实验性哮喘时神经生长因子对神经激肽A的上调作用

目的:探讨实验性哮喘时神经生长因子(NGF)对神经激肽A(NKA)的调节机制。方法: 应用放射免疫分析方法检测了NGF缺失时(鼻腔吸入NGF抗体)哮喘豚鼠下呼吸道和内脏感觉传入部位NKA含量的变化。结果:NGF缺失时哮喘豚鼠气管、支气管、肺C₇-T₅段脊神经节及相应节段脊髓后角、结状神经节和孤束核区NKA含量明显低于哮喘组和对照组(P＜0.01)。 结论: 实验性哮喘时NGF可上调下呼吸道和感觉神经节等内脏感觉传入部位的神经激肽A水平,二者可能参与支气管哮喘的发病过程。

Upregulation of neurokinin A levels by nerve growth factor in the experimental asthmatic guinea pig

AIM: To explore the regulatory mechanism of n erve growth factor (NGF) on neurokinin A in the experimental asthmatic guinea pi g. METHODS: Radioimmunoassay was used to determine the alteration of neurokinin A levels in the lower respiratory tract and visceral sensory afferent sites while NGF was absent (inhalation of NGF antibody through nasal cavity) in the asthmatic guinea pig. RESULTS: The contents of neurokinin A in the trachea, bronchus, lung, C 7-T 5 spinal ganglia and the correspondent spinal dorsal horn, nodose ganglia and solitary nucleus area in the experimental asthmatic guinea pig with the absent of NGF in the respiratory tract were much lower than those in the as thmatic and control groups (P<0.01). CONCLUSION: NGF upregulated the contents of neurokinin A in the lower respiratory tract and visceral sensory sites of the experimental asthmatic guinea pig, and both might be involved in the pathogenesis of asthma.