Vagal afferents contribute to exacerbated airway responses following ozone and allergen challenge.

Vagal afferents contribute to exacerbated airway responses following ozone and allergen challenge.
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DOI:
10.1016/j.resp.2012.04.003
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发表时间:
2012-05-31
影响因子:
2.3
通讯作者:
Walby, William F.
Walby, William F.
中科院分区:
医学4区
文献类型:
--
作者:
Schelegle, Edward S.;Walby, William F.

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采用致敏和激发的Brown-挪威大鼠(n=113),观察肺感觉神经在臭氧(O_3)致哮喘中的作用。在第三次挑战之前,大鼠吸入1.0ppm的臭氧8小时。实验分为三组:1)对照组;2)迷走神经周围辣椒素治疗(PCT)加或不加六甲溴铵;3)迷走神经切断术。吸入臭氧导致肺阻力(RL)显著增加,并对随后的过敏原攻击产生夸大的反应。PCT取消了臭氧诱导的RL增加,并显著降低了随后的过敏原刺激引起的RL增加,而六甲溴铵治疗则恢复了过敏原刺激引起的支气管收缩。迷走神经切断术导致吸入臭氧和随后用变应原攻击引起的支气管收缩显著增加。在O3型哮喘加重模型中,迷走神经C纤维启动反射性支气管收缩,迷走神经有髓纤维启动反射性支气管扩张,而气道内释放的介质启动支气管收缩。
Brown-Norway rats (n = 113) sensitized and challenged with nDer f 1 allergen were used to examine the contribution of lung sensory nerves to ozone (O3) exacerbation of asthma. Prior to their third challenge rats inhaled 1.0 ppm O3 for 8 hours. There were three groups: 1) control; 2) vagus perineural capsaicin treatment (PCT) with or without hexamethonium; and 3) vagotomy. O3 inhalation resulted in a significant increase in lung resistance (RL) and an exaggerated response to subsequent allergen challenge. PCT abolished the O3-induced increase in RL and significantly reduced the increase in RL induced by a subsequent allergen challenge, while hexamethonium treatment reestablished bronchoconstriction induced by allergen challenge. Vagotomy resulted in a significant increase in the bronchoconstriction induced by O3 inhalation and subsequent challenge with allergen. In this model of O3 exacerbation of asthma, vagal C-fibers initiate reflex bronchoconstriction, vagal myelinated fibers initiate reflex bronchodilation, and mediators released within the airway initiate bronchoconstriction.
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