Calcyon is necessary for activity-dependent AMPA receptor internalization and LTD in CA1 neurons of hippocampus.
Calcyon is necessary for activity-dependent AMPA receptor internalization and LTD in CA1 neurons of hippocampus.
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DOI:
10.1111/j.1460-9568.2008.06563.x
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发表时间:
2009-01
期刊:
影响因子:
--
通讯作者:
Bergson C
中科院分区:
文献类型:
--
作者:
Davidson HT;Xiao J;Dai R;Bergson C
Calcyon is a single transmembrane endocytic protein that regulates clathrin assembly and clathrin mediated endocytosis in brain. Ultrastructural studies indicate that calcyon localizes to spines, but whether it regulates glutamate neurotransmission is not known. Here, we show that deletion of the calcyon gene in mice inhibits agonist stimulated endocytosis of AMPA receptors, without altering basal surface levels of the GluR1 or GluR2 subunits. Whole cell patch clamp studies of hippocampal neurons in culture and CA1 synapses in slices revealed that knockout of calcyon abolishes long term synaptic depression (LTD) whereas mini-analysis in slices indicated basal transmission in hippocampus is unaffected by the deletion. Further, transfection of GFP-tagged calcyon rescued the ability of knockout cultures to undergo LTD. In contrast, intracellular dialysis of a fusion protein containing the clathrin light chain binding domain of calcyon blocked the induction of LTD in wild type hippocampal slices. Taken together, the present studies involving biochemical, immunological and electrophysiological analyses raise the possibility that calcyon plays a specialized role in regulating activity-dependent removal of synaptic AMPA receptors.
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