Ye Zheng1, Michael G Sarr. 1. Department of Surgery and the Gastroenterology Research Unit, Mayo Clinic (GU 10-01), 200 1st Street SW, Rochester, MN 55905, USA. zheng.ye@mayo.edu
Abstract
INTRODUCTION: Sweet taste receptors may enhance glucose absorption. AIM: This study aimed to explore the cell biology of sweet taste receptors on glucose uptake. HYPOTHESIS: Artificial sweeteners increase glucose uptake via activating sweet taste receptors in the enterocyte to translocate GLUT2 to the apical membrane through the PLC βII pathway. METHODS: Caco-2, RIE-1, and IEC-6 cells, starved from glucose for 1 h were pre-incubated with 10 mM acesulfame potassium (AceK). Glucose uptake was measured by incubating cells for 1 to 10 min with 0.5-50 mM glucose with or without U-73122, chelerythrine, and cytochalasin B. RESULTS: In Caco-2 and RIE-1 cells, 10 mM AceK increased glucose uptake by 20-30 % at glucose >25 mM, but not in lesser glucose concentrations (<10 mM), nor at 1 min or 10 min incubations. U-73122 (PLC βII inhibitor) inhibited uptake at glucose >25 mM and for 5 min incubation; chelerythrine and cytochalasin B had similar effects. No effect occurred in IEC-6 cells. Activation of sweet taste receptors had no effect on glucose uptake in low (<25 mM) glucose concentrations but increased uptake at greater concentrations (>25 mM). CONCLUSIONS: Role of artificial sweeteners on glucose uptake appears to act in part by effects on the enterocyte itself.
INTRODUCTION: Sweet taste receptors may enhance glucose absorption. AIM: This study aimed to explore the cell biology of sweet taste receptors on glucose uptake. HYPOTHESIS: Artificial sweeteners increase glucose uptake via activating sweet taste receptors in the enterocyte to translocate GLUT2 to the apical membrane through the PLC βII pathway. METHODS:Caco-2, RIE-1, and IEC-6 cells, starved from glucose for 1 h were pre-incubated with 10 mM acesulfame potassium (AceK). Glucose uptake was measured by incubating cells for 1 to 10 min with 0.5-50 mM glucose with or without U-73122, chelerythrine, and cytochalasin B. RESULTS: In Caco-2 and RIE-1 cells, 10 mM AceK increased glucose uptake by 20-30 % at glucose >25 mM, but not in lesser glucose concentrations (<10 mM), nor at 1 min or 10 min incubations. U-73122 (PLC βII inhibitor) inhibited uptake at glucose >25 mM and for 5 min incubation; chelerythrine and cytochalasin B had similar effects. No effect occurred in IEC-6 cells. Activation of sweet taste receptors had no effect on glucose uptake in low (<25 mM) glucose concentrations but increased uptake at greater concentrations (>25 mM). CONCLUSIONS: Role of artificial sweeteners on glucose uptake appears to act in part by effects on the enterocyte itself.
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