Genetic marking and characterization of Tac2-expressing neurons in the central and peripheral nervous system.

Genetic marking and characterization of Tac2-expressing neurons in the central and peripheral nervous system.
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DOI:
10.1186/1756-6606-5-3
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发表时间:
2012-01-24
期刊:
影响因子:
3.6
通讯作者:
Ma Q
Ma Q
中科院分区:
医学3区
文献类型:
--
作者:
Mar L;Yang FC;Ma Q

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脊髓背角中处理躯体感觉信息的神经回路仍然知之甚少,原因之一是缺乏Cre系来对背角神经元的选择性亚群进行遗传标记或操作。在这里,我们描述了Tac2-Cre小鼠被产生来表达来自Tac2基因座的Cre重组酶基因。速激肽2(Tac2)编码一种神经递质,神经激肽B(NKB)。通过将Tac2-Cre小鼠与rosa26-td番茄报告鼠杂交,我们直接观察到了Tac2系神经元在背根节、脊髓背角以及大脑的许多部分,包括嗅球、大脑皮层、杏仁核、海马体、缰核、下丘脑和小脑。该Tac2-Cre等位基因本身就是Tac2基因的零等位基因。行为学分析表明,Tac2纯合子缺失小鼠对一系列致过敏(疼痛诱导)和瘙痒(瘙痒诱导)刺激反应正常。TAC2-CRE小鼠是一种有用的工具,可以标记感觉神经节、背侧脊髓和大脑中特定的神经元亚群。这些小鼠还可以用于未来的遗传操作,以研究表达Tac2的神经元的功能或这些神经元表达的基因的功能。
The neurocircuits that process somatic sensory information in the dorsal horn of the spinal cord are still poorly understood, with one reason being the lack of Cre lines for genetically marking or manipulating selective subpopulations of dorsal horn neurons. Here we describe Tac2-Cre mice that were generated to express the Cre recombinase gene from the Tac2 locus. Tachykinin 2 (Tac2) encodes a neurotransmitter, neurokinin B (NKB). By crossing Tac2-Cre mice with ROSA26-tdTomato reporter mice, we directly visualized Tac2 lineage neurons in the dorsal root ganglia, the dorsal horn of the spinal cord, and many parts of the brain including the olfactory bulb, cerebral cortex, amygdala, hippocampus, habenula, hypothalamus, and cerebellum. This Tac2-Cre allele itself was a null allele for the Tac2 gene. Behavioral analyses showed that Tac2 homozygous null mice responded normally to a series of algogenic (pain-inducing) and pruritic (itch-inducing) stimuli. Tac2-Cre mice are a useful tool to mark specific subsets of neurons in the sensory ganglia, the dorsal spinal cord, and the brain. These mice can also be used for future genetic manipulations to study the functions of Tac2-expressing neurons or the functions of genes expressed in these neurons.
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