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Nong R, Qin C, Lin Q, Lu Y, Li J. Down-regulated HDAC1 and up-regulated microRNA-124-5p recover myocardial damage of septic mice. Bioengineered 2022; 13:7168-7180. [PMID: 35285407 PMCID: PMC9278975 DOI: 10.1080/21655979.2022.2034583] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Studies have revealed the relationship between histone deacetylases (HDACs)/microRNAs (miRNAs) and sepsis, but little has ever investigated the mechanism of HDAC1/miR-124-5p in sepsis. Herein, we studied the impacts of HDAC1/miR-124-5p on myocardial damage of septic mice via regulating high-mobility group box chromosomal protein 1 (HMGB1). Septic mice were induced by cecal ligation and puncture. HDAC1, miR-124-5p and HMGB1 expression in myocardial tissues of septic mice were detected. Septic mice were injected with HDAC1 low expression-, miR-124-5p high expression- or HMGB1 low expression-related structures to observe cardiac function, inflammatory response, oxidative stress response, myocardial pathological changes and apoptosis in myocardial tissues of septic mice. The relationship of HDAC1/miR-124-5p/HMGB1 was verified. HDAC1 and HMGB1 expression were upregulated while miR-124-5p expression was decreased in myocardial tissues of septic mice. Restored miR-124-5p/depleted HDAC1 or HMGB1 recovered the cardiac function, improved cardiac function, inflammatory response, oxidative stress response, myocardial pathological changes and inhibit ed cardiomyocyte apoptosis in septic mice. HDAC1 bound to miR-124-5p which directly targeted HMGB1. This study suggests that down-regulated HDAC1 or up-regulated miR-124-5p recovers myocardial damage of septic mice via decreasing HMGB1.
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Affiliation(s)
- Rongmao Nong
- Department of Icu (Intensive Care Unit), The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, China
- The First Clinical Medical College of Jinan University, Guangzhou, China
| | - Chunyan Qin
- Department of Icu (Intensive Care Unit), The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, China
- The First Clinical Medical College of Jinan University, Guangzhou, China
| | - Qiqing Lin
- Emergency Department, Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, China
| | - Yi Lu
- The First Clinical Medical College of Jinan University, Guangzhou, China
| | - Jun Li
- The First Clinical Medical College of Jinan University, Guangzhou, China
- Department of Respiratory Medicine, The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, China
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Liu YZ, Xu MY, Dai XY, Yan L, Li L, Zhu RZ, Ren LJ, Zhang JQZ, Zhang XF, Li JF, Tian YJ, Shi WJ, Liu YQ, Jiang CL, Zhu JB, Chen JK. Pyruvate Kinase M2 Mediates Glycolysis Contributes to Psoriasis by Promoting Keratinocyte Proliferation. Front Pharmacol 2021; 12:765790. [PMID: 34733164 PMCID: PMC8558409 DOI: 10.3389/fphar.2021.765790] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 10/04/2021] [Indexed: 12/11/2022] Open
Abstract
Psoriasis is characterized by keratinocyte proliferation and immune cell infiltration. M2 isoform of pyruvate kinase (PKM2) was reported to have an important role in cell proliferation, which is a rate-limiting enzyme that regulates the final step of glycolysis. However, how PKM2 regulates cell metabolism and proliferation in psoriatic keratinocytes is still poorly understood. Interestingly, we found that PKM2 was highly expressed in psoriatic epidermis from patients and mouse models. PKM2 overexpression promoted keratinocyte glycolytic metabolism while knockdown inhibited keratinocyte proliferation and glycolysis. Mice lacking PKM2 specifically in keratinocytes, pharmacological inhibition of PKM2 or glycolysis inhibited keratinocyte proliferation and showed obvious remission in an imiquimod-induced psoriatic mouse model. Moreover, the inhibitor of the EGF-receptor blocked EGF-stimulated PKM2 expression and glycolysis in keratinocytes. We identify PKM2 as an upregulated gene in psoriasis. PKM2 is essential in keratinocyte over-proliferation and may represent a therapeutic target for psoriasis.
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Affiliation(s)
- Yun-Zi Liu
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China.,Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Ming-Yuan Xu
- Department of Dermatopathology, Shanghai Skin Disease Hospital Affiliated to Tongji University, Shanghai, China
| | - Xiao-Yu Dai
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Lang Yan
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Lei Li
- The Second Naval Hospital of the Southern Theater of the Chinese People's Liberation Army, Hainan, China
| | - Rui-Zhen Zhu
- Department of Dermatopathology, Shanghai Skin Disease Hospital Affiliated to Tongji University, Shanghai, China
| | - Li-Jun Ren
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Ji-Qian-Zhu Zhang
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Xiao-Fang Zhang
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Jin-Feng Li
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Yi-Jun Tian
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Wen-Jing Shi
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Ye-Qiang Liu
- Department of Dermatopathology, Shanghai Skin Disease Hospital Affiliated to Tongji University, Shanghai, China
| | - Chun-Lei Jiang
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Jiang-Bo Zhu
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Ji-Kuai Chen
- Department of Health Toxicology, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
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Okan A, Doğanyiğit Z, Eroğlu E, Akyüz E, Demir N. Immunoreactive definition of TNF- α, HIF-1 α, Kir6.2, Kir3.1 and M2 muscarinic receptor for cardiac and pancreatic tissues in a mouse model for type 1 diabetes. Life Sci 2021; 284:119886. [PMID: 34389402 DOI: 10.1016/j.lfs.2021.119886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 08/02/2021] [Accepted: 08/03/2021] [Indexed: 11/25/2022]
Affiliation(s)
- Aslı Okan
- Department of Histology and Embryology, School of Medicine, Yozgat Bozok University, Yozgat 66100, Turkey
| | - Züleyha Doğanyiğit
- Department of Histology and Embryology, School of Medicine, Yozgat Bozok University, Yozgat 66100, Turkey
| | - Ece Eroğlu
- School of Medicine, Yozgat Bozok University, Yozgat 66100, Turkey
| | - Enes Akyüz
- Department of Biophysics, School of International Medicine, University of Health Sciences, Istanbul 34668, Turkey
| | - Necdet Demir
- Department of Histology and Embryology, School of Medicine, Akdeniz University, Antalya 07070, Turkey.
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Glucagon-Like Peptide-1 Analog Liraglutide Attenuates Pressure-Overload Induced Cardiac Hypertrophy and Apoptosis through Activating ATP Sensitive Potassium Channels. Cardiovasc Drugs Ther 2020; 35:87-101. [PMID: 33057968 DOI: 10.1007/s10557-020-07088-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/22/2020] [Indexed: 12/16/2022]
Abstract
PURPOSE This study aimed to investigate whether inhibition of glucagon-like peptide-1 (GLP-1) on pressure overload induced cardiac hypertrophy and apoptosis is related to activation of ATP sensitive potassium (KATP) channels. METHODS Male SD rats were randomly divided into five groups: sham, control (abdominal aortic constriction), GLP-1 analog liraglutide (0.3 mg/kg/twice day), KATP channel blocker glibenclamide (5 mg/kg/day), and liraglutide plus glibenclamide. RESULTS Relative to the control on week 16, liraglutide upregulated protein and mRNA levels of KATP channel subunits Kir6.2/SUR2 and their expression in the myocardium, vascular smooth muscle, aortic endothelium, and cardiac microvasculature. Consistent with a reduction in aortic wall thickness (61.4 ± 7.6 vs. 75.0 ± 7.6 μm, p < 0.05), liraglutide enhanced maximal aortic endothelium-dependent relaxation in response to acetylcholine (71.9 ± 8.7 vs. 38.6 ± 4.8%, p < 0.05). Along with a reduction in heart to body weight ratio (2.6 ± 0.1 vs. 3.4 ± 0.4, mg/g, p < 0.05) by liraglutide, hypertrophied cardiomyocytes (371.0 ± 34.4 vs. 933.6 ± 156.6 μm2, p < 0.05) and apoptotic cells (17.5 ± 8.2 vs. 44.7 ± 7.9%, p < 0.05) were reduced. Expression of anti-apoptotic protein BCL-2 and contents of myocardial ATP were augmented, and expression of cleaved-caspase 3 and levels of serum Tn-I/-T were reduced. Echocardiography and hemodynamic measurement showed that cardiac systolic function was enhanced as evidenced by increased ejection fraction (88.4 ± 4.8 vs. 73.8 ± 5.1%, p < 0.05) and left ventricular systolic pressure (105.2 ± 10.8 vs. 82.7 ± 7.9 mmHg, p < 0.05), and diastolic function was preserved as shown by a reduction of ventricular end-diastolic pressure (-3.1 ± 2.9 vs. 6.7 ± 2.8 mmHg, p < 0.05). Furthermore, left ventricular internal diameter at end-diastole (5.8 ± 0.5 vs. 7.7 ± 0.6 mm, p < 0.05) and left ventricular internal diameter at end-systole (3.0 ± 0.6 vs. 4.7 ± 0.4 mm, p < 0.05) were improved. Dietary administration of glibenclamide alone did not alter all the parameters measured but significantly blocked liraglutide-exerted cardioprotection. CONCLUSION Liraglutide ameliorates cardiac hypertrophy and apoptosis, potentially via activating KATP channel-mediated signaling pathway. These data suggest that liraglutide might be considered as an adjuvant therapy to treat patients with heart failure.
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Zhao G, Wang X, Edwards S, Dai M, Li J, Wu L, Xu R, Han J, Yuan H. NLRX1 knockout aggravates lipopolysaccharide (LPS)-induced heart injury and attenuates the anti-LPS cardioprotective effect of CYP2J2/11,12-EET by enhancing activation of NF-κB and NLRP3 inflammasome. Eur J Pharmacol 2020; 881:173276. [PMID: 32574674 DOI: 10.1016/j.ejphar.2020.173276] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 06/01/2020] [Accepted: 06/09/2020] [Indexed: 12/15/2022]
Abstract
NLRX1 weakens lipopolysaccharide (LPS)-induced NF-κB activation on immune cells. Cytochrome P450 epoxygenase 2J2 (CYP2J2) attenuates LPS-induced cardiac injury by inhibiting NF-κB activation. However, it is still unclear whether NLRX1 could reduce LPS-induced heart damage and whether it is involved in the anti-LPS cardioprotective effect of CYP2J2. In this study, we found that NLRX1 knockout further exacerbated LPS-induced heart injury and up-regulated the proinflammatory cytokines in serum and heart tissue, and weakened the inhibitory effect of CYP2J2 on the harmful effects caused by LPS. We also found that LPS treatment induced ubiquitination of NLRX1 and promoted its binding to IKKα/β in myocardial tissue, which should theoretically inhibit NF-κB activation. However, LPS eventually leads to activation of NF-κB and NLRP3 inflammasome. Under the action of LPS, CYP2J2 further promoted the ubiquitination of NLRX1 and its binding to IKKα/β, impaired NF-κB activation and NLRP3 inflammasome activation. NLRX1 knockout notably aggravated LPS-induced NF-κB activation and NLRP3 inflammasome activation, and attenuated the inhibitory effects of CYP2J2 on NF-κB signal and NLRP3 inflammasome. More, CYP2J2 reduced LPS-induced reactive oxygen species (ROS) production and mitochondrial depolarization in heart cells, thereby inhibiting NLRP3 inflammasome activation. NLRX1 knockdown aggravated mitochondrial depolarization induced by LPS and weakened the protective effect of CYP2J2 on mitochondrial potential, although it had no significant effect on reactive oxygen species production. Together, these findings demonstrated that NLRX1 knockout aggravated LPS-induced heart injury and weakened the anti-LPS cardioprotective effect of CYP2J2 by enhancing activation of NF-κB and NLRP3 inflammasome.
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Affiliation(s)
- Gang Zhao
- Department of Cardiology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, 250021, PR China; Key Laboratory for Rare Disease Research of Shandong Province, Shandong Medical Biotechnological Center, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, 250021, PR China.
| | - Xiaoting Wang
- Department of Otolaryngology, Head and Neck Surgery & Sleep Medicine Center, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, 250021, PR China
| | - Sabrina Edwards
- Oregon Institute of Occupational Health Science, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, 97239, USA
| | - Meiyan Dai
- Department of Internal Medicine and Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, PR China
| | - Jianfeng Li
- Department of Otolaryngology, Head and Neck Surgery & Sleep Medicine Center, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, 250021, PR China
| | - Lujin Wu
- Department of Internal Medicine and Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, PR China
| | - Rong Xu
- Department of Cardiology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, 250021, PR China
| | - Jinxiang Han
- Key Laboratory for Rare Disease Research of Shandong Province, Shandong Medical Biotechnological Center, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, Shandong, 250021, PR China
| | - Haitao Yuan
- Department of Cardiology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, 250021, PR China.
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Gao F, Yang YZ, Feng XY, Fan TT, Jiang L, Guo R, Liu Q. Interleukin-27 is elevated in sepsis-induced myocardial dysfunction and mediates inflammation. Cytokine 2016; 88:1-11. [PMID: 27525353 DOI: 10.1016/j.cyto.2016.08.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 08/01/2016] [Accepted: 08/06/2016] [Indexed: 10/21/2022]
Abstract
INTRODUCTION Interleukin (IL)-27 is an important cytokine involved in many human inflammatory diseases. In this study, we investigated its role in the pathogenesis of sepsis-induced myocardial dysfunction (SIMD). METHODS Twenty patients with SIMD and 24healthy donors were prospectively enrolled. Expression of IL-27 was detected in serum from SIMD patients by ELISA. Cardiac dysfunction was induced by administration of Escherichia coli lipopolysaccharide (LPS) to C57BL/6 (wild type) or IL-27R-/- mice. IL-27 mRNA in the myocardium was measured by RT-PCR. Cytokine levels in serum were determined by ELISA. RESULTS Expression of IL-27 in the serum was markedly increased in patients with SIMD compared with that in controls. Serum IL-27 levels and cardiac IL-27 mRNA expression were significantly increased after LPS injection compared with control specimens. Compared with wild-type mice, IL-27R-/- mice had higher expression of brain natriuretic peptide, cardiac troponin I, IL-6, IL-12, tumor necrosis factor-α and transforming growth factor-β. CONCLUSIONS IL-27 is an important protective mediator of SIMD.
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Affiliation(s)
- Feng Gao
- Department of Anesthesia, Stomatology Hospital of Chongqing Medical University, No. 426 Songshibei Road, Yubei District, Chongqing 401146, China.
| | - Yuan-Zheng Yang
- Department of Emergency, The First Affiliated Hospital of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, China; Department of Critical Care Medicine, The Affiliated Hospital of Hainan Medical College, No. 31 Hualong Road, Xinhua District, Hainan 571101, China.
| | - Xuan-Yun Feng
- Department of Emergency, The First Affiliated Hospital of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, China.
| | - Ting-Ting Fan
- Department of Emergency, The First Affiliated Hospital of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, China.
| | - Long Jiang
- Department of Emergency, The First Affiliated Hospital of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, China.
| | - Rui Guo
- Department of Emergency, The First Affiliated Hospital of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, China.
| | - Qiong Liu
- Department of Emergency, The First Affiliated Hospital of Chongqing Medical University, No. 1 Youyi Road, Yuzhong District, Chongqing 400016, China.
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Zhang X, Zhang X, Xiong Y, Xu C, Liu X, Lin J, Mu G, Xu S, Liu W. Sarcolemmal ATP-sensitive potassium channel protects cardiac myocytes against lipopolysaccharide-induced apoptosis. Int J Mol Med 2016; 38:758-66. [PMID: 27430376 PMCID: PMC4990318 DOI: 10.3892/ijmm.2016.2664] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 06/21/2016] [Indexed: 02/01/2023] Open
Abstract
The sarcolemmal ATP-sensitive K+ (sarcKATP) channel plays a cardioprotective role during stress. However, the role of the sarcKATP channel in the apoptosis of cardiomyocytes and association with mitochondrial calcium remains unclear. For this purpose, we developed a model of LPS-induced sepsis in neonatal rat cardiomyocytes (NRCs). The TUNEL assay was performed in order to detect the apoptosis of cardiac myocytes and the MTT assay was performed to determine cellular viability. Exposure to LPS significantly decreased the viability of the NRCs as well as the expression of Bcl-2, whereas it enhanced the activity and expression of the apoptosis-related proteins caspase-3 and Bax, respectively. The sarcKATP channel blocker, HMR-1098, increased the apoptosis of NRCs, whereas the specific sarcKATP channel opener, P-1075, reduced the apoptosis of NRCs. The mitochondrial calcium uniporter inhibitor ruthenium red (RR) partially inhibited the pro-apoptotic effect of HMR-1098. In order to confirm the role of the sarcKATP channel, we constructed a recombinant adenovirus vector carrying the sarcKATP channel mutant subunit Kir6.2AAA to inhibit the channel activity. Kir6.2AAA adenovirus infection in NRCs significantly aggravated the apoptosis of myocytes induced by LPS. Elucidating the regulatory mechanisms of the sarcKATP channel in apoptosis may facilitate the development of novel therapeutic targets and strategies for the management of sepsis and cardiac dysfunction.
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Affiliation(s)
- Xiaohui Zhang
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
| | - Xiaohua Zhang
- Cardiac Signaling Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Yiqun Xiong
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
| | - Chaoying Xu
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
| | - Xinliang Liu
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
| | - Jian Lin
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
| | - Guiping Mu
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
| | - Shaogang Xu
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
| | - Wenhe Liu
- Central Laboratory, Shenzhen Hospital Affiliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen, Guangdong 518033, P.R. China
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Li SS, Cui N, Yang Y, Trower TC, Wei YM, Wu Y, Zhang S, Jin X, Jiang C. Impairment of the Vascular KATP Channel Imposes Fatal Susceptibility to Experimental Diabetes Due to Multi-Organ Injuries. J Cell Physiol 2015; 230:2915-26. [PMID: 25825210 DOI: 10.1002/jcp.25003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 03/25/2015] [Indexed: 12/19/2022]
Abstract
The vascular isoform of ATP-sensitive K(+) (KATP ) channels regulates blood flow to all organs. The KATP channel is strongly inhibited by reactive oxygen and carbonyl species produced in diabetic tissue inflammation. To address how such channel inhibition impacts vascular regulation as well as tissue viability, we performed studies in experimental diabetic mice. Strikingly, we found that knockout of the Kcnj8 encoding Kir6.1 subunit (Kcnj8-KO) caused mice to be fatally susceptible to diabetes. Organ perfusion studies suggested that the lack of this vascular K(+) channel handicapped activity-dependent vasodilation, leading to hypoperfusion, tissue hypoxia, and multi-organ failure. Morphologically, Kcnj8-KO mice showed greater inflammatory cell infiltration, higher levels of expression of inflammation indicator proteins, more severe cell apoptosis, and worse tissue disruptions. These were observed in the kidney, liver, and heart under diabetic condition in parallel comparison to tissues from WT mice. Patch clamping and molecular studies showed that the KATP channel was S-glutathionylated in experimental diabetes contributing to the inhibition of channel activity as well as the reduced arterial responses to vasodilators. These results suggest that the vascular KATP channel is organ protective in diabetic condition, and since the channel is suppressed by diabetic oxidative stress, therapeutical interventions to the maintenance of functional KATP channels may help to lower or prevent diabetic organ dysfunction.
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Affiliation(s)
- Shan-Shan Li
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia.,Harbin Medical University School of Pharmacy, Harbin, Heilongjiang, China
| | - Ningren Cui
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
| | - Yang Yang
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
| | - Timothy C Trower
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
| | - Yu-Min Wei
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
| | - Yang Wu
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
| | - Shuang Zhang
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
| | - Xin Jin
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
| | - Chun Jiang
- Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, Georgia
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Tissue inflammation and nitric oxide-mediated alterations in cardiovascular function are major determinants of endotoxin-induced insulin resistance. Cardiovasc Diabetol 2015; 14:56. [PMID: 25986700 PMCID: PMC4484635 DOI: 10.1186/s12933-015-0223-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 05/05/2015] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Endotoxin (i.e. LPS) administration induces a robust inflammatory response with accompanying cardiovascular dysfunction and insulin resistance. Overabundance of nitric oxide (NO) contributes to the vascular dysfunction. However, inflammation itself also induces insulin resistance in skeletal muscle. We sought to investigate whether the cardiovascular dysfunction induced by increased NO availability without inflammatory stress can promote insulin resistance. Additionally, we examined the role of inducible nitric oxide synthase (iNOS or NOS2), the source of the increase in NO availability, in modulating LPS-induced decrease in insulin-stimulated muscle glucose uptake (MGU). METHODS The impact of NO donor infusion on insulin-stimulated whole-body and muscle glucose uptake (hyperinsulinemic-euglycemic clamps), and the cardiovascular system was assessed in chronically catheterized, conscious mice wild-type (WT) mice. The impact of LPS on insulin action and the cardiovascular system were assessed in WT and global iNOS knockout (KO) mice. Tissue blood flow and cardiac function were assessed using microspheres and echocardiography, respectively. Insulin signaling activity, and gene expression of pro-inflammatory markers were also measured. RESULTS NO donor infusion decreased mean arterial blood pressure, whole-body glucose requirements, and MGU in the absence of changes in skeletal muscle blood flow. LPS lowered mean arterial blood pressure and glucose requirements in WT mice, but not in iNOS KO mice. Lastly, despite an intact inflammatory response, iNOS KO mice were protected from LPS-mediated deficits in cardiac output. LPS impaired MGU in vivo, regardless of the presence of iNOS. However, ex vivo, insulin action in muscle obtained from LPS treated iNOS KO animals was protected. CONCLUSION Nitric oxide excess and LPS impairs glycemic control by diminishing MGU. LPS impairs MGU by both the direct effect of inflammation on the myocyte, as well as by the indirect NO-driven cardiovascular dysfunction.
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10
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Cai J, Lu S, Yao Z, Deng YP, Zhang LD, Yu JW, Ren GF, Shen FM, Jiang GJ. Glibenclamide attenuates myocardial injury by lipopolysaccharides in streptozotocin-induced diabetic mice. Cardiovasc Diabetol 2014; 13:106. [PMID: 25077824 PMCID: PMC4147163 DOI: 10.1186/s12933-014-0106-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Revised: 01/25/2014] [Accepted: 06/22/2014] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Sepsis is a common disease that continues to increase in incidence in the world. Diseases, such as diabetes mellitus, may make the situation worse. Diabetic patients are at increased risk for common infections. This study was designed to investigate the role of glibenclamide on myocardial injury by lipopolysaccharides (LPS) in streptozotocin induced diabetic mice (STZ-mice). METHODS LPS was used to induce endotoxemia in STZ-mice. Heart rate and mean arterial pressure were measured by MPA-HBBS. Serum epinephrine level was measured by enzyme-linked immunosorbent assays (ELISA). Myocardial injury was examined by light and transmission electron microscope and TUNEL staining. Macrophage infiltration was measured by immunohistochemistry. Interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) levels in myocardial tissue and serum in STZ-mice, and in conditional medium of primary cultured peritoneal macrophages were determined by ELISA. Nalp3 and Caspase-1 protein levels were measured by Western blotting analysis. RESULTS STZ administration decreased body weight and increased blood glucose in C57BL/6 mice. LPS injection caused decreases of heart rate and mean arterial pressure, and elevated serum epinephrine level in C57BL/6 mice. Compared with control mice without STZ treatment, LPS induced more severe myocardial injury and macrophage infiltration in STZ-mice, which was attenuated by pretreatment of glibenclamide. LPS stimulation enhanced the levels of IL-1β and TNF-α in both cardiac tissue and serum. Glibenclamide pretreatment significantly inhibited the serum levels of pro-inflammatory cytokines. Either high glucose or LPS increased the levels of IL-1β and TNF-α in the conditional medium of peritoneal macrophages. Glibenclamide treatment suppressed the increase of IL-1β level induced by high glucose and LPS. Furthermore, Nalp3 and Caspase-1 levels were markedly increased by high glucose plus LPS, and both proteins were significantly inhibited by glibenclamide treatment. CONCLUSIONS We conclude that glibenclamide could attenuate myocardial injury induced by LPS challenge in STZ-mice, which was possibly related to inhibiting inflammation through Nalp3 inflammasomes.
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Affiliation(s)
| | | | | | | | | | | | | | - Fu-Ming Shen
- Department of Pharmacy, Zhejiang Xiaoshan Hospital, Hangzhou 311202, Zhejiang, China.
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Du RH, Dai T, Cao WJ, Lu M, Ding JH, Hu G. Kir6.2-containing ATP-sensitive K(+) channel is required for cardioprotection of resveratrol in mice. Cardiovasc Diabetol 2014; 13:35. [PMID: 24498880 PMCID: PMC3916794 DOI: 10.1186/1475-2840-13-35] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 01/21/2014] [Indexed: 01/05/2023] Open
Abstract
Background Resveratrol is a natural compound that affects energy metabolism and is also known to possess an array of cardioprotective effects. However, its overall effects on energy metabolism and the underlying mechanism involved in cardioprotection require further investigation. Herein we hypothesize that ATP-sensitive potassium (K-ATP) channels as molecular sensors of cellular metabolism may mediate the cardioprotective effects of resveratrol. Methods Kir6.2 knockout, Kir6.1 heterozygous and wild-type (WT) mice were subjected to ischemia/reperfusion injury and were injected with resveratrol (10 mg/kg, i.p). Myocardial infarct size, serum lactate dehydrogenase (LDH) and creatine kinase (CK) activities were determined. Neonatal cardiomyocytes were used in in vitro assays to investigate the underlying mechanism of resveratrol in cardioprotection. Results Resveratrol treatment significantly reduced myocardial infarct size and serum LDH and CK activity and inhibited oxygen-glucose deprivation/reoxygenation – induced cardiomyocyte apoptosis in WT and Kir6.1 heterozygous mice, but Kir6.2 deficiency can abolish the cardioprotective effects of resveratrol in vivo and in vitro. We further found that resveratrol enhanced 5′-AMP-activated protein kinase (AMPK) phosphorylation and promoted the association of AMPK with Kir6.2. Suppression of AMPK attenuated and activation of AMPK mimicked the cardioprotective effects of resveratrol in cardiomyocytes. Notably, Kir6.2 knockout also reversed the cardioprotection of AMPK activator. Conclusions Our study demonstrates that resveratrol exerts cardioprotective effects through AMPK -Kir6.2/K-ATP signal pathway and Kir6.2-containing K-ATP channel is required for cardioprotection of resveratrol.
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Affiliation(s)
| | | | | | | | | | - Gang Hu
- Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, P,R, China.
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