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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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