Full Title: Bitter receptors and glucose transporters interact to control carbohydrate and immune responses in the gut
Journal: The FASEB Journal
Year of Publication: 2016
Publication Author(s): Kimberly M Palatini, Pier-Jean Durand, Thirumurugan Rathinasabapathy, Debora Esposito and Slavko Komarnytsky
Receptors of bitter taste (T2Rs) co-localize with glucose transporters SGLT-1, GLUT2 and GLUT5 in the gastrointestinal enterocytes and enteroendocrine cells. Since plant-based foods are the primary source of both carbohydrates and bioactive bitter substances in our diet, it is possible that gastrointestinal T2Rs evolved to perceive bitter-tasting phytochemicals in anticipation of the incoming carbohydrate load, resulting in rapid changes in the gastrointestinal glucose absorption and utilization by paracrine signaling. Using a cell culture model of the small intestine, we confirmed that multiple classes of bitter phytochemicals activate bitter receptor signaling and suppress uptake of glucose from the intestinal lumen, mediated in part by cholecystokinin (CCK). Additionally, treatments with bitter extracts from chicory and other edible plants affected the PLC/PKC signaling pathway downstream of T2Rs, thus controlling biomarkers of immune and bioenergetic responses in the intestine. As alterations in normal glucose transport are strongly associated with multiple metabolic pathologies including obesity, diabetes, and cancer, these finding support the use of bioactive bitter phytochemicals to control postprandial glycaemia and reduce caloric intake in high-risk populations in clinical and community settings.
Link to Article: http://www.fasebj.org/content/30/1_Supplement/682.6.short