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Updated: Feb 1, 2026

A Simple Flow Cytometric Method to Measure Glucose Uptake and Glucose Transporter Expression for Monocyte Subpopulations in Whole Blood
Published on: August 12, 2016
d-Allulose is a substrate of glucose transporter type 5 (GLUT5) in the small intestine
Kunihiro Kishida1, Gustavo Martinez2, Tetsuo Iida3
1Department of Science and Technology on Food Safety, Kindai University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan.
Abstract:
d-Allulose has been reported to have beneficial health effects. However, the transport system(s) mediating intestinal d-allulose transport has not yet been clearly identified. The aim of this study was to investigate whether intestinal d-allulose transport is mediated by glucose transporter type 5 (GLUT5). When d-allulose alone was gavaged, plasma d-allulose levels were dramatically higher in rats previously fed fructose. This suggests enhanced intestinal d-allulose absorption paralleled increases in GLUT5 expression observed only in fructose-fed rats. When d-allulose was gavaged with d-fructose, previously observed increases in plasma d-allulose levels were dampened and delayed, indicating d-fructose inhibited transepithelial d-allulose transport into plasma. Tracer D-[14C]-fructose uptake rate was reduced to 54.8% in 50 mM d-allulose and to 16.4% in 50 mM d-fructose, suggesting d-allulose competed with D-[14C]-fructose and the affinity of d-allulose for GLUT5 was lower than that of d-fructose. GLUT5 clearly mediates, likely at lower affinity relative to d-fructose, intestinal d-allulose transport.
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