科研之友
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摘要
Apoptosis signal-regulating kinase 1-interacting (ASK1-interacting) protein-1 (AIP1) is a newly identified novel member of the Ras GTPase-activating protein family, which has been implicated in cell growth inhibition and cell apoptosis. However, the effects of AIP1 in Alzheimer's disease (AD) are unknown. In the present study, we found that AIP1 was elevated in the brain of AD Tg2576 mice and A beta 1-42 treated brain cerebral microvascular endothelial cells (CECs). A beta 1-42 treatment induced the interaction of AIP1 and apoptosis signal-regulating kinase 1 (ASK1), which led to dissociation of ASK1 and its inhibitor 14-3-3. Dissociation of ASK1 from 14-3-3 leads to ASK1 activation. Indeed, A beta 1-42 dephosphorylated ASK1 at Ser-967, suggesting that A beta 1-42 increased ASK1 activity. Importantly, disassociation of ASK1 and 14-3-3 induced by A beta 1-42 could be rescued by silence of AIP1. In addition, down-regulation of AIP1 also led to attenuation of the activation of JNK, as well as p53, downstream signaling targets of ASK1. AIP1 silencing attenuated the pro-apoptotic effects of A beta 1-42 on CECs. We propose that AIP1 mediates A beta induced ASK1 activation by facilitating dissociation of 14-3-3, suggesting a novel mechanism for A beta-induced apoptosis in CECs.
- 出版日期2015-1
