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Microglial and astroglial reactions to anterograde axonal degeneration: a histochemical and immunocytochemical study of the adult rat fascia dentata after entorhinal perforant path lesions

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Abstract

The reaction of microglial and a stroglial cells to anterograde axonal degeneration was studied in the fascia dentata of adult rats at various timepoints after removal of the entorhinal perforant path projection. Microglial cells were identified by histochemical staining for nucleoside diphosphatase (NDPase) at light and electron microscopical levels. Astroglial cells were stained immunocytochemically for glial fibrillary acidic protein (GFAP). Activated astroglial cells and some microglial cells also stained immunocytochemically for the intermediate filament protein vimentin. Phagocytotic activity was detected by histochemical staining for acid phosphatase. The postlesional connective reorganization of the cholinergic septohippocampal projection was monitored by histochemical staining for acetyl cholinesterase. Twenty-four hours after entorhinal cortex ablation, microglial cells in the perforant path zones of the fascia dentata and the adjacent neuropil reacted by shortening and coarsening of processes and an increase in NDPase reactivity. These changes occurred prior to a noticeable increase in GFAP immunoreactivity and hypertrophy of astroglial cells (first evident on postlesional day 2) or sprouting of cholinergic septohippocampal fibres (first evident on day 3). There was evidence of an early, local proliferation of microglial cells in the denervated perforant path zones and migration into these zones of microglial cells from adjacent intact areas. The specific accumulation of strongly stained microglial cells within the denervated parts of the dentate molecular layer persisted for at least 4 weeks, while the astroglial reaction subsided at 3 weeks. The results demonstrate an early activation of microglial cells by axonal degeneration, and indicate that these cells may play a pivotal, inductive role in the subsequent glial and neural events.

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  1. PharmaBiotec, Institute of Neurobiology, University of Aarhus, DK-8000, Aarhus

    M. B. Jensen

  2. Department of Cell Biology and Physiology, Autonomous University of Barcelona, E-08193, Bellaterra (Barcelona), Spain

    B. Gonzalez & B. Castellano

  3. PharmaBiotec, Department of Anatomy, University of Odense, DK-5000, Odense, Denmark

    M. B. Jensen & J. Zimmer

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Jensen, M.B., Gonzalez, B., Castellano, B. et al. Microglial and astroglial reactions to anterograde axonal degeneration: a histochemical and immunocytochemical study of the adult rat fascia dentata after entorhinal perforant path lesions. Exp Brain Res 98, 245–260 (1994). https://doi.org/10.1007/BF00228413

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