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https://www.readbyqxmd.com/read/28534491/structural-basis-for-perception-of-diverse-chemical-substances-by-t1r-taste-receptors
#1
Nipawan Nuemket, Norihisa Yasui, Yuko Kusakabe, Yukiyo Nomura, Nanako Atsumi, Shuji Akiyama, Eriko Nango, Yukinari Kato, Mika K Kaneko, Junichi Takagi, Maiko Hosotani, Atsuko Yamashita
The taste receptor type 1 (T1r) family perceives 'palatable' tastes. These receptors function as T1r2-T1r3 and T1r1-T1r3 heterodimers to recognize a wide array of sweet and umami (savory) tastes in sugars and amino acids. Nonetheless, it is unclear how diverse tastes are recognized by so few receptors. Here we present crystal structures of the extracellular ligand-binding domains (LBDs), the taste recognition regions of the fish T1r2-T1r3 heterodimer, bound to different amino acids. The ligand-binding pocket in T1r2LBD is rich in aromatic residues, spacious and accommodates hydrated percepts...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28497839/evaluation-of-the-association-between-the-tas1r2-and-tas1r3-variants-and-food-intake-and-nutritional-status-in-children
#2
Silvia V Melo, Grasiela Agnes, Márcia R Vitolo, Vanessa S Mattevi, Paula D B Campagnolo, Silvana Almeida
Taste perception plays a key role in determining individual food preferences and dietary habits and may influence nutritional status. This study aimed to investigate the association of TAS1R2 (Ile191Val - rs35874116) and TAS1R3 (-1266 C/T - rs35744813) variants with food intake and nutritional status in children followed from birth until 7.7 years old. The nutritional status and food intake data of 312 children were collected at three developmental stages (1, 3.9 and 7.7 years old). DNA was extracted from blood samples and the polymorphisms were analyzed by real-time polymerase chain reactions (qPCR) using hydrolysis probes as the detection method...
May 11, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28399012/sweeteners-and-sweetness-enhancers
#3
Christine Belloir, Fabrice Neiers, Loïc Briand
PURPOSE OF REVIEW: The current review summarizes and discusses current knowledge on sweeteners and sweetness enhancers. RECENT FINDINGS: The perception of sweet taste is mediated by the type 1 taste receptor 2 (T1R2)/type 1 taste receptor 3 (T1R3) receptor, which is expressed in the oral cavity, where it provides input on the caloric and macronutrient contents of ingested food. This receptor recognizes all the compounds (natural or artificial) perceived as sweet by people...
July 2017: Current Opinion in Clinical Nutrition and Metabolic Care
https://www.readbyqxmd.com/read/28383662/phosphorus-taste-involves-t1r2-and-t1r3
#4
Michael G Tordoff
Rodents consume solutions of phosphates and pyrophosphates in preference to water. Recently, we found that the preference for trisodium pyrophosphate (Na3HP2O7) was greater in T1R3 knockout (KO) mice than wild-type (WT) controls, suggesting that T1R3 is a pyrophosphate detector. We now show that this heightened Na3HP2O7 preference of T1R3 KO mice extends to disodium phosphate (Na2HPO4), disodium and tetrasodium pyrophosphate (Na2H2PO4 and Na4H2PO4), a tripolyphosphate (Na5P3O10), a non-sodium phosphate [(NH4)2HPO4], and a non-sodium pyrophosphate (K4P2O7) but not to non-P salts with large anions (sodium gluconate, acetate, or propionate)...
June 1, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28192132/flavor-preferences-conditioned-by-nutritive-and-non-nutritive-sweeteners-in-mice
#5
Anthony Sclafani, Karen Ackroff
Recent studies suggest that preferences are conditioned by nutritive (sucrose) but not by non-nutritive (sucralose) sweeteners in mice. Here we compared the effectiveness of nutritive and non-nutritive sweeteners to condition flavor preferences in three mouse strains. Isopreferred sucrose and sucralose solutions both conditioned flavor preferences in C57BL/6J (B6) mice but sucrose was more effective, consistent with its post-oral appetition action. Subsequent experiments compared flavor conditioning by fructose, which has no post-oral appetition effect in B6 mice, and a sucralose+saccharin mixture (SS) which is highly preferred to fructose in 24-h choice tests...
May 1, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28119169/decreased-expression-of-5-ht1a-in-the-circumvallate-taste-cells-in-an-animal-model-of-depression
#6
Doyun Kim, Sena Chung, Sung Ho Lee, Jae Hyung Koo, Jong-Ho Lee, Jeong Won Jahng
OBJECTIVE: It has been reported that stress can cause anhedonia, a core symptom of depression, and also affect taste responses of the stressed subjects. Anhedonia refers to a reduction of the ability to experience pleasure, which can be detected by decreased response to palatable food in rats. The present study was conducted to examine if stress-induced anhedonia is accompanied by changes in gene expression for taste. DESIGN: For anhedonia test, rats had free choices of cookies, a palatable food, and chow for 1h following 1h of daily restraint sessions...
January 18, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28034739/behavioral-evidence-that-select-carbohydrate-stimuli-activate-t1r-independent-receptor-mechanisms
#7
Alan C Spector, Lindsey A Schier
Three decades ago Tony Sclafani proposed the existence of a polysaccharide taste quality that was distinguishable from the taste generated by common sweeteners and that it was mediated by a separate receptor mechanism. Since that time, evidence has accumulated, including psychophysical studies conducted in our laboratory, buttressing this hypothesis. The use of knockout (KO) mice that lack functional T1R2 + T1R3 heterodimers, the principal taste receptor for sugars and other sweeteners, have been especially informative in this regard...
December 26, 2016: Appetite
https://www.readbyqxmd.com/read/27992462/acute-effects-of-sugars-and-artificial-sweeteners-on-small-intestinal-sugar-transport-a-study-using-caco-2-cells-as-an-in-vitro-model-of-the-human-enterocyte
#8
Patrick O'Brien, Christopher Peter Corpe
BACKGROUND: The gastrointestinal tract is responsible for the assimilation of nutrients and plays a key role in the regulation of nutrient metabolism and energy balance. The molecular mechanisms by which intestinal sugar transport are regulated are controversial. Based on rodent studies, two models currently exist that involve activation of the sweet-taste receptor, T1R2/3: an indirect model, whereby luminal carbohydrates activate T1R2/3 expressed on enteroendocrine cells, resulting in the release of gut peptides which in turn regulate enterocyte sugar transport capacity; and a direct model, whereby T1R2/3 expressed on the enterocyte regulates enterocyte function...
2016: PloS One
https://www.readbyqxmd.com/read/27936499/the-anatomy-of-mammalian-sweet-taste-receptors
#9
Jean-Baptiste Chéron, Jérôme Golebiowski, Serge Antonczak, Sébastien Fiorucci
All sweet-tasting compounds are detected by a single G-protein coupled receptor (GPCR), the heterodimer T1R2-T1R3, for which no experimental structure is available. The sweet taste receptor is a class C GPCR, and the recently published crystallographic structures of metabotropic glutamate receptor (mGluR) 1 and 5 provide a significant step forward for understanding structure-function relationships within this family. In this article, we recapitulate more than 600 single point site-directed mutations and available structural data to obtain a critical alignment of the sweet taste receptor sequences with respect to other class C GPCRs...
December 9, 2016: Proteins
https://www.readbyqxmd.com/read/27877104/sweet-taste-receptor-serves-to-activate-glucose-and-leptin-responsive-neurons-in-the-hypothalamic-arcuate-nucleus-and-participates-in-glucose-responsiveness
#10
Daisuke Kohno, Miho Koike, Yuzo Ninomiya, Itaru Kojima, Tadahiro Kitamura, Toshihiko Yada
The hypothalamic feeding center plays an important role in energy homeostasis. In the feeding center, whole-body energy signals including hormones and nutrients are sensed, processed, and integrated. As a result, food intake and energy expenditure are regulated. Two types of glucose-sensing neurons exist in the hypothalamic arcuate nucleus (ARC): glucose-excited neurons and glucose-inhibited neurons. While some molecules are known to be related to glucose sensing in the hypothalamus, the mechanisms underlying glucose sensing in the hypothalamus are not fully understood...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27742692/lipid-lowering-pharmaceutical-clofibrate-inhibits-human-sweet-taste
#11
Matthew Kochem, Paul A S Breslin
T1R2-T1R3 is a heteromeric receptor that binds sugars, high potency sweeteners, and sweet taste blockers. In rodents, T1R2-T1R3 is largely responsible for transducing sweet taste perception. T1R2-T1R3 is also expressed in non-taste tissues, and a growing body of evidence suggests that it helps regulate glucose and lipid metabolism. It was previously shown that clofibric acid, a blood lipid-lowering drug, binds T1R2-T1R3 and inhibits its activity in vitro The purpose of this study was to determine whether clofibric acid inhibits sweetness perception in humans and is, therefore, a T1R2-T1R3 antagonist in vivo Fourteen participants rated the sweetness intensity of 4 sweeteners (sucrose, sucralose, Na cyclamate, acesulfame K) across a broad range of concentrations...
January 2017: Chemical Senses
https://www.readbyqxmd.com/read/27706460/alteration-of-taste-buds-in-experimental-cirrhosis-is-there-correlation-with-human-hypogeusia
#12
Sabrina Alves Fernandes, Silvia Bona, Carlos Thadeu Schmidt Cerski, Norma Possa Marroni, Claudio Augusto Marroni
Background: The inherent complications of cirrhosis include protein-calorie malnutrition and micronutrient deficiencies.Changes in taste are detrimental to the nutritional status, and the mechanism to explain these changes is not well documented in the cirrhotic patients. Objective: To evaluate the taste buds of cirrhotic rats. Methods: Fourteen male Wistar rats were evaluated. After 16 weeks, the liver was removed to histologically diagnose cirrhosis, and blood was collected to perform liver integrity tests...
October 2016: Arquivos de Gastroenterologia
https://www.readbyqxmd.com/read/27658853/sweeter-and-stronger-enhancing-sweetness-and-stability-of-the-single-chain-monellin-mnei-through-molecular-design
#13
Serena Leone, Andrea Pica, Antonello Merlino, Filomena Sannino, Piero Andrea Temussi, Delia Picone
Sweet proteins are a family of proteins with no structure or sequence homology, able to elicit a sweet sensation in humans through their interaction with the dimeric T1R2-T1R3 sweet receptor. In particular, monellin and its single chain derivative (MNEI) are among the sweetest proteins known to men. Starting from a careful analysis of the surface electrostatic potentials, we have designed new mutants of MNEI with enhanced sweetness. Then, we have included in the most promising variant the stabilising mutation E23Q, obtaining a construct with enhanced performances, which combines extreme sweetness to high, pH-independent, thermal stability...
September 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27526998/maltodextrin-and-sucrose-preferences-in-sweet-sensitive-c57bl-6j-and-subsensitive-129p3-j-mice-revisited
#14
Karen Ackroff, Anthony Sclafani
Mice are attracted to the tastes of sugar and maltodextrin solutions. Sugar taste is mediated by the T1R2/T1R3 sweet taste receptor, while maltodextrin taste is dependent upon a different as yet unidentified receptor. In a prior study sweet-sensitive C57BL/6J (B6) mice displayed similar preferences for sucrose and maltodextrin solutions in 24-h saccharide vs. water choice tests that exceeded those of sweet-subsensitive 129P3/J (129) mice. In a subsequent experiment reported here, sucrose and maltodextrin (Polycose) preference and acceptance were compared in the two strains in saccharide vs...
October 15, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27388805/impact-of-obesity-on-taste-receptor-expression-in-extra-oral-tissues-emphasis-on-hypothalamus-and-brainstem
#15
D Herrera Moro Chao, C Argmann, M Van Eijk, R G Boot, R Ottenhoff, C Van Roomen, E Foppen, J E Siljee, U A Unmehopa, A Kalsbeek, J M F G Aerts
Sweet perception promotes food intake, whereas that of bitterness is inhibitory. Surprisingly, the expression of sweet G protein-coupled taste receptor (GPCTR) subunits (T1R2 and T1R3) and bitter GPCTRs (T2R116, T2R118, T2R138 and T2R104), as well as the α-subunits of the associated signalling complex (αGustducin, Gα14 and αTransducin), in oral and extra-oral tissues from lean and obese mice, remains poorly characterized. We focused on the impact of obesity on taste receptor expression in brain areas involved in energy homeostasis, namely the hypothalamus and brainstem...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27374965/molecular-mechanisms-of-taste-disorder-in-oxaliplatin-administered-rats
#16
REVIEW
Kentaro Nishida
Taste disorder is one of the adverse effects of cancer chemotherapy resulting in a loss of appetite, leading to malnutrition and a decrease in the quality of life of the patient. Oxaliplatin, a platinum anticancer drug, has a critical role in colon cancer chemotherapy and is known to induce taste disorder. Here, we evaluated the taste functions in oxaliplatin-administered rats. Among the taste receptors, expression levels of T1R2, one of the sweet receptor subunits, increased in the circumvallate papillae of the oxaliplatin-administered rats...
2016: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/27374594/sweetness-induced-activation-of-membrane-dipole-potential-in-stc-1-taste-cells
#17
Li-Chun Chen, Ning-Ning Xie, Shao-Ping Deng
The biological functions of cell membranes strongly influence the binding and transport of molecular species. We developed STC-1 cell line stably expressing the sweet taste receptor (T1R2/T1R3), and explored the possible correlation between sweeteners and membrane dipole potential of STC-1 cells. In this study, sweetener-induced dipole potential activation was elucidated using a fluorescence-based measurement technique, by monitoring the voltage sensitive probe Di-8-ANEPPS using a dual wavelength ratiometric approach...
December 1, 2016: Food Chemistry
https://www.readbyqxmd.com/read/27353597/leptin-suppresses-sweet-taste-responses-of-enteroendocrine-stc-1-cells
#18
Masafumi Jyotaki, Keisuke Sanematsu, Noriatsu Shigemura, Ryusuke Yoshida, Yuzo Ninomiya
Leptin is an important hormone that regulates food intake and energy homeostasis by acting on central and peripheral targets. In the gustatory system, leptin is known to selectively suppress sweet responses by inhibiting the activation of sweet sensitive taste cells. Sweet taste receptor (T1R2+T1R3) is also expressed in gut enteroendocrine cells and contributes to nutrient sensing, hormone release and glucose absorption. Because of the similarities in expression patterns between enteroendocrine and taste receptor cells, we hypothesized that they may also share similar mechanisms used to modify/regulate the sweet responsiveness of these cells by leptin...
September 22, 2016: Neuroscience
https://www.readbyqxmd.com/read/27327579/duplex-bioelectronic-tongue-for-sensing-umami-and-sweet-tastes-based-on-human-taste-receptor-nanovesicles
#19
Sae Ryun Ahn, Ji Hyun An, Hyun Seok Song, Jin Wook Park, Sang Hun Lee, Jae Hyun Kim, Jyongsik Jang, Tai Hyun Park
For several decades, significant efforts have been made in developing artificial taste sensors to recognize the five basic tastes. So far, the well-established taste sensor is an E-tongue, which is constructed with polymer and lipid membranes. However, the previous artificial taste sensors have limitations in various food, beverage, and cosmetic industries because of their failure to mimic human taste reception. There are many interactions between tastants. Therefore, detecting the interactions in a multiplexing system is required...
August 23, 2016: ACS Nano
https://www.readbyqxmd.com/read/27247080/a-review-of-the-associations-between-single-nucleotide-polymorphisms-in-taste-receptors-eating-behaviours-and-health
#20
Elie Chamoun, David M Mutch, Emma Allen-Vercoe, Andrea C Buchholz, Alison M Duncan, Lawrence L Spriet, Jess Haines, David W L Ma
Food preferences and dietary habits are heavily influenced by taste perception. There is growing interest in characterizing taste preferences based on genetic variation. Genetic differences in the ability to perceive key tastes may impact eating behavior and nutritional intake. Therefore, increased understanding of taste biology and genetics may lead to new personalized strategies which may prevent or influence the trajectory of chronic diseases risk. Recent advances show that single nucleotide polymorphisms (SNPs) in the CD36 fat taste receptor are linked to differences in fat perception, fat preference, and chronic-disease biomarkers...
May 31, 2016: Critical Reviews in Food Science and Nutrition
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