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- W2149219019 abstract "Thy-1 is a membrane glycoprotein suggested to stabilize or inhibit growth of neuronal processes. However, its precise function has remained obscure, because its endogenous ligand is unknown. We previously showed that Thy-1 binds directly to αVβ3 integrin in trans eliciting responses in astrocytes. Nonetheless, whether αVβ3 integrin might also serve as a Thy-1-ligand triggering a neuronal response has not been explored. Thus, utilizing primary neurons and a neuron-derived cell line CAD, Thy-1-mediated effects of αVβ3 integrin on growth and retraction of neuronal processes were tested. In astrocyte-neuron co-cultures, endogenous αVβ3 integrin restricted neurite outgrowth. Likewise, αVβ3-Fc was sufficient to suppress neurite extension in Thy-1(+), but not in Thy-1(−) CAD cells. In differentiating primary neurons exposed to αVβ3-Fc, fewer and shorter dendrites were detected. This effect was abolished by cleavage of Thy-1 from the neuronal surface using phosphoinositide-specific phospholipase C (PI-PLC). Moreover, αVβ3-Fc also induced retraction of already extended Thy-1(+)-axon-like neurites in differentiated CAD cells as well as of axonal terminals in differentiated primary neurons. Axonal retraction occurred when redistribution and clustering of Thy-1 molecules in the plasma membrane was induced by αVβ3 integrin. Binding of αVβ3-Fc was detected in Thy-1 clusters during axon retraction of primary neurons. Moreover, αVβ3-Fc-induced Thy-1 clustering correlated in time and space with redistribution and inactivation of Src kinase. Thus, our data indicates that αVβ3 integrin is a ligand for Thy-1 that upon binding not only restricts the growth of neurites, but also induces retraction of already existing processes by inducing Thy-1 clustering. We propose that these events participate in bi-directional astrocyte-neuron communication relevant to axonal repair after neuronal damage." @default.
- W2149219019 created "2016-06-24" @default.
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- W2149219019 date "2012-03-30" @default.
- W2149219019 modified "2023-09-26" @default.
- W2149219019 title "Astrocytic αVβ3 Integrin Inhibits Neurite Outgrowth and Promotes Retraction of Neuronal Processes by Clustering Thy-1" @default.
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- W2149219019 doi "https://doi.org/10.1371/journal.pone.0034295" @default.
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