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Sodium-proton exchange in colon brush-border membranes

Binder, H. J. and Stange, G. and Murer, H. and Stieger, B. and Hauri, H. P.. (1986) Sodium-proton exchange in colon brush-border membranes. American journal of physiology. Gastrointestinal and liver physiology, Vol. 251, H. 3 , G382-G390.

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Official URL: http://edoc.unibas.ch/dok/A5257831

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Abstract

Apical membrane vesicles were prepared from proximal and distal segments of the large intestine of the rat by a method based on morphological criteria and were used to determine 22Na uptake. In both preparations an outwardly directed proton gradient stimulated 22Na uptake. In proximal colon a decrease in vesicular volume induced by an increased media osmolarity led to diminished 22Na uptake at 90 min; a significant (50-60%) portion of uptake represented binding. Initial uptake was linear for 10 s and extrapolated through zero, indicating minimal extravesicular binding. Initial uptake was a saturable function of medium Na concentration. In both preparations initial influx of 0.1 mM NaCl was inhibited by amiloride (0.1-1.0 mM), 15 mM NaCl, 15 mM LiCl, and 15 mM NH4Cl. From the characteristics of the initial 22Na influx we conclude that the apical membrane from colonocytes of proximal and distal segments contains a Na-H exchange with properties similar to those described in other epithelia.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Pharmacology/Neurobiology (Hauri)
UniBasel Contributors:Hauri, Hans-Peter
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physiological Society
ISSN:0002-9513
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:20
Deposited On:22 Mar 2012 13:19

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