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Shao JW, Chen BH, Abu-Shaban K, Baiyasi A, Wu LM, Ma J. Epicardial adipose tissue in obesity with heart failure with preserved ejection fraction: Cardiovascular magnetic resonance biomarker study. World J Cardiol 2024; 16:149-160. [PMID: 38576524 PMCID: PMC10989227 DOI: 10.4330/wjc.v16.i3.149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/09/2024] [Accepted: 02/06/2024] [Indexed: 03/21/2024] Open
Abstract
BACKGROUND Obesity has become a serious public health issue, significantly elevating the risk of various complications. It is a well-established contributor to Heart failure with preserved ejection fraction (HFpEF). Evaluating HFpEF in obesity is crucial. Epicardial adipose tissue (EAT) has emerged as a valuable tool for validating prognostic biomarkers and guiding treatment targets. Hence, assessing EAT is of paramount importance. Cardiovascular magnetic resonance (CMR) imaging is acknowledged as the gold standard for analyzing cardiac function and morphology. We hope to use CMR to assess EAT as a bioimaging marker to evaluate HFpEF in obese patients. AIM To assess the diagnostic utility of CMR for evaluating heart failure with preserved ejection fraction [HFpEF; left ventricular (LV) ejection fraction ≥ 50%] by measuring the epicardial adipose tissue (EAT) volumes and EAT mass in obese patients. METHODS Sixty-two obese patients were divided into two groups for a case-control study based on whether or not they had heart failure with HFpEF. The two groups were defined as HFpEF+ and HFpEF-. LV geometry, global systolic function, EAT volumes and EAT mass of all subjects were obtained using cine magnetic resonance sequences. RESULTS Forty-five patients of HFpEF- group and seventeen patients of HFpEF+ group were included. LV mass index (g/m2) of HFpEF+ group was higher than HFpEF- group (P < 0.05). In HFpEF+ group, EAT volumes, EAT volume index, EAT mass, EAT mass index and the ratio of EAT/[left atrial (LA) left-right (LR) diameter] were higher compared to HFpEF- group (P < 0.05). In multivariate analysis, Higher EAT/LA LR diameter ratio was associated with higher odds ratio of HFpEF. CONCLUSION EAT/LA LR diameter ratio is highly associated with HFpEF in obese patients. It is plausible that there may be utility in CMR for assessing obese patients for HFpEF using EAT/LA LR diameter ratio as a diagnostic biomarker. Further prospective studies, are needed to validate these proof-of-concept findings.
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Affiliation(s)
- Ju-Wei Shao
- Department of Radiology, The Affiliated Hospital of Yunnan University, Kunming 650021, Yunnan Province, China
| | - Bing-Hua Chen
- Department of Radiology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Kamil Abu-Shaban
- Department of Radiology, University of Toledo College of Medicine, Toledo, OH 43623, United States
| | - Ahmad Baiyasi
- Department of Radiology, Wayne State University School of Medicine, Detroit, MI 48201, United States
| | - Lian-Ming Wu
- Department of Radiology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
| | - Jing Ma
- Department of Endocrinology, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China.
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Sinha RA. Targeting nuclear receptors for NASH/MASH: From bench to bedside. LIVER RESEARCH 2024; 8:34-45. [PMID: 38544909 PMCID: PMC7615772 DOI: 10.1016/j.livres.2024.03.002] [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: 04/17/2024]
Abstract
The onset of metabolic dysfunction-associated steatohepatitis (MASH) or non-alcoholic steatohepatitis (NASH) represents a tipping point leading to liver injury and subsequent hepatic complications in the natural progression of what is now termed metabolic dysfunction-associated steatotic liver diseases (MASLD), formerly known as non-alcoholic fatty liver disease (NAFLD). With no pharmacological treatment currently available for MASH/NASH, the race is on to develop drugs targeting multiple facets of hepatic metabolism, inflammation, and pro-fibrotic events, which are major drivers of MASH. Nuclear receptors (NRs) regulate genomic transcription upon binding to lipophilic ligands and govern multiple aspects of liver metabolism and inflammation. Ligands of NRs may include hormones, lipids, bile acids, and synthetic ligands, which upon binding to NRs regulate the transcriptional activities of target genes. NR ligands are presently the most promising drug candidates expected to receive approval from the United States Food and Drug Administration as a pharmacological treatment for MASH. This review aims to cover the current understanding of NRs, including nuclear hormone receptors, non-steroid hormone receptors, circadian NRs, and orphan NRs, which are currently undergoing clinical trials for MASH treatment, along with NRs that have shown promising results in preclinical studies.
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Affiliation(s)
- Rohit A Sinha
- Department of Endocrinology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
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Basavarajappa D, Galindo-Romero C, Gupta V, Agudo-Barriuso M, Gupta VB, Graham SL, Chitranshi N. Signalling pathways and cell death mechanisms in glaucoma: Insights into the molecular pathophysiology. Mol Aspects Med 2023; 94:101216. [PMID: 37856930 DOI: 10.1016/j.mam.2023.101216] [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: 08/04/2023] [Revised: 09/25/2023] [Accepted: 10/02/2023] [Indexed: 10/21/2023]
Abstract
Glaucoma is a complex multifactorial eye disease manifesting in retinal ganglion cell (RGC) death and optic nerve degeneration, ultimately causing irreversible vision loss. Research in recent years has significantly enhanced our understanding of RGC degenerative mechanisms in glaucoma. It is evident that high intraocular pressure (IOP) is not the only contributing factor to glaucoma pathogenesis. The equilibrium of pro-survival and pro-death signalling pathways in the retina strongly influences the function and survival of RGCs and optic nerve axons in glaucoma. Molecular evidence from human retinal tissue analysis and a range of experimental models of glaucoma have significantly contributed to unravelling these mechanisms. Accumulating evidence reveals a wide range of molecular signalling pathways that can operate -either alone or via intricate networks - to induce neurodegeneration. The roles of several molecules, including neurotrophins, interplay of intracellular kinases and phosphates, caveolae and adapter proteins, serine proteases and their inhibitors, nuclear receptors, amyloid beta and tau, and how their dysfunction affects retinal neurons are discussed in this review. We further underscore how anatomical alterations in various animal models exhibiting RGC degeneration and susceptibility to glaucoma-related neuronal damage have helped to characterise molecular mechanisms in glaucoma. In addition, we also present different regulated cell death pathways that play a critical role in RGC degeneration in glaucoma.
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Affiliation(s)
- Devaraj Basavarajappa
- Macquarie Medical School, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia.
| | - Caridad Galindo-Romero
- Experimental Ophthalmology Group, Instituto Murciano de Investigación Biosanitaria Virgen de la Arrixaca (IMIB-Arrixaca) & Ophthalmology Department, Universidad de Murcia, Murcia, Spain
| | - Vivek Gupta
- Macquarie Medical School, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - Marta Agudo-Barriuso
- Experimental Ophthalmology Group, Instituto Murciano de Investigación Biosanitaria Virgen de la Arrixaca (IMIB-Arrixaca) & Ophthalmology Department, Universidad de Murcia, Murcia, Spain
| | - Veer B Gupta
- School of Medicine, Deakin University, Melbourne, VIC, Australia
| | - Stuart L Graham
- Macquarie Medical School, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - Nitin Chitranshi
- Macquarie Medical School, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia.
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4
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Yoo HS, Moss KO, Cockrum MA, Woo W, Napoli JL. Energy status regulates levels of the RAR/RXR ligand 9-cis-retinoic acid in mammalian tissues: Glucose reduces its synthesis in β-cells. J Biol Chem 2023; 299:105255. [PMID: 37714463 PMCID: PMC10582780 DOI: 10.1016/j.jbc.2023.105255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 09/01/2023] [Accepted: 09/10/2023] [Indexed: 09/17/2023] Open
Abstract
9-cis-retinoic acid (9cRA) binds retinoic acid receptors (RAR) and retinoid X receptors (RXR) with nanomolar affinities, in contrast to all-trans-retinoic acid (atRA), which binds only RAR with nanomolar affinities. RXR heterodimerize with type II nuclear receptors, including RAR, to regulate a vast gene array. Despite much effort, 9cRA has not been identified as an endogenous retinoid, other than in pancreas. By revising tissue analysis methods, 9cRA quantification by liquid chromatography-tandem mass spectrometry becomes possible in all mouse tissues analyzed. 9cRA occurs in concentrations similar to or greater than atRA. Fasting increases 9cRA in white and brown adipose, brain and pancreas, while increasing atRA in white adipose, liver and pancreas. 9cRA supports FoxO1 actions in pancreas β-cells and counteracts glucose actions that lead to glucotoxicity; in part by inducing Atg7 mRNA, which encodes the key enzyme essential for autophagy. Glucose suppresses 9cRA biosynthesis in the β-cell lines 832/13 and MIN6. Glucose reduces 9cRA biosynthesis in 832/13 cells by inhibiting Rdh5 transcription, unconnected to insulin, through cAMP and Akt, and inhibiting FoxO1. Through adapting tissue specifically to fasting, 9cRA would act independent of atRA. Widespread occurrence of 9cRA in vivo, and its self-sufficient adaptation to energy status, provides new perspectives into regulation of energy balance, attenuation of insulin and glucose actions, regulation of type II nuclear receptors, and retinoid biology.
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Affiliation(s)
- Hong Sik Yoo
- Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, Berkeley, California, USA
| | - Kristin Obrochta Moss
- Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, Berkeley, California, USA
| | - Michael A Cockrum
- Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, Berkeley, California, USA
| | - Wonsik Woo
- Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, Berkeley, California, USA
| | - Joseph L Napoli
- Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, Berkeley, California, USA.
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Dorofeeva I, Zhylkibayev A, Saltykova IV, Atigadda V, Adhikari B, Gorbatyuk OS, Grant MB, Gorbatyuk MS. Retinoid X Receptor Activation Prevents Diabetic Retinopathy in Murine Models. Cells 2023; 12:2361. [PMID: 37830574 PMCID: PMC10571672 DOI: 10.3390/cells12192361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/20/2023] [Accepted: 09/22/2023] [Indexed: 10/14/2023] Open
Abstract
Previously, the RXR agonist UAB126 demonstrated therapeutic potential to treat obese mice by controlling blood glucose levels (BGL) and altering the expression of genes associated with lipid metabolism and inflammatory response. The purpose of the study was to assess the effects of UAB126 on the progression of diabetic retinopathy (DR) in rodent models of type 1 diabetes (T1D), streptozotocin-induced, and type 2 diabetes (T2D), in db/db mice. UAB126 treatment was delivered either by oral gavage for 6 weeks or by topical application of eye drops for 2 weeks. At the end of the treatment, the retinal function of diabetic mice was assessed by electroretinography (ERG), and their retinal tissue was harvested for protein and gene expression analyses. Bone-marrow cells were isolated and differentiated into bone marrow-derived macrophages (BMDMs). The glycolysis stress test and the 2-DG glucose uptake analysis were performed. Our results demonstrated that in the UAB126-treated diabetic BMDMs, the ECAR rate and the 2-DG uptake were improved as compared to untreated diabetic BMDMs. In UAB126-treated diabetic mice, hyperglycemia was reduced and associated with the preservation of ERG amplitudes and enhanced AMPK activity. Retinas from diabetic mice treated with topical UAB126 demonstrated an increase in Rxr and Ppar and the expression of genes associated with lipid metabolism. Altogether, our data indicate that RXR activation is beneficial to preclinical models of DR.
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Affiliation(s)
- Iuliia Dorofeeva
- Department of Optometry and Vision Science, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (I.D.); (A.Z.); (I.V.S.); (B.A.); (O.S.G.)
| | - Assylbek Zhylkibayev
- Department of Optometry and Vision Science, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (I.D.); (A.Z.); (I.V.S.); (B.A.); (O.S.G.)
| | - Irina V. Saltykova
- Department of Optometry and Vision Science, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (I.D.); (A.Z.); (I.V.S.); (B.A.); (O.S.G.)
| | - Venkatram Atigadda
- Department of Dermatology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA;
| | - Bibek Adhikari
- Department of Optometry and Vision Science, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (I.D.); (A.Z.); (I.V.S.); (B.A.); (O.S.G.)
| | - Oleg S. Gorbatyuk
- Department of Optometry and Vision Science, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (I.D.); (A.Z.); (I.V.S.); (B.A.); (O.S.G.)
| | - Maria B. Grant
- Department of Ophthalmology and Vision Sciences, Heersink School of Medicined, University of Alabama at Birmingham, Birmingham, AL 35233, USA;
| | - Marina S. Gorbatyuk
- Department of Optometry and Vision Science, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35233, USA; (I.D.); (A.Z.); (I.V.S.); (B.A.); (O.S.G.)
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Zhang Y, Xie Y, Huang L, Zhang Y, Li X, Fang Q, Wang Q. Association of Sleep Duration and Self-Reported Insomnia Symptoms with Metabolic Syndrome Components among Middle-Aged and Older Adults. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:11637. [PMID: 36141918 PMCID: PMC9517288 DOI: 10.3390/ijerph191811637] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 09/08/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
The study aimed to explore the association between sleep duration, insomnia symptoms and the components of metabolic syndrome (MetS) among middle-aged and older adults. A cross-sectional study was conducted in five community health centers and physical check-up centers of two comprehensive hospitals in Guangdong. We recruited 1252 participants (658 female), aged 40-96 years and with a body mass index (BMI) of 16.26-35.56 kg/m2. MetS was assessed based on the guidelines of the International Diabetes Federation. Self-reported sleep duration was evaluated by a simplified questionnaire. Compared with the participants who slept 6-8 h/day, those who slept shorter (<6 h/day) or longer (>8 h/day) periods of time with or without insomnia symptoms had significantly increased odds ratios (ORs) of high blood pressure (except for the SBP in model 2) and high triglycerides (TGs) in all models (p < 0.05), whereas the participants who slept longer (>8 h/day) or shorter (<6 h/day) periods of time with insomnia symptoms had significantly increased ORs of low HDL-C in all models (p < 0.05), but non-significant in those without insomnia symptoms. BMI is significant for insomnia symptoms but not for sleep duration. Our study indicated that the association of sleep duration with MetS components was partially associated with insomnia symptoms. These findings have significant implications to explore the appropriate sleep duration for adults.
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Affiliation(s)
- Yuting Zhang
- Health Science Centre, Shenzhen University, Shenzhen 518060, China
| | - Yingcai Xie
- Department of Endocrinology, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, China
| | - Lingling Huang
- Health Science Centre, Shenzhen University, Shenzhen 518060, China
| | - Yan Zhang
- Health Science Centre, Shenzhen University, Shenzhen 518060, China
| | - Xilin Li
- Health Science Centre, Shenzhen University, Shenzhen 518060, China
| | - Qiyu Fang
- Health Science Centre, Shenzhen University, Shenzhen 518060, China
| | - Qun Wang
- Health Science Centre, Shenzhen University, Shenzhen 518060, China
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Ren G, Hwang PTJ, Millican R, Shin J, Brott BC, van Groen T, Powell CM, Bhatnagar S, Young ME, Jun HW, Kim JA. Subcutaneous Administration of a Nitric Oxide-Releasing Nanomatrix Gel Ameliorates Obesity and Insulin Resistance in High-Fat Diet-Induced Obese Mice. ACS APPLIED MATERIALS & INTERFACES 2022; 14:19104-19115. [PMID: 35467831 PMCID: PMC9233978 DOI: 10.1021/acsami.1c24113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Nitric oxide (NO) is a gaseous signaling molecule, which plays crucial roles in various biological processes, including inflammatory responses, metabolism, cardiovascular functions, and cognitive function. NO bioavailability is reduced with aging and cardiometabolic disorders in humans and rodents. NO stimulates the metabolic rate by increasing the mitochondrial biogenesis and brown fat activation. Therefore, we propose a novel technology of providing exogenous NO to improve the metabolic rate and cognitive function by promoting the development of brown adipose tissue. In the present study, we demonstrate the effects of the peptide amphiphiles-NO-releasing nanomatrix gel (PANO gel) on high-fat diet-induced obesity, insulin resistance, and cognitive functions. Eight-week-old male C57BL/6 mice were subcutaneously injected in the brown fat area with the PANO gel or vehicle (PA gel) every 2 weeks for 12 weeks. The PANO gel-injected mice gained less body weight, improved glucose tolerance, and decreased fasting serum insulin and leptin levels compared with the PA gel-injected mice. Insulin signaling in the muscle, liver, and epididymal white adipose tissue was improved by the PANO gel injection. The PANO gel reduced inflammation, increased lipolysis in the epididymal white adipose tissue, and decreased serum lipids and liver triglycerides. Interestingly, the PANO gel stimulated uncoupled protein 1 gene expression in the brown and beige fat tissues. Furthermore, the PANO gel increased the cerebral blood flow and improved learning and memory abilities. Our results suggest that using the PANO gel to supply exogenous NO is a novel technology to treat metabolic disorders and cognitive dysfunctions.
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Affiliation(s)
- Guang Ren
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, University of Alabama at Birmingham, Birmingham, AL 35294
| | | | | | - Juhee Shin
- Department of Biomedical engineering, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Brigitta C. Brott
- Endomimetics, LLC, Birmingham, AL 35242
- Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Thomas van Groen
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Craig M. Powell
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Sushant Bhatnagar
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, University of Alabama at Birmingham, Birmingham, AL 35294
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Martin E. Young
- Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL 35294
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Ho-Wook Jun
- Endomimetics, LLC, Birmingham, AL 35242
- Department of Biomedical engineering, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Jeong-a Kim
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, University of Alabama at Birmingham, Birmingham, AL 35294
- UAB Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
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Thangavelu G, Zaiken MC, Mohamed FA, Flynn R, Du J, Rhee SY, Riddle MJ, Aguilar EG, Panoskaltsis-Mortari A, Sanders ME, Blazar BR. Targeting the Retinoid X Receptor Pathway Prevents and Ameliorates Murine Chronic Graft-Versus-Host Disease. Front Immunol 2022; 13:765319. [PMID: 35359939 PMCID: PMC8963714 DOI: 10.3389/fimmu.2022.765319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 01/26/2022] [Indexed: 02/03/2023] Open
Abstract
Most allogeneic hematopoietic stem cell transplant (allo-HSCT) recipients receive peripheral blood stem cell grafts resulting in a 30%-70% incidence of chronic graft-versus-host disease (cGVHD), a major cause of mortality and morbidity in long-term survivors. While systemic steroids remain the standard of care for first-line therapy, patients may require long-term administration, and those with steroid-resistant or refractory cGVHD have a worse prognosis. Although durable and deep responses with second-line therapies can be achieved in some patients, there remains an urgent need for new therapies. In this study, we evaluated the efficacy of IRX4204, a novel agonist that activates RXRs and is in clinical trials for cancer treatment to prevent and treat cGVHD in two complementary murine models. In a major histocompatibility complex mismatched, non-sclerodermatous multiorgan system model with bronchiolitis obliterans, IRX4204 prevented and reversed cGVHD including associated pulmonary dysfunction with restoration of germinal center T-follicular helper: T-follicular regulatory cell balance. In a minor histocompatibility antigen disparate sclerodermatous model, IRX4204 treatment significantly prevented and ameliorated skin cGVHD by reducing Th1 and Th17 differentiation due to anti-inflammatory properties. Together, these results indicate that IRX4204 is a promising therapeutic option to treat cGVHD with bronchiolitis obliterans or sclerodermatous manifestations.
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Affiliation(s)
- Govindarajan Thangavelu
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Michael C. Zaiken
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Fathima A. Mohamed
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Ryan Flynn
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Jing Du
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Stephanie Y. Rhee
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Megan J. Riddle
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Ethan G. Aguilar
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | - Angela Panoskaltsis-Mortari
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
| | | | - Bruce R. Blazar
- Department of Pediatrics, Division of Blood & Marrow Transplantation & Cellular Therapy, University of Minnesota, Minneapolis, MN, United States
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Lyu J, Fukunaga K, Imachi H, Sato S, Kobayashi T, Saheki T, Ibata T, Yoshimura T, Iwama H, Murao K. Oxidized LDL Downregulates ABCA1 Expression via MEK/ERK/LXR Pathway in INS-1 Cells. Nutrients 2021; 13:nu13093017. [PMID: 34578896 PMCID: PMC8465850 DOI: 10.3390/nu13093017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 08/23/2021] [Accepted: 08/24/2021] [Indexed: 12/23/2022] Open
Abstract
Impaired insulin secretion is one of the main causes of type 2 diabetes. Cholesterol accumulation-induced lipotoxicity contributes to impaired insulin secretion in pancreatic beta cells. However, the detailed mechanism in this process remains unclear. In this study, we proved that oxidized low-density lipoprotein (OxLDL) reduced insulin content, decreased PDX-1 expression, and impaired glucose-stimulated insulin secretion (GSIS) in INS-1 cells, which were rescued by addition of high-density lipoprotein (HDL). OxLDL receptors and cholesterol content were increased by OxLDL. Consistently, OxLDL suppressed cholesterol transporter ABCA1 expression and transcription in a dose-dependent and time-dependent manner. Inhibition of MEK by its specific inhibitor, PD98059, altered the effect of OxLDL on ABCA1 transcription and activation of ERK. Next, chromatin immunoprecipitation assay demonstrated that liver X receptor (LXR) could directly bind to ABCA1 promoter and this binding was inhibited by OxLDL. Furthermore, OxLDL decreased the nuclear LXR expression, which was prevented by HDL. LXR-enhanced ABCA1 transcription was suppressed by OxLDL, and the effect was cancelled by mutation of the LXR-binding sites. In summary, our study shows that OxLDL down-regulates ABCA1 expression by MEK/ERK/LXR pathway, leading to cholesterol accumulation in INS-1 cells, which may result in impaired insulin synthesis and GSIS.
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Affiliation(s)
- Jingya Lyu
- Department of Physiology, School of Medicine, Jinan University, 601 Huangpu Avenue West, Tianhe District, Guangzhou 510632, China;
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Kensaku Fukunaga
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Hitomi Imachi
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Seisuke Sato
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Toshihiro Kobayashi
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Takanobu Saheki
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Tomohiro Ibata
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Takafumi Yoshimura
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
| | - Hisakazu Iwama
- Life Science Research Center, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan;
| | - Koji Murao
- Department of Endocrinology and Metabolism, Faculty of Medicine, Kagawa University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan; (K.F.); (H.I.); (S.S.); (T.K.); (T.S.); (T.I.); (T.Y.)
- Correspondence:
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Chen G. The Interactions of Insulin and Vitamin A Signaling Systems for the Regulation of Hepatic Glucose and Lipid Metabolism. Cells 2021; 10:2160. [PMID: 34440929 PMCID: PMC8393264 DOI: 10.3390/cells10082160] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/17/2021] [Accepted: 08/19/2021] [Indexed: 02/07/2023] Open
Abstract
The pandemics of obesity and type 2 diabetes have become a concern of public health. Nutrition plays a key role in these concerns. Insulin as an anabolic hormonal was discovered exactly 100 years ago due to its activity in controlling blood glucose level. Vitamin A (VA), a lipophilic micronutrient, has been shown to regulate glucose and fat metabolism. VA's physiological roles are mainly mediated by its metabolite, retinoic acid (RA), which activates retinoic acid receptors (RARs) and retinoid X receptors (RXRs), which are two transcription factors. The VA status and activations of RARs and RXRs by RA and synthetic agonists have shown to affect the glucose and lipid metabolism in animal models. Both insulin and RA signaling systems regulate the expression levels of genes involved in the regulation of hepatic glucose and lipid metabolism. Interactions of insulin and RA signaling systems have been observed. This review is aimed at summarizing the history of diabetes, insulin and VA signaling systems; the effects of VA status and activation of RARs and RXRs on metabolism and RAR and RXR phosphorylation; and possible interactions of insulin and RA in the regulation of hepatic genes for glucose and lipid metabolism. In addition, some future research perspectives for understanding of nutrient and hormone interactions are provided.
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Affiliation(s)
- Guoxun Chen
- Department of Nutrition, University of Tennessee at Knoxville, Knoxville, TN 37996, USA
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