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- W1991386009 abstract "Expression of the neural adhesion molecule L1 and its potential involvement in axonal sprouting were examined in the deafferented rat dentate gyrus. We focused on the dentate gyrus because of its well-defined cytoarchitecture and well-characterized neuronal degeneration and sprouting response following entorhinal cortex lesions. In the molecular layer of the dentate gyrus, a trilaminar staining pattern was observed, with the middle molecular layer exhibiting slightly denser immunolabeling compared to both inner and outer molecular layers. Two to 12 days after a unilateral entorhinal cortex lesion, a progressive loss of L1 immunolabeling was noted in the ipsilateral middle and outer molecular layers, followed by a substantial reappearance of immunostaining 65 days after lesion incidence. The width of the immunostained ipsilateral inner molecular layer revealed a progressive widening and by postlesion day 65 occupied about 50% of the total width of the molecular layer. Immunoelectron microscopy localized L1 to the surface of unmyelinated axons in both normal and deafferented dentate gyrus. In situ hybridization revealed L1 messenger RNA confined to neurons throughout the hippocampal formation, but did not indicate changes in L1 messenger RNA levels in the hippocampus, dentate gyrus, entorhinal cortex or basal forebrain in response to unilateral entorhinal cortex lesions. Changes in L1 immunolabeling in the deafferented dentate gyrus corresponded in a spatial and temporal manner to changes of the synaptic marker synaptophysin and axonal marker phosphorylated tau. Results of the present study are most consistent with the view that L1 is expressed on reinnervating fibers after they make synaptic contacts with other structures. Thus, L1 appears to be involved in the maturation and stabilization of reinnervating fibers and consequently may play an important role in the repair process of the lesioned adult CNS." @default.
- W1991386009 created "2016-06-24" @default.
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- W1991386009 date "1996-12-01" @default.
- W1991386009 modified "2023-10-10" @default.
- W1991386009 title "Expression of the neural adhesion molecule L1 in the deafferented dentate gyrus" @default.
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- W1991386009 doi "https://doi.org/10.1016/0306-4522(96)00276-x" @default.
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