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• W1981342078 abstract "Null mutations in the gene encoding the major myelin protein of the central nervous system, proteolipid protein 1 (PLP1), cause an X-linked form of spastic paraplegia (SPG2) associated with axonal degeneration. While motor symptoms are the best known manifestations of this condition, its somatosensory disturbances have been described but poorly characterized. We carried out a longitudinal study in an animal model of SPG2 - mice carrying a deletion of the Plp1 gene (Plp-null mice). Plp-null mice exhibited severe early-onset thermal hyperalgesia, in the absence of thermal allodynia. We first performed an electrophysiological testing which showed an early decrease in peripheral and spinal conduction velocities in Plp null mice. Such as the abnormal sensitive behaviors, this slowing of nerve conduction was observed before the development of myelin abnormalities at the spinal level, from 3months of age, and without major morphological defects in the sciatic nerve. To understand the link between a decrease in nerve velocity and an increased response to thermal stimuli before the appearance of myelin abnormalities, we focused our attention on the dorsal horn of the spinal cord, the site of integration of somatosensory information. Immunohistochemical studies revealed an early-onset activation of astrocytes and microglia that worsened with age, associated later in age with perturbation of the expression of the sensory neuropeptides calcitonin-gene-related peptide and galanin. Taken together, these results represent complementary data supporting the hypothesis that Plp-null mice suffer from ganglionopathy associated with late onset central demyelination but with few peripheral nerve alterations, induced by the glial-cell-mediated sensitization of the spinal cord. The mechanism suggested here could underlie pain experiments in other leukodystrophies as well as in other non-genetic demyelinating diseases such as multiple sclerosis." @default.
• W1981342078 created "2016-06-24" @default.
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• W1981342078 date "2014-05-01" @default.
• W1981342078 modified "2023-10-18" @default.
• W1981342078 title "Mice with a deletion of the major central myelin protein exhibit hypersensitivity to noxious thermal stimuli: involvement of central sensitization" @default.
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• W1981342078 doi "https://doi.org/10.1016/j.nbd.2014.01.005" @default.
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