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      Peripheral injury of pelvic visceral sensory nerves alters GFRα (GDNF family receptor alpha) localization in sensory and autonomic pathways of the sacral spinal cord

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          Abstract

          GDNF (glial cell line-derived neurotrophic factor), neurturin and artemin use their co-receptors (GFRα1, GFRα2 and GFRα3, respectively) and the tyrosine kinase Ret for downstream signaling. In rodent dorsal root ganglia (DRG) most of the unmyelinated and some myelinated sensory afferents express at least one GFRα. The adult function of these receptors is not completely elucidated but their activity after peripheral nerve injury can facilitate peripheral and central axonal regeneration, recovery of sensation, and sensory hypersensitivity that contributes to pain. Our previous immunohistochemical studies of spinal cord and sciatic nerve injuries in adult rodents have identified characteristic changes in GFRα1, GFRα2 or GFRα3 in central spinal cord axons of sensory neurons located in DRG. Here we extend and contrast this analysis by studying injuries of the pelvic and hypogastric nerves that contain the majority of sensory axons projecting to the pelvic viscera (e.g., bladder and lower bowel). At 7 d, we detected some effects of pelvic but not hypogastric nerve transection on the ipsilateral spinal cord. In sacral (L6-S1) cord ipsilateral to nerve injury, GFRα1-immunoreactivity (IR) was increased in medial dorsal horn and CGRP-IR was decreased in lateral dorsal horn. Pelvic nerve injury also upregulated GFRα1- and GFRα3-IR terminals and GFRα1-IR neuronal cell bodies in the sacral parasympathetic nucleus that provides the spinal parasympathetic preganglionic output to the pelvic nerve. This evidence suggests peripheral axotomy has different effects on somatic and visceral sensory input to the spinal cord, and identifies sensory-autonomic interactions as a possible site of post-injury regulation.

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          Most cited references 47

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          Neuropathic pain: a maladaptive response of the nervous system to damage.

          Neuropathic pain is triggered by lesions to the somatosensory nervous system that alter its structure and function so that pain occurs spontaneously and responses to noxious and innocuous stimuli are pathologically amplified. The pain is an expression of maladaptive plasticity within the nociceptive system, a series of changes that constitute a neural disease state. Multiple alterations distributed widely across the nervous system contribute to complex pain phenotypes. These alterations include ectopic generation of action potentials, facilitation and disinhibition of synaptic transmission, loss of synaptic connectivity and formation of new synaptic circuits, and neuroimmune interactions. Although neural lesions are necessary, they are not sufficient to generate neuropathic pain; genetic polymorphisms, gender, and age all influence the risk of developing persistent pain. Treatment needs to move from merely suppressing symptoms to a disease-modifying strategy aimed at both preventing maladaptive plasticity and reducing intrinsic risk.
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            The GDNF family: signalling, biological functions and therapeutic value.

            Members of the nerve growth factor (NGF) and glial cell line-derived neurotrophic factor (GDNF) families comprising neurotrophins and GDNF-family ligands (GFLs), respectively are crucial for the development and maintenance of distinct sets of central and peripheral neurons. Knockout studies in the mouse have revealed that members of these two families might collaborate or act sequentially in a given neuron. Although neurotrophins and GFLs activate common intracellular signalling pathways through their receptor tyrosine kinases, several clear differences exist between these families of trophic factors.
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              A new definition of neuropathic pain.

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                Author and article information

                Contributors
                Journal
                Front Neuroanat
                Front Neuroanat
                Front. Neuroanat.
                Frontiers in Neuroanatomy
                Frontiers Media S.A.
                1662-5129
                10 April 2015
                2015
                : 9
                Affiliations
                1Pain Management Research Institute (Kolling Institute), University of Sydney at the Royal North Shore Hospital Sydney, NSW, Australia
                2Department of Anatomy and Neuroscience, The University of Melbourne Melbourne, VIC, Australia
                Author notes

                Edited by: Yun-Qing Li, The Fourth Military Medical University, China

                Reviewed by: L. Ashley Blackshaw, University of Adelaide, Australia; David I. Hughes, University of Glasgow, UK

                *Correspondence: Peregrine B. Osborne, Department of Anatomy and Neuroscience, The University of Melbourne, Melbourne, VIC 3010, Australia Tel: +61 3 8344 5769 peregrine.osborne@ 123456unimelb.edu.au

                Present address: Shelley L. Forrest, Discipline of Pathology, University of Sydney, NSW 2006, Australia

                These authors have contributed equally to this work.

                Article
                10.3389/fnana.2015.00043
                4392586
                Copyright © 2015 Forrest, Payne, Keast and Osborne.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                Page count
                Figures: 7, Tables: 1, Equations: 0, References: 47, Pages: 13, Words: 8861
                Categories
                Neuroscience
                Original Research

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