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Jin L, Diaz-Canestro C, Wang Y, Tse MA, Xu A. Exerkines and cardiometabolic benefits of exercise: from bench to clinic. EMBO Mol Med 2024; 16:432-444. [PMID: 38321233 PMCID: PMC10940599 DOI: 10.1038/s44321-024-00027-z] [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: 10/13/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 02/08/2024] Open
Abstract
Regular exercise has both immediate and long-lasting benefits on cardiometabolic health, and has been recommended as a cornerstone of treatment in the management of diabetes and cardiovascular conditions. Exerkines, which are defined as humoral factors responsive to acute or chronic exercise, have emerged as important players conferring some of the multiple cardiometabolic benefits of exercise. Over the past decades, hundreds of exerkines released from skeletal muscle, heart, liver, adipose tissue, brain, and gut have been identified, and several exerkines (such as FGF21, IL-6, and adiponectin) have been exploited therapeutically as exercise mimetics for the treatment of various metabolic and cardiovascular diseases. Recent advances in metagenomics have led to the identification of gut microbiota, a so-called "hidden" metabolic organ, as an additional class of exerkines determining the efficacy of exercise in diabetes prevention, cardiac protection, and exercise performance. Furthermore, multiomics-based studies have shown the feasibility of using baseline exerkine signatures to predict individual responses to exercise with respect to metabolic and cardiorespiratory health. This review aims to explore the molecular pathways whereby exerkine networks mediate the cardiometabolic adaptations to exercise by fine-tuning inter-organ crosstalk, and discuss the roadmaps for translating exerkine-based discovery into the therapeutic application and personalized medicine in the management of the cardiometabolic disease.
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Affiliation(s)
- Leigang Jin
- State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong, Hong Kong, China
- Department of Medicine, The University of Hong Kong, Hong Kong, China
| | - Candela Diaz-Canestro
- State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong, Hong Kong, China
- Department of Medicine, The University of Hong Kong, Hong Kong, China
| | - Yu Wang
- State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong, Hong Kong, China
- Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong, China
| | - Michael Andrew Tse
- State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong, Hong Kong, China
- Centre for Sports and Exercise, The University of Hong Kong, Hong Kong, China
| | - Aimin Xu
- State Key Laboratory of Pharmaceutical Biotechnology, The University of Hong Kong, Hong Kong, China.
- Department of Medicine, The University of Hong Kong, Hong Kong, China.
- Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong, China.
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2
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Liu T, Wang Q, Zhou L, Zhang P, Mi L, Qiu X, Chen Z, Kuang H, Li S, Lin JD. Intrahepatic paracrine signaling by cardiotrophin-like cytokine factor 1 ameliorates diet-induced NASH in mice. Hepatology 2023; 78:1478-1491. [PMID: 35950514 PMCID: PMC9918604 DOI: 10.1002/hep.32719] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 08/03/2022] [Accepted: 08/05/2022] [Indexed: 12/08/2022]
Abstract
BACKGROUND AND AIMS The mammalian liver harbors heterogeneous cell types that communicate via local paracrine signaling. Recent studies have delineated the transcriptomic landscape of the liver in NASH that provides insights into liver cell heterogeneity, intercellular crosstalk, and disease-associated reprogramming. However, the nature of intrahepatic signaling and its role in NASH progression remain obscure. APPROACH AND RESULTS Here, we performed transcriptomic analyses and identified cardiotrophin-like cytokine factor 1 (CLCF1), a member of the IL-6 family cytokines, as a cholangiocyte-derived paracrine factor that was elevated in the liver from diet-induced NASH mice and patients with NASH. Adenovirus-associated virus-mediated overexpression of CLCF1 in the liver ameliorated NASH pathologies in two diet-induced NASH models in mice, illustrating that CLCF1 induction may serve an adaptive and protective role during NASH pathogenesis. Unexpectedly, messenger RNA and protein levels of leukemia inhibitory factor receptor (LIFR), a subunit of the receptor complex for CLCF1, were markedly downregulated in NASH liver. Hepatocyte-specific inactivation of LIFR accelerated NASH progression in mice, supporting an important role of intrahepatic cytokine signaling in maintaining tissue homeostasis under metabolic stress conditions. CONCLUSIONS Together, this study sheds light on the molecular nature of intrahepatic paracrine signaling during NASH pathogenesis and uncovers potential targets for therapeutic intervention.
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Affiliation(s)
- Tongyu Liu
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Qiuyu Wang
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Linkang Zhou
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Peng Zhang
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Lin Mi
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Xiaoxue Qiu
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Zhimin Chen
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Henry Kuang
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Siming Li
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
| | - Jiandie D. Lin
- Life Sciences Institute and Department of Cell & Developmental Biology, University of Michigan Medical Center, Ann Arbor, MI 48109
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3
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Underlying Mechanisms Involved in Gambling Disorder Severity: A Pathway Analysis Considering Genetic, Psychosocial, and Clinical Variables. Nutrients 2023; 15:nu15020418. [PMID: 36678289 PMCID: PMC9864492 DOI: 10.3390/nu15020418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 12/29/2022] [Accepted: 01/10/2023] [Indexed: 01/14/2023] Open
Abstract
Gambling Disorder (GD) has a complex etiology that involves biological and environmental aspects. From a genetic perspective, neurotrophic factors (NTFs) polymorphisms have been associated with the risk of developing GD. The aim of this study was to assess the underlying mechanisms implicated in GD severity by considering the direct and mediational relationship between different variables including genetic, psychological, socio-demographic, and clinical factors. To do so, we used genetic variants that were significantly associated with an increased risk for GD and evaluated its relationship with GD severity through pathway analysis. We found that the interaction between these genetic variants and other different biopsychological features predicted a higher severity of GD. On the one hand, the presence of haplotype block 2, interrelated with haplotype block 3, was linked to a more dysfunctional personality profile and a worse psychopathological state, which, in turn, had a direct link with GD severity. On the other hand, having rs3763614 predicted higher general psychopathology and therefore, higher GD severity. The current study described the presence of complex interactions between biopsychosocial variables previously associated with the etiopathogenesis and severity of GD, while also supporting the involvement of genetic variants from the NTF family.
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Yang Y, Zhong W, Zhang Y, Cheng Y, Lai H, Yu H, Feng N, Han Y, Huang R, Zhai Q. Sustained Inflammation Induced by LPS Leads to Tolerable Anorexia and Fat Loss via Tlr4 in Mice. J Inflamm Res 2022; 15:5635-5648. [PMID: 36211223 PMCID: PMC9534160 DOI: 10.2147/jir.s358518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 09/06/2022] [Indexed: 11/24/2022] Open
Abstract
Background Sustained inflammation is implicated in a variety of pathological conditions like infection, obesity and type 2 diabetes. Lipid metabolism is crucial to support immune response during infection of bacteria. However, how sustained inflammation affects lipid metabolism, especially in white adipose tissue remains largely unknown. Methods Sustained inflammation was induced by daily injection of Lipopolysaccharide (LPS). Tlr4 knockout mice were used to study the mechanism. Inflammation and lipid metabolism were evaluated by quantitative PCR, white blood cell counting, nuclear magnetic resonance, fat cell size quantification, lipolysis and fatty acid uptake assays, respiratory exchange ratio, and energy expenditure. Results Here, we found that sustained inflammation leads to fat loss in mice with a quick loss and gradual increase manner. Moreover, LPS injection leads to inflammation, anorexia, decreased lipid anabolism, and increased lipid catabolism. Mechanically, we show that LPS induces fat loss, inflammation, anorexia, and alteration of lipid metabolism mainly dependent on Tlr4. Interestingly, sustained inflammation induces less fat loss, especially in epididymal white adipose tissue, than pair-feeding, and pair-feeding has no significant effect on inflammation and leads to less fatty acid uptake, more lipid catabolism and energy expenditure than LPS injection. In addition, we demonstrate that short-term sustained inflammation leads to relative long-term tolerance for LPS-induced anorexia, inflammation and altered lipid metabolism. Conclusion These findings demonstrate that sustained inflammation induced by LPS leads to tolerable anorexia and fat loss via Tlr4 in mice, and provide new insights into the effect of sustained inflammation on lipid metabolism and subsequent tolerance.
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Affiliation(s)
- Yale Yang
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Wuling Zhong
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Yali Zhang
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Yalan Cheng
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Hejin Lai
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Huimin Yu
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Ning Feng
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Yumo Han
- School of Life Science and Technology, ShanghaiTech University, Shanghai, People’s Republic of China
| | - Rui Huang
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Qiwei Zhai
- CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, People’s Republic of China
- School of Life Science and Technology, ShanghaiTech University, Shanghai, People’s Republic of China
- Correspondence: Qiwei Zhai, Shanghai, 200031, People’s Republic of China, Tel +86 21 5492 0903, Fax +86 21 5492 0291, Email
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5
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Ciliary neurotrophic factor is increased in the plasma of patients with obesity and its levels correlate with diabetes and inflammation indices. Sci Rep 2022; 12:8331. [PMID: 35585213 PMCID: PMC9117681 DOI: 10.1038/s41598-022-11942-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 04/22/2022] [Indexed: 11/09/2022] Open
Abstract
To establish whether obesity involves activation of endogenous ciliary neurotrophic factor (CNTF) signalling, we evaluated its plasma levels in patients with obesity and correlated its values with the major clinical and haematological indices of obesity, insulin resistance and systemic inflammation. This study involved 118 subjects: 39 healthy controls (19 men), 39 subjects with obesity (19 men) and 40 subjects with obesity and diabetes (20 men). Plasma CNTF and CNTF receptor α (CNTFRα) were measured using commercial ELISA kits. The results showed that plasma CNTF was significantly higher in males and females with obesity with and without diabetes than in healthy subjects. Women consistently exhibited higher levels of circulating CNTF. In both genders, CNTF levels correlated significantly and positively with obesity (BMI, WHR, leptin), diabetes (fasting insulin, HOMA index and HbA1c) and inflammation (IL-6 and hsCRP) indices. Circulating CNTFRα and the CNTF/CNTFRα molar ratio tended to be higher in the patient groups than in controls. In conclusion, endogenous CNTF signalling is activated in human obesity and may help counteract some adverse effects of obesity. Studies involving a higher number of selected patients may reveal circulating CNTF and/or CNTFRα as potential novel diagnostic and/or prognostic markers of obesity, diabetes and associated diseases.
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Solé-Morata N, Baenas I, Etxandi M, Granero R, Forcales SV, Gené M, Barrot C, Gómez-Peña M, Menchón JM, Ramoz N, Gorwood P, Fernández-Aranda F, Jiménez-Murcia S. The role of neurotrophin genes involved in the vulnerability to gambling disorder. Sci Rep 2022; 12:6925. [PMID: 35484167 PMCID: PMC9051155 DOI: 10.1038/s41598-022-10391-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 04/07/2022] [Indexed: 01/16/2023] Open
Abstract
Evidence about the involvement of genetic factors in the development of gambling disorder (GD) has been assessed. Among studies assessing heritability and biological vulnerability for GD, neurotrophin (NTF) genes have emerged as promising targets, since a growing literature showed a possible link between NTF and addiction-related disorders. Thus, we aimed to explore the role of NTF genes and GD with the hypothesis that some NTF gene polymorphisms could constitute biological risk factors. The sample included 166 patients with GD and 191 healthy controls. 36 single nucleotide polymorphisms (SNPs) from NTFs (NGF, NGFR, NTRK1, BDNF, NTRK2, NTF3, NTRK3, NTF4, CNTF and CNTFR) were selected and genotyped. Linkage disequilibrium (LD) and haplotype constructions were analyzed, in relationship with the presence of GD. Finally, regulatory elements overlapping the identified SNPs variants associated with GD were searched. The between groups comparisons of allele frequencies indicated that 6 SNPs were potentially associated with GD. Single and multiple-marker analyses showed a strong association between both NTF3 and NTRK2 genes, and GD. The present study supports the involvement of the NTF family in the aetiopathogenesis of GD. An altered cross-regulation of different NTF members signalling pathways might be considered as a biological vulnerability factor for GD.
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Affiliation(s)
- Neus Solé-Morata
- Department of Psychiatry, Bellvitge University Hospital, c/Feixa Llarga S/N, Hospitalet de Llobregat, 08907, Barcelona, Spain
| | - Isabel Baenas
- Department of Psychiatry, Bellvitge University Hospital, c/Feixa Llarga S/N, Hospitalet de Llobregat, 08907, Barcelona, Spain.,Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain.,Ciber Physiopathology of Obesity and Nutrition (CIBERObn), Instituto de Salud Carlos III, Barcelona, Spain
| | - Mikel Etxandi
- Department of Psychiatry, Bellvitge University Hospital, c/Feixa Llarga S/N, Hospitalet de Llobregat, 08907, Barcelona, Spain
| | - Roser Granero
- Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain.,Ciber Physiopathology of Obesity and Nutrition (CIBERObn), Instituto de Salud Carlos III, Barcelona, Spain.,Department of Psychobiology and Methodology, Autonomous University of Barcelona, Bellaterra, Spain
| | - Sonia V Forcales
- Serra Húnter Programme, Department of Pathology and Experimental Therapeutics, Faculty of Medicine and Health Sciences, University of Barcelona, Hospitalet de Llobregat, 08907, Spain
| | - Manel Gené
- Genetic Lab, Forensic and Legal Medicine Unit, Department of Clinical Sciences, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
| | - Carme Barrot
- Genetic Lab, Forensic and Legal Medicine Unit, Department of Clinical Sciences, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
| | - Mónica Gómez-Peña
- Department of Psychiatry, Bellvitge University Hospital, c/Feixa Llarga S/N, Hospitalet de Llobregat, 08907, Barcelona, Spain.,Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain
| | - José M Menchón
- Department of Psychiatry, Bellvitge University Hospital, c/Feixa Llarga S/N, Hospitalet de Llobregat, 08907, Barcelona, Spain.,Department of Clinical Sciences, School of Medicine and Health Sciences, University of Barcelona, Hospitalet del Llobregat, Spain.,Ciber of Mental Health (CIBERSAM), Instituto de Salud Carlos III, Barcelona, Spain.,Psychiatry and Mental Health Group, Neuroscience Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet del Llobregat, Spain
| | - Nicolás Ramoz
- Psychiatry and Mental Health Group, Neuroscience Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet del Llobregat, Spain.,Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, Team Vulnerability of Psychiatric and Addictive Disorders, Université de Paris, 75014, Paris, France
| | - Philip Gorwood
- Psychiatry and Mental Health Group, Neuroscience Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet del Llobregat, Spain.,Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, Team Vulnerability of Psychiatric and Addictive Disorders, Université de Paris, 75014, Paris, France
| | - Fernando Fernández-Aranda
- Department of Psychiatry, Bellvitge University Hospital, c/Feixa Llarga S/N, Hospitalet de Llobregat, 08907, Barcelona, Spain.,Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain.,Ciber Physiopathology of Obesity and Nutrition (CIBERObn), Instituto de Salud Carlos III, Barcelona, Spain.,Department of Clinical Sciences, School of Medicine and Health Sciences, University of Barcelona, Hospitalet del Llobregat, Spain
| | - Susana Jiménez-Murcia
- Department of Psychiatry, Bellvitge University Hospital, c/Feixa Llarga S/N, Hospitalet de Llobregat, 08907, Barcelona, Spain. .,Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain. .,Ciber Physiopathology of Obesity and Nutrition (CIBERObn), Instituto de Salud Carlos III, Barcelona, Spain. .,Department of Clinical Sciences, School of Medicine and Health Sciences, University of Barcelona, Hospitalet del Llobregat, Spain.
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Maffei M, Giordano A. Leptin, the brain and energy homeostasis: From an apparently simple to a highly complex neuronal system. Rev Endocr Metab Disord 2022; 23:87-101. [PMID: 33822303 DOI: 10.1007/s11154-021-09636-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/11/2021] [Indexed: 12/14/2022]
Abstract
Leptin, produced and secreted by white adipose tissue in tight relationship with adipose mass, informs the brain about the status of the energy stores serving as the main peripheral signal for energy balance regulation through interaction with a multitude of highly interconnected neuronal populations. Most obese patients display resistance to the anorectic effect of the hormone. The present review unravels the multiple levels of complexity that trigger hypothalamic response to leptin with the objective of highlighting those critical hubs that, mainly in the hypothalamic arcuate nucleus, may undergo obesity-induced alterations and create an obstacle to leptin action. Several mechanisms underlying leptin resistance have been proposed, possibly representing useful targets to empower leptin effects. Among these, a special focus is herein dedicated to detail how leptin gains access into the brain and how neuronal plasticity may interfere with leptin function.
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Affiliation(s)
- Margherita Maffei
- Institute of Clinical Physiology, CNR, Via Moruzzi 1, 56124, Pisa, Italy.
- Obesity and Lipodystrophy Center, University Hospital of Pisa, Via Paradisa 2, 56124, Pisa, Italy.
| | - Antonio Giordano
- Department of Experimental and Clinical Medicine, Marche Polytechnic University, Via Tronto 10/A, 60020, Ancona, Italy.
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8
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New insights into IL-6 family cytokines in metabolism, hepatology and gastroenterology. Nat Rev Gastroenterol Hepatol 2021; 18:787-803. [PMID: 34211157 DOI: 10.1038/s41575-021-00473-x] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/20/2021] [Indexed: 02/06/2023]
Abstract
IL-6 family cytokines are defined by the common use of the signal-transducing receptor chain glycoprotein 130 (gp130). Increasing evidence indicates that these cytokines are essential in the regulation of metabolic homeostasis as well as in the pathophysiology of multiple gastrointestinal and liver disorders, thus making them attractive therapeutic targets. Over the past few years, therapies modulating gp130 signalling have grown exponentially in several clinical settings including obesity, cancer and inflammatory bowel disease. A newly engineered gp130 cytokine, IC7Fc, has shown promising preclinical results for the treatment of type 2 diabetes, obesity and liver steatosis. Moreover, drugs that modulate gp130 signalling have shown promise in refractory inflammatory bowel disease in clinical trials. A deeper understanding of the main roles of the IL-6 family of cytokines during homeostatic and pathological conditions, their signalling pathways, sources of production and target cells will be crucial to the development of improved treatments. Here, we review the current state of the role of these cytokines in hepatology and gastroenterology and discuss the progress achieved in translating therapeutics targeting gp130 signalling into clinical practice.
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9
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IL-6 family cytokines as potential therapeutic strategies to treat metabolic diseases. Cytokine 2021; 144:155549. [PMID: 33962843 DOI: 10.1016/j.cyto.2021.155549] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/12/2021] [Accepted: 04/14/2021] [Indexed: 02/06/2023]
Abstract
Metabolic disease is highly prevalent. Here we discuss the therapeutic utility of using gp130 receptor ligands as a therapeutic strategy to treat metabolic disease.
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10
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Amir M, Yu M, He P, Srinivasan S. Hepatic Autonomic Nervous System and Neurotrophic Factors Regulate the Pathogenesis and Progression of Non-alcoholic Fatty Liver Disease. Front Med (Lausanne) 2020; 7:62. [PMID: 32175323 PMCID: PMC7056867 DOI: 10.3389/fmed.2020.00062] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 02/11/2020] [Indexed: 12/21/2022] Open
Abstract
Non-alcoholic fatty liver disease represents a continuum of excessive hepatic steatosis, inflammation and fibrosis. It is a growing epidemic in the United States of America and worldwide. Progression of non-alcoholic fatty liver disease can lead to morbidity and mortality due to complications such as cirrhosis or hepatocellular carcinoma. Pathogenesis of non-alcoholic fatty liver disease is centered on increased hepatic lipogenesis and decreased hepatic lipolysis in the setting of hepatic and systemic insulin resistance. Adipose tissue and hepatic inflammation can further perpetuate the severity of illness. Currently there are no approved therapies for non-alcoholic fatty liver disease. Most of the drugs being explored for non-alcoholic fatty liver disease focus on classical pathogenic pathways surrounding hepatic lipid accumulation, inflammation or fibrosis. Studies have demonstrated that the autonomic nervous system innervating the liver plays a crucial role in regulation of hepatic lipid homeostasis, inflammation and fibrosis. Additionally, there is growing evidence that neurotrophic factors can modulate all stages of non-alcoholic fatty liver disease. Both the autonomic nervous system and neurotrophic factors are altered in patients and murine models of non-alcoholic fatty liver disease. In this review we focus on the pathophysiological role of the autonomic nervous system and neurotrophic factors that could be potential targets for novel therapeutic approaches to treat non-alcoholic fatty liver disease.
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Affiliation(s)
- Muhammad Amir
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, United States
| | - Michael Yu
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, United States
| | - Peijian He
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, United States
| | - Shanthi Srinivasan
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA, United States.,Research-Gastroenterology, Atlanta VA Health Care System, Decatur, GA, United States
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11
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Ghadge AA, Khaire AA. Leptin as a predictive marker for metabolic syndrome. Cytokine 2019; 121:154735. [DOI: 10.1016/j.cyto.2019.154735] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/16/2019] [Accepted: 05/24/2019] [Indexed: 02/07/2023]
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12
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Perugini J, Di Mercurio E, Tossetta G, Severi I, Monaco F, Reguzzoni M, Tomasetti M, Dani C, Cinti S, Giordano A. Biological Effects of Ciliary Neurotrophic Factor on hMADS Adipocytes. Front Endocrinol (Lausanne) 2019; 10:768. [PMID: 31781039 PMCID: PMC6861295 DOI: 10.3389/fendo.2019.00768] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 10/22/2019] [Indexed: 12/15/2022] Open
Abstract
Administration of ciliary neurotrophic factor (CNTF) to experimental animals exerts anti-obesity effects by acting on multiple targets. In white adipose tissue CNTF reduces lipid content, promotes fatty acid (FA) oxidation and improves insulin sensitivity. This study was performed to establish whether CNTF exerts similar effects on human white adipocytes. To this end, adipose differentiation was induced in vitro in human multipotent adipose-derived stem (hMADS) cells. CNTF receptor α (CNTFRα) expression was assessed in hMADS cells and adipocytes by qRT-PCR, Western blotting, and immunocytochemistry. After administration of human recombinant CNTF, signaling pathways and gene expression were evaluated by Western blotting and qRT-PCR. Glucose uptake was assessed by measuring 2-nitrobenzodeoxyglucose uptake with a fluorescence plate reader. Lastly, CNTF-induced anti-inflammatory responses were evaluated in hMADS adipocytes stressed with tumor necrosis factor α (TNFα) for 24 h. Results showed that CNTFRα protein expression was higher in undifferentiated hMADS cells than in hMADS adipocytes, where it was however clearly detectable. In hMADS adipocytes, 1 nM CNTF strongly activated the JAK-STAT3 (Janus kinase-signaling transducer and activator of transcription 3) pathway and acutely and transiently activated the AMPK (AMP-activated protein kinase) and AKT (protein kinase B) pathways. Acute CNTF treatment for 20 min significantly increased basal glucose uptake and was associated with increased AKT phosphorylation. Longer-term (24 and 48 h) treatment reduced the expression of lipogenic markers (FA synthase and sterol regulatory element-binding protein-1) and increased the expression of lipolytic [hormone-sensitive lipase (HSL) and adipose triglyceride lipase (ATGL)] and mitochondrial (peroxisome proliferator-activated receptor γ coactivator-1α and carnitine palmitoyltransferase 1) markers. In TNFα-treated hMADS adipocytes, CNTF significantly reduced the expression of monocyte chemoattractant protein 1 and TNFα-induced AKT inhibition. Collectively, these findings demonstrate for the first time that CNTF plays a role also in human adipocytes, driving their metabolism toward a less lipid-storing and more energy-consuming phenotype.
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Affiliation(s)
- Jessica Perugini
- Department of Experimental and Clinical Medicine, Marche Polytechnic University, Ancona, Italy
| | - Eleonora Di Mercurio
- Department of Experimental and Clinical Medicine, Marche Polytechnic University, Ancona, Italy
| | - Giovanni Tossetta
- Department of Experimental and Clinical Medicine, Marche Polytechnic University, Ancona, Italy
| | - Ilenia Severi
- Department of Experimental and Clinical Medicine, Marche Polytechnic University, Ancona, Italy
| | - Federica Monaco
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
| | - Marcella Reguzzoni
- Department of Surgical and Morphological Sciences, University of Insubria, Varese, Italy
| | - Marco Tomasetti
- Department of Clinical and Molecular Sciences, Marche Polytechnic University, Ancona, Italy
| | - Christian Dani
- Université Côte d'Azur, CNRS, INSERM, iBV, Faculté de Médecine, Nice, France
| | - Saverio Cinti
- Department of Experimental and Clinical Medicine, Marche Polytechnic University, Ancona, Italy
- Center of Obesity, United Hospitals, Marche Polytechnic University, Ancona, Italy
| | - Antonio Giordano
- Department of Experimental and Clinical Medicine, Marche Polytechnic University, Ancona, Italy
- *Correspondence: Antonio Giordano
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13
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Jones SA, Jenkins BJ. Recent insights into targeting the IL-6 cytokine family in inflammatory diseases and cancer. Nat Rev Immunol 2018; 18:773-789. [DOI: 10.1038/s41577-018-0066-7] [Citation(s) in RCA: 435] [Impact Index Per Article: 72.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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14
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André C, Catania C, Remus-Borel J, Ladeveze E, Leste-Lasserre T, Mazier W, Binder E, Gonzales D, Clark S, Guzman-Quevedo O, Abrous DN, Layé S, Cota D. mTORC1 pathway disruption abrogates the effects of the ciliary neurotrophic factor on energy balance and hypothalamic neuroinflammation. Brain Behav Immun 2018; 70:325-334. [PMID: 29548998 DOI: 10.1016/j.bbi.2018.03.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 03/02/2018] [Accepted: 03/12/2018] [Indexed: 11/19/2022] Open
Abstract
Ciliary neurotrophic factor (CNTF) potently decreases food intake and body weight in diet-induced obese mice by acting through neuronal circuits and pathways located in the arcuate nucleus (ARC) of the hypothalamus. CNTF also exerts pro-inflammatory actions within the brain. Here we tested whether CNTF modifies energy balance by inducing inflammatory responses in the ARC and whether these effects depend upon the mechanistic target of rapamycin complex 1 (mTORC1) pathway, which regulates both energy metabolism and inflammation. To this purpose, chow- and high fat diet (HFD)- fed mice lacking the S6 kinase 1 (S6K1-/-), a downstream target of mTORC1, and their wild-type (WT) littermates received 12 days continuous intracerebroventricular (icv) infusion of the CNTF analogue axokine (CNTFAx15). Behavioral, metabolic and molecular effects were evaluated. Central chronic administration of CNTFAx15 decreased body weight and feed efficiency in WT mice only, when fed HFD, but not chow. These metabolic effects correlated with increased number of iba-1 positive microglia specifically in the ARC and were accompanied by significant increases of IL-1β and TNF-α mRNA expression in the hypothalamus. Hypothalamic iNOS and SOCS3 mRNA, molecular markers of pro-inflammatory response, were also increased by CNTFAx15. All these changes were absent in S6K1-/- mice. This study reveals that CNTFAx15 requires a functional S6K1 to modulate energy balance and hypothalamic inflammation in a diet-dependent fashion. Further investigations should determine whether S6K1 is a suitable target for the treatment of pathologies characterized by a high neuroinflammatory state.
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Affiliation(s)
- Caroline André
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Caterina Catania
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Julie Remus-Borel
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France; University of Bordeaux, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | - Elodie Ladeveze
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Thierry Leste-Lasserre
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Wilfrid Mazier
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Elke Binder
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Delphine Gonzales
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Samantha Clark
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Omar Guzman-Quevedo
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Djoher Nora Abrous
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France
| | - Sophie Layé
- INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France; University of Bordeaux, Nutrition et Neurobiologie Intégrée, UMR 1286, F-33076 Bordeaux, France
| | - Daniela Cota
- INSERM, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France; University of Bordeaux, Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U1215, F-33000 Bordeaux, France.
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15
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Cui MX, Yang LN, Wang XX, Wang L, Li RL, Han W, Wu YJ. Alleviative effect of ciliary neurotrophic factor analogue on high fat-induced hepatic steatosis is partially independent of the central regulation. Clin Exp Pharmacol Physiol 2017; 44:395-402. [PMID: 27973757 DOI: 10.1111/1440-1681.12709] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 11/30/2016] [Accepted: 12/03/2016] [Indexed: 12/21/2022]
Abstract
Ciliary neurotrophic factor (CNTF) analogues were reported to ameliorate fatty liver in db/db or high-fat diet-fed mice. It is generally thought that CNTF exerts its actions centrally. The aim of this study was to investigate whether peripheral effects of CNTF analogues are involved in the therapeutic effect on high fat-induced hepatic steatosis. The rat model of fatty liver was induced by a high-fat diet (HFD) for 12 weeks. In the next 2 weeks, rats were fed the HFD along with subcutaneous injection of vehicle or mutant recombinant human CNTF (rhmCNTF 0.05-0.2 mg/kg per day). Steatotic HepG2 cells were induced by 50% fetal bovine serum (FBS) for 48 hours, and then treated with rhmCNTF for 24 hours. The results showed that after rhmCNTF treatment, hepatic triglyceride (TG) accumulation was attenuated both in vivo and in vitro. RhmCNTF increased protein expression of CPT-1 and PPARα, and decreased SREBP-1c, FAS and SCD-1 in steatotic HepG2 cells. But the production of nitric oxide and 8-isoPGF2α in steatotic HepG2 cells was not affected by rhmCNTF. These results suggest that rhmCNTF has a peripheral effect that alleviates fat-induced hepatic steatosis.
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Affiliation(s)
- Ming-Xia Cui
- Institute of Pharmacology, School of Basic Medical Science, Lanzhou University, Lanzhou, China.,Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou, China
| | - Li-Ning Yang
- Institute of Pharmacology, School of Basic Medical Science, Lanzhou University, Lanzhou, China.,Gansu Provincial Second People's Hospital, Lanzhou, China
| | - Xiao-Xia Wang
- Institute of Pharmacology, School of Basic Medical Science, Lanzhou University, Lanzhou, China.,Shihua General Hospital of Lanzhou, Lanzhou, China
| | - Lei Wang
- Institute of Pharmacology, School of Basic Medical Science, Lanzhou University, Lanzhou, China.,Gansu Provincial Hospital, Lanzhou, China
| | - Rui-Lian Li
- Institute of Pharmacology, School of Basic Medical Science, Lanzhou University, Lanzhou, China.,Qinhai University, Xining, China
| | - Wei Han
- Dingxi District of Gansu University of Chinese Medicine, Dingxi, China
| | - Yong-Jie Wu
- Institute of Pharmacology, School of Basic Medical Science, Lanzhou University, Lanzhou, China.,Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou, China
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16
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You Y, Yuan X, Liu X, Liang C, Meng M, Huang Y, Han X, Guo J, Guo Y, Ren C, Zhang Q, Sun X, Ma T, Liu G, Jin W, Huang W, Zhan J. Cyanidin-3-glucoside increases whole body energy metabolism by upregulating brown adipose tissue mitochondrial function. Mol Nutr Food Res 2017; 61. [PMID: 28691397 DOI: 10.1002/mnfr.201700261] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Revised: 06/22/2017] [Accepted: 07/03/2017] [Indexed: 01/03/2023]
Abstract
SCOPE Obesity develops when energy intake exceeds energy expenditure. Promoting brown adipose tissue (BAT) formation and function increases energy expenditure and may protect against obesity. Cyanidin-3-glucoside (C3G) is an anthocyanin compound that occurs naturally in many fruits and vegetables. In this study, we investigated the effect and mechanism of C3G on the prevention of obesity. METHODS AND RESULTS Db/db mice received C3G dissolved in drinking water for 16 wk; drinking water served as the vehicle treatment. The total body weight, energy intake, metabolic rate, and physical activity were measured. The lipid droplets, gene expression and protein expression were evaluated by histochemical staining, real-time PCR, and western blots. We found that C3G increased energy expenditure, limited weight gain, maintained glucose homeostasis, reversed hepatic steatosis, improved cold tolerance, and enhanced BAT activity in obese db/db mice. C3G also induces brown-like adipocytes (beige) formation in subcutaneous white adipose tissue (sWAT) of db/db mice model. We also found that C3G potently regulates the transcription of uncoupling protein 1 (UCP1) both in BAT and sWAT through increasing mitochondrial number and function. CONCLUSION Our results suggest that C3G plays a role in regulating systemic energy balance, which may have potential therapeutic implications for the prevention and control of obesity.
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MESH Headings
- Adipogenesis
- Adipose Tissue, Brown/enzymology
- Adipose Tissue, Brown/metabolism
- Adipose Tissue, Brown/ultrastructure
- Adipose Tissue, White/enzymology
- Adipose Tissue, White/metabolism
- Adipose Tissue, White/pathology
- Animals
- Anthocyanins/therapeutic use
- Behavior, Animal
- Dietary Supplements
- Energy Intake
- Energy Metabolism
- Gene Expression Regulation
- Glucosides/therapeutic use
- Liver/enzymology
- Liver/metabolism
- Liver/pathology
- Locomotion
- Male
- Mice, Mutant Strains
- Microscopy, Electron, Transmission
- Mitochondria/enzymology
- Mitochondria/metabolism
- Mitochondria/ultrastructure
- Non-alcoholic Fatty Liver Disease/metabolism
- Non-alcoholic Fatty Liver Disease/pathology
- Non-alcoholic Fatty Liver Disease/prevention & control
- Obesity/metabolism
- Obesity/pathology
- Obesity/prevention & control
- Thermotolerance
- Uncoupling Protein 1/genetics
- Uncoupling Protein 1/metabolism
- Up-Regulation
- Whole Body Imaging
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Affiliation(s)
- Yilin You
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- College of Horticulture, China Agricultural University, Beijing, China
| | - Xiaoxue Yuan
- Institute of Infectious Diseases, Beijing Ditan Hospital, Beijing Key Laboratory of Emerging Infectious Diseases, Capital Medical University, Beijing, China
| | - Xiaomeng Liu
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- The University of the Chinese Academy of Sciences, Beijing, China
- Institute of Neuroscience and Translational Medicine, College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, China
| | - Chen Liang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- ARC Training Centre for Innovative Wine Production, The University of Adelaide, SA, Australia
| | - Minghui Meng
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Yuanyuan Huang
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- The University of the Chinese Academy of Sciences, Beijing, China
| | - Xue Han
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Jielong Guo
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Yu Guo
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Chenglong Ren
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Qianwen Zhang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Xiangyu Sun
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Tingting Ma
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- College of Food Engineering and Nutritional Science, Shanxi Normal University, Xi'an, China
| | - Guojie Liu
- College of Horticulture, China Agricultural University, Beijing, China
| | - Wanzhu Jin
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- The University of the Chinese Academy of Sciences, Beijing, China
| | - Weidong Huang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Jicheng Zhan
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
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17
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Chen FF, Wang JT, Zhang LX, Xing SF, Wang YX, Wang K, Deng SL, Zhang JQ, Tang L, Wu HS. Oleanolic acid derivative DKS26 exerts antidiabetic and hepatoprotective effects in diabetic mice and promotes glucagon-like peptide-1 secretion and expression in intestinal cells. Br J Pharmacol 2017. [PMID: 28627773 DOI: 10.1111/bph.13921] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND AND PURPOSE Glucagon-like peptide-1 (GLP-1) is an important target for diabetes therapy based on its key role in maintaining glucose and lipid homeostasis. This study was designed to investigate antidiabetic and hepatoprotective effects of a novel oleanolic acid derivative DKS26 in diabetic mice and elucidate its underlying GLP-1 related antidiabetic mechanisms in vitro and in vivo. EXPERIMENTAL APPROACH The therapeutic effects of DKS26 were investigated in streptozotocin (STZ)-induced and db/db diabetic mouse models. Levels of plasma glucose, glycosylated serum protein (GSP), lipid profiles, insulin, alanine aminotransferase (ALT) and aspartate aminotransferase (AST), oral glucose tolerance (OGT), pancreatic islets and hepatic histopathological morphology, liver lipid levels and expression of pro-inflammatory cytokines were assessed. Intestinal NCI-H716 cells and diabetic models were used to further validate its potential GLP-1-related antidiabetic mechanisms. KEY RESULTS DKS26 treatment (100 mg·kg-1 ·day-1 ) decreased plasma levels of glucose, GSP, ALT and AST; ameliorated OGT and plasma lipid profiles; augmented plasma insulin levels; alleviated islets and hepatic pathological morphology; and reduced liver lipid accumulation, inflammation and necrosis in vivo. Furthermore, DKS26 enhanced GLP-1 release and expression, accompanied by elevated levels of cAMP and phosphorylated PKA in vitro and in vivo. CONCLUSION AND IMPLICATIONS DKS26 exerted hypoglycaemic, hypolipidaemic and islets protective effects, which were associated with an enhanced release and expression of GLP-1 mediated by the activation of the cAMP/PKA signalling pathway, and alleviated hepatic damage by reducing liver lipid levels and inflammation. These findings firmly identified DKS26 as a new viable therapeutic option for diabetes control.
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Affiliation(s)
- Fei-Fei Chen
- Experiment Education Center for Pharmaceutical Sciences, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China.,Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Jian-Ta Wang
- College of Pharmacy, Guizhou Medical University, Guiyang, China
| | - Li-Xia Zhang
- Experiment Education Center for Pharmaceutical Sciences, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Shu-Fang Xing
- Experiment Education Center for Pharmaceutical Sciences, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Yun-Xia Wang
- Experiment Education Center for Pharmaceutical Sciences, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Kai Wang
- Experiment Education Center for Pharmaceutical Sciences, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Shu-Li Deng
- Department of Conservative Dentistry, Affiliated Hospital of Stomatology, Zhejiang University, Hangzhou, China
| | - Ji-Quan Zhang
- College of Pharmacy, Guizhou Medical University, Guiyang, China
| | - Lei Tang
- College of Pharmacy, Guizhou Medical University, Guiyang, China
| | - Hao-Shu Wu
- Experiment Education Center for Pharmaceutical Sciences, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China.,Institute of Pharmacology & Toxicology, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
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18
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Cui MX, Jiang JF, Min GN, Han W, Wu YJ. Ciliary neurotrophic factor analogue aggravates CCl 4-induced acute hepatic injury in rats. Can J Physiol Pharmacol 2016; 95:620-623. [PMID: 28177690 DOI: 10.1139/cjpp-2016-0564] [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: 12/11/2022]
Abstract
Ciliary neurotrophic factor (CNTF) and CNTF analogs were reported to have hepatoprotective effect and ameliorate hepatic steatosis in db/db or high-fat-diet-fed mice. Because hepatic steatosis and injury are also commonly induced by hepatotoxin, the aim of the present study is to clarify whether CNTF could alleviate hepatic steatosis and injury induced by carbon tetrachloride (CCl4). Unexpectedly, when combined with CCl4, CNTF aggravated hepatic steatosis and liver injury. The mechanism is associated with effects of CNTF that inhibited lipoprotein secretion and drastically impaired the ability of lipoproteins to act as transport vehicles for lipids from the liver to the circulation. While injected after CCl4 cessation, CNTF could improve liver function. These data suggest that CNTF could be a potential hepatoprotective agent against CCl4-induced hepatic injury after the cessation of CCl4 exposure. However, it is forbidden to combine recombinant mutant of human CNTF treatment with CCl4.
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Affiliation(s)
- Ming-Xia Cui
- a Institute of Pharmacology, School of Basic Medical Science, Lanzhou University; Key Laboratory of Preclinical Study for New Drug of Gansu Province, Lanzhou 730000, China
| | - Jun-Feng Jiang
- b Gansu Provincial Cancer Hospital, Lanzhou 730050, China
| | - Guang-Ning Min
- c The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Wei Han
- d Dingxi District of Gansu University of Chinese Medicine, Dingxi 743000, China
| | - Yong-Jie Wu
- a Institute of Pharmacology, School of Basic Medical Science, Lanzhou University; Key Laboratory of Preclinical Study for New Drug of Gansu Province, Lanzhou 730000, China
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19
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Yuan X, Wei G, You Y, Huang Y, Lee HJ, Dong M, Lin J, Hu T, Zhang H, Zhang C, Zhou H, Ye R, Qi X, Zhai B, Huang W, Liu S, Xie W, Liu Q, Liu X, Cui C, Li D, Zhan J, Cheng J, Yuan Z, Jin W. Rutin ameliorates obesity through brown fat activation. FASEB J 2016; 31:333-345. [PMID: 28049156 DOI: 10.1096/fj.201600459rr] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 09/28/2016] [Indexed: 11/11/2022]
Abstract
Increasing energy expenditure through activation of brown adipose tissue (BAT) is a critical approach to treating obesity and diabetes. In this study, rutin, a natural compound extracted from mulberry and a drug used as a capillary stabilizer clinically for many years without any side effects, regulated whole-body energy metabolism by enhancing BAT activity. Rutin treatment significantly reduced adiposity, increased energy expenditure, and improved glucose homeostasis in both genetically obese (Db/Db) and diet-induced obesity (DIO) mice. Rutin also induced brown-like adipocyte (beige) formation in subcutaneous adipose tissue in both obesity mouse models. Mechanistically, we found that rutin directly bound to and stabilized SIRT1, leading to hypoacetylation of peroxisome proliferator-activated receptor γ coactivator-1α protein, which stimulated Tfam transactivation and eventually augmented the number of mitochondria and UCP1 activity in BAT. These findings reveal that rutin is a novel small molecule that activates BAT and may provide a novel therapeutic approach to the treatment of metabolic disorders.-Yuan, X., Wei, G., You, Y., Huang, Y., Lee, H. J., Dong, M., Lin, J., Hu, T., Zhang, H., Zhang, C., Zhou, H., Ye, R., Qi, X., Zhai, B., Huang, W., Liu, S., Xie, W., Liu, Q., Liu, X., Cui, C., Li, D., Zhan, J., Cheng, J., Yuan, Z., Jin, W. Rutin ameliorates obesity through brown fat activation.
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Affiliation(s)
- Xiaoxue Yuan
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Gang Wei
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Yilin You
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Yuanyuan Huang
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Hyuek Jong Lee
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Meng Dong
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Jun Lin
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Tao Hu
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Hanlin Zhang
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Chuanhai Zhang
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Huiqiao Zhou
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Rongcai Ye
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,The University of the Chinese Academy of Sciences, Beijing, China
| | - Xiaolong Qi
- The University of the Chinese Academy of Sciences, Beijing, China.,State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Baiqiang Zhai
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Weidong Huang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Shunai Liu
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Wen Xie
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Qingsong Liu
- High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, China
| | - Xiaomeng Liu
- College of Life Sciences, Zhoukou Normal University, Henan, China; and
| | - Chengbi Cui
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Yanbian University, Yanji, China
| | - Donghao Li
- Key Laboratory of Natural Resources of Changbai Mountain and Functional Molecules, Ministry of Education, Yanbian University, Yanji, China
| | - Jicheng Zhan
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Jun Cheng
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Zengqiang Yuan
- The University of the Chinese Academy of Sciences, Beijing, China; .,State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Wanzhu Jin
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China;
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20
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Abstract
Recent studies indicate that dietary interventions have the potential to prevent and even treat cardiovascular disease, which is the leading cause of death. Many of these studies have focused on various animal models that are able to recreate one or more conditions or elevate risk factors that characterize the disease. Here, we highlight macronutrient-focused interventions in both mammalian model organisms and humans with emphasis on some of the most relevant and well-established diets known to be associated with cardiovascular disease prevention and treatment. We also discuss more recent dietary interventions in rodents, monkeys, and humans, which affect atherosclerosis and cardiovascular diseases with focus on those that also delay aging.
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21
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Borg ML, Reichenbach A, Lemus M, Oldfield BJ, Andrews ZB, Watt MJ. Central Administration of the Ciliary Neurotrophic Factor Analogue, Axokine, Does Not Play a Role in Long-Term Energy Homeostasis in Adult Mice. Neuroendocrinology 2016; 103:223-9. [PMID: 26088805 DOI: 10.1159/000435860] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 06/10/2015] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS Ciliary neurotrophic factor (CNTF) exerts powerful anorectic effects and has been suggested to regulate long-term energy balance by inducing adult neurogenesis in the arcuate nucleus of the hypothalamus. METHODS The CNTF analogue, Axokine, was infused into the lateral ventricle of high-fat-fed mice for 1 week. Food intake, energy expenditure, body mass, glucose metabolism, and neurogenesis in the arcuate nucleus (ARC) of the hypothalamus were assessed 3 weeks after cessation of Axokine treatment. RESULTS Short-term administration of Axokine induced an anorexic response but did not promote sustained weight loss. Instead, a rapid rebound in food intake and body mass occurred immediately after cessation of Axokine treatment, and this tended to reduce insulin sensitivity. Immunolabeling of 5-bromo-2'-deoxyuridine revealed limited neurogenesis in the ARC 3 weeks after Axokine treatment. CONCLUSION These findings suggest that Axokine/CNTF does not induce substantial or sustained ARC neurogenesis or contribute to the long-term regulation of energy balance in mice.
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Affiliation(s)
- Melissa L Borg
- Department of Physiology, Monash University, Clayton, Vic., Australia
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22
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Elks CM, Stephens JM. Oncostatin m modulation of lipid storage. BIOLOGY 2015; 4:151-60. [PMID: 25689119 PMCID: PMC4381222 DOI: 10.3390/biology4010151] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/29/2015] [Accepted: 02/11/2015] [Indexed: 02/02/2023]
Abstract
Oncostatin M (OSM) is a cytokine belonging to the gp130 family, whose members serve pleiotropic functions. However, several actions of OSM are unique from those of other gp130 cytokines, and these actions may have critical roles in inflammatory mechanisms influencing several metabolic and biological functions of insulin-sensitive tissues. In this review, the actions of OSM in adipose tissue and liver are discussed, with an emphasis on lipid metabolism.
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Affiliation(s)
- Carrie M Elks
- Adipocyte Biology Laboratory, Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808, USA.
| | - Jacqueline M Stephens
- Adipocyte Biology Laboratory, Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808, USA.
- Department of Biological Sciences, Louisiana State University, 202 Life Sciences Building, Baton Rouge, LA 70803, USA.
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23
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Singh AK, Joharapurkar AA, Khan MP, Mishra JS, Singh N, Yadav M, Hossain Z, Khan K, Kumar S, Dhanesha NA, Mishra DP, Maurya R, Sharma S, Jain MR, Trivedi AK, Godbole MM, Gayen JR, Chattopadhyay N, Sanyal S. Orally active osteoanabolic agent GTDF binds to adiponectin receptors, with a preference for AdipoR1, induces adiponectin-associated signaling, and improves metabolic health in a rodent model of diabetes. Diabetes 2014; 63:3530-44. [PMID: 24848063 DOI: 10.2337/db13-1619] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Adiponectin is an adipocytokine that signals through plasma membrane-bound adiponectin receptors 1 and 2 (AdipoR1 and -2). Plasma adiponectin depletion is associated with type 2 diabetes, obesity, and cardiovascular diseases. Adiponectin therapy, however, is yet unavailable owing to its large size, complex multimerization, and functional differences of the multimers. We report discovery and characterization of 6-C-β-D-glucopyranosyl-(2S,3S)-(+)-5,7,3',4'-tetrahydroxydihydroflavonol (GTDF) as an orally active adiponectin mimetic. GTDF interacted with both AdipoRs, with a preference for AdipoR1. It induced adiponectin-associated signaling and enhanced glucose uptake and fatty acid oxidation in vitro, which were augmented or abolished by AdipoR1 overexpression or silencing, respectively. GTDF improved metabolic health, characterized by elevated glucose clearance, β-cell survival, reduced steatohepatitis, browning of white adipose tissue, and improved lipid profile in an AdipoR1-expressing but not an AdipoR1-depleted strain of diabetic mice. The discovery of GTDF as an adiponectin mimetic provides a promising therapeutic tool for the treatment of metabolic diseases.
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Affiliation(s)
- Abhishek Kumar Singh
- Biochemistry Division, Council of Scientific and Industrial Research-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | | | - Mohd Parvez Khan
- Division of Endocrinology, CSIR-CDRI, Lucknow, Uttar Pradesh, India
| | - Jay Sharan Mishra
- Biochemistry Division, Council of Scientific and Industrial Research-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | - Nidhi Singh
- Biochemistry Division, Council of Scientific and Industrial Research-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | - Manisha Yadav
- Biochemistry Division, Council of Scientific and Industrial Research-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | - Zakir Hossain
- Division of Phramacokinetics, CSIR-CDRI, Lucknow, Uttar Pradesh, India
| | - Kainat Khan
- Division of Endocrinology, CSIR-CDRI, Lucknow, Uttar Pradesh, India
| | - Sudhir Kumar
- Division of Medicinal and Process Chemistry, CSIR-CDRI, Lucknow, Uttar Pradesh, India
| | | | | | - Rakesh Maurya
- Division of Medicinal and Process Chemistry, CSIR-CDRI, Lucknow, Uttar Pradesh, India
| | - Sharad Sharma
- Division of Toxicology, CSIR-CDRI, Lucknow, Uttar Pradesh, India
| | | | - Arun Kumar Trivedi
- Biochemistry Division, Council of Scientific and Industrial Research-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
| | - Madan Madhav Godbole
- Department of Molecular Medicine, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | | | | | - Sabyasachi Sanyal
- Biochemistry Division, Council of Scientific and Industrial Research-Central Drug Research Institute (CSIR-CDRI), Lucknow, Uttar Pradesh, India
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24
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Dozier JK, Khatwani SL, Wollack JW, Wang YC, Schmidt-Dannert C, Distefano MD. Engineering protein farnesyltransferase for enzymatic protein labeling applications. Bioconjug Chem 2014; 25:1203-12. [PMID: 24946229 PMCID: PMC4103756 DOI: 10.1021/bc500240p] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Creating covalent protein conjugates is an active area of research due to the wide range of uses for protein conjugates spanning everything from biological studies to protein therapeutics. Protein Farnesyltransferase (PFTase) has been used for the creation of site-specific protein conjugates, and a number of PFTase substrates have been developed to facilitate that work. PFTase is an effective catalyst for protein modification because it transfers Farnesyl diphosphate (FPP) analogues to protein substrates on a cysteine four residues from the C-terminus. While much work has been done to synthesize various FPP analogues, there are few reports investigating how mutations in PFTase alter the kinetics with these unnatural analogues. Herein we examined how different mutations within the PFTase active site alter the kinetics of the PFTase reaction with a series of large FPP analogues. We found that mutating either a single tryptophan or tyrosine residue to alanine results in greatly improved catalytic parameters, particularly in kcat. Mutation of tryptophan 102β to alanine caused a 4-fold increase in kcat and a 10-fold decrease in KM for a benzaldehyde-containing FPP analogue resulting in an overall 40-fold increase in catalytic efficiency. Similarly, mutation of tyrosine 205β to alanine caused a 25-fold increase in kcat and a 10-fold decrease in KM for a coumarin-containing analogue leading to a 300-fold increase in catalytic efficiency. Smaller but significant changes in catalytic parameters were also obtained for cyclo-octene- and NBD-containing FPP analogues. The latter compound was used to create a fluorescently labeled form of Ciliary Neurotrophic Factor (CNTF), a protein of therapeutic importance. Additionally, computational modeling was performed to study how the large non-natural isoprenoid analogues can fit into the active sites enlarged via mutagenesis. Overall, these results demonstrate that PFTase can be improved via mutagenesis in ways that will be useful for protein engineering and the creation of site-specific protein conjugates.
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Affiliation(s)
- Jonathan K Dozier
- Department of Chemistry, University of Minnesota , Minneapolis, Minnesota 55455, United States
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25
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Sanchez-Infantes D, White UA, Elks CM, Morrison RF, Gimble JM, Considine RV, Ferrante AW, Ravussin E, Stephens JM. Oncostatin m is produced in adipose tissue and is regulated in conditions of obesity and type 2 diabetes. J Clin Endocrinol Metab 2014; 99:E217-25. [PMID: 24297795 PMCID: PMC3913819 DOI: 10.1210/jc.2013-3555] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
CONTEXT Adipose tissue is a highly active endocrine organ that secretes many factors that affect other tissues and whole-body metabolism. Adipocytes are responsive to several glycoprotein 130 (gp130) cytokines, some of which have been targeted as potential antiobesity therapeutics. OBJECTIVE Oncostatin M (OSM) is a gp130 family member known to inhibit adipocyte differentiation in vitro, but its effects on other adipocyte properties are not characterized. The expression of OSM in white adipose tissue (WAT) has not been evaluated in the context of obesity. Thus, our objective was to examine the expression of adipose tissue OSM in obese animals and humans. DESIGN OSM expression was examined in adipose tissues from mice with diet-induced and genetic obesity and in obese humans as well as in fractionated adipose tissue from mice. Murine adipocytes were used to examine OSM receptor expression and the effects of OSM on adipocytes, including the secretion of factors such as plasminogen activator inhibitor 1 and IL-6, which are implicated in metabolic diseases. RESULTS OSM expression is increased in rodent and human obesity/type 2 diabetes mellitus. In humans, OSM levels correlate with body weight and insulin and are inversely correlated with glucose disposal rate as measured by hyperinsulinemic-euglycemic clamp. OSM is not produced from the adipocytes in WAT but derives from cells in the stromovascular fraction, including F4/80(+) macrophages. The specific receptor of OSM, OSM receptor-β, is expressed in adipocytes and adipose tissue and increased in both rodent models of obesity examined. OSM acts on adipocytes to induce the expression and secretion of plasminogen activator inhibitor 1 and IL-6. CONCLUSIONS These data indicate that WAT macrophages are a source of OSM and that OSM levels are significantly induced in murine and human obesity/type 2 diabetes mellitus. These studies suggest that OSM produced from immune cells in WAT acts in a paracrine manner on adipocytes to promote a proinflammatory phenotype in adipose tissue.
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Affiliation(s)
- David Sanchez-Infantes
- Pennington Biomedical Research Center (D.S.-I., U.A.W., C.M.E., J.M.G., E.R., J.M.S.) and Department of Biological Sciences (J.M.S.), Louisiana State University, Baton Rouge, Louisiana 70808; Department of Nutrition (R.F.M.), UNC-Greensboro, Greensboro, North Carolina 24702; Indiana University School of Medicine (R.V.C.), Indianapolis, Indiana 46202; Department of Medicine (A.W.F.), Columbia University, New York, New York 10032; and Endocrinology Department (D.S.-I.), St Joan de Deu, 08950 Barcelona, Spain
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26
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Abstract
Complex interactions between the brain and peripheral tissues mediate the effective control of energy balance and body weight. Hypothalamic and hindbrain neural circuits integrate peripheral signals informing the nutritional status of the animal and in response regulate nutrient intake and energy utilization. Obesity and its many medical complications emerge from the dysregulation of energy homeostasis. Excessive weight gain might also arise from alterations in reward systems of the brain that drive consumption of calorie dense, palatable foods in the absence of an energy requirement. Several neurotrophins, most notably brain-derived neurotrophic factor, have been implicated in the molecular and cellular processes underlying body weight regulation. Here, we review investigations interrogating their roles in energy balance and reward centers of the brain impacting feeding behavior and energy expenditure.
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Affiliation(s)
- M Rios
- Department of Neuroscience, Tufts University School of Medicine, Boston, MA, 02111, USA,
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27
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Baeyens L, Lemper M, Leuckx G, De Groef S, Bonfanti P, Stangé G, Shemer R, Nord C, Scheel DW, Pan FC, Ahlgren U, Gu G, Stoffers DA, Dor Y, Ferrer J, Gradwohl G, Wright CVE, Van de Casteele M, German MS, Bouwens L, Heimberg H. Transient cytokine treatment induces acinar cell reprogramming and regenerates functional beta cell mass in diabetic mice. Nat Biotechnol 2014; 32:76-83. [PMID: 24240391 PMCID: PMC4096987 DOI: 10.1038/nbt.2747] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 10/15/2013] [Indexed: 12/20/2022]
Abstract
Reprogramming of pancreatic exocrine cells into cells resembling beta cells may provide a strategy for treating diabetes. Here we show that transient administration of epidermal growth factor and ciliary neurotrophic factor to adult mice with chronic hyperglycemia efficiently stimulates the conversion of terminally differentiated acinar cells to beta-like cells. Newly generated beta-like cells are epigenetically reprogrammed, functional and glucose responsive, and they reinstate normal glycemic control for up to 248 d. The regenerative process depends on Stat3 signaling and requires a threshold number of Neurogenin 3 (Ngn3)-expressing acinar cells. In contrast to previous work demonstrating in vivo conversion of acinar cells to beta-like cells by viral delivery of exogenous transcription factors, our approach achieves acinar-to-beta-cell reprogramming through transient cytokine exposure rather than genetic modification.
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Affiliation(s)
- Luc Baeyens
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
- Diabetes Center, California Institute for Regenerative Medicine (CIRM), University of California San Francisco, San Francisco, CA 94143-0669, USA
| | - Marie Lemper
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
| | - Gunter Leuckx
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
| | - Sofie De Groef
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
| | - Paola Bonfanti
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
| | - Geert Stangé
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
| | - Ruth Shemer
- The Institute for Medical Research Israel-Canada, The Hebrew University, Jerusalem, Israel
| | - Christoffer Nord
- Umeå Center for Molecular Medicine, Umeå University, S-901 87 Umeå, Sweden
| | - David W. Scheel
- Diabetes Center, California Institute for Regenerative Medicine (CIRM), University of California San Francisco, San Francisco, CA 94143-0669, USA
| | - Fong C. Pan
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Ulf Ahlgren
- Umeå Center for Molecular Medicine, Umeå University, S-901 87 Umeå, Sweden
| | - Guoqiang Gu
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Doris A. Stoffers
- Institute for Diabetes, Obesity, and Metabolism, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
| | - Yuval Dor
- The Institute for Medical Research Israel-Canada, The Hebrew University, Jerusalem, Israel
| | - Jorge Ferrer
- Institut d’Investigacions Biomediques August Pi i Sunyer, Hospital Clinic de Barcelona, Barcelona, Spain and Imperial College London, London W12 0NN, United Kingdom
| | - Gerard Gradwohl
- Development and Stem Cells Program, Institute of Genetics and Molecular and Cellular Biology (IGBMC), Illkirch, 67404, France
| | - Christopher VE Wright
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | | | - Michael S. German
- Diabetes Center, California Institute for Regenerative Medicine (CIRM), University of California San Francisco, San Francisco, CA 94143-0669, USA
| | - Luc Bouwens
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
| | - Harry Heimberg
- Diabetes Research Center, Vrije Universiteit Brussel, 1090 Brussels, Belgium
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Severi I, Perugini J, Mondini E, Smorlesi A, Frontini A, Cinti S, Giordano A. Opposite effects of a high-fat diet and calorie restriction on ciliary neurotrophic factor signaling in the mouse hypothalamus. Front Neurosci 2013; 7:263. [PMID: 24409114 PMCID: PMC3873503 DOI: 10.3389/fnins.2013.00263] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Accepted: 12/16/2013] [Indexed: 12/05/2022] Open
Abstract
In the mouse hypothalamus, ciliary neurotrophic factor (CNTF) is mainly expressed by ependymal cells and tanycytes of the ependymal layer covering the third ventricle. Since exogenously administered CNTF causes reduced food intake and weight loss, we tested whether endogenous CNTF might be involved in energy balance regulation. We thus evaluated CNTF production and responsiveness in the hypothalamus of mice fed a high-fat diet (HFD), of ob/ob obese mice, and of mice fed a calorie restriction (CR) regimen. RT-PCR showed that CNTF mRNA increased significantly in HFD mice and decreased significantly in CR animals. Western blotting confirmed that CNTF expression was higher in HFD mice and reduced in CR mice, but high interindividual variability blunted the significance of these differences. By immunohistochemistry, hypothalamic tuberal and mammillary region tanycytes stained strongly for CNTF in HFD mice, whereas CR mice exhibited markedly reduced staining. RT-PCR and Western blotting disclosed that changes in CNTF expression were paralleled by changes in the expression of its specific receptor, CNTF receptor α (CNTFRα). Injection of recombinant CNTF and detection of phospho-signal transducer and activator of transcription 3 (P-STAT3) showed that CNTF responsiveness by the ependymal layer, mainly by tanycytes, was higher in HFD than CR mice. In addition, in HFD mice CNTF administration induced distinctive STAT3 signaling in a large neuron population located in the dorsomedial and ventromedial nuclei, perifornical area and mammillary body. The hypothalamic expression of CNTF and CNTFRα did not change in the hyperphagic, leptin-deficient ob/ob obese mice; accordingly, P-STAT3 immunoreactivity in CNTF-treated ob/ob mice was confined to ependymal layer and arcuate neurons. Collectively, these data suggest that hypothalamic CNTF is involved in controlling the energy balance and that CNTF signaling plays a role in HFD obese mice at specific sites.
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Affiliation(s)
- Ilenia Severi
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, Università Politecnica delle Marche Ancona, Italy
| | - Jessica Perugini
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, Università Politecnica delle Marche Ancona, Italy
| | - Eleonora Mondini
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, Università Politecnica delle Marche Ancona, Italy
| | - Arianna Smorlesi
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, Università Politecnica delle Marche Ancona, Italy
| | - Andrea Frontini
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, Università Politecnica delle Marche Ancona, Italy
| | - Saverio Cinti
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, Università Politecnica delle Marche Ancona, Italy ; Center of Obesity, Università Politecnica delle Marche-United Hospitals Ancona, Italy
| | - Antonio Giordano
- Department of Experimental and Clinical Medicine, Section of Neuroscience and Cell Biology, Università Politecnica delle Marche Ancona, Italy
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Wang G, Xu X, Yao X, Zhu Z, Yu L, Chen L, Chen J, Shen X. Latanoprost effectively ameliorates glucose and lipid disorders in db/db and ob/ob mice. Diabetologia 2013; 56:2702-12. [PMID: 23989723 DOI: 10.1007/s00125-013-3032-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Accepted: 07/22/2013] [Indexed: 01/14/2023]
Abstract
AIMS/HYPOTHESIS Improvement of glucose and lipid metabolic dysfunctions is a potent therapeutic strategy against type 2 diabetes mellitus, and identifying new functions for existing drugs may help accelerate the speed of new drug development. Here, we report that latanoprost, a clinical drug for treating primary open-angle glaucoma and intraocular hypertension, effectively ameliorated glucose and lipid disorders in two mouse models of type 2 diabetes. In addition, the glucose-lowering mechanisms of latanoprost were intensively investigated. METHODS A binding-affinity assay and enzymatic tests were used to determine the targets of latanoprost. Cell-based assays on 3T3-L1 adipocytes and C2C12 myotubes and animal model-based assays with db/db and ob/ob mice were further performed to clarify the mechanisms underlying latanoprost-regulated glucose and lipid metabolism. RESULTS Latanoprost functioned as both an indirect activator of AMP-activated protein kinase and a selective retinoid X receptor α (RXRα) antagonist able to selectively antagonise the transcription of a RXRα/peroxisome proliferator-activated receptor γ heterodimer. It promoted glucose uptake, inhibited pre-adipocyte differentiation and regulated the main genes responsible for glucose and lipid metabolism, including Fas, Scd1, Perilipin (also known as Plin1), Lpl and Pdk4. Chronic administration of latanoprost in mice potently decreased the levels of fasting blood glucose, HbA1c, fructosamine (FMN), NEFA and total cholesterol, and effectively improved glucose tolerance and glucose/lipid metabolism-related genes in vivo. CONCLUSIONS/INTERPRETATION Our studies demonstrate that the existing eye drug latanoprost is both an indirect activator of AMP-activated protein kinase and a selective RXRα antagonist. Latanoprost effectively ameliorated glucose and lipid disorders in diabetic mice, which strongly highlights the potential of latanoprost in the treatment of type 2 diabetes mellitus.
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Affiliation(s)
- Gaihong Wang
- Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, People's Republic of China
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30
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The cytokines cardiotrophin-like cytokine/cytokine-like factor-1 (CLC/CLF) and ciliary neurotrophic factor (CNTF) differ in their receptor specificities. Cytokine 2012; 60:653-60. [DOI: 10.1016/j.cyto.2012.08.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 08/09/2012] [Accepted: 08/15/2012] [Indexed: 01/26/2023]
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31
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Rezende LF, Santos GJ, Carneiro EM, Boschero AC. Ciliary neurotrophic factor protects mice against streptozotocin-induced type 1 diabetes through SOCS3: the role of STAT1/STAT3 ratio in β-cell death. J Biol Chem 2012; 287:41628-39. [PMID: 23038263 DOI: 10.1074/jbc.m112.358788] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Type 1 diabetes is characterized by a loss of islet β-cells. Ciliary neurotrophic factor (CNTF) protects pancreatic islets against cytokine-induced apoptosis. For this reason, we assessed whether CNTF protects mice against streptozotocin-induced diabetes (a model of type 1 diabetes) and the mechanism for this protection. WT and SOCS3 knockdown C57BL6 mice were treated for 5 days with citrate buffer or 0.1 mg/kg CNTF before receiving 80 mg/kg streptozotocin. Glycemia in non-fasted mice was measured weekly from days 0-28 after streptozotocin administration. Diabetes was defined as a blood glucose > 11.2 mmol/liter. Wild-type (WT) and SOCS3 knockdown MIN6 cells were cultured with CNTF, IL1β, or both. CNTF reduced diabetes incidence and islet apoptosis in WT but not in SOCS3kd mice. Likewise, CNTF inhibited apoptosis in WT but not in SOCS3kd MIN6 cells. CNTF increased STAT3 phosphorylation in WT and SOCS3kd mice and MIN6 cells but reduced STAT1 phosphorylation only in WT mice, in contrast to streptozotocin and IL1β. Moreover, CNTF reduced NFκB activation and required down-regulation of inducible NO synthase expression to exert its protective effects. In conclusion, CNTF protects mice against streptozotocin-induced diabetes by increasing pancreatic islet survival, and this protection depends on SOCS3. In addition, SOCS3 expression and β-cell fate are dependent on STAT1/STAT3 ratio.
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Affiliation(s)
- Luiz F Rezende
- Department of Structural and Functional Biology Institute of Biology State University of Campinas (UNICAMP), P.O. Box 6109, Campinas, Sao Paulo 13083-865, Brazil.
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32
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Abstract
A growing number of studies have shown that a diet high in long chain SFA and/or obesity cause profound changes to the energy balance centres of the hypothalamus which results in the loss of central leptin and insulin sensitivity. Insensitivity to these important anorexigenic messengers of nutritional status perpetuates the development of both obesity and peripheral insulin insensitivity. A high-fat diet induces changes in the hypothalamus that include an increase in markers of oxidative stress, inflammation, endoplasmic reticulum (ER) stress, autophagy defect and changes in the rate of apoptosis and neuronal regeneration. In addition, a number of mechanisms have recently come to light that are important in the hypothalamic control of energy balance, which could play a role in perpetuating the effect of a high-fat diet on hypothalamic dysfunction. These include: reactive oxygen species as an important second messenger, lipid metabolism, autophagy and neuronal and synaptic plasticity. The importance of nutritional activation of the Toll-like receptor 4 and the inhibitor of NF-κB kinase subunit β/NK-κB and c-Jun amino-terminal kinase 1 inflammatory pathways in linking a high-fat diet to obesity and insulin insensitivity via the hypothalamus is now widely recognised. All of the hypothalamic changes induced by a high-fat diet appear to be causally linked and inhibitors of inflammation, ER stress and autophagy defect can prevent or reverse the development of obesity pointing to potential drug targets in the prevention of obesity and metabolic dysfunction.
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33
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Good DJ. Extending the reach of Exendin-4: new pathways in the control of body weight and glucose homeostasis. Endocrinology 2012; 153:2051-3. [PMID: 22523329 PMCID: PMC3339655 DOI: 10.1210/en.2012-1149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 02/29/2012] [Indexed: 12/11/2022]
Affiliation(s)
- Deborah J Good
- Department of Human Nutrition, Foods and Exercise, Virginia Tech, Blacksburg, Virginia 24061, USA.
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34
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Rezende LF, Santos GJ, Santos-Silva JC, Carneiro EM, Boschero AC. Ciliary neurotrophic factor (CNTF) protects non-obese Swiss mice against type 2 diabetes by increasing beta cell mass and reducing insulin clearance. Diabetologia 2012; 55:1495-504. [PMID: 22349107 DOI: 10.1007/s00125-012-2493-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Accepted: 01/19/2012] [Indexed: 12/14/2022]
Abstract
AIMS/HYPOTHESIS Ciliary neurotrophic factor (CNTF) improves metabolic variables of obese animals with characteristics of type 2 diabetes, mainly by reducing insulin resistance. We evaluated whether CNTF was able to improve other metabolic variables in mouse models of type 2 diabetes, such as beta cell mass and insulin clearance, and whether CNTF has any effect on non-obese mice with characteristics of type 2 diabetes. METHODS Neonatal mice were treated with 0.1 mg/kg CNTF or citrate buffer via intraperitoneal injections, before injection of 250 mg/kg alloxan. HEPG2 cells were cultured for 3 days in the presence of citrate buffer, 1 nmol/l CNTF or 50 mmol/l alloxan or a combination of CNTF and alloxan. Twenty-one days after treatment, we determined body weight, epididymal fat weight, blood glucose, plasma insulin, NEFA, glucose tolerance, insulin resistance, insulin clearance and beta cell mass. Finally, we assessed insulin receptor and protein kinase B phosphorylation in peripheral organs, as well as insulin-degrading enzyme (IDE) protein production and alternative splicing in the liver and HEPG2 cells. RESULTS CNTF improved insulin sensitivity and beta cell mass, while reducing glucose-stimulated insulin secretion and insulin clearance in Swiss mice, improving glucose handling in a non-obese type 2 diabetes model. This effect was associated with lower IDE production and activity in liver cells. All these effects were observed even at 21 days after CNTF treatment. CONCLUSIONS/INTERPRETATION CNTF protection against type 2 diabetes is partially independent of the anti-obesity actions of CNTF, requiring a reduction in insulin clearance and increased beta cell mass, besides increased insulin sensitivity. Furthermore, knowledge of the long-term effects of CNTF expands its pharmacological relevance.
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Affiliation(s)
- L F Rezende
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, PO Box 6109, Campinas, SP CEP 13083-865, Brazil.
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35
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Liu Y, Zhou D, Zhang F, Tu Y, Xia Y, Wang H, Zhou B, Zhang Y, Wu J, Gao X, He Z, Zhai Q. Liver Patt1 deficiency protects male mice from age-associated but not high-fat diet-induced hepatic steatosis. J Lipid Res 2012; 53:358-367. [PMID: 22231784 DOI: 10.1194/jlr.m019257] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Patt1 is a newly identified protein acetyltransferase that is highly expressed in liver. However, the role of Patt1 in liver is still unclear. We generated Patt1 liver-specific knockout (LKO) mice and mainly measured the effect of hepatic Patt1 deficiency on lipid metabolism. Hepatic Patt1 deficiency in male mice markedly decreases fat mass and dramatically alleviates age-associated accumulation of lipid droplets in liver. Moreover, hepatic Patt1 abrogation in male mice significantly reduces the liver triglyceride and free fatty acid levels, but it has no effect on liver cholesterol level, liver weight, and liver function. Consistently, primary cultured Patt1-deficient hepatocytes are resistant to palmitic acid-induced lipid accumulation, but hepatic Patt1 deficiency fails to protect male mice from high-fat diet-induced hepatic steatosis. Further studies show that hepatic Patt1 deficiency decreases fatty acid uptake, reduces lipid synthesis, and enhances fatty acid oxidation, which may contribute to the attenuated hepatic steatosis in Patt1 LKO mice. These results demonstrate that Patt1 plays an important role in hepatic lipid metabolism and have implications toward resolving age-associated hepatic steatosis.
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Affiliation(s)
- Yang Liu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Daizhan Zhou
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Fang Zhang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Yanyang Tu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Yulei Xia
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Hui Wang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Ben Zhou
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Yi Zhang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Jingxia Wu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Xiang Gao
- Model Animal Research Center, Nanjing University, Nanjing 210061, China
| | - Zhishui He
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and
| | - Qiwei Zhai
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Science; Graduate School of the Chinese Academy of Science; Shanghai 200031, China; and.
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Santos GJ, Oliveira CA, Boschero AC, Rezende LF. CNTF protects MIN6 cells against apoptosis induced by Alloxan and IL-1β through downregulation of the AMPK pathway. Cell Signal 2011; 23:1669-76. [DOI: 10.1016/j.cellsig.2011.06.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2011] [Revised: 06/01/2011] [Accepted: 06/06/2011] [Indexed: 01/27/2023]
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White UA, Stephens JM. The gp130 receptor cytokine family: regulators of adipocyte development and function. Curr Pharm Des 2011; 17:340-6. [PMID: 21375496 DOI: 10.2174/138161211795164202] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Accepted: 02/10/2011] [Indexed: 01/04/2023]
Abstract
Gp130 cytokines are involved in the regulation of numerous biological processes, including hematopoiesis, immune response, inflammation, cardiovascular action, and neuronal survival. These cytokines share glycoprotein 130 as a common signal transducer in their receptor complex and typically activate STAT3. Most gp130 cytokines have paracrine or endocrine actions, and their levels can be measured in circulation in rodents and humans. In recent years, various laboratories have conducted studies to demonstrate that gp130 cytokines can modulate adipocyte development and function. Therefore, these studies suggest that some gp130 cytokines may be viable anti-obesity therapeutics. In this review, we will summarize the reported effects of gp130 cytokines on adipocyte differentiation and adipocyte function. In addition, the modulation of gp130 cytokines in conditions of obesity, insulin resistance, and Type 2 diabetes will be presented.
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Affiliation(s)
- Ursula A White
- Louisiana State University, Department of Biological Sciences, Baton Rouge, LA 70803, USA
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Allen TL, Matthews VB, Febbraio MA. Overcoming insulin resistance with ciliary neurotrophic factor. Handb Exp Pharmacol 2011:179-99. [PMID: 21484573 DOI: 10.1007/978-3-642-17214-4_9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2023]
Abstract
The incidence of obesity and related co-morbidities such as insulin resistance, dyslipidemia and hypertension are increasing at an alarming rate worldwide. Current interventions seem ineffective to halt this progression. With the failure of leptin as an anti-obesity therapeutic, ciliary neurotrophic factor (CNTF) has proven efficacious in models of obesity and leptin resistance, where leptin proved ineffective. CNTF is a gp130 ligand that has been found to act centrally and peripherally to promote weight loss and insulin sensitivity in both human and rodent models. Future research into novel gp130 ligands may offer new candidates for obesity-related drug therapy.
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Affiliation(s)
- Tamara L Allen
- Cellular and Molecular Metabolism Laboratory, Baker IDI Heart and Diabetes Institute, 6492, St Kilda Road Central, Melbourne, 8008, VIC, Australia
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Abstract
Exercise, together with a low-energy diet, is the first-line treatment for type 2 diabetes type 2 diabetes . Exercise improves insulin sensitivity insulin sensitivity by increasing the number or function of muscle mitochondria mitochondria and the capacity for aerobic metabolism, all of which are low in many insulin-resistant subjects. Cannabinoid 1-receptor antagonists and β-adrenoceptor agonists improve insulin sensitivity in humans and promote fat oxidation in rodents independently of reduced food intake. Current drugs for the treatment of diabetes are not, however, noted for their ability to increase fat oxidation, although the thiazolidinediones increase the capacity for fat oxidation in skeletal muscle, whilst paradoxically increasing weight gain.There are a number of targets for anti-diabetic drugs that may improve insulin sensitivity insulin sensitivity by increasing the capacity for fat oxidation. Their mechanisms of action are linked, notably through AMP-activated protein kinase, adiponectin, and the sympathetic nervous system. If ligands for these targets have obvious acute thermogenic activity, it is often because they increase sympathetic activity. This promotes fuel mobilisation, as well as fuel oxidation. When thermogenesis thermogenesis is not obvious, researchers often argue that it has occurred by using the inappropriate device of treating animals for days or weeks until there is weight (mainly fat) loss and then expressing energy expenditure energy expenditure relative to body weight. In reality, thermogenesis may have occurred, but it is too small to detect, and this device distracts us from really appreciating why insulin sensitivity has improved. This is that by increasing fatty acid oxidation fatty acid oxidation more than fatty acid supply, drugs lower the concentrations of fatty acid metabolites that cause insulin resistance. Insulin sensitivity improves long before any anti-obesity effect can be detected.
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Affiliation(s)
- Jonathan R S Arch
- Clore Laboratory, University of Buckingham, Buckingham, MK18 1EG, UK
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Watson E, Fargali S, Okamoto H, Sadahiro M, Gordon RE, Chakraborty T, Sleeman MW, Salton SR. Analysis of knockout mice suggests a role for VGF in the control of fat storage and energy expenditure. BMC PHYSIOLOGY 2009; 9:19. [PMID: 19863797 PMCID: PMC2774661 DOI: 10.1186/1472-6793-9-19] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Accepted: 10/28/2009] [Indexed: 11/29/2022]
Abstract
Background Previous studies of mixed background mice have demonstrated that targeted deletion of Vgf produces a lean, hypermetabolic mouse that is resistant to diet-, lesion-, and genetically-induced obesity. To investigate potential mechanism(s) and site(s) of action of VGF, a neuronal and endocrine secreted protein and neuropeptide precursor, we further analyzed the metabolic phenotypes of two independent VGF knockout lines on C57Bl6 backgrounds. Results Unlike hyperactive VGF knockout mice on a mixed C57Bl6-129/SvJ background, homozygous mutant mice on a C57Bl6 background were hypermetabolic with similar locomotor activity levels to Vgf+/Vgf+ mice, during day and night cycles, indicating that mechanism(s) other than hyperactivity were responsible for their increased energy expenditure. In Vgf-/Vgf- knockout mice, morphological analysis of brown and white adipose tissues (BAT and WAT) indicated decreased fat storage in both tissues, and decreased adipocyte perimeter and area in WAT. Changes in gene expression measured by real-time RT-PCR were consistent with increased fatty acid oxidation and uptake in BAT, and increased lipolysis, decreased lipogenesis, and brown adipocyte differentiation in WAT, suggesting that increased sympathetic nervous system activity in Vgf-/Vgf- mice may be associated with or responsible for alterations in energy expenditure and fat storage. In addition, uncoupling protein 1 (UCP1) and UCP2 protein levels, mitochondrial number, and mitochondrial cristae density were upregulated in Vgf-/Vgf- BAT. Using immunohistochemical and histochemical techniques, we detected VGF in nerve fibers innervating BAT and Vgf promoter-driven reporter expression in cervical and thoracic spinal ganglia that project to and innervate the chest wall and tissues including BAT. Moreover, VGF peptide levels were quantified by radioimmunoassay in BAT, and were found to be down-regulated by a high fat diet. Lastly, despite being hypermetabolic, VGF knockout mice were cold intolerant. Conclusion We propose that VGF and/or VGF-derived peptides modulate sympathetic outflow pathways to regulate fat storage and energy expenditure.
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Affiliation(s)
- Elizabeth Watson
- Department of Neuroscience, Mount Sinai School of Medicine, New York, NY, USA.
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Abstract
The function and survival of all organisms is dependent on the dynamic control of energy metabolism, when energy demand is matched to energy supply. The AMP-activated protein kinase (AMPK) alphabetagamma heterotrimer has emerged as an important integrator of signals that control energy balance through the regulation of multiple biochemical pathways in all eukaryotes. In this review, we begin with the discovery of the AMPK family and discuss the recent structural studies that have revealed the molecular basis for AMP binding to the enzyme's gamma subunit. AMPK's regulation involves autoinhibitory features and phosphorylation of both the catalytic alpha subunit and the beta-targeting subunit. We review the role of AMPK at the cellular level through examination of its many substrates and discuss how it controls cellular energy balance. We look at how AMPK integrates stress responses such as exercise as well as nutrient and hormonal signals to control food intake, energy expenditure, and substrate utilization at the whole body level. Lastly, we review the possible role of AMPK in multiple common diseases and the role of the new age of drugs targeting AMPK signaling.
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Affiliation(s)
- Gregory R Steinberg
- Protein Chemistry and Metabolism, St. Vincent's Institute of Medical Research, University of Melbourne, Fitzroy, Victoria, Australia.
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Kim WS, Lee YS, Cha SH, Jeong HW, Choe SS, Lee MR, Oh GT, Park HS, Lee KU, Lane MD, Kim JB. Berberine improves lipid dysregulation in obesity by controlling central and peripheral AMPK activity. Am J Physiol Endocrinol Metab 2009; 296:E812-9. [PMID: 19176354 DOI: 10.1152/ajpendo.90710.2008] [Citation(s) in RCA: 176] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
AMP-activated protein kinase (AMPK) plays an important role in regulating whole body energy homeostasis. Recently, it has been demonstrated that berberine (BBR) exerts antiobesity and antidiabetic effects in obese and diabetic rodent models through the activation of AMPK in peripheral tissues. Here we show that BBR improves lipid dysregulation and fatty liver in obese mice through central and peripheral actions. In obese db/db and ob/ob mice, BBR treatment reduced liver weight, hepatic and plasma triglyceride, and cholesterol contents. In the liver and muscle of db/db mice, BBR promoted AMPK activity and fatty acid oxidation and changed expression of genes involved in lipid metabolism. Additionally, intracerebroventricular administration of BBR decreased the level of malonyl-CoA and stimulated the expression of fatty acid oxidation genes in skeletal muscle. Together, these data suggest that BBR would improve fatty liver in obese subjects, which is probably mediated not only by peripheral AMPK activation but also by neural signaling from the central nervous system.
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Affiliation(s)
- Woo Sik Kim
- Institute of Molecular Biology and Genetics, Department of Biological Sciences, Seoul National University, San 56-1, Sillim-Dong, Kwanak-Gu, Seoul 151-742, Korea
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Steinberg GR, Watt MJ, Ernst M, Birnbaum MJ, Kemp BE, Jørgensen SB. Ciliary neurotrophic factor stimulates muscle glucose uptake by a PI3-kinase-dependent pathway that is impaired with obesity. Diabetes 2009; 58:829-39. [PMID: 19136654 PMCID: PMC2661597 DOI: 10.2337/db08-0659] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Ciliary neurotrophic factor (CNTF) reverses muscle insulin resistance by increasing fatty acid oxidation through gp130-LIF receptor signaling to the AMP-activated protein kinase (AMPK). CNTF also increases Akt signaling in neurons and adipocytes. Because both Akt and AMPK regulate glucose uptake, we investigated muscle glucose uptake in response to CNTF signaling in lean and obese mice. RESEARCH DESIGN AND METHODS Mice were injected intraperitoneally with saline or CNTF, and blood glucose was monitored. The effects of CNTF on skeletal muscle glucose uptake and AMPK/Akt signaling were investigated in incubated soleus and extensor digitorum longus (EDL) muscles from muscle-specific AMPKalpha2 kinase-dead, gp130(DeltaSTAT), and lean and obese ob/ob and high-fat-fed mice. The effect of C2-ceramide on glucose uptake and gp130 signaling was also examined. RESULTS CNTF reduced blood glucose and increased glucose uptake in isolated muscles in a time- and dose-dependent manner with maximal effects after 30 min with 100 ng/ml. CNTF increased Akt-S473 phosphorylation in soleus and EDL; however, AMPK-T172 phosphorylation was only increased in soleus. Incubation of muscles from AMPK kinase dead (KD) and wild-type littermates with the PI3-kinase inhibitor LY-294002 demonstrated that PI3-kinase, but not AMPK, was essential for CNTF-stimulated glucose uptake. CNTF-stimulated glucose uptake and Akt phosphorylation were substantially reduced in obesity (high-fat diet and ob/ob) despite normal induction of gp130/AMPK signaling--effects also observed when treating myotubes with C2-ceramide. CONCLUSIONS CNTF acutely increases muscle glucose uptake by a mechanism involving the PI3-kinase/Akt pathway that does not require AMPK. CNTF-stimulated glucose uptake is impaired in obesity-induced insulin resistance and by ceramide.
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Affiliation(s)
- Gregory R Steinberg
- St. Vincent's Institute of Medical Research and Department of Medicine, University of Melbourne, Melbourne, Australia.
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Rezende LF, Vieira AS, Negro A, Langone F, Boschero AC. Ciliary neurotrophic factor (CNTF) signals through STAT3-SOCS3 pathway and protects rat pancreatic islets from cytokine-induced apoptosis. Cytokine 2009; 46:65-71. [PMID: 19272793 DOI: 10.1016/j.cyto.2008.12.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2008] [Revised: 12/10/2008] [Accepted: 12/24/2008] [Indexed: 01/11/2023]
Abstract
CNTF is a cytokine that promotes survival and/or differentiation in many cell types, including rat pancreatic islets. In this work, we studied the mechanism of CNTF signal in neonatal rats pancreatic islets isolated by the collagenase method and cultured for 3 days in RPMI medium without (CTL) or with 1 nM of CNTF. The medium contained, when necessary, specific inhibitors of the PI3K, MAPK and JAK/STAT3 pathways. mRNA expression (RT-PCR) and protein phosphorylation (Western blot) of Akt, ERK1/2 and STAT3, and SOCS-3 (RT-PCR and Western blot), as well as glucose-stimulated insulin secretion (GSIS) (Radioimmunoassay), were analyzed. Our results showed that Akt, ERK1 and STAT3 mRNA expression, as well as phosphorylated Akt and ERK1/2, was not affected by CNTF treatment. CNTF increased cytoplasmatic and nuclear phosphorylated STAT3, and the SOCS3 mRNA and protein expression. In addition, CNTF lowered apoptosis and impaired GSIS. These effects were blocked by the JAK inhibitor, AG490 and by the STAT3 inhibitor Curcumin, but not by the MAPK inhibitor, PD98059, nor by the PI3K inhibitor, Wortmannin. In conclusion, CNTF signals through the JAK2/STAT3 cascade, increases SOCS3 expression, impairs GSIS and protects neonatal pancreatic rat islets from cytokine-induced apoptosis. These findings indicate that CNTF may be a potential therapeutic tool against Type 1 and/or Type 2 diabetes.
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Affiliation(s)
- Luiz F Rezende
- Department of Physiology and Biophysics, State University of Campinas, Brazil
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Benomar Y, Berthou F, Vacher CM, Bailleux V, Gertler A, Djiane J, Taouis M. Leptin but not ciliary neurotrophic factor (CNTF) induces phosphotyrosine phosphatase-1B expression in human neuronal cells (SH-SY5Y): putative explanation of CNTF efficacy in leptin-resistant state. Endocrinology 2009; 150:1182-91. [PMID: 19008309 DOI: 10.1210/en.2008-1097] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Growing evidences suggest that obesity is associated with hypothalamic leptin resistance, leading to the alteration of food intake control. Alternative treatment using ciliary neurotrophic factor (CNTF) has been suggested because CNTF exerts a leptin-like effect, even in leptin-resistant states, but the mechanisms by which CNTF maintains this effect are not yet understood. Both leptin and CNTF act in the hypothalamus through similar signaling pathways including janus kinase-2/signal transducer and activator of transcription (STAT)-3 pathway. To explore the differences and interactions between leptin and CNTF signaling pathways, differentiated human neuroblastoma cells (SH-SY5Y) were exposed to either leptin or CNTF and then challenged for each cytokine. Leptin pretreatment completely abolished leptin-dependent STAT-3 and ERK 1/2 phosphorylations without affecting CNTF action. The lack of cross-desensitization between leptin and CNTF signaling pathways occurred despite the induction of suppressor of cytokine signaling-3 in response to both cytokines. Interestingly, leptin as well as insulin induced the expression of phosphotyrosine phosphatase (PTP)-1B, whereas CNTF treatment did not affect its expression. In addition, acute leptin treatment but not CNTF induced PTP-1B expression in mouse hypothalamic arcuate nucleus. Furthermore, the overexpression of human PTP-1B in SH-SY5Y cells completely abolished leptin- and insulin-dependent janus kinase-2, STAT-3, and ERK 1/2 phosphorylations, but CNTF action was not altered. Collectively, our results suggest that PTP-1B constitutes a key divergent element between leptin/insulin and CNTF signaling pathways at the neuronal level, which may constitute a possible mechanism that explains the efficacy of CNTF in leptin-resistant states.
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Affiliation(s)
- Yacir Benomar
- Neuroendocrinologie Moléculaire de la Prise Alimentaire, Unité Mixte de Recherche 1197, Université Paris-Sud 11, Institut National de la Recherche Agronomique, Orsay, France
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Polymeropoulos MH, Licamele L, Volpi S, Mack K, Mitkus SN, Carstea ED, Getoor L, Thompson A, Lavedan C. Common effect of antipsychotics on the biosynthesis and regulation of fatty acids and cholesterol supports a key role of lipid homeostasis in schizophrenia. Schizophr Res 2009; 108:134-42. [PMID: 19150222 DOI: 10.1016/j.schres.2008.11.025] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2008] [Revised: 11/24/2008] [Accepted: 11/25/2008] [Indexed: 01/24/2023]
Abstract
For decades, the dopamine hypothesis has gained the most attention in an attempt to explain the origin and the symptoms of schizophrenia. While this hypothesis offers an explanation for the relationship between psychotic symptoms and dopamine kinetics, it does not provide a direct explanation of the etiology of schizophrenia which remains poorly understood. Consequently, current antipsychotics that target neurotransmitter receptors, have limited and inconsistent efficacy. To gain insights into the mechanism of action of these drugs, we studied the expression profile of 12,490 human genes in a cell line treated with 18 antipsychotics, and compared it to that of a library of 448 other compounds used in a variety of disorders. Analysis reveals a common effect of antipsychotics on the biosynthesis and regulation of fatty acids and cholesterol, which is discussed in the context of a lipid hypothesis where alterations in lipid homeostasis might underlie the pathogenesis of schizophrenia. This finding may help research aimed at the development of novel treatments for this devastating disease.
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Buettner C, Camacho RC. Hypothalamic control of hepatic glucose production and its potential role in insulin resistance. Endocrinol Metab Clin North Am 2008; 37:825-40. [PMID: 19026934 DOI: 10.1016/j.ecl.2008.09.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The liver plays a pivotal role in the regulation of glucose metabolism because it is the key organ that maintains glucose levels during fasting. An emerging body of literature has demonstrated the important role of the hypothalamus in controlling hepatic glucose production (HGP). The hypothalamus senses circulating nutrients and hormones, conveying the energy status to the central nervous system, which, in turn, controls HGP in part by way of the autonomic nervous system. Overfeeding results in the failure of the hypothalamus to sense circulating nutrients and hormones, and in a loss of the central control of HGP.
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Affiliation(s)
- Christoph Buettner
- Department of Medicine and Neuroscience, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029, USA.
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Lage R, Diéguez C, Vidal-Puig A, López M. AMPK: a metabolic gauge regulating whole-body energy homeostasis. Trends Mol Med 2008; 14:539-49. [DOI: 10.1016/j.molmed.2008.09.007] [Citation(s) in RCA: 359] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 09/26/2008] [Accepted: 09/29/2008] [Indexed: 12/19/2022]
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Abstract
Interest in the control of feeding has increased as a result of the obesity epidemic and rising incidence of metabolic diseases. The brain detects alterations in energy stores and triggers metabolic and behavioral responses designed to maintain energy balance. Energy homeostasis is controlled mainly by neuronal circuits in the hypothalamus and brainstem, whereas reward and motivation aspects of eating behavior are controlled by neurons in limbic regions and the cerebral cortex. This article provides an integrated perspective on how metabolic signals emanating from the gastrointestinal tract, adipose tissue, and other peripheral organs target the brain to regulate feeding, energy expenditure, and hormones. The pathogenesis and treatment of obesity and abnormalities of glucose and lipid metabolism are discussed.
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Affiliation(s)
- Rexford S Ahima
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Pennsylvania School of Medicine, 415 Curie Boulevard, Philadelphia, PA 19104, USA.
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Yeh SS, Blackwood K, Schuster MW. The cytokine basis of cachexia and its treatment: are they ready for prime time? J Am Med Dir Assoc 2008; 9:219-36. [PMID: 18457797 DOI: 10.1016/j.jamda.2008.01.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2008] [Accepted: 01/04/2008] [Indexed: 01/14/2023]
Abstract
Cachexia is a hypercatabolic condition that is often associated with the terminal stages of many diseases, in which the patient's resting metabolic rate is high and loss of muscle and fat tissue mass occur at an alarming rate. The patient also usually has concurrent anorexia, amplifying the wasting syndrome that is cachexia. The greater the extent of cachexia (regardless of underlying disease), the worse the prognosis. Efforts to treat cachexia over the years have fallen short of satisfactorily reversing the wasting syndrome. This article reviews the pathophysiology of cachexia, enumerating the different pro-inflammatory cytokines that contribute to the syndrome and attempting to illustrate their interwoven pathways. We also review the different treatments that have been explored, as well as the recent literature addressing the use of anti-cytokine therapy to treat cachexia.
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