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Kimura S, Lok J, Gelman IH, Lo EH, Arai K. Role of A-Kinase Anchoring Protein 12 in the Central Nervous System. J Clin Neurol 2023; 19:329-337. [PMID: 37417430 DOI: 10.3988/jcn.2023.0095] [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: 03/10/2023] [Revised: 04/09/2023] [Accepted: 04/10/2023] [Indexed: 07/08/2023] Open
Abstract
A-kinase anchoring protein (AKAP) 12 is a scaffolding protein that anchors various signaling proteins to the plasma membrane. These signaling proteins include protein kinase A, protein kinase C, protein phosphatase 2B, Src-family kinases, cyclins, and calmodulin, which regulate their respective signaling pathways. AKAP12 expression is observed in the neurons, astrocytes, endothelial cells, pericytes, and oligodendrocytes of the central nervous system (CNS). Its physiological roles include promoting the development of the blood-brain barrier, maintaining white-matter homeostasis, and even regulating complex cognitive functions such as long-term memory formation. Under pathological conditions, dysregulation of AKAP12 expression levels may be involved in the pathology of neurological diseases such as ischemic brain injury and Alzheimer's disease. This minireview aimed to summarize the current literature on the role of AKAP12 in the CNS.
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Affiliation(s)
- Shintaro Kimura
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Life Science Research Center, Gifu University, Gifu, Japan
| | - Josephine Lok
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Pediatric Critical Care Medicine, Department of Pediatrics, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Irwin H Gelman
- Department of Cancer Genetics and Genomics, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Eng H Lo
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Ken Arai
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
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Maki T, Choi YK, Miyamoto N, Shindo A, Liang AC, Ahn BJ, Mandeville ET, Kaji S, Itoh K, Seo JH, Gelman IH, Lok J, Takahashi R, Kim KW, Lo EH, Arai K. A-Kinase Anchor Protein 12 Is Required for Oligodendrocyte Differentiation in Adult White Matter. Stem Cells 2018; 36:751-760. [PMID: 29314444 DOI: 10.1002/stem.2771] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 11/20/2017] [Accepted: 12/26/2017] [Indexed: 12/14/2022]
Abstract
Oligodendrocyte precursor cells (OPCs) give rise to oligodendrocytes in cerebral white matter. However, the underlying mechanisms that regulate this process remain to be fully defined, especially in adult brains. Recently, it has been suggested that signaling via A-kinase anchor protein 12 (AKAP12), a scaffolding protein that associates with intracellular molecules such as protein kinase A, may be involved in Schwann cell homeostasis and peripheral myelination. Here, we asked whether AKAP12 also regulates the mechanisms of myelination in the CNS. AKAP12 knockout mice were compared against wild-type (WT) mice in a series of neurochemical and behavioral assays. Compared with WTs, 2-months old AKAP12 knockout mice exhibited loss of myelin in white matter of the corpus callosum, along with perturbations in working memory as measured by a standard Y-maze test. Unexpectedly, very few OPCs expressed AKAP12 in the corpus callosum region. Instead, pericytes appeared to be one of the major AKAP12-expressing cells. In a cell culture model system, conditioned culture media from normal pericytes promoted in-vitro OPC maturation. However, conditioned media from AKAP12-deficient pericytes did not support the OPC function. These findings suggest that AKAP12 signaling in pericytes may be required for OPC-to-oligodendrocyte renewal to maintain the white matter homeostasis in adult brain. Stem Cells 2018;36:751-760.
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Affiliation(s)
- Takakuni Maki
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Yoon Kyung Choi
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Integrative Bioscience and Biotechnology, Konkuk University, Republic of Korea
| | - Nobukazu Miyamoto
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Akihiro Shindo
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Anna C Liang
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Bum Ju Ahn
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Emiri T Mandeville
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Seiji Kaji
- Department of Neurology, Graduate School of Medicine, Kyoto University, Japan
| | - Kanako Itoh
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Ji Hae Seo
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- NeuroVascular Coordination Research Center, College of Pharmacy and Research Institute of Pharmaceutical Sciences
- Department of Biochemistry, Keimyung University School of Medicine, Daegu, 42601, Korea
| | - Irwin H Gelman
- Department of Cancer Genetics, Roswell Park Cancer Institute, Buffalo, New York, USA
| | - Josephine Lok
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Ryosuke Takahashi
- Department of Neurology, Graduate School of Medicine, Kyoto University, Japan
| | - Kyu-Won Kim
- NeuroVascular Coordination Research Center, College of Pharmacy and Research Institute of Pharmaceutical Sciences
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 151-742, Korea
| | - Eng H Lo
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Ken Arai
- Neuroprotection Research Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
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Boerboom A, Dion V, Chariot A, Franzen R. Molecular Mechanisms Involved in Schwann Cell Plasticity. Front Mol Neurosci 2017; 10:38. [PMID: 28261057 PMCID: PMC5314106 DOI: 10.3389/fnmol.2017.00038] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 01/31/2017] [Indexed: 01/09/2023] Open
Abstract
Schwann cell incredible plasticity is a hallmark of the utmost importance following nerve damage or in demyelinating neuropathies. After injury, Schwann cells undergo dedifferentiation before redifferentiating to promote nerve regeneration and complete functional recovery. This review updates and discusses the molecular mechanisms involved in the negative regulation of myelination as well as in the reprogramming of Schwann cells taking place early following nerve lesion to support repair. Significant advance has been made on signaling pathways and molecular components that regulate SC regenerative properties. These include for instance transcriptional regulators such as c-Jun or Notch, the MAPK and the Nrg1/ErbB2/3 pathways. This comprehensive overview ends with some therapeutical applications targeting factors that control Schwann cell plasticity and highlights the need to carefully modulate and balance this capacity to drive nerve repair.
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Affiliation(s)
| | - Valérie Dion
- GIGA-Neurosciences, University of Liège Liège, Belgium
| | - Alain Chariot
- GIGA-Molecular Biology of Diseases, University of LiègeLiège, Belgium; Walloon Excellence in Lifesciences and Biotechnology (WELBIO)Wavre, Belgium
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Yang L, Zhu J, Huang H, Yang Q, Cai J, Wang Q, Zhu J, Shao M, Xiao J, Cao J, Gu X, Zhang S, Wang Y. PFTK1 Promotes Gastric Cancer Progression by Regulating Proliferation, Migration and Invasion. PLoS One 2015; 10:e0140451. [PMID: 26488471 PMCID: PMC4619205 DOI: 10.1371/journal.pone.0140451] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 09/25/2015] [Indexed: 11/18/2022] Open
Abstract
PFTK1, also known as PFTAIRE1, CDK14, is a novel member of Cdc2-related serine/threonine protein kinases. Recent studies show that PFTK1 is highly expressed in several malignant tumors such as hepatocellular carcinoma, esophageal cancer, breast cancer, and involved in regulation of cell cycle, tumors proliferation, migration, and invasion that further influence the prognosis of tumors. However, the expression and physiological significance of PFTK1 in gastric cancer remain unclear. In this study, we analyzed the expression and clinical significance of PFTK1 by Western blot in 8 paired fresh gastric cancer tissues, nontumorous gastric mucosal tissues and immunohistochemistry on 161 paraffinembedded slices. High PFTK1 expression was correlated with the tumor grade, lymph node invasion as well as Ki-67. Through Cell Counting Kit (CCK)-8 assay, flow cytometry, colony formation, wound healing and transwell assays, the vitro studies demonstrated that PFTK1 overexpression promoted proliferation, migration and invasion of gastric cancer cells, while PFTK1 knockdown led to the opposite results. Our findings for the first time supported that PFTK1 might play an important role in the regulation of gastric cancer proliferation, migration and would provide a novel promising therapeutic strategy against human gastric cancer.
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Affiliation(s)
- Lei Yang
- Department of Oncology, Nantong Tumor Hospital, Nantong, Jiangsu, China
| | - Jia Zhu
- Department of Oncology, Nantong Tumor Hospital, Nantong, Jiangsu, China
| | - Hua Huang
- Department of Pathology, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
| | - Qichang Yang
- Department of Pathology, Nantong first people's hospital, Nantong, Jiangsu, China
| | - Jing Cai
- Department of Oncology, Nantong Tumor Hospital, Nantong, Jiangsu, China
| | - Qiuhong Wang
- Department of Oncology, Nantong Tumor Hospital, Nantong, Jiangsu, China
| | - Junya Zhu
- Department of Pathogen Biology, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong 226001, Jiangsu, China
| | - Mengting Shao
- Department of Pathogen Biology, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong 226001, Jiangsu, China
| | - Jinzhang Xiao
- Department of Oncology, Nantong Tumor Hospital, Nantong, Jiangsu, China
| | - Jie Cao
- Department of Pathology, Nantong first people's hospital, Nantong, Jiangsu, China
| | - Xiaodan Gu
- Department of Pathogen Biology, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong 226001, Jiangsu, China
| | - Shusen Zhang
- Department of Pathogen Biology, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong 226001, Jiangsu, China
| | - Yingying Wang
- Department of Pathogen Biology, Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong 226001, Jiangsu, China
- * E-mail:
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Upregulation of KPNβ1 in gastric cancer cell promotes tumor cell proliferation and predicts poor prognosis. Tumour Biol 2015; 37:661-72. [PMID: 26242264 DOI: 10.1007/s13277-015-3839-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 07/24/2015] [Indexed: 12/14/2022] Open
Abstract
KPNβ1, also known as importin β, P97, is reported as one of soluble transport factors that mediates transportion of proteins and RNAs between the nucleus and cytoplasm in cellular process. Recent studies show that KPNβ1 is a tumor gene which is highly expressed in several malignant tumors such as ovarian cancer, cervical tumor, neck cancer, and lung cancer via promoting cell proliferation or inhibiting cell apoptotic pathways. However, the the role of KPNβ1 in gastric cancer remains unclear. In this study, Western blot and immunohistochemistrical analyses showed that KPNβ1 was significantly upregulated in clinical gastric cancer specimens compared with adjacent noncancerous tissues. KPNβ1 was positively correlated with tumor grade, Ki-67, and predicted poor prognosis of gastric cancer. More importantly, through starvation-refeeding model, CCK8 assay, flow cytometry, colony formation assays, the vitro studies demonstrated that KPNβ1 promoted proliferation of gastric cancer cells, while KPNβ1 knockdown led to decreased cell proliferation and arrested cell cycle at G1 phase. Furthermore, our results also indicated that KPNβ1 expression could result in docetaxel resistance. And, KPNβ1 could interact with Stat1, contributed to its nucleus import in gastric cancer cells. These findings provided a novel promising therapeutic targets for clinical treatment against human gastric cancer.
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Nishimoto S, Tanaka H, Okamoto M, Okada K, Murase T, Yoshikawa H. Methylcobalamin promotes the differentiation of Schwann cells and remyelination in lysophosphatidylcholine-induced demyelination of the rat sciatic nerve. Front Cell Neurosci 2015; 9:298. [PMID: 26300733 PMCID: PMC4523890 DOI: 10.3389/fncel.2015.00298] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Accepted: 07/20/2015] [Indexed: 12/31/2022] Open
Abstract
Schwann cells (SCs) are constituents of the peripheral nervous system. The differentiation of SCs in injured peripheral nerves is critical for regeneration after injury. Methylcobalamin (MeCbl) is a vitamin B12 analog that is necessary for the maintenance of the peripheral nervous system. In this study, we estimated the effect of MeCbl on SCs. We showed that MeCbl downregulated the activity of Erk1/2 and promoted the expression of the myelin basic protein in SCs. In a dorsal root ganglion neuron–SC coculture system, myelination was promoted by MeCbl. In a focal demyelination rat model, MeCbl promoted remyelination and motor and sensory functional regeneration. MeCbl promoted the in vitro differentiation of SCs and in vivo myelination in a rat demyelination model and may be a novel therapy for several types of nervous disorders.
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Affiliation(s)
- Shunsuke Nishimoto
- Department of Orthopaedic Surgery, Graduate School of Medicine, Osaka University, Suita Japan
| | - Hiroyuki Tanaka
- Department of Orthopaedic Surgery, Graduate School of Medicine, Osaka University, Suita Japan
| | - Michio Okamoto
- Department of Orthopaedic Surgery, Toyonaka Municipal Hospital, Toyonaka Japan
| | - Kiyoshi Okada
- Department of Orthopaedic Surgery, Graduate School of Medicine, Osaka University, Suita Japan ; Medical Center for Translational and Clinical Research, Osaka University Hospital, Suita Japan
| | - Tsuyoshi Murase
- Department of Orthopaedic Surgery, Graduate School of Medicine, Osaka University, Suita Japan
| | - Hideki Yoshikawa
- Department of Orthopaedic Surgery, Graduate School of Medicine, Osaka University, Suita Japan
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Yao L, Liu YH, Li X, Ji YH, Yang XJ, Hang XT, Ding ZM, Liu F, Wang YH, Shen AG. CRMP1 Interacted with Spy1 During the Collapse of Growth Cones Induced by Sema3A and Acted on Regeneration After Sciatic Nerve Crush. Mol Neurobiol 2014; 53:879-893. [PMID: 25526860 DOI: 10.1007/s12035-014-9049-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 12/02/2014] [Indexed: 01/13/2023]
Abstract
CRMP1, a member of the collapsin response mediator protein family (CRMPs), was reported to regulate axon outgrowth in Sema3A signaling pathways via interactions with its co-receptor protein neuropilin-1 and plexin-As through the Fyn-cyclin-dependent kinase 5 (CDK5) cascade and the sequential phosphorylation of CRMP1 by lycogen synthase kinase-3β (GSK-3β). Using yeast two-hybrid, we identified a new molecule, Speedy A1 (Spy1), a member of the Speedy/RINGO family, with an interaction with CRMP1. Besides, for the first time, we observed the association of CRMP1 with actin. Based on this, we wondered the association of them and their function in Sema3A-induced growth cones collapse and regeneration process after SNC. During our study, we constructed overexpression plasmid and short hairpin RNA (shRNA) to question the relationship of CRMP1/Spy1 and CRMP1/actin. We observed the interactions of CRMP1/Spy1 and CRMP1/actin. Besides, we found that Spy1 could affect CRMP1 phosphorylation actived by CDK5 and that enhanced CRMP1 phosphorylation might disturb the combination of CRMP1 and actin, which would contribute to abnormal of Sema3A-induced growth cones collapse and finally lead to influent regeneration process after rat sciatic nerve crush. Through rat walk footprint test, we also observed the variance during regeneration progress, respectively. We speculated that CRMP1 interacted with Spy1 which would disturb the association of CRMP1 with actin and was involved in the collapse of growth cones induced by Sema3A and regeneration after sciatic nerve crush.
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Affiliation(s)
- Li Yao
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China.,Department of Immunology, Medical College, Jiangnan University, Wuxi, Jiangsu, 214122, People's Republic of China
| | - Yong-Hua Liu
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China
| | - Xiaohong Li
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China
| | - Yu-Hong Ji
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China
| | - Xiao-Jing Yang
- Department of Oncology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Xian-Ting Hang
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China
| | - Zong-Mei Ding
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China
| | - Fang Liu
- Key Laboratory of Neuroregeneration, Nantong University, Nantong, Jiangsu, 226001, People's Republic of China
| | - You-Hua Wang
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China.
| | - Ai-Guo Shen
- Department of Orthopaedics, Affiliated Hospital of Nantong University and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Medical College of Nantong University, Nantong, Jiangsu Province, 226001, People's Republic of China.
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Involvement of upregulated SYF2 in Schwann cell differentiation and migration after sciatic nerve crush. Cell Mol Neurobiol 2014; 34:1023-36. [PMID: 24962097 DOI: 10.1007/s10571-014-0078-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 06/02/2014] [Indexed: 01/22/2023]
Abstract
SYF2 is a putative homolog of human p29 in Saccharomyces cerevisiae. It seems to be involved in pre-mRNA splicing and cell cycle progression. Disruption of SYF2 leads to reduced α-tubulin expression and delayed nerve system development in zebrafish. Due to the potential of SYF2 in modulating microtubule dynamics in nervous system, we investigated the spatiotemporal expression of SYF2 in a rat sciatic nerve crush (SNC) model. We found that SNC resulted in a significant upregulation of SYF2 from 3 days to 1 week and subsequently returned to the normal level at 4 weeks. At its peak expression, SYF2 distributed predominantly in Schwann cells. In addition, upregulation of SYF2 was approximately in parallel with Oct-6, and numerous Schwann cells expressing SYF2 were Oct-6 positive. In vitro, we observed enhanced expression of SYF2 during the process of cyclic adenosine monophosphate (cAMP)-induced Schwann cell differentiation. SYF2-specific siRNA-transfected Schwann cells did not show significant morphological change in the process of Schwann cell differentiation. Also, we found shorter and disorganized microtubule structure and a decreased migration in SYF2-specific siRNA-transfected Schwann cells. Together, these findings indicated that the upregulation of SYF2 was associated with Schwann cell differentiation and migration following sciatic nerve crush.
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Temporal-spatial expressions of Spy1 in rat sciatic nerve after crush. Cell Mol Neurobiol 2012; 33:213-21. [PMID: 23129232 DOI: 10.1007/s10571-012-9887-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 10/24/2012] [Indexed: 01/29/2023]
Abstract
As a novel cell cycle protein, Spy1 enhances cell proliferation, promotes the G1/S transition as well as inhibits apoptosis in response to UV irradiation. Spy1 levels are tightly regulated during mammary development, and overexpression of Spy1 accelerates tumorigenesis in vivo. But little is known about the role of Spy1 in the pathological process of damage and regeneration of the peripheral nervous system. Here we established a rat sciatic nerve crush (SNC) model to examine the spatiotemporal expression of Spy1. Spy1 expression was elevated gradually after sciatic nerve crush and peaked at day 3. The alteration was due to the increased expression of Spy1 in axons and Schwann cells after SNC. Spy1 expression correlated closely with Schwann cells proliferation in sciatic nerve post injury. Furthermore, Spy1 largely localized in axons in the crushed segment, but rarely co-localized with GAP43. These findings suggested that Spy1 participated in the pathological process response to sciatic nerve injury and may be associated with Schwann cells proliferation and axons regeneration.
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Wu H, Liu Y, Zhou Y, Long L, Cheng X, Ji L, Weng H, Ding T, Yang J, Wei H, Li M, Huan W, Deng X, Wang Y. Changes in the BAG1 expression of Schwann cells after sciatic nerve crush. J Mol Neurosci 2012; 49:512-22. [PMID: 23108487 DOI: 10.1007/s12031-012-9910-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 10/18/2012] [Indexed: 12/14/2022]
Abstract
Bcl-2-associated athanogene-1 (BAG1), a co-chaperone for Hsp70/Hsc70, is a multifunctional protein, which has been shown to suppress apoptosis and enhance neuronal differentiation. However, the expression and roles of BAG1 in peripheral system lesions and repair are still unknown. In this study, we investigated the dynamic changes in BAG1 expression in an acute sciatic nerve crush model in adult rats. Western blot analysis revealed that BAG1 was expressed in normal sciatic nerves. BAG1 expression increased progressively after sciatic nerve crush, reached a peak 2 weeks post-injury, and then returned to the normal level 4 weeks post-injury. Spatially, we observed that BAG1 was mainly expressed in Schwann cells and that BAG1 expression increased in Schwann cells after injury. In vitro, we found that BAG1 expression increased during the cyclic adenosine monophosphate (cAMP)-induced Schwann cell differentiation process. BAG1-specific siRNA inhibited cAMP-induced Schwann cell differentiation. In conclusion, we speculated that BAG1 was upregulated in the sciatic nerve after crush, which was associated with Schwann cell differentiation.
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Affiliation(s)
- Hao Wu
- Department of Orthopaedics, Affiliated Hospital of Nantong University, Nantong University, Nantong, 226001, Jiangsu, People's Republic of China
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11
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Negative Regulators of Schwann Cell Differentiation—Novel Targets for Peripheral Nerve Therapies? J Clin Immunol 2012; 33 Suppl 1:S18-26. [DOI: 10.1007/s10875-012-9786-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 08/27/2012] [Indexed: 01/01/2023]
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12
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Yang J, Cao J, Wang Y, Xu J, Zhou Z, Gu X, Liu X, Wen H, Wu H, Cheng C. Transcription initiation factor IIB involves in Schwann cell differentiation after rat sciatic nerve crush. J Mol Neurosci 2012; 49:491-8. [PMID: 22869340 DOI: 10.1007/s12031-012-9865-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Accepted: 07/23/2012] [Indexed: 12/16/2022]
Abstract
Transcription Initiation Factor IIB (TFIIB), as a general transcription factor, plays an essential role in preinitiation complex assembly and transcription initiation by recruiting RNA polymerase II to the promoter. However, its distribution and function in peripheral system lesion and repair were still unknown. Here, we investigated the spatiotemporal expression of TFIIB in an acute sciatic nerve crush model in adult rats. Western blot analysis revealed that TFIIB was expressed in normal sciatic nerve. It gradually increased, reached a peak at the seventh day after crush, and then returned to the normal level at 4 weeks. We observed that TFIIB expressed mainly increased in Schwann cells and co-localized with Oct-6. In vitro, we induced Schwann cell differentiation with cyclic adenosine monophosphate (cAMP) and found that TFIIB expression was increased in the differentiated process. TFIIB-specific siRNA inhibited cAMP-induced Schwann cell morphological change and the expression of P0. Collectively, we hypothesized peripheral nerve crush-induced upregulation of TFIIB in the sciatic nerve was associated with Schwann cell differentiation.
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Affiliation(s)
- Jiao Yang
- Department of Immunology, Medical College, Nantong University, 19 Qi-Xiu Road, Nantong, Jiangsu Province, 226001, People's Republic of China
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Changes of peroxisome proliferator-activated receptor-γ on crushed rat sciatic nerves and differentiated primary Schwann cells. J Mol Neurosci 2011; 47:380-8. [PMID: 22094441 DOI: 10.1007/s12031-011-9662-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Accepted: 09/30/2011] [Indexed: 12/14/2022]
Abstract
Peroxisome proliferator-activated receptor-γ (PPAR-γ) has been found to play an essential role in cell proliferation, but whether it was involved in Schwann cells differentiation has never been studied. We have found in sciatic nerve injury that expression of PPAR-γ decreases mainly in Schwann cells, and it was also increased in differentiated Schwann cells. Further, activated PPAR-γ by the endogenous ligand 15 d-PGJ(2) increased expressions of PPAR-γ level and Schwann cell differentiation, and this effect may be protected by its antagonist GDW9662. These results indicate that PPAR-γ could promote Schwann cell differentiation, which plays an important role in peripheral nerve injury and regeneration.
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