applicability of research findings to the human kidney in vivo, but also the opportunity to transform our understanding of an array of kidney disorders.
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Affiliation(s)
- Ion Alexandru Bobulescu
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 775390-8885, USA.
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Abstract
Plasma citrate was determined in 12 obese subjects who underwent total fasting for 10 days. Mean plasma citrate concentration rose significantly from 128 before to 205 micro mol/1 on the 10th day of fasting. Plasma citrate rose continuously during fasting in seven subjects in whom daily determinations were carried out. The 24-hour urinary citrate excretion was followed in six subjects. A significant decrease was found from 2.91 mmol/24 h in the prefasting state to 0.25 mmol/24 h at the end of the fast. Intravenous glucose tolerance test were performed before and on the 10th day of fasting. Kivgtt decreased significantly and was inversely related to plasma citrate concentration on the 10th day of fasting. The results agree well with the concept that an increased citrate level of tissues is of regulatory importance for the decreased glucose utilization during fasting in man.
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Connor H, Woods HF. Quantitative aspects of L(+)-lactate metabolism in human beings. CIBA FOUNDATION SYMPOSIUM 2008; 87:214-34. [PMID: 7042240 DOI: 10.1002/9780470720691.ch12] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The production rate of endogenous L(+)-lactate in the resting human being can be calculated from results of experiments during which isotopic or unlabelled lactate is infused. The merits of the different experimental techniques are discussed, although all published methods have given similar results, namely a resting production rate of about 1.3 mol . (70 kg body wt)-1 . 24 h-1. This result is similar to that found in sheep, but lower than that in dogs and rats. L(+)-lactate production in human subjects is unchanged after fasting for 36-168 h, a finding which contrasts with some animal experiments. It is not known whether this represents a true species difference or a difference in diet. Net splanchnic uptake of L(+)-lactate in the resting human being is about 0.4 mol 24 h-1 although the normal liver has the capacity to metabolize more than this. The kidney is an important site of L(+)-lactate utilization in rats, but there is no information about its role in normal human beings. There are conflicting reports concerning the uptake of L(+)-lactate by resting skeletal muscle, but there is no evidence that resting muscle can metabolize lactate.
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Weerachayaphorn J, Pajor AM. Threonine-509 is a determinant of apparent affinity for both substrate and cations in the human Na+/dicarboxylate cotransporter. Biochemistry 2007; 47:1087-93. [PMID: 18161988 DOI: 10.1021/bi701417h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The Na+/dicarboxylate cotransporter (NaDC1) is involved in the absorption of citric acid cycle intermediates from the lumen of the renal proximal tubule and small intestine. The NaDC1 orthologues from human (h) and rabbit (rb) exhibit differences in citrate and cation transport properties. The citrate Km and sodium KNa values are much larger in human than rabbit NaDC1. Our previous study showed that transmembrane helices (TM) 7, 10, and 11 and associated loop regions contain the amino acids that are important in determining the differences in apparent citrate affinity, whereas TM10 and 11 determine differences in apparent sodium affinity. Chimera R10 (hNaDC1 with a substitution of TM10 and associated loop from rbNaDC1) contains only four amino acid differences between rb and hNaDC1. This chimera has similar apparent affinity for succinate and sodium as the wild-type rbNaDC1, and an intermediate Km for citrate. To identify individual residues in the TM10 region that determine functional differences between rb and hNaDC1, four mutants were made in which the rabbit sequence was substituted for that of the hNaDC1. Mutants with a serine or threonine at position 509 (or 512 in rbNaDC1) in TM10 have partial changes in Km for citrate and succinate but larger changes in apparent affinity for cations and substrate specificity for four-carbon dicarboxylates. The results show that the serine or threonine at position 509 (h) or 512 (rb) is the most important determinant of functional differences in apparent affinity for substrate and cations. Furthermore, the results suggest that the cation and substrate binding sites are located in close proximity to one another in NaDC1.
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Affiliation(s)
- Jittima Weerachayaphorn
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555-0645, USA
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Shohet RV, Garcia JA. Keeping the engine primed: HIF factors as key regulators of cardiac metabolism and angiogenesis during ischemia. J Mol Med (Berl) 2007; 85:1309-15. [PMID: 18026917 DOI: 10.1007/s00109-007-0279-x] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Revised: 10/22/2007] [Accepted: 10/23/2007] [Indexed: 12/12/2022]
Abstract
Myocardial ischemia, the most common cause of cardiac hypoxia in clinical medicine, occurs when oxygen delivery cannot meet myocardial metabolic requirements in the heart. This deficiency can result from either a reduced supply of oxygen (decreased coronary bloodflow) or an increased myocardial demand for oxygen (increased wall stress or afterload). Patients with stable coronary artery disease as well as patients experiencing acute myocardial infarction can experience episodes of severe ischemia. Although hypoxia is an obligatory component, it is not the sole environmental stress experienced by the ischemic heart. Reperfusion after ischemia is associated with increased oxidative stress as the heart reverts to aerobic respiration and thereby generates toxic levels of reactive oxygen species (ROS). During mild ischemia, mitochondrial function is partially compromised and substrate preferences adapt to sustain adequate ATP generation. With severe ischemia, mitochondrial function is markedly compromised and anaerobic metabolism must provide energy no matter what the cost in generation of toxic ROS adducts. Ischemia produces a variety of environmental stresses that impair cardiovascular function. As a result, multiple signaling pathways are activated in mammalian cells during ischemia/reperfusion injury in an attempt to minimize cellular injury and maintain cardiac output. Amongst the transcriptional regulators activated are members of the hypoxia inducible factor (HIF) transcription factor family. HIF factors regulate a variety of genes that affect a myriad of cellular processes including metabolism, angiogenesis, cell survival, and oxygen delivery, all of which are important in the heart. In this review, we will focus on the metabolic and angiogenic aspects of HIF biology as they relate to the heart during ischemia. We will review the metabolic requirements of the heart under normal as well as hypoxic conditions, the effects of preconditioning and its regulation as it pertains to HIF biology, the apparent roles of HIF-1 and HIF-2 in intermediary metabolism, and translational applications of HIF-1 and HIF-2 biology to cardiac angiogenesis. Increased understanding of the role of HIFs in cardiac ischemia will ultimately influence clinical cardiovascular practice.
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Affiliation(s)
- Ralph V Shohet
- John A. Burns School of Medicine, Center for Cardiovascular Research, University of Hawaii, 651 Ilalo St., Honolulu, HI 96813, USA,
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