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Hu T, Lu MN, Chen B, Tong J, Mao R, Li SS, Dai P, Tan YX, Xiyang YB. Electro-acupuncture-induced neuroprotection is associated with activation of the IGF-1/PI3K/Akt pathway following adjacent dorsal root ganglionectomies in rats. Int J Mol Med 2018; 43:807-820. [PMID: 30569108 PMCID: PMC6317683 DOI: 10.3892/ijmm.2018.4035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 12/17/2018] [Indexed: 12/22/2022] Open
Abstract
The aim of the present study was to investigate the putative role and underlying mechanisms of insulin-like growth factor 1 (IGF-1) in mediating neuroplasticity in rats subjected to partial dorsal root ganglionectomies following electro-acupuncture (EA) treatment. The rats underwent bilateral removal of the L1-L4 and L6 dorsal root ganglia (DRG), sparing the L5 DRG, and were subsequently subjected to 28 days of EA treatment at two paired acupoints, zusanli (ST 36)-xuanzhong (GB 39) and futu (ST 32)-sanyinjiao (SP 6), as the EA Model group. Rats that received partial dorsal root ganglionectomies without EA treatment served as a control (Model group). Subsequently, herpes simplex virus (HSV)-IGF-1, HSV-small interfering (si) RNA-IGF-1 and the associated control vectors were injected into the L5 DRG of rats in the EA Model group. HSV-IGF-1 transfection enhanced EA-induced neuroplasticity, which manifested as partial recovery in locomotor function, remission hyperpathia, growth of DRG-derived spared fibers, increased expression of phosphorylated (p-) phosphatidylinositol 3-kinase (PI3K) and Akt, and increased pPI3K/PI3K and pAkt/Akt expression ratios. By contrast, HSV-siRNA-IGF-1 treatment attenuated these effects induced by HSV-IGF-1 transfection. The results additionally demonstrated that HSV-IGF-1 transfection augmented the outgrowth of neurites in cultured DRG neurons, and interference of the expression of IGF-1 retarded neurite outgrowth. Co-treatment with a PI3K inhibitor or Akt siRNA inhibited the aforementioned effects induced by the overexpression of IGF-1. In conclusion, the results of the present study demonstrated the crucial roles of IGF-1 in EA-induced neuroplasticity following adjacent dorsal root ganglionectomies in rats via the PI3K/Akt signaling pathway.
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Affiliation(s)
- Tao Hu
- Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Min-Nan Lu
- Experiment Center for Medical Science Research, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Bo Chen
- Experiment Center for Medical Science Research, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Jun Tong
- Physical Education Department, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Rui Mao
- School of Stomatology, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Shan-Shan Li
- Basic Medical College, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Pin Dai
- Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Ya-Xin Tan
- Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
| | - Yan-Bin Xiyang
- Institute of Neuroscience, Kunming Medical University, Kunming, Yunnan 650500, P.R. China
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The Possible Roles of Biological Bone Constructed with Peripheral Blood Derived EPCs and BMSCs in Osteogenesis and Angiogenesis. BIOMED RESEARCH INTERNATIONAL 2016; 2016:8168943. [PMID: 27195296 PMCID: PMC4852345 DOI: 10.1155/2016/8168943] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/07/2016] [Accepted: 03/21/2016] [Indexed: 02/07/2023]
Abstract
This study aimed to determine the possible potential of partially deproteinized biologic bone (PDPBB) seeded with bone marrow stromal cells (BMSCs) and endothelial progenitor cells (EPCs) in osteogenesis and angiogenesis. BMSCs and EPCs were isolated, identified, and cocultured in vitro, followed by seeding on the PDPBB. Expression of osteogenesis and vascularization markers was quantified by immunofluorescence (IF) staining, immunohistochemistry (IHC), and quantitive real-time polymerase chain reaction (qRT-PCR). Scanning electron microscope (SEM) was also employed to further evaluate the morphologic alterations of cocultured cells in the biologic bone. Results demonstrated that the coculture system combined with BMSCs and EPCs had significant advantages of (i) upregulating the mRNA expression of VEGF, Osteonectin, Osteopontin, and Collagen Type I and (ii) increasing ALP and OC staining compared to the BMSCs or EPCs only group. Moreover, IHC staining for CD105, CD34, and ZO-1 increased significantly in the implanted PDPBB seeded with coculture system, compared to that of BMSCs or EPCs only, respectively. Summarily, the present data provided evidence that PDPBB seeded with cocultured system possessed favorable cytocompatibility, provided suitable circumstances for different cell growth, and had the potential to provide reconstruction for cases with bone defection by promoting osteogenesis and angiogenesis.
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Liu W, Shang FF, Xu Y, Belegu V, Xia L, Zhao W, Liu R, Wang W, Liu J, Li CY, Wang TH. eIF5A1/RhoGDIα pathway: a novel therapeutic target for treatment of spinal cord injury identified by a proteomics approach. Sci Rep 2015; 5:16911. [PMID: 26593060 PMCID: PMC4655360 DOI: 10.1038/srep16911] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 10/22/2015] [Indexed: 02/05/2023] Open
Abstract
Spinal cord injury (SCI) is frequently accompanied by a degree of spontaneous functional recovery. The underlying mechanisms through which such recovery is generated remain elusive. In this study, we observed a significant spontaneous motor function recovery 14 to 28 days after spinal cord transection (SCT) in rats. Using a comparative proteomics approach, caudal to the injury, we detected difference in 20 proteins. Two of these proteins, are eukaryotic translation initiation factor 5A1 (eIF5A1) that is involved in cell survival and proliferation, and Rho GDP dissociation inhibitor alpha (RhoGDIα), a member of Rho GDI family that is involved in cytoskeletal reorganization. After confirming the changes in expression levels of these two proteins following SCT, we showed that in vivo eIF5A1 up-regulation and down-regulation significantly increased and decreased, respectively, motor function recovery. In vitro, eIF5A1 overexpression in primary neurons increased cell survival and elongated neurite length while eIF5A1 knockdown reversed these results. We found that RhoGDIα up-regulation and down-regulation rescues the effect of eIF5A1 down-regulation and up-regulation both in vivo and in vitro. Therefore, we have identified eIF5A1/RhoGDIα pathway as a new therapeutic target for treatment of spinal cord injured patients.
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Affiliation(s)
- Wei Liu
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Fei-Fei Shang
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Yang Xu
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Visar Belegu
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Lei Xia
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Wei Zhao
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Ran Liu
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Wei Wang
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Jin Liu
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
| | - Chen-Yun Li
- Key Laboratory of Agro-Biodiversity and Pest Management of Education Ministry of China, Yunnan Agricultural University, Kunming, 650000, P.R. China
| | - Ting-Hua Wang
- Institute of Neurological Disease, The state key laboratory of Biotherapy, Department of Anesthesiology and Translational Neuroscience Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 61041, P.R. China
- Institute of Neuroscience, Kunming medical University, Kunming 650031, P.R. China
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4
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Li L, Yang M, Wang C, Zhao Q, Liu J, Zhan C, Liu Z, Li X, Wang W, Yang X. Effects of cytokines and chemokines on migration of mesenchymal stem cells following spinal cord injury. Neural Regen Res 2015; 7:1106-12. [PMID: 25722702 PMCID: PMC4340025 DOI: 10.3969/j.issn.1673-5374.2012.14.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 03/20/2012] [Indexed: 01/16/2023] Open
Abstract
We investigated the effects of cytokines and chemokines and their associated signaling pathways on mesenchymal stem cell migration after spinal cord injury, to determine their roles in the curative effects of mesenchymal stem cells. This study reviewed the effects of tumor necrosis factor-α, vascular endothelial growth factor, hepatocyte growth factor, platelet-derived growth factor, basic fibroblast growth factor, insulin like growth factor-1, stromal cell-derived factor and monocyte chemoattractant protein-1, 3 during mesenchymal stem cell migration to damaged sites, and analyzed the signal transduction pathways involved in their effects on mesenchymal stem cell migration. The results confirmed that phosphatidylinositol 3-kinase/serine/threonine protein kinases and nuclear factor-κB play crucial roles in the migration of mesenchymal stem cells induced by cytokines and chemokines.
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Affiliation(s)
- Longyun Li
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Maoguang Yang
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Chunxin Wang
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Qiheng Zhao
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Jian Liu
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Chuanguo Zhan
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Zhi Liu
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Xuepeng Li
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Weihua Wang
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
| | - Xiaoyu Yang
- Department of Orthopedics, China-Japan Friendship Hospital, Jilin University, Changchun 130033, Jilin Province, China
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5
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XiYang YB, Wang YC, Zhao Y, Ru J, Lu BT, Zhang YN, Wang NC, Hu WY, Liu J, Yang JW, Wang ZJ, Hao CG, Feng ZT, Xiao ZC, Dong W, Quan XZ, Zhang LF, Wang TH. Sodium Channel Voltage-Gated Beta 2 Plays a Vital Role in Brain Aging Associated with Synaptic Plasticity and Expression of COX5A and FGF-2. Mol Neurobiol 2015; 53:955-967. [PMID: 25575679 DOI: 10.1007/s12035-014-9048-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Accepted: 12/02/2014] [Indexed: 02/05/2023]
Abstract
The role of sodium channel voltage-gated beta 2 (SCN2B) in brain aging is largely unknown. The present study was therefore designed to determine the role of SCN2B in brain aging by using the senescence-accelerated mice prone 8 (SAMP8), a brain senescence-accelerated animal model, together with the SCN2B transgenic mice. The results showed that SAMP8 exhibited impaired learning and memory functions, assessed by the Morris water maze test, as early as 8 months of age. The messenger RNA (mRNA) and protein expressions of SCN2B were also upregulated in the prefrontal cortex at this age. Treatment with traditional Chinese anti-aging medicine Xueshuangtong (Panax notoginseng saponins, PNS) significantly reversed the SCN2B expressions in the prefrontal cortex, resulting in improved learning and memory. Moreover, SCN2B knockdown transgenic mice were generated and bred to determine the roles of SCN2B in brain senescence. A reduction in the SCN2B level by 60.68% resulted in improvement in the hippocampus-dependent spatial recognition memory and long-term potential (LTP) slope of field excitatory postsynaptic potential (fEPSP), followed by an upregulation of COX5A mRNA levels and downregulation of fibroblast growth factor-2 (FGF-2) mRNA expression. Together, the present findings indicated that SCN2B could play an important role in the aging-related cognitive deterioration, which is associated with the regulations of COX5A and FGF-2. These findings could provide the potential strategy of candidate target to develop antisenescence drugs for the treatment of brain aging.
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Affiliation(s)
- Yan-Bin XiYang
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China.,Institute of Neurological Disease, State Key Lab of Biotherapy, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, China
| | - You-Cui Wang
- Institute of Neurological Disease, State Key Lab of Biotherapy, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, China
| | - Ya Zhao
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China
| | - Jin Ru
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China
| | - Bing-Tuan Lu
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China.,Institute of Neurological Disease, State Key Lab of Biotherapy, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, China
| | - Yue-Ning Zhang
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China
| | - Nai-Chao Wang
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China
| | - Wei-Yan Hu
- Institute of Molecular and Clinical Medicine, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China.,Monash Immunology and Stem Cell Laboratories (MISCL), Monash University, Clayton, VIC, Australia
| | - Jia Liu
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China.,Institute of Neurological Disease, State Key Lab of Biotherapy, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, China
| | - Jin-Wei Yang
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China
| | - Zhao-Jun Wang
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China
| | - Chun-Guang Hao
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China
| | - Zhong-Tang Feng
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China.,Institute of Neurological Disease, State Key Lab of Biotherapy, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, China
| | - Zhi-Cheng Xiao
- Institute of Molecular and Clinical Medicine, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China.,Monash Immunology and Stem Cell Laboratories (MISCL), Monash University, Clayton, VIC, Australia
| | - Wei Dong
- Key Laboratory of Human Diseases Comparative Medicine, Ministry of Health, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS), 100021, Beijing, China.,Comparative Medicine Centre, Peking Union Medical College (PUMC), 100021, Beijing, China
| | - Xiong-Zhi Quan
- Key Laboratory of Human Diseases Comparative Medicine, Ministry of Health, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS), 100021, Beijing, China.,Comparative Medicine Centre, Peking Union Medical College (PUMC), 100021, Beijing, China
| | - Lian-Feng Zhang
- Key Laboratory of Human Diseases Comparative Medicine, Ministry of Health, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS), 100021, Beijing, China. .,Comparative Medicine Centre, Peking Union Medical College (PUMC), 100021, Beijing, China.
| | - Ting-Hua Wang
- Institute of Neuroscience, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan, China. .,Institute of Neurological Disease, State Key Lab of Biotherapy, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu, China.
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6
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Shang FF, Zhao W, Zhao Q, Liu J, Li DW, Zhang H, Zhou XF, Li CY, Wang TH. Upregulation of eIF-5A1 in the paralyzed muscle after spinal cord transection associates with spontaneous hindlimb locomotor recovery in rats by upregulation of the ErbB, MAPK and neurotrophin signal pathways. J Proteomics 2013; 91:188-99. [PMID: 23238062 DOI: 10.1016/j.jprot.2012.12.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 11/18/2012] [Accepted: 12/02/2012] [Indexed: 02/05/2023]
Abstract
It is well known that trauma is frequently accompanied by spontaneous functional recovery after spinal cord injury (SCI), but the underlying mechanisms remain elusive. In this study, BBB scores showed a gradual return of locomotor functions after SCT. Proteomics analysis revealed 16 differential protein spots in the gastrocnemius muscle between SCT and normal rats. Of these differential proteins, eukaryotic translation initiation factor 5A1 (elf-5A1), a highly conserved molecule throughout eukaryotes, exhibited marked upregulation in the gastrocnemius muscle after SCT. To study the role of eIF-5A1 in the restoration of hindlimb locomotor functions following SCT, we used siRNA to downregulate the mRNA level of eIF-5A1. Compared with untreated SCT control rats, those subjected to eIF-5A1 knockdown exhibited impaired functional recovery. Moreover, gene expression microarrays and bioinformatic analysis showed high correlation between three main signal pathways (ErbB, MAPK and neurotrophin signal pathways) and eIF-5A1. These signal pathways regulate cell proliferation, differentiation and neurocyte growth. Consequently, eIF-5A1 played a pivotal role via these signal pathways in hindlimb locomotor functional recovery after SCT, which could pave the way for the development of a new strategy for the treatment of spinal cord injury in clinical trials.
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Affiliation(s)
- Fei-Fei Shang
- Institute of Neurological Disease, The State Key Laboratory of Biotherapy and Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu 610041, PR China
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7
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Zhao YJ, Wang H, Liu X, Sun M, Kazuhiro H. Protective effects of glutamine in a rat model of endotoxemia. Mol Med Rep 2012; 6:739-44. [PMID: 22842774 DOI: 10.3892/mmr.2012.1007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 07/20/2012] [Indexed: 11/05/2022] Open
Abstract
The aim of this study was to characterize the protective effects of glutamine (Gln) on brain cells undergoing experimental endotoxemia induced by lipopolysaccharide (LPS) injection. Young rats were injected with LPS or control, and a subset of LPS-injected rats were pretreated with Gln. Electron microscopy and immunohistochemistry were used to visualize apoptosis and to determine distribution and expression of nuclear factor-κB (NF-κB), heat shock protein 70 (HSP70), platelet-derived growth factor-B (PDGF-B) and PDGF receptor-β (PDGFR-β). The levels of HSP70, PDGF-B and PDGFR-β in the rat brain were comparatively analyzed by western blotting. In a rat brain model of endotoxemia, Gln decreases the magnitude of apoptosis, upregulates the expression of HSP70 and inhibits the translocation of NF-κB from the cytoplasm to the nucleus. Gln upregulates PDGF-B and PDGFR-β expression in early and advanced sepsis. PDGF-B and PDGFR-β upregulation in the cerebral cortex are likely neuroprotective effects of Gln. We found that Gln is capable of regulating the immunological defense of local brain tissue, which provides a theoretical basis for using Gln to prevent and treat encephalopathy.
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Affiliation(s)
- Ya-Juan Zhao
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, PR China.
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8
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Rong R, Meng BL, Jiang N, Hu LQ, Wang TH. Roles of BDNF in spinal neuroplasticity in cats subjected to partial dorsal ganglionectomy. Growth Factors 2011; 29:263-70. [PMID: 21854347 DOI: 10.3109/08977194.2011.606786] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study investigated the role of brain-derived neurotrophic factor (BDNF) in neuroplasticity in cats subjected to the removal of dorsal root ganglia (DRG). Following partial ganglionectomy, the number of BDNF-positive varicosities from spared L6 DRG decreased significantly. This reduction was observed at 3 days post operation (dpo) in spinal lamina II of L3 and L5. Whereas the percentages of positive neurons for BDNF and its mRNA in spared L6 DRG at 10 dpo were significantly increased, and accumulated BDNF was seen on the DRG side of the ligated axons. Importantly, BDNF antibody neutralization in vivo results in a significant reduction in the number of varicosities in spinal lamina II, evidenced by BDNF and calcitonin gene-related peptide immunohistochemical staining. These findings suggested that peripheral-derived BDNF could play a critical role in spinal neuroplasticity in cats subjected to partial ganglionectomy. This may underlie the basis of molecular therapy depending on gene drug-like BDNF release.
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Affiliation(s)
- Rong Rong
- Cadre's Ward, Anhui Provincial Hospital , Hefei, P.R. China
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9
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Lutton C, Young YW, Williams R, Meedeniya ACB, Mackay-Sim A, Goss B. Combined VEGF and PDGF treatment reduces secondary degeneration after spinal cord injury. J Neurotrauma 2011; 29:957-70. [PMID: 21568693 DOI: 10.1089/neu.2010.1423] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Trauma to the spinal cord creates an initial physical injury damaging neurons, glia, and blood vessels, which then induces a prolonged inflammatory response, leading to secondary degeneration of spinal cord tissue, and further loss of neurons and glia surrounding the initial site of injury. Angiogenesis is a critical step in tissue repair, but in the injured spinal cord angiogenesis fails; blood vessels formed initially later regress. Stabilizing the angiogenic response is therefore a potential target to improve recovery after spinal cord injury (SCI). Vascular endothelial growth factor (VEGF) can initiate angiogenesis, but cannot sustain blood vessel maturation. Platelet-derived growth factor (PDGF) can promote blood vessel stability and maturation. We therefore investigated a combined application of VEGF and PDGF as treatment for traumatic spinal cord injury, with the aim to reduce secondary degeneration by promotion of angiogenesis. Immediately after hemisection of the spinal cord in the rat we delivered VEGF and PDGF and to the injury site. One and 3 months later the size of the lesion was significantly smaller in the treated group compared to controls, and there was significantly reduced gliosis surrounding the lesion. There was no significant effect of the treatment on blood vessel density, although there was a significant reduction in the numbers of macrophages/microglia surrounding the lesion, and a shift in the distribution of morphological and immunological phenotypes of these inflammatory cells. VEGF and PDGF delivered singly exacerbated secondary degeneration, increasing the size of the lesion cavity. These results demonstrate a novel therapeutic intervention for SCI, and reveal an unanticipated synergy for these growth factors whereby they modulated inflammatory processes and created a microenvironment conducive to axon preservation/sprouting.
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Affiliation(s)
- Cameron Lutton
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia.
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10
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Guízar-Sahagún G, Grijalva I, Hernández-Godínez B, Franco-Bourland RE, Cruz-Antonio L, Martínez-Cruz A, Ibáñez-Contreras A, Madrazo I. New approach for graded compression spinal cord injuries in Rhesus macaque: method feasibility and preliminary observations. J Med Primatol 2011; 40:401-13. [PMID: 21732951 DOI: 10.1111/j.1600-0684.2011.00483.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Current models of spinal cord injury (SCI) have been ineffective for translational research. Primate blunt SCI, which more closely resembles human injury, could be a promising model to fill this gap. METHODS Graded compression SCI was produced by inflating at T9 an epidural balloon as a function of spinal canal dimensions in a non-uniform group of monkeys. RESULTS Sham injury and cord compression by canal invasion of 50-75% produced minimal morpho-functional alterations, if at all. Canal invasion of 90-100% resulted in proportional functional deficits. Unexpectedly, these animals showed spontaneous gradual recovery over a 12-week period achieving quadruped walking, although with persistent absence of foot grasping reflex. Histopathology revealed predominance of central cord damage that correlated with functional status. CONCLUSIONS Our preliminary results suggest that this model could potentially be a useful addition to translational work, but requires further validation by including animals with permanent injuries and expansion of replicates.
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Affiliation(s)
- Gabriel Guízar-Sahagún
- Research Unit for Neurological Diseases, Instituto Mexicano del Seguro Social, Mexico City, Mexico.
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11
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Rocha de Paula M, Gómez Ravetti M, Berretta R, Moscato P. Differences in abundances of cell-signalling proteins in blood reveal novel biomarkers for early detection of clinical Alzheimer's disease. PLoS One 2011; 6:e17481. [PMID: 21479255 PMCID: PMC3063784 DOI: 10.1371/journal.pone.0017481] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2010] [Accepted: 02/06/2011] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND In November 2007 a study published in Nature Medicine proposed a simple test based on the abundance of 18 proteins in blood to predict the onset of clinical symptoms of Alzheimer's Disease (AD) two to six years before these symptoms manifest. Later, another study, published in PLoS ONE, showed that only five proteins (IL-1, IL-3, EGF, TNF- and G-CSF) have overall better prediction accuracy. These classifiers are based on the abundance of 120 proteins. Such values were standardised by a Z-score transformation, which means that their values are relative to the average of all others. METHODOLOGY The original datasets from the Nature Medicine paper are further studied using methods from combinatorial optimisation and Information Theory. We expand the original dataset by also including all pair-wise differences of z-score values of the original dataset ("metafeatures"). Using an exact algorithm to solve the resulting Feature Set problem, used to tackle the feature selection problem, we found signatures that contain either only features, metafeatures or both, and evaluated their predictive performance on the independent test set. CONCLUSIONS It was possible to show that a specific pattern of cell signalling imbalance in blood plasma has valuable information to distinguish between NDC and AD samples. The obtained signatures were able to predict AD in patients that already had a Mild Cognitive Impairment (MCI) with up to 84% of sensitivity, while maintaining also a strong prediction accuracy of 90% on a independent dataset with Non Demented Controls (NDC) and AD samples. The novel biomarkers uncovered with this method now confirms ANG-2, IL-11, PDGF-BB, CCL15/MIP-1; and supports the joint measurement of other signalling proteins not previously discussed: GM-CSF, NT-3, IGFBP-2 and VEGF-B.
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Affiliation(s)
- Mateus Rocha de Paula
- Centre for Bioinformatics, Biomarker Discovery & Information-Based Medicine, The University of Newcastle, Callaghan, Australia
| | - Martín Gómez Ravetti
- Departamento de Engenharia de Produção, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Regina Berretta
- Centre for Bioinformatics, Biomarker Discovery & Information-Based Medicine, The University of Newcastle, Callaghan, Australia
| | - Pablo Moscato
- Centre for Bioinformatics, Biomarker Discovery & Information-Based Medicine, The University of Newcastle, Callaghan, Australia
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