Expression of epidermal growth factor and surfactant proteins during postnatal and compensatory lung growth

David J. Foster, Xiao Yan, Dennis J. Bellotto, Orson W. Moe, Herbert K. Hagler, Aaron S. Estrera, Connie C W Hsia

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

We examined whether lung growth after pneumonectomy (PNX) invokes normal signaling pathways of postnatal development. We qualitatively and quantitatively assessed the immunoexpression of epidermal growth factor (EGF), its receptor (EGFR), surfactant proteins (SP) [SP-A and -D and surfactant proproteins (proSP)-B and -C] and proliferating cell nuclear antigen (PCNA) in immature and mature dog lung. We also assayed these proteins in lungs of immature dogs 3 wk or 10 mo after they underwent right PNX compared with simultaneous matched sham controls, During maturation, alveolar cell proliferation is regionally regulated in parallel with EGF and EGFR levels and inversely correlated with SP-A and proSP-C levels. In contrast, post-PNX lung growth is not associated with EGF or EGFR upregulation but with markedly increased SP-A level and moderately increased SP-D level; proSP-B and proSP-C levels did not change. We conclude that 1) signaling of EGF axis and differential regulation of SPs persist during postnatal lung development, 2) post-PNX lung growth is not a simple recapitulation of maturational responses, and 3) SP-A and SP-D may modulate post-PNX lung growth.

Original languageEnglish (US)
Pages (from-to)L981-L990
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume283
Issue number5 27-5
DOIs
StatePublished - Nov 1 2002

Keywords

  • Immunoassay
  • Immunogold
  • Immunohistochemistry
  • Lung resection
  • Pneumonectomy

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

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