Sugar transport by intestine. Escape of galactose from preloaded mucosa of hamster jejunum.

Biochimica Et Biophysica Acta
R D BakerA S Nunn

Abstract

Everted hamster jejunum was loaded with D-galactose and then escape into an initially galactose-free mucosal solution was followed. Mucosal anaerobiosis greatly increased the rate of escape, an effect which might have been caused by inhibiting reuptake from the unstirred layer and/or by augmenting the ease of unidirectional efflux across the brush border membrane. The former effect was expected because of our previous results from influx studies, and the main object here was to find out if the ease of efflux is affected by anaerobiosis. With phlorizin present in the mucosal solution during escape, information about unidirectional efflux was obtainable. We estimated that 10(-4) M phlorizin inhibited the ease of efflux via the phlorizin-sensitive pathway by about 65%. Apparently the reason why mucosal phlorizin accelerates escape of sugar from loaded mucosa, an effect which has been reported previously by others, is that it inhibits unidirectional efflux less effectively than it inhibits reuptake from the unstirred layer. Residual efflux via the phlorizin-sensitive pathway was markedly increased by mucosal anaerobiosis. This increase did not require an elevation of intracellular Na+ concentration. These results, together with tho...Continue Reading

References

Jan 1, 1974·The Journal of Membrane Biology·R Naftalin, P F Curran
Mar 11, 1969·Biochimica Et Biophysica Acta·P Malathi, R K Crane
Dec 1, 1967·The Journal of Cell Biology·C E Stirling

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