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- W2308588714 abstract "Mutations at the Atrn locus that encodes a transmembrane protein with a large ectodomain are responsible for a juvenile-onset neurodegeneration manifest as hypomyelination and cerebral vacuole development in several rodent species. In addition to a membrane isoform, the human Atm locus generates by alternative splicing a secreted form corresponding to the entire ectodomain that then circulates at high concentration in the periphery, released in part by activated T lymphocytes. We report here that the secreted form mRNA is downregulated throughout representative discrete regions of the human brain while membrane attractin mRNA is well represented, resulting in the apparent absence of secreted attractin protein in cerebrospinal fluid (CSF). Transcription of attractin secreted form mRNA is strongly downregulated upon differentiation of a human cortical neuron-derived cell line (HCN-1A) to a mature neuron phenotype in response to nerve growth factor. Recombinant secreted attractin disrupts neurite formation by differentiated HCN-1A cells, resulting in higher levels of branching with shorter processes. This effect is duplicated by anti-attractin and by human serum but not by human serum depleted of attractin or by CSF We propose that inappropriate expression of secreted attractin in the CNS blocks membrane attractin function and that its presence, either by leakage from the periphery, aberrant transcription, or release from inflammatory foci may affect neuron extracellular interactions leading to neurodegeneration in the human." @default.
- W2308588714 created "2016-06-24" @default.
- W2308588714 creator A5025151403 @default.
- W2308588714 creator A5044619429 @default.
- W2308588714 date "2002-09-01" @default.
- W2308588714 modified "2023-09-23" @default.
- W2308588714 title "Human Secreted Attractin Disrupts Neurite Formation in Differentiating Cortical Neural Cells In Vitro" @default.
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- W2308588714 doi "https://doi.org/10.1093/jnen/61.9.767" @default.
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