Abstract
1. 1. Addition of d-glucose to the mucosal bathing medium stimulated rapid, sustained increases in transmural potential difference (serosa negative) and short-circuit current. 2. 2. The change in short-circuit current increased curvilinearly with increasing concentrations of mucosal d-glucose. 3. 3. Addition of phlorizin to the mucosal bathing medium partially inhibited the d-glucose stimulation of transmural potential difference and short-circuit current. 4. 4. The sugar-induced transmural potential difference and short-circuit current were dependent on Na + − K + ATPase activity. 5. 5. The major portion of the sugar-induced short-circuit current is carried by a net active chloride transfer from mucosa to serosa while the minor portion of the short-circuit current is predominantly carried by a net active sodium transfer from mucosa to serosa.
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