The functional organization of cutaneous low-threshold mechanosensory neurons.

The functional organization of cutaneous low-threshold mechanosensory neurons.
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DOI:
10.1016/j.cell.2011.11.027
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发表时间:
2011-12-23
期刊:
影响因子:
64.5
通讯作者:
Ginty DD
Ginty DD
中科院分区:
生物学1区
文献类型:
--
作者:
Li L;Rutlin M;Abraira VE;Cassidy C;Kus L;Gong S;Jankowski MP;Luo W;Heintz N;Koerber HR;Woodbury CJ;Ginty DD

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无害的皮肤接触由不同的低阈值机械感受器(LTMR)群体检测到,这些感受器被分类为Aβ -、Aδ -和C - LTMR。在此,我们报道了LTMR亚型的基因标记以及它们在有毛皮肤和脊髓中轴突末梢相对模式的可视化。我们发现躯干有毛皮肤的三种主要毛囊类型——护毛、锥毛/芒毛和锯齿毛,每一种都由独特且不变的LTMR组合所支配;因此,每种毛囊类型都是一个功能上不同的机械感觉终末器官。此外,支配相同或相邻毛囊的Aβ -、Aδ -和C - LTMR的中枢投射在背角形成狭窄的LTMR柱。这些发现支持一种机械感觉模型,在该模型中,Aβ -、Aδ -和C - LTMR的活动在背角LTMR柱内整合,并被处理为构成无数触觉感知基础的输出。
Innocuous touch of the skin is detected by distinct populations of low-threshold mechanoreceptors (LTMRs), which are classified as Aβ-, Aδ- and C-LTMRs. Here, we report genetic labeling of LTMR subtypes and visualization of their relative patterns of axonal endings in hairy skin and the spinal cord. We found that each of the three major hair follicle types of trunk hairy skin; guard, awl/auchene, and zigzag hairs, is innervated by a unique and invariant combination of LTMRs; thus, each hair follicle type is a functionally distinct mechanosensory end organ. Moreover, the central projections of Aβ-, Aδ- and C-LTMRs that innervate the same or adjacent hair follicles form narrow LTMR columns in the dorsal horn. These findings support a model of mechanosensation in which the activities of Aβ-, Aδ- and C-LTMRs are integrated within dorsal horn LTMR columns and processed into outputs that underlie the perception of myriad touch sensations.
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