Heterogenous response to aging of astrocytes in murine Substantia Nigra pars compacta and pars reticulata.

Autor: Bondi H; Laboratory of Neuroplasticity, University of Piemonte Orientale, Novara, Italy; Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy., Chiazza F; Laboratory of Neuroplasticity, University of Piemonte Orientale, Novara, Italy; Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy., Masante I; Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy., Bortolotto V; Laboratory of Neuroplasticity, University of Piemonte Orientale, Novara, Italy; Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy., Canonico PL; Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy., Grilli M; Laboratory of Neuroplasticity, University of Piemonte Orientale, Novara, Italy; Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy. Electronic address: mariagrazia.grilli@uniupo.it.
Jazyk: angličtina
Zdroj: Neurobiology of aging [Neurobiol Aging] 2023 Mar; Vol. 123, pp. 23-34. Date of Electronic Publication: 2022 Dec 29.
DOI: 10.1016/j.neurobiolaging.2022.12.010
Abstrakt: Currently, little is known about the impact of aging on astrocytes in substantia nigra pars compacta (SNpc), where dopaminergic neurons degenerate both in physiological aging and in Parkinson's disease, an age-related neurodegenerative disorder. We performed a morphometric analysis of GFAP + astrocytes in SNpc and, for comparison, in the pars reticulata (SNpr) of young (4-6 months), middle-aged (14-17 months) and old (20-24 months) C57BL/6J male mice. We demonstrated an age-dependent increase of structural complexity only in astrocytes localized in SNpc, and not in SNpr. Astrocytic structural remodelling was not accompanied by changes in GFAP expression, while GFAP increased in SNpr of old compared to young mice. In parallel, transcript levels of selected astrocyte-enriched genes were evaluated. With aging, decreased GLT1 expression occurred only in SNpc, while xCT transcript increased both in SNpc and SNpr, suggesting a potential loss of homeostatic control of extracellular glutamate only in the subregion where age-dependent neurodegeneration occurs. Altogether, our results support an heterogenous morphological and biomolecular response to aging of GFAP + astrocytes in SNpc and SNpr.
(Copyright © 2022. Published by Elsevier Inc.)
Databáze: MEDLINE
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