Tracheal innervation is abnormal in rats with experimental congenital diaphragmatic hernia

详细信息    查看全文

• 作者：Federica Pederiva ; Rosa Aras Lopez ; Leopoldo Martinez ; Juan A. Tovar
• 关键词：Diaphragmatic hernia ; Intrinsic innervation ; Trachea ; Nitrofen ; Neural crest ; Lung
• 刊名：Journal of Pediatric Surgery
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：44
• 期：6
• 页码：1159-1164
• 全文大小：205 K

文摘

Background

Tracheobronchial motility influences lung development. Lung hypoplasia and lung sequelae accompany congenital diaphragmatic hernia (CDH) in which the vagus nerves and esophageal innervation are abnormal. As the vagus supplies tracheal innervation, this study tested the hypothesis that it might also be abnormal in rats with CDH.

Material and Methods

Intrinsic ganglia were counted and measured in whole mount acetylcholinesterase-stained tracheas from CDH and control E21 fetal rats. The relative surfaces occupied by neural structures were measured in tracheal sections immunostained for p75^NTR and PGP 9.5. PGP 9.5 protein and mRNA expression were determined. Mann-Whitney tests were used for comparisons between groups using P < .05 as significant.

Results

p75^NTR staining showed the neural crest origin of tracheal innervation. Scarce neural structures and smaller ganglia were found in CDH fetuses. PGP 9.5 protein expression was decreased in CDH fetuses, whereas PGP 9.5 mRNA levels were increased in comparison with controls.

Conclusions

Decreased density of neural structures and size of intramural ganglia, reduced expression of neural tissue and PGP 9.5 protein, and increased levels of PGP 9.5 mRNA reveal deficient tracheal innervation in rats with CDH. If similar anomalies exist in the human condition, they could contribute to explaining the pathogenesis of lung hypoplasia and bronchopulmonary sequelae.