Sexually dimorphic BDNF signaling directs sensory innervation of the mammary gland.

Sexually dimorphic BDNF signaling directs sensory innervation of the mammary gland.
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DOI:
10.1126/science.1228258
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发表时间:
2012-12-07
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ginty DD
Ginty DD
中科院分区:
其他
文献类型:
--
作者:
Liu Y;Rutlin M;Huang S;Barrick CA;Wang F;Jones KR;Tessarollo L;Ginty DD

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在发育过程中,与两性异形器官相关的神经回路是如何差异组装的尚不清楚。本文报道了小鼠乳腺感觉神经支配的性二态性模式及其形成机制。脑源性神经营养因子(BDNF),从乳腺间充质和信号通过其受体TrkB的感觉轴突,是建立乳腺感觉神经支配的性别在早期发育阶段所需的。随后,在男性中,雄激素促进乳腺间充质表达的截断形式的TrkB,这阻止BDNF-TrkB信号传导的感觉轴突,并导致乳腺神经支配的快速损失独立于神经元凋亡。因此,神经营养因子信号的性激素调节指导性二态轴突生长和维持,导致性别特异性神经回路的产生。
How neural circuits associated with sexually dimorphic organs are differentially assembled during development is unclear. Here, we report a sexually dimorphic pattern of mouse mammary gland sensory innervation and the mechanism of its formation. Brain-derived neurotrophic factor (BDNF), emanating from mammary mesenchyme and signaling through its receptor TrkB on sensory axons, is required for establishing mammary gland sensory innervation of both sexes at early developmental stages. Subsequently, in males, androgens promote mammary mesenchymal expression of a truncated form of TrkB, which prevents BDNF-TrkB signaling in sensory axons and leads to a rapid loss of mammary gland innervation independent of neuronal apoptosis. Thus, sex hormone regulation of a neurotrophic factor signal directs sexually dimorphic axonal growth and maintenance, resulting in generation of a sex-specific neural circuit.
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