Augmentation of functional prostaglandin E levels on the respiratory epithelial surface by aerosol administration of prostaglandin E. Academic Article Article uri icon

Overview

MeSH

  • Aerosols
  • Animals
  • Bronchoalveolar Lavage Fluid
  • Cell Division
  • Cells, Cultured
  • Epithelium
  • Female
  • Fibroblasts
  • Humans
  • Lung
  • Male
  • Middle Aged
  • Pulmonary Fibrosis
  • Radioimmunoassay
  • Sheep

MeSH Major

  • Alprostadil
  • Prostaglandins E
  • Pulmonary Alveoli

abstract

  • Prostaglandin E (PGE), a cyclooxygenase metabolite normally present in high concentrations in respiratory epithelial lining fluid (ELF), is capable of suppressing mesenchymal cell proliferation mediated by polypeptide-derived growth factors. Although PGE is normally abundant in respiratory ELF, PGE levels in ELF of individuals with idiopathic pulmonary fibrosis (IPF), a fibrotic lung disorder characterized by intraalveolar mesenchymal cell accumulation and fibrosis, were found to be 50% lower than normal (p less than 0.01): that is, a relative PGE "deficiency" in ELF may enhance intraalveolar mesenchymal cell proliferation in IPF. With this background, it is rational to consider augmenting PGE levels in ELF as a future therapy for IPF. Since systemic administration of PGE is associated with significant adverse effects, in vitro and experimental animal studies were carried out to evaluate whether aerosol PGE administration could augment ELF PGE levels. Greater than 50% of a solution of PGE1 could be placed in droplets less than 3 microns mass median aerodynamic diameter without loss of function. Aerosolization of PGE1 to sheep (n = 14) resulted in a marked augmentation of ELF PGE1 levels (preaerosol 20 +/- 7 nM, 30 min postaerosol 1,150 +/- 210 nM; p less than 0.0 to 0.1). ELF PGE1 levels remained elevated for up to 2 h (p less than 0.05 compared with baseline) and returned to baseline by 3 h (p greater than 0.2). Lung interstitial fluid (lymph) PGE1 levels increased slightly, but to levels far less than ELF levels (preaerosol 7 +/- 1 nM, 30 min postaerosol 13 +/- 2 nM; p less than 0.01), and plasma PGE1 levels did not change (p greater than 0.1).(ABSTRACT TRUNCATED AT 250 WORDS)

publication date

  • November 1991

has subject area

  • Aerosols
  • Alprostadil
  • Animals
  • Bronchoalveolar Lavage Fluid
  • Cell Division
  • Cells, Cultured
  • Epithelium
  • Female
  • Fibroblasts
  • Humans
  • Lung
  • Male
  • Middle Aged
  • Prostaglandins E
  • Pulmonary Alveoli
  • Pulmonary Fibrosis
  • Radioimmunoassay
  • Sheep

Research

keywords

  • Comparative Study
  • Journal Article

Identity

Language

  • eng

Digital Object Identifier (DOI)

  • 10.1164/ajrccm/144.5.1080

PubMed ID

  • 1952435

Additional Document Info

start page

  • 1080

end page

  • 1084

volume

  • 144

number

  • 5