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Am J Physiol Regul Integr Comp Physiol 280: R655-R660, 2001;
0363-6119/01 $5.00
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Vol. 280, Issue 3, R655-R660, March 2001

Hormonal regulation of chicken intestinal NHE and SGLT-1 activities

Maria Carmen De La Horra, Mercedes Cano, Maria José Peral, Maria Luisa Calonge, and Anunciación Ana Ilundáin

Departamento Fisiología y Biología Animal, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain

The effects of aldosterone and arginine vasotocin (AVT) on intestinal Na+/H+ exchange (NHE) and Na+-sugar cotransport (SGLT-1) activities have been investigated using brush-border membrane vesicles isolated from Hubbard chicken small and large intestines, and they were compared with those induced by either Na+ depletion or dehydration. Na+ depletion was induced by feeding the chickens with either a low- or a high-Na+ diet for either 0.5, 1, 2, 4, or 8 days. Ileal and colonic NHE2 activity increased with the duration of the Na+ depletion, whereas that of intestinal SGLT-1 decreased, reaching a plateau after 2 days of treatment. Three-hour incubation of the intestine with aldosterone produced the same effects on NHE activity as does Na+ depletion, without altering SGLT-1 activity. However, 3-h incubation of the intestine with AVT increased intestinal SGLT-1 activity, without affecting intestinal NHE activity. It is concluded that aldosterone regulates apical ileal and colonic NHE2 activity, whereas that of SGLT-1 is regulated by AVT.

low-Na+ diet; aldosterone; arginine vasotocin; brush-border membrane vesicle; sodium/hydrogen exchange


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