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Studies on isolated subcellular components of cat pancreas

III. Alanine-sodium cotransport in isolated plasma membrane vesicles

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Summary

Transport of alanine was studied in isolated plasma membrane vesicles from cat pancreas using a rapid filtration technique. The uptake is osmotically sensitive and the kinetics ofl-alanine transport are biphasic showing a saturable and a nonsaturable component. The saturable component is seen only when a sodium gradient directed from the medium to the vesicular space is present. Under this condition an overshooting uptake ofl-but not ofd-alanine occurs. The Na+ gradient stimulated uptake ofl-alanine is inhibited byl-serine andl-leucine and stimulated when the membrane vesicles had been preloaded withl-alanine,l-serine orl-leucine.

The ionophore monensin inhibits stimulation of uptake caused by a sodium gradient. In the presence of valinomycin or carbonyl cyanidep-trifluoromethoxyphenylhydrazone (CFCCP), the sodium-dependent transport is augmented in vesicles preloaded with K2SO4 or H+ ions (intravesicular pH 5.5), respectively. In the presence of different anions, the Na+-dependent transport is stimulated according to increasing anionic penetration through membranes (lipid solubility). We conclude that a sodium dependent electrogenic amino acid transport system is present in pancreatic plasma membranes.

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Author notes

  1. T. Tyrakowski

    Present address: Department of Pathophysiology, Medical Academy, Poznan, Poland

Authors and Affiliations

  1. Max-Planck-Institut für Biophysik, Kennedyallee 70, 6000, Frankfurt (Main) 70, Germany

    T. Tyrakowski, S. Milutinović, I. Schulz, C. Hornung, K. Heil & J. Wiechmann

Authors
  1. T. Tyrakowski
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  2. S. Milutinović
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  3. I. Schulz
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  4. C. Hornung
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  5. K. Heil
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  6. J. Wiechmann
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Tyrakowski, T., Milutinović, S., Schulz, I. et al. Studies on isolated subcellular components of cat pancreas. J. Membrain Biol. 38, 333–346 (1978). https://doi.org/10.1007/BF01870150

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  • DOI: https://doi.org/10.1007/BF01870150

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