Caspase-3 activation via mitochondria is required for long-term depression and AMPA receptor internalization.

Caspase-3 activation via mitochondria is required for long-term depression and AMPA receptor internalization.
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DOI:
10.1016/j.cell.2010.03.053
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发表时间:
2010-05-28
期刊:
影响因子:
64.5
通讯作者:
Sheng M
Sheng M
中科院分区:
生物学1区
文献类型:
--
作者:
Li Z;Jo J;Jia JM;Lo SC;Whitcomb DJ;Jiao S;Cho K;Sheng M

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NMDA受体依赖性突触修饰,如长时程增强(LTP)和长时程抑制(LTD),对大脑发育和功能至关重要。LTD主要通过从突触后膜去除AMPA受体而发生,但其潜在的分子机制尚不清楚。在这里,我们表明,海马神经元中LTD和AMPA受体内化需要通过线粒体激活caspase-3。LTD和AMPA受体内化被半胱天冬酶-3和-9的肽抑制剂阻断。在caspase-3基因敲除小鼠的海马切片中,LTD被消除,而LTP保持正常。LTD也可以通过抗凋亡蛋白XIAP或Bcl-xL的过度表达以及抗caspase-3蛋白水解的突变体Akt 1蛋白来预防。诱导LTD的NMDA受体刺激瞬时激活树突中的半胱天冬酶-3,而不引起细胞死亡。这些数据表明细胞凋亡的分子机制与LTD之间存在意想不到的因果关系。
NMDA receptor-dependent synaptic modifications, such as long-term potentiation (LTP) and long-term depression (LTD), are essential for brain development and function. LTD occurs mainly by the removal of AMPA receptors from the postsynaptic membrane, but the underlying molecular mechanisms remain unclear. Here we show that activation of caspase-3 via mitochondria is required for LTD and AMPA receptor internalization in hippocampal neurons. LTD and AMPA receptor internalization are blocked by peptide inhibitors of caspase-3 and -9. In hippocampal slices from caspase-3 knockout mice, LTD is abolished whereas LTP remains normal. LTD is also prevented by overexpression of the anti-apoptotic proteins XIAP or Bcl-xL, and by a mutant Akt1 protein that is resistant to caspase-3 proteolysis. NMDA receptor stimulation that induces LTD transiently activates caspase-3 in dendrites, without causing cell death. These data indicate an unexpected causal link between the molecular mechanisms of apoptosis and LTD.
DOI: 10.1074/jbc.273.49.32608
发表时间: 1998-12-04
影响因子: 4.8
作者:
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通讯作者: Thornberry, NA
DOI: 10.1073/pnas.0711647105
发表时间: 2008-02-12
影响因子: 11.1
作者:
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