1
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Li F, Geng X, Ilagan R, Bai S, Chen Y, Ding Y. Exercise postconditioning reduces ischemic injury via suppression of cerebral gluconeogenesis in rats. Brain Behav 2023; 13:e2805. [PMID: 36448290 PMCID: PMC9847623 DOI: 10.1002/brb3.2805] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 08/30/2022] [Accepted: 10/08/2022] [Indexed: 12/05/2022] Open
Abstract
Pre-stroke exercise conditioning reduces neurovascular injury and improves functional outcomes after stroke. The goal of this study was to explore if post-stroke exercise conditioning (PostE) reduced brain injury and whether it was associated with the regulation of gluconeogenesis. Adult rats received 2 h of middle cerebral artery (MCA) occlusion, followed by 24 h of reperfusion. Treadmill activity was then initiated 24 h after reperfusion for PostE. The severity of the brain damage was determined by infarct volume, apoptotic cell death, and neurological deficit at one and three days after reperfusion. We measured gluconeogenesis including oxaloacetate (OAA), phosphoenolpyruvate (PEP), pyruvic acid, lactate, ROS, and glucose via ELISA, as well as the location and expression of the key enzyme phosphoenolpyruvate carboxykinase (PCK)-1/2 via immunofluorescence. We also determined upstream pathways including forkhead transcription factor (FoxO1), p-FoxO1, 3-kinase (PI3K)/Akt, and p-PI3K/Akt via Western blot. Additionally, the cytoplasmic expression of p-FoxO1 was detected by immunofluorescence. Compared to non-exercise control, PostE (*p < .05) decreased brain infarct volumes, neurological deficits, and cell death at one and three days. PostE groups (*p < .05) saw increases in OAA and decreases in PEP, pyruvic acid, lactate, ROS, glucose levels, and tissue PCKs expression on both days. PCK-1/2 expressions were also significantly (*p < .05) suppressed by the exercise setting. Additionally, phosphorylated PI3K, AKT, and FoxO1 protein expression were significantly induced by PostE at one and three days (*p < .05). In this study, PostE reduced brain injury after stroke, in association with activated PI3K/AKT/FoxO1 signaling, and inhibited gluconeogenesis. These results suggest the involvement of FoxO1 regulation of gluconeogenesis underlying post-stroke neuroprotection.
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Affiliation(s)
- Fengwu Li
- China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical University, Beijing, China.,Department of Developmental Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Xiaokun Geng
- China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical University, Beijing, China.,Department of Neurology, Beijing Luhe Hospital, Capital Medical University, Beijing, China.,Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Roxanne Ilagan
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Shangying Bai
- China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical University, Beijing, China
| | - Yuhua Chen
- Department of Developmental Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Yuchuan Ding
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, USA
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2
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Zhang Y, Ye T, Zhou P, Li R, Liu Z, Xie J, Hua T, Sun Q. Exercise ameliorates insulin resistance and improves ASK1-mediated insulin signalling in obese rats. J Cell Mol Med 2021; 25:10930-10938. [PMID: 34734480 PMCID: PMC8642671 DOI: 10.1111/jcmm.16994] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 09/17/2021] [Accepted: 09/23/2021] [Indexed: 11/30/2022] Open
Abstract
Increasing evidence reveals that physical exercise is an efficient therapeutical approach in the treatment of insulin resistance (IR) and related metabolic diseases. However, the potential beneficial effects of exercise on insulin resistance and its underlying mechanisms remain unclear. Recent findings elucidated the negative role of ASK1 in repressing the glucose uptake through JNK1‐IRS1‐Akt signalling in liver. Thus, a detailed investigation of the effect of ASK1‐mediated insulin signalling on exercise‐mediated improvement of insulin sensitivity and its underlying mechanism was implemented in this study. Using a high‐fat diet‐induced IR rat model of chronic or acute swimming exercise training, we here showed that body weight and visceral fat mass were significantly reduced after chronic exercise. Moreover, chronic exercise reduced serum FFAs levels and hepatic triglyceride content. Both chronic and acute exercise promoted glucose tolerance and insulin sensitivity. Meanwhile, both chronic and acute exercise decreased ASK1 phosphorylation and improved JNK1‐IRS1‐Akt signalling. Furthermore, exercise training decreased CFLAR, CREG and TRAF1 protein levels in liver of obese rats, which are positive regulator of ASK1 activity. These results suggested that swimming exercise demonstrated to be an effective ameliorator of IR through the regulation of ASK1‐mediated insulin signalling and therefore, could present a prospective therapeutic mean towards the treatment of IR and several metabolic diseases based on IR, containing NAFLD and type Ⅱ diabetes.
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Affiliation(s)
- Yong Zhang
- Physiology laboratory of College of Life Sciences, Anhui Normal University, Wuhu, China.,The State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Biology, School of Life Sciences, Xiamen University, Xiamen, China
| | - Tingting Ye
- Physiology laboratory of College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Puqing Zhou
- Physiology laboratory of College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Runjing Li
- Department of Cardiology, School of Medicine, The First Affiliated Hospital of Xiamen University, Xiamen University, Xiamen, China
| | - Zuofeng Liu
- Department of Hepatobiliary Surgery, School of Medicine, Xiang'an Hospital of Xiamen University, Xiamen University, Xiamen, China
| | - Jianyuan Xie
- The State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Biology, School of Life Sciences, Xiamen University, Xiamen, China
| | - Tianmiao Hua
- Neurobiology laboratory of College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Qingyan Sun
- Physiology laboratory of College of Life Sciences, Anhui Normal University, Wuhu, China
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3
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Vieira RFL, Muñoz VR, Junqueira RL, de Oliveira F, Gaspar RC, Nakandakari SCBR, Costa SDO, Torsoni MA, da Silva ASR, Cintra DE, de Moura LP, Ropelle ER, Zaghloul I, Mekary RA, Pauli JR. Time-restricted feeding combined with aerobic exercise training can prevent weight gain and improve metabolic disorders in mice fed a high-fat diet. J Physiol 2021; 600:797-813. [PMID: 33450053 DOI: 10.1113/jp280820] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 01/08/2021] [Indexed: 01/02/2023] Open
Abstract
KEY POINTS Time-restricted feeding (TRF, in which energy intake is restricted to 8 h/day during the dark phase) alone or combined with aerobic exercise (AE) training can prevent weight gain and metabolic disorders in Swiss mice fed a high-fat diet. The benefits of TRF combined with AE are associated with improved hepatic metabolism and decreased hepatic lipid accumulation. TRF combined with AE training increased fatty acid oxidation and decreased expression of lipogenic and gluconeogenic genes in the liver of young male Swiss mice. TRF combined with AE training attenuated the detrimental effects of high-fat diet feeding on the insulin signalling pathway in the liver. ABSTRACT Time-restricted feeding (TRF) or physical exercise have been shown to be efficient in the prevention and treatment of metabolic disorders; however, the additive effects of TRF combined with aerobic exercise (AE) training on liver metabolism have not been widely explored. In this study TRF (8 h in the active phase) and TRF combined with AE (TRF+Exe) were compared in male Swiss mice fed a high-fat diet, with evaluation of the effects on insulin sensitivity and expression of hepatic genes involved in fatty acid oxidation, lipogenesis and gluconeogenesis. As in previous reports, we show that TRF alone (eating only between zeitgeber time 16 and 0) was sufficient to reduce weight and adiposity gain, increase fatty acid oxidation and decrease lipogenesis genes in the liver. In addition, we show that mice of the TRF+Exe group showed additional adaptations such as increased oxygen consumption ( V ̇ O 2 ), carbon dioxide production ( V ̇ C O 2 ) and production of ketone bodies (β-hydroxybutyrate). Also, TRF+Exe attenuated the negative effects of high-fat diet feeding on the insulin signalling pathway (insulin receptor, insulin receptor substrate, Akt), and led to increased fatty acid oxidation (Ppara, Cpt1a) and decreased gluconeogenic (Fbp1, Pck1, Pgc1a) and lipogenic (Srebp1c, Cd36) gene expression in the liver. These molecular results were accompanied by increased glucose metabolism, lower serum triglycerides and reduced hepatic lipid content in the TRF+Exe group. The data presented in this study show that TRF alone has benefits but TRF+Exe has additive benefits and can mitigate the harmful effects of consuming a high-fat diet on body adiposity, liver metabolism and glycaemic homeostasis in young male Swiss mice.
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Affiliation(s)
- Renan Fudoli Lins Vieira
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Vitor Rosetto Muñoz
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Rafael Lima Junqueira
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Fellipe de Oliveira
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Rafael Calais Gaspar
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | | | - Suleyma de Oliveira Costa
- Laboratory of Metabolism Disorders, Faculty of Applied Sciences, State University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Marcio Alberto Torsoni
- Laboratory of Metabolism Disorders, Faculty of Applied Sciences, State University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,Laboratory of Cell Signaling, Obesity and Comorbidities Research Center (OCRC), University of Campinas, Campinas, São Paulo, Brazil
| | - Adelino S R da Silva
- Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, and Postgraduate Program in Physical Education and Sport, School of Physical Education and Sport of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, São Paulo, Brazil
| | - Dennys Esper Cintra
- Laboratory of Nutritional Genomics (LabGeN), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,Laboratory of Cell Signaling, Obesity and Comorbidities Research Center (OCRC), University of Campinas, Campinas, São Paulo, Brazil
| | - Leandro Pereira de Moura
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,Laboratory of Cell Signaling, Obesity and Comorbidities Research Center (OCRC), University of Campinas, Campinas, São Paulo, Brazil
| | - Eduardo Rochete Ropelle
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,Laboratory of Cell Signaling, Obesity and Comorbidities Research Center (OCRC), University of Campinas, Campinas, São Paulo, Brazil
| | - Iman Zaghloul
- Massachusetts College of Pharmacy and Health Sciences (MCPHS), Boston, MA, USA
| | - Rania A Mekary
- Massachusetts College of Pharmacy and Health Sciences (MCPHS), Boston, MA, USA.,Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - José Rodrigo Pauli
- Laboratory of Molecular Biology of Exercise (LaBMEx), University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,Laboratory of Cell Signaling, Obesity and Comorbidities Research Center (OCRC), University of Campinas, Campinas, São Paulo, Brazil
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4
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Sato Y, Qiu J, Miura T, Kohzuki M, Ito O. Effects of Long-Term Exercise on Liver Cyst in Polycystic Liver Disease Model Rats. Med Sci Sports Exerc 2020; 52:1272-1279. [PMID: 31880641 DOI: 10.1249/mss.0000000000002251] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Polycystic liver disease (PLD) is a hereditary liver disease with progressive enlargement of fluid-filled liver cysts, which causes abdominal discomfort and worsens quality of life. Long-term exercise has beneficial effects in various organs, but the effects of long-term exercise on PLD are unclear. Therefore, the aim of this study was to investigate whether long-term exercise inhibits liver cyst formation and fibrosis. METHODS Polycystic kidney (PCK) rats, a model of PLD, were randomly divided into a sedentary group and a long-term exercise group, which underwent treadmill running for 12 wk (28 m·min, 60 min·d, 5 d·wk). Sprague-Dawley (SD) rats were set as a control group. After 12 wk, exercise capacity, histology, and signaling cascades of PLD were examined. RESULTS Compared with control SD rats, PCK rats showed a low exercise capacity before exercise protocol. After 12 wk, the exercise improved the exercise capacity and ameliorated liver cyst formation and fibrosis. The exercise significantly decreased the number of Ki-67-positive cells; the expression of cystic fibrosis transmembrane conductance regulator, aquaporin 1, transforming growth factor β, and type 1 collagen; and the phosphorylation of extracellular signal-regulated kinase, mammalian target of rapamycin and S6. It also increased the phosphorylation of AMP-activated protein kinase in the liver of PCK rats. CONCLUSIONS The present results indicated that long-term moderate-intensity exercise ameliorates liver cyst formation and fibrosis with the inhibition of signaling cascades responsible for cellular proliferation and fibrosis in PCK rats.
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Affiliation(s)
- Yoichi Sato
- Department of Internal Medicine and Rehabilitation Science, Tohoku University Graduate School of Medicine, Sendai, JAPAN
| | - Jiahe Qiu
- Department of Internal Medicine and Rehabilitation Science, Tohoku University Graduate School of Medicine, Sendai, JAPAN
| | - Takahiro Miura
- Department of Internal Medicine and Rehabilitation Science, Tohoku University Graduate School of Medicine, Sendai, JAPAN
| | - Masahiro Kohzuki
- Department of Internal Medicine and Rehabilitation Science, Tohoku University Graduate School of Medicine, Sendai, JAPAN
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5
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Hurr C, Simonyan H, Morgan DA, Rahmouni K, Young CN. Liver sympathetic denervation reverses obesity-induced hepatic steatosis. J Physiol 2019; 597:4565-4580. [PMID: 31278754 DOI: 10.1113/jp277994] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 06/26/2019] [Indexed: 01/05/2023] Open
Abstract
KEY POINTS Non-alcoholic fatty liver disease, characterized in part by elevated liver triglycerides (i.e. hepatic steatosis), is a growing health problem. In this study, we found that hepatic steatosis is associated with robust hepatic sympathetic overactivity. Removal of hepatic sympathetic nerves reduced obesity-induced hepatic steatosis. Liver sympathetic innervation modulated hepatic lipid acquisition pathways during obesity. ABSTRACT Non-alcoholic fatty liver disease (NAFLD) affects 1 in 3 Americans and is a significant risk factor for type II diabetes mellitus, insulin resistance and hepatic carcinoma. Characterized in part by excessive hepatic triglyceride accumulation (i.e. hepatic steatosis), the incidence of NAFLD is increasing - in line with the growing obesity epidemic. The role of the autonomic nervous system in NAFLD remains unclear. Here, we show that chronic hepatic sympathetic overactivity mediates hepatic steatosis. Direct multiunit recordings of hepatic sympathetic nerve activity were obtained in high fat diet and normal chow fed male C57BL/6J mice. To reduce hepatic sympathetic nerve activity we utilized two approaches including pharmacological ablation of the sympathetic nerves and phenol-based hepatic sympathetic nerve denervation. Diet-induced NAFLD was associated with a nearly doubled firing rate of the hepatic sympathetic nerves, which was largely due to an increase in efferent nerve traffic. Furthermore, established high fat diet-induced hepatic steatosis was effectively reduced with pharmacological or phenol-based removal of the hepatic sympathetic nerves, independent of changes in body weight, caloric intake or adiposity. Ablation of liver sympathetic nerves was also associated with improvements in liver triglyceride accumulation pathways including free fatty acid uptake and de novo lipogenesis. These findings highlight an unrecognized pathogenic link between liver sympathetic outflow and hepatic steatosis and suggest that manipulation of the liver sympathetic nerves may represent a novel therapeutic strategy for NAFLD.
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Affiliation(s)
- Chansol Hurr
- Department of Pharmacology and Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, DC, USA.,Department of Physical Education, Chonbuk National University, Jeonju, South Korea
| | - Hayk Simonyan
- Department of Pharmacology and Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, DC, USA
| | - Donald A Morgan
- Department of Pharmacology, University of Iowa, Iowa City, IA, USA
| | - Kamal Rahmouni
- Department of Pharmacology, University of Iowa, Iowa City, IA, USA
| | - Colin N Young
- Department of Pharmacology and Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, DC, USA
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6
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Pereira RM, Rodrigues KCDC, Anaruma CP, Sant'Ana MR, de Campos TDP, Gaspar RS, Canciglieri RDS, de Melo DG, Mekary RA, da Silva ASR, Cintra DE, Ropelle ER, Pauli JR, de Moura LP. Short-term strength training reduces gluconeogenesis and NAFLD in obese mice. J Endocrinol 2019; 241:59-70. [PMID: 30878016 DOI: 10.1530/joe-18-0567] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 02/15/2019] [Indexed: 12/20/2022]
Abstract
Non-alcoholic fatty liver disease (NAFLD) has a positive correlation with obesity, insulin resistance and type 2 diabetes mellitus (T2D). The aerobic training is an important tool in combating NAFLD. However, no studies have demonstrated the molecular effects of short-term strength training on the accumulation of hepatic fat in obese mice. This study aimed to investigate the effects of short-term strength training on the mechanisms of oxidation and lipid synthesis in the liver of obese mice. The short duration protocol was used to avoid changing the amount of adipose tissue. Swiss mice were separated into three groups: lean control (CTL), sedentary obese (OB) and strength training obese (STO). The obese groups were fed a high-fat diet (HFD) and the STO group performed the strength training protocol 1 session/day for 15 days. The short-term strength training reduced hepatic fat accumulation, increasing hepatic insulin sensitivity and controlling hepatic glucose production. The obese animals increased the mRNA of lipogenic genes Fasn and Scd1 and reduced the oxidative genes Cpt1a and Ppara. On the other hand, the STO group presented the opposite results. Finally, the obese animals presented higher levels of lipogenic proteins (ACC and FAS) and proinflammatory cytokines (TNF-α and IL-1β), but the short-term strength training was efficient in reducing this condition, regardless of body weight loss. In conclusion, there was a reduction of obesity-related hepatic lipogenesis and inflammation after short-term strength training, independent of weight loss, leading to improvements in hepatic insulin sensitivity and glycemic homeostasis in obese mice. Key points: (1) Short-term strength training (STST) reduced fat accumulation and inflammation in the liver; (2) Hepatic insulin sensitivity and HPG control were increased with STST; (3) The content and activity of ACC and content of FAS were reduced with STST; (4) STST improved hepatic fat accumulation and glycemic homeostasis; (5) STST effects were observed independently of body weight change.
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Affiliation(s)
- Rodrigo Martins Pereira
- Laboratory of Molecular Biology of Exercise, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | | | - Chadi Pellegrini Anaruma
- Laboratory of Molecular Biology of Exercise, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | - Marcella Ramos Sant'Ana
- Laboratory of Nutritional Genomics, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | | | - Rodrigo Stellzer Gaspar
- Laboratory of Molecular Biology of Exercise, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | | | - Diego Gomes de Melo
- Laboratory of Molecular Biology of Exercise, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | - Rania A Mekary
- Department of Neurosurgery, Computational Neuroscience Outcomes Center, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Social and Administrative Sciences, School of Pharmacy, MCPHS University, Boston, Massachusetts, USA
| | - Adelino Sanchez Ramos da Silva
- School of Physical Education and Sport of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, São Paulo, Brazil
- Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, USP, Ribeirão Preto, São Paulo, Brazil
| | - Dennys Esper Cintra
- Laboratory of Nutritional Genomics, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | - Eduardo Rochete Ropelle
- Laboratory of Molecular Biology of Exercise, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | - José Rodrigo Pauli
- Laboratory of Molecular Biology of Exercise, School of Applied Sciences, University of Campinas, Limeira, Brazil
| | - Leandro Pereira de Moura
- Laboratory of Molecular Biology of Exercise, School of Applied Sciences, University of Campinas, Limeira, Brazil
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7
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Kristensen CM, Dethlefsen MM, Tøndering AS, Lassen SB, Meldgaard JN, Ringholm S, Pilegaard H. PGC-1α in hepatic UPR during high-fat high-fructose diet and exercise training in mice. Physiol Rep 2018; 6:e13819. [PMID: 30105901 PMCID: PMC6090221 DOI: 10.14814/phy2.13819] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 06/18/2018] [Accepted: 06/21/2018] [Indexed: 01/06/2023] Open
Abstract
Diet-induced obesity is associated with hepatic steatosis, which has been linked with activation of the unfolded protein response (UPR). PGC-1α is a transcriptional coactivator involved in exercise training-induced adaptations in muscle and liver. Therefore, the aim of this study was to test the hypothesis that PGC-1α is required for exercise training-mediated prevention of diet-induced steatosis and UPR activation in liver. Male liver-specific PGC-1α knockout (LKO) and littermate floxed (lox/lox) mice were divided into two groups receiving either control diet (CON) or high-fat high-fructose diet (HFF). After 9 weeks, half of the HFF mice were treadmill exercise trained for 4 weeks (HFF+ExT), while the rest were kept sedentary. HFF resulted in increased body and liver weight, adiposity, hepatic steatosis and whole body glucose intolerance as well as decreased hepatic IRE1α phosphorylation. Exercise training prevented the HFF-induced weight gain and partially prevented increased liver weight, adiposity and glucose intolerance, but with no effect on liver triglycerides. In addition, BiP protein and CHOP mRNA content increased with exercise training compared with CON and HFF, respectively. Lack of PGC-1α in the liver only resulted in minor changes in the PERK pathway. In conclusion, this study provides evidence for dissociation between diet-induced hepatic triglyceride accumulation and hepatic UPR activation. In addition, PGC-1α was not required for maintenance of basal UPR in the liver and due to only minor exercise training effects on UPR further studies are needed to conclude on the potential role of PGC-1α in exercise training-induced adaptations in hepatic UPR.
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Affiliation(s)
| | | | | | - Signe B. Lassen
- Department of BiologyUniversity of CopenhagenCopenhagenDenmark
| | | | - Stine Ringholm
- Department of BiologyUniversity of CopenhagenCopenhagenDenmark
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8
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Pourteymour S, Hjorth M, Lee S, Holen T, Langleite TM, Jensen J, Birkeland KI, Drevon CA, Eckardt K. Dual specificity phosphatase 5 and 6 are oppositely regulated in human skeletal muscle by acute exercise. Physiol Rep 2018; 5:5/19/e13459. [PMID: 28989118 PMCID: PMC5641939 DOI: 10.14814/phy2.13459] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 08/25/2017] [Accepted: 08/29/2017] [Indexed: 12/24/2022] Open
Abstract
Physical activity promotes specific adaptations in most tissues including skeletal muscle. Acute exercise activates numerous signaling cascades including pathways involving mitogen‐activated protein kinases (MAPKs) such as extracellular signal‐regulated kinase (ERK)1/2, which returns to pre‐exercise level after exercise. The expression of MAPK phosphatases (MKPs) in human skeletal muscle and their regulation by exercise have not been investigated before. In this study, we used mRNA sequencing to monitor regulation of MKPs in human skeletal muscle after acute cycling. In addition, primary human myotubes were used to gain more insights into the regulation of MKPs. The two ERK1/2‐specific MKPs, dual specificity phosphatase 5 (DUSP5) and DUSP6, were the most regulated MKPs in skeletal muscle after acute exercise. DUSP5 expression was ninefold higher immediately after exercise and returned to pre‐exercise level within 2 h, whereas DUSP6 expression was reduced by 43% just after exercise and remained below pre‐exercise level after 2 h recovery. Cultured myotubes express both MKPs, and incubation with dexamethasone (Dex) mimicked the in vivo expression pattern of DUSP5 and DUSP6 caused by exercise. Using a MAPK kinase inhibitor, we showed that stimulation of ERK1/2 activity by Dex was required for induction of DUSP5. However, maintaining basal ERK1/2 activity was required for basal DUSP6 expression suggesting that the effect of Dex on DUSP6 might involve an ERK1/2‐independent mechanism. We conclude that the altered expression of DUSP5 and DUSP6 in skeletal muscle after acute endurance exercise might affect ERK1/2 signaling of importance for adaptations in skeletal muscle during exercise.
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Affiliation(s)
- Shirin Pourteymour
- Department of Nutrition, Institute for Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Marit Hjorth
- Department of Nutrition, Institute for Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway.,Diabetes and Metabolism Division, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - Sindre Lee
- Department of Nutrition, Institute for Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Torgeir Holen
- Department of Nutrition, Institute for Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Torgrim M Langleite
- Department of Nutrition, Institute for Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Jørgen Jensen
- Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway
| | - Kåre I Birkeland
- Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Christian A Drevon
- Department of Nutrition, Institute for Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Kristin Eckardt
- Department of Nutrition, Institute for Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
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9
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Zhang N, Geng T, Wang Z, Zhang R, Cao T, Camporez JP, Cai SY, Liu Y, Dandolo L, Shulman GI, Carmichael GG, Taylor HS, Huang Y. Elevated hepatic expression of H19 long noncoding RNA contributes to diabetic hyperglycemia. JCI Insight 2018; 3:120304. [PMID: 29769440 DOI: 10.1172/jci.insight.120304] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 04/19/2018] [Indexed: 11/17/2022] Open
Abstract
Excessive hepatic glucose production (HGP) contributes significantly to the hyperglycemia of type 2 diabetes; however, the molecular mechanism underlying this dysregulation remains poorly understood. Here, we show that fasting temporally increases the expression of H19 long noncoding RNA (lncRNA) in nondiabetic mouse liver, whereas its level is chronically elevated in diet-induced diabetic mice, consistent with the previously reported chronic hepatic H19 increase in diabetic patients. Importantly, liver-specific H19 overexpression promotes HGP, hyperglycemia, and insulin resistance, while H19 depletion enhances insulin-dependent suppression of HGP. Using genome-wide methylation and transcriptome analyses, we demonstrate that H19 knockdown in hepatic cells alters promoter methylation and expression of Hnf4a, a master gluconeogenic transcription factor, and that this regulation is recapitulated in vivo. Our findings offer a mechanistic explanation of lncRNA H19's role in the pathogenesis of diabetic hyperglycemia and suggest that targeting hepatic H19 may hold the potential of new treatment for this disease.
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Affiliation(s)
- Na Zhang
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Genetics and Genome Sciences, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Tingting Geng
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Endocrinology, First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, China
| | - Zhangsheng Wang
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Cardiology, Fifth People's Hospital of Shanghai, Fudan University, Shanghai, China
| | - Ruling Zhang
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Tiefeng Cao
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Gynecology and Obstetrics, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Joao Paulo Camporez
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Shi-Ying Cai
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Ya Liu
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Veterinary Medicine, College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui, China
| | - Luisa Dandolo
- Department of Genetics and Development, Inserm U1016, Institut Cochin, Paris, France
| | - Gerald I Shulman
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Gordon G Carmichael
- Department of Genetics and Genome Sciences, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Hugh S Taylor
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Yingqun Huang
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut, USA
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10
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Muñoz VR, Gaspar RC, Kuga GK, Nakandakari SCBR, Baptista IL, Mekary RA, da Silva ASR, de Moura LP, Ropelle ER, Cintra DE, Pauli JR. Exercise decreases CLK2 in the liver of obese mice and prevents hepatic fat accumulation. J Cell Biochem 2018; 119:5885-5892. [PMID: 29575149 DOI: 10.1002/jcb.26780] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 02/02/2018] [Indexed: 12/31/2022]
Abstract
The accumulation of fatty acids in the liver associated with obesity condition is also known as nonalcoholic fatty liver disease (NAFLD). The impaired fat oxidation in obesity condition leads to increased hepatic fat accumulation and increased metabolic syndrome risk. On the other hand, physical exercise has been demonstrated as a potent strategy in the prevention of NAFLD. Also, these beneficial effects of exercise occur through different mechanisms. Recently, the Cdc2-like kinase (CLK2) protein was associated with the suppression of fatty acid oxidation and hepatic ketogenesis. Thus, obese animals demonstrated elevated levels of hepatic CLK2 and decreased fat acid oxidation. Here, we explored the effects of chronic physical exercise in the hepatic metabolism of obese mice. Swiss mice were distributed in Lean, Obese (fed with high-fat diet during 16 weeks) and Trained Obese group (fed with high-fat diet during 16 weeks and exercised (at 60% exhaustion velocity during 1 h/5 days/week) during 8 weeks. In our results, the obese animals showed insulin resistance, increased hepatic CLK2 content and increased hepatic fat accumulation compared to the Lean group. Otherwise, the chronic physical exercise improved insulin resistance state, prevented the increased CLK2 in the liver and attenuated hepatic fat accumulation. In summary, these data reveal a new protein involved in the prevention of hepatic fat accumulation after chronic physical exercise. More studies can evidence the negative role of CLK2 in the control of liver metabolism, contributing to the improvement of insulin resistance, obesity, and type 2 diabetes.
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Affiliation(s)
- Vitor R Muñoz
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Rafael C Gaspar
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Gabriel K Kuga
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Susana C B R Nakandakari
- Laboratory of Nutritional Genomics, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Igor L Baptista
- Laboratory of Cell and Tissue Biology, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Rania A Mekary
- Department of Nutrition, Harvard T. Chan School of Public Health, Boston, Massachusetts.,Department of Social and Administrative Sciences, MCPHS University, Boston, Massachusetts
| | - Adelino S R da Silva
- Postgraduate Program in Rehabilitation and Functional Performance, School of Physical Education and Sport of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, São Paulo, Brazil
| | - Leandro P de Moura
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.,CEPECE-Center of Research in Sport Sciences. School of Applied Sciences, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Eduardo R Ropelle
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.,CEPECE-Center of Research in Sport Sciences. School of Applied Sciences, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
| | - Dennys E Cintra
- Laboratory of Nutritional Genomics, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - José R Pauli
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil.,OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.,CEPECE-Center of Research in Sport Sciences. School of Applied Sciences, University of Campinas (UNICAMP), Limeira, São Paulo, Brazil
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11
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Inflammation MO. Retracted: Treadmill Training Increases SIRT-1 and PGC-1 α Protein Levels and AMPK Phosphorylation in Quadriceps of Middle-Aged Rats in an Intensity-Dependent Manner. Mediators Inflamm 2017; 2017:8287646. [PMID: 29123335 PMCID: PMC5662800 DOI: 10.1155/2017/8287646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 08/07/2017] [Indexed: 11/17/2022] Open
Abstract
[This retracts the article DOI: 10.1155/2014/987017.].
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12
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Rodrigues BDA, Muñoz VR, Kuga GK, Gaspar RC, Nakandakari SCBR, Crisol BM, Botezelli JD, Pauli LSS, da Silva ASR, de Moura LP, Cintra DE, Ropelle ER, Pauli JR. Obesity Increases Mitogen-Activated Protein Kinase Phosphatase-3 Levels in the Hypothalamus of Mice. Front Cell Neurosci 2017; 11:313. [PMID: 29062272 PMCID: PMC5640777 DOI: 10.3389/fncel.2017.00313] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 09/21/2017] [Indexed: 11/21/2022] Open
Abstract
Mitogen-activated Protein Kinase Phosphatase 3 (MKP-3) has been involved in the negative regulation of insulin signaling. The absence of MKP-3 is also associated with reduced adiposity, increased energy expenditure and improved insulin sensitivity. The MKP-3 is known as the main Erk1/2 phosphatase and FoxO1 activator, which has repercussions on the gluconeogenesis pathway and hyperglycemia in obese mice. Recently, we showed that MKP-3 overexpression decreases FoxO1 phosphorylation in the hypothalamus of lean mice. However, the hypothalamic interaction between MKP-3 and FoxO1 during obesity was not investigated yet. Here, the MKP-3 expression and the effects on food intake and energy expenditure, were investigated in high-fat diet-induced obese mice. The results indicate that obesity in mice increased the MKP-3 protein content in the hypothalamus. This hypothalamic upregulation led to an increase of food intake, adiposity, and body weight. Furthermore, the obese mice with increased MKP-3 showed an insulin signaling impairment with reduction of insulin-induced FoxO1 and Erk1/2 phosphorylation in the hypothalamus. Moreover, a bioinformatics analysis of data demonstrated that hypothalamic MKP-3 mRNA levels were positively correlated with body weight and negatively correlated to oxygen consumption (VO2) in BXD mice. Taken together, our study reports that obesity is associated with increased protein levels of hypothalamic MKP-3, which is related to the reduction of FoxO1 and Erk1/2 phosphorylation in the hypothalamus as well as to an increase in body weight and a reduction in energy expenditure.
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Affiliation(s)
- Bárbara de A Rodrigues
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Vitor R Muñoz
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Gabriel K Kuga
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil.,Post-Graduate Program in Movement Sciences, São Paulo State University (Unesp), Institute of Biosciences, São Paulo, Brazil
| | - Rafael C Gaspar
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Susana C B R Nakandakari
- OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Barbara M Crisol
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil
| | - José D Botezelli
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Luciana S S Pauli
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Adelino S R da Silva
- School of Physical Education and Sport of Ribeirão Preto, University of São Paulo (USP), São Paulo, Brazil
| | - Leandro P de Moura
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil.,OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), São Paulo, Brazil.,CEPECE-Center of Research in Sport Sciences, School of Applied Sciences, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Dennys E Cintra
- OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), São Paulo, Brazil.,Laboratory of Nutritional Genomics, University of Campinas (UNICAMP), São Paulo, Brazil
| | - Eduardo R Ropelle
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil.,OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), São Paulo, Brazil.,CEPECE-Center of Research in Sport Sciences, School of Applied Sciences, University of Campinas (UNICAMP), São Paulo, Brazil
| | - José R Pauli
- Laboratory of Molecular Biology of Exercise, University of Campinas (UNICAMP), São Paulo, Brazil.,OCRC-Obesity and Comorbidities Research Center, University of Campinas (UNICAMP), São Paulo, Brazil.,CEPECE-Center of Research in Sport Sciences, School of Applied Sciences, University of Campinas (UNICAMP), São Paulo, Brazil
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13
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Pfuhlmann K, Pfluger PT, Schriever SC, Müller TD, Tschöp MH, Stemmer K. Dual specificity phosphatase 6 deficiency is associated with impaired systemic glucose tolerance and reversible weight retardation in mice. PLoS One 2017; 12:e0183488. [PMID: 28873424 PMCID: PMC5584967 DOI: 10.1371/journal.pone.0183488] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 08/03/2017] [Indexed: 01/09/2023] Open
Abstract
Here, we aimed to investigate the potential role of DUSP6, a dual specificity phosphatase, that specifically inactivates extracellular signal-regulated kinase (ERK), for the regulation of body weight and glucose homeostasis. We further assessed whether metabolic challenges affect Dusp6 expression in selected brain areas or white adipose tissue. Hypothalamic Dusp6 mRNA levels remained unchanged in chow-fed lean vs. high fat diet (HFD) fed obese C57Bl/6J mice, and in C57Bl/6J mice undergoing prolonged fasting or refeeding with fat free diet (FFD) or HFD. Similarly, Dusp6 expression levels were unchanged in selected brain regions of Lepob mice treated with 1 mg/kg of leptin for 6 days, compared to pair-fed or saline-treated Lepob controls. Dusp6 expression levels remained unaltered in vitro in primary adipocytes undergoing differentiation, but were increased in eWAT of HFD-fed obese C57Bl/6J mice, compared to chow-fed lean controls. Global chow-fed DUSP6 KO mice displayed reduced body weight and lean mass and slightly increased fat mass at a young age, which is indicative for early-age weight retardation. Subsequent exposure to HFD led to a significant increase in lean mass and body weight in DUSP6 deficient mice, compared to WT controls. Nevertheless, after 26 weeks of high-fat diet exposure, we observed comparable body weight, fat and lean mass in DUSP6 WT and KO mice, suggesting overall normal susceptibility to develop obesity. In line with the increased weight gain to compensate for early-age weight retardation, HFD-fed DUSP6 KO displayed increased expression levels of anabolic genes involved in lipid and cholesterol metabolism in the epididymal white adipose tissue (eWAT), compared to WT controls. Glucose tolerance was perturbed in both chow-fed lean or HFD-fed obese DUSP6 KO, compared to their respective WT controls. Overall, our data indicate that DUSP6 deficiency has limited impact on the regulation of energy metabolism, but impairs systemic glucose tolerance. Our data are in conflict to earlier reports that propose protection from diet-induced obesity and glucose intolerance in DUSP6 deficient mice. Reasons for the discrepancies remain elusive, but may entail differential genetic backgrounds, environmental factors such as the type and source of HFD, or alterations in the gut microbiome between facilities.
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Affiliation(s)
- Katrin Pfuhlmann
- Research Unit NeuroBiology of Diabetes, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Division of Metabolic Diseases, Technische Universität München, Munich, Germany
| | - Paul T. Pfluger
- Research Unit NeuroBiology of Diabetes, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Sonja C. Schriever
- Research Unit NeuroBiology of Diabetes, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Timo D. Müller
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Matthias H. Tschöp
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- Division of Metabolic Diseases, Technische Universität München, Munich, Germany
| | - Kerstin Stemmer
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- * E-mail:
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14
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Rodrigues BDA, Kuga GK, Muñoz VR, Gaspar RC, Tavares MR, Botezelli JD, da Silva ASR, Cintra DE, de Moura LP, Simabuco FM, Ropelle ER, Pauli JR. Overexpression of Mitogen-activated protein kinase phosphatase-3 (MKP-3) reduces FoxO1 phosphorylation in mice hypothalamus. Neurosci Lett 2017; 659:14-17. [PMID: 28866049 DOI: 10.1016/j.neulet.2017.08.067] [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] [Received: 03/30/2017] [Revised: 08/11/2017] [Accepted: 08/29/2017] [Indexed: 10/18/2022]
Abstract
The mitogen-activated kinase phosphatase-3 (MKP-3) has gained great importance in the scientific community by acting as a regulator of the cell cycle through dephosphorylation of FoxO1, an important transcription factor involved in the insulin intracellular signaling cascade. When dephosphorylated and translocated to the nuclei, FoxO1 can promote the transcription of orexigenic neuropeptides (NPY/AgRP) in the hypothalamus, whereas insulin signaling is responsible for the disruption of this process. However, it is not understood if the hypothalamic activation of MKP-3 affects FoxO1 phosphorylation, and we hypothesized that MKP-3 overexpression reduces the capacity of the insulin signal to phosphorylate FoxO1. In the present study, we overexpressed the DUSP6 gene through an injection of adenovirus directly into the hypothalamic third ventricle of Swiss mice. The colocalization of the adenovirus was confirmed by the immunofluorescence assay. Then, MKP-3 overexpression resulted in a significant reduction of hypothalamic FoxO1 phosphorylation after insulin stimulation. This effect was independent of changes in Akt phosphorylation. Thus, the role of MKP-3 in the hypothalamus is closely associated with FoxO1 dephosphorylation and may provide a potential therapeutic target against hypothalamic disorders related to obesity and unbalanced food intake control.
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Affiliation(s)
| | - Gabriel Keine Kuga
- Post-Graduate Program in Movement Sciences, São Paulo State University (Unesp), Institute of Biosciences, Rio Claro, Sao Paulo, Brazil
| | | | | | | | | | | | | | | | | | | | - José Rodrigo Pauli
- School of Applied Sciences, University of Campinas, Limeira, SP, Brazil.
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15
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Shi W, Wang H, Zheng X, Jiang X, Xu Z, Shen H, Li M. HNF-4alpha Negatively Regulates Hepcidin Expression Through BMPR1A in HepG2 Cells. Biol Trace Elem Res 2017; 176:294-304. [PMID: 27660075 DOI: 10.1007/s12011-016-0846-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 09/06/2016] [Indexed: 12/19/2022]
Abstract
Hepcidin synthesis is reported to be inadequate according to the body iron store in patients with non-alcoholic fatty liver disease (NAFLD) undergoing hepatic iron overload (HIO). However, the underlying mechanisms remain unclear. We hypothesize that hepatocyte nuclear factor-4α (HNF-4α) may negatively regulate hepcidin expression and contribute to hepcidin deficiency in NAFLD patients. The effect of HNF-4α on hepcidin expression was observed by transfecting specific HNF-4α small interfering RNA (siRNA) or plasmids into HepG2 cells. Both direct and indirect mechanisms involved in the regulation of HNF-4α on hepcidin were detected by real-time PCR, Western blotting, chromatin immunoprecipitation (chIP), and reporter genes. It was found that HNF-4α suppressed hepcidin messenger RNA (mRNA) and protein expressions in HepG2 cells, and this suppressive effect was independent of the potential HNF-4α response elements. Phosphorylation of SMAD1 but not STAT3 was inactivated by HNF-4α, and the SMAD4 response element was found essential to HNF-4α-induced hepcidin reduction. Neither inhibitory SMADs, SMAD6, and SMAD7 nor BMPR ligands, BMP2, BMP4, BMP6, and BMP7 were regulated by HNF-4α in HepG2 cells. BMPR1A, but not BMPR1B, BMPR2, ActR2A, ActR2B, or HJV, was decreased by HNF-4α, and HNF4α-knockdown-induced stimulation of hepcidin could be entirely blocked when BMPR1A was interfered with at the same time. In conclusion, the present study suggests that HNF-4α has a suppressive effect on hepcidin expression by inactivating the BMP pathway, specifically via BMPR1A, in HepG2 cells.
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Affiliation(s)
- Wencai Shi
- Military Hygiene Department, Faculty of Naval Medicine, Second Military Medical University, No. 800 Xiangyin Road, Shanghai, 200433, China
- Department of Clinical Nutrition, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Heyang Wang
- Military Hygiene Department, Faculty of Naval Medicine, Second Military Medical University, No. 800 Xiangyin Road, Shanghai, 200433, China
| | - Xuan Zheng
- Department of Clinical Nutrition, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Xin Jiang
- Military Hygiene Department, Faculty of Naval Medicine, Second Military Medical University, No. 800 Xiangyin Road, Shanghai, 200433, China
| | - Zheng Xu
- Military Hygiene Department, Faculty of Naval Medicine, Second Military Medical University, No. 800 Xiangyin Road, Shanghai, 200433, China
| | - Hui Shen
- Military Hygiene Department, Faculty of Naval Medicine, Second Military Medical University, No. 800 Xiangyin Road, Shanghai, 200433, China
| | - Min Li
- Military Hygiene Department, Faculty of Naval Medicine, Second Military Medical University, No. 800 Xiangyin Road, Shanghai, 200433, China.
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16
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Kurauti MA, Costa-Júnior JM, Ferreira SM, Dos Santos GJ, Protzek AOP, Nardelli TR, de Rezende LF, Boschero AC. Acute exercise restores insulin clearance in diet-induced obese mice. J Endocrinol 2016; 229:221-32. [PMID: 27000684 DOI: 10.1530/joe-15-0483] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 03/21/2016] [Indexed: 01/19/2023]
Abstract
The aim of this study was to investigate the insulin clearance in diet-induced obese (DIO) mice submitted to acute endurance exercise (3h of treadmill exercise at 60-70% VO2max). Glucose-stimulated insulin secretion in isolated islets; ipGTT; ipITT; ipPTT; in vivo insulin clearance; protein expression in liver, skeletal muscle, and adipose tissue (insulin degrading enzyme (IDE), insulin receptor subunitβ(IRβ), phospho-Akt (p-Akt) and phospho-AMPK (p-AMPK)), and the activity of IDE in the liver and skeletal muscle were accessed. In DIO mice, acute exercise reduced fasting glycemia and insulinemia, improved glucose and insulin tolerance, reduced hepatic glucose production, and increased p-Akt protein levels in liver and skeletal muscle and p-AMPK protein levels in skeletal muscle. In addition, insulin secretion was reduced, whereas insulin clearance and the expression of IDE and IRβ were increased in liver and skeletal muscle. Finally, IDE activity was increased only in skeletal muscle. In conclusion, we propose that the increased insulin clearance and IDE expression and activity, primarily, in skeletal muscle, constitute an additional mechanism, whereby physical exercise reduces insulinemia in DIO mice.
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Affiliation(s)
- Mirian A Kurauti
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
| | - José M Costa-Júnior
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
| | - Sandra M Ferreira
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
| | - Gustavo J Dos Santos
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
| | - André O P Protzek
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
| | - Tarlliza R Nardelli
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
| | - Luiz F de Rezende
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
| | - Antonio C Boschero
- Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas (UNICAMP), Campinas, Brazil
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17
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Bedinger DH, Adams SH. Metabolic, anabolic, and mitogenic insulin responses: A tissue-specific perspective for insulin receptor activators. Mol Cell Endocrinol 2015; 415:143-56. [PMID: 26277398 DOI: 10.1016/j.mce.2015.08.013] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 08/05/2015] [Accepted: 08/09/2015] [Indexed: 12/17/2022]
Abstract
Insulin acts as the major regulator of the fasting-to-fed metabolic transition by altering substrate metabolism, promoting energy storage, and helping activate protein synthesis. In addition to its glucoregulatory and other metabolic properties, insulin can also act as a growth factor. The metabolic and mitogenic responses to insulin are regulated by divergent post-receptor signaling mechanisms downstream from the activated insulin receptor (IR). However, the anabolic and growth-promoting properties of insulin require tissue-specific inter-relationships between the two pathways, and the nature and scope of insulin-regulated processes vary greatly across tissues. Understanding the nuances of this interplay between metabolic and growth-regulating properties of insulin would have important implications for development of novel insulin and IR modulator therapies that stimulate insulin receptor activation in both pathway- and tissue-specific manners. This review will provide a unique perspective focusing on the roles of "metabolic" and "mitogenic" actions of insulin signaling in various tissues, and how these networks should be considered when evaluating selective pharmacologic approaches to prevent or treat metabolic disease.
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Affiliation(s)
| | - Sean H Adams
- Arkansas Children's Nutrition Center and University of Arkansas for Medical Sciences, Department of Pediatrics, Little Rock, AR, USA
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18
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da Rocha AL, Pereira BC, Pauli JR, Cintra DE, de Souza CT, Ropelle ER, R. da Silva AS. Downhill Running-Based Overtraining Protocol Improves Hepatic Insulin Signaling Pathway without Concomitant Decrease of Inflammatory Proteins. PLoS One 2015; 10:e0140020. [PMID: 26445495 PMCID: PMC4596708 DOI: 10.1371/journal.pone.0140020] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 09/19/2015] [Indexed: 11/21/2022] Open
Abstract
The purpose of this study was to verify the effects of overtraining (OT) on insulin, inflammatory and gluconeogenesis signaling pathways in the livers of mice. Rodents were divided into control (CT), overtrained by downhill running (OTR/down), overtrained by uphill running (OTR/up) and overtrained by running without inclination (OTR). Rotarod, incremental load, exhaustive and grip force tests were used to evaluate performance. Thirty-six hours after a grip force test, the livers were extracted for subsequent protein analyses. The phosphorylation of insulin receptor beta (pIRbeta), glycogen synthase kinase 3 beta (pGSK3beta) and forkhead box O1 (pFoxo1) increased in OTR/down versus CT. pGSK3beta was higher in OTR/up versus CT, and pFoxo1 was higher in OTR/up and OTR versus CT. Phosphorylation of protein kinase B (pAkt) and insulin receptor substrate 1 (pIRS–1) were higher in OTR/up versus CT and OTR/down. The phosphorylation of IκB kinase alpha and beta (pIKKalpha/beta) was higher in all OT protocols versus CT, and the phosphorylation of stress-activated protein kinases/Jun amino-terminal kinases (pSAPK-JNK) was higher in OTR/down versus CT. Protein levels of peroxisome proliferator-activated receptor-gamma coactivator 1alpha (PGC-1alpha) and hepatocyte nuclear factor 4alpha (HNF-4alpha) were higher in OTR versus CT. In summary, OTR/down improved the major proteins of insulin signaling pathway but up-regulated TRB3, an Akt inhibitor, and its association with Akt.
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Affiliation(s)
- Alisson L. da Rocha
- Postgraduate Program in Rehabilitation and Functional Performance, RibeirãoPreto Medical School, USP, RibeirãoPreto, São Paulo, Brazil
| | - Bruno C. Pereira
- Postgraduate Program in Rehabilitation and Functional Performance, RibeirãoPreto Medical School, USP, RibeirãoPreto, São Paulo, Brazil
| | - José R. Pauli
- Sport Sciences Course, Faculty of Applied Sciences, State University of Campinas, Limeira, São Paulo, Brazil
| | - Dennys E. Cintra
- Sport Sciences Course, Faculty of Applied Sciences, State University of Campinas, Limeira, São Paulo, Brazil
| | - Claudio T. de Souza
- Exercise Biochemistry and Physiology Laboratory Postgraduate Program in Health Sciences, Health Sciences Unit, University of Far Southern Santa Catarina, Criciúma, Santa Catarina, Brazil
| | - Eduardo R. Ropelle
- Sport Sciences Course, Faculty of Applied Sciences, State University of Campinas, Limeira, São Paulo, Brazil
| | - Adelino S. R. da Silva
- Postgraduate Program in Rehabilitation and Functional Performance, RibeirãoPreto Medical School, USP, RibeirãoPreto, São Paulo, Brazil
- School of Physical Education and Sport of RibeirãoPreto, University of São Paulo, RibeirãoPreto, São Paulo, Brazil
- * E-mail:
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Reynolds TH, Banerjee S, Sharma VM, Donohue J, Couldwell S, Sosinsky A, Frulla A, Robinson A, Puri V. Effects of a High Fat Diet and Voluntary Wheel Running Exercise on Cidea and Cidec Expression in Liver and Adipose Tissue of Mice. PLoS One 2015; 10:e0130259. [PMID: 26176546 PMCID: PMC4503728 DOI: 10.1371/journal.pone.0130259] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 05/19/2015] [Indexed: 11/19/2022] Open
Abstract
Cidea and Cidec play an important role in regulating triglyceride storage in liver and adipose tissue. It is not known if the Cidea and Cidec genes respond to a high fat diet (HFD) or exercise training, two interventions that alter lipid storage. The purpose of the present study was to determine the effect of a HFD and voluntary wheel running (WR) on Cidea and Cidec mRNA and protein expression in adipose tissue and liver of mice. A HFD promoted a significant increase in Cidea and Cidec mRNA levels in adipose tissue and liver. The increase in Cidea and Cidec mRNAs in adipose tissue and liver in response to a HFD was prevented by WR. Similar to the changes in Cidea mRNA, Cidea protein levels in adipose tissue significantly increased in response to a HFD, a process that was, again, prevented by WR. However, in adipose tissue the changes in Cidec mRNA did not correspond to the changes in Cidec protein levels, as a HFD decreased Cidec protein abundance. Interestingly, in adipose tissue Cidea protein expression was significantly related to body weight (R=.725), epididymal adipose tissue (EWAT) mass (R=.475) and insulin resistance (R=.706), whereas Cidec protein expression was inversely related to body weight (R=-.787), EWAT mass (R=-.706), and insulin resistance (R=-.679). Similar to adipose tissue, Cidea protein expression in liver was significantly related to body weight (R=.660), EWAT mass (R=.468), and insulin resistance (R=.599); however, unlike adipose tissue, Cidec protein levels in liver were not related to body weight or EWAT mass and only moderately associated with insulin resistance (R=-.422, P=0.051). Overall, our findings indicate that Cidea is highly associated with adiposity and insulin resistance, whereas Cidec is related to insulin sensitivity. The present study suggests that Cide proteins might play an important functional role in the development of obesity, hepatic steatosis, as well as the pathogenesis of type 2 diabetes.
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Affiliation(s)
- Thomas H. Reynolds
- Department of Health and Exercise Sciences, Skidmore College, Saratoga Springs, NY, 12866, United States of America
- * E-mail:
| | - Sayani Banerjee
- Department of Medicine, Section of Endocrinology, Diabetes and Nutrition, Boston University, Boston, MA, 02118, United States of America
| | - Vishva Mitra Sharma
- Department of Medicine, Section of Endocrinology, Diabetes and Nutrition, Boston University, Boston, MA, 02118, United States of America
| | - Jacob Donohue
- Department of Health and Exercise Sciences, Skidmore College, Saratoga Springs, NY, 12866, United States of America
| | - Sandrine Couldwell
- Department of Health and Exercise Sciences, Skidmore College, Saratoga Springs, NY, 12866, United States of America
| | - Alexandra Sosinsky
- Department of Health and Exercise Sciences, Skidmore College, Saratoga Springs, NY, 12866, United States of America
| | - Ashton Frulla
- Department of Health and Exercise Sciences, Skidmore College, Saratoga Springs, NY, 12866, United States of America
| | - Allegra Robinson
- Department of Health and Exercise Sciences, Skidmore College, Saratoga Springs, NY, 12866, United States of America
| | - Vishwajeet Puri
- Department of Medicine, Section of Endocrinology, Diabetes and Nutrition, Boston University, Boston, MA, 02118, United States of America
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20
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Winiarska K, Jarzyna R, Dzik JM, Jagielski AK, Grabowski M, Nowosielska A, Focht D, Sierakowski B. ERK1/2 pathway is involved in renal gluconeogenesis inhibition under conditions of lowered NADPH oxidase activity. Free Radic Biol Med 2015; 81:13-21. [PMID: 25601753 DOI: 10.1016/j.freeradbiomed.2014.12.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 11/27/2014] [Accepted: 12/26/2014] [Indexed: 01/11/2023]
Abstract
The aim of this study was to elucidate the mechanisms involved in the inhibition of renal gluconeogenesis occurring under conditions of lowered activity of NADPH oxidase (Nox), the enzyme considered to be one of the main sources of reactive oxygen species in kidneys. The in vitro experiments were performed on primary cultures of rat renal proximal tubules, with the use of apocynin, a selective Nox inhibitor, and TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl), a potent superoxide radical scavenger. In the in vivo experiments, Zucker diabetic fatty (ZDF) rats, a well established model of diabetes type 2, were treated with apocynin solution in drinking water. The main in vitro findings are the following: (1) both apocynin and TEMPOL attenuate the rate of gluconeogenesis, inhibiting the step catalyzed by phosphoenolpyruvate carboxykinase (PEPCK), a key enzyme of the process; (2) in the presence of the above-noted compounds the expression of PEPCK and the phosphorylation of transcription factor CREB and ERK1/2 kinases are lowered; (3) both U0126 (MEK inhibitor) and 3-(2-aminoethyl)-5-((4-ethoxyphenyl)methylene)-2,4-thiazolidinedione (ERK inhibitor) diminish the rate of glucose synthesis via mechanisms similar to those of apocynin and TEMPOL. The observed apocynin in vivo effects include: (1) slight attenuation of hyperglycemia; (2) inhibition of renal gluconeogenesis; (3) a decrease in renal PEPCK activity and content. In view of the results summarized above, it can be concluded that: (1) the lowered activity of the ERK1/2 pathway is of importance for the inhibition of renal gluconeogenesis found under conditions of lowered superoxide radical production by Nox; (2) the mechanism of this phenomenon includes decreased PEPCK expression, resulting from diminished activity of transcription factor CREB; (3) apocynin-evoked inhibition of renal gluconeogenesis contributes to the hypoglycemic action of this compound observed in diabetic animals. Thus, the study has delivered some new insights into the recently discussed issue of the usefulness of Nox inhibition as a potential antidiabetic strategy.
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Affiliation(s)
- Katarzyna Winiarska
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Robert Jarzyna
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Jolanta M Dzik
- Department of Biochemistry, Faculty of Agriculture and Biology, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159, 02-776 Warsaw, Poland
| | - Adam K Jagielski
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Michal Grabowski
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Agata Nowosielska
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Dorota Focht
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Bartosz Sierakowski
- Department of Metabolic Regulation, Institute of Biochemistry, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland
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21
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Khadir A, Tiss A, Abubaker J, Abu-Farha M, Al-Khairi I, Cherian P, John J, Kavalakatt S, Warsame S, Al-Madhoun A, Al-Ghimlas F, Elkum N, Behbehani K, Dermime S, Dehbi M. MAP kinase phosphatase DUSP1 is overexpressed in obese humans and modulated by physical exercise. Am J Physiol Endocrinol Metab 2015; 308:E71-83. [PMID: 25370852 DOI: 10.1152/ajpendo.00577.2013] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Chronic low-grade inflammation and dysregulation of the stress defense system are cardinal features of obesity, a major risk factor for the development of insulin resistance and diabetes. Dual-specificity protein phosphatase 1 (DUSP1), known also as MAP kinase phosphatase 1 (MKP1), is implicated in metabolism and energy expenditure. Mice lacking DUSP1 are resistant to high-fat diet-induced obesity. However, the expression of DUSP1 has not been investigated in human obesity. In the current study, we compared the expression pattern of DUSP1 between lean and obese nondiabetic human subjects using subcutaneous adipose tissue (SAT) and peripheral blood mononuclear cells (PBMCs). The levels of DUSP1 mRNA and protein were significantly increased in obese subjects with concomitant decrease in the phosphorylation of p38 MAPK (p-p38 MAPK) and PGC-1α and an increase in the levels of phospho-JNK (p-JNK) and phospho-ERK (p-ERK). Moreover, obese subjects had higher levels of circulating DUSP1 protein that correlated positively with various obesity indicators, triglycerides, glucagon, insulin, leptin, and PAI-1 (P < 0.05) but negatively with V̇O(2max) and high-density lipoprotein (P < 0.05). The observation that DUSP1 was overexpressed in obese subjects prompted us to investigate whether physical exercise could reduce its expression. In this study, we report for the first time that physical exercise significantly attenuated the expression of DUSP1 in both the SAT and PBMCs, with a parallel increase in the expression of PGC-1α and a reduction in the levels of p-JNK and p-ERK along with attenuated inflammatory response. Collectively, our data suggest that DUSP1 upregulation is strongly linked to adiposity and that physical exercise modulates its expression. This gives further evidence that exercise might be useful as a strategy for managing obesity and preventing its associated complications.
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Affiliation(s)
| | - Ali Tiss
- Deptartment of Biomedical Research
| | | | | | | | | | | | | | | | | | | | - Naser Elkum
- Department of Biostatistics and Epidemiology, Dasman Diabetes Institute, Kuwait City, Kuwait
| | - Kazem Behbehani
- Deptartment of Biomedical Research, Fitness and Rehabilitation Center, and Department of Biostatistics and Epidemiology, Dasman Diabetes Institute, Kuwait City, Kuwait
| | - Said Dermime
- King Fahad Specialist Hospital, Dammam, Saudi Arabia; and
| | - Mohammed Dehbi
- Diabetes Research Centre, Qatar Biomedical Research Institute, Qatar Foundation, Doha, Qatar
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