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Brain activation by umami substances via gustatory and visceral signaling pathways, and physiological significance Kondoh T; Torii KBiol Pharm Bull 2008[Oct]; 31 (10): 1827-32Monosodium L-glutamate (MSG) elicits a unique taste termed umami and is widely used as a flavor enhancer in a variety of cuisines. Recent studies suggest the existence of L-glutamate (GLU) receptors and its transduction molecules in the gut mucosa as well as in the oral cavity. The vagal gastric afferent fibers respond specifically to the luminal stimulation of GLU in the stomach. GLU administration in the stomach also activates several brain areas (insular cortex, basal ganglia, limbic system, and hypothalamus). Ingestion of MSG enhanced secretion of digestive juices and insulin. Spontaneous ingestion of an MSG solution at the most preferred concentration (1% (w/v)) reduced weight gain, fat deposition, and plasma leptin levels without affecting food intake, naso-anal length (an index of somatic development), and lean mass in rats. These results suggest that umami signaling via gustatory and visceral pathways may play an important role in the process of digestion, absorption, metabolism, and other physiological functions via activation of the brain.|*Digestive System Physiological Phenomena[MESH]|Animals[MESH]|Brain/*physiology[MESH]|Flavoring Agents/*pharmacology[MESH]|Food Preferences/physiology[MESH]|Humans[MESH]|Signal Transduction/*drug effects[MESH]|Sodium Glutamate/*pharmacology[MESH]|Taste/*physiology[MESH] |
