Abstract:
:We identify an essential role for the RGD (Arg-Gly-Asp tripeptide) moiety in vivo during adult peripheral neuron regenerative growth. Beyond a peripheral nerve transection there were rises in the fibronectin extracellular matrix, and striking rises in the mRNA and protein expression of integrin subunits sensitive to RGD/fibronectin signalling. Neuron perikarya, axons and Schwann cells all expressed RGD/fibronectin sensitive integrins after injury. To evaluate the significance of RGD/fibronectin-integrin interactions, we infused solutions of a pentapeptide including the RGD motif (sRGD) serially and directly within the milieu of early axon growth across rat sciatic transection injuries. While low dose infusions of sRGD facilitated early axon ingrowth, we encountered inhibition of ingrowth and bridge formation with higher doses of sRGD indicating competitive disruption of RGD/fibronectin-integrin signalling. Fibronectin RGD moieties serve a critical and important role during peripheral axon outgrowth.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Liu WQ,Martinez JA,Durand J,Wildering W,Zochodne DWdoi
10.1016/j.nbd.2008.11.012subject
Has Abstractpub_date
2009-04-01 00:00:00pages
11-22issue
1eissn
0969-9961issn
1095-953Xpii
S0969-9961(08)00284-2journal_volume
34pub_type
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journal_title:Neurobiology of disease
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journal_title:Neurobiology of disease
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