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Shang Z, Shi W, Fu H, Zhang Y, Yu T. Identification of key autophagy-related genes and pathways in spinal cord injury. Sci Rep 2024; 14:6553. [PMID: 38504116 PMCID: PMC10951339 DOI: 10.1038/s41598-024-56683-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Accepted: 03/09/2024] [Indexed: 03/21/2024] Open
Abstract
Spinal cord injury (SCI) can cause a range of functional impairments, and patients with SCI have limited potential for functional recovery. Previous studies have demonstrated that autophagy plays a role in the pathological process of SCI, but the specific mechanism of autophagy in this context remains unclear. Therefore, we explored the role of autophagy in SCI by identifying key autophagy-related genes and pathways. This study utilized the GSE132242 expression profile dataset, which consists of four control samples and four SCI samples; autophagy-related genes were sourced from GeneCards. R software was used to screen differentially expressed genes (DEGs) in the GSE132242 dataset, which were then intersected with autophagy-related genes to identify autophagy-related DEGs in SCI. Subsequently, the expression levels of these genes were confirmed and analyzed with gene ontology (GO) and the Kyoto Encyclopedia of Genes and Genomes (KEGG). A protein-protein interaction (PPI) analysis was conducted to identify interaction genes, and the resulting network was visualized with Cytoscape. The MCODE plug-in was used to build gene cluster modules, and the cytoHubba plug-in was applied to screen for hub genes. Finally, the GSE5296 dataset was used to verify the reliability of the hub genes. We screened 129 autophagy-related DEGs, including 126 up-regulated and 3 down-regulated genes. GO and KEGG pathway enrichment analysis showed that these 129 genes were mainly involved in the process of cell apoptosis, angiogenesis, IL-1 production, and inflammatory reactions, the TNF signaling pathway and the p53 signaling pathway. PPI identified 10 hub genes, including CCL2, TGFB1, PTGS2, FN1, HGF, MYC, IGF1, CD44, CXCR4, and SERPINEL1. The GSE5296 dataset revealed that the control group exhibited lower expression levels than the SCI group, although only CD44 and TGFB1 showed significant differences. This study identified 129 autophagy-related genes that might play a role in SCI. CD44 and TGFB1 were identified as potentially important genes in the autophagy process after SCI. These findings provide new targets for future research and offer new perspectives on the pathogenesis of SCI.
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Affiliation(s)
- Zhen Shang
- Medical Department of Qingdao University, Qingdao, 266000, China
| | - Weipeng Shi
- Medical Department of Qingdao University, Qingdao, 266000, China
| | - Haitao Fu
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, 266000, Shandong, China
| | - Yingze Zhang
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, 266000, Shandong, China.
- Shandong Institute of Traumatic Orthopedics, Qingdao, 266000, China.
| | - Tengbo Yu
- Department of Orthopedic Surgery, Qingdao Municipal Hospital, Qingdao, 266000, China.
- Institute of Sports Medicine and Health, Qingdao University, Qingdao, 266000, China.
- Department of Orthopedic Surgery, Qingdao Hospital, University of Health and Rehabilitation Sciences, Qingdao, 266000, China.
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2
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Li K, Liu Z, Wu P, Chen S, Wang M, Liu W, Zhang L, Guo S, Liu Y, Liu P, Zhang B, Tao L, Ding H, Qian H, Fu Q. Micro electrical fields induced MSC-sEVs attenuate neuronal cell apoptosis by activating autophagy via lncRNA MALAT1/miR-22-3p/SIRT1/AMPK axis in spinal cord injury. J Nanobiotechnology 2023; 21:451. [PMID: 38012570 PMCID: PMC10680254 DOI: 10.1186/s12951-023-02217-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 11/17/2023] [Indexed: 11/29/2023] Open
Abstract
Spinal cord injury (SCI) is a traumatic condition of the central nervous system that causes paralysis of the limbs. Micro electric fields (EF) have been implicated in a novel therapeutic approach for nerve injury repair and regeneration, but the effects of human umbilical cord mesenchymal stem cell-derived small extracellular vesicles that are induced by micro electric fields (EF-sEVs) stimulation on SCI remain unknown. The aim of the present study was to investigate whether EF-sEVs have therapeutic effects a rat model of SCI. EF-sEVs and normally conditioned human umbilical cord mesenchymal stem cells-derived small extracellular vesicles (CON-sEVs) were collected and injected intralesionally into SCI model rats to evaluate the therapeutic effects. We detect the expression of candidate long noncoding RNA metastasis-associated lung adenocarcinoma transcript 1 (lncRNA-MALAT1) in EF-sEVs and CON-sEVs. The targets and downstream effectors of lncRNA-MALAT1 were investigated using luciferase reporter assays. Using both in vivo and in vitro experiments, we demonstrated that EF-sEVs increased autophagy and decreased apoptosis after SCI, which promoted the recovery of motor function. We further confirmed that the neuroprotective effects of EF-sEVs in vitro and in vivo correlated with the presence of encapsulated lncRNA-MALAT1 in sEVs. lncRNA-MALAT1 targeted miR-22-3p via sponging, reducing miR-22-3p's suppressive effects on its target, SIRT1, and this translated into AMPK phosphorylation and increased levels of the antiapoptotic protein Bcl-2. Collectively, the present study identified that the lncRNA-MALAT1 in EF-sEVs plays a neuroprotective role via the miRNA-22-3p/SIRT1/AMPK axis and offers a fresh perspective and a potential therapeutic approach using sEVs to improve SCI.
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Affiliation(s)
- Kewei Li
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China
| | - Zhong Liu
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China
| | - Peipei Wu
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
- Department of Laboratory Medicine, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Shenyuan Chen
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Min Wang
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Wenhui Liu
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Leilei Zhang
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | - Song Guo
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China
| | - Yanbin Liu
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China
| | - Pengcheng Liu
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China
| | - Beiting Zhang
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China
| | - Lin Tao
- Department of Orthopaedics, Dehong Hospital of Traditional Chinese Medicine, Dehong, 678400, Yunnan, China
| | - Hua Ding
- Department of Orthopaedics, Affiliated People's Hospital of Jiangsu University, Zhenjiang, 212002, Jiangsu, China.
| | - Hui Qian
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
| | - Qiang Fu
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200080, China.
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3
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Baltin M, Smirnova V, Khamatnurova R, Sabirova D, Samigullin B, Sachenkov O, Baltina T. Functional State of the Motor Centers of the Lumbar Spine after Contusion (Th8-Th9) with Application of Methylprednisolone-Copolymer at the Site of Injury. Biomedicines 2023; 11:2026. [PMID: 37509665 PMCID: PMC10377350 DOI: 10.3390/biomedicines11072026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/06/2023] [Accepted: 07/10/2023] [Indexed: 07/30/2023] Open
Abstract
Spinal cord injuries must be treated as soon as possible. Studies of NASCIS protocols have questioned the use of methylprednisolone therapy. This study aimed to evaluate the effect of local delivery of methylprednisolone succinate in combination with a tri-block copolymer in rats with spinal cord injury. The experiments were conducted in accordance with the bioethical guidelines. We evaluated the state of the motor centers below the level of injury by assessing the amplitude of evoked motor responses in the hind limb muscles of rats during epidural stimulation. Kinematic analysis was performed to examine the stepping cycle in each rat. Trajectories of foot movements were plotted to determine the range of limb motion, maximum foot lift height, and lateral deviation of the foot in rats on the 21st day after spinal cord injury. We have shown that the local application of methylprednisolone succinate in combination with block copolymer leads to recovery of center excitability by 21 days after injury. In rats, they recovered weight-supported locomotion, directional control of walking, and balance. The proposed assessment method provides valuable information on gait disturbances following injury and can be utilized to evaluate the quality of therapeutic interventions.
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Affiliation(s)
- Maxim Baltin
- Research Laboratory "Mechanobiology", Institute of Fundamental Medicine and Biology, Kazan Federal University, 420015 Kazan, Russia
- Research Institute of Sports Reserve Training Technologies, Volga State University of Physical Culture, Sports and Tourism, Universiade Village, 35, 420010 Kazan, Russia
| | - Victoriya Smirnova
- N.I. Lobachevsky Institute of Mathematics and Mechanics, Kazan Federal University, 420008 Kazan, Russia
| | - Regina Khamatnurova
- Interdisciplinary Neuroscience Faculty, Goethe-Universität Frankfurt am Main, 60323 Frankfurt am Main, Germany
| | - Diana Sabirova
- N.I. Lobachevsky Institute of Mathematics and Mechanics, Kazan Federal University, 420008 Kazan, Russia
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, 76 K. Marx St., 420015 Kazan, Russia
| | - Bulat Samigullin
- Research Laboratory "Mechanobiology", Institute of Fundamental Medicine and Biology, Kazan Federal University, 420015 Kazan, Russia
- NeuroStart Medical Center, 420049 Kazan, Russia
| | - Oskar Sachenkov
- N.I. Lobachevsky Institute of Mathematics and Mechanics, Kazan Federal University, 420008 Kazan, Russia
- Department Machines Science and Engineering Graphics, Tupolev Kazan National Research Technical University, 420111 Kazan, Russia
| | - Tatyana Baltina
- Research Laboratory "Mechanobiology", Institute of Fundamental Medicine and Biology, Kazan Federal University, 420015 Kazan, Russia
- Department of Human and Animal Physiology, Institute of Fundamental Medicine and Biology, Kazan Federal University, 76 K. Marx St., 420015 Kazan, Russia
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All-Trans Retinoic Acid-Preconditioned Mesenchymal Stem Cells Improve Motor Function and Alleviate Tissue Damage After Spinal Cord Injury by Inhibition of HMGB1/NF-κB/NLRP3 Pathway Through Autophagy Activation. J Mol Neurosci 2022; 72:947-962. [PMID: 35147911 DOI: 10.1007/s12031-022-01977-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 01/20/2022] [Indexed: 12/19/2022]
Abstract
Spinal cord injury (SCI) is a significant public health issue that imposes numerous burdens on patients and society. Uncontrolled excessive inflammation in the second pathological phase of SCI can aggravate the injury. In this paper, we hypothesized that suppressing inflammatory pathways via autophagy could aid functional recovery, and prevent spinal cord tissue degeneration following SCI. To this end, we examined the effects of intrathecal injection of all-trans retinoic acid (ATRA)-preconditioned bone marrow mesenchymal stem cells (BM-MSCs) (ATRA-MSCs) on autophagy activity and the HMGB1/NF-κB/NLRP3 inflammatory pathway in an SCI rat model. This study demonstrated that SCI increased the expression of Beclin-1 (an autophagy-related gene) and NLRP3 inflammasome components such as NLRP3, ASC, Caspase-1, and pro-inflammatory cytokines IL-1β, IL-18, IL-6, and TNF-α. Additionally, following SCI, the protein levels of key autophagy factors (Beclin-1 and LC3-II) and HMGB1/NF-κB/NLRP3 pathway factors (HMGB1, p-NF-κB, NLRP3, IL-1β, and TNF-α) increased. Our findings indicated that ATRA-MSCs enhanced Beclin-1 and LC3-II levels, regulated the HMGB1/NF-κB/NLRP3 pathway, and inhibited pro-inflammatory cytokines. These factors improved hind limb motor activity and aided in the survival of neurons. Furthermore, ATRA-MSCs demonstrated greater beneficial effects than MSCs in treating spinal cord injury. Overall, ATRA-MSC treatment revealed beneficial effects on the damaged spinal cord by suppressing excessive inflammation and activating autophagy. Further research and investigation of the pathways involved in SCI and the use of amplified stem cells may be beneficial for future clinical use.
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Liao HY, Wang ZQ, Ran R, Zhou KS, Ma CW, Zhang HH. Biological Functions and Therapeutic Potential of Autophagy in Spinal Cord Injury. Front Cell Dev Biol 2022; 9:761273. [PMID: 34988074 PMCID: PMC8721099 DOI: 10.3389/fcell.2021.761273] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 11/24/2021] [Indexed: 12/12/2022] Open
Abstract
Autophagy is an evolutionarily conserved lysosomal degradation pathway that maintains metabolism and homeostasis by eliminating protein aggregates and damaged organelles. Many studies have reported that autophagy plays an important role in spinal cord injury (SCI). However, the spatiotemporal patterns of autophagy activation after traumatic SCI are contradictory. Most studies show that the activation of autophagy and inhibition of apoptosis have neuroprotective effects on traumatic SCI. However, reports demonstrate that autophagy is strongly associated with distal neuronal death and the impaired functional recovery following traumatic SCI. This article introduces SCI pathophysiology, the physiology and mechanism of autophagy, and our current review on its role in traumatic SCI. We also discuss the interaction between autophagy and apoptosis and the therapeutic effect of activating or inhibiting autophagy in promoting functional recovery. Thus, we aim to provide a theoretical basis for the biological therapy of SCI.
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Affiliation(s)
- Hai-Yang Liao
- Lanzhou University Second Hospital, Lanzhou, China.,Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, China
| | - Zhi-Qiang Wang
- Lanzhou University Second Hospital, Lanzhou, China.,Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, China
| | - Rui Ran
- Lanzhou University Second Hospital, Lanzhou, China.,Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, China
| | - Kai-Sheng Zhou
- Lanzhou University Second Hospital, Lanzhou, China.,Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, China
| | - Chun-Wei Ma
- Lanzhou University Second Hospital, Lanzhou, China.,Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, China
| | - Hai-Hong Zhang
- Lanzhou University Second Hospital, Lanzhou, China.,Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, China
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Vargova I, Machova Urdzikova L, Karova K, Smejkalova B, Sursal T, Cimermanova V, Turnovcova K, Gandhi CD, Jhanwar-Uniyal M, Jendelova P. Involvement of mTOR Pathways in Recovery from Spinal Cord Injury by Modulation of Autophagy and Immune Response. Biomedicines 2021; 9:biomedicines9060593. [PMID: 34073791 PMCID: PMC8225190 DOI: 10.3390/biomedicines9060593] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 05/17/2021] [Accepted: 05/20/2021] [Indexed: 12/14/2022] Open
Abstract
Traumatic spinal cord injury (SCI) is untreatable and remains the leading cause of disability. Neuroprotection and recovery after SCI can be partially achieved by rapamycin (RAPA) treatment, an inhibitor of mTORC1, complex 1 of the mammalian target of rapamycin (mTOR) pathway. However, mechanisms regulated by the mTOR pathway are not only controlled by mTORC1, but also by a second mTOR complex (mTORC2). Second-generation inhibitor, pp242, inhibits both mTORC1 and mtORC2, which led us to explore its therapeutic potential after SCI and compare it to RAPA treatment. In a rat balloon-compression model of SCI, the effect of daily RAPA (5 mg/kg; IP) and pp242 (5 mg/kg; IP) treatment on inflammatory responses and autophagy was observed. We demonstrated inhibition of the mTOR pathway after SCI through analysis of p-S6, p-Akt, and p-4E-BP1 levels. Several proinflammatory cytokines were elevated in pp242-treated rats, while RAPA treatment led to a decrease in proinflammatory cytokines. Both RAPA and pp242 treatments caused an upregulation of LC3B and led to improved functional and structural recovery in acute SCI compared to the controls, however, a greater axonal sprouting was seen following RAPA treatment. These results suggest that dual mTOR inhibition by pp242 after SCI induces distinct mechanisms and leads to recovery somewhat inferior to that following RAPA treatment.
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Affiliation(s)
- Ingrid Vargova
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Videnska, 1083, 142 20 Prague, Czech Republic; (I.V.); (L.M.U.); (K.K.); (B.S.); (V.C.); (K.T.)
- 2nd Faculty of Medicine, Charles University, V Uvalu 84, 150 06 Prague, Czech Republic
| | - Lucia Machova Urdzikova
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Videnska, 1083, 142 20 Prague, Czech Republic; (I.V.); (L.M.U.); (K.K.); (B.S.); (V.C.); (K.T.)
| | - Kristyna Karova
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Videnska, 1083, 142 20 Prague, Czech Republic; (I.V.); (L.M.U.); (K.K.); (B.S.); (V.C.); (K.T.)
| | - Barbora Smejkalova
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Videnska, 1083, 142 20 Prague, Czech Republic; (I.V.); (L.M.U.); (K.K.); (B.S.); (V.C.); (K.T.)
- 2nd Faculty of Medicine, Charles University, V Uvalu 84, 150 06 Prague, Czech Republic
| | - Tolga Sursal
- Department of Neurosurgery, Westchester Medical Center, New York Medical College, Valhalla, NY 10595, USA; (T.S.); (C.D.G.)
| | - Veronika Cimermanova
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Videnska, 1083, 142 20 Prague, Czech Republic; (I.V.); (L.M.U.); (K.K.); (B.S.); (V.C.); (K.T.)
| | - Karolina Turnovcova
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Videnska, 1083, 142 20 Prague, Czech Republic; (I.V.); (L.M.U.); (K.K.); (B.S.); (V.C.); (K.T.)
| | - Chirag D. Gandhi
- Department of Neurosurgery, Westchester Medical Center, New York Medical College, Valhalla, NY 10595, USA; (T.S.); (C.D.G.)
| | - Meena Jhanwar-Uniyal
- Department of Neurosurgery, Westchester Medical Center, New York Medical College, Valhalla, NY 10595, USA; (T.S.); (C.D.G.)
- Correspondence: (M.J.-U.); (P.J.); Tel.: +420-2-4106-2828 (P.J.)
| | - Pavla Jendelova
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Videnska, 1083, 142 20 Prague, Czech Republic; (I.V.); (L.M.U.); (K.K.); (B.S.); (V.C.); (K.T.)
- 2nd Faculty of Medicine, Charles University, V Uvalu 84, 150 06 Prague, Czech Republic
- Correspondence: (M.J.-U.); (P.J.); Tel.: +420-2-4106-2828 (P.J.)
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Zhu S, Ying Y, Ye J, Chen M, Wu Q, Dou H, Ni W, Xu H, Xu J. AAV2-mediated and hypoxia response element-directed expression of bFGF in neural stem cells showed therapeutic effects on spinal cord injury in rats. Cell Death Dis 2021; 12:274. [PMID: 33723238 PMCID: PMC7960741 DOI: 10.1038/s41419-021-03546-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 12/12/2022]
Abstract
Neural stem cell (NSCs) transplantation has been one of the hot topics in the repair of spinal cord injury (SCI). Fibroblast growth factor (FGF) is considered a promising nerve injury therapy after SCI. However, owing to a hostile hypoxia condition in SCI, there remains a challenging issue in implementing these tactics to repair SCI. In this report, we used adeno-associated virus 2 (AAV2), a prototype AAV used in clinical trials for human neuron disorders, basic FGF (bFGF) gene under the regulation of hypoxia response element (HRE) was constructed and transduced into NSCs to yield AAV2-5HRE-bFGF-NSCs. Our results showed that its treatment yielded temporally increased expression of bFGF in SCI, and improved scores of functional recovery after SCI compared to vehicle control (AAV2-5HRE-NSCs) based on the analyses of the inclined plane test, Basso-Beattie-Bresnahan (BBB) scale and footprint analysis. Mechanistic studies showed that AAV2-5HRE-bFGF-NSCs treatment increased the expression of neuron-specific neuronal nuclei protein (NeuN), neuromodulin GAP43, and neurofilament protein NF200 while decreased the expression of glial fibrillary acidic protein (GFAP) as compared to the control group. Further, the expressions of autophagy-associated proteins LC3-II and Beclin 1 were decreased, whereas the expression of P62 protein was increased in AAV2-5HRE-bFGF-NSCs treatment group. Taken together, our data indicate that AAV2-5HRE-bFGF-NSCs treatment improved the recovery of SCI rats, which is accompanied by evidence of nerve regeneration, and inhibition of SCI-induced glial scar formation and cell autophagy. Thus, this study represents a step forward towards the potential use of AAV2-5HRE-bFGF-NSCs for future clinical trials of SCI repair.
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Affiliation(s)
- Sipin Zhu
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China.
- The Second School of Medicine, Wenzhou Medical University, 325027, Wenzhou, China.
- School of Biomedical Sciences, The University of Western Australia, Perth, WA, 6009, Australia.
| | - Yibo Ying
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
- The Second School of Medicine, Wenzhou Medical University, 325027, Wenzhou, China
| | - Jiahui Ye
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
- The Second School of Medicine, Wenzhou Medical University, 325027, Wenzhou, China
| | - Min Chen
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
- The Second School of Medicine, Wenzhou Medical University, 325027, Wenzhou, China
| | - Qiuji Wu
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
- The Second School of Medicine, Wenzhou Medical University, 325027, Wenzhou, China
| | - Haicheng Dou
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
| | - Wenfei Ni
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
| | - Huazi Xu
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
| | - Jiake Xu
- School of Biomedical Sciences, The University of Western Australia, Perth, WA, 6009, Australia.
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Role of ABT888, a Novel Poly(ADP-Ribose) Polymerase (PARP) Inhibitor in Countering Autophagy and Apoptotic Processes Associated to Spinal Cord Injury. Mol Neurobiol 2020; 57:4394-4407. [PMID: 32729104 DOI: 10.1007/s12035-020-02033-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 07/22/2020] [Indexed: 02/04/2023]
Abstract
Accidents are the cause of some 50 deaths per 100,000 population each year; some 3% of these are from traumatic spinal cord injury (SCI), a damage that causes temporary or permanent motor deficits, often leading to permanent neurological alterations. The activation of poly(ADP-ribose) polymerase (PARP) as DNA damage response, together with autophagy and apoptosis processes contributes to the secondary injury processes seen after SCI. Thus, in the present study, a mouse compression model of SCI was used to determine whether the treatment with ABT888, as PARP-1/2 inhibitor, could restore the neuronal damage induced by SCI. Mice were orally administered with ABT888 (at a dose of 25 mg/kg) 1 h and 6 h after SCI induction. Histological analysis, myeloperoxidase (MPO) activity, and Basso Mouse scale (BMS) were performed. The expression of autophagy-related proteins and apoptosis-inducing factors was quantified in the cytosolic fraction from spinal cord tissue collected after 24 h after SCI. TUNEL assay was performed in SCI-tissues 24 h after damage. ABT888 treatment significantly reduced histological damage and neutrophilic infiltration, improving motor skills. PARP-1/2 inhibition by ABT888 slowed cell death, decreasing autophagy-activation proteins. These results showed that ABT888, inhibiting PARP-1/2 activity, through a reduction in the apoptosis-autophagy machinery, plays a protective role after SCI, suggesting a new insight into the potential application of ABT888 as novel candidate in SCI therapies.
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Valproic Acid: A Potential Therapeutic for Spinal Cord Injury. Cell Mol Neurobiol 2020; 41:1441-1452. [DOI: 10.1007/s10571-020-00929-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/20/2020] [Indexed: 02/06/2023]
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Neuroprotection of melatonin on spinal cord injury by activating autophagy and inhibiting apoptosis via SIRT1/AMPK signaling pathway. Biotechnol Lett 2020; 42:2059-2069. [PMID: 32514788 DOI: 10.1007/s10529-020-02939-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 06/05/2020] [Indexed: 12/23/2022]
Abstract
The effect of melatonin (MT) on spinal cord injury (SCI) has attracted increasing research attention. However, the specific role and molecular mechanism of MT on SCI have not been elucidated. An experiment was performed to investigate the effect and molecular mechanism of MT on the neuronal autophagy after SCI and its effect on the recovery of nerve function. The rats were randomly divided into four treatment groups: the SCI+MT+EX527 (SIRT1 inhibitor), SCI+MT, SCI, and sham operation groups. On the 14th day after SCI, MT significantly promoted the recovery of motor function in the hind limbs according to the results of Basso, Beattie, and Bresnahan scores. At the same time, MT treatment resulted in reduced activation of cleaved-caspase-3, cleaved-caspase-9, and terminal deoxynucleotidyl transferase dUTP nick end labeling-positive neurons and increased the survival of motoneurons in the anterior horn of the spinal cord on the 14th day after SCI, which exerted its neuroprotection. Furthermore, western blot and immunofluorescence double staining were performed to verify the molecular mechanism of effect of MT on SCI, and results showed the significantly upregulated expressions of Beclin-1, light chain-3B, SIRT1, p-AMPK proteins in the spinal cord tissue of MT-treated rats on the 14th day after SCI, however, the effect of MT on autophagy was reversed by EX527 (SIRT1 inhibitor), which implied that MT activated autophagy via SIRT1/AMPK signaling pathway after SCI. Similarly, the neuroprotective effects of MT on SCI were also inhibited after the SIRT1/AMPK signaling pathway was suppressed by EX527. Taken together, these results suggest that MT inhibits the apoptosis and activates autophagy of nerve cells after SCI and ultimately exerts the neuroprotective effect by SIRT1/AMPK signaling pathway.
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Ray SK. Modulation of autophagy for neuroprotection and functional recovery in traumatic spinal cord injury. Neural Regen Res 2020; 15:1601-1612. [PMID: 32209759 PMCID: PMC7437603 DOI: 10.4103/1673-5374.276322] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Spinal cord injury (SCI) is a serious central nervous system trauma that leads to loss of motor and sensory functions in the SCI patients. One of the cell death mechanisms is autophagy, which is 'self-eating' of the damaged and misfolded proteins and nucleic acids, damaged mitochondria, and other impaired organelles for recycling of cellular building blocks. Autophagy is different from all other cell death mechanisms in one important aspect that it gives the cells an opportunity to survive or demise depending on the circumstances. Autophagy is a therapeutic target for alleviation of pathogenesis in traumatic SCI. However, functions of autophagy in traumatic SCI remain controversial. Spatial and temporal patterns of activation of autophagy after traumatic SCI have been reported to be contradictory. Formation of autophagosomes following therapeutic activation or inhibition of autophagy flux is ambiguous in traumatic SCI studies. Both beneficial and harmful outcomes due to enhancement autophagy have been reported in traumatic SCI studies in preclinical models. Only further studies will make it clear whether therapeutic activation or inhibition of autophagy is beneficial in overall outcomes in preclinical models of traumatic SCI. Therapeutic enhancement of autophagy flux may digest the damaged components of the central nervous system cells for recycling and thereby facilitating functional recovery. Many studies demonstrated activation of autophagy flux and inhibition of apoptosis for neuroprotective effects in traumatic SCI. Therapeutic induction of autophagy in traumatic SCI promotes axonal regeneration, supporting another beneficial role of autophagy in traumatic SCI. In contrast, some other studies demonstrated that disruption of autophagy flux in traumatic SCI strongly correlated with neuronal death at remote location and impaired functional recovery. This article describes our current understanding of roles of autophagy in acute and chronic traumatic SCI, cross-talk between autophagy and apoptosis, therapeutic activation or inhibition of autophagy for promoting functional recovery, and future of autophagy in traumatic SCI.
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Affiliation(s)
- Swapan K. Ray
- Department of Pathology, Microbiology, and Immunology, University of South Carolina School of Medicine, Columbia, SC, USA,Correspondence to: Swapan K. Ray, .
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12
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Wang K, Peng S, Xiong S, Niu A, Xia M, Xiong X, Zeng G, Huang Q. Naringin inhibits autophagy mediated by PI3K-Akt-mTOR pathway to ameliorate endothelial cell dysfunction induced by high glucose/high fat stress. Eur J Pharmacol 2020; 874:173003. [PMID: 32045600 DOI: 10.1016/j.ejphar.2020.173003] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 02/03/2020] [Accepted: 02/07/2020] [Indexed: 12/14/2022]
Abstract
As a flavonoid, naringin (Nar) has been shown to have multiple pharmacological effects including lowering blood cholesterol, reducing thrombus formation and improving microcirculation. However, effects of Nar on function and autophagy of vascular endothelial cells under high glucose and high fat (HG/HF) stress are largely unclear. This study was designed to investigate such effects of Nar in human umbilical vein endothelial cells (HUVECs) and to determine whether such effects are related to autophagy. Our present results show that 86 μM of Nar inhibits the autophagy levels and protects the cells against the dysfunction induced by HG/HF stress. Moreover, Nar increases the phosphorylation levels of phosphatidylinositol-3-kinase (PI3K), protein kinase B (Akt) and mammalian rapamycin target protein (mTOR). However, pretreatment with rapamycin (RAPA, 5 μM, autophagy inducer), LY294002(10 μM, PI3K inhibitor) and Akt inhibitor Ⅳ (0.5 μM, Akt inhibitor) partially abrogates the protective effects of Nar, suggesting that the protective effects of Nar are achieved by activating the PI3K-Akt-mTOR pathway to inhibit autophagy. In conclusion, Nar improves the function of HUVECs under HG/HF stress through activating the PI3K-Akt-mTOR pathway to inhibit autophagy. The findings offer an insight into HG/HF stress-induced autophagy and indicate that Nar might have potential to prevent and treat the diabetic angiopathy.
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Affiliation(s)
- Kun Wang
- Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Shengjia Peng
- Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Nanchang Joint Programme, Queen Mary University of London, Nanchang, Jiangxi, 330006, PR China
| | - Shaofeng Xiong
- Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Ailin Niu
- Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Min Xia
- Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Xiaowei Xiong
- Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Guohua Zeng
- Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi, 330006, PR China
| | - Qiren Huang
- Provincial Key Laboratory of Basic Pharmacology, Nanchang University, Nanchang, Jiangxi, 330006, PR China; Department of Pharmacology, School of Pharmacy, Nanchang University, Nanchang, Jiangxi, 330006, PR China.
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Cong Y, Wang C, Wang J, Li H, Li Q. NT-3 Promotes Oligodendrocyte Proliferation and Nerve Function Recovery After Spinal Cord Injury by Inhibiting Autophagy Pathway. J Surg Res 2019; 247:128-135. [PMID: 31776022 DOI: 10.1016/j.jss.2019.10.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 10/17/2019] [Accepted: 10/22/2019] [Indexed: 12/31/2022]
Abstract
BACKGROUND Spinal cord injury (SCI) is a serious medical problem, leading to lifelong disability and increasing the health burden worldwide. Traditional treatments have limited effects on neuronal function recovery. Previous studies showed that neurotrophin-3 (NT-3) promoted oligodendrocyte survival and improved neuronal functional recovery after SCI. However, the mechanism by which NT-3 promotes oligodendrocyte survival after SCI remains unclear, which limits its application. MATERIALS AND METHODS A total of 75 female Sprague-Dawley rats were randomly divided into three groups: the NS group, NT-3 group, and NT-3 + rapamycin group. After successful modeling, the spinal cord specimens were taken at the corresponding time points. Western blot was used to detect autophagy-related proteins and Olig1 protein expression and combined with pathology, immunohistochemistry, flow cytometry, and other methods to detect the proliferation of oligodendrocytes after NT-3 application. RESULTS NT-3 was found to significantly promote the recovery of motor function by Basso-Beattie-Bresnahan scores analysis in the rat SCI model. Furthermore, intraspinal administration of NT-3 could downregulate the expression of Beclin-1 in oligodendrocytes, indicating that NT-3 could inhibit excessive autophagy of oligodendrocytes after SCI. The effects of NT-3 on oligodendrocyte survival could be blocked by an autophagy activator rapamycin. CONCLUSIONS This study found that NT-3 could promote the recovery of motor function after SCI in rats. The underlying reason may be that NT-3 inhibits the expression of autophagy proteins in oligodendrocytes and promotes oligodendrocyte proliferation. This study provided evidence for the future clinical application of NT-3 in SCI patients.
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Affiliation(s)
- Yan Cong
- Orthopaedic Professional, Guizhou Medical University, GuiYang, China
| | - Chunqing Wang
- Department of Orthopadic Trauma, Chief Physician, The Affiliated Hospital of Guizhou Medical University, GuiYang, China.
| | - Jiyao Wang
- Orthopaedic Professional, Guizhou Medical University, GuiYang, China
| | - Hexiang Li
- Orthopaedic Professional, Guizhou Medical University, GuiYang, China
| | - Qing Li
- Department of Orthopadic Trauma, Chief Physician, The Affiliated Hospital of Guizhou Medical University, GuiYang, China
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14
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Zhou ZB, Du D, Chen KZ, Deng LF, Niu YL, Zhu L. Differential Expression Profiles and Functional Predication of Circular Ribonucleic Acid in Traumatic Spinal Cord Injury of Rats. J Neurotrauma 2019; 36:2287-2297. [PMID: 30681027 DOI: 10.1089/neu.2018.6366] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Zhi-Bin Zhou
- Department of Orthopaedics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Di Du
- Department of Orthopaedics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Kai-Zhe Chen
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Orthopaedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lian-Fu Deng
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yu-Long Niu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, China
| | - Lei Zhu
- Department of Orthopaedics, Changzheng Hospital, Second Military Medical University, Shanghai, China
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15
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Wu J, Lipinski MM. Autophagy in Neurotrauma: Good, Bad, or Dysregulated. Cells 2019; 8:E693. [PMID: 31295858 PMCID: PMC6678153 DOI: 10.3390/cells8070693] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 07/06/2019] [Accepted: 07/09/2019] [Indexed: 12/12/2022] Open
Abstract
Autophagy is a physiological process that helps maintain a balance between the manufacture of cellular components and breakdown of damaged organelles and other toxic cellular constituents. Changes in autophagic markers are readily detectable in the spinal cord and brain following neurotrauma, including traumatic spinal cord and brain injury (SCI/TBI). However, the role of autophagy in neurotrauma remains less clear. Whether autophagy is good or bad is under debate, with strong support for both a beneficial and detrimental role for autophagy in experimental models of neurotrauma. Emerging data suggest that autophagic flux, a measure of autophagic degradation activity, is impaired in injured central nervous systems (CNS), and interventions that stimulate autophagic flux may provide neuroprotection in SCI/TBI models. Recent data demonstrating that neurotrauma can cause lysosomal membrane damage resulting in pathological autophagosome accumulation in the spinal cord and brain further supports the idea that the impairment of the autophagy-lysosome pathway may be a part of secondary injury processes of SCI/TBI. Here, we review experimental work on the complex and varied responses of autophagy in terms of both the beneficial and detrimental effects in SCI and TBI models. We also discuss the existing and developing therapeutic options aimed at reducing the disruption of autophagy to protect the CNS after injuries.
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Affiliation(s)
- Junfang Wu
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD 21201, USA.
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
- Center to Advance Chronic Pain Research, University of Maryland, Baltimore, MD 21201, USA.
| | - Marta M Lipinski
- Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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16
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Abstract
Previous studies have indicated that spinal cord injury can induce autophagy. To a certain extent, increased autophagy has a protective effect on neurons. Early hormone therapy is well recognized as a treatment for spinal cord injury. However, whether the protective effect of autophagy is important in recovery from spinal cord injury remains unclear. In this study, we established an in-vitro model of spinal cord injury to study the effects of dexamethasone on mechanical injury, autophagy, and apoptosis in spinal cord neurons. The results showed that dexamethasone inhibited the level of autophagy in the injured nerve cells in a dose-dependent manner. High doses of dexamethasone protected the damaged spinal cord neurons by inhibiting apoptosis, but a protective effect from low hormone concentrations was not obvious. When autophagy was inhibited in damaged spinal cord neurons, apoptosis decreased significantly; in contrast, impairment of autophagy-induced activation of spinal cord neurons and apoptosis levels were significantly increased.
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Lin Y, Li C, Li J, Deng R, Huang J, Zhang Q, Lyu J, Hao N, Zhong Z. NEP 1-40-modified human serum albumin nanoparticles enhance the therapeutic effect of methylprednisolone against spinal cord injury. J Nanobiotechnology 2019; 17:12. [PMID: 30670038 PMCID: PMC6341626 DOI: 10.1186/s12951-019-0449-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Accepted: 01/09/2019] [Indexed: 01/16/2023] Open
Abstract
Background Frequent injection of high-dose methylprednisolone (MP) is used to treat spinal cord injury (SCI), but free MP is associated with various side effects and its water solubility is low, limiting potential dosing regimes and administration routes. Albumin-based nanoparticles, which can encapsulate therapeutic drugs and release cargo in a controlled pattern, show high biocompatibility and low toxicity. The Nogo protein, expressed on the surface of oligodendrocytes, can inhibit axonal growth by binding with the axonal Nogo receptor (NgR). Peptide NEP1-40, an NgR antagonist, can bind specifically to Nogo, significantly improving functional recovery and axon growth in the corticospinal tract. Therefore, we hypothesized that delivering MP within nanoparticles decorated with NEP1-40 could avoid the disadvantages of free MP and enhance its therapeutic efficacy against SCI. Results We used human serum albumin to prepare MP-loaded NPs (MP-NPs), to whose surface we conjugated NEP1-40 to form NEP1-40-MP-NPs. Transmission electron microscopy indicated successful formation of nanoparticles. NEP1-40-MP-NPs were taken up significantly better than MP-NPs by the Nogo-positive cell line RSC-96 and were associated with significantly higher Basso–Beattie–Bresnahan locomotor scores in rats recovering from SCI. Micro-computed tomography assay showed that NEP1-40-MP-NPs mitigated SCI-associated loss of bone mineral density and accelerated spinal cord repair. Conclusions NEP1-40-MP-NPs can enhance the therapeutic effects of MP against SCI. This novel platform may also be useful for delivering other types of drugs. ![]() Electronic supplementary material The online version of this article (10.1186/s12951-019-0449-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yan Lin
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
| | - Chunhong Li
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
| | - Jian Li
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
| | - Ruolan Deng
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
| | - Juan Huang
- Luzhou TCM Hospital, Luzhou, 646000, China
| | | | - Jiayao Lyu
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China
| | - Na Hao
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China.
| | - Zhirong Zhong
- Department of Pharmaceutical Sciences, School of Pharmacy, Southwest Medical University, Luzhou, 646000, China. .,Key Laboratory of Drug Targeting and Drug Delivery System, Ministry of Education (Sichuan University), Chengdu, 610000, China. .,Key Laboratory of Medical Electrophysiology, Ministry of Education, Institute of Cardiovascular Research of Southwest Medical University, Luzhou, 646000, China.
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18
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Li XG, Du JH, Lu Y, Lin XJ. Neuroprotective effects of rapamycin on spinal cord injury in rats by increasing autophagy and Akt signaling. Neural Regen Res 2019; 14:721-727. [PMID: 30632514 PMCID: PMC6352584 DOI: 10.4103/1673-5374.247476] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Rapamycin treatment has been shown to increase autophagy activity and activate Akt phosphorylation, suppressing apoptosis in several models of ischemia reperfusion injury. However, little has been studied on the neuroprotective effects on spinal cord injury by activating Akt phosphorylation. We hypothesized that both effects of rapamycin, the increased autophagy activity and Akt signaling, would contribute to its neuroprotective properties. In this study, a compressive spinal cord injury model of rat was created by an aneurysm clip with a 30 g closing force. Rat models were intraperitoneally injected with rapamycin 1 mg/kg, followed by autophagy inhibitor 3-methyladenine 2.5 mg/kg and Akt inhibitor IV 1 µg/kg. Western blot assay, immunofluorescence staining and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling assay were used to observe the expression of neuronal autophagy molecule Beclin 1, apoptosis-related molecules Bcl-2, Bax, cytochrome c, caspase-3 and Akt signaling. Our results demonstrated that rapamycin inhibited the expression of mTOR in injured spinal cord tissue and up-regulated the expression of Beclin 1 and phosphorylated-Akt. Rapamycin prevented the decrease of bcl-2 expression in injured spinal cord tissue, reduced Bax, cytochrome c and caspase-3 expression levels and reduced the number of apoptotic neurons in injured spinal cord tissue 24 hours after spinal cord injury. 3-Methyladenine and Akt inhibitor IV intervention suppressed the expression of Beclin-1 and phosphorylated-Akt in injured spinal cord tissue and reduced the protective effect of rapamycin on apoptotic neurons. The above results indicate that the neuroprotective effect of rapamycin on spinal cord injury rats can be achieved by activating autophagy and the Akt signaling pathway.
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Affiliation(s)
- Xi-Gong Li
- Department of Orthopedic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Jun-Hua Du
- Department of Orthopedic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Yang Lu
- Department of Orthopedic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Xiang-Jin Lin
- Department of Orthopedic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
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19
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Xia D, Sui R, Min L, Zhang L, Zhang Z. Fastigial nucleus stimulation ameliorates cognitive impairment via modulating autophagy and inflammasomes activation in a rat model of vascular dementia. J Cell Biochem 2018; 120:5108-5117. [PMID: 30552710 DOI: 10.1002/jcb.27787] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/06/2018] [Indexed: 12/19/2022]
Affiliation(s)
- Dongjian Xia
- Department of Neurosurgery The First Affiliated Hospital to Jinzhou Medical University Jinzhou China
| | - Rubo Sui
- Department of Neurology The First Affiliated Hospital to Jinzhou Medical University Jinzhou China
| | - Lianqiu Min
- Department of Neurology The First Affiliated Hospital to Jinzhou Medical University Jinzhou China
| | - Ling Zhang
- Department of Neurology The First Affiliated Hospital to Jinzhou Medical University Jinzhou China
| | - Zhuang Zhang
- Department of Neurology The First Affiliated Hospital to Jinzhou Medical University Jinzhou China
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20
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Kertmen H, Celikoglu E, Ozturk OC, Gürer B, Bozkurt H, Kanat MA, Arikok AT, Erguder BI, Sargon MF, Sekerci Z. Comparative effects of methylprednisolone and tetracosactide (ACTH 1-24) on ischemia/reperfusion injury of the rabbit spinal cord. Arch Med Sci 2018; 14:1459-1470. [PMID: 30393502 PMCID: PMC6209702 DOI: 10.5114/aoms.2017.65650] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Accepted: 09/17/2016] [Indexed: 12/22/2022] Open
Abstract
INTRODUCTION Tetracosactide is an engineered peptide that applies the same biological impacts as the endogenous adrenocorticotropic hormone. Previous studies indicated that tetracosactide has anti-inflammatory, antioxidant and neurotrophic activity. In this study, we hypothesized that tetracosactide may have protective effects in spinal cord ischemia-reperfusion injury. MATERIAL AND METHODS Rabbits were randomized into the accompanying four groups of eight animals each: group 1 (control), group 2 (ischemia), group 3 (methylprednisolone) and group 4 (tetracosactide). In the control group, just a laparotomy was performed. In the various groups, the spinal cord ischemia model was made by the impediment of the aorta only caudal to the renal vein. Neurological assessment was conducted with the Tarlov scoring system. Levels of myeloperoxidase, malondialdehyde and catalase were analyzed, similar to the activities of xanthine oxidase and caspase-3. Histopathological and ultrastructural assessments were additionally performed. RESULTS After ischemia-reperfusion injury, increments were found in the tissue myeloperoxidase levels (p < 0.001), malondialdehyde levels (p < 0.001), xanthine oxidase action (p < 0.001) and caspase-3 movement (p < 0.001). Conversely, both serum and tissue catalase levels were diminished (p < 0.001 for both). After the administration of tetracosactide, declines were seen in the tissue myeloperoxidase levels (p < 0.001), malondialdehyde levels (p = 0.003), xanthine oxidase action (p < 0.001) and caspase-3 movement (p < 0.001). Conversely, both the serum and tissue catalase levels were expanded (p < 0.001). Besides, tetracosactide treatment indicated enhanced results related to the histopathological scores (p < 0.001), the ultra-structural score (p = 0.008) and the Tarlov scores (p < 0.001). CONCLUSIONS The findings showed for the first time that tetracosactide shows significant neuroprotective activity against ischemia-reperfusion injury of the spinal cord.
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Affiliation(s)
- Hayri Kertmen
- Neurosurgery Clinic, Diskapi Yildirim Beyazit Education and Research Hospital, Ministry of Health, Ankara, Turkey
| | - Erhan Celikoglu
- Neurosurgery Clinic, Fatih Sultan Mehmet Education and Research Hospital, Ministry of Health, Istanbul, Turkey
| | - Ozden Caglar Ozturk
- Neurosurgery Clinic, Mardin Nusaybin State Hospital, Ministry of Health, Mardin, Turkey
| | - Bora Gürer
- Neurosurgery Clinic, Fatih Sultan Mehmet Education and Research Hospital, Ministry of Health, Istanbul, Turkey
| | - Huseyin Bozkurt
- Department of Neurosurgery, Faculty of Medicine, Cumhuriyet University, Sivas, Turkey
| | - Mehmet Ali Kanat
- Refik Saydam National Public Health Agency, Ministry of Health, Ankara, Turkey
| | - Ata Turker Arikok
- Department of Pathology, Diskapi Yildirim Beyazit Education and Research Hospital, Ministry of Health, Ankara, Turkey
| | - Berrin Imge Erguder
- Department of Biochemistry, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - Mustafa Fevzi Sargon
- Department of Anatomy, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Zeki Sekerci
- Neurosurgery Clinic, Diskapi Yildirim Beyazit Education and Research Hospital, Ministry of Health, Ankara, Turkey
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21
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Muñoz-Galdeano T, Reigada D, Del Águila Á, Velez I, Caballero-López MJ, Maza RM, Nieto-Díaz M. Cell Specific Changes of Autophagy in a Mouse Model of Contusive Spinal Cord Injury. Front Cell Neurosci 2018; 12:164. [PMID: 29946241 PMCID: PMC6005838 DOI: 10.3389/fncel.2018.00164] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Accepted: 05/28/2018] [Indexed: 12/15/2022] Open
Abstract
Autophagy is an essential process of cellular waist clearance that becomes altered following spinal cord injury (SCI). Details on these changes, including timing after injury, underlying mechanisms, and affected cells, remain controversial. Here we present a characterization of autophagy in the mice spinal cord before and after a contusive SCI. In the undamaged spinal cord, analysis of LC3 and Beclin 1 autophagic markers reveals important differences in basal autophagy between neurons, oligodendrocytes, and astrocytes and even within cell populations. Following moderate contusion, western blot analyses of LC3 indicates that autophagy increases to a maximum at 7 days post injury (dpi), whereas unaltered Beclin 1 expression and increase of p62 suggests a possible blockage of autophagosome clearance. Immunofluorescence analyses of LC3 and Beclin 1 provide additional details that reveal a complex, cell-specific scenario. Autophagy is first activated (1 dpi) in the severed axons, followed by a later (7 dpi) accumulation of phagophores and/or autophagosomes in the neuronal soma without signs of increased initiation. Oligodendrocytes and reactive astrocytes also accumulate phagophores and autophagosomes at 7 dpi, but whereas the accumulation in astrocytes is associated with an increased autophagy initiation, it seems to result from a blockage of the autophagic flux in oligodendrocytes. Comparison with previous studies highlights the complex and heterogeneous autophagic responses induced by the SCI, leading in many cases to contradictory results and interpretations. Future studies should consider this complexity in the design of therapeutic interventions based on the modulation of autophagy to treat SCI.
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Affiliation(s)
- Teresa Muñoz-Galdeano
- Laboratory of Molecular Neuroprotection, UDI-HNP, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
| | - David Reigada
- Laboratory of Molecular Neuroprotection, UDI-HNP, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
| | - Ángela Del Águila
- Laboratory of Molecular Neuroprotection, UDI-HNP, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain.,Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States
| | - Irene Velez
- Laboratory of Molecular Neuroprotection, UDI-HNP, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
| | - Marcos J Caballero-López
- Laboratory of Molecular Neuroprotection, UDI-HNP, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
| | - Rodrigo M Maza
- Laboratory of Molecular Neuroprotection, UDI-HNP, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
| | - Manuel Nieto-Díaz
- Laboratory of Molecular Neuroprotection, UDI-HNP, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
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22
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Ozturk AM, Sozbilen MC, Sevgili E, Dagci T, Özyalcin H, Armagan G. Epidermal growth factor regulates apoptosis and oxidative stress in a rat model of spinal cord injury. Injury 2018; 49:1038-1045. [PMID: 29602490 DOI: 10.1016/j.injury.2018.03.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Revised: 02/13/2018] [Accepted: 03/20/2018] [Indexed: 02/02/2023]
Abstract
Spinal cord injury (SCI) leads to vascular damage and disruption of blood-spinal cord barrier which participates in secondary nerve injury. Epidermal growth factor (EGF) is an endogenous protein which regulates cell proliferation, growth and differention. Previous studies reported that EGF exerts neuroprotective effect in spinal cord after SCI. However, the molecular mechanisms underlying EGF-mediated protection in different regions of nervous system have not shown yet. In this study, we aimed to examine possible anti-apoptotic and protective roles of EGF not only in spinal cord but also in brain following SCI. Twenty-eight adult rats were divided into four groups of seven animals each as follows: sham, trauma (SCI), SCI + EGF and SCI + methylprednisolone (MP) groups. The functional neurological deficits due to the SCI were assessed by behavioral analysis using the Basso, Beattie and Bresnahan (BBB) open-field locomotor test. The alterations in pro-/anti-apoptotic protein levels and antioxidant enzyme activities were measured in spinal cord and frontal cortex. In our study, EGF promoted locomotor recovery and motor neuron survival of SCI rats. EGF treatment significantly decreased Bax and increased Bcl-2 protein expressions both in spinal cord and brain when compared to SCI group. Moreover, antioxidant enzyme activities including catalase, superoxide dismutase (SOD) and glutathione peroxidase (GPx) were increased following EGF treatment similar to MP treatment. Our experiment also suggests that alteration of the ratio of Bcl-2 to Bax may result from decreased apoptosis following EGF treatment. As a conclusion, these results show, for the first time, that administration of EGF exerts its protection via regulating apoptotic and oxidative pathways in response to spinal cord injury in different regions of central nervous system.
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Affiliation(s)
- Anil Murat Ozturk
- Department of Orthopaedic Surgery, School of Medicine Hospital, Ege University, Bornova, Izmir, Turkey.
| | - Murat Celal Sozbilen
- Department of Orthopaedics and Traumatology, Dr Behcet Uz Child Diseases and Surgery Research and Training Hospital, Konak, Izmir, Turkey
| | - Elvin Sevgili
- Department of Biochemistry, Faculty of Pharmacy, Ege University, Bornova, Izmir, Turkey
| | - Taner Dagci
- Department of Physiology, School of Medicine, Ege University, Bornova, Izmir, Turkey; Center for Brain Research, Ege University, Bornova, Izmir, Turkey
| | - Halit Özyalcin
- Department of Orthopaedic Surgery, School of Medicine Hospital, Ege University, Bornova, Izmir, Turkey
| | - Guliz Armagan
- Department of Biochemistry, Faculty of Pharmacy, Ege University, Bornova, Izmir, Turkey
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Wu F, Wei X, Wu Y, Kong X, Hu A, Tong S, Liu Y, Gong F, Xie L, Zhang J, Xiao J, Zhang H. Chloroquine Promotes the Recovery of Acute Spinal Cord Injury by Inhibiting Autophagy-Associated Inflammation and Endoplasmic Reticulum Stress. J Neurotrauma 2018; 35:1329-1344. [PMID: 29316847 DOI: 10.1089/neu.2017.5414] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Spinal cord injury (SCI) is a severe nervous system disease that may lead to lifelong disability. Studies have shown that autophagy plays a key role in various diseases; however, the mechanisms regulating cross-talk between autophagy, inflammation, and endoplasmic reticulum (ER) stress during SCI recovery remain unclear. This study was designed to investigate the mechanism by which chloroquine (CQ) inhibits autophagy-associated inflammation and ER stress in rats during their recovery from acute SCI. We evaluated the locomotor function, level of autophagy, and levels of inflammatory cytokines and ER-stress-associated proteins and examined the degradation of the key regulator of inflammation inhibitor of kappa B alpha (I-κBα) through autophagy by analyzing the colocalization of I-κBα, p62, and microtubule-associated protein 1 light chain 3-II. In addition, overexpression of the p62 and activating transcription factor 4 (ATF4) silencing plasmids was used to verify the important roles for autophagic degradation and ER stress. In this study, locomotor function is improved, and autophagy and inflammation are significantly inhibited by, CQ treatment in the model rats. In addition, CQ significantly inhibits the degradation of ubiquitinated I-κBα and blocks the nuclear translocation of nuclear factor kappa B p65 and expression of inflammatory factors. Overexpression of p62 increases I-κBα degradation and improves inflammatory responses. Moreover, CQ treatment also inhibits the activation of ER stress in the rat SCI model, and the ATF4 signaling pathway is required for ER-stress-induced activation of autophagy. These findings reveal a novel mechanism underlying the beneficial effects of CQ on the recovery of SCI, particularly the mechanisms regulating cross-talk between autophagy, inflammation, and ER stress.
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Affiliation(s)
- Fenzan Wu
- 1 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University , Wenzhou, China .,2 Department of Orthopaedics, Cixi People's Hospital, Wenzhou Medical University , Ningbo, China
| | - Xiaojie Wei
- 2 Department of Orthopaedics, Cixi People's Hospital, Wenzhou Medical University , Ningbo, China
| | - Yanqing Wu
- 3 The Institute of Life Sciences, Wenzhou University , Wenzhou, China
| | - Xiaoxia Kong
- 4 Institute of Hypoxia Research, School of Basic Medical Sciences, Wenzhou Medical University , Wenzhou, China
| | - Aiping Hu
- 1 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University , Wenzhou, China
| | - Songlin Tong
- 2 Department of Orthopaedics, Cixi People's Hospital, Wenzhou Medical University , Ningbo, China
| | - Yanlong Liu
- 1 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University , Wenzhou, China
| | - Fanhua Gong
- 1 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University , Wenzhou, China
| | - Ling Xie
- 1 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University , Wenzhou, China
| | - Jinjing Zhang
- 2 Department of Orthopaedics, Cixi People's Hospital, Wenzhou Medical University , Ningbo, China
| | - Jian Xiao
- 1 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University , Wenzhou, China .,2 Department of Orthopaedics, Cixi People's Hospital, Wenzhou Medical University , Ningbo, China
| | - Hongyu Zhang
- 1 Molecular Pharmacology Research Center, School of Pharmaceutical Science, Wenzhou Medical University , Wenzhou, China .,5 Science and Research Center, Dongyang People's Hosipital, Wenzhou Medical University , Jinhua, China
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24
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Sozbilen MC, Ozturk M, Kaftan G, Dagci T, Ozyalcin H, Armagan G. Neuroprotective Effects of C-terminal Domain of Tetanus Toxin on Rat Brain Against Motorneuron Damages After Experimental Spinal Cord Injury. Spine (Phila Pa 1976) 2018; 43:E327-E333. [PMID: 28767631 DOI: 10.1097/brs.0000000000002357] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Experimental animal study investigating the efficacy of C-terminal domain of tetanus toxin application as neuroprotective effects on rat brain in a model of spinal cord injury (SCI). OBJECTIVE The aim of the present study was to investigate the possible role of C-terminal domain of tetanus toxin (Hc-TeTx) on cell death mechanisms including apoptosis and autophagy following SCI. SUMMARY OF BACKGROUND DATA Traumatic SCI can lead to posttraumatic inflammation, oxidative stress, motor neuron apoptosis, necrosis, and autophagy of tissue. To promote and enhance recovery after SCI, recent development of devices and therapeutic interventions are needed. METHODS Twenty-eight adult rats were divided into four groups (n = 7 each) as follows: sham, trauma (SCI), SCI + Hc-TeTx, and SCI + methylprednisolone groups. The functional neurological deficits due to the SCI were assessed by behavioral analysis using the Basso, Beattie and Bresnahan (BBB) open-field locomotor test. The alterations in pro-/anti-apoptotic and autophagy related-protein levels were measured by Western blotting technique. RESULTS In this study, Hc-TeTx promotes locomotor recovery and motor neuron survival of SCI rats. Hc-TeTx also decreased expression of bax, bad, bak, cleaved caspase-3, Ask1, and autophagy-related proteins including Atg5 and LC3II in brain. Our study provides an evidence that cell death mechanisms play critical roles in SCI and that the nontoxic peptides including Hc-TeTx may exert protective effect and decrease cell death following SCI. CONCLUSION Our preliminary findings suggest a possible therapeutic agent to improve survival after spinal cord trauma, but further analysis are still needed to evaluate the difference between acute and chronic injuries. LEVEL OF EVIDENCE N/A.
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Affiliation(s)
- Murat Celal Sozbilen
- Department of Orthopaedics and Traumatology, Dr Behcet Uz Child Diseases and Surgery Research and Training Hospital, Konak Izmir, Turkey
| | - Murat Ozturk
- Department of Orthopaedic Surgery, School of Medicine Hospital, Ege University, Bornova, Izmir, Turkey
| | - Gizem Kaftan
- Department of Biochemistry, Faculty of Pharmacy, Ege University, Bornova, Izmir, Turkey
| | - Taner Dagci
- Department of Physiology, School of Medicine, Ege University, Bornova, Izmir, Turkey.,Center for Brain Research, Ege University, Bornova, Izmir, Turkey
| | - Halit Ozyalcin
- Department of Orthopaedic Surgery, School of Medicine Hospital, Ege University, Bornova, Izmir, Turkey
| | - Guliz Armagan
- Department of Biochemistry, Faculty of Pharmacy, Ege University, Bornova, Izmir, Turkey
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25
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Autophagy-independent increase of ATG5 expression in T cells of multiple sclerosis patients. J Neuroimmunol 2018; 319:100-105. [PMID: 29548704 DOI: 10.1016/j.jneuroim.2018.03.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 03/01/2018] [Accepted: 03/02/2018] [Indexed: 12/16/2022]
Abstract
Autophagy, a process of controlled self-digestion which regulates cell homeostasis, is involved in innate and adaptive immunity. We investigated the expression of autophagy genes and autophagic activity in distinct lymphocyte populations in treatment-naive MS patients. The mRNA and protein levels of autophagy-related (ATG)5, required for autophagosome formation, were increased in CD4+ and CD4- T cells, but not B cells of MS patients compared to control subjects. The expression of other investigated autophagy genes, as well as the autophagic activity, did not significantly differ between the two groups. ATG5 mRNA levels in CD4+ T cells from MS patients were positively correlated with those of the proinflammatory cytokine tumor necrosis factor. These data suggest that autophagy-independent increase in ATG5 expression might be associated with the proinflammatory capacity of T cells in multiple sclerosis.
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26
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Li Z, Liu F, Zhang L, Cao Y, Shao Y, Wang X, Jiang X, Chen Z. Neuroserpin restores autophagy and promotes functional recovery after acute spinal cord injury in rats. Mol Med Rep 2018; 17:2957-2963. [PMID: 29257287 PMCID: PMC5783514 DOI: 10.3892/mmr.2017.8249] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Accepted: 04/06/2017] [Indexed: 01/07/2023] Open
Abstract
This study is to reveal the characteristics of autophagy and the effect of neuroserpin (NSP) treatment on autophagy during the process of functional recovery following spinal cord injury (SCI). After the clip compress rat model of SCI had been made, autophagy‑associated proteins, including LC3‑II, beclin‑1 and p62, were evaluated at 2, 4, 24, 72 h, and 168 h in the experimental group, and the sham group as control. Transmission electron microscopy (TEM) was further used for autophagy detection at 4 and 72 h. All the male rats were randomly divided into three groups: Sham, vehicle and NSP group. NSP or an equal volume of saline vehicle was administered via intrathecal injection immediately after SCI. Each group was further divided into subgroups for the following experiments: i)Western blot (LC3‑II and p62); ii) Immunofluorescent double staining (LC3/MAP‑2/DAPI); iii) Nissl staining and Basso Beattie Bresnahan (BBB score) for NSP neuroprotection evaluation. Our results revealed both LC3‑II and p62 expression trended upward at 24, 72 and 168 h after SCI. The LC3‑II peaked at 72 h, while p62 peaked at 24 h. Beclin‑1 dropped significantly at 72 and 168 h. TEM results showed that autophagosomes largely accumulated at 72 h after SCI when compared with the sham group. Western blot analysis showed that LC3‑II and p62 were markedly decreased with NSP treatment at 72 h after injury compared with that of the vehicle‑group. Immunofluorescent double labeling indicated that accumulation of autophagosomes was reduced in the NSP group. Further, post‑SCI treatment with NSP improved the BBB scale and increased the number of anterior horn motor neurons. Together, this study demonstrates that autophagic flux is impaired, meanwhile NSP restores autophagic flux and promotes functional recovery after SCI in rats.
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Affiliation(s)
- Zheng Li
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - Fubing Liu
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, P.R. China
| | - Liang Zhang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - Yuanwu Cao
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - Yunchao Shao
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - Xiaofeng Wang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - Xiaoxing Jiang
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - Zixian Chen
- Department of Orthopaedics, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
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27
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He JL, Dong XH, Li ZH, Wang XY, Fu ZA, Shen N. Pterostilbene inhibits reactive oxygen species production and apoptosis in primary spinal cord neurons by activating autophagy via the mechanistic target of rapamycin signaling pathway. Mol Med Rep 2018; 17:4406-4414. [PMID: 29328494 PMCID: PMC5802216 DOI: 10.3892/mmr.2018.8412] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 11/13/2017] [Indexed: 01/14/2023] Open
Abstract
Autophagy is an important self-adaptive mechanism that is involved in inhibiting reactive oxygen species (ROS) in spinal cord neurons. Pterostilbene, a natural plant extract, has been demonstrated to possess antioxidant effects; however, it has not yet been investigated whether pterostilbene could activate autophagy and protect spinal cord neurons from oxidative stress. In the present study, primary spinal cord neurons of Sprague Dawley rats were cultured. Cell counting kit‑8 analysis was used to detect cytotoxicity of pterostilbene. Cells were treated with various doses of pterostilbene for 24 and 48 h, respectively, and H2O2 was used to induce ROS production. Western blot analysis was performed to assess the protein expression of microtubule‑associated protein 1 light chain 3 (LC3)‑II, Beclin‑1, p62, p‑p70S6K and p‑mechanistic target of rapamycin (mTOR). Furthermore, the green fluorescent protein (GFP)‑LC3 assay was used to detect the level of autophagy level and activation mechanism. 2',7'‑Dichlorofluorescin diacetate and MitoSOX Red staining were used to detect ROS production, and Terminal deoxynucleotidyl‑transferase‑mediated dUTP nick end labelling assay was used to analyze apoptosis percentage. ATG5 small interfering (si)RNA transfection was used to analyze the involvement of autophagy. A dose‑dependent increase in the expression of LC3‑II and Beclin‑1, as well as the p62 decline, were observed in the pterostilbene‑treated neurons; however, p‑p70S6K and p‑mTOR expression was inhibited by pterostilbene. Pterostilbene increased the expression of LC3‑II in H2O2‑treated cells, and GFP‑LC3 analysis demonstrated an increased number of autophagosomes. Furthermore, pterostilbene significantly inhibited the ROS production and apoptosis induced by H2O2; however, ATG5 siRNA transfection significantly reversed the protection of pterostilbene. These results indicate that pterostilbene may inhibit the ROS production and apoptosis in spinal cord neurons by activating autophagy via the mTOR signaling pathway.
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Affiliation(s)
- Jing-Lan He
- Department of Orthopedic Surgery, The Affiliated Hospital of Hebei University of Engineering, Handan, Hebei 056002, P.R. China
| | - Xiao-Hui Dong
- Department of Orthopedic Surgery, The Affiliated Hospital of Hebei University of Engineering, Handan, Hebei 056002, P.R. China
| | - Zong-Hu Li
- Department of Orthopedic Surgery, The Affiliated Hospital of Hebei University of Engineering, Handan, Hebei 056002, P.R. China
| | - Xiao-Ying Wang
- Department of Orthopedic Surgery, The Affiliated Hospital of Hebei University of Engineering, Handan, Hebei 056002, P.R. China
| | - Zhi-An Fu
- Department of Orthopedic Surgery, The Affiliated Hospital of Hebei University of Engineering, Handan, Hebei 056002, P.R. China
| | - Na Shen
- Department of Orthopedic Surgery, The Affiliated Hospital of Hebei University of Engineering, Handan, Hebei 056002, P.R. China
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28
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Wang P, Jiang L, Zhou N, Zhou H, Liu H, Zhao W, Zhang H, Zhang X, Hu Z. Resveratrol ameliorates autophagic flux to promote functional recovery in rats after spinal cord injury. Oncotarget 2018; 9:8427-8440. [PMID: 29492205 PMCID: PMC5823559 DOI: 10.18632/oncotarget.23877] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 11/08/2017] [Indexed: 12/15/2022] Open
Abstract
Resveratrol is known to improve functional recovery after spinal cord injury, but the exact mechanism involved is yet unclear. The aim of this study was to clarify whether resveratrol can exert neuroprotective effects via activating neuronal autophagic flux, in view of the underlying role of the autophagic flux mediated by resveratrol on neuronal apoptosis after spinal cord injury, and identify the role of the liver kinase B1(LKB1)/adenosine monophosphate-activated protein kinase (AMPK)/mammalian target of rapamycin (mTOR)/ p70 ribosomal protein S6 kinase (p70s6k) signal pathway in the autophagic flux mediated by resveratrol. The results obtained strongly indicate that resveratrol improved functional recovery in Sprague–Dawley rats after acute spinal cord injury, preserved their motor neurons, alleviated the neuronal apoptosis, and ameliorated neuronal autophagic flux. After blocking the autophagic flux, the neuroprotective effects of resveratrol were eliminated. Furthermore, it was proved that resveratrol can activate the LKB1/AMPK/mTOR/p70s6k pathway in vivo and in vitro, and the LKB1/AMPK/mTOR/p70s6k pathway plays a vital role in activating the autophagic flux mediated by resveratrol in PC12 cells. Thus, resveratrol enables to ameliorate neuronal autophagic flux via the LKB1/AMPK/mTOR/p70s6k pathway to alleviate apoptosis, and finally ameliorating functional recovery after acute SCI in SD rats.
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Affiliation(s)
- Peng Wang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Lizhu Jiang
- Department of Otorhinolaryngology Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Nian Zhou
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Hao Zhou
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Huzhe Liu
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Wenrui Zhao
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Hanxiang Zhang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Xiang Zhang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Zhenming Hu
- Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
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29
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Wang P, Lin C, Wu S, Huang K, Wang Y, Bao X, Zhang F, Huang Z, Teng H. Inhibition of Autophagy is Involved in the Protective Effects of Ginsenoside Rb1 on Spinal Cord Injury. Cell Mol Neurobiol 2017; 38:679-690. [PMID: 28762191 DOI: 10.1007/s10571-017-0527-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 07/24/2017] [Indexed: 11/29/2022]
Abstract
Spinal cord injury (SCI) is a devastating neurological disorder. Autophagy is induced and plays a crucial role in SCI. Ginsenoside Rb1 (Rb1), one of the major active components extracted from Panax Ginseng CA Meyer, has exhibited neuroprotective effects in various neurodegenerative diseases. However, it remains unknown whether autophagy is involved in the neuroprotection of Rb1 on SCI. In this study, we examined the regulation of autophagy following Rb1 treatment and its involvement in the Rb1-induced neuroprotection in SCI and in vitro injury model. Firstly, we found that Rb1 treatment decreased the loss of motor neurons and promoted function recovery in the SCI model. Furthermore, we found that Rb1 treatment inhibited autophagy in neurons, and suppressed neuronal apoptosis and autophagic cell death in the SCI model. Finally, in the in vitro injury model, Rb1 treatment increased the viability of PC12 cells and suppressed apoptosis by inhibiting excessive autophagy, whereas stimulation of autophagy by rapamycin abolished the anti-apoptosis effect of Rb1. Taken together, these findings suggest that the inhibition of autophagy is involved in the neuroprotective effects of Rb1 on SCI.
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Affiliation(s)
- Peng Wang
- Department of Spine Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.,Institute of Neuroscience and Institute of Hypoxia Medicine, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Chaowei Lin
- Department of Spine Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Shiyang Wu
- Department of Spine Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.,Institute of Neuroscience and Institute of Hypoxia Medicine, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Kelun Huang
- Department of Spine Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Yu Wang
- Department of Spine Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Xiaomei Bao
- Institute of Neuroscience and Institute of Hypoxia Medicine, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Fan Zhang
- Institute of Neuroscience and Institute of Hypoxia Medicine, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China
| | - Zhihui Huang
- Institute of Neuroscience and Institute of Hypoxia Medicine, Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.
| | - Honglin Teng
- Department of Spine Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325035, Zhejiang, China.
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30
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Hydrogen Sulfide Inhibits Autophagic Neuronal Cell Death by Reducing Oxidative Stress in Spinal Cord Ischemia Reperfusion Injury. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:8640284. [PMID: 28685010 PMCID: PMC5480044 DOI: 10.1155/2017/8640284] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 04/01/2017] [Accepted: 04/23/2017] [Indexed: 11/25/2022]
Abstract
Autophagy is upregulated in spinal cord ischemia reperfusion (SCIR) injury; however, its expression mechanism is largely unknown; moreover, whether autophagy plays a neuroprotective or neurodegenerative role in SCIR injury remains controversial. To explore these issues, we created an SCIR injury rat model via aortic arch occlusion. Compared with normal controls, autophagic cell death was upregulated in neurons after SCIR injury. We found that autophagy promoted neuronal cell death during SCIR, shown by a significant number of terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling- (TUNEL-) positive cells colabeled with the autophagy marker microtubule-associated protein 1 light chain 3, while the autophagy inhibitor 3-methyladenine reduced the number of TUNEL-positive cells and restored neurological and motor function. Additionally, we showed that oxidative stress was the main trigger of autophagic neuronal cell death after SCIR injury and N-acetylcysteine inhibited autophagic cell death and restored neurological and motor function in SCIR injury. Finally, we found that hydrogen sulfide (H2S) inhibited autophagic cell death significantly by reducing oxidative stress in SCIR injury via the AKT-the mammalian target of rapamycin (mTOR) pathway. These findings reveal that oxidative stress induces autophagic cell death and that H2S plays a neuroprotective role by reducing oxidative stress in SCIR.
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31
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Li H, Zhang Q, Yang X, Wang L. PPAR-γ agonist rosiglitazone reduces autophagy and promotes functional recovery in experimental traumaticspinal cord injury. Neurosci Lett 2017; 650:89-96. [PMID: 28433567 DOI: 10.1016/j.neulet.2017.02.075] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Revised: 02/27/2017] [Accepted: 02/28/2017] [Indexed: 12/21/2022]
Abstract
BACKGROUND Secondary damage is often more important in determining the functional outcome and provides a practical target for therapeutic intervention. Rosiglitazone (ROSG) is a potent PPAR-γ agonist and has been shown to induce neuroprotection in animal models of spinal cord injury (SCI). However, it is still unclear whether this PPAR-γ agonist can mediate neuronal autophagy after SCI. METHODS SCI was induced by application of vascular clips (force of 24g) to the dura via a four-level T5-T8 laminectomy. The role of the PPAR-γ agonist ROSG on neuronal autophagy induced by SCI was investigated. RESULTS The expression of autophagy-related proteins, including microtubule-associated protein 1 light chain 3 type II (LC3-II), beclin-1, and cathepsin D, increased significantly after SCI. ROSG downregulated autophagy-related protein expression and improved the locomotor function after SCI. GW9662 (a PPAR-γ inhibitor) significantly antagonized the effect of ROSG and abolished the protective effect on SCI. CONCLUSIONS Our results clearly demonstrated that the administration of ROSG after SCI reduced autophagy and promoted functional recovery after SCI in rats.
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Affiliation(s)
- Hongpeng Li
- Yuncheng Central Hospital, Shanxi 044000, PR China; Department of Emergency and Critical Care Medicine, Zhoupu Hospital affiliated with Shanghai University of Medicine and Health Sciences, Shanghai 201318, PR China.
| | - Qin Zhang
- Yuncheng Central Hospital, Shanxi 044000, PR China.
| | - Xiaohui Yang
- Yuncheng Central Hospital, Shanxi 044000, PR China
| | - Liping Wang
- Second Hospital of Lanzhou University, Gansu 730000, PR China
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32
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Kumar H, Jo MJ, Choi H, Muttigi MS, Shon S, Kim BJ, Lee SH, Han IB. Matrix Metalloproteinase-8 Inhibition Prevents Disruption of Blood–Spinal Cord Barrier and Attenuates Inflammation in Rat Model of Spinal Cord Injury. Mol Neurobiol 2017; 55:2577-2590. [DOI: 10.1007/s12035-017-0509-3] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 04/04/2017] [Indexed: 02/02/2023]
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33
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The Temporal Pattern, Flux, and Function of Autophagy in Spinal Cord Injury. Int J Mol Sci 2017; 18:ijms18020466. [PMID: 28230791 PMCID: PMC5343998 DOI: 10.3390/ijms18020466] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2016] [Revised: 02/16/2017] [Accepted: 02/17/2017] [Indexed: 12/15/2022] Open
Abstract
Previous studies have indicated that autophagy plays a critical role in spinal cord injury (SCI), including traumatic spinal cord injury (TSCI) and ischemia-reperfusion spinal cord injury (IRSCI). However, while the understanding of mechanisms underlying autophagy in SCI has progressed, there remain several controversial points: (1) temporal pattern results of autophagic activation after SCI are not consistent across studies; (2) effect of accumulation of autophagosomes due to the blockade or enhancement of autophagic flux is uncertain; (3) overall effect of enhanced autophagy remains undefined, with both beneficial and detrimental outcomes reported in SCI literature. In this review, the temporal pattern of autophagic activation, autophagic flux, autophagic cell death, relationship between autophagy and apoptosis, and pharmacological intervention of autophagy in TSCI (contusion injury, compression injury and hemisection injury) and IRSCI are discussed. Types of SCI and severity appear to contribute to differences in outcomes regarding temporal pattern, flux, and function of autophagy. With future development of specific strategies on autophagy intervention, autophagy may play an important role in improving functional recovery in patients with SCI.
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34
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Bai L, Mei X, Shen Z, Bi Y, Yuan Y, Guo Z, Wang H, Zhao H, Zhou Z, Wang C, Zhu K, Li G, Lv G. Netrin-1 Improves Functional Recovery through Autophagy Regulation by Activating the AMPK/mTOR Signaling Pathway in Rats with Spinal Cord Injury. Sci Rep 2017; 7:42288. [PMID: 28186165 PMCID: PMC5301251 DOI: 10.1038/srep42288] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 01/04/2017] [Indexed: 01/08/2023] Open
Abstract
Autophagy is an process for the degradation of cytoplasmic aggregated proteins and damaged organelles and plays an important role in the development of SCI. In this study, we investigated the therapeutic effect of Netrin-1 and its potential mechanism for autophagy regulation after SCI. A rat model of SCI was established and used for analysis. Results showed that administration of Netrin-1 not only significantly enhanced the phosphorylation of AMP-activated protein kinase (AMPK) but also reduced the phosphorylation of mammalian target of rapamycin (mTOR) and P70S6K. In addition, the expression of Beclin-1 and the ratio of the light-chain 3B-II (LC3B-II)/LC3B-I in the injured spinal cord significantly increased in Netrin-1 group than those in SCI group. Moreover, the ratio of apoptotic neurons in the anterior horn of the spinal cord and the cavity area of spinal cord significantly decreased in Netrin-1 group compared with those in SCI group. In addition, Netrin-1 not only preserved motor neurons but also significantly improved motor fuction of injured rats. These results suggest that Netrin-1 improved functional recovery through autophagy stimulation by activating the AMPK/mTOR signaling pathway in rats with SCI. Thus, Netrin-1 treatment could be a novel therapeutic strategy for SCI.
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Affiliation(s)
- Liangjie Bai
- Department of Orthopedics, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning, China
| | - Xifan Mei
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Zhaoliang Shen
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Yunlong Bi
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Yajiang Yuan
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Zhanpeng Guo
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Hongyu Wang
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Haosen Zhao
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Zipeng Zhou
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Chen Wang
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Kunming Zhu
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Gang Li
- Department of Orthopedics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou Liaoning, China
| | - Gang Lv
- Department of Orthopedics, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning, China
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Wei X, Zhou Z, Li L, Gu J, Wang C, Xu F, Dong Q, Zhou X. Intrathecal Injection of 3-Methyladenine Reduces Neuronal Damage and Promotes Functional Recovery via Autophagy Attenuation after Spinal Cord Ischemia/Reperfusion Injury in Rats. Biol Pharm Bull 2017; 39:665-73. [PMID: 27150140 DOI: 10.1248/bpb.b15-00610] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The present study aimed to determine the occurrence of autophagy following ischemia/reperfusion (I/R) injury in the rat spinal cord and whether autophagy inhibition contributes to neural tissue damage and locomotor impairment. A spinal cord I/R model was induced via descending thoracic aorta occlusion for 10 min using systemic hypotension (40 mmHg) in adult male Sprague-Dawley rats. Then, 600 nmol 3-methyladenine (3-MA) or vehicle was intrathecally administered. Ultrastructural spinal cord changes were observed via transmission electron microscopy (TEM) and immunofluorescent double-labeling. Western blots were used to determine the protein expression of microtubule-associated protein light chain 3 (LC3) and Beclin 1. Autophagy was activated after spinal cord I/R injury as demonstrated by significantly increased LC3 and Beclin 1 expression at 3-48 h after injury. Furthermore, TEM images indicated the presence of autophagosomes and autolysosomes in the injured spinal cord. 3-MA significantly decreased LC3 and Beclin 1 expression and the number of LC3-positive cells in spinal cord of I/R versus vehicle groups. Moreover, the 3-MA-treated rats exhibited better neurobehavioral scores compared with control rats. These findings suggest activation of autophagy leading to neuronal cell death in the I/R injured spinal cord. These effects were significantly inhibited by intrathecal 3-MA administration. Thus intrathecal 3-MA administration may represent a novel treatment target following spinal cord I/R injury.
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Affiliation(s)
- Xing Wei
- Department of Anesthesia, the Second Affiliated Hospital of Soochow University
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36
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Abstract
Inflammatory bowel disease [IBD] is characterized by chronic inflammation of the gastrointestinal tract. Medications such as corticosteroids, thiopurines, immunomodulators and biologic agents are used to induce and maintain remission; however, response to these drugs is variable and can diminish over time. Defective autophagy has been strongly linked to IBD pathogenesis, with evidence showing that enhancing autophagy may be therapeutically beneficial by regulating inflammation and clearing intestinal pathogens. It is plausible that the therapeutic effects of some IBD drugs are mediated in part through modulation of the autophagy pathway, with studies investigating a wide range of diseases and cell types demonstrating autophagy pathway regulation by these agents. This review will highlight the current evidence, both in vitro and in vivo, for the modulation of autophagy by drugs routinely used in IBD. A clearer understanding of their mechanisms of action will be invaluable to utilize these drugs in a more targeted and personalized manner in this diverse and often complex group of patients.
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Affiliation(s)
- Kirsty M. Hooper
- School of Life, Sport & Social Sciences, Edinburgh Napier University, Edinburgh, UK
| | - Peter G. Barlow
- School of Life, Sport & Social Sciences, Edinburgh Napier University, Edinburgh, UK
| | - Craig Stevens
- School of Life, Sport & Social Sciences, Edinburgh Napier University, Edinburgh, UK
| | - Paul Henderson
- Child Life and Health, University of Edinburgh, Edinburgh, UK,Department of Paediatric Gastroenterology and Nutrition, Royal Hospital for Sick Children, Edinburgh, UK
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Jin Y, Yang S, Zhang X. Reduction of neuronal damage and promotion of locomotor recovery after spinal cord injury by early administration of methylprednisolone: possible involvement of autophagy pathway. RSC Adv 2017. [DOI: 10.1039/c6ra25794a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Interaction between autophagy and apoptosis participates in the neuroprotective effect of methylprednisolone on spinal cord injury.
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Affiliation(s)
- Yichao Jin
- Department of Neurosurgery
- Shanghai Renji Hospital
- Shanghai Jiaotong University
- School of Medicine
- Shanghai 200127
| | - Shaofeng Yang
- Department of Neurosurgery
- Shanghai Renji Hospital
- Shanghai Jiaotong University
- School of Medicine
- Shanghai 200127
| | - Xiaohua Zhang
- Department of Neurosurgery
- Shanghai Renji Hospital
- Shanghai Jiaotong University
- School of Medicine
- Shanghai 200127
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38
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Bisicchia E, Latini L, Cavallucci V, Sasso V, Nicolin V, Molinari M, D'Amelio M, Viscomi MT. Autophagy Inhibition Favors Survival of Rubrospinal Neurons After Spinal Cord Hemisection. Mol Neurobiol 2016; 54:4896-4907. [PMID: 27514755 DOI: 10.1007/s12035-016-0031-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 08/01/2016] [Indexed: 12/19/2022]
Abstract
Spinal cord injuries (SCIs) are devastating conditions of the central nervous system (CNS) for which there are no restorative therapies. Neuronal death at the primary lesion site and in remote regions that are functionally connected to it is one of the major contributors to neurological deficits following SCI.Disruption of autophagic flux induces neuronal death in many CNS injuries, but its mechanism and relationship with remote cell death after SCI are unknown. We examined the function and effects of the modulation of autophagy on the fate of axotomized rubrospinal neurons in a rat model of spinal cord dorsal hemisection (SCH) at the cervical level. Following SCH, we observed an accumulation of LC3-positive autophagosomes (APs) in the axotomized neurons 1 and 5 days after injury. Furthermore, this accumulation was not attributed to greater initiation of autophagy but was caused by a decrease in AP clearance, as demonstrated by the build-up of p62, a widely used marker of the induction of autophagy. In axotomized rubrospinal neurons, the disruption of autophagic flux correlated strongly with remote neuronal death and worse functional recovery. Inhibition of AP biogenesis by 3-methyladenine (3-MA) significantly attenuated remote degeneration and improved spontaneous functional recovery, consistent with the detrimental effects of autophagy in remote damage after SCH. Collectively, our results demonstrate that autophagic flux is blocked in axotomized neurons on SCI and that the inhibition of AP formation improves their survival. Thus, autophagy is a promising target for the development of therapeutic interventions in the treatment of SCIs.
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Affiliation(s)
- Elisa Bisicchia
- Santa Lucia Foundation, I.R.C.C.S, Via del Fosso di Fiorano 64, 00143, Rome, Italy
| | - Laura Latini
- Santa Lucia Foundation, I.R.C.C.S, Via del Fosso di Fiorano 64, 00143, Rome, Italy
| | - Virve Cavallucci
- Santa Lucia Foundation, I.R.C.C.S, Via del Fosso di Fiorano 64, 00143, Rome, Italy
| | - Valeria Sasso
- Santa Lucia Foundation, I.R.C.C.S, Via del Fosso di Fiorano 64, 00143, Rome, Italy
| | - Vanessa Nicolin
- Clinical Department of Medical, Surgical and Health Science, University of Trieste, Trieste, Italy
| | - Marco Molinari
- Santa Lucia Foundation, I.R.C.C.S, Via del Fosso di Fiorano 64, 00143, Rome, Italy
| | - Marcello D'Amelio
- Santa Lucia Foundation, I.R.C.C.S, Via del Fosso di Fiorano 64, 00143, Rome, Italy. .,Department of Medicine, Unit of Molecular Neurosciences, University Campus-Biomedico, Via Alvaro del Portillo, 21, I-00128, Rome, Italy.
| | - Maria Teresa Viscomi
- Santa Lucia Foundation, I.R.C.C.S, Via del Fosso di Fiorano 64, 00143, Rome, Italy.
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Gao S, Zhang ZM, Shen ZL, Gao K, Chang L, Guo Y, Li Z, Wang W, Wang AM. Atorvastatin activates autophagy and promotes neurological function recovery after spinal cord injury. Neural Regen Res 2016; 11:977-82. [PMID: 27482228 PMCID: PMC4962597 DOI: 10.4103/1673-5374.184498] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Atorvastatin, a lipid-lowering medication, provides neuroprotective effects, although the precise mechanisms of action remain unclear. Our previous studies confirmed activated autophagy following spinal cord injury, which was conducive to recovery of neurological functions. We hypothesized that atorvastatin could also activate autophagy after spinal cord injury, and subsequently improve recovery of neurological functions. A rat model of spinal cord injury was established based on the Allen method. Atorvastatin (5 mg/kg) was intraperitoneally injected at 1 and 2 days after spinal cord injury. At 7 days post-injury, western blot assay, reverse transcription-polymerase chain reaction, and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) staining results showed increased Beclin-1 and light chain 3B gene and protein expressions in the spinal cord injury + atorvastatin group. Additionally, caspase-9 and caspase-3 expression was decreased, and the number of TUNEL-positive cells was reduced. Compared with the spinal cord injury + saline group, Basso, Beattie, and Bresnahan locomotor rating scale scores significantly increased in the spinal cord injury + atorvastatin group at 14-42 days post-injury. These findings suggest that atorvastatin activated autophagy after spinal cord injury, inhibited apoptosis, and promoted recovery of neurological function.
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Affiliation(s)
- Shuang Gao
- Department of Physiology, Jinzhou Medical University, Jinzhou, Liaoning Province, China
| | - Zhong-Ming Zhang
- Department of Orthopedics, Jinzhou Municipal Second Hospital, Jinzhou, Liaoning Province, China
| | - Zhao-Liang Shen
- Department of Orthopedics, Jinzhou Municipal Second Hospital, Jinzhou, Liaoning Province, China
| | - Kai Gao
- Department of Orthopedics, Jining No. 1 People's Hospital, Jining, Shandong Province, China
| | - Liang Chang
- Jinzhou Central Hospital, Jinzhou, Liaoning Province, China
| | - Yue Guo
- Department of Orthopedics, Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning Province, China
| | - Zhuo Li
- Department of Orthopedics, Jinzhou Municipal Second Hospital, Jinzhou, Liaoning Province, China
| | - Wei Wang
- Department of Orthopedics, First Hospital of Qinhuangdao City, Qinhuangdao, Hebei Province, China
| | - Ai-Mei Wang
- Department of Physiology, Jinzhou Medical University, Jinzhou, Liaoning Province, China
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40
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Siracusa R, Paterniti I, Bruschetta G, Cordaro M, Impellizzeri D, Crupi R, Cuzzocrea S, Esposito E. The Association of Palmitoylethanolamide with Luteolin Decreases Autophagy in Spinal Cord Injury. Mol Neurobiol 2016; 53:3783-3792. [PMID: 26143261 PMCID: PMC4937098 DOI: 10.1007/s12035-015-9328-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 06/26/2015] [Indexed: 12/28/2022]
Abstract
Spinal cord injury (SCI) is a devastating condition of the central nervous system (CNS) often resulting in severe functional impairment and for which there are not yet restorative therapies. In the present study, we performed a widely used model of SCI to determine the neuroprotective propriety of palmitoylethanolamide (PEA) and the antioxidant effect of a flavonoid luteolin (Lut), given as a co-ultramicronized compound co-ultraPEALut. In particular, by western blot analysis and immunofluorescence staining, we investigated whether this compound (at the dose of 1 mg/kg) was able to modulate autophagy. Our results showed that treatment with co-ultraPEALut after SCI reduced the expression of proteins promoter of autophagy such as Beclin-1 and microtubule-associated protein 1A/1B-light chain 3 (MAP-LC3). In contrast, this compound decreased the levels of mammalian target of rapamycin (mTOR), p-Akt, and p-70S6K which are proteins that inhibit autophagy. These data confirmed that the protective role of co-ultraPEALut is associated with inhibition of excessive autophagy and regulation of protein degradation. Therefore, treatment with co-ultraPEALut could be considered as a possible therapeutic approach in an acute traumatic lesion like SCI.
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Affiliation(s)
- Rosalba Siracusa
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy
| | - Irene Paterniti
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy
| | - Giuseppe Bruschetta
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy
| | - Marika Cordaro
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy
| | - Daniela Impellizzeri
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy
| | - Rosalia Crupi
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy
| | - Salvatore Cuzzocrea
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy
- Department of Pharmacological and Physiological Science, Saint Louis University School of Medicine, 1402 South Grand Blvd, St Louis, MO, 63104, USA
| | - Emanuela Esposito
- Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno D'Alcontres, 31, 98166, Messina, Italy.
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41
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Gao W, Chen SR, Wu MY, Gao K, Li YL, Wang HY, Li CY, Li H. Methylprednisolone exerts neuroprotective effects by regulating autophagy and apoptosis. Neural Regen Res 2016; 11:823-8. [PMID: 27335569 PMCID: PMC4904476 DOI: 10.4103/1673-5374.182711] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Methylprednisolone markedly reduces autophagy and apoptosis after secondary spinal cord injury. Here, we investigated whether pretreatment of cells with methylprednisolone would protect neuron-like cells from subsequent oxidative damage via suppression of autophagy and apoptosis. Cultured N2a cells were pretreated with 10 µM methylprednisolone for 30 minutes, then exposed to 100 µM H2O2 for 24 hours. Inverted phase contrast microscope images, MTT assay, flow cytometry and western blot results showed that, compared to cells exposed to 100 µM H2O2 alone, cells pretreated with methylprednisolone had a significantly lower percentage of apoptotic cells, maintained a healthy morphology, and showed downregulation of autophagic protein light chain 3B and Beclin-1 protein expression. These findings indicate that methylprednisolone exerted neuroprotective effects against oxidative damage by suppressing autophagy and apoptosis.
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Affiliation(s)
- Wei Gao
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
| | - Shu-Rui Chen
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
| | - Meng-Yao Wu
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
| | - Kai Gao
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
| | - Yuan-Long Li
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
| | - Hong-Yu Wang
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
| | - Chen-Yuan Li
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
| | - Hong Li
- Department of Biochemistry, Liaoning Medical University, Jinzhou, Liaoning Province, China
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42
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Probucol inhibits neural cell apoptosis via inhibition of mTOR signaling pathway after spinal cord injury. Neuroscience 2016; 329:193-200. [PMID: 27223630 DOI: 10.1016/j.neuroscience.2016.05.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/09/2016] [Accepted: 05/09/2016] [Indexed: 02/07/2023]
Abstract
Autophagy plays an essential role in neurodevelopment, axonal guidance, neuropathic pain remission, and neuronal survival. Inhibiting the mammalian target of rapamycin (mTOR) signaling pathway can induce the occurrence of autophagy. In this study, we initially detected the effect of probucol on autophagy after spinal cord injury (SCI) by intraperitoneally injecting spinal cord-injured rats with probucol for 7days. The levels of Beclin1 and LC3B were evidently enhanced at 7days post-operation. However, the increase in the phosphorylated AMP-activated protein kinase (AMPK) protein and the decrease in ribosomal protein S6 kinase p70 subtype (p70S6K) phosphorylation level simultaneously occurred after SCI. Moreover, the expression levels of apoptosis-related proteins of Caspase-3, Caspase-9, and Bax were significantly reduced. Immunofluorescence results indicated that the expression of Caspase-3 protein was evidently decreased and that of Beclin-1 protein was increased by probucol. Nissl staining and Basso, Beattie, and Bresnahan scores showed that the quantity and function of motor neurons were visibly preserved by probucol after SCI. This study showed that probucol inhibited the mTOR signaling pathway to induce autophagy, reduce neural cell apoptosis and promote recovery of neurological function after SCI.
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43
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Metformin Improves Functional Recovery After Spinal Cord Injury via Autophagy Flux Stimulation. Mol Neurobiol 2016; 54:3327-3341. [PMID: 27167128 DOI: 10.1007/s12035-016-9895-1] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2016] [Accepted: 04/21/2016] [Indexed: 12/15/2022]
Abstract
Spinal cord injury (SCI) is a severe neurological disease with few efficacious drugs. Autophagy is a cellular process to confront with stress after SCI and considered to be a therapeutic target of SCI. In this study, we investigated the therapeutic effect of metformin on functional recovery after SCI and its underlying mechanism of autophagy regulation. Using a rat model of traumatic SCI, we found improved function recovery which was paralleled by a reduction of apoptosis after metformin treatment. We further examined autophagy via detecting autophagosomes by transmission electron microscopy and immunofluorescence, as well as autophagy markers by western blot in each groups. The results showed that the number of autophagosomes and expression of autophagy markers such as LC3 and beclin1 were increased in SCI group, while autophagy substrate protein p62 as well as ubiquitinated proteins were found to accumulate in SCI group, indicating an impaired autophagy flux in SCI. But, metformin treatment attenuated the accumulation of p62 and ubiquitinated proteins, suggesting a stimulative effect of autophagy flux by metformin. Blockage of autophagy flux by chloroquine partially abolished the apoptosis inhibition and functional recovery effect of metformin on SCI, which suggested that the protective effect of metformin on SCI was through autophagy flux stimulation. Activation of AMPK as well as inhibition of its downstream mTOR signaling were detected under metformin treatment in vivo and in vitro; inhibition of AMPK signaling by compound C suppressed autophagy flux induced by metformin in vitro, indicating that AMPK signaling was involved in the effect of metformin on autophagy flux regulation. Together, these results illustrated that metformin improved functional recovery effect through autophagy flux stimulation and implied metformin to be a potential drug for SCI therapy.
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44
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Lu GB, Niu FW, Zhang YC, Du L, Liang ZY, Gao Y, Yan TZ, Nie ZK, Gao K. Methylprednisolone promotes recovery of neurological function after spinal cord injury: association with Wnt/β-catenin signaling pathway activation. Neural Regen Res 2016; 11:1816-1823. [PMID: 28123427 PMCID: PMC5204239 DOI: 10.4103/1673-5374.194753] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Some studies have indicated that the Wnt/β-catenin signaling pathway is activated following spinal cord injury, and expression levels of specific proteins, including low-density lipoprotein receptor related protein-6 phosphorylation, β-catenin, and glycogen synthase kinase-3β, are significantly altered. We hypothesized that methylprednisolone treatment contributes to functional recovery after spinal cord injury by inhibiting apoptosis and activating the Wnt/β-catenin signaling pathway. In the current study, 30 mg/kg methylprednisolone was injected into rats with spinal cord injury immediately post-injury and at 1 and 2 days post-injury. Basso, Beattie, and Bresnahan scores showed that methylprednisolone treatment significantly promoted locomotor functional recovery between 2 and 6 weeks post-injury. The number of surviving motor neurons increased, whereas the lesion size significantly decreased following methylprednisolone treatment at 7 days post-injury. Additionally, caspase-3, caspase-9, and Bax protein expression levels and the number of apoptotic cells were reduced at 3 and 7 days post-injury, while Bcl-2 levels at 7 days post-injury were higher in methylprednisolone-treated rats compared with saline-treated rats. At 3 and 7 days post-injury, methylprednisolone up-regulated expression and activation of the Wnt/β-catenin signaling pathway, including low-density lipoprotein receptor related protein-6 phosphorylation, β-catenin, and glycogen synthase kinase-3β phosphorylation. These results indicate that methylprednisolone-induced neuroprotection may correlate with activation of the Wnt/β-catenin signaling pathway.
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Affiliation(s)
- Gong-Biao Lu
- Department of Orthopedics, Jining No.1 People's Hospital, Jining, Shandong Province, China
| | - Fu-Wen Niu
- Department of Orthopedics, Jining No.1 People's Hospital, Jining, Shandong Province, China
| | - Ying-Chun Zhang
- Department of Interventional Radiology, Jining No.1 People's Hospital, Jining, Shandong Province, China
| | - Lin Du
- Jining Medical University, Jining, Shandong Province, China
| | - Zhi-Yuan Liang
- Department of Orthopedics, Jining No.1 People's Hospital, Jining, Shandong Province, China
| | - Yuan Gao
- Department of Orthopedics, Jining No.1 People's Hospital, Jining, Shandong Province, China
| | - Ting-Zhen Yan
- Department of Orthopedics, Jining No.1 People's Hospital, Jining, Shandong Province, China
| | - Zhi-Kui Nie
- Department of Orthopedics, Jining No.1 People's Hospital, Jining, Shandong Province, China
| | - Kai Gao
- Department of Orthopedics, Jining No.1 People's Hospital, Jining, Shandong Province, China
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Zhu L, Huang G, Sheng J, Fu Q, Chen A. High-mobility group box 1 induces neuron autophagy in a rat spinal root avulsion model. Neuroscience 2015; 315:286-95. [PMID: 26705737 DOI: 10.1016/j.neuroscience.2015.12.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Revised: 12/10/2015] [Accepted: 12/11/2015] [Indexed: 12/19/2022]
Abstract
Autophagy, a tightly regulated lysosome-dependent catabolic pathway, is implicated in various pathological states in the nervous system. High-mobility group box 1 (HMGB1) is an inflammatory mediator known to be released into the local microenvironment from damaged cells. However, whether autophagy is induced and exogenous HMGB1 is involved in the process of spinal root avulsion remain unclear. Here, we investigated the induction effect of autophagy and the possible role of HMGB1 during spinal root avulsion. It was found that autophagy was activated in the anterior horn of the spinal cord as represented by the increased expression of the autophagic marker microtubule-associated protein light chain 3-II (LC3-II), degradation of sequestosome 1 (p62), and formation of autophagosomes, and that autophagy was inhibited after intraperitoneal injection of anti-HMGB1-neutralizing antibodies in the rat spinal root avulsion model. In addition, HMGB1-induced autophagy and activated mitogen-activated protein kinases (MAPKs) in primary spinal neurons, including c-Jun N-terminal kinase (JNK), extracellular-signal-regulated kinase (ERK), and p38MAPK. Inhibition of JNK or ERK activity significantly blocked the effect of HMGB1-induced autophagy in primary spinal neurons. Finally, HMGB1-induced autophagy increased cell viability in primary spinal neurons under oxygen-glucose deprivation conditions. The above results suggest that HMGB1 is a critical regulator of autophagy and HMGB1-induced autophagy plays an important role in protecting spinal neurons against injury, which may provide new insights into the pathophysiological process of spinal root avulsion.
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Affiliation(s)
- L Zhu
- Department of Orthopedic Trauma Surgery, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Huangpu District, Shanghai 200003, China.
| | - G Huang
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.
| | - J Sheng
- Department of Burn Surgery, Changhai Hospital, 168 Changhai Road, Yangpu District, Shanghai 200433, China.
| | - Q Fu
- Department of Orthopedic Trauma Surgery, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Huangpu District, Shanghai 200003, China.
| | - A Chen
- Department of Orthopedic Trauma Surgery, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Huangpu District, Shanghai 200003, China.
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Guo Y, Liu S, Zhang X, Wang L, Gao J, Han A, Hao A. G-CSF promotes autophagy and reduces neural tissue damage after spinal cord injury in mice. J Transl Med 2015; 95:1439-49. [PMID: 26524416 DOI: 10.1038/labinvest.2015.120] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 04/24/2015] [Accepted: 04/28/2015] [Indexed: 12/19/2022] Open
Abstract
Granulocyte colony-stimulating factor (G-CSF) was investigated for its capacity to induce autophagy and related neuroprotective mechanisms in an acute spinal cord injury model. To accomplish this goal, we established a mouse spinal cord hemisection model to test the effects of recombinant human G-CSF. The results showed that autophagy was activated after spinal cord injury and G-CSF appears to induce a more rapid activation of autophagy within injured spinal cords as compared with that of non-treated animals. Apoptosis as induced in mechanically injured neurons with G-CSF treatment was enhanced after inhibiting autophagy by 3-methyladenine (3-MA), which partially blocked the neuroprotective effect of autophagy as induced by G-CSF. In addition, G-CSF inhibited the activity of the NF-κB signal pathway in neurons after mechanical injury. We conclude that G-CSF promotes autophagy by inhibiting the NF-κB signal pathway and protects neuronal structure after spinal cord injury. We therefore suggest that G-CSF, which rapidly induces autophagy after spinal cord injury to inhibit neuronal apoptosis, may thus provide an effective auxiliary therapeutic intervention for spinal cord injury.
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Affiliation(s)
- Yuji Guo
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, China
| | - Shangming Liu
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, China
| | - Xianghong Zhang
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, China
| | - Liyan Wang
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, China
| | - Jiangang Gao
- Institute of Developmental Biology, College of Life Science, Shandong University, Jinan, China
| | - Aiqing Han
- Department of Obstetrics, Maternal and Children Health Hospital of Jinan City, Jinan, China
| | - Aijun Hao
- Key Laboratory of the Ministry of Education for Experimental Teratology, Department of Histology and Embryology, Shandong University School of Medicine, Jinan, China
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HDAC6 Regulates the Chaperone-Mediated Autophagy to Prevent Oxidative Damage in Injured Neurons after Experimental Spinal Cord Injury. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2016:7263736. [PMID: 26649145 PMCID: PMC4663006 DOI: 10.1155/2016/7263736] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2015] [Revised: 07/10/2015] [Accepted: 07/22/2015] [Indexed: 11/17/2022]
Abstract
Hypoxia-ischemia- (HI-) induced oxidative stress plays a role in secondary pathocellular processes of acute spinal cord injury (SCI) due to HI from many kinds of mechanical trauma. Increasing evidence suggests that the histone deacetylase-6 (HDAC6) plays an important role in cell homeostasis in both physiological and abnormal, stressful, pathological conditions. This paper found that inhibition of HDAC6 accelerated reactive oxygen species (ROS) generation and cell apoptosis in response to the HI. Deficiency of HDAC6 hindered the chaperone-mediated autophagy (CMA) activity to resistance of HI-induced oxidative stress. Furthermore, this study provided the experimental evidence for the potential role of HDAC6 in the regulation of CMA by affecting HSP90 acetylation. Therefore, HDAC6 plays an important role in the function of CMA pathway under the HI stress induced by SCI and it may be a potential therapeutic target in acute SCI model.
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Gokce EC, Kahveci R, Atanur OM, Gürer B, Aksoy N, Gokce A, Sargon MF, Cemil B, Erdogan B, Kahveci O. Neuroprotective effects of Ganoderma lucidum polysaccharides against traumatic spinal cord injury in rats. Injury 2015; 46:2146-55. [PMID: 26298021 DOI: 10.1016/j.injury.2015.08.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 07/29/2015] [Accepted: 08/05/2015] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Ganoderma lucidum (G. lucidum) is a mushroom belonging to the polyporaceae family of Basidiomycota and has widely been used as a traditional medicine for thousands of years. G. lucidum has never been studied in traumatic spinal cord injury. The aim of this study is to investigate whether G. lucidum polysaccharides (GLPS) can protect the spinal cord after experimental spinal cord injury. MATERIALS AND METHODS Rats were randomized into five groups of eight animals each: control, sham, trauma, GLPS, and methylprednisolone. In the control group, no surgical intervention was performed. In the sham group, only a laminectomy was performed. In all the other groups, the spinal cord trauma model was created by the occlusion of the spinal cord with an aneurysm clip. In the spinal cord tissue, caspase-3 activity, tumour necrosis factor-alpha levels, myeloperoxidase activity, malondialdehyde levels, nitric oxide levels, and superoxide dismutase levels were analysed. Histopathological and ultrastructural evaluations were also performed. Neurological evaluation was performed using the Basso, Beattie, and Bresnahan locomotor scale and the inclined-plane test. RESULTS After traumatic spinal cord injury, increases in caspase-3 activity, tumour necrosis factor-alpha levels, myeloperoxidase activity, malondialdehyde levels, and nitric oxide levels were detected. After the administration of GLPS, decreases were observed in tissue caspase-3 activity, tumour necrosis factor-alpha levels, myeloperoxidase activity, malondialdehyde levels, and nitric oxide levels. Furthermore, GLPS treatment showed improved results in histopathological scores, ultrastructural scores, and functional tests. CONCLUSIONS Biochemical, histopathological, and ultrastructural analyses and functional tests reveal that GLPS exhibits meaningful neuroprotective effects against spinal cord injury.
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Affiliation(s)
- Emre Cemal Gokce
- Department of Neurosurgery, Turgut Ozal University, Emek, Ankara, Turkey
| | - Ramazan Kahveci
- Department of Neurosurgery, Ministry of Health, Kirikkale Yuksek Ihtisas State Hospital, Kirikkale, Turkey
| | - Osman Malik Atanur
- International Centre for Hydrogen Energy Technologies (UNIDO-ICHET), Cevizlibag, Zeytinburnu 34015, Istanbul, Turkey
| | - Bora Gürer
- Department of Neurosurgery, Ministry of Health, Fatih Sultan Mehmet Education and Research Hospital, Istanbul, Turkey.
| | - Nurkan Aksoy
- Department of Biochemistry, Kirikkale University, Kirikkale, Turkey
| | - Aysun Gokce
- Department of Pathology, Ministry of Health, Diskapi Yildirim Beyazit Education and Research Hospital, Ankara, Turkey
| | | | - Berker Cemil
- Department of Neurosurgery, Turgut Ozal University, Emek, Ankara, Turkey
| | - Bulent Erdogan
- Department of Neurosurgery, Turgut Ozal University, Emek, Ankara, Turkey
| | - Ozan Kahveci
- Department of Emergency Medicine, Bulent Ecevit University, Zonguldak, Turkey
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Neuroprotective Effect of Simvastatin via Inducing the Autophagy on Spinal Cord Injury in the Rat Model. BIOMED RESEARCH INTERNATIONAL 2015; 2015:260161. [PMID: 26539474 PMCID: PMC4619759 DOI: 10.1155/2015/260161] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 03/31/2015] [Indexed: 01/25/2023]
Abstract
Simvastatin, an inhibitor of 3-hydroxy-3-methylglutaryl-coenzyme A reductase, is invariably used to treat cardiovascular diseases. Simvastatin has been recently demonstrated to have a neuroprotective effect in nervous system diseases. The present study aimed to further verify the neuroprotection and molecular mechanism of simvastatin on rats after spinal cord injury (SCI). The expression of Beclin-1 and LC3-B was evidently enhanced at postoperation days 3 and 5, respectively. However, the reduction of the mTOR protein and ribosomal protein S6 kinase p70 subtype (p70S6K) phosphorylation level occurred at the same time after SCI. Simvastatin significantly increased the expression of brain-derived neurotrophic factor (BDNF) and glial cell line-derived neurotrophic factor (GDNF). Meanwhile, immunofluorescence results indicated that the expression of chondroitin sulfate proteoglycan (CSPG) and caspase-3 protein was obviously reduced by simvastatin. Furthermore, Nissl staining and Basso, Beattie, and Bresnahan (BBB) scores showed that the quantity and function of motor neurons were visibly preserved by simvastatin after SCI. The findings of this study showed that simvastatin induced autophagy by inhibiting the mTOR signaling pathway and contributed to neuroprotection after SCI.
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50
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Decuypere JP, Ceulemans LJ, Agostinis P, Monbaliu D, Naesens M, Pirenne J, Jochmans I. Autophagy and the Kidney: Implications for Ischemia-Reperfusion Injury and Therapy. Am J Kidney Dis 2015; 66:699-709. [PMID: 26169721 DOI: 10.1053/j.ajkd.2015.05.021] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 05/21/2015] [Indexed: 11/11/2022]
Abstract
Autophagy, an evolutionary conserved intracellular lysosome-dependent catabolic process, is an important mechanism for cellular homeostasis and survival during pathologic stress conditions in the kidney, such as ischemia-reperfusion injury (IRI). However, stimulation of autophagy has been described to both improve and exacerbate IRI in the kidney. We summarize the current understanding of autophagy in renal IRI and discuss possible reasons for these contradictory findings. Furthermore, we hypothesize that autophagy plays a dual role in renal IRI, having both protective and detrimental properties, depending on the duration of the ischemic period and the phase of the IRI process. Finally, we discuss the influence of currently used diuretics and immunosuppressive drugs on autophagy, underscoring the need to clarify the puzzling role of autophagy in renal IRI.
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Affiliation(s)
- Jean-Paul Decuypere
- Department of Microbiology and Immunology, Laboratory of Abdominal Transplantation, KU Leuven, University of Leuven, Leuven, Belgium; Department of Abdominal Transplant Surgery, University Hospitals Leuven, Leuven, Belgium.
| | - Laurens J Ceulemans
- Department of Microbiology and Immunology, Laboratory of Abdominal Transplantation, KU Leuven, University of Leuven, Leuven, Belgium; Department of Abdominal Transplant Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Patrizia Agostinis
- Department of Cellular and Molecular Medicine, Laboratory of Cell Death Research and Therapy, Leuven, Belgium
| | - Diethard Monbaliu
- Department of Microbiology and Immunology, Laboratory of Abdominal Transplantation, KU Leuven, University of Leuven, Leuven, Belgium; Department of Abdominal Transplant Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Maarten Naesens
- Department of Microbiology and Immunology, Laboratory of Nephrology, KU Leuven, University of Leuven, Leuven, Belgium; Department of Nephrology, University Hospitals Leuven, Leuven, Belgium
| | - Jacques Pirenne
- Department of Microbiology and Immunology, Laboratory of Abdominal Transplantation, KU Leuven, University of Leuven, Leuven, Belgium; Department of Abdominal Transplant Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Ina Jochmans
- Department of Microbiology and Immunology, Laboratory of Abdominal Transplantation, KU Leuven, University of Leuven, Leuven, Belgium; Department of Abdominal Transplant Surgery, University Hospitals Leuven, Leuven, Belgium
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