title: Neurogenic airway inflammation induced by repeated intra-esophageal instillation of HCl in guinea pigs.
abstract: This study was conducted to investigate if repeated intra-esophageal acid administrations may induce neurogenic inflammation in the airways and nodose ganglion in a guinea pig model. Guinea pigs were sedated and perfused with 0.1 N HCl in the distal esophagus via a nasoesophageal catheter for 14 consecutive days. Substance P (SP), neurokinin A (NKA), neurokinin B (NKB), and calcitonin gene-related peptide concentration were measured by ELISA or radioimmunoassay. Neuropeptide expression in the airways and nodose ganglion was detected by immunohistochemistry and assessed semi-quantitatively. Inflammation was found in the trachea and bronchi. There was a threefold increase in substance P concentration in the trachea, main bronchi, and lung homogenate and a twofold increase in NKA and NKB concentration in the main bronchi, lung homogenate, and bronchial alveolus lavage fluid, respectively. The SP and NKA expressions in the airways and nodose ganglion were also significantly increased. Chronic intra-esophageal acid instillation induces significant neurogenic inflammation in the airways and nodose ganglion in the vagus nerve in guinea pigs.
authors.affiliation: State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, First Affiliated Hospital of Guangzhou Medical College, 151 Yanjiang Rd., Guangzhou, 510120, China.
authors.forename: Chunli
authors.initials: C
authors.lastname: Liu
authors.forename: Ruchong
authors.initials: R
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Luo
authors.forename: Kefang
authors.initials: K
authors.lastname: Lai
authors.forename: Nanshan
authors.initials: N
authors.lastname: Zhong
mesh_terms: D000818:Animals; D001980:Bronchi / Q000276:immunology / Q000473:pathology; D001992:Bronchoalveolar Lavage Fluid; D015740:Calcitonin Gene-Related Peptide / Q000032:analysis; D004947:Esophagus / Q000276:immunology; D006168:Guinea Pigs; D006851:Hydrochloric Acid / Q000008:administration & dosage; D008168:Lung; D020078:Neurogenic Inflammation / Q000139:chemically induced / Q000276:immunology*; D015288:Neurokinin A / Q000032:analysis; D015287:Neurokinin B / Q000032:analysis; D009479:Neuropeptides / Q000032:analysis / Q000096:biosynthesis; D009620:Nodose Ganglion / Q000276:immunology* / Q000473:pathology; D011014:Pneumonia / Q000139:chemically induced / Q000276:immunology*; D012137:Respiratory System / Q000276:immunology* / Q000473:pathology; D013373:Substance P / Q000032:analysis; D014132:Trachea / Q000276:immunology / Q000473:pathology
chemical_list: D009479:Neuropeptides; D013373:Substance P; D015288:Neurokinin A; D015287:Neurokinin B; D015740:Calcitonin Gene-Related Peptide; D006851:Hydrochloric Acid