title: Pulmonary neuroendocrine cell-secreted factors may alter fetal lung liquid clearance.
abstract: The neuroendocrine system is most active at birth and may play a role in the transition from fetal to postnatal life, in particular in the lungs' transition from fluid secretion to fluid absorption. Pulmonary neuroendocrine cells do release dopamine (DA), serotonin, and gastrin-releasing peptide but their effects on lung ion and fluid transport are poorly understood. Therefore, we studied their effects on fetal distal lung explants and primary cultures of fetal distal lung epithelium (FDLE). We show that DA, but neither serotonin nor gastrin-releasing peptide, alters ion and fluid transport, in a dose-dependent manner. DAs effects were abrogated by D1/D2 receptor blockers in FDLE but not in explants. Propranolol abrogated DAs effects in both models. DA increased intracellular cAMP levels in FDLE. Terbutaline, forskolin, and isobutylmethylxanthine did not increase short circuit current (Isc) in DA-treated cells, despite a further increase in cAMP. We conclude that at least one, but not all mediators released by pulmonary neuroendocrine cells alter distal lung epithelial ion transport.
authors.affiliation: CIHR Group in Lung Development, Hospital for Sick Children, Research Institute, Toronto, Ontario, Canada.
authors.forename: Shephali G
authors.initials: SG
authors.lastname: Gandhi
authors.forename: Christine
authors.initials: C
authors.lastname: Law
authors.forename: Wenming
authors.initials: W
authors.lastname: Duan
authors.forename: Gail
authors.initials: G
authors.lastname: Otulakowski
authors.forename: Hugh
authors.initials: H
authors.lastname: O'Brodovich
mesh_terms: D001692:Biological Transport / Q000187:drug effects; D000242:Cyclic AMP / Q000378:metabolism; D004298:Dopamine / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004848:Epithelium / Q000378:metabolism*; D015633:Extravascular Lung Water / Q000378:metabolism*; D005333:Fetus / Q000378:metabolism*; D019886:Gastrin-Releasing Peptide / Q000494:pharmacology; D006801:Humans; D017136:Ion Transport / Q000187:drug effects; D008168:Lung / Q000166:cytology*; D055099:Neuroendocrine Cells / Q000378:metabolism*; D011433:Propranolol; D012701:Serotonin / Q000494:pharmacology
chemical_list: D012701:Serotonin; D019886:Gastrin-Releasing Peptide; D011433:Propranolol; D000242:Cyclic AMP; D004298:Dopamine