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  • Title: Potential effect of mechano growth factor E-domain peptide on axonal guidance growth in primary cultured cortical neurons of rats.
    Author: Liu M, Niu X, Zhou G, Jia Z, Li P, Fan Y.
    Journal: J Tissue Eng Regen Med; 2018 Jan; 12(1):70-79. PubMed ID: 27863093.
    Abstract:
    Establishing appropriate synaptic connections and plasticity is a critical need in neuronal regeneration and development. Mechano growth factor (MGF) and its C-terminal E-domain peptide with 24 amino acids, MGF-Ct24E, are potential neuroprotective agents. Our preliminary study indicates that Netrin-1 can guide axonal growth and its expression is sensitive to MGF, but how MGF regulates the expression of Netrin-1 and its receptor DCC is still unclear. Here, we investigate the effect of MGF-Ct24E on the expression of Netrin-1 and DCC in primary cultured cortical neurons in vitro and the adult rat brain in vivo. MTT assay shows that MGF-Ct24E can significantly protect primary cortical neurons against nerve injury. There is a significant increase in axonal elongation after MGF-Ct24E treatment at concentrations of 0.5 and 1.0 μg/ml. Real-time polymerase chain reaction assay indicates that MGF-Ct24E can effectively promote the expression of Netrin-1 and DCC in primary cultured cortical neurons. To identify the certain mechanism of MGF-Ct24E on neuronal guidance and growth, adult rats are subjected to intramuscular injection of MGF-Ct24E after traumatic brain injury. Rats injected with MGF-Ct24E start eating and drinking within 14 days, indicating that MGF-Ct24E can promote rehabilitation. HE staining and immunohistochemistry assays of brain section slices reveal that MGF-Ct24E treatment can significantly inhibit the haemorrhage of traumatic brain injury and promote expression of Netrin-1. Further investigation of protein expression by Western blot assay shows that MGF-Ct24E promotes expression of Netrin-1 and DCC after nerve injury. MGF-Ct24E can effectively improve axonal guidance through upregulation of Netrin-1/DCC signalling in neuronal regeneration. Copyright © 2016 John Wiley & Sons, Ltd.
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