Paulo Manuel Pêgo Fernandes, Marcelo Manzano Said, Rogério Pazetti,
Luis Felipe Pinho Moreira, Fabio Biscegli Jatene
Objective: To evaluate the effects of azathioprine on the mucociliary system in a model of bronchial section and anastomosis in rats.
Methods: Thirty-six male Wistar-Furth rats were submitted to left bronchial section and anastomosis and divided into two groups to
receive either saline solution or azathioprine. After 7, 15 and 30 days of treatment, six animals from each group were killed, after which
in situ mucociliary transport velocity, in vitro mucus transportability, and contact angle of mucus in the right (intact) and left (sectioned)
bronchi were measured. Results: In situ mucociliary transport velocity was significantly lower in the sectioned bronchi than in the intact
bronchi (p < 0.001). In situ mucociliary transport velocity was lower in the intact bronchi of the animals treated with azathioprine for 7 days
(p < 0.05), and those bronchi presented full recovery after 30 days of treatment. The contact angle was higher in the mucus samples collected
from the sectioned bronchi of the animals treated with saline solution for 30 days (p < 0.001), which is in accordance with the decreased
in vitro mucus transportability observed in the same animals (p < 0.001). Conclusions: We conclude that, in the sectioned bronchi of rats,
treatment with azathioprine causes only transitory impairment of mucociliary transport, whereas administration of saline solution impairs
mucociliary transport for up to 30 days. In addition, azathioprine protects against alterations in mucus surface properties.
Keywords: Mucociliary clearance; Anastomosis, surgical; Immunosuppression; Lung.