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Synaptic degeneration and remodelling after fast kindling of the olfactory bulb

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Abstract

Kindling of the olfactory bulb using a novel fast protocol (within 24 h) was studied in rats. In target brain regions, the effects of kindling were measured on the concentration of glial fibrillary acidic protein (GFAP) by dot-blot and on the concentrations of neural cell adhesion molecule (NCAM) and the 25 kDa synaptosomal associated protein of the D3 immunoprecipitate (D3(SNAP-25)) by crossed immunoelectrophoresis. Bilateral increases in the levels of GFAP, indicating activation of astrocytes, were detected in primary olfactory cortical projection areas, including the piriform cortex, and also in the basolateral amygdala and dentate gyrus, suggesting that these regions may be functionally altered during the kindling process. In the piriform cortex and dentate gyrus increased NCAM/D3(SNAP-25) ratios found ipsilaterally at seven days after kindling probably reflect an elevated rate of synaptic remodelling. At this time, however, an overall pattern of ipsilateral decreases in the synaptic marker proteins NCAM and D3(SNAP-25) indicated that this remodelling occurred on a background of synaptic degeneration. These results confirm previous studies showing that kindling is associated with synaptic remodelling and neuronal degeneration in the hippocampal formation and extends the area of plasticity to include the piriform cortex which is believed to be central to the kindling process.

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Authors and Affiliations

  1. Laboratory for Experimental Neuropsychiatry, Department of Psychiatry, The National University Hospital: Rigshospitalet-6234, DK-2100, Copenhagen, Denmark

    David P. D. Woldbye, Tom G. Bolwig & Jørn Kragh

  2. Laboratory for Experimental Neuropsychiatry, Department of Pharmacology, University of Copenhagen, Copenhagen, Denmark, Denmark

    Ole Steen Jørgensen

  3. Department of Pharmacology, The National University Hospital: Rigshospitalet-6102, Copenhagen, Denmark

    Ole Steen Jørgensen

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  1. David P. D. Woldbye
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Woldbye, D.P.D., Bolwig, T.G., Kragh, J. et al. Synaptic degeneration and remodelling after fast kindling of the olfactory bulb. Neurochem Res 21, 585–593 (1996). https://doi.org/10.1007/BF02527757

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