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Animal Bioresource in Japan

.: Home > Animal Bioresource in Japan > 2011 > Volume 60 Number 2 > Keisuke OUE1)2), Ken-ichi MUKAISHO1), Tomoki HIGO1)2), Yoshio ARAKI1), Masanori NISHIKAWA2), Takanori HATTORI1), Gaku YAMAMOTO2) and Hiroyuki SUGIHARA1)

Histological Examination of the Relationship between Respiratory Disorders and Repetitive Microaspiration Using a Rat Gastro-Duodenal Contents Reflux Model

Keisuke OUE1)2), Ken-ichi MUKAISHO1), Tomoki HIGO1)2), Yoshio ARAKI1), Masanori NISHIKAWA2), Takanori HATTORI1), Gaku YAMAMOTO2) and Hiroyuki SUGIHARA1)
1) Departments of Pathology, Shiga University of Medical Science 2) Departments of Oral and Maxillofacial Surgery, Shiga University of Medical Science
Abstract :

Microaspiration due to gastroesophageal reflux (GER) has been suggested as a factor contributing to the development and exacerbation of several respiratory disorders. To explore the relationship between GER and respiratory disorders, we histologically examined the bilateral lungs of a rat gastroduodenal contents reflux model, which was previously used to investigate the histogenesis of Barrett’s esophagus and esophageal carcinoma. GER was surgically induced in male Wistar rats. The bilateral lungs of the reflux rats were examined with hematoxylin and eosin (HE), PAS-Alcian blue, and Azan staining at 10 and 20 weeks after surgery. Immunohistochemical staining of CD68 and α-SMA was also performed. Aspiration pneumonia with severe peribronchiolar neutrophilic and lymphocytic infiltrates, goblet cell hyperplasia, prominence of blood vessels, and increased thickness of the smooth muscle layer were detected. Bronchiolitis obliterans (BO)-like lesions comprising granulation tissue with macrophages, spindle cells, and multinucleated giant cells in the lumen of respiratory bronchioles were observed in the bilateral lungs of the reflux animals. These findings suggest that the severe inflammation and the BO-like lesions may play a role in exacerbation of the forced expiratory volume in 1 second (FEV 1) in human cases. In conclusion, we speculate that repetitive microaspiration due to GER may contribute to the exacerbation of various respiratory diseases, particularly asthma and chronic obstructive pulmonary disease (COPD), and the development of BO syndrome following lung transplantation. The reflux model is a good tool for examining the causal relationships between GER and respiratory disorders.

Keywords :
bronchiolitis obliterans, gastro-duodenal reflux, microaspiration, rat reflux model, respiratory disorder

Date Deposited : 21 Jun 2011 12:11

Last Modified : 21 Jun 2011 12:11

Official URL: http://www.jstage.jst.go.jp/browse/expanim/60/1/_contents

Volume 60, Number 2, - 2011

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