Abstract
Pronounced neurodegeneration of hippocampal pyramidal neurons has been shown in Alzheimer’s disease. The aim of this study was to establish an organotypic in vitro model for investigating effects of the amyloid β (Aβ)-peptide on pyramidal neuron degeneration, glial cell activation and tau phosphorylation. Tissue cultures in a quasi-monolayer were obtained using roller-drum incubation of hippocampal slices from neonatal Sprague Dawley rats. Neuronal populations identified included N-methyl-D-aspartate (NMDA-R1) receptor immunoreactive pyramidal neurons, and neurons immunopositive for glutamic acid decarboxylase-65 (GAD65) or gamma amino butyric acid (GABA). Many neurons expressed phosphorylated tau as shown by pS396, AD2 and PHF-tau immunostaining. Astrocytes, microglial cells and macrophages were also identified. The Aβ25–35 peptide formed fibrillar networks within 2 days as demonstrated by electron microscopy. In the presence of the neurotoxic Aβ25–35 peptide, but not Aβ35–25, deposits developed in the tissue that were stainable with Thioflavine T and Congo red and showed the characteristic birefringence of Aβ plaques. Following Aβ25–35 exposure, neurodegenerative cells were observed with Fluoro-Jade B staining. Further characterization of pyramidal neurons immunopositive for NMDA-R1 showed a decrease of cell number in the immediate surrounding of Aβ25–35 deposits in a time- and concentration-dependent fashion. Similar effects on pyramidal neurons were obtained following exposure to the full-length, Aβ1–40 peptide. Also, a loss of neuronal processes was seen with GAD65, but not GABA, immunohistochemistry after exposure to Aβ25–35. Aβ25–35-exposed neurons immunopositive for phospho-tau showed degenerating, bent and often fragmented processes. Astrocytes showed increased GFAP-positive reactivity after Aβ25–35 exposure and formation of large networks of processes. No obvious effect on microglial cells and macrophages could be seen after the Aβ25–35 exposure. The developed in vitro system may constitute a useful tool for screening novel drugs against Aβ-induced alterations of tau and degeneration of hippocampal neurons.
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Acknowledgements
This work was supported by the Swedish Research Council (06537), the Swedish Heart and Lung Foundation, Alzheimerfonden, Gun and Bertil Stohnes stiftelse and Stiftelsen för Gamla Tjänarinnor.
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Johansson, S., Radesäter, AC., Cowburn, R.F. et al. Modelling of amyloid β-peptide induced lesions using roller-drum incubation of hippocampal slice cultures from neonatal rats. Exp Brain Res 168, 11–24 (2006). https://doi.org/10.1007/s00221-005-0069-z
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DOI: https://doi.org/10.1007/s00221-005-0069-z