Author/Editor		Kulijewicz-Nawrot, Magdalena; Verkhratsky, Alexei; Chvátal, Alexander; Syková, Eva; Rodríguez, José J.
Title		Astrocytic cytoskeletal atrophy in the medial prefrontal cortex of a triple transgenic mouse model of Alzheimer's disease
Type		članek
Vol. and No.		Letnik 221, št. 3
Publication year		2012
Volume		str. 252-262
ISSN		1469-7580 - Journal of anatomy
Language		eng
Abstract		Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by the loss of cognitive functions, reflecting pathological damage to the medial prefrontal cortex (mPFC) as well as to the hippocampus and the entorhinal cortex. Astrocytes maintain the internal homeostasis of the CNS and are fundamentally involved in neuropathological processes, including AD. Here, we analysed the astrocytic cytoskeletal changes within the mPFC of a triple transgenic mouse model of AD (3 x Tg-AD) by measuring the surface area and volume of glial fibrillary acidic protein (GFAP)-positive profiles in relation to the build-up and presence of amyloid-beta (Abeta), and compared the results with those found in non-transgenic control animals at different ages. 3 x Tg-AD animals showed clear astroglial cytoskeletal atrophy, which appeared at an early age (3 months; 33% and 47% decrease in GFAP-positive surface area and volume, respectively) and remained throughout the disease progression at 9, 12 and 18 months old (29% and 36%; 37% and 35%; 43% and 37%, respectively). This atrophy was independent of Abeta accumulation, as only a few GFAP-positive cells were localized around Abeta aggregates, which suggests no direct relationship with Abeta toxicity. Thus, our results indicate that the progressive reduction in astrocytic branching and domain in the mPFC can account for the integrative dysfunction leading to the cognitive deficits and memory disturbances observed in AD.
Keywords		Alzheimer's disease astroglia cognition medial prefrontal cortex plasticity