The Effect of an NgR1 Antagonist on the Neuroprotection of Cortical Axons After Cortical Infarction in Rats
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Abstract
We investigated the effect of the soluble Nogo66 receptor (sNgR-Fc) on the protection of cortical axons after cortical infarction in rats. The cortical infarction was induced by photothrombotic cortical injury (PCI) in Sprague–Dawley rats, after which sNgR-Fc was injected into the lateral ventricle. The ipsilesional cortices were harvested for analyses using histochemical and transmission-electron microscope techniques. The involved signaling pathways, which include RhoA, JNK, c-JUN and ATF-2, were detected by Western blot. Serious pathologies were found in the brains of the rats after injury, including edemas in the axoplasms of axons that have no medulla sheath and a thickening or shrinkage in the sheath of the axons that have medulla sheathes. However, these pathologies improved after sNgR-Fc treatment. The levels of GTP-RhoA, p-JNK, p–c-JUN and p-ATF-2 in the PCI group were increased when compared with their levels in the sham-operation group (P < 0.05), and animals receiving the sNgR-Fc treatment showed lower expression levels of these proteins when compared with the sham-operation group (P < 0.05). Our results suggest that sNgR-Fc can alleviate the pathological changes of axons following cortical infarction via decreasing the activation of RhoA/JNK signaling pathways.
Keywords
Nogo-66 receptor Axon Cortical infarction Regeneration Signal pathwayNotes
Acknowledgments
This study was supported by funding from the NSFC (81272062, 81071030), Science and Technology Foundation of Guangdong Province, China (2012B031800286, 2010B031600089) and the Fundamental Research Funds for the Central Universities (09ykpy31). The funders had no role in the study design, data collection, analysis, decision to publish or the preparation of the manuscript. Biogen Idec, Inc. provided the sNgR-Fc in the study.
Conflict of interest
The authors indicate no potential conflicts of interest.
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