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Cui Y, Rolova T, Fagerholm SC. The role of integrins in brain health and neurodegenerative diseases. Eur J Cell Biol 2024; 103:151441. [PMID: 39002282 DOI: 10.1016/j.ejcb.2024.151441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 06/28/2024] [Accepted: 07/02/2024] [Indexed: 07/15/2024] Open
Abstract
Integrins are heterodimeric membrane proteins expressed on the surface of most cells. They mediate adhesion and signaling processes relevant for a wealth of physiological processes, including nervous system development and function. Interestingly, integrins are also recognized therapeutic targets for inflammatory diseases, such as multiple sclerosis. Here, we discuss the role of integrins in brain development and function, as well as in neurodegenerative diseases affecting the brain (Alzheimer's disease, multiple sclerosis, stroke). Furthermore, we discuss therapeutic targeting of these adhesion receptors in inflammatory diseases of the brain.
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Affiliation(s)
- Yunhao Cui
- Molecular and Integrative Biosciences Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki 00790, Finland
| | - Taisia Rolova
- Neuroscience Center, HiLIFE, University of Helsinki, Helsinki 00290, Finland
| | - Susanna C Fagerholm
- Molecular and Integrative Biosciences Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki 00790, Finland.
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Li X, Xu H, Li C, Guan Y, Liu Y, Zhang T, Meng F, Cheng H, Song X, Jia Z, He R, Zhao J, Chen S, Guan C, Yan S, Wang J, Wei Y, Zhang J, Tang J, Peng J, Wang Y. Biological characteristics of tissue engineered-nerve grafts enhancing peripheral nerve regeneration. Stem Cell Res Ther 2024; 15:215. [PMID: 39020413 PMCID: PMC11256578 DOI: 10.1186/s13287-024-03827-9] [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: 04/15/2024] [Accepted: 07/02/2024] [Indexed: 07/19/2024] Open
Abstract
BACKGROUND A favorable regenerative microenvironment is essential for peripheral nerve regeneration. Neural tissue-specific extracellular matrix (ECM) is a natural material that helps direct cell behavior and promote axon regeneration. Both bone marrow-derived mesenchymal stem cells (BMSCs) and adipose-derived mesenchymal stem cells (ADSCs) transplantation are effective in repairing peripheral nerve injury (PNI). However, there is no study that characterizes the in vivo microenvironmental characteristics of these two MSCs for the early repair of PNI when combined with neural tissue-derived ECM materials, i.e., acellular nerve allograft (ANA). METHODS In order to investigate biological characteristics, molecular mechanisms of early stage, and effectiveness of ADSCs- or BMSCs-injected into ANA for repairing PNI in vivo, a rat 10 mm long sciatic nerve defect model was used. We isolated primary BMSCs and ADSCs from bone marrow and adipose tissue, respectively. First, to investigate the in vivo response characteristics and underlying molecular mechanisms of ANA combined with BMSCs or ADSCs, eighty-four rats were randomly divided into three groups: ANA group, ANA+BMSC group, and ANA+ADSC group. We performed flow cytometry, RT-PCR, and immunofluorescence staining up to 4 weeks postoperatively. To further elucidate the underlying molecular mechanisms, changes in long noncoding RNAs (lncRNAs), circular RNAs (circRNAs), microRNAs (miRNAs), and messenger RNAs (mRNAs) were systematically investigated using whole transcriptome sequencing. We then constructed protein-protein interaction networks to find 10 top ranked hub genes among differentially expressed mRNAs. Second, in order to explore the effectiveness of BMSCs and ADSCs on neural tissue-derived ECM materials for repairing PNI, sixty-eight rats were randomized into four groups: ANA group, ANA+BMSC group, ANA+ADSC group, and AUTO group. In the ANA+BMSC and ANA+ADSC groups, ADSCs/BMSCs were equally injected along the long axis of the 10-mm ANA. Then, we performed histological and functional assessments up to 12 weeks postoperatively. RESULTS The results of flow cytometry and RT-PCR showed that ANA combined with BMSCs exhibited more significant immunomodulatory effects, as evidenced by the up-regulation of interleukin (IL)-10, down-regulation of IL-1β and tumor necrosis factor-alpha (TNF-α) expression, promotion of M1-type macrophage polarization to M2-type, and a significant increase in the number of regulatory T cells (Tregs). ANA combined with ADSCs exhibited more pronounced features of pro-myelination and angiogenesis, as evidenced by the up-regulation of myelin-associated protein gene (MBP and MPZ) and angiogenesis-related factors (TGF-β, VEGF). Moreover, differentially expressed genes from whole transcriptome sequencing results further indicated that ANA loaded with BMSCs exhibited notable immunomodulatory effects and ANA loaded with ADSCs was more associated with angiogenesis, axonal growth, and myelin formation. Notably, ANA infused with BMSCs or ADSCs enhanced peripheral nerve regeneration and motor function recovery with no statistically significant differences. CONCLUSIONS This study revealed that both ANA combined with BMSCs and ADSCs enhance peripheral nerve regeneration and motor function recovery, but their biological characteristics (mainly including immunomodulatory effects, pro-vascular regenerative effects, and pro-myelin regenerative effects) and underlying molecular mechanisms in the process of repairing PNI in vivo are different, providing new insights into MSC therapy for peripheral nerve injury and its clinical translation.
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Affiliation(s)
- Xiangling Li
- The Fourth Medical Center of the General Hospital of People's Liberation Army, Beijing, 100853, China
- Department of Rehabilitation, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Hang Xu
- Department of General Surgery, General Hospital, Tianjin Medical University, Tianjin, 300052, China
| | - Chaochao Li
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Yanjun Guan
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Yuli Liu
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Tieyuan Zhang
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
- Shandong University Center for Orthopaedics, Cheeloo College of Medicine, Shandong University, Jinan, 250012, China
| | - Fanqi Meng
- Department of Anesthesiology, Xuanwu Hospital Capital Medical University, Beijing, 100053, China
| | - Haofeng Cheng
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
- School of Medicine, Nankai University, Tianjin, 300071, China
| | - Xiangyu Song
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
- School of Medicine, Hebei North University, Zhangjiakou, 075132, China
| | - Zhibo Jia
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
- School of Medicine, Hebei North University, Zhangjiakou, 075132, China
| | - Ruichao He
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
- School of Medicine, Nankai University, Tianjin, 300071, China
| | - Jinjuan Zhao
- The Fourth Medical Center of the General Hospital of People's Liberation Army, Beijing, 100853, China
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Shengfeng Chen
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Congcong Guan
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
- School of Medicine, Nankai University, Tianjin, 300071, China
| | - Shi Yan
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
- School of Medicine, Nankai University, Tianjin, 300071, China
| | - Jinpeng Wang
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Yu Wei
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Jian Zhang
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China
| | - Jinshu Tang
- The Fourth Medical Center of the General Hospital of People's Liberation Army, Beijing, 100853, China.
| | - Jiang Peng
- The Fourth Medical Center of the General Hospital of People's Liberation Army, Beijing, 100853, China.
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China.
| | - Yu Wang
- The Fourth Medical Center of the General Hospital of People's Liberation Army, Beijing, 100853, China.
- Institute of Orthopedics, Chinese PLA General Hospital, Beijing Key Lab of Regenerative Medicine in Orthopedics, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing, 100853, China.
- Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, 226001, China.
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Dolatyar B, Zeynali B, Shabani I, Parvaneh Tafreshi A. High-efficient serum-free differentiation of trabecular meshwork mesenchymal stem cells into Schwann-like cells on polylactide electrospun nanofibrous scaffolds. Neurosci Lett 2023; 813:137417. [PMID: 37549866 DOI: 10.1016/j.neulet.2023.137417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 07/14/2023] [Accepted: 08/02/2023] [Indexed: 08/09/2023]
Abstract
Cell-based therapies of the peripheral nerve injury (PNI) have provided satisfactory outcomes among which Schwann cells (SCs) are the most reliable candidate to improve repair of the damaged nerve, however, it is difficult to obtain sufficient amount of SCs for clinical applications. Trabecular meshwork-derived mesenchymal stem cells (TM-MSCs) are newly introduced neural crest originated MSCs, which may have a desirable potential for Schwann-like differentiation due to their common lineage. On the other hand, one of the challenges of cell-based therapies is usage of serum containing media which is inappropriate for clinical applications. In the present study, we investigated the differentiation potential of TM-MSCs into Schwann-like cells on polylactide (PLA) nanofibrous scaffolds in the presence or absence of serum. Our results revealed that PLA nanofibers had no negative effects on the cell growth and proliferation of TM-MSCs, and improved Schwann-like differentiation compared with tissue culture plates (TCPs). More importantly, when the cells cultured on the scaffold in the presence of serum-free media (SFM), expression mRNA levels of SC markers (S100B, GAP43, GFAP and SOX10) were significantly increased compared with those of serum-rich groups. Immunostaining of TM-MSCs cultured on serum-free PLA nanofibrous scaffolds also showed significant expression of GAP43, GFAP and SOX10 compared to those of control, indicating the efficient role of SFM in the differentiation of TM-MSCs into SCs lineage. Overall, the findings of this study revealed the differentiation potential of TM-MSCs to SC fate for the first time, and also showed the beneficial effects of SFM and PLA nanofibrous scaffolds as a promising approach for peripheral nerve regeneration.
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Affiliation(s)
- Banafsheh Dolatyar
- Developmental Biology Lab, School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - Bahman Zeynali
- Developmental Biology Lab, School of Biology, College of Science, University of Tehran, Tehran, Iran.
| | - Iman Shabani
- Department of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Azita Parvaneh Tafreshi
- Department of Molecular Medicine, Faculty of Medical Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
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Li S, Wu W, Zhang J, Chen Y, Wu Y, Wang X. Regulation of Schwann cell proliferation and migration via miR-195-5p-induced Crebl2 downregulation upon peripheral nerve damage. Front Cell Neurosci 2023; 17:1173086. [PMID: 37469605 PMCID: PMC10352107 DOI: 10.3389/fncel.2023.1173086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 05/31/2023] [Indexed: 07/21/2023] Open
Abstract
Background Schwann cells acquire a repair phenotype upon peripheral nerve injury (PNI), generating an optimal microenvironment that drives nerve repair. Multiple microRNAs (miRNAs) show differential expression in the damaged peripheral nerve, with critical regulatory functions in Schwann cell features. This study examined the time-dependent expression of miR-195-5p following PNI and demonstrated a marked dysregulation of miR-195-5p in the damaged sciatic nerve. Methods CCK-8 and EdU assays were used to evaluate the effect of miR-195-5 on Schwann cell viability and proliferation. Schwann cell migration was tested using Transwell and wound healing assays. The miR-195-5p agomir injection experiment was used to evaluate the function of miR-195-5p in vivo. The potential regulators and effects of miR-195-5p were identified through bioinformatics evaluation. The relationship between miR-195-5p and its target was tested using double fluorescence reporter gene analysis. Results In Schwann cells, high levels of miR-195-5p decreased viability and proliferation, while suppressed levels had the opposite effects. However, elevated miR-195-5p promoted Schwann cell migration determined by the Transwell and wound healing assays. In vivo injection of miR-195-5p agomir into rat sciatic nerves promote axon elongation after peripheral nerve injury by affecting Schwann cell distribution and myelin preservation. Bioinformatic assessment further revealed potential regulators and effectors for miR-195-5p, which were utilized to build a miR-195-5p-centered competing endogenous RNA network. Furthermore, miR-195-5p directly targeted cAMP response element binding protein-like 2 (Crebl2) mRNA via its 3'-untranslated region (3'-UTR) and downregulated Crebl2. Mechanistically, miR-195-5p modulated Schwann cell functions by repressing Crebl2. Conclusion The above findings suggested a vital role for miR-195-5p/Crebl2 in the regulation of Schwann cell phenotype after sciatic nerve damage, which may contribute to peripheral nerve regeneration.
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Affiliation(s)
- Shiying Li
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu, China
| | - Wenshuang Wu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu, China
| | - Jing Zhang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu, China
| | - Yu Chen
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu, China
| | - Yumeng Wu
- Cancer Research Center Nantong, Affiliated Tumor Hospital of Nantong University, Nantong, Jiangsu, China
| | - Xinghui Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-Innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu, China
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Zhang Y, Niu Y, Weng Q. Ginkgetin promotes proliferation and migration of Schwann cells via PIGF/p38 MAPK signaling pathway. Tissue Cell 2022; 79:101967. [DOI: 10.1016/j.tice.2022.101967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 10/26/2022] [Accepted: 10/29/2022] [Indexed: 11/09/2022]
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Qiao P, Wu W, Wu Y, Wang X. miR-328a-3p modulates the proliferative and migratory abilities of Schwann cells in peripheral nerves. Neurosci Lett 2022; 791:136893. [PMID: 36191794 DOI: 10.1016/j.neulet.2022.136893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 09/21/2022] [Accepted: 09/27/2022] [Indexed: 11/19/2022]
Abstract
MicroRNAs (miRNAs) modulate Schwann cell phenotype. Here miR-328a-3p amounts after peripheral nerve damage were determined in injury stumps of the sciatic nerve in rats administered surgical crush. Quantitative real-time reverse transcription-polymerase chain reaction was performed to assess miR-328a-3p levels 0, 1, 4, 7 and 14 days post-sciatic nerve damage. The results showed miR-328a-3p was upregulated after nerve damage. CCK8 and EdU assays revealed elevated miR-328a-3p amounts suppressed Schwann cell viability and proliferation, respectively. Next, the migratory potential of cells was assessed by the Transwell chamber and wound healing assays. We found elevated miR-328a-3p amounts also suppressed Schwann cell migration. Conversely, low miR-328a-3p amounts promoted Schwann cell migration. The possible miR-328a-3p targets were predicted by bioinformatics. The 15 target genes retrieved provided insights into miR-328a-3p's effects on Schwann cells and expanded the understanding of miR-328a-3p's biological functions in the peripheral nervous system. Collectively, these findings revealed miR-328a-3p's effects on Schwann cells and provided further insights into the functions of miRNAs in peripheral nerves.
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Affiliation(s)
- Pingping Qiao
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu 226001, China
| | - Wenshuang Wu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu 226001, China
| | - Yumeng Wu
- Cancer Research Center Nantong, Affiliated Tumor Hospital of Nantong University, Nantong, Jiangsu 226361, China
| | - Xinghui Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, Nantong, Jiangsu 226001, China.
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Previtali SC. Peripheral Nerve Development and the Pathogenesis of Peripheral Neuropathy: the Sorting Point. Neurotherapeutics 2021; 18:2156-2168. [PMID: 34244926 PMCID: PMC8804061 DOI: 10.1007/s13311-021-01080-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/26/2021] [Indexed: 12/12/2022] Open
Abstract
Nerve development requires a coordinated sequence of events and steps to be accomplished for the generation of functional peripheral nerves to convey sensory and motor signals. Any abnormality during development may result in pathological structure and function of the nerve, which evolves in peripheral neuropathy. In this review, we will briefly describe different steps of nerve development while we will mostly focus on the molecular mechanisms involved in radial sorting of axons, one of these nerve developmental steps. We will summarize current knowledge of molecular pathways so far reported in radial sorting and their possible interactions. Finally, we will describe how disruption of these pathways may result in human neuropathies.
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Affiliation(s)
- Stefano C Previtali
- Neuromuscular Repair Unit, InSpe (Institute of Experimental Neurology) and Division of Neuroscience, IRCCS San Raffaele Scientific Institute, Milan, Italy.
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Weiße J, Rosemann J, Müller L, Kappler M, Eckert AW, Glaß M, Misiak D, Hüttelmaier S, Ballhausen WG, Hatzfeld M, Haemmerle M, Gutschner T. Identification of lymphocyte cell-specific protein-tyrosine kinase (LCK) as a driver for invasion and migration of oral cancer by tumor heterogeneity exploitation. Mol Cancer 2021; 20:88. [PMID: 34116687 PMCID: PMC8194179 DOI: 10.1186/s12943-021-01384-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 05/31/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Cancer metastases are the main cause of lethality. The five-year survival rate for patients diagnosed with advanced stage oral cancer is 30%. Hence, the identification of novel therapeutic targets is an urgent need. However, tumors are comprised of a heterogeneous collection of cells with distinct genetic and molecular profiles that can differentially promote metastasis making therapy development a challenging task. Here, we leveraged intratumoral heterogeneity in order to identify drivers of cancer cell motility that might be druggable targets for anti-metastasis therapy. METHODS We used 2D migration and 3D matrigel-based invasion assays to characterize the invasive heterogeneity among and within four human oral cancer cell lines in vitro. Subsequently, we applied mRNA-sequencing to map the transcriptomes of poorly and strongly invasive subclones as well as primary tumors and matched metastasis. RESULTS We identified SAS cells as a highly invasive oral cancer cell line. Clonal analysis of SAS yielded a panel of 20 subclones with different invasive capacities. Integrative gene expression analysis identified the Lymphocyte cell-specific protein-tyrosine kinase (LCK) as a druggable target gene associated with cancer cell invasion and metastasis. Inhibition of LCK using A-770041 or dasatinib blocked invasion of highly aggressive SAS cells. Interestingly, reduction of LCK activity increased the formation of adherens junctions and induced cell differentiation. CONCLUSION Analysis of invasive heterogeneity led to the discovery of LCK as an important regulator of motility in oral cancer cells. Hence, small molecule mediated inhibition of LCK could be a promising anti-metastasis therapy option for oral cancer patients.
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Affiliation(s)
- Jonas Weiße
- Junior Research Group 'RNA biology and pathogenesis', Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Julia Rosemann
- Junior Research Group 'RNA biology and pathogenesis', Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Lisa Müller
- Institute of Molecular Medicine, Section for Pathobiochemistry, Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Matthias Kappler
- Department of Oral and Maxillofacial Plastic Surgery, Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Alexander W Eckert
- Department of Cranio Maxillofacial Surgery, Paracelsus Medical University, 90471, Nuremberg, Germany
| | - Markus Glaß
- Institute of Molecular Medicine, Section for Molecular Cell Biology, Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Danny Misiak
- Institute of Molecular Medicine, Section for Molecular Cell Biology, Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Stefan Hüttelmaier
- Institute of Molecular Medicine, Section for Molecular Cell Biology, Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Wolfgang G Ballhausen
- Institute of Molecular Medicine, Section for Molecular Oncology, Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Mechthild Hatzfeld
- Institute of Molecular Medicine, Section for Pathobiochemistry, Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany
| | - Monika Haemmerle
- Institute of Pathology, Section for Experimental Pathology, Medical Faculty, Martin Luther University Halle-Wittenberg, 06112, Halle, Germany
| | - Tony Gutschner
- Junior Research Group 'RNA biology and pathogenesis', Faculty of Medicine, Martin Luther University Halle-Wittenberg, 06120, Halle, Germany.
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Integrin α6 mediates the drug resistance of acute lymphoblastic B-cell leukemia. Blood 2021; 136:210-223. [PMID: 32219444 DOI: 10.1182/blood.2019001417] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Accepted: 03/12/2020] [Indexed: 02/06/2023] Open
Abstract
Resistance to multimodal chemotherapy continues to limit the prognosis of acute lymphoblastic leukemia (ALL). This occurs in part through a process called adhesion-mediated drug resistance, which depends on ALL cell adhesion to the stroma through adhesion molecules, including integrins. Integrin α6 has been implicated in minimal residual disease in ALL and in the migration of ALL cells to the central nervous system. However, it has not been evaluated in the context of chemotherapeutic resistance. Here, we show that the anti-human α6-blocking Ab P5G10 induces apoptosis in primary ALL cells in vitro and sensitizes primary ALL cells to chemotherapy or tyrosine kinase inhibition in vitro and in vivo. We further analyzed the underlying mechanism of α6-associated apoptosis using a conditional knockout model of α6 in murine BCR-ABL1+ B-cell ALL cells and showed that α6-deficient ALL cells underwent apoptosis. In vivo deletion of α6 in combination with tyrosine kinase inhibitor (TKI) treatment was more effective in eradicating ALL than treatment with a TKI (nilotinib) alone. Proteomic analysis revealed that α6 deletion in murine ALL was associated with changes in Src signaling, including the upregulation of phosphorylated Lyn (pTyr507) and Fyn (pTyr530). Thus, our data support α6 as a novel therapeutic target for ALL.
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Won SY, Kwon S, Jeong HS, Chung KW, Choi B, Chang JW, Lee JE. Fibulin 5, a human Wharton's jelly-derived mesenchymal stem cells-secreted paracrine factor, attenuates peripheral nervous system myelination defects through the Integrin-RAC1 signaling axis. Stem Cells 2020; 38:1578-1593. [PMID: 33107705 PMCID: PMC7756588 DOI: 10.1002/stem.3287] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/15/2020] [Accepted: 09/22/2020] [Indexed: 04/25/2023]
Abstract
In the peripheral nervous system (PNS), proper development of Schwann cells (SCs) contributing to axonal myelination is critical for neuronal function. Impairments of SCs or neuronal axons give rise to several myelin-related disorders, including dysmyelinating and demyelinating diseases. Pathological mechanisms, however, have been understood at the elementary level and targeted therapeutics has remained undeveloped. Here, we identify Fibulin 5 (FBLN5), an extracellular matrix (ECM) protein, as a key paracrine factor of human Wharton's jelly-derived mesenchymal stem cells (WJ-MSCs) to control the development of SCs. We show that co-culture with WJ-MSCs or treatment of recombinant FBLN5 promotes the proliferation of SCs through ERK activation, whereas FBLN5-depleted WJ-MSCs do not. We further reveal that during myelination of SCs, FBLN5 binds to Integrin and modulates actin remodeling, such as the formation of lamellipodia and filopodia, through RAC1 activity. Finally, we show that FBLN5 effectively restores the myelination defects of SCs in the zebrafish model of Charcot-Marie-Tooth (CMT) type 1, a representative demyelinating disease. Overall, our data propose human WJ-MSCs or FBLN5 protein as a potential treatment for myelin-related diseases, including CMT.
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Affiliation(s)
- So Yeon Won
- Department of Health Sciences and TechnologySamsung Advanced Institute for Health Sciences & Technology, Sungkyunkwan UniversitySeoulSouth Korea
| | - Soojin Kwon
- Stem Cell & Regenerative Medicine Institute, Samsung Medical CenterSeoulSouth Korea
- Stem Cell Institute, ENCell Co. LtdSeoulSouth Korea
| | - Hui Su Jeong
- Department of Health Sciences and TechnologySamsung Advanced Institute for Health Sciences & Technology, Sungkyunkwan UniversitySeoulSouth Korea
| | - Ki Wha Chung
- Department of Biological SciencesKongju National UniversityKongjuSouth Korea
| | - Byung‐Ok Choi
- Department of NeurologySungkyunkwan University School of MedicineSeoulSouth Korea
| | - Jong Wook Chang
- Stem Cell & Regenerative Medicine Institute, Samsung Medical CenterSeoulSouth Korea
- Stem Cell Institute, ENCell Co. LtdSeoulSouth Korea
| | - Ji Eun Lee
- Department of Health Sciences and TechnologySamsung Advanced Institute for Health Sciences & Technology, Sungkyunkwan UniversitySeoulSouth Korea
- Samsung Biomedical Research Institute, Samsung Medical CenterSeoulSouth Korea
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Edgar JR, Ho AK, Laurá M, Horvath R, Reilly MM, Luzio JP, Roberts RC. A dysfunctional endolysosomal pathway common to two sub-types of demyelinating Charcot-Marie-Tooth disease. Acta Neuropathol Commun 2020; 8:165. [PMID: 33059769 PMCID: PMC7559459 DOI: 10.1186/s40478-020-01043-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 09/24/2020] [Indexed: 12/17/2022] Open
Abstract
Autosomal dominant mutations in LITAF are responsible for the rare demyelinating peripheral neuropathy, Charcot-Marie-Tooth disease type 1C (CMT1C). The LITAF protein is expressed in many human cell types and we have investigated the consequences of two different LITAF mutations in primary fibroblasts from CMT1C patients using confocal and electron microscopy. We observed the appearance of vacuolation/enlargement of late endocytic compartments (late endosomes and lysosomes). This vacuolation was also observed after knocking out LITAF from either control human fibroblasts or from the CMT1C patient-derived cells, consistent with it being the result of loss-of-function mutations in the CMT1C fibroblasts. The vacuolation was similar to that previously observed in fibroblasts from CMT4J patients, which have autosomal recessive mutations in FIG4. The FIG4 protein is a component of a phosphoinositide kinase complex that synthesises phosphatidylinositol 3,5-bisphosphate on the limiting membrane of late endosomes. Phosphatidylinositol 3,5-bisphosphate activates the release of lysosomal Ca2+ through the cation channel TRPML1, which is required to maintain the homeostasis of endosomes and lysosomes in mammalian cells. We observed that a small molecule activator of TRPML1, ML-SA1, was able to rescue the vacuolation phenotype of LITAF knockout, FIG4 knockout and CMT1C patient fibroblasts. Our data describe the first cellular phenotype common to two different subtypes of demyelinating CMT and are consistent with LITAF and FIG4 functioning on a common endolysosomal pathway that is required to maintain the homeostasis of late endosomes and lysosomes. Although our experiments were on human fibroblasts, they have implications for our understanding of the molecular pathogenesis and approaches to therapy in two subtypes of demyelinating Charcot-Marie-Tooth disease.
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Affiliation(s)
- James R Edgar
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK.
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QP, UK.
| | - Anita K Ho
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK
- Department of Biology, University of York, York, YO10 5DD, UK
| | - Matilde Laurá
- Centre for Neuromuscular Diseases, UCL, Queen Square Institute of Neurology, University College London, London, WC1N 3BG, UK
| | - Rita Horvath
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, CB2 0PY, UK
| | - Mary M Reilly
- Centre for Neuromuscular Diseases, UCL, Queen Square Institute of Neurology, University College London, London, WC1N 3BG, UK
| | - J Paul Luzio
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK
| | - Rhys C Roberts
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge Biomedical Campus, Cambridge, CB2 0XY, UK.
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, CB2 0PY, UK.
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12
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Ferdoushi A, Li X, Jamaluddin MFB, Hondermarck H. Proteomic Profile of Human Schwann Cells. Proteomics 2019; 20:e1900294. [PMID: 31820567 DOI: 10.1002/pmic.201900294] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/22/2019] [Indexed: 12/29/2022]
Abstract
Schwann cells (SC) are essential for the growth, maintenance, and regeneration of peripheral nerves, but the proteome of normal human SC is poorly defined. Here, a proteomic analysis by LC-MS/MS is performed to define the protein expression profile of primary human SC. A total of 19 557 unique peptides corresponding to 1553 individual proteins are identified. Ingenuity Pathway Analysis (IPA), Gene Ontology (GO), and Database for Annotation, Visualization, and Integrated Discovery (DAVID) are used to assign protein localization and function, and to define enriched pathways. EIF2, mTOR, and integrin signaling are among the most enriched pathways and the most enriched biological function is cell-cell adhesion, which is in agreement with the supportive role of SC in peripheral nerves. In addition, several nociceptors and synaptic proteins are identified and may contribute to the recently discovered role of SC in pain sensation and cancer progression. This proteome analysis of normal human SC constitutes a reference for future molecular explorations of physiological and pathological processes where SC are involved.
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Affiliation(s)
- Aysha Ferdoushi
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, 2308, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, NSW, 2305, Australia
| | - Xiang Li
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, 2308, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, NSW, 2305, Australia
| | - Muhammad Fairuz Bin Jamaluddin
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, 2308, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, NSW, 2305, Australia
| | - Hubert Hondermarck
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, 2308, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, NSW, 2305, Australia
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13
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Beyond TCR Signaling: Emerging Functions of Lck in Cancer and Immunotherapy. Int J Mol Sci 2019; 20:ijms20143500. [PMID: 31315298 PMCID: PMC6679228 DOI: 10.3390/ijms20143500] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/08/2019] [Accepted: 07/12/2019] [Indexed: 01/10/2023] Open
Abstract
In recent years, the lymphocyte-specific protein tyrosine kinase (Lck) has emerged as one of the key molecules regulating T-cell functions. Studies using Lck knock-out mice or Lck-deficient T-cell lines have shown that Lck regulates the initiation of TCR signaling, T-cell development, and T-cell homeostasis. Because of the crucial role of Lck in T-cell responses, strategies have been employed to redirect Lck activity to improve the efficacy of chimeric antigen receptors (CARs) and to potentiate T-cell responses in cancer immunotherapy. In addition to the well-studied role of Lck in T cells, evidence has been accumulated suggesting that Lck is also expressed in the brain and in tumor cells, where it actively takes part in signaling processes regulating cellular functions like proliferation, survival and memory. Therefore, Lck has emerged as a novel druggable target molecule for the treatment of cancer and neuronal diseases. In this review, we will focus on these new functions of Lck.
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14
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Yi S, Liu Q, Wang X, Qian T, Wang H, Zha G, Yu J, Wang P, Gu X, Chu D, Li S. Tau modulates Schwann cell proliferation, migration and differentiation following peripheral nerve injury. J Cell Sci 2019; 132:jcs.222059. [PMID: 30782778 DOI: 10.1242/jcs.222059] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 01/22/2019] [Indexed: 12/14/2022] Open
Abstract
Tau protein (encoded by the gene microtubule-associated protein tau, Mapt) is essential for the assembly and stability of microtubule and the functional maintenance of the nervous system. Tau is highly abundant in neurons and is detectable in astrocytes and oligodendrocytes. However, whether tau is present in Schwann cells, the unique glial cells in the peripheral nervous system, is unclear. Here, we investigated the presence of tau and its coding mRNA, Mapt, in cultured Schwann cells and find that tau is present in these cells. Gene silencing of Mapt promoted Schwann cell proliferation and inhibited Schwann cell migration and differentiation. In vivo application of Mapt siRNA suppressed the migration of Schwann cells after sciatic nerve injury. Consistent with this, Mapt-knockout mice showed elevated proliferation and reduced migration of Schwann cells. Rats injected with Mapt siRNA and Mapt-knockout mice also exhibited impaired myelin and lipid debris clearance. The expression and distribution of the cytoskeleton proteins α-tubulin and F-actin were also disrupted in these animals. These findings demonstrate the existence and biological effects of tau in Schwann cells, and expand our understanding of the function of tau in the nervous system.
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Affiliation(s)
- Sheng Yi
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Qianyan Liu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Xinghui Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Tianmei Qian
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Hongkui Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Guangbin Zha
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Jun Yu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Pan Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Xiaosong Gu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Dandan Chu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
| | - Shiying Li
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China
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15
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Regulation of human glioma cell migration, tumor growth, and stemness gene expression using a Lck targeted inhibitor. Oncogene 2018; 38:1734-1750. [PMID: 30353164 PMCID: PMC6462869 DOI: 10.1038/s41388-018-0546-z] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 10/03/2018] [Accepted: 10/06/2018] [Indexed: 11/28/2022]
Abstract
Migration of human glioma cells (hGCs) within the brain parenchyma makes glioblastoma one of the most aggressive and lethal tumors. Studies of the cellular and molecular mechanisms underlying hGC migration are hindered by the limitations of existing glioma models. Here we developed a dorsal root ganglion axon-oligodendrocyte-hGC co-culture to study in real time the migration and interaction of hGCs with their microenvironment. hGCs interact with myelinated and non-myelinated axons through the formation of pseudopodia. Isolation of pseudopodia-localized polysome-bound RNA reveals transcripts of Lck, Paxillin, Crk-II, and Rac1 that undergo local translation. Inhibition of Lck phosphorylation using a small-molecule inhibitor (Lck-I), blocks the phosphorylation of Paxillin and Crk-II, the formation of pseudopodia and the migration of hGCs. In vivo intraventricular administration of the Lck-I using an orthotopic xenograft glioma model, results in statistically significant inhibition of tumor size and significant down-regulation of Nanog-targeted genes, which are associated with glioblastoma patient survival. Moreover, treatment of human glioma stem cells (hGSCs) with Lck-I, results in significant inhibition of self-renewal and tumor-sphere formation. The involvement of Lck in different levels of glioma malignant progression, such as migration, tumor growth, and regulation of cancer stemness, makes Lck a potentially important therapeutic target for human glioblastomas.
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16
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Velasquez JT, St John JA, Nazareth L, Ekberg JAK. Schwann cell lamellipodia regulate cell-cell interactions and phagocytosis. Mol Cell Neurosci 2018; 88:189-200. [PMID: 29336992 DOI: 10.1016/j.mcn.2018.01.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 01/02/2018] [Accepted: 01/09/2018] [Indexed: 01/06/2023] Open
Abstract
Lamellipodia in Schwann cells (SCs) are crucial for myelination, but their other biological functions remain largely uncharacterised. Two types of lamellipodia exist in SCs: axial lamellipodia at the outermost edge of the cell processes, and radial lamellipodia appearing peripherally along the entire cell. We have previously shown that radial lamellipodia on olfactory glia (olfactory ensheathing cells; OECs) promote cell-cell adhesion, contact-mediated migration and phagocytosis. Here we have investigated whether lamellipodia in SCs have similar roles. Using live-cell imaging, we show that the radial lamellipodia in SCs are highly motile, appear at multiple cellular sites and rapidly move in a wave-like manner. We found that axial and radial lamellipodia had strikingly different roles and are regulated by different intracellular pathways. Axial lamellipodia initiated interactions with other SCs and with neurons by contacting radial lamellipodia on SCs, and budding neurites/axons. Most SC-SC interactions resulted in repulsion, and, lamellipodial activity (unlike in OECs) did not promote contact-mediated migration. We show that lamellipodia are crucial for SC-mediated phagocytosis of both axonal debris and bacteria, and demonstrated that inhibition of lamellipodial activity by blocking the Rho/Rac pathways also inhibits phagocytosis. We also show that heregulin, which induces SC differentiation and maturation, alters lamellipodial behaviour but does not affect phagocytic activity. Overall, the results show that SC lamellipodia are important for cell interactions and phagocytosis.
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Affiliation(s)
- Johana Tello Velasquez
- Griffith Institute for Drug Discovery, 170 Kessels Rd, Griffith University, Nathan, 4111, Queensland, Australia; Clem Jones Centre for Neurobiology and Stem Cell Research, 170 Kessels Rd, Griffith University, Brisbane, 4111, QLD, Australia
| | - James A St John
- Griffith Institute for Drug Discovery, 170 Kessels Rd, Griffith University, Nathan, 4111, Queensland, Australia; Clem Jones Centre for Neurobiology and Stem Cell Research, 170 Kessels Rd, Griffith University, Brisbane, 4111, QLD, Australia; Menzies Health Institute Queensland, Parklands Drive, Griffith University, Southport, 4222, QLD, Australia
| | - Lynn Nazareth
- Griffith Institute for Drug Discovery, 170 Kessels Rd, Griffith University, Nathan, 4111, Queensland, Australia; Menzies Health Institute Queensland, Parklands Drive, Griffith University, Southport, 4222, QLD, Australia
| | - Jenny A K Ekberg
- Griffith Institute for Drug Discovery, 170 Kessels Rd, Griffith University, Nathan, 4111, Queensland, Australia; Menzies Health Institute Queensland, Parklands Drive, Griffith University, Southport, 4222, QLD, Australia.
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17
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Lamm KYB, Johnson ML, Baker Phillips J, Muntifering MB, James JM, Jones HN, Redline RW, Rokas A, Muglia LJ. Inverted formin 2 regulates intracellular trafficking, placentation, and pregnancy outcome. eLife 2018; 7. [PMID: 29309034 PMCID: PMC5758111 DOI: 10.7554/elife.31150] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 12/12/2017] [Indexed: 12/17/2022] Open
Abstract
Healthy pregnancy depends on proper placentation-including proliferation, differentiation, and invasion of trophoblast cells-which, if impaired, causes placental ischemia resulting in intrauterine growth restriction and preeclampsia. Mechanisms regulating trophoblast invasion, however, are unknown. We report that reduction of Inverted formin 2 (INF2) alters intracellular trafficking and significantly impairs invasion in a model of human extravillous trophoblasts. Furthermore, global loss of Inf2 in mice recapitulates maternal and fetal phenotypes of placental insufficiency. Inf2-/- dams have reduced spiral artery numbers and late gestational hypertension with resolution following delivery. Inf2-/- fetuses are growth restricted and demonstrate changes in umbilical artery Doppler consistent with poor placental perfusion and fetal distress. Loss of Inf2 increases fetal vascular density in the placenta and dysregulates trophoblast expression of angiogenic factors. Our data support a critical regulatory role for INF2 in trophoblast invasion-a necessary process for placentation-representing a possible future target for improving placentation and fetal outcomes.
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Affiliation(s)
- Katherine Young Bezold Lamm
- Center for the Prevention of Preterm Birth, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, United States.,Molecular and Developmental Biology Graduate Program, University of Cincinnati College of Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, United States.,Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, United States
| | - Maddison L Johnson
- Department of Biological Sciences, Vanderbilt University, Nashville, United States
| | - Julie Baker Phillips
- Department of Biological Sciences, Vanderbilt University, Nashville, United States
| | - Michael B Muntifering
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, United States
| | - Jeanne M James
- The Heart Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, United States
| | - Helen N Jones
- Molecular and Developmental Biology Graduate Program, University of Cincinnati College of Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, United States
| | - Raymond W Redline
- Department of Pathology, University Hospitals Cleveland Medical Center, Cleveland, United States
| | - Antonis Rokas
- Department of Biological Sciences, Vanderbilt University, Nashville, United States
| | - Louis J Muglia
- Center for the Prevention of Preterm Birth, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, United States.,Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, United States.,Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, United States
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18
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Xue J, Yang J, O’Connor DM, Zhu C, Huo D, Boulis NM, Xia Y. Differentiation of Bone Marrow Stem Cells into Schwann Cells for the Promotion of Neurite Outgrowth on Electrospun Fibers. ACS APPLIED MATERIALS & INTERFACES 2017; 9:12299-12310. [PMID: 28322042 PMCID: PMC5489349 DOI: 10.1021/acsami.7b00882] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Seeding nerve guidance conduits with Schwann cells can improve the outcome of peripheral nerve injury repair. Bone marrow stem cells (BMSCs) represent a good choice of cell source as they can differentiate into Schwann cells under appropriate conditions. In this work, we systematically investigated the differentiation of BMSCs into Schwann cells on scaffolds comprising electrospun fibers. We changed the alignment, diameter, and surface properties of the fibers to optimize the differentiation efficiency. The uniaxial alignment of fibers not only promoted the differentiation of BMSCs into Schwann cells but also dictated the morphology and alignment of the derived cells. Coating the surface of aligned fibers with laminin further enhanced the differentiation and thus increased the secretion of neurotrophins. When co-cultured with PC12 cells or chick dorsal root ganglion, the as-derived Schwann cells were able to promote the outgrowth of neurites from cell bodies and direct their extension along the fibers, demonstrating the positive impacts of both the neurotrophic effect and the morphological contact guidance. This work offers a promising strategy for integrating fiber guidance with stem cell therapy to augment peripheral nerve injury repair.
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Affiliation(s)
- Jiajia Xue
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
| | - Junyu Yang
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
| | - Deirdre M. O’Connor
- Department of Neurosurgery, Emory University, Atlanta, Georgia 30322, United States
| | - Chunlei Zhu
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
| | - Da Huo
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
| | - Nicholas M. Boulis
- Department of Neurosurgery, Emory University, Atlanta, Georgia 30322, United States
| | - Younan Xia
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
- School of Chemistry and Biochemistry, School of Chemical and Biological Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- Corresponding Author:
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19
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Melfi S, Montt Guevara MM, Bonalume V, Ruscica M, Colciago A, Simoncini T, Magnaghi V. Src and phospho-FAK kinases are activated by allopregnanolone promoting Schwann cell motility, morphology and myelination. J Neurochem 2017; 141:165-178. [PMID: 28072455 DOI: 10.1111/jnc.13951] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 12/19/2016] [Accepted: 12/30/2016] [Indexed: 01/11/2023]
Abstract
Schwann cells' (SCs) development and maturation require coordinate and complementary activation of several signals and intracellular pathways. Among factors controlling these processes, the signalling intermediates Src tyrosine kinase and focal adhesion kinase (FAK) are relevant for SCs', participating in regulation of their adhesion, motility and migration. Recently, the progesterone metabolite allopregnanolone (ALLO) was proved to be synthesized by SCs, whereas it acts autocrinally on SCs motility and proliferation, which are crucial processes for nerve development, maturation and regeneration. Herein, we investigate the hypothesis that the molecular mechanisms behind the ALLO's action on SCs involve the signalling intermediates Src and FAK. We first demonstrated that ALLO 10-6 M regulates SCs morphology, motility and myelination, also increasing the internode distance in the in vitro myelination model of neuron/SCs co-culture. ALLO's actions were mediated by the modulation of Src/FAK pathway, since they were counteracted by PP2 10-5 M, a selective inhibitor of Src kinase. Then, we proved that Src/FAK activation in SCs involves GABA-A dependent mechanisms and actin re-arrangements. In conclusion, our findings are the first to corroborate the importance of the neuroactive steroid ALLO in regulating SCs development and maturation via the Src and phospho-FAK signalling activation. Cover Image for this issue: doi: 10.1111/jnc.13795.
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Affiliation(s)
- Simona Melfi
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | | | - Veronica Bonalume
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Massimiliano Ruscica
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Alessandra Colciago
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Tommaso Simoncini
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Valerio Magnaghi
- Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
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20
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Rao SNR, Pearse DD. Regulating Axonal Responses to Injury: The Intersection between Signaling Pathways Involved in Axon Myelination and The Inhibition of Axon Regeneration. Front Mol Neurosci 2016; 9:33. [PMID: 27375427 PMCID: PMC4896923 DOI: 10.3389/fnmol.2016.00033] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 05/02/2016] [Indexed: 01/06/2023] Open
Abstract
Following spinal cord injury (SCI), a multitude of intrinsic and extrinsic factors adversely affect the gene programs that govern the expression of regeneration-associated genes (RAGs) and the production of a diversity of extracellular matrix molecules (ECM). Insufficient RAG expression in the injured neuron and the presence of inhibitory ECM at the lesion, leads to structural alterations in the axon that perturb the growth machinery, or form an extraneous barrier to axonal regeneration, respectively. Here, the role of myelin, both intact and debris, in antagonizing axon regeneration has been the focus of numerous investigations. These studies have employed antagonizing antibodies and knockout animals to examine how the growth cone of the re-growing axon responds to the presence of myelin and myelin-associated inhibitors (MAIs) within the lesion environment and caudal spinal cord. However, less attention has been placed on how the myelination of the axon after SCI, whether by endogenous glia or exogenously implanted glia, may alter axon regeneration. Here, we examine the intersection between intracellular signaling pathways in neurons and glia that are involved in axon myelination and axon growth, to provide greater insight into how interrogating this complex network of molecular interactions may lead to new therapeutics targeting SCI.
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Affiliation(s)
- Sudheendra N R Rao
- The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine Miami, FL, USA
| | - Damien D Pearse
- The Miami Project to Cure Paralysis, University of Miami Miller School of MedicineMiami, FL, USA; The Department of Neurological Surgery, University of Miami Miller School of MedicineMiami, FL, USA; The Neuroscience Program, University of Miami Miller School of MedicineMiami, FL, USA; The Interdisciplinary Stem Cell Institute, University of Miami Miller School of MedicineMiami, FL, USA; Bruce W. Carter Department of Veterans Affairs Medical CenterMiami, FL, USA
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21
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Ness JK, Skiles AA, Yap EH, Fajardo EJ, Fiser A, Tapinos N. Nuc-ErbB3 regulates H3K27me3 levels and HMT activity to establish epigenetic repression during peripheral myelination. Glia 2016; 64:977-92. [PMID: 27017927 PMCID: PMC5021170 DOI: 10.1002/glia.22977] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 02/01/2016] [Indexed: 12/04/2022]
Abstract
Nuc‐ErbB3 an alternative transcript from the ErbB3 locus binds to a specific DNA motif and associates with Schwann cell chromatin. Here we generated a nuc‐ErbB3 knockin mouse that lacks nuc‐ErbB3 expression in the nucleus without affecting the neuregulin‐ErbB3 receptor signaling. Nuc‐ErbB3 knockin mice exhibit hypermyelination and aberrant myelination at the paranodal region. This phenotype is attributed to de‐repression of myelination associated gene transcription following loss of nuc‐ErbB3 and histone H3K27me3 promoter occupancy. Nuc‐ErbB3 knockin mice exhibit reduced association of H3K27me3 with myelination‐associated gene promoters and increased RNA Pol‐II rate of transcription of these genes. In addition, nuc‐ErbB3 directly regulates levels of H3K27me3 in Schwann cells. Nuc‐ErbB3 knockin mice exhibit significant decrease of histone H3K27me3 methyltransferase (HMT) activity and reduced levels of H3K27me3. Collectively, nuc‐ErbB3 is a master transcriptional repressor, which regulates HMT activity to establish a repressive chromatin landscape on promoters of genes during peripheral myelination. GLIA 2016;64:977–992 Nuc‐ErbB3 knock‐in mice exhibit peripheral hypermyelination. Nuc‐ErbB3 regulates total levels of H3K27me3 and HMT activity. Nuc‐ErbB3 induces transcriptional repression of myelination associated genes.
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Affiliation(s)
- Jennifer K Ness
- Molecular Neuroscience and Neurooncology Laboratory, Geisinger Clinic, Danville, Pennsylvania
| | - Amanda A Skiles
- Molecular Neuroscience and Neurooncology Laboratory, Geisinger Clinic, Danville, Pennsylvania
| | - Eng-Hui Yap
- Department of Systems and Computational Biology, Albert Einstein College of Medicine, Bronx, New York
| | - Eduardo J Fajardo
- Department of Systems and Computational Biology, Albert Einstein College of Medicine, Bronx, New York
| | - Andras Fiser
- Department of Systems and Computational Biology, Albert Einstein College of Medicine, Bronx, New York
| | - Nikos Tapinos
- Molecular Neuroscience and Neurooncology Laboratory, Geisinger Clinic, Danville, Pennsylvania
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22
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Stimulating the proliferation, migration and lamellipodia of Schwann cells using low-dose curcumin. Neuroscience 2016; 324:140-50. [PMID: 26955781 DOI: 10.1016/j.neuroscience.2016.02.073] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 02/23/2016] [Accepted: 02/29/2016] [Indexed: 11/24/2022]
Abstract
Transplantation of peripheral glia is being trialled for neural repair therapies, and identification of compounds that enhance the activity of glia is therefore of therapeutic interest. We have previously shown that curcumin potently stimulates the activity of olfactory glia. We have now examined the effect of curcumin on Schwann cell (SC) activities including proliferation, migration and the expression of protein markers. SCs were treated with control media and with different concentrations of curcumin (0.02-20 μM). Cell proliferation was determined by MTS assay and migration changes were determined by single live cell migration tracking. We found that small doses of curcumin (40 nM) dramatically increased the proliferation and migration in SCs within just one day. When compared with olfactory glia, curcumin stimulated SC proliferation more rapidly and at lower concentrations. Curcumin significantly increased the migration of SCs, and also increased the dynamic activity of lamellipodial waves which are essential for SC migration. Expression of the activated form of the MAP kinase p38 (p-p38) was significantly decreased in curcumin-treated SCs. These results show that curcumin's effects on SCs differ remarkably to its effects on olfactory glia, suggesting that subtypes of closely related glia can be differentially stimulated by curcumin. Overall these results demonstrate that the therapeutically beneficial activities of glia can be differentially enhanced by curcumin which could be used to improve outcomes of neural repair therapies.
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Miyamoto Y, Torii T, Takada S, Ohno N, Saitoh Y, Nakamura K, Ito A, Ogata T, Terada N, Tanoue A, Yamauchi J. Involvement of the Tyro3 receptor and its intracellular partner Fyn signaling in Schwann cell myelination. Mol Biol Cell 2015. [PMID: 26224309 PMCID: PMC4591693 DOI: 10.1091/mbc.e14-05-1020] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
During early development of the peripheral nervous system, Schwann cell precursors proliferate, migrate, and differentiate into premyelinating Schwann cells. After birth, Schwann cells envelop neuronal axons with myelin sheaths. Although some molecular mechanisms underlying myelination by Schwann cells have been identified, the whole picture remains unclear. Here we show that signaling through Tyro3 receptor tyrosine kinase and its binding partner, Fyn nonreceptor cytoplasmic tyrosine kinase, is involved in myelination by Schwann cells. Impaired formation of myelin segments is observed in Schwann cell neuronal cultures established from Tyro3-knockout mouse dorsal root ganglia (DRG). Indeed, Tyro3-knockout mice exhibit reduced myelin thickness. By affinity chromatography, Fyn was identified as the binding partner of the Tyro3 intracellular domain, and activity of Fyn is down-regulated in Tyro3-knockout mice, suggesting that Tyro3, acting through Fyn, regulates myelination. Ablating Fyn in mice results in reduced myelin thickness. Decreased myelin formation is observed in cultures established from Fyn-knockout mouse DRG. Furthermore, decreased kinase activity levels and altered expression of myelination-associated transcription factors are observed in these knockout mice. These results suggest the involvement of Tyro3 receptor and its binding partner Fyn in Schwann cell myelination. This constitutes a newly recognized receptor-linked signaling mechanism that can control Schwann cell myelination.
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Affiliation(s)
- Yuki Miyamoto
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Tomohiro Torii
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Shuji Takada
- Department of Systems BioMedicine, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Nobuhiko Ohno
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi 409-3898, Japan
| | - Yurika Saitoh
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi 409-3898, Japan
| | - Kazuaki Nakamura
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Akihito Ito
- Research Center, Nissei Bilis, Koga, Shiga 528-0052, Japan
| | - Toru Ogata
- Department of Rehabilitation for the Movement Functions, National Rehabilitation Center for Persons with Disabilities Research Institute, Tokorozawa, Saitama 359-8555, Japan
| | - Nobuo Terada
- Graduate School of Medicine, Shinshu University, Matsumoto, Nagano 390-8621, Japan
| | - Akito Tanoue
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Junji Yamauchi
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo, Tokyo 113-8510, Japan )
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24
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Abstract
Myelinated nerve fibers are essential for the rapid propagation of action potentials by saltatory conduction. They form as the result of reciprocal interactions between axons and Schwann cells. Extrinsic signals from the axon, and the extracellular matrix, drive Schwann cells to adopt a myelinating fate, whereas myelination reorganizes the axon for its role in conduction and is essential for its integrity. Here, we review our current understanding of the development, molecular organization, and function of myelinating Schwann cells. Recent findings into the extrinsic signals that drive Schwann cell myelination, their cognate receptors, and the downstream intracellular signaling pathways they activate will be described. Together, these studies provide important new insights into how these pathways converge to activate the transcriptional cascade of myelination and remodel the actin cytoskeleton that is critical for morphogenesis of the myelin sheath.
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Affiliation(s)
- James L Salzer
- Department of Neuroscience and Physiology, New York University Neuroscience Institute, New York University School of Medicine, New York, New York 10016
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25
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Chen Q, Zhang Z, Liu J, He Q, Zhou Y, Shao G, Sun X, Cao X, Gong A, Jiang P. A fibrin matrix promotes the differentiation of EMSCs isolated from nasal respiratory mucosa to myelinating phenotypical Schwann-like cells. Mol Cells 2015; 38:221-8. [PMID: 25666351 PMCID: PMC4363721 DOI: 10.14348/molcells.2015.2170] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 10/08/2014] [Accepted: 11/19/2014] [Indexed: 12/16/2022] Open
Abstract
Because Schwann cells perform the triple tasks of myelination, axon guidance and neurotrophin synthesis, they are candidates for cell transplantation that might cure some types of nervous-system degenerative diseases or injuries. However, Schwann cells are difficult to obtain. As another option, ectomesenchymal stem cells (EMSCs) can be easily harvested from the nasal respiratory mucosa. Whether fibrin, an important transplantation vehicle, can improve the differentiation of EMSCs into Schwann-like cells (SLCs) deserves further research. EMSCs were isolated from rat nasal respiratory mucosa and were purified using anti-CD133 magnetic cell sorting. The purified cells strongly expressed HNK-1, nestin, p75(NTR), S-100, and vimentin. Using nuclear staining, the MTT assay and Western blotting analysis of the expression of cell-cycle markers, the proliferation rate of EMSCs on a fibrin matrix was found to be significantly higher than that of cells grown on a plastic surface but insignificantly lower than that of cells grown on fibronectin. Additionally, the EMSCs grown on the fibrin matrix expressed myelination-related molecules, including myelin basic protein (MBP), 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNPase) and galactocerebrosides (GalCer), more strongly than did those grown on fibronectin or a plastic surface. Furthermore, the EMSCs grown on the fibrin matrix synthesized more neurotrophins compared with those grown on fibronectin or a plastic surface. The expression level of integrin in EMSCs grown on fibrin was similar to that of cells grown on fibronectin but was higher than that of cells grown on a plastic surface. These results demonstrated that fibrin not only promoted EMSC proliferation but also the differentiation of EMSCs into the SLCs. Our findings suggested that fibrin has great promise as a cell transplantation vehicle for the treatment of some types of nervous system diseases or injuries.
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Affiliation(s)
- Qian Chen
- Department of Histology and Embryology, School of Medicine, Jiangsu University, Zhenjiang,
China
| | - Zhijian Zhang
- Department of Histology and Embryology, School of Medicine, Jiangsu University, Zhenjiang,
China
| | - Jinbo Liu
- Department of Orthopedics, the Third Affiliated Hospital of Suzhou University, Changzhou,
China
| | - Qinghua He
- School of Pharmacology, Jiangsu University, Zhenjiang,
China
| | - Yuepeng Zhou
- Department of Histology and Embryology, School of Medicine, Jiangsu University, Zhenjiang,
China
| | - Genbao Shao
- Department of Histology and Embryology, School of Medicine, Jiangsu University, Zhenjiang,
China
| | - Xianglan Sun
- Department of Histology and Embryology, School of Medicine, Jiangsu University, Zhenjiang,
China
| | - Xudong Cao
- Department of Chemical Engineering, University of Ottawa, Ottawa, Ontario,
Canada
| | - Aihua Gong
- Department of Histology and Embryology, School of Medicine, Jiangsu University, Zhenjiang,
China
| | - Ping Jiang
- Department of Histology and Embryology, School of Medicine, Jiangsu University, Zhenjiang,
China
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26
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Abstract
Peripheral nerves contain large myelinated and small unmyelinated (Remak) fibers that perform different functions. The choice to myelinate or not is dictated to Schwann cells by the axon itself, based on the amount of neuregulin I-type III exposed on its membrane. Peripheral axons are more important in determining the final myelination fate than central axons, and the implications for this difference in Schwann cells and oligodendrocytes are discussed. Interestingly, this choice is reversible during pathology, accounting for the remarkable plasticity of Schwann cells, and contributing to the regenerative potential of the peripheral nervous system. Radial sorting is the process by which Schwann cells choose larger axons to myelinate during development. This crucial morphogenetic step is a prerequisite for myelination and for differentiation of Remak fibers, and is arrested in human diseases due to mutations in genes coding for extracellular matrix and linkage molecules. In this review we will summarize progresses made in the last years by a flurry of reverse genetic experiments in mice and fish. This work revealed novel molecules that control radial sorting, and contributed unexpected ideas to our understanding of the cellular and molecular mechanisms that control radial sorting of axons.
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Affiliation(s)
- M Laura Feltri
- Hunter James Kelly Research Institute, Departments of Biochemistry & Neurology, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Yannick Poitelon
- Hunter James Kelly Research Institute, Departments of Biochemistry & Neurology, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Stefano Carlo Previtali
- Institute of Experimental Neurology (INSPE), Division of Neuroscience, IRCCS San Raffaele Scientific Institute, Milan, Italy
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27
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Montani L, Buerki-Thurnherr T, de Faria JP, Pereira JA, Dias NG, Fernandes R, Gonçalves AF, Braun A, Benninger Y, Böttcher RT, Costell M, Nave KA, Franklin RJM, Meijer D, Suter U, Relvas JB. Profilin 1 is required for peripheral nervous system myelination. Development 2014; 141:1553-61. [PMID: 24598164 DOI: 10.1242/dev.101840] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Myelination allows rapid saltatory propagation of action potentials along the axon and is an essential prerequisite for the normal functioning of the nervous system. During peripheral nervous system (PNS) development, myelin-forming Schwann cells (SCs) generate radial lamellipodia to sort and ensheath axons. This process requires controlled cytoskeletal remodeling, and we show that SC lamellipodia formation depends on the function of profilin 1 (Pfn1), an actin-binding protein involved in microfilament polymerization. Pfn1 is inhibited upon phosphorylation by ROCK, a downstream effector of the integrin linked kinase pathway. Thus, a dramatic reduction of radial lamellipodia formation is observed in SCs lacking integrin-linked kinase or treated with the Rho/ROCK activator lysophosphatidic acid. Knocking down Pfn1 expression by lentiviral-mediated shRNA delivery impairs SC lamellipodia formation in vitro, suggesting a direct role for this protein in PNS myelination. Indeed, SC-specific gene ablation of Pfn1 in mice led to profound radial sorting and myelination defects, confirming a central role for this protein in PNS development. Our data identify Pfn1 as a key effector of the integrin linked kinase/Rho/ROCK pathway. This pathway, acting in parallel with integrin β1/LCK/Rac1 and their effectors critically regulates SC lamellipodia formation, radial sorting and myelination during peripheral nervous system maturation.
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Affiliation(s)
- Laura Montani
- Instituto de Biologia Molecular e Celular, 4150-180 Porto, Portugal
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