Cited by 160Nerve injury and regenerationProteoglycans and glycosaminoglycans researchCell Adhesion Molecules Research

Integrin activation promotes axon growth on inhibitory chondroitin sulfate proteoglycans by enhancing integrin signaling

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Tan, Chin Lik, Kwok, Jessica C. F., Patani, Rickie, ffrench-Constant, Charles, Chandran, Siddharthan, Fawcett, James W.·2011·The Journal of Neuroscience

Abstract

Chondroitin sulfate proteoglycans (CSPGs) are upregulated after CNS lesions, where they inhibit axon regeneration. In order for axon growth and regeneration to occur, surface integrin receptors must interact with surrounding extracellular matrix molecules. We have explored the hypothesis that CSPGs inhibit regeneration by inactivating integrins and that forcing integrins into an active state might overcome this inhibition. Using cultured rat sensory neurons, we show that the CSPG aggrecan inhibits laminin-mediated axon growth by impairing integrin signaling via decreasing phosphorylated FAK (pFAK) and pSrc levels, without affecting surface integrin levels. Forcing integrin activation and signaling by manganese or an activating antibody TS2/16 reversed the inhibitory effect of aggrecan on mixed aggrecan/laminin surfaces, and enhanced axon growth from cultured rat sensory neurons (manganese) and human embryonic stem cell-derived motoneurons (TS2/16). The inhibitory effect of Nogo-A can also be reversed by integrin activation. These results suggest that inhibition by CSPGs can act via inactivation of integrins, and that activation of integrins is a potential method for improving axon regeneration after injury.

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Crossref · 10.1523/jneurosci.0008-11.2011

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Authors
Tan, C. L., Kwok, J. C. F., Patani, R., ffrench-Constant, C., Chandran, S., & Fawcett, J. W.
Affiliations
University of Cambridge (GB)
Venue
The Journal of Neuroscience
Published
2011-04-27
Volume
31
Issue
17
Pages
6289-6295
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2068815747
Cited by
160
References
38
Citations by year
2026: 3 · 2025: 8 · 2024: 1 · 2023: 5 · 2022: 7 · 2021: 12 · 2020: 10 · 2019: 10 · 2018: 16 · 2017: 7 · 2016: 8 · 2015: 13 · 2014: 19 · 2013: 12 · 2012: 19
FWCI
7.94
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
  • UCL Discovery (University College London) (submittedVersion)
  • UEA Digital Repository (University of East Anglia) (submittedVersion)
Funders
  • Wellcome Trust
  • British Heart Foundation (SP/10/003/28287)
  • Motor Neurone Disease Association
  • European Commission
  • Henry Smith Charity
  • John and Lucille Van Geest Foundation
  • Medical Research Council
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Proteoglycans and glycosaminoglycans research
  • Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
Keywords
integrin activation, chondroitin sulfate proteoglycans, axon regeneration, aggrecan, laminin, focal adhesion kinase, Src kinase, Nogo-A, sensory neurons, motor neurons, extracellular matrix, central nervous system injury, integrin signaling
MeSH terms
Animals, Antibodies, Axons, Cells, Cultured, Dose-Response Relationship, Drug, Drug Interactions, Ganglia, Spinal, Gene Expression Regulation, Humans, Male, Manganese, Neural Inhibition, Neurons, Chondroitin Sulfate Proteoglycans, Time Factors, Signal Transduction, Integrins, Rats, Sprague-Dawley, Chondroitin ABC Lyase, Lamins, Rats, Aggrecans

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