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[Effect of integrin β8 on TGF-β1 activation in astrocytes with oxygen glucose deprivation].

Zhongguo Dang Dai Er Ke Za Zhi. 2014 Jan;16(1):73-6
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摘要


OBJECTIVE:To study the effect of β8 expression on transforming growth factor β1(TGF-β1) activation in astrocytes with oxygen glucose deprivation (OGD). METHODS:Astrocytes were cultured and then subjected to OGD to generate hypoxia-ischemia (HI) model in vitro. Immunocytochemistry was used to detect the expression and distribution of β8 in nomoxia cultured cells. β8 protein expression was quantified by Western blot at 12 hours, 1 day and 2 days after OGD. Astrocytes and luciferase reporter cells (TMLC) were co-cultured. β8 RNA interference system was established to specifically inhibit β8 expression in cultured astrocytes. TGF-β1 activation was then detected in the co-culture system. RESULTS:β8 was mainly located in the cytoplasm and neurites of astrocytes. OGD resulted in increase of β8 protein expression at 12 hours after reoxygenation in astrocytes, which was peaked at 1 day after reoxygenation. TGF-β1 activation was in accordance with β8 expression in astrocyte-TMLC co-culture system after reoxygenation. After the inhibition of β8, TGF-β1 activation was significantly reduced in all time points. CONCLUSIONS:The highly expressed β8 plays important roles in the regulation of TGF-β1 activation in neonatal rats with hypoxic-ischemic brain damage.

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