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Am J Physiol Regul Integr Comp Physiol 276: R627-R631, 1999;
0363-6119/99 $5.00
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Vol. 276, Issue 2, R627-R631, February 1999

RAPID COMMUNICATION
Expression of Na+-D-glucose cotransporter in brush-border membrane of the chicken intestine

Carles Garriga, Nativitat Rovira, Miquel Moretó, and Joana M. Planas

Departament de Fisiologia-Divisió IV, Facultat de Farmàcia, Universitat de Barcelona, E-08028 Barcelona, Spain

We have studied the expression of Na+-D-glucose cotransporter in brush-border membrane vesicles (BBMVs) of chicken enterocytes to correlate the changes in the apical Na+-dependent transport with the changes in the amounts of transporter determined by Western blot analysis. Two different rabbit polyclonal antibodies were used simultaneously. The antibody raised against amino acids 564-575 of the deduced amino acid sequence of rabbit intestinal SGLT-1 (antibody 1) specifically detects a single 75-kDa band in the three segments, and this band disappeared when the antibody was preabsorbed with the antigenic peptide. The antibody raised against the synthetic peptide corresponding to amino acids 402-420 of the same protein (antibody 2) only reacts with jejunal and ileal samples, but no signal is found in BBMVs of rectum. Only when antibody 1 was used was there a linear correlation between the maximal transport rates of hexoses in BBMVs and the relative protein amounts determined by Western blot. These results indicate that the Na+-D-glucose cotransport in the jejunum, the ileum, and the rectum of chickens is due to an SGLT-1 type protein.

SGLT-1; D-glucose transport; Western blotting


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