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Jia J, Xia J, Liu W, Tao F, Xiao J. Cinnamtannin B-1 Inhibits the Progression of Osteosarcoma by Regulating the miR-1281/PPIF Axis. Biol Pharm Bull 2023; 46:67-73. [PMID: 36273900 DOI: 10.1248/bpb.b22-00600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Osteosarcoma (OS), one of the bone tumors, occurs mainly during childhood and adolescence and has an incidence rate of 5%. Cinnamtannin B-1 (CTB-1) is a natural trimeric proanthocyanidin compound found in plants Cinnamomum zeylanicum and Laurus nobilis. Previously, several articles have demonstrated that CTB-1 exerts a certain effect on melanoma and cervical cancer. However, their role in OS remains unclear. In this study, CTB-1 was found to inhibit the proliferation of OS cancer cells, with the dose of CTB-1 positively correlated to the survival rate of HOS and MG-63 cells. Recently, microRNAs (miRNAs) were also reported to play an important role in tumor proliferation. Hence, we performed the miRNA sequencing analysis after CTB-1 treatment to identify miRNA levels in HOS cells and found that the expression of miR-1281 was significantly upregulated. According to the functional analysis, CTB-1 inhibited the growth and migration of OS by upregulating the expression of miR-1281. Additionally, miR-1281 acted as a sponge for Peptidylprolyl Isomerase F (PPIF), inhibiting its expression levels. The rescue experiments revealed that CTB-1 delayed the development of OS by regulating the miR-1281/PPIF pathway. Hence, our findings suggested that CTB-1 inhibited the cell growth, invasion, and migration of OS by upregulating miR-1281 and inhibiting PPIF expression, thereby providing a possible target drug for OS treatment.
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Affiliation(s)
- Jun Jia
- Department of Orthopaedics, The 904th Hospital of Joint Logistic Support Force, PLA
| | - Jiaojiao Xia
- Department of Periodontology, Suzhou Stomatological Hospital
| | - Weifeng Liu
- Department of Orthopaedics, The 904th Hospital of Joint Logistic Support Force, PLA
| | - Fengqin Tao
- Department of Orthopaedics, The 904th Hospital of Joint Logistic Support Force, PLA
| | - Jun Xiao
- Department of Orthopaedics, The 904th Hospital of Joint Logistic Support Force, PLA
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2
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Alejo‐Armijo A, Ortega‐Vidal J, Salido S, Altarejos J. Recovery and Seasonal Variation of Cinnamtannin B‐1 from Laurel (
Laurus nobilis
L.) Pruning Wood Wastes. Chem Biodivers 2022; 19:e202100807. [DOI: 10.1002/cbdv.202100807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 12/27/2021] [Indexed: 11/06/2022]
Affiliation(s)
- Alfonso Alejo‐Armijo
- Departamento de Química Inorgánica y Orgánica Facultad de Ciencias Experimentales Universidad de Jaén Campus de Excelencia Internacional Agroalimentario (ceiA3) 23071 Jaén Spain
| | - Juan Ortega‐Vidal
- Departamento de Química Inorgánica y Orgánica Facultad de Ciencias Experimentales Universidad de Jaén Campus de Excelencia Internacional Agroalimentario (ceiA3) 23071 Jaén Spain
| | - Sofía Salido
- Departamento de Química Inorgánica y Orgánica Facultad de Ciencias Experimentales Universidad de Jaén Campus de Excelencia Internacional Agroalimentario (ceiA3) 23071 Jaén Spain
| | - Joaquín Altarejos
- Departamento de Química Inorgánica y Orgánica Facultad de Ciencias Experimentales Universidad de Jaén Campus de Excelencia Internacional Agroalimentario (ceiA3) 23071 Jaén Spain
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3
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Qi K, Yang Y, Geng Y, Cui H, Li X, Jin C, Chen G, Tian X, Meng X. Tongxinluo attenuates oxygen-glucose-serum deprivation/restoration-induced endothelial barrier breakdown via peroxisome proliferator activated receptor-α/angiopoietin-like 4 pathway in high glucose-incubated human cardiac microvascular endothelial cells. Medicine (Baltimore) 2020; 99:e21821. [PMID: 32846824 PMCID: PMC7447398 DOI: 10.1097/md.0000000000021821] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Traditional Chinese medicine Tongxinluo (TXL) has been widely used to treat coronary artery disease in China, since it could reduce myocardial infarct size and ischemia/reperfusion injury in both non-diabetic and diabetic conditions. It has been shown that TXL could regulate peroxisome proliferator activated receptor-α (PPAR-α), a positive modulator of angiopoietin-like 4 (Angptl4), in diabetic rats. Endothelial junction substructure components, such as VE-cadherin, are involved in the protection of reperfusion injury. Thus, we hypothesized cell-intrinsic and endothelial-specific Angptl4 mediated the protection of TXL on endothelial barrier under high glucose condition against ischemia/reperfusion-injury via PPAR-α pathway. METHODS Incubated with high glucose medium, the human cardiac microvascular endothelial cells (HCMECs) were then exposed to oxygen-glucose-serum deprivation (2 hours) and restoration (2 hours) stimulation, with or without TXL, insulin, or rhAngptl4 pretreatment. RESULTS TXL, insulin, and rhAngptl4 had similar protective effects on the endothelial barrier. TXL treatment reversed the endothelial barrier breakdown in HCMECs significantly as identified by decreasing endothelial permeability, upregulating the expression of JAM-A, VE-cadherin, and integrin-α5 and increasing the membrane location of VE-cadherin and integrin-α5, and these effects of TXL were as effective as insulin and rhAngptl4. However, Angptl4 knock-down with small interfering RNA (siRNA) interference and PPAR-α inhibitor MK886 partially abrogated these beneficial effects of TXL. Western blotting also revealed that similar with insulin, TXL upregulated the expression of Angptl4 in HCMECs, which could be inhibited by Angptl4 siRNA or MK886 exposure. TXL treatment increased PPAR-α activity, which could be diminished by MK886 but not by Angptl4 siRNA. CONCLUSION These data suggest cell-intrinsic and endothelial-specific Angptl4 mediates the protection of TXL against endothelial barrier breakdown during oxygen-glucose-serum deprivation and restoration under high glucose condition partly via the PPAR-α/Angptl4 pathway.
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Affiliation(s)
- Kang Qi
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yuejin Yang
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yongjian Geng
- Department of Internal Medicine, Division of Cardiology, The University of Texas Health Science Center at Houston, Houston, TX
| | - Hehe Cui
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiangdong Li
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Chen Jin
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Guihao Chen
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiaqiu Tian
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xianmin Meng
- Department of Cardiology, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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4
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Maeda A. Recruitment of Mesenchymal Stem Cells to Damaged Sites by Plant-Derived Components. Front Cell Dev Biol 2020; 8:437. [PMID: 32582713 PMCID: PMC7295908 DOI: 10.3389/fcell.2020.00437] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 05/11/2020] [Indexed: 12/22/2022] Open
Abstract
Mesenchymal stem cells (MSCs) are capable of differentiating into a limited number of diverse cells and secrete regenerative factors that contribute to the repair of damaged tissue. In response to signals emitted by tissue damage, MSCs migrate from the bone marrow and area surrounding blood vessels within tissues into the circulating blood, and accumulate at the site of damage. Hence, MSC transplantation therapy is beginning to be applied to the treatment of various intractable human diseases. Recent medicinal plants studies have shown that plant-derived components can activate cell functions. For example, several plant-derived components activate cell signaling pathways, such as phosphatidylinositol 3-kinase and mitogen-activated protein kinase (MAPK), enhance expression of the CXCL12/CXCR4 axis, stimulate extracellular matrix remodeling, and consequently, promote cell migration of MSCs. Moreover, plant-derived components have been shown to promote recruitment of MSCs to damaged tissues and enhance healing in disease models, potentially advancing their therapeutic use. This article provides a comprehensive review of several plant-derived components that activate MSC migration and homing to damaged sites to promote tissue repair.
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Affiliation(s)
- Akito Maeda
- Skin Regeneration, PIAS Collaborative Research, Graduate School of Pharmaceutical Science, Osaka University, Suita, Japan
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5
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Xia X, Niu H, Ma Y, Qu B, He M, Yu K, Wang E, Zhang L, Gu J, Liu G. LncRNA CCAT1 Protects Astrocytes Against OGD/R-Induced Damage by Targeting the miR-218/NFAT5-Signaling Axis. Cell Mol Neurobiol 2020; 40:1383-1393. [PMID: 32239388 DOI: 10.1007/s10571-020-00824-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 03/02/2020] [Indexed: 12/19/2022]
Abstract
Spinal cord injury (SCI) is a grievous neurology-related disorder that causes many devastating symptoms. Emerging roles of long non-coding RNAs (lncRNA) have been shown to play critical roles in multiple neurological diseases. This research planned to dig the function and latent molecular mechanisms of the lncRNA CCAT1 on OGD/R-disposed injury in astrocytes. We observed that CCAT1 expression was diminished and miR-218 expression was elevated in astrocytes during OGD/R. Additionally, an abundance of CCAT1 obviously amplified cell viability and restrained OGD/R-triggered apoptosis in astrocytes, as characterized by reduced levels of pro-apoptotic proteins Bax and C-caspase-3, concomitant with elevated level of anti-apoptotic Bcl-2 protein. Furthermore, administration of CCAT1 remarkably mitigated OGD/R injury-induced neuro-inflammatory responses, reflected in a reduction of inflammatory cytokines including TNF-α, IL-1β, and IL-6. In action, CCAT1 served as an endogenous sponge effectively downregulating miR-218 expression by binding directly to it, and a negative regulatory relationship between miR-218 and NFAT5. Mechanistically, introduction of miR-218 reversed the inhibitory effects of CCAT1 on OGD/R-induced apoptosis and inflammation damage, which directly resulted from the inhibition of miR-218 and its targeting of NFAT5. Collectively, our study illuminated a new CCAT1/miR-218/NFAT5 regulatory axis in which CCAT1 served as a competing endogenous RNA by sponging miR-218, effectively upregulating NFAT5 expression, thereby alleviating apoptosis and inflammation damage under OGD/R condition. CCAT1 is, therefore, a putative therapeutic target for SCI, based on the results of this study and the potential application of CCAT1 as a neuroprotective agent.
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Affiliation(s)
- Xun Xia
- Department of Neurosurgery, The First Affiliated Hospital of Chengdu Medical College, NO. 278 Baoguang Avenue Middle Section, Xindu District, Chengdu, 610500, Sichuan, People's Republic of China
| | - Hao Niu
- Sichuan Institute of Computer Science, Chengdu, 610041, Sichuan, People's Republic of China
| | - Yuan Ma
- Department of Neurosurgery, General Hospital of Western Theater Command, Chengdu, 610083, Sichuan, People's Republic of China
| | - Bo Qu
- Department of Orthopedics, The First Affiliated Hospital of Chengdu Medical College, Chengdu, 610500, Sichuan, People's Republic of China
| | - Mingjie He
- Department of Neurosurgery, The First Affiliated Hospital of Chengdu Medical College, NO. 278 Baoguang Avenue Middle Section, Xindu District, Chengdu, 610500, Sichuan, People's Republic of China
| | - Kai Yu
- Department of Neurosurgery, The First Affiliated Hospital of Chengdu Medical College, NO. 278 Baoguang Avenue Middle Section, Xindu District, Chengdu, 610500, Sichuan, People's Republic of China
| | - Enren Wang
- Department of Neurosurgery, The First Affiliated Hospital of Chengdu Medical College, NO. 278 Baoguang Avenue Middle Section, Xindu District, Chengdu, 610500, Sichuan, People's Republic of China
| | - Lie Zhang
- Department of Neurosurgery, The First Affiliated Hospital of Chengdu Medical College, NO. 278 Baoguang Avenue Middle Section, Xindu District, Chengdu, 610500, Sichuan, People's Republic of China
| | - Jianwen Gu
- Department of Neurosurgery, PLA Strategic Support Force Specialty Medical Center, NO.9 Anxiangbeili, Chaoyang District, Beijing, 100101, People's Republic of China.
| | - Gang Liu
- Department of Neurosurgery, The First Affiliated Hospital of Chengdu Medical College, NO. 278 Baoguang Avenue Middle Section, Xindu District, Chengdu, 610500, Sichuan, People's Republic of China
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6
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Sánchez-Rubio F, Fernández-Santos MR, Castro-Vázquez L, García-Álvarez O, Maroto-Morales A, Soler AJ, Martínez-Pastor F, Garde JJ. Cinnamtannin B-1, a novel antioxidant for sperm in red deer. Anim Reprod Sci 2018; 195:44-52. [PMID: 29776697 DOI: 10.1016/j.anireprosci.2018.05.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 04/19/2018] [Accepted: 05/03/2018] [Indexed: 01/14/2023]
Abstract
Cinnamtannin B-1 (CNB-1) is a naturally occurring trimeric A-type proanthocyanidin contained in several plants such as cinnamon (Cinnamomum zeylanicum). It is considered to be a potent antioxidant. The protective effect of CNB-1 against oxidative stress was assessed in red deer epididymal sperm incubated at 37 °C. Cryopreserved sperm from six stags were thawed, pooled and extended to 400 × 106 sperm/ml in BGM (bovine gamete medium). After being aliquoted, the samples were supplemented with different concentrations of CNB-1 (0, 0.1, 1, 10 and 100 μg/mL), with or without induced oxidative stress (100 μM Fe2+/ascorbate). The samples were evaluated after 0, 2 and 4 h of incubation at 37 °C. This experiment was replicated six times. Spermmotility (CASA), viability, mitochondrial membrane potential, acrosomal status, lipoperoxidation (C11 BODIPY 581/591), intracellular reactive oxygen species (ROS) production and DNA status (TUNEL) were assessed. After 4 h of incubation, CNB-1 prevented the deleterious effects of oxidative stress, thus improved sperm progressivity and velocity (P<0.05). Furthermore, 1 and 10 μM CNB-1 improved sperm linearity, even when compared to those samples that had not been subjected to oxidative stress (P<0.05). The greatest concentration, 100 μM, prevented sperm lipoperoxidation and reduced ROS production in samples subjected to oxidative stress.
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Affiliation(s)
- F Sánchez-Rubio
- SaBio IREC (CSIC - UCLM - JCCM), Albacete, Spain; Servicio de Farmacia. Complejo Hospitalario Universitario de Albacete. GAI. Albacete, Spain
| | - M R Fernández-Santos
- SaBio IREC (CSIC - UCLM - JCCM), Albacete, Spain; Faculty of Pharmacy (UCLM), Albacete, Spain.
| | | | - O García-Álvarez
- Biomedical Center, Medical Faculty in Pilsen, Pilsen, Czech Republic
| | | | - A J Soler
- SaBio IREC (CSIC - UCLM - JCCM), Albacete, Spain
| | - F Martínez-Pastor
- Department of Molecular Biology (Cell Biology) and Institute for Animal Health and Cattle Development (INDEGSAL), University of León, León, Spain
| | - J J Garde
- SaBio IREC (CSIC - UCLM - JCCM), Albacete, Spain
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7
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Tetrandrine protects against oxygen-glucose-serum deprivation/reoxygenation-induced injury via PI3K/AKT/NF-κB signaling pathway in rat spinal cord astrocytes. Biomed Pharmacother 2016; 84:925-930. [DOI: 10.1016/j.biopha.2016.10.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 09/20/2016] [Accepted: 10/01/2016] [Indexed: 12/25/2022] Open
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8
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Xia X, Qu B, Li YM, Yang LB, Fan KX, Zheng H, Huang HD, Gu JW, Kuang YQ, Ma Y. NFAT5 protects astrocytes against oxygen-glucose-serum deprivation/restoration damage via the SIRT1/Nrf2 pathway. J Mol Neurosci 2016; 61:96-104. [PMID: 27838821 DOI: 10.1007/s12031-016-0849-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Accepted: 09/22/2016] [Indexed: 01/05/2023]
Abstract
Nuclear factor of activated T cells (NFAT) is a multifunctional cytokine family. NFAT5 was recently reported to be involved in many neuronal functions, but its specific function remains unclear. In this study, our aim is to investigate whether NFAT5 overexpression can protect astrocytes against oxygen-glucose-serum deprivation/restoration (OGSD/R) damage. In vivo, rats were subjected to ischemia-reperfusion injury, resulting in increased water content, infarct volume, and expression of NFAT5 protein in rat spinal cord. After primary culture for spinal cord astrocytes, the in vitro OGSD/R model was established. The results of the CCK8 assay and flow cytometry showed that, in the OGSD/R group, astrocyte cell viability was downregulated, but astrocyte apoptosis increased. Caspase 3 activity increased as well. Levels of NFAT5, as detected by real-time quantitative PCR and western blot, decreased under OGSD/R, as did SIRT1. Commercial kits for activity assays were used to show that OGSD/R inhibited SIRT1 activation but accelerated SOD activation after OGSD/R. Next, pcDNA-NFAT5 or NFAT5 siRNA was transfected into astrocytes. Overexpression of NFAT5 not only promoted the survival of the astrocytes and SIRT1 activation under OGSD/R but also inhibited cell apoptosis and SOD activation. Moreover, overexpression of NFAT5 apparently diminished histone acetylation and promoted the nuclear transport of Nrf2. Our results show that NFAT5 protects spinal astrocytes in a manner that depends on activation of the SIRT1/Nrf2 pathway. These findings present a novel potential molecular mechanism for NFAT5 therapy in the context of spinal cord injury.
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Affiliation(s)
- Xun Xia
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China
| | - Bo Qu
- Department of Orthopaedics, Chengdu Military General Hospital, Chengdu, 610083, China
| | - Yun-Ming Li
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China
| | - Li-Bin Yang
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China
| | - Ke-Xia Fan
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China
| | - Hui Zheng
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China
| | - Hai-Dong Huang
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China
| | - Jian-Wen Gu
- Department of Neurological Surgery, The 306th Hospital of PLA, No. 9 Anxiangbeili, Chaoyang District, Beijing, 100101, China.
| | - Yong-Qin Kuang
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China.
| | - Yuan Ma
- Department of Neurological Surgery, Chengdu Military General Hospital, Chengdu, 610083, China.
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9
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Impact of Heat Shock Protein A 12B Overexpression on Spinal Astrocyte Survival Against Oxygen-Glucose-Serum Deprivation/Restoration in Primary Cultured Astrocytes. J Mol Neurosci 2016; 59:511-20. [PMID: 27179807 DOI: 10.1007/s12031-016-0768-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 12/21/2015] [Indexed: 12/12/2022]
Abstract
Heat shock protein A 12B (HSPA12B) is a newly discovered member of the heat shock protein 70 family. Preclinical evidence indicates that HSPA12B helps protect the brain from ischemic injury, although its specific function remains unclear. The aim of this study is to investigate whether HSPA12B overexpression can protect astrocytes from oxygen-glucose-serum deprivation/restoration (OGD/R) injury. We analyzed the effects of HSPA12B overexpression on spinal cord ischemia-reperfusion injury and spinal astrocyte survival. After ischemia-reperfusion injury, we found that HSPA12B overexpression decreased spinal cord water content and infarct volume. MTT assay showed that HSPA12B overexpression increased astrocyte survival after OGD/R treatment. Flow cytometry results showed a marked inhibition of OGD/R-induced astrocyte apoptosis. Western blot assay showed that HSPA12B overexpression significantly increased regulatory protein B-cell lymphocyte 2 (Bcl-2) levels, whereas it decreased expression of the Bax protein, which forms a heterodimer with Bcl-2. Measurements of the level of activation of caspase-3 by Caspase-Glo®3/7 Assay kit showed that HSPA12B overexpression markedly inhibited caspase-3 activation. Notably, we demonstrated that the effects of HSPA12B on spinal astrocyte survival depended on activation of the PI3K/Akt signal pathway. These findings indicate that HSPA12B protects against spinal cord ischemia-reperfusion injury and may represent a potential treatment target.
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10
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DRAM1 protects neuroblastoma cells from oxygen-glucose deprivation/reperfusion-induced injury via autophagy. Int J Mol Sci 2014; 15:19253-64. [PMID: 25342320 PMCID: PMC4227272 DOI: 10.3390/ijms151019253] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 09/18/2014] [Accepted: 10/09/2014] [Indexed: 01/01/2023] Open
Abstract
DNA damage-regulated autophagy modulator protein 1 (DRAM1), a multi-pass membrane lysosomal protein, is reportedly a tumor protein p53 (TP53) target gene involved in autophagy. During cerebral ischemia/reperfusion (I/R) injury, DRAM1 protein expression is increased, and autophagy is activated. However, the functional significance of DRAM1 and the relationship between DRAM1 and autophagy in brain I/R remains uncertain. The aim of this study is to investigate whether DRAM1 mediates autophagy activation in cerebral I/R injury and to explore its possible effects and mechanisms. We adopt the oxygen-glucose deprivation and reperfusion (OGD/R) Neuro-2a cell model to mimic cerebral I/R conditions in vitro, and RNA interference is used to knock down DRAM1 expression in this model. Cell viability assay is performed using the LIVE/DEAD viability/cytotoxicity kit. Cell phenotypic changes are analyzed through Western blot assays. Autophagy flux is monitored through the tandem red fluorescent protein-Green fluorescent protein-microtubule associated protein 1 light chain 3 (RFP-GFP-LC3) construct. The expression levels of DRAM1 and microtubule associated protein 1 light chain 3II/I (LC3II/I) are strongly up-regulated in Neuro-2a cells after OGD/R treatment and peaked at the 12 h reperfusion time point. The autophagy-specific inhibitor 3-Methyladenine (3-MA) inhibits the expression of DRAM1 and LC3II/I and exacerbates OGD/R-induced cell injury. Furthermore, DRAM1 knockdown aggravates OGD/R-induced cell injury and significantly blocks autophagy through decreasing autophagosome-lysosome fusion. In conclusion, our data demonstrate that DRAM1 knockdown in Neuro-2a cells inhibits autophagy by blocking autophagosome-lysosome fusion and exacerbated OGD/R-induced cell injury. Thus, DRAM1 might constitute a new therapeutic target for I/R diseases.
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11
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Liu T, Xue CC, Shi YL, Bai XJ, Li ZF, Yi CL. Overexpression of mitofusin 2 inhibits reactive astrogliosis proliferation in vitro. Neurosci Lett 2014; 579:24-9. [PMID: 25017825 DOI: 10.1016/j.neulet.2014.07.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 06/14/2014] [Accepted: 07/01/2014] [Indexed: 10/25/2022]
Abstract
Astrocytes become activated in response to central nervous system (CNS) injury, and excessive astrogliosis is considered an impediment to axonal regeneration by forming glial scar. Mitofusin 2 (Mfn2), a key protein in mitochondrial network, has been reported to negatively regulate cell proliferation. The present study aimed to explore whether reactive astrogliosis could be suppressed by Mfn2 overexpression. Scratch injury and starvation-serum stimulation models in cultured astrocytes were combined to address this issue. In scratch model, reactive proliferation status of damaged astrocytes was implicated by migration of high ratio of EdU(+) cells into lesion region and significantly increased expression of GFAP and PCNA. At meantime, Mfn2 expression was found to exert a down-regulated trend both in gen and protein levels. Pretreatment of cells with adenoviral vector encoding Mfn2 gene increased Mfn2 expression and subsequently attenuated injury-induced astrocytes hyperplasia, activation-relevant protein synthesis, cellular proliferation, eventually delayed wound healing process. Furthermore, Mfn2 overexpression markedly inhibited astrocytes proliferation induced by serum stimulation, by arresting the transition of cell cycle from G1 to S phase. Together, these in vitro results demonstrated that reactive astrogliosis can be effectively suppressed by up-regulation of Mfn2, which might contribute to a promising therapeutic intervention in CNS disease characterized by glia-related damage.
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Affiliation(s)
- Tao Liu
- Department of Traumatic Surgery, Tong-ji Hospital, Tong-ji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chen-chen Xue
- Department of Traumatic Surgery, Tong-ji Hospital, Tong-ji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu-long Shi
- Department of Traumatic Surgery, Tong-ji Hospital, Tong-ji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiang-jun Bai
- Department of Traumatic Surgery, Tong-ji Hospital, Tong-ji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhan-fei Li
- Department of Traumatic Surgery, Tong-ji Hospital, Tong-ji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Cheng-la Yi
- Department of Traumatic Surgery, Tong-ji Hospital, Tong-ji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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