Abstract
Glial changes were studied in autopsied brains from 10 neurologically normal subjects (4 young to mature and 6 elderly individuals), and 7 Alzheimer’s disease patients. Cortices from hippocampal and parahippocampal regions, as well as temporopolar, insular, and frontal areas, were selected. Single and double immunocytochemical techniques were used, with antibodies recognizing both activated astrocytes and microglia, as well as AßP amyloid and a protein present in neurofibrillary degeneration. Counterstaining with thioflavine-S was also employed to visualize the degree of maturation of senile plaques. Thionin counterstaining allowed to distinguish whether neurofibrillary tangles were extracellular ones. A semi-quantification of medium densities of activated and reactive glial cells was systematically done in all cases. While glial reactivity was found to increase in a moderate way as age advances, it appeared dramatically increased in all Alzheimer’s disease patients, whatever their age. A non-demented individual with abundant senile plaques and neurofibrillary degeneration in hippocampus and parahippocampal cortices, presented an intermediate glial reactivity as compared with that of all of the other controls and the Alzheimer’s disease brains. Activated astrocytes and microglial cells were seen to associate with senile plaques in a direct proportion with the degree of cytotoxicity of every plaque, as demonstrated for the number of neuntes with neurofibrillary degeneration. A highest glial reactivity was also found around extracellular neurofibrillary tangles, as well as related with blood vessels. All of these neuropathological signs eliciting glial reactivity, represent inflammatory focuses, that might become targets for a future treatment of Alzheimer’s disease.
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Morán, M.A., Gómez-Ramos, P. (1998). Glial Changes in Aging and Alzheimer’s Disease. In: Castellano, B., González, B., Nieto-Sampedro, M. (eds) Understanding Glial Cells. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5737-1_19
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