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.
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Abbreviations
- DA:
-
dopamine
- FDLE:
-
fetal distal lung epithelium
- GRP:
-
gastrin-releasing peptide
- IBMX:
-
isobutylmethylxanthine
- Isc:
-
short circuit current
- PNEC:
-
pulmonary neuroendocrine cells
- TFI:
-
terbutaline forskolin isobutylmethylxanthine
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Acknowledgements
We thank Dr. Ernest Cutz for his suggestion and encouragement to pursue an improved understanding of the effect of mediators released by neuroendocrine cells on the ion transport by fetal distal lung epithelium.
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Supported by the Heart and Stroke Foundation of Ontario Grant T5602, by the Canadian Institutes of Health Research Operating Grant MGP-25046, and Group Grant in Lung Development.
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Gandhi, S., Law, C., Duan, W. et al. Pulmonary Neuroendocrine Cell-Secreted Factors May Alter Fetal Lung Liquid Clearance. Pediatr Res 65, 274–278 (2009). https://doi.org/10.1203/PDR.0b013e3181973b22
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DOI: https://doi.org/10.1203/PDR.0b013e3181973b22
