Meconium increases type 1 angiotensin II receptor expression and alveolar cell death

Charles R. Rosenfeld, Alexander M. Zagariya, Xiao Tie Liu, Brigham C. Willis, Steven Fluharty, Dharmapuri Vidyasagar

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The pulmonary renin-angiotensin system (RAS) contributes to inflammation and epithelial apoptosis in meconium aspiration. It is unclear if both angiotensin II receptors (ATR) contribute, where they are expressed and if meconium modifies subtype expression. We examined ATR subtypes in 2 wk rabbit pup lungs before and after meconium exposure and with and without captopril pretreatment or type 1 receptor (AT1R) inhibition with losartan, determining expression and cellular localization with immunoblots, RT-PCR and immunohistochemistry, respectively. Responses of cultured rat alveolar type II pneumocytes were also examined. Type 2 ATR were undetected in newborn lung before and after meconium instillation. AT1R were expressed in pulmonary vascular and bronchial smooth muscle and alveolar and bronchial epithelium. Meconium increased total lung AT1R protein approximately 3-fold (p = 0.006), mRNA 29% (p = 0.006) and immunostaining in bronchial and alveolar epithelium and smooth muscle, which were unaffected by captopril and losartan. Meconium also increased AT1R expression >3-fold in cultured type II pneumocytes and caused concentration-dependent cell death inhibited by losartan. Meconium increases AT1R expression in newborn rabbit lung and cultured type II pneumocytes and induces AT1R-mediated cell death. The pulmonary RAS contributes to the pathogenesis of meconium aspiration through increased receptor expression.

Original languageEnglish (US)
Pages (from-to)251-256
Number of pages6
JournalPediatric Research
Volume63
Issue number3
DOIs
StatePublished - Mar 2008

Fingerprint

Alveolar Epithelial Cells
Meconium
Angiotensin Type 1 Receptor
Cell Death
Lung
Losartan
Meconium Aspiration Syndrome
Angiotensin Receptors
Captopril
Renin-Angiotensin System
Epithelium
Angiotensin Type 2 Receptor
Rabbits
Vascular Smooth Muscle
Smooth Muscle
Immunohistochemistry
Apoptosis
Inflammation
Polymerase Chain Reaction
Messenger RNA

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

Cite this

Meconium increases type 1 angiotensin II receptor expression and alveolar cell death. / Rosenfeld, Charles R.; Zagariya, Alexander M.; Liu, Xiao Tie; Willis, Brigham C.; Fluharty, Steven; Vidyasagar, Dharmapuri.

In: Pediatric Research, Vol. 63, No. 3, 03.2008, p. 251-256.

Research output: Contribution to journalArticle

Rosenfeld, CR, Zagariya, AM, Liu, XT, Willis, BC, Fluharty, S & Vidyasagar, D 2008, 'Meconium increases type 1 angiotensin II receptor expression and alveolar cell death', Pediatric Research, vol. 63, no. 3, pp. 251-256. https://doi.org/10.1203/PDR.0b013e318163a2b8
Rosenfeld, Charles R. ; Zagariya, Alexander M. ; Liu, Xiao Tie ; Willis, Brigham C. ; Fluharty, Steven ; Vidyasagar, Dharmapuri. / Meconium increases type 1 angiotensin II receptor expression and alveolar cell death. In: Pediatric Research. 2008 ; Vol. 63, No. 3. pp. 251-256.
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