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Electrogenic transport of glucose in the normal upper duodenum. I. Technique and apparent transport constants.

Abstract：

:We investigated the electrogenic transport of glucose in the upper part of the duodenum in 11 healthy subjects by means of simultaneous intestinal perfusion of test solutions and measurement of the corresponding potential differences between blood and the duodenal lumen. The technique entailed continuous perfusion and registration of potentials through one single lumen of the probe. The basal potential difference during infusion of 154 mM NaCl was -4.9 +/- 0.5 mV (mean +/- 1 SEM). This was not significantly different from the level obtained during infusion of a standard perfusate composed like plasma: -4.3 +/- 0.5 mV. Perfusion of iso-osmolar solutions containing increasing concentrations of glucose raised the transmucosal potential difference progressively. The relation followed Michaelis-Menten kinetics, from which the apparent transport constants were calculated: Kappm = 53 mM and Vappmax = 9.9 mV. By means of repeated experiments, we examined day-to-day changes of basal potentials and electrogenic glucose transport. No significant differences or systematic variations were found.

journal_name

Scand J Gastroenterol

journal_title

Scandinavian journal of gastroenterology

authors

Sparsø BH,Luke M,Wium E

subject

Has Abstract

pub_date

1984-06-01 00:00:00

pages

561-7

issue

4

eissn

0036-5521

issn

1502-7708

journal_volume

19

pub_type

杂志文章

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