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Gurin AE, Gagarinsky EL, Fesenko EE. The Effect of Pressure of Gas Mixtures Containing Carbon Monoxide, Oxygen and Argon on the Shelf Life of Rat Heart Tissues in Hypothermic Conditions. Biophysics (Nagoya-shi) 2021. [DOI: 10.1134/s0006350921050079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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2
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Wang J, Fan K, He C, Wang Q, Zhang Q, Huang W. A novel Danshensu/tetramethylpyrazine protects against Myocardial Ischemia Reperfusion Injury in rats. Int J Med Sci 2021; 18:2716-2724. [PMID: 34104104 PMCID: PMC8176181 DOI: 10.7150/ijms.59411] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 05/04/2021] [Indexed: 12/21/2022] Open
Abstract
A new Danshensu/tetramethylpyrazine derivative (ADTM) with cardio-protection effects such as antioxidant, arterial relaxation, pro-angiogenesis and antiplatelet activities. Platelet activating factor receptor (PAFR) plays a key role in myocardial ischemia reperfusion (MIR) injury. This study aims to investigate the protective role of ADTM in MIR injury and clarify the potential role of PAFR. We measured the effects of ADTM on MIR injury in rats in vivo and hypoxia re-oxygenation (HR) injury in neonatal rat ventricular myocytes (NRVMs) in vitro. The results show that ADTM can significantly improve the IR-induced decline in heart function as increasing EF and FS, and restore the decreased cardiac hemodynamic parameters (LVSP, ± dp/dt max) and increased the level of LVEDP, decrease the infarct size of damaged myocardium and lactate dehydrogenase (LDH) activity in serum. Additionally, ADTM inhibits cardiomyocytes apoptosis, caspase-3 activity, and inflammatory response as well as down-regulates the MIR-induced IL-1β and TNFα production. Next, PAFR expression was significantly down-regulated in cardiomyocytes of MIR model in vivo and in vitro after treated with ADTM compare to IR group. At the same time, ADTM and PAFR small interfering RNA (siRNA) could inhibit cardiomyocytes apoptosis and inflammation during HR, while PAF presents the opposite effect. Furthermore, the above effects of PAF in HR induced cardiomyocytes were reversed by co-treatment of ADTM. Our findings demonstrate for the first time that ADTM protects against MIR injury through inhibition of PAFR signaling, which provides a new treatment for MIR.
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Affiliation(s)
- Jinghao Wang
- Department of Pharmacy, the First Affiliated Hospital, Jinan University, Guangzhou 510630, China
| | - Kai Fan
- Department of Pathophysiology, Harbin Medical University-Daqing, Daqing, 163319, China
| | - Cong He
- Department of Pharmacology, Harbin Medical University-Daqing, Daqing, 163319, China
| | - Qingyang Wang
- Department of Pharmacology, Harbin Medical University-Daqing, Daqing, 163319, China
| | - Qianhui Zhang
- Department of Pharmacology, Harbin Medical University-Daqing, Daqing, 163319, China
| | - Wei Huang
- Department of Pharmacology, Harbin Medical University-Daqing, Daqing, 163319, China
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3
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Yuan X, Juan Z, Zhang R, Sun X, Yan R, Yue F, Huang Y, Yu J, Xia X. Clemastine Fumarate Protects Against Myocardial Ischemia Reperfusion Injury by Activating the TLR4/PI3K/Akt Signaling Pathway. Front Pharmacol 2020; 11:28. [PMID: 32116705 PMCID: PMC7025565 DOI: 10.3389/fphar.2020.00028] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 01/10/2020] [Indexed: 01/22/2023] Open
Abstract
Our pilot studies have shown that clemastine fumarate (CLE) can protect against myocardial ischemia-reperfusion injury (MIRI) through regulation of toll like receptor 4 (TLR4). However, the protective mechanism of CLE and related signaling pathways for MIRI remains unclear. The objective of this study is to determine the mechanism by which CLE relieves MIRI in cardiomyocytes and its relationship with the TLR4/PI3K/Akt signaling pathway. CCK8 analysis was used to test the optimal concentration of TLR4 inhibitor CLI-095 and TLR4 agonist lipopolysaccharide (LPS) on MIRI. The expression of inflammatory factors, oxidative stress response, cell damage, and intracellular calcium redistribution of cardiomyocytes were examined using the ELISA kits, Total Superoxide Dismutase Assay Kit with WST-8 and Lipid Peroxidation MDA Assay Kit, LDH Cytotoxicity Assay Kit, and laser scanning confocal microscope. The expression of TLR4/PI3K/Akt and cleaved caspase-3 were determined by Western blotting and immunofluorescent staining. Our results showed that MIRI aggravated the inflammatory response, oxidative stress, cellular damage of cardiomyocytes, and caused redistribution of intracellular calcium, upregulated the expression of TLR4 protein, cleaved caspase-3 protein, and down-regulated the expression of PI3K/Akt protein. After treatment with CLE, the inflammatory response, oxidative stress, and cellular damage of cardiomyocytes were alleviated, and intracellular calcium ion accumulation decreased. The expression of TLR4 protein, cleaved caspase-3 protein declined, but PI3K/Akt protein expression increased in cardiomyocytes treated with CLE. In addition, after treatment with the TLR4 inhibitor CLI-095, the results were similar to those of CLE treatment. The TLR4 agonist LPS aggravated the reactions caused by MIRI. The role of LPS was reversed after CLE treatment. These results suggested that CLE can attenuate MIRI by activating the TLR4/PI3K/Akt signaling pathway.
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Affiliation(s)
- Xiaoxiao Yuan
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Zhaodong Juan
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Rui Zhang
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Xiaotong Sun
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Ru Yan
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Feng Yue
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Yaru Huang
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Jiacheng Yu
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
| | - Xiaohui Xia
- Shandong Provincial Medicine and Health Key Laboratory of Clinical Anesthesia, Department of Anesthesiology, Weifang Medical University, Weifang, China
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Hasan HF, Radwan RR, Galal SM. Bradykinin‐potentiating factor isolated from
Leiurus quinquestriatus
scorpion venom alleviates cardiomyopathy in irradiated rats
via
remodelling of the RAAS pathway. Clin Exp Pharmacol Physiol 2019; 47:263-273. [DOI: 10.1111/1440-1681.13202] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 10/25/2019] [Accepted: 10/27/2019] [Indexed: 11/29/2022]
Affiliation(s)
- Hesham Farouk Hasan
- Radiation Biology Department National Center for Radiation Research and Technology (NCRRT) Atomic Energy Authority Cairo Egypt
| | - Rasha R. Radwan
- Drug Radiation Research Department National Center for Radiation Research and Technology Atomic Energy Authority Cairo Egypt
| | - Shereen Mohamed Galal
- Health Radiation Research Department National Center for Radiation Research and Technology Atomic Energy Authority Cairo Egypt
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5
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Organ preservation solutions: linking pharmacology to survival for the donor organ pathway. Curr Opin Organ Transplant 2019; 23:361-368. [PMID: 29697461 DOI: 10.1097/mot.0000000000000525] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
PURPOSE OF REVIEW To provide an understanding of the scientific principles, which underpinned the development of organ preservation solutions, and to bring into context new strategies and challenges for solution development against the background of changing preservation technologies and expanded criteria donor access. RECENT FINDINGS Improvements in organ preservation solutions continue to be made with new pharmacological approaches. New solutions have been developed for dynamic perfusion preservation and are now in clinical application. Principles defining organ preservation solution pharmacology are being applied for cold chain logistics in tissue engineering and regenerative medicine. SUMMARY Organ preservation solutions support the donor organ pathway. The solution compositions allow additives and pharmacological agents to be delivered direct to the target organ to mitigate preservation injury. Changing preservation strategies provide further challenges and opportunities to improve organ preservation solutions.
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Yan Q, Li Y, Yan J, Zhao Y, Liu Y, Liu S. Luteolin improves heart preservation through inhibiting hypoxia-dependent L-type calcium channels in cardiomyocytes. Exp Ther Med 2019; 17:2161-2171. [PMID: 30867703 DOI: 10.3892/etm.2019.7214] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 08/09/2018] [Indexed: 12/17/2022] Open
Abstract
The current study aimed to evaluate whether luteolin could improve long-term heart preservation; this was achieved by evaluating the heart following long-term storage in University of Wisconsin solution (the control group) and in solutions containing three luteolin concentrations. The effects of different preservation methods were evaluated with respect to cardiac function while hearts were in custom-made ex vivo Langendorff perfusion systems. Different preservation methods were evaluated with respect to the histology, ultrastructure and apoptosis rate of the hearts, and the function of cardiomyocytes. In the presence of luteolin, the rate pressure product of the left ventricle was increased within 60 min of reperfusion following a 12-h preservation, coronary flow was higher within 30 min of reperfusion, cardiac contractile function was higher throughout reperfusion following 12- and 18-h preservations, and the left ventricle peak systolic pressure was significantly higher compared with the control group (all P<0.05). The expression levels of apoptosis regulator Bax and apoptosis regulator Bcl-2 in the luteolin groups were significantly decreased and increased, respectively. Lactate dehydrogenase, creatine kinase and malondialdehyde enzymatic activity was increased following long-term storage, while the activity of superoxide dismutase was significantly decreased. Furthermore, luteolin inhibited L-type calcium currents in ventricular myocytes under hypoxia conditions. Thus, luteolin demonstrated protective effects during long-term heart preservation in what appeared to be a dose-dependent manner, which may be accomplished through inhibiting hypoxia-dependent L-type calcium channels.
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Affiliation(s)
- Qingfeng Yan
- Department of Pathophysiology, Hainan Medical College, Haikou, Hainan 571199, P.R. China
| | - Yueping Li
- Department of Histology and Embryology, Hainan Medical College, Haikou, Hainan 571199, P.R. China
| | - Jia Yan
- Department of Food and Nutrition, Hainan Tropical Ocean University, Sanya, Hainan 572000, P.R. China
| | - Ying Zhao
- Department of Cardiac Surgery, The First Affiliated Hospital of Hainan Medical College, Haikou, Hainan 570102, P.R. China
| | - Yunzhong Liu
- Department of Cardiac Surgery, The First Affiliated Hospital of Hainan Medical College, Haikou, Hainan 570102, P.R. China
| | - Su Liu
- Department of Cardiac Surgery, The First Affiliated Hospital of Hainan Medical College, Haikou, Hainan 570102, P.R. China
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Chang W, Wu QQ, Xiao Y, Jiang XH, Yuan Y, Zeng XF, Tang QZ. Acacetin protects against cardiac remodeling after myocardial infarction by mediating MAPK and PI3K/Akt signal pathway. J Pharmacol Sci 2017; 135:156-163. [PMID: 29276114 DOI: 10.1016/j.jphs.2017.11.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 10/09/2017] [Accepted: 11/12/2017] [Indexed: 01/18/2023] Open
Abstract
Since inhibiting cardiac remodeling is a critical treatment goal after myocardial infarction (MI), many drugs have been evaluated for this purpose. Acacetin is a flavonoid compound that has been shown to have anti-cancer, anti-mutagenic, anti-inflammatory and anti-peroxidative effects. In this study, we investigated whether acacetin is able to exert a protective effect against MI. One week after anterior wall standard MI surgeries or sham surgeries were performed in mice, acacetin was administered via gavage for two weeks. The results of echocardiographic and hemodynamic evaluation revealed that cardiac dysfunction significantly improved after acacetin treatment. H&E staining indicated that the ratio of the infarct size and the cardiomyocyte cross-sectional area was decreased by acacetin. Masson's staining detected that the fibrotic area ratio was evidently lower in the acacetin-treated MI group. TUNEL assays showed that acacetin ameliorated cardiomyocyte apoptosis after MI. RT-qPCR analysis showed that levels of hypertrophic and fibrotic markers were significantly decreased after acacetin treatment. Western blot analysis of various signaling pathway proteins showed that acacetin targets the MAPK and PI3K/Akt signaling pathways. Collectively, acacetin improves mouse left ventricular function and attenuates cardiac remodeling by inhibiting of the MAPK and PI3K/Akt signaling pathway.
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Affiliation(s)
- Wei Chang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, PR China; Wuhan No.1 Hospital, Wuhan, 430060, PR China
| | - Qing-Qing Wu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, PR China
| | - Yang Xiao
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, PR China
| | - Xiao-Han Jiang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, PR China
| | - Yuan Yuan
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, PR China
| | - Xiao-Feng Zeng
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, PR China
| | - Qi-Zhu Tang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China; Cardiovascular Research Institute, Wuhan University, Wuhan, 430060, PR China; Hubei Key Laboratory of Cardiology, Wuhan, 430060, PR China.
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8
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Zhao X, Xiang Y, Cai C, Zhou A, Zhu N, Zeng C. Schisandrin B protects against myocardial ischemia/reperfusion injury via the PI3K/Akt pathway in rats. Mol Med Rep 2017; 17:556-561. [PMID: 29115607 DOI: 10.3892/mmr.2017.7926] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 09/14/2017] [Indexed: 11/05/2022] Open
Abstract
The natural medicinal monomer, schisandrin B (Sch B), has been shown to exert cardioprotective effects; however, the underlying mechanisms of these effects remain to be fully elucidated. Therefore, the aim of the present study was to investigate whether Sch B attenuated myocardial ischemia/reperfusion (I/R) injury via the phosphoinositide 3‑kinases (PI3K)/Akt signaling pathway. To confirm this, I/R models were established in rats by ligation of the left anterior descending coronary artery. A group of animals were administered with Sch B (60 mg/kg, lavage) and/or the PI3K inhibitor, LY294002 (0.3 mg/kg, intraperitoneal). Myocardial infarct size, myocardial infarct serum markers, myocardial apoptotic index and the expression of Akt were measured in each group. The results demonstrated that the administration of Sch B reduced the size of the myocardial infarct, and this effect was eliminated following LY294002 treatment. In addition, the administration of Sch B decreased the apoptotic index and the serum markers of myocardial infarction. Sch B administration also increased the expression of phosphorylated Akt, and Sch B treatment decreased the B‑cell lymphoma 2 (Bcl‑2)‑like protein 4/Bcl‑2 ratio and the expression of cleaved caspase‑3. Therefore, Sch B may protect myocardial tissue from I/R injury via the PI3K/Akt signaling pathway in rats.
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Affiliation(s)
- Xuyong Zhao
- Department of Cardiology, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui Central Hospital, Lishui, Zhejiang 323000, P.R. China
| | - Yijia Xiang
- Department of Cardiology, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui Central Hospital, Lishui, Zhejiang 323000, P.R. China
| | - Changhong Cai
- Department of Cardiology, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui Central Hospital, Lishui, Zhejiang 323000, P.R. China
| | - Aiming Zhou
- Department of Cardiology, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui Central Hospital, Lishui, Zhejiang 323000, P.R. China
| | - Ning Zhu
- Department of Cardiology, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui Central Hospital, Lishui, Zhejiang 323000, P.R. China
| | - Chunlai Zeng
- Department of Cardiology, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui Central Hospital, Lishui, Zhejiang 323000, P.R. China
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9
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Wang YJ, Yan J, Zou XL, Guo KJ, Zhao Y, Meng CY, Yin F, Guo L. Bone marrow mesenchymal stem cells repair cadmium-induced rat testis injury by inhibiting mitochondrial apoptosis. Chem Biol Interact 2017; 271:39-47. [PMID: 28457857 DOI: 10.1016/j.cbi.2017.04.024] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Revised: 04/24/2017] [Accepted: 04/27/2017] [Indexed: 12/14/2022]
Abstract
Cadmium is a highly toxic metal with widespread exposure to people that can cause tissue injuries that lack effective treatment. The aim of this project was to uncover whether bone marrow mesenchymal stem cells (BMSCs) can repair cadmium-induced rat testis injury and to explore the role of mitochondrial apoptosis in this process. To this end, 21 adult male Wistar rats were randomly divided into control, model and therapy groups, 7 each, and were administered 0, 0.4 and 0.4 mg/kg body weight CdCl2 saline solution, respectively, by intraperitoneal injection 5 times per week for 5 weeks. Then, rats in the therapy group were treated with 107 BMSCs by retro-orbital injections, while the others were given equal volumes of phosphate buffered saline. Following 2-week BMSCs-treatment, the therapy rats were heavier than the model rats, despite there being no difference in testicular cadmium contents between these groups, which were both significantly higher than the control group. BMSCs were observed in the testis of the therapy rats, in which pathological changes improved significantly compared with the model group. Expression of the apoptosis-associated proteins Bim, Bax, Cytochrome C, Caspase-3, active-Caspase-3 and AIF increased, while Bcl-2 was reduced significantly in rat testes of model group compared with the other groups. Based on these findings, we conclude that cadmium can accumulate in rat testes where it caused severe tissue injury, BMSCs can be localized to the injured testicular tissue of rats and repair the tissue injury, these reparative effects may be highly related with mitochondrial apoptosis.
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Affiliation(s)
- Yong-Jie Wang
- Department of Toxicology, School of Public Health, Jilin University, Changchun, China
| | - Jun Yan
- Department of Toxicology, School of Public Health, Jilin University, Changchun, China
| | - Xiao-Li Zou
- Department of Orthopaedics, China-Japan Union Hospital, Jilin University, Changchun, China
| | - Ke-Jun Guo
- Department of Toxicology, School of Public Health, Jilin University, Changchun, China
| | - Yue Zhao
- Department of Toxicology, School of Public Health, Jilin University, Changchun, China
| | - Chun-Yang Meng
- Department of Orthopaedics, China-Japan Union Hospital, Jilin University, Changchun, China
| | - Fei Yin
- Department of Orthopaedics, China-Japan Union Hospital, Jilin University, Changchun, China
| | - Li Guo
- Department of Toxicology, School of Public Health, Jilin University, Changchun, China.
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10
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Abstract
Carbon monoxide (CO) has long been considered an environmental pollutant and a poison. Exogenous exposure to amounts of CO beyond the physiologic level of the body can result in a protective or adaptive response. However, as a gasotransmitter, endogenous CO is important for multiple physiologic functions. To date, at least seven distinct methods of delivering CO have been utilized in animal and clinical studies. In this mini-review, we summarize the exogenous CO delivery methods and compare their advantages and disadvantages.
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Affiliation(s)
- Hui-Jun Hu
- Department of Navy Aeromedicine, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China; Department of Hyperbaric Oxygen, Navy General Hospital, Beijing, China
| | - Qiang Sun
- Department of Hyperbaric Oxygen, Navy General Hospital, Beijing, China
| | - Zhou-Heng Ye
- Department of Navy Aeromedicine, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
| | - Xue-Jun Sun
- Department of Navy Aeromedicine, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
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11
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Cheng XY, Gu XY, Gao Q, Zong QF, Li XH, Zhang Y. Effects of dexmedetomidine postconditioning on myocardial ischemia and the role of the PI3K/Akt-dependent signaling pathway in reperfusion injury. Mol Med Rep 2016; 14:797-803. [PMID: 27221008 PMCID: PMC4918562 DOI: 10.3892/mmr.2016.5345] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Accepted: 05/13/2016] [Indexed: 11/18/2022] Open
Abstract
The present study aimed to determine whether post-ischemic treatment with dexmedetomidine (DEX) protected the heart against acute myocardial ischemia/reperfusion (I/R)-induced injury in rats. The phosphatidylinositol-3 kinase/protein kinase B(PI3K/Akt)-dependent signaling pathway was also investigated. Male Sprague Dawley rats (n=64) were subjected to ligation of the left anterior descending artery (LAD), which produced ischemia for 25 min, followed by reperfusion. Following LAD ligation, rats were treated with DEX (5, 10 and 20 µg/kg) or underwent post-ischemic conditioning, which included three cycles of ischemic insult. In order to determine the role of the PI3K/Akt signaling pathway, wortmannin (Wort), a PI3K inhibitor, was used to treat a group of rats that had also been treated with DEX (20 µg/kg). Post-reperfusion, lactate dehydrogenase (LDH), cardiac troponin I (cTnI), creatine kinase isoenzymes (CK-MB), superoxide dismutase (SOD) and malondialdehyde (MDA) serum levels were measured using an ultraviolet spectrophotometer. The protein expression levels of phosphorylated (p)-Akt, Ser9-p-glycogen synthase kinase-3β (p-GSK-3β) and cleaved caspase-3 were detected in heart tissue by western blotting. The mRNA expression levels of B-cell lymphoma 2 (Bcl-2) and Bcl-2-associated X protein (Bax) were detected using reverse transcription-polymerase chain reaction. At the end of the experiment, the hearts were removed and perfused in an isolated perfusion heart apparatus with Evans blue (1%) in order to determine the non-ischemic areas. The risk and infarct areas of the heart were not dyed. As expected, I/R induced myocardial infarction, as determined by the increased serum levels of cTnI, CK-MB and MDA, and the decreased levels of SOD. Post-ischemic treatment with DEX increased the expression levels of p-Akt and p-GSK-3β, whereas caspase-3 expression was reduced following DEX treatment compared with in the I/R group. Compared with the I/R group, the ratio of Bcl-2/Bax at the mRNA level was elevated in the DEX and ischemic post-conditioning groups, whereas the expression levels of Bax were decreased. Conversely, the effects of DEX were attenuated by Wort. These results indicated that, similar to post-ischemic conditioning, post-ischemic treatment with DEX protects the heart against I/R via the PI3K/Akt-dependent signaling pathway, possibly by activating GSK-3β.
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Affiliation(s)
- Xiang Yang Cheng
- Department of Anesthesiology, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230601, P.R. China
| | - Xiao Yu Gu
- Department of Anesthesiology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Qin Gao
- Department of Physiology, Bengbu Medical College, Bengbu, Anhui 233030, P.R. China
| | - Qiao Feng Zong
- Department of Physiology, Bengbu Medical College, Bengbu, Anhui 233030, P.R. China
| | - Xiao Hong Li
- Department of Anesthesiology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui 233004, P.R. China
| | - Ye Zhang
- Department of Anesthesiology, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230601, P.R. China
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