Nonpeptidergic neurons suppress mast cells via glutamate to maintain skin homeostasis.

Nonpeptidergic neurons suppress mast cells via glutamate to maintain skin homeostasis.
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非肽能神经元通过谷氨酸抑制肥大细胞以维持皮肤稳态。

DOI:
10.1016/j.cell.2021.03.002
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发表时间:
2021-04-15
期刊:
影响因子:
64.5
通讯作者:
Kaplan DH
Kaplan DH
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang S;Edwards TN;Chaudhri VK;Wu J;Cohen JA;Hirai T;Rittenhouse N;Schmitz EG;Zhou PY;McNeil BD;Yang Y;Koerber HR;Sumpter TL;Poholek AC;Davis BM;Albers KM;Singh H;Kaplan DH

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皮肤肥大细胞介导许多皮肤炎症过程,并与感觉传入神经元在解剖学和功能上存在关联。我们发现表达MrgprD的感觉非肽能神经元亚群的表皮神经末梢由于朗格汉斯细胞的缺失而减少。在多种疾病模型中,表皮神经支配的丧失或表达mrgprd的神经元的消融增加了肥大细胞基因模块(包括激活受体Mrgprb2)的表达,导致肥大细胞脱颗粒和皮肤炎症增加。表达mrgprd的神经元的激动作用降低了模块基因的表达并抑制了肥大细胞的反应。表达MrgprD的神经元释放谷氨酸,在MrgprD激动作用下谷氨酸增加。抑制谷氨酸释放或谷氨酸受体结合产生高反应性肥大细胞,其基因组状态与缺乏表达mrgprd神经元的小鼠相似。这些数据表明,表达mrgprd的神经元通过谷氨酸释放抑制肥大细胞的高反应性和皮肤炎症,从而揭示了一种意想不到的维持皮肤免疫稳态的神经免疫机制。
Cutaneous mast cells mediate numerous skin inflammatory processes and have anatomical and functional associations with sensory afferent neurons. We reveal that epidermal nerve endings from a subset of sensory nonpeptidergic neurons expressing MrgprD are reduced by the absence of Langerhans cells. Loss of epidermal innervation or ablation of MrgprD-expressing neurons increased expression of a mast cell gene module including the activating receptor, Mrgprb2, resulting in increased mast cell degranulation and cutaneous inflammation in multiple disease models. Agonism of MrgprD-expressing neurons reduced expression of module genes and suppressed mast cell responses. MrgprD-expressing neurons released glutamate which was increased by MrgprD agonism. Inhibiting glutamate release or glutamate receptor binding yielded hyperresponsive mast cells with a genomic state similar to that in mice lacking MrgprD-expressing neurons. These data demonstrate that MrgprD-expressing neurons suppress mast cell hyperresponsiveness and skin inflammation via glutamate release thereby revealing an unexpected neuro-immune mechanism maintaining cutaneous immune homeostasis.
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