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Division of Pulmonary and Critical Care Medicine, Michael Reese Hospital, University of Illinois at Chicago, Chicago, Illinois 60616; and Departamento de Enfermedades Respiratorias, Pontificia Universidad Católica de Chile, Santiago, Chile
-Adrenergic agonists have been
reported to increase lung liquid clearance by stimulating active
Na+ transport across the alveolar
epithelium. We studied mechanisms by which
-adrenergic isoproterenol
(Iso) increases lung liquid clearance in isolated perfused fluid-filled
rat lungs. Iso perfused through the pulmonary circulation at
concentrations of 10
4 to
10
8 M increased lung liquid
clearance compared with that of control lungs
(P < 0.01). The increase in lung
liquid clearance was inhibited by the
-antagonist propranolol
(10
5 M), the
Na+-channel blocker amiloride
(10
4 M), and the antagonist
of Na-K-ATPase, ouabain (5 × 10
4 M). Colchicine, which
inhibits cell microtubular transport of ion-transporting proteins to
the plasma membrane, blocked the stimulatory effects of Iso on active
Na+ transport, whereas the isomer
lumicolchicine, which does not affect cell microtubular transport, did
not inhibit Na+ transport. In
parallel with these changes, the Na-K-ATPase
1-subunit protein abundance and
activity increased in alveolar type II cells stimulated by
10
6 M Iso. Colchicine
blocked the stimulatory effect of Iso and the recruitment of
Na-K-ATPase
1-protein to the
basolateral membrane of alveolar type II cells. Accordingly, Iso
increased active Na+ transport and
lung liquid clearance by stimulation of
-adrenergic receptors and
probably by upregulation of apical
Na+ channels and basolateral
Na-K-ATPase mechanisms. Recruitment from intracellular pools and
microtubular transport of Na+
pumps to the plasma membrane participate in
-adrenergic stimulation of lung liquid clearance in rat lungs.
active sodium transport; lung edema clearance; apical sodium channels; sodium-potassium-adenosinetriphosphatase; cytoskeleton
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