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Cheah M, Cheng Y, Petrova V, Cimpean A, Jendelova P, Swarup V, Woolf CJ, Geschwind DH, Fawcett JW. Integrin-Driven Axon Regeneration in the Spinal Cord Activates a Distinctive CNS Regeneration Program. J Neurosci 2023; 43:4775-4794. [PMID: 37277179 PMCID: PMC10312060 DOI: 10.1523/jneurosci.2076-22.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 04/19/2023] [Accepted: 04/21/2023] [Indexed: 06/07/2023] Open
Abstract
The peripheral branch of sensory dorsal root ganglion (DRG) neurons regenerates readily after injury unlike their central branch in the spinal cord. However, extensive regeneration and reconnection of sensory axons in the spinal cord can be driven by the expression of α9 integrin and its activator kindlin-1 (α9k1), which enable axons to interact with tenascin-C. To elucidate the mechanisms and downstream pathways affected by activated integrin expression and central regeneration, we conducted transcriptomic analyses of adult male rat DRG sensory neurons transduced with α9k1, and controls, with and without axotomy of the central branch. Expression of α9k1 without the central axotomy led to upregulation of a known PNS regeneration program, including many genes associated with peripheral nerve regeneration. Coupling α9k1 treatment with dorsal root axotomy led to extensive central axonal regeneration. In addition to the program upregulated by α9k1 expression, regeneration in the spinal cord led to expression of a distinctive CNS regeneration program, including genes associated with ubiquitination, autophagy, endoplasmic reticulum (ER), trafficking, and signaling. Pharmacological inhibition of these processes blocked the regeneration of axons from DRGs and human iPSC-derived sensory neurons, validating their causal contributions to sensory regeneration. This CNS regeneration-associated program showed little correlation with either embryonic development or PNS regeneration programs. Potential transcriptional drivers of this CNS program coupled to regeneration include Mef2a, Runx3, E2f4, and Yy1. Signaling from integrins primes sensory neurons for regeneration, but their axon growth in the CNS is associated with an additional distinctive program that differs from that involved in PNS regeneration.SIGNIFICANCE STATEMENT Restoration of neurologic function after spinal cord injury has yet to be achieved in human patients. To accomplish this, severed nerve fibers must be made to regenerate. Reconstruction of nerve pathways has not been possible, but recently, a method for stimulating long-distance axon regeneration of sensory fibers in rodents has been developed. This research uses profiling of messenger RNAs in the regenerating sensory neurons to discover which mechanisms are activated. This study shows that the regenerating neurons initiate a novel CNS regeneration program which includes molecular transport, autophagy, ubiquitination, and modulation of the endoplasmic reticulum (ER). The study identifies mechanisms that neurons need to activate to regenerate their nerve fibers.
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Affiliation(s)
- Menghon Cheah
- John van Geest Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0PY, United Kingdom
| | - Yuyan Cheng
- Program in Neurogenetics, Department of Neurology, and Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, California 90095
| | - Veselina Petrova
- Department of Neurobiology, Harvard Medical School; F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, Massachusetts 02115
| | - Anda Cimpean
- Centre for Reconstructive Neuroscience, Institute of Experimental Medicine Czech Academy of Science, Prague, Czech Republic
| | - Pavla Jendelova
- Centre for Reconstructive Neuroscience, Institute of Experimental Medicine Czech Academy of Science, Prague, Czech Republic
| | - Vivek Swarup
- Program in Neurogenetics, Department of Neurology, and Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, California 90095
- Department of Neurobiology and Behavior, University of California, Irvine, California 92697
| | - Clifford J Woolf
- Department of Neurobiology, Harvard Medical School; F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, Massachusetts 02115
| | - Daniel H Geschwind
- Program in Neurogenetics, Department of Neurology, and Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, California 90095
| | - James W Fawcett
- John van Geest Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge CB2 0PY, United Kingdom
- Centre for Reconstructive Neuroscience, Institute of Experimental Medicine Czech Academy of Science, Prague, Czech Republic
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Kashimoto R, Furukawa S, Yamamoto S, Kamei Y, Sakamoto J, Nonaka S, Watanabe TM, Sakamoto T, Sakamoto H, Satoh A. Lattice-patterned collagen fibers and their dynamics in axolotl skin regeneration. iScience 2022; 25:104524. [PMID: 35754731 PMCID: PMC9213773 DOI: 10.1016/j.isci.2022.104524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 05/02/2022] [Accepted: 05/30/2022] [Indexed: 11/25/2022] Open
Abstract
The morphology of collagen-producing cells and the structure of produced collagen in the dermis have not been well-described. This lack of insights has been a serious obstacle in the evaluation of skin regeneration. We succeeded in visualizing collagen-producing cells and produced collagen using the axolotl skin, which is highly transparent. The visualized dermal collagen had a lattice-like structure. The collagen-producing fibroblasts consistently possessed the lattice-patterned filopodia along with the lattice-patterned collagen network. The dynamics of this lattice-like structure were also verified in the skin regeneration process of axolotls, and it was found that the correct lattice-like structure was not reorganized after simple skin wounding but was reorganized in the presence of nerves. These findings are not only fundamental insights in dermatology but also valuable insights into the mechanism of skin regeneration. Dermal collagen synthesized by a single cell was visualized in the axolotl skin Collagen-synthetic cells were visualized and revealed lattice-patterned filopodia Collagen pattern was deformed after simple skin wounding The lattice-patterned collagen was only restorable in the presence of nerves
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Affiliation(s)
- Rena Kashimoto
- Division of Earth, Life, and Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - Saya Furukawa
- Department of Biological Sciences, Faculty of Science, Okayama University, Okayama 700-8530, Japan
| | - Sakiya Yamamoto
- Department of Biological Sciences, Faculty of Science, Okayama University, Okayama 700-8530, Japan
| | - Yasuhiro Kamei
- National Institute for Basic Biology (NIBB), National Institutes for Natural Sciences, Okazaki 444-8585, Japan
| | - Joe Sakamoto
- National Institute for Basic Biology (NIBB), National Institutes for Natural Sciences, Okazaki 444-8585, Japan
| | - Shigenori Nonaka
- National Institute for Basic Biology (NIBB), National Institutes for Natural Sciences, Okazaki 444-8585, Japan
- Exploratory Research Center for Life and Living Systems (ExCELLS), National Institutes for Natural Sciences, Okazaki 444-8585, Japan
| | - Tomonobu M. Watanabe
- Laboratory for Comprehensive Bioimaging, RIKEN Center for Biosystems Dynamics Research (BDR), Kobe 650-0047, Japan
- Department of Stem Cell Biology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima 734-8553, Japan
| | - Tatsuya Sakamoto
- Division of Earth, Life, and Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Ushimado Marine Institute (UMI), Okayama University, Setouchi 701-4303, Japan
| | - Hirotaka Sakamoto
- Division of Earth, Life, and Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
- Ushimado Marine Institute (UMI), Okayama University, Setouchi 701-4303, Japan
| | - Akira Satoh
- Research Core for Interdisciplinary Sciences (RCIS), Okayama University, Okayama 700-8530, Japan
- Corresponding author
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Aztekin C. Tissues and Cell Types of Appendage Regeneration: A Detailed Look at the Wound Epidermis and Its Specialized Forms. Front Physiol 2021; 12:771040. [PMID: 34887777 PMCID: PMC8649801 DOI: 10.3389/fphys.2021.771040] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 10/25/2021] [Indexed: 11/13/2022] Open
Abstract
Therapeutic implementation of human limb regeneration is a daring aim. Studying species that can regrow their lost appendages provides clues on how such a feat can be achieved in mammals. One of the unique features of regeneration-competent species lies in their ability to seal the amputation plane with a scar-free wound epithelium. Subsequently, this wound epithelium advances and becomes a specialized wound epidermis (WE) which is hypothesized to be the essential component of regenerative success. Recently, the WE and specialized WE terminologies have been used interchangeably. However, these tissues were historically separated, and contemporary limb regeneration studies have provided critical new information which allows us to distinguish them. Here, I will summarize tissue-level observations and recently identified cell types of WE and their specialized forms in different regeneration models.
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Affiliation(s)
- Can Aztekin
- Swiss Federal Institute of Technology Lausanne, EPFL, School of Life Sciences, Lausanne, Switzerland
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Li M, Du C, Wang J, Gao Z, Yang X, Chen D, Tong J, Ren L. Morphology and mechanical performance between the skin surface of
Rana dybowskii
and
Bufo gargarizans. BIOSURFACE AND BIOTRIBOLOGY 2021. [DOI: 10.1049/bsb2.12018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Mo Li
- College of Biological and Agricultural Engineering Jilin University Changchun China
- The Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun China
| | - Chunyu Du
- College of Biological and Agricultural Engineering Jilin University Changchun China
- The Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun China
| | - Jili Wang
- School of Mechanical and Aerospace Engineering Jilin University Changchun China
| | - Zibo Gao
- College of Biological and Agricultural Engineering Jilin University Changchun China
- The Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun China
| | - Xiao Yang
- College of Biological and Agricultural Engineering Jilin University Changchun China
- The Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun China
| | - Donghui Chen
- College of Biological and Agricultural Engineering Jilin University Changchun China
- The Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun China
| | - Jin Tong
- College of Biological and Agricultural Engineering Jilin University Changchun China
- The Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun China
| | - Lili Ren
- College of Biological and Agricultural Engineering Jilin University Changchun China
- The Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun China
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Li M, Gao Z, Dai T, Chen D, Tong J, Guo L, Wang C. Comparative research on morphology and mechanical property of integument of Rana dybowskii, Xenopus laevis and Ambystoma mexicanum. J Mech Behav Biomed Mater 2021; 117:104382. [PMID: 33607570 DOI: 10.1016/j.jmbbm.2021.104382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 10/22/2022]
Abstract
Amphibians' integument is a multifunctional organ offering protection from the exterior surroundings and facilitating the physiological change of gas, water and salts with the environment, which is a natural biomaterial with multifunctional features. Interspecies comparison of biomechanical characters and microstructure possibly related to them were performed on the integument of three species of amphibians, two anurans(Rana dybowskii and Xenopus laevis) and one urodeles(Ambystoma mexicanum) using tensile testing and morphological characterization. It was found that the integument of Rana dybowskii and Xenopus laevis was covered by polygonal epidermal cells, while the trunk surface of Ambystoma mexicanum presented irregular microstructure with the lack of keratinization. The integument of Rana dybowskii and Xenopus laevis exhibited good performance on stiffness and strength, which showed quite high mean elastic modulus, 931MPa and 1048MPa,respectively.
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Affiliation(s)
- Mo Li
- College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China; The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China
| | - Zibo Gao
- College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China; The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China
| | - Taidong Dai
- College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China; The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China
| | - Donghui Chen
- College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China; The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China
| | - Jin Tong
- College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China; The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China
| | - Li Guo
- College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China; The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China
| | - Chaofei Wang
- College of Biological and Agricultural Engineering, Jilin University, Changchun, 130025, China; The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun, 130025, China.
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Li N, Bai B, Zhang H, Zhang W, Tang S. Adipose stem cell secretion combined with biomaterials facilitates large-area wound healing. Regen Med 2020; 15:2311-2323. [PMID: 33320721 DOI: 10.2217/rme-2020-0086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Adipose-derived stem cell (ADSC)-based therapeutic strategies are in fast-pace advancement in wound treatment due to their availability and the ability to self-renew, undergo multilineage differentiation and self-renewal. Existing studies have successfully explored ADSCs to facilitate scar-free healing of small wounds, but whether the healing of large-area wounds that exhibit over 50% of skin tissue loss in the entire body could be achieved remains controversial. This study sought to review the mechanism of physiological wound healing, and discuss the roles played by chemokines, biological factors and biomaterial scaffolds. The possibility of applying ADSC-conditioned medium or ADSC-released exosomes as 'off-the-shelf' tissue engineering products, integrated with biomaterial scaffolds to facilitate wound healing, was analyzed.
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Affiliation(s)
- Nan Li
- Institute of Plastic Surgery, Weifang Medical University, No. 4948, Shenglidong Street, Kuiwen District of Weifang City, Shandong Province, PR China
| | - Baoshuai Bai
- Institute of Plastic Surgery, Weifang Medical University, No. 4948, Shenglidong Street, Kuiwen District of Weifang City, Shandong Province, PR China
| | - Hairong Zhang
- Institute of Plastic Surgery, Weifang Medical University, No. 4948, Shenglidong Street, Kuiwen District of Weifang City, Shandong Province, PR China
| | - Wei Zhang
- Institute of Plastic Surgery, Weifang Medical University, No. 4948, Shenglidong Street, Kuiwen District of Weifang City, Shandong Province, PR China
| | - Shengjian Tang
- Institute of Plastic Surgery, Weifang Medical University, No. 4948, Shenglidong Street, Kuiwen District of Weifang City, Shandong Province, PR China
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