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Bumetanide and bicarbonate increase short-circuit current in fetal lung epithelium
Y Marunaka1, Y Doi, T Nakahari
1MRC Group in Lung Development and Division of Respiratory Research, University of Toronto Faculty of Medicine, Ontario.
Abstract:
1. We studied the effects of bumetanide (a Na+/K+/2Cl- cotransport inhibitor) and HCO3(-) on beta-adrenergic-agonist-stimulated short-circuit current (beta-Isc) in rat fetal distal lung epithelium (FDLE). 2. Bumetanide significantly increased beta-Isc in the absence of amiloride but decreased it in its presence. The amiloride- and bumetanide-insensitive beta-Isc was diminished by a removal of HCO3(-) in the bathing solution. 3. Our results suggest that bumetanide stimulates the amiloride-sensitive beta-Isc in FDLE and that the amiloride-insensitive beta-Isc is composed of two different pathways: bumetanide-sensitive and HCO3(-)-dependent Cl- secretion in FDLE.