The Journal of General Physiology
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The Journal of General Physiology, Vol 51, 1-12, Copyright © 1968 by The Rockefeller University Press

ARTICLE

Further Observations on Asymmetrical Solute Movement across Membranes

T. J. Franz 1, William R. Galey 1, and J. T. Van Bruggen 1

1 From the Department of Biochemistry, University of Oregon Medical School, Portland, Oregon 97201.

Captain Franz's present address is General Delivery, Letterman General Hospital, San Francisco, California 94129. Address communications regarding this work to J. T. Van Bruggen, Department of Biochemistry, University of Oregon Medical School, Portland, Oregon 97201

The permeability of frog skin under the influence of urea hyperosmolarity has been studied. Flux ratio asymmetry has been demonstrated again for tracer mannitol. The inhibitors DNP, CN-, and ouabain have been used to eliminate active sodium transport and it was found that urea hyperosmolarity produces asymmetrical mannitol fluxes on frog skins having no short-circuit current. These findings suggest that flux ratio asymmetry is due to solute interaction and is unrelated to sodium transport. Studies with a synthetic membrane show clearly that bulk flow of fluid can produce a "solvent drag" effect and change flux ratios. When bulk flow is blocked and solute gradients allowed their full expression, then solute interaction "solute drag" is easily demonstrable in a synthetic system.

Submitted on June 2, 1967


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