Opposing roles for E2F1 in survival and death of cerebellar granule neurons
Opposing roles for E2F1 in survival and death of cerebellar granule neurons
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E2F1 在小脑颗粒神经元存活和死亡中的相反作用
DOI:
10.1016/j.neulet.2011.05.045
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发表时间:
2011-07
影响因子:
2.5
通讯作者:
袁忠民
中科院分区:
文献类型:
--
作者:
袁忠民
The transcription factor E2F1 is upregulated when cerebellar granular neurons (CGNs) undergo apoptosis under potassium deprivation. In this study, we examined the effects of E2F1 upregulation on the survival and death of CGNs isolated from C57 mice and Sprague-Dawley (SD) rats. Plasmid- and adenovirus-mediated expression of E2F1 dose-dependently induced apoptosis in mouse CGNs but unexpectedly failed to induce apoptosis in rat CGNs. Caspase 3, a marker for neuronal apoptosis, was significantly activated by ectopic E2F1 expression in mouse CGNs but not in rat CGNs. Furthermore, overexpression of E2F1 significantly promoted apoptotic progression in mouse CGNs following potassium deprivation but attenuated apoptosis in rat CGNs, whereas E2F1 lacking DNA binding ability (E2F1-M132) lost its pro-apoptotic role in mouse CGNs and anti-apoptotic role in rat CGNs. Together, our results demonstrated that upregulation of E2F1 by potassium deprivation promotes apoptosis in C57 mouse CGNs but antagonizes apoptosis in SD rat CGNs, suggesting opposing roles for E2F1 in regulating CGN fate.
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