Abstract
Potential interaction between immune response and axonal regeneration has recently attracted much attention in peripheral nervous system (PNS). Previously, global mRNA expression changes in proximal nerve segments were profiled and merely focused on the differentially change of the key biological processes. To further uncover molecular mechanisms of peripheral nerve regeneration, here we focused on the interaction between immune response and axonal regeneration that associated with specific molecular pathways and interactive networks following sciatic nerve transection. To offer an outline of the specific molecular pathways elaborating axonal regeneration and immune response, and to figure out the molecular interaction between immune response and axonal regeneration post-sciatic nerve transection, we carried out comprehensive approaches, including gene expression profiling plus multi-level bioinformatics analysis and then further experimental validation. Alcam, Nrp1, Nrp2, Rac1, Creb1, and Runx3 were firstly considered as the key or hub genes of the protein-protein interaction (PPI) network in rat models of sciatic nerve transection, which are highly correlated with immune response and axonal regeneration. Our work provide a new way to figure out molecular mechanism of peripheral nerve regeneration and valuable resources to figure out the molecular courses which outline neural injury-induced micro-environmental variation to discover novel therapeutic targets for axonal regeneration.
Highlights
In contrast to the limited regenerative potential of central nervous system (CNS), peripheral nervous system (PNS) owns their capabilities to regenerate autonomously
Peripheral nerve regeneration is accompanied by various complicated molecular pathways and cellular events, which are motivated by amount of differentially expressed genes and significantly changed pathways post-Peripheral nerve injury (PNI)
To further uncover the molecular mechanism of peripheral nerve regeneration, here we focused on the interaction between immune response and axonal regeneration which associated with specific molecular pathways and interactive networks post-sciatic nerve transection
Summary
In contrast to the limited regenerative potential of central nervous system (CNS), peripheral nervous system (PNS) owns their capabilities to regenerate autonomously. Various molecules have been found to play dual or multiple roles in biological processes of immune response and axonal regeneration (Shastri et al, 2013; Xanthos and Sandkuhler, 2014). The success or failure of the regeneration process has been interfered by the interact and overlap mechanisms of nervous and immune system after PNI (Gaudet et al, 2011; Rotshenker, 2011; Shastri et al, 2013; Xanthos and Sandkuhler, 2014). To obtain a global perspective of how these molecules, coupled with the bioprocesses and signaling pathways of immune response and axonal regeneration are deliberately orchestrated to guide the intrinsic regenerative programs post-PNI, more comprehensive investigations are still required
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