Link: http://www.ncbi.nlm.nih.gov/pubmed/25812446

J Pediatr Surg. 2015 Mar 14. pii: S0022-3468(15)00178-5. doi:
10.1016/j.jpedsurg.2015.03.007. [Epub ahead of print]

Increased expression of activated pSTAT3 and PIM-1 in the pulmonary vasculature of experimental congenital diaphragmatic hernia.

Hofmann AD1, Takahashi T1, Duess J2, Gosemann JH1, Puri P3.
Author information

Abstract
PURPOSE:
Signal transducer and activator of transcription (STAT) protein family (STAT1-6) regulates diverse cellular processes. Recently, the isoform STAT3 has been implicated to play a central role in the pathogenesis of pulmonary hypertension (PH). In human PH activated STAT3 (pSTAT3) was shown to directly trigger expression of the provirus integration site for Moloney murine leukemia virus (Pim-1), which promotes proliferation and resistance to apoptosis in SMCs. We designed this study to investigate the hypothesis that pSTAT3 and Pim-1 pulmonary vascular expression is increased in nitrofen-induced CDH.

METHODS:
Pregnant rats were exposed to nitrofen or vehicle on D9.5. Fetuses were sacrificed on D21 and divided into nitrofen (n=16) and control group (n=16). QRT-PCR, western blotting, and confocal-immunofluorescence were performed to determine pulmonary gene and protein expression levels of pSTAT3 and Pim-1.

RESULTS:
Pulmonary Pim-1 gene expression was significantly increased in the CDH group compared to controls. Western blotting and confocal-microscopy confirmed increased pulmonary protein expression of Pim-1 and increased activation of pSTAT3 in CDH lungs compared to controls.

CONCLUSION:
Markedly increased gene and protein expression of Pim-1 and activated pSTAT3 in the pulmonary vasculature of nitrofen-induced CDH lungs suggest that pSTAT3 and Pim-1 are important mediators of PH in nitrofen-induced CDH.

Copyright © 2015. Published by Elsevier Inc.

KEYWORDS:
Congenital diaphragmatic hernia; Nitrofen; Pim-1; Pulmonary hypertension; STAT3; Vascular remodeling
PMID: 25812446 [PubMed - as supplied by publisher]