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Pulmonary vascular abnormalities in experimentally induced congenital diaphragmatic hernia in rats
R Tenbrinck1, J L Gaillard, D Tibboel
1Department of Pediatric Surgery, Sophia Children's Hospital, Rotterdam, The Netherlands.
Insights
Congenital diaphragmatic hernia (CDH) in infants causes pulmonary artery abnormalities, leading to persistent pulmonary hypertension. A rat model closely mimics these human arterial changes, aiding research into CDH.
Area of Science:
- Pediatric Surgery
- Cardiovascular Research
- Developmental Biology
Background:
- Infants with congenital diaphragmatic hernia (CDH) exhibit pulmonary artery abnormalities, including increased medial wall thickness and decreased external diameter.
- These vascular changes contribute to persistent pulmonary hypertension, a major cause of mortality in CDH patients.
- Developing accurate experimental models is crucial for studying these pulmonary artery abnormalities.
Purpose of the Study:
- To histologically evaluate the pulmonary arterial bed in a rat model of congenital diaphragmatic hernia (CDH).
- To compare the pulmonary vasculature of CDH rats with control rats.
- To validate the rat model's resemblance to human CDH pulmonary artery pathology.
Main Methods:
- Histological examination of pulmonary arteries in newborn rats.
- Utilized a rat model induced by nitrofen exposure, with subgroups for CDH and normal diaphragm.
- Pulmonary arteries were perfused with barium gelatine, followed by fixation for analysis.
Main Results:
- CDH lungs showed significantly decreased external diameter and increased wall thickness of pulmonary arteries at the respiratory bronchiole level compared to controls.
- Abnormal muscularization was observed in the peripheral branches of pulmonary arteries in CDH lungs.
- The rat model demonstrated significant differences in pulmonary arterial morphology consistent with human CDH.
Conclusions:
- The rat model accurately replicates the pulmonary arterial bed abnormalities seen in human congenital diaphragmatic hernia (CDH).
- This model provides a valuable tool for further research into the mechanisms and potential treatments for CDH-related pulmonary hypertension.
Abstract:
In infants with congenital diaphragmatic hernia (CDH), abnormalities of the pulmonary arteries are present consisting of increased medial wall thickness and decreased external diameter. This forms the morphological substrate for persistent pulmonary hypertension, one of the leading causes of the high mortality in these patients. To elucidate the significance of these abnormalities, experimental models are required that mimic as close as possible the human situation. In our rat model we are able to study the hypoplastic CDH lungs extensively. In this study we performed a histological evaluation of the pulmonary arterial bed in the control group and the nitrofen-treated group in which the latter was divided into two subgroups, CDH and normal diaphragm. We examined the newborn rats after perfusion of the pulmonary arteries with barium gelatine and subsequent fixation. At the level of the respiratory bronchioles significant differences in the vessels were found consisting of decreased external diameter and increased wall thickness as percentage of the external thickness in CDH lungs compared with controls. Abnormal muscularization of the peripheral branches of the CDH pulmonary arteries was also found. We concluded that the rat model strongly resembles the human situation concerning the arterial bed in the lungs.