RGD Reference Report - Prenatal administration of retinoic acid increases the trophoblastic insulin-like growth factor 2 protein expression in the nitrofen model of congenital diaphragmatic hernia. - Rat Genome Database
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Prenatal administration of retinoic acid increases the trophoblastic insulin-like growth factor 2 protein expression in the nitrofen model of congenital diaphragmatic hernia.

Authors: Kutasy, B  Friedmacher, F  Duess, JW  Puri, P 
Citation: Kutasy B, etal., Pediatr Surg Int. 2014 Feb;30(2):137-42. doi: 10.1007/s00383-013-3449-7.
RGD ID: 10402563
Pubmed: (View Article at PubMed) PMID:24352370
DOI: Full-text: DOI:10.1007/s00383-013-3449-7

BACKGROUND: The high mortality rate in congenital diaphragmatic hernia (CDH) is attributed to pulmonary hypoplasia (PH). Insulin-like growth factor 2 (IGF2) is an important regulator of fetal growth. The highest levels of IGF2 expression are found in the placenta, which are negatively regulated by decidual retinoid acid receptor alpha (RARalpha). It has been demonstrated that prenatal administration of retinoic acid (RA) suppresses decidual RARalpha expression. Previous studies have further shown that prenatal administration of RA can reverse PH in nitrofen-induced CDH model. In IGF2 knockout animals, low levels of IGF2 are associated with decreased placental growth and PH. We therefore hypothesized that nitrofen decreases trophoblastic IGF2 expression and prenatal administration of RA increases it through decidual RARalpha in the nitrofen-induced CDH model. METHODS: Pregnant rats were exposed to either olive oil or nitrofen on day 9 of gestation (D9). RA was given intraperitoneally on D18, D19 and D20. Fetuses were harvested on D21 and divided into three groups: control, CDH and nitrofen+RA. Immunohistochemistry was performed to evaluate decidual RARalpha and trophoblastic IGF2 expression. Protein levels of IGF2 in serum, intra-amniotic fluid and left lungs were measured by enzyme-linked immunosorbent assay. RESULTS: Significant growth retardation of placenta and left lungs was observed in the CDH group compared to control and nitrofen+RA group. Markedly increased decidual RARalpha and decreased IGF2 immunoreactivity were found in the CDH group compared to control and nitrofen+RA group. Significantly decreased IGF2 protein levels were detected in serum, intra-amniotic fluid and left lungs in the CDH group compared to control and nitrofen+RA group. CONCLUSION: Our findings suggest that nitrofen may disturb trophoblastic IGF2 expression through decidual RARalpha resulting in retarded placental growth and PH in the nitrofen-induced CDH. Prenatal administration of RA may promote lung and placental growth by increasing trophoblastic IGF2 expression.

Annotation

Disease Annotations    

Objects Annotated

Genes (Rattus norvegicus)
Igf2  (insulin-like growth factor 2)

Genes (Mus musculus)
Igf2  (insulin-like growth factor 2)

Genes (Homo sapiens)
IGF2  (insulin like growth factor 2)


Additional Information