The cellular and molecular basis of direction selectivity of Aδ-LTMRs.

The cellular and molecular basis of direction selectivity of Aδ-LTMRs.
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DOI:
10.1016/j.cell.2014.11.038
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发表时间:
2014-12-18
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:
Rutlin M;Ho CY;Abraira VE;Cassidy C;Bai L;Woodbury CJ;Ginty DD

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触觉感知(包括刺激穿过皮肤的运动方向)始于激活支配皮肤的低阈值机械感觉神经元 (LTMR)。在这里,我们表明,小鼠 Aδ-LTMR 优先调整为体毛在尾侧到喙侧方向的偏转。这种调谐特性可以通过以下发现来解释:毛囊周围的 Aδ-LTMR 披针形末端是极化的;它们集中在每个毛囊的尾侧(向下)。神经营养因子 BDNF 在毛囊尾侧(而非头侧)的上皮细胞中合成,紧邻表达 TrkB 的 Aδ-LTMR 披针形末端。此外,毛囊上皮细胞中 BDNF 的消融会破坏 Aδ-LTMR 披针形末端的极化,并导致 Aδ-LTMR 对毛发偏转的反应随机化。因此,BDNF-TrkB 信号传导引导 Aδ-LTMR 披针形末端的极化,这是 Aδ-LTMR 对头发偏转的方向选择性响应的基础。
The perception of touch, including the direction of stimulus movement across the skin, begins with activation of low-threshold mechanosensory neurons (LTMRs) that innervate the skin. Here, we show that murine Aδ-LTMRs are preferentially tuned to deflection of body hairs in the caudal-to-rostral direction. This tuning property is explained by the finding that Aδ-LTMR lanceolate endings around hair follicles are polarized; they are concentrated on the caudal (downward) side of each hair follicle. The neurotrophic factor BDNF is synthesized in epithelial cells on the caudal, but not rostral, side of hair follicles, in close proximity to Aδ-LTMR lanceolate endings, which express TrkB. Moreover, ablation of BDNF in hair follicle epithelial cells disrupts polarization of Aδ-LTMR lanceolate endings and results in randomization of Aδ-LTMR responses to hair deflection. Thus, BDNF-TrkB signaling directs polarization of Aδ-LTMR lanceolate endings, which underlies direction-selective responsiveness of Aδ-LTMRs to hair deflection.
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