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首页> 外文期刊>Neurobiology of Aging: Experimental and Clinical Research >Ca2+ signaling, mitochondria and sensitivity to oxidative stress in aging astrocytes.
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Ca2+ signaling, mitochondria and sensitivity to oxidative stress in aging astrocytes.

机译:Ca2 +信号传导,线粒体和衰老星形胶质细胞对氧化应激的敏感性。

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Age-related changes in astrocytes that could potentially affect neuroprotection have been largely unexplored. To test whether astrocyte function was diminished during the aging process, we examined cell growth, Ca2+ signaling, mitochondrial membrane potential (DeltaPsi) and neuroprotection of NGF-differentiated PC12 cells. We observed that cell growth was significantly slower for astrocytes cultured from old (26-29 months) mice as compared to young (4-6 months) mice. DeltaPsis in old astrocytes were also more depolarized (lower) than in young astrocytes and old astrocytes showed greater sensitivity to the oxidant tert-butyl hydrogen peroxide (t-BuOOH). ATP-induced Ca2+ responses in old astrocytes were consistently larger in amplitude and more frequently oscillatory than in young astrocytes, which may be attributable to lower mitochondrial Ca2+ sequestration. Finally, NGF-differentiated PC12 cells that were co-cultured with old astrocytes were significantly more sensitive to t-BuOOH treatment than co-cultures of NGF-differentiated PC12 cells with young astrocytes. Together, these data demonstrate that astrocyte physiology is significantly altered during the aging process and that the astrocyte's ability to protect neurons is compromised.
机译:星形胶质细胞的与年龄相关的变化可能会影响神经保护作用,目前尚未得到充分的研究。为了测试在老化过程中星形胶质细胞功能是否减弱,我们检查了细胞生长,Ca2 +信号传导,线粒体膜电位(DeltaPsi)和NGF分化PC12细胞的神经保护作用。我们观察到,与年幼(4-6个月)小鼠相比,从年老(26-29个月)小鼠培养的星形胶质细胞的细胞生长显着更慢。老星形胶质细胞中的DeltaPsis也比年轻星形胶质细胞中的去极化更强(较低),老星形胶质细胞对氧化剂叔丁基过氧化氢(t-BuOOH)表现出更高的敏感性。与年轻星形胶质细胞相比,老星形胶质细胞中ATP诱导的Ca2 +反应的幅度始终较大,并且振荡频率更高,这可能是由于线粒体Ca2 +螯合较低。最后,与老的星形胶质细胞共培养的NGF分化的PC12细胞比NGF分化的PC12细胞与年轻的星形胶质细胞共培养对t-BuOOH处理更敏感。总之,这些数据表明,在衰老过程中,星形胶质细胞的生理功能发生了显着变化,并且星形胶质细胞保护神经元的能力受到损害。

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