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The Journal of General Physiology, Vol 82, 497-510, Copyright © 1983 by The Rockefeller University Press
ARTICLES |
KL Kirk and DC Dawson
Measurement of transmural sodium fluxes across isolated, ouabain- inhibited turtle colon in the presence of a serosal-to-mucosal sodium gradient shows that in the absence of active transport the amiloride- sensitive cellular path contains at least two routes for the transmural movement of sodium and lithium, one a conductive path and the other a nonconductive, cation-exchange mechanism. The latter transport element can exchange lithium for sodium, and the countertransport of these two cations provides a mechanistic basis for the ability of tight epithelia to actively absorb lithium despite the low affinity of the basolateral Na/K-ATPase for this cation.
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