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1 Departament de Fisiologia-Divisió IV, 2 Departament de Bioquímica i Biologia Molecular-Divisió IV, Facultat de Farmàcia, Universitat de Barcelona, E-08028 Barcelona, Spain
In the chicken
intestine, the reduction in Na+ intake led to a decrease in
the transport of
-methyl-D-glucoside in the ileum (reduction of 42%) and in the rectum (51%). These reductions were reversed within 24 h after resalination and were inversely
correlated to the changes in aldosterone plasma concentration. The
reduction in intestinal hexose transport in the low Na+-fed
animals was due to a decrease in the number of
Na+-dependent D-glucose cotransporters (SGLT1)
in the rectum (46%) and in the ileum (38%). Northern blot analysis
showed that specific SGLT1 mRNA was expressed in the jejunum, ileum,
and rectum. The amount of SGLT1 mRNA was the same in all intestinal
regions and was not affected by Na+ intake, supporting the
view that the effects of dietary Na+ on intestinal hexose
transport involve posttranscriptional regulation of SGLT1. This study
suggests that changes in SGLT1 expression may be involved in the
homeostasis of Na+.
intestine; sugar transport; Northern blot; Western blot
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