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- W199462078 abstract "The effect of duramycin, a polypeptide antibiotic, on Cl- transport in canine tracheal epithelium mounted in Ussing chambers was studied. Over a narrow concentration range, duramycin increased short-circuit current (Isc) and net Cl- secretion and had no effect on mannitol flux when added to the mucosal bathing solution. The maximum increase in Isc was observed at a duramycin concentration of 2 X 10(-6) M and was associated with an increase in both unidirectional Cl- fluxes. Higher duramycin concentrations produced a decrease in Isc. Submucosal addition of duramycin had no effect on Isc except at high concentrations. Pretreatment of tissues with mucosal amiloride (10(-4) M) to reduce basal Na+ transport had no effect on the subsequent response to duamycin. In other tissues pretreated with 10(-3) M dibutyryl adenosine 3',5'-cyclic monophosphate (cAMP), duramycin produced a further increase in Isc and net Cl- secretion similar to its effect in nonpretreated tissues. In all instances the increase in Isc was entirely accounted for by an increase in net Cl- secretion. We conclude that duramycin increases Isc and Cl- secretion in airway epithelium. Although the mechanism of activation is not known, these data demonstrate that duramycin increases Cl- secretion by a pathway other than cAMP. An understanding of the mechanism of action of duramycin may further our understanding of Cl- secretion regulation in airway epithelium." @default.
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- W199462078 title "Duramycin enhances chloride secretion in airway epithelium" @default.
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- W199462078 doi "https://doi.org/10.1152/ajpcell.1990.259.3.c450" @default.
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