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1 Division of Pediatric Surgery
and Developmental Biology Program,
Neonates with
congenital diaphragmatic hernia (DH) die of pulmonary hypoplasia and
persistent pulmonary hypertension. We used immunohistochemical
localization of
-smooth muscle actin (
-SMA), platelet endothelial
cell adhesion molecule (PECAM)-1, thyroid transcription factor (TTF)-1,
surfactant protein (SP) A, SP-C, and competitive RT-PCR quantitation of
TTF-1, SP-A, SP-C, and
-SMA mRNA expression to characterize the
epithelial and vascular phenotype of lungs from ICR fetal mice with a
nitrofen-induced DH. Nitrofen (25 mg) was gavage fed to pregnant mice
on day 8 of gestation. Fetal mice were
delivered on day 17. The diaphragm was
examined for a defect, and the lungs were either fixed, sectioned, and
immunostained or processed for mRNA isolation. In comparison with
control lungs, DH lungs showed increased expression of
-SMA mRNA,
fewer and more muscular arterioles (
-SMA), less well-developed capillary networks (PECAM-1), delayed epithelial development marked by
a persistence of TTF-1 in the periphery, and decreased SP-A mRNA and
SP-A expression. These data suggest that in the murine nitrofen-induced
DH, as in human congenital DH, pulmonary insufficiency is due to an
inhibition of peripheral pulmonary development including terminal
airway and vascular morphogenesis.
pulmonary hypertension; pulmonary hypoplasia
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