Effects of essential amino acid deficiency: down-regulation of KCC2 and the GABAA receptor; disinhibition in the anterior piriform cortex.
Effects of essential amino acid deficiency: down-regulation of KCC2 and the GABAA receptor; disinhibition in the anterior piriform cortex.
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DOI:
10.1111/jnc.12403
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发表时间:
2013-11
影响因子:
4.7
通讯作者:
Gietzen DW
中科院分区:
文献类型:
--
作者:
Sharp JW;Ross-Inta CM;Baccelli I;Payne JA;Rudell JB;Gietzen DW
The anterior piriform cortex (APC) is activated by, and is the brain area most sensitive to, essential (indispensable) amino acid (IAA) deficiency. The APC is required for the rapid (20 min) behavioral rejection of IAA deficient diets and increased foraging, both crucial adaptive functions supporting IAA homeostasis in omnivores. The biochemical mechanisms signalling IAA deficiency in the APC block initiation of translation in protein synthesis via uncharged tRNA and the general amino acid control kinase, GCN2. Yet, how inhibition of protein synthesis activates the APC is unknown. The neuronal K+Cl− cotransporter, KCC2, and GABAA receptors are essential inhibitory elements in the APC with short plasmalemmal half-lives that maintain control in this highly excitable circuitry. After a single IAA deficient meal both proteins were reduced (vs basal diet controls) in Western blots of APC (but not neocortex or cerebellum) and in immunohistochemistry of APC. Further, electrophysiological analyses support loss ofinhibitory elements such as the GABAA receptor in this model. As the crucial inhibitory function of the GABAA receptor depends on KCC2 and the Cl− transmembrane gradient it establishes, these results suggest that loss of such inhibitory elements contributes to disinhibition of the APC in IAA deficiency.
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影响因子:
2.5
作者:
HABERLY, LB;PRICE, JL
通讯作者:
PRICE, JL
影响因子:
4.2
作者:
Harris, RA;Joshi, M;Obayashi, M
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影响因子:
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作者:
Koehnle, TJ;Russell, MC;Gietzen, DW
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DOI:
10.1152/ajpregu.1996.271.1.r18
发表时间:
1996-07-01
影响因子:
2.8
作者:
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通讯作者:
Washburn, DS
影响因子:
7.3
作者:
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通讯作者:
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