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大鼠基底外侧杏仁核中锥体细胞的多巴胺能神经支配。

Dopaminergic innervation of pyramidal cells in the rat basolateral amygdala.

作者信息

Muller Jay F, Mascagni Franco, McDonald Alexander J

机构信息

Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, SC 29208, USA.

出版信息

Brain Struct Funct. 2009 Feb;213(3):275-88. doi: 10.1007/s00429-008-0196-y. Epub 2008 Oct 7.

Abstract

Dopaminergic (DA) inputs to the basolateral nuclear complex of the amygdala (BLC) are critical for several important functions, including reward-related learning, drug-stimulus learning, and fear conditioning. Despite the importance of the DA projection to the BLC, very little is known about which neuronal subpopulations are innervated. The present study utilized dual-labeling immunohistochemistry at the electron microscopic level to examine DA inputs to pyramidal cells in the anterior basolateral amygdalar nucleus (BLa) in the rat. DA axon terminals and BLa pyramidal cells were labeled using antibodies to tyrosine hydroxylase (TH) and calcium/calmodulin-dependent protein kinase II (CaMK), respectively. Serial section reconstructions of TH-positive (TH+) terminals were performed to determine the extent to which these axon terminals formed synapses versus non-synaptic appositions in the BLa. Our results demonstrate that at least 77% of TH+ terminals form synapses in the BLa, and that 90% of these synapses are with pyramidal cells. The distal dendritic compartment received the great majority of these synaptic contacts, with CaMK+ distal dendrites and spines receiving one-third and one-half, respectively, of all synaptic inputs to pyramidal cells. Many spines receiving innervation from TH+ terminals also received asymmetrical synaptic inputs from putative excitatory terminals. In addition, TH+ terminals often formed non-synaptic appositions with axon terminals, most of which were putatively excitatory in that they were CaMK+ and/or made asymmetrical synapses. Thus, using CaMK as a marker, the present study demonstrates that pyramidal cells, especially their distal dendritic compartments, are the primary targets of dopaminergic inputs to the basolateral amygdala.

摘要

多巴胺能(DA)输入到杏仁核基底外侧核复合体(BLC)对多种重要功能至关重要,包括与奖赏相关的学习、药物刺激学习和恐惧条件反射。尽管DA投射到BLC很重要,但对于哪些神经元亚群接受其支配却知之甚少。本研究利用电子显微镜水平的双重标记免疫组织化学方法,检测大鼠前基底外侧杏仁核(BLa)中锥体细胞的DA输入。分别使用酪氨酸羟化酶(TH)抗体和钙/钙调蛋白依赖性蛋白激酶II(CaMK)抗体标记DA轴突终末和BLa锥体细胞。对TH阳性(TH+)终末进行连续切片重建,以确定这些轴突终末在BLa中形成突触与非突触并置的程度。我们的结果表明,至少77%的TH+终末在BLa中形成突触,其中90%的突触与锥体细胞形成。远端树突区接受了这些突触联系的绝大多数,CaMK+远端树突和棘分别接受了锥体细胞所有突触输入的三分之一和二分之一。许多接受TH+终末支配的棘也接受了来自假定兴奋性终末的不对称突触输入。此外,TH+终末常与轴突终末形成非突触并置,其中大多数被认为是兴奋性的,因为它们是CaMK+和/或形成不对称突触。因此,本研究以CaMK作为标记物,证明锥体细胞,尤其是其远端树突区,是多巴胺能输入到基底外侧杏仁核的主要靶点。

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