Ileal resection and dietary content of sucrose influence the intestinal uptake of monosaccharides.

The intestinal uptake of 0.5 and 40 mM glucose, galactose, and 3-O-methyl glucose (3-O-MG) was examined in vitro in rabbits fed a high (HS) or a low (LS) sucrose diet. In animals with an intact intestinal tract, the jejunal uptake of 0.5 mM 3-O-MG was unaffected by the dietary content of sucrose, whereas the uptake of 40 mM 3-O-MG was lower in LS than HS. The uptake of 40 mM galactose was higher in LS than HS and the uptake of 0.5 mM galactose was similar in HS and LS, whereas the uptake of 0.5 mM but not 40 mM glucose was lower in LS than HS. In animals subjected 6 weeks previously to an ileal resection, the adaptive changes in the jejunal uptake of the hexoses in response to alterations in the dietary content of sucrose differed from the changes observed in rabbits with an intact intestinal tract. For example, feeding HS to ileal resected animals was associated with increased jejunal uptake of 40 mM galactose, decreased uptake of 40 mM glucose, and unchanged uptake of 40 mM 3-O-MG; whereas in control animals with an intact intestinal tract, feeding HS resulted in increased uptake of 40 mM 3-O-MG, decreased uptake of 40 mM galactose, and no change in the uptake of 40 mM glucose. A similar adaptive pattern was noted in the jejunum and ileum for the effect of dietary sucrose on the uptake of 0.5 and 40 mM glucose.(ABSTRACT TRUNCATED AT 250 WORDS)