Endobronchial injection of botulinum toxin for the reduction of bronchial hyperreactivity induced by methacholine inhalation in dogs.

Journal Article

BACKGROUND: Airway smooth muscle contraction causes bronchial constriction and is the main cause of bronchospasm in response to stimulants in asthma patients. In this pilot study, we tested the possibility of using a commercially available neurotoxin-botulinum toxin A (BTX-A)-to reduce bronchial hyperreactivity in dogs. METHODS: Two bronchoscopic sessions were conducted in 6 healthy mongrel dogs. In the first session, BTX-A (concentration 10 U/mL) was injected in small aliquots submucosally in 1 caudal lobe and its subsegments, leaving the other side as control. During the second bronchoscopy conducted 2 weeks later, the airway calibers of the treated and untreated sides were measured in each animal before and after instillation of methacholine in the airways to induce bronchial hyperreactivity (concentration 25 mg/mL). RESULTS: The mean pretreatment diameter was 3.356 (± 1.294) mm and 2.765 (± 0.603) mm in the treated and untreated airways, respectively. After provocation with methacholine, the diameter of the treated airways was 1.985 (± 0.888) mm versus 0.873 (± 0.833) mm in the untreated airways (P=0.000). Local injection of BTX-A in the airway resulted in reduction of bronchial hyperreactivity by 58.6% (P=0.001). There were no complications resulting from the submucosal injection of BTX-A in the airways. CONCLUSIONS: Endobronchial injection of BTX-A reduces bronchial hyperreactivity in the airways of healthy dogs.

Full Text

Duke Authors

Cited Authors

  • Al-Halfawy, A; Gomaa, NE; Refaat, A; Wissa, M; Wahidi, MM

Published Date

  • October 2012

Published In

Volume / Issue

  • 19 / 4

Start / End Page

  • 277 - 283

PubMed ID

  • 23207526

Electronic International Standard Serial Number (EISSN)

  • 1948-8270

Digital Object Identifier (DOI)

  • 10.1097/LBR.0b013e318271179e

Language

  • eng

Conference Location

  • United States