Metabolic control of vesicular glutamate transport and release.

Metabolic control of vesicular glutamate transport and release.
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DOI:
10.1016/j.neuron.2010.09.002
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发表时间:
2010-10-06
期刊:
影响因子:
16.2
通讯作者:
Moriyama, Yoshinori
Moriyama, Yoshinori
中科院分区:
医学1区
文献类型:
--
作者:
Juge, Narinobu;Gray, John A.;Omote, Hiroshi;Miyaji, Takaaki;Inoue, Tsuyoshi;Hara, Chiaki;Uneyama, Hisayuki;Edwards, Robert H.;Nicoll, Roger A.;Moriyama, Yoshinori

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Fasting has been used to control epilepsy since antiquity, but the mechanism of coupling between metabolic state and excitatory neurotransmission remains unknown. Previous work has shown that the vesicular glutamate transporters (VGLUTs) required for exocytotic release of glutamate undergo an unusual form of regulation by Cl−. Using functional reconstitution of the purified VGLUTs into proteoliposomes, we now show that Cl− acts as an allosteric activator, and the ketone bodies that increase with fasting inhibit glutamate release by competing with Cl− at the site of allosteric regulation. Consistent with these observations, acetoacetate reduced quantal size at hippocampal synapses, and suppresses glutamate release and seizures evoked with 4-aminopyridine in the brain. The results indicate an unsuspected link between metabolic state and excitatory neurotransmission through anion-dependent regulation of VGLUT activity.
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