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• W2057634543 abstract "Exposure to a mixture of As, Pb and Cd induces apoptosis and morphological alterations in the cortical astrocytes of rat brain. The levels of the glial fibrillary acidic protein (GFAP) undergo a reduction. The GFAP exists in several isoforms, viz., α, β, κ, δ and ϵ. However, contribution of the isoforms towards astrocyte damage is not understood. We investigated the effect of the metal mixture (MM) on the expression profiles of mRNAs encoding the GFAP isoforms in astrocytes. The MM was administered in drinking water to developing rats till postnatal day (PD) 60. We observed a fall (10.20 ± 1.04%, 18.91 ± 2.12% and 30.26 ± 3.21% at PD24, PD45 and PD60 respectively) in GFAPα. This may have been compensated by a rise in β, κ, and ϵ. The GFAPδ remained unchanged. To determine the role of the GFAPα, we silenced its gene using SiRNA technology in the rat primary astrocytes. We observed a 23.73 ± 1.56% increase in the number of apoptotic cells. The cleaved PARP and Bax levels increased by 2.48 ± 0.14-fold and 3.73 ± 0.23-fold respectively, and the Bcl-2 and Bcl-xl decreased by 2.38 ± 0.08-fold and 1.76 ± 0.09-fold respectively. The change was comparable to the cells treated with MM. Moreover, silencing the GFAPα gene induced a reduction in the area (6.19 ± 0.18-folds), perimeter (12.65 ± 1.68-folds) and the number of processes (5.88 ± 1.5-folds) in the astrocytes, which closely matched the MM-treated ones. Taken together, these observations are the first to show that MM disturbs the composition of the GFAP isoforms, and a suppressed GFAPα promotes apoptosis in the matured rat astrocytes." @default.
• W2057634543 created "2016-06-24" @default.
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• W2057634543 date "2012-08-18" @default.
• W2057634543 modified "2023-10-14" @default.
• W2057634543 title "Down-regulated GFAPα: a major player in heavy metal induced astrocyte damage" @default.
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• W2057634543 doi "https://doi.org/10.3109/15376516.2012.721809" @default.
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