Abstract
Thy-1, or CD90, is a glycosylphosphatidylinositol-linked cell surface glycoprotein expressed on multiple cell types, including neurons, thymocytes, fibroblasts, endothelial cells, mesangial cells, and some hematopoietic and stromal stem cells. Thy-1 is developmentally regulated and evolutionarily conserved. Its cellular effects vary between and in some cases within cell types, tissues, and species, indicating that its biological role is context dependent. However, it most often seems to affect cell–cell or cell–matrix interactions and cellular adhesion and migration. In the nervous system, Thy-1 mediates bidirectional cell–cell communication, which modulates cell–matrix adhesion. Neurons express high levels of Thy-1, which interacts with αvβ3 integrin present in astrocytes and stimulates increased astrocyte adhesion to the underlying surface (trans signaling) and in neurites, the same ligand–receptor association triggers neurite retraction and inhibition of axonal growth (cis signaling). Although Thy-1 lacks a cytoplasmic domain, it affects multiple intracellular signaling cascades through interaction with a number of molecules within lipid raft microdomains. Improved understanding of how this enigmatic adhesion molecule modulates signaling and cell phenotype may yield novel insights into neurodevelopment and nerve recovery after injury.
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Acknowledgments
LL is supported by FONDECYT 1110149; Fogarty International Center, National Institutes of Health (NIH), Award Number 5R03TW007810; Iniciativas Científicas Milenio: Biomedical Neuroscience Institute P09-015-F; and Proyecto Anillo ACT 1111. JH is supported by NIH Awards HL082818 and HL111169.
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Leyton, L., Hagood, J.S. (2014). Thy-1 Modulates Neurological Cell–Cell and Cell–Matrix Interactions Through Multiple Molecular Interactions. In: Berezin, V., Walmod, P. (eds) Cell Adhesion Molecules. Advances in Neurobiology, vol 8. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8090-7_1
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