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Nolden AA, Behrens M, McGeary JE, Meyerhof W, Hayes JE. Differential Activation of TAS2R4 May Recover Ability to Taste Propylthiouracil for Some TAS2R38 AVI Homozygotes. Nutrients 2024; 16:1357. [PMID: 38732607 PMCID: PMC11085076 DOI: 10.3390/nu16091357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 04/24/2024] [Accepted: 04/25/2024] [Indexed: 05/13/2024] Open
Abstract
Bitterness from phenylthiocarbamide and 6-n-propylthiouracil (PROP) varies with polymorphisms in the TAS2R38 gene. Three SNPs form two common (AVI, PAV) and four rare haplotypes (AAI, AAV, PVI, and PAI). AVI homozygotes exhibit higher detection thresholds and lower suprathreshold bitterness for PROP compared to PAV homozygotes and heterozygotes, and these differences may influence alcohol and vegetable intake. Within a diplotype, substantial variation in suprathreshold bitterness persists, and some AVI homozygotes report moderate bitterness at high concentrations. A second receptor encoded by a gene containing a functional polymorphism may explain this. Early work has suggested that PROP might activate TAS2R4 in vitro, but later work did not replicate this. Here, we identify three TAS2R4 SNPs that result in three diplotypes-SLN/SLN, FVS/SLN, and FVS/FVS-which make up 25.1%, 44.9%, and 23.9% of our sample. These TAS2R4 haplotypes show minimal linkage disequilibrium with TAS2R38, so we examined the suprathreshold bitterness as a function of both. The participants (n = 243) rated five PROP concentrations in duplicate, interleaved with other stimuli. As expected, the TAS2R38 haplotypes explained ~29% (p < 0.0001) of the variation in the bitterness ratings, with substantial variation within the haplotypes (AVI/AVI, PAV/AVI, and PAV/PAV). Notably, the TAS2R4 diplotypes (independent of the TAS2R38 haplotypes) explained ~7-8% of the variation in the bitterness ratings (p = 0.0001). Given this, we revisited if PROP could activate heterologously expressed TAS2R4 in HEK293T cells, and calcium imaging indicated 3 mM PROP is a weak TAS2R4 agonist. In sum, our data are consistent with the second receptor hypothesis and may explain the recovery of the PROP tasting phenotype in some AVI homozygotes; further, this finding may potentially help explain the conflicting results on the TAS2R38 diplotype and food intake.
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Affiliation(s)
- Alissa A. Nolden
- Department of Food Science, University of Massachusetts, Amherst, MA 01003, USA;
- Sensory Evaluation Center, The Pennsylvania State University, University Park, PA 16802, USA
- Department of Food Science, The Pennsylvania State University, University Park, PA 16802, USA
| | - Maik Behrens
- German Institute of Human Nutrition Potsdam-Rehbruecke, Department Molecular Genetics, 14558 Nuthetal, Germany; (M.B.); (W.M.)
- Leibniz Institute for Food Systems Biology, Technical University of Munich, 85354 Freising, Germany
| | - John E. McGeary
- Center of Innovation in Long Term Services & Supports, VA Providence Healthcare, Providence, RI 02908, USA;
- Department of Psychiatry & Human Behavior, Alpert Medical School of Brown University, Providence, RI 02903, USA
| | - Wolfgang Meyerhof
- German Institute of Human Nutrition Potsdam-Rehbruecke, Department Molecular Genetics, 14558 Nuthetal, Germany; (M.B.); (W.M.)
- Center for Integrative Physiology and Molecular Medicine, Saarland University, 66424 Homburg, Germany
| | - John E. Hayes
- Sensory Evaluation Center, The Pennsylvania State University, University Park, PA 16802, USA
- Department of Food Science, The Pennsylvania State University, University Park, PA 16802, USA
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Nguyen H, Lin C, Bell K, Huang A, Hannum M, Ramirez V, Christensen C, Rawson NE, Colquitt L, Domanico P, Sasimovich I, Herriman R, Joseph P, Braimah O, Reed DR. Worldwide study of the taste of bitter medicines and their modifiers. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.24.590957. [PMID: 38712219 PMCID: PMC11071635 DOI: 10.1101/2024.04.24.590957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
The bitter taste of medicines hinders patient compliance, but not everyone experiences these difficulties because people worldwide differ in their bitterness perception. To better understand how people from diverse ancestries perceive medicines and taste modifiers, 338 adults, European and recent US and Canada immigrants from Asia, South Asia, and Africa, rated the bitterness intensity of taste solutions on a 100-point generalized visual analog scale and provided a saliva sample for genotyping. The taste solutions were five medicines, tenofovir alafenamide (TAF), moxifloxacin, praziquantel, amodiaquine, and propylthiouracil (PROP), and four other solutions, TAF mixed with sucralose (sweet, reduces bitterness) or 6-methylflavone (tasteless, reduces bitterness), sucralose alone, and sodium chloride alone. Bitterness ratings differed by ancestry for two of the five drugs (amodiaquine and PROP) and for TAF mixed with sucralose. Genetic analysis showed that people with variants in one bitter receptor variant gene (TAS2R38) reported PROP was more bitter than did those with a different variant (p= 7.6e-19) and that people with either an RIMS2 or a THSD4 genotype found sucralose more bitter than did others (p=2.6e-8, p=7.9e-11, resp.). Our findings may help guide the formulation of bad-tasting medicines to meet the needs of those most sensitive to them.
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Affiliation(s)
- Ha Nguyen
- Monell Chemical Senses Center, Philadelphia PA, USA
| | - Cailu Lin
- Monell Chemical Senses Center, Philadelphia PA, USA
| | | | - Amy Huang
- Monell Chemical Senses Center, Philadelphia PA, USA
| | | | | | | | | | | | | | | | | | - Paule Joseph
- National Institute of Alcohol Abuse and Alcoholism & National Institute of Nursing Research, Bethesda MD, USA
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Nguyen H, Lin C, Sasimovich I, Bell K, Huang A, Leszkowicz E, Rawson NE, Reed DR. Thiazolidinediones are Partially Effective Bitter Blockers. Clin Ther 2024; 46:345-353. [PMID: 38462427 PMCID: PMC11116052 DOI: 10.1016/j.clinthera.2024.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 12/14/2023] [Accepted: 02/11/2024] [Indexed: 03/12/2024]
Abstract
PURPOSE The bad bitter taste of some medicines is a barrier to overcoming noncompliance with medication use, especially life-saving drugs given to children and the elderly. Here, we evaluated a new class of bitter blockers (thiazolidinediones, TZDs). METHODS In this study, 2 TZDs were tested, rosiglitazone (ROSI) and a simpler form of TZD, using a high-potency sweetener as a positive control (neohesperidin dihydrochalcone, NHDC). We tested bitter-blocking effects using the bitter drugs tenofovir alafenamide fumarate (TAF), a treatment for HIV and hepatitis B infection, and praziquantel (PRAZ), a treatment for schistosomiasis, by conducting taste testing with 2 separate taste panels: a general panel (N = 97, 20-23 years, 82.5% female, all Eastern European) and a genetically informative panel (N = 158, including 68 twin pairs, 18-82 years, 76% female, 87% European ancestry). Participants rated the bitterness intensity of the solutions on a 100-point generalized visual analog scale. FINDINGS Person-to-person differences in drug bitterness were striking; TAF and PRAZ were weakly or not bitter for some people but moderately to highly bitter for others. Participants in both taste panels rated the bitter drugs TAF and PRAZ as less bitter on average when mixed with NHDC than when sampled alone. ROSI partially suppressed the bitterness of TAF and PRAZ, but effectiveness differed between the 2 panels: bitterness was significantly reduced for PRAZ but not TAF in the general panel and for TAF but not PRAZ in the genetically informative panel. ROSI was a more effective blocker than the other TZD. IMPLICATIONS These results suggest that TZDs are partially effective bitter blockers and the suppression efficacy differs from drug to drug, from person to person, and from panel to panel, suggesting other TZDs should be designed and tested with more drugs and on diverse populations to define which ones work best with which drugs and for whom. The discovery of bitter receptor blockers can improve compliance with medication use.
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Affiliation(s)
- Ha Nguyen
- Monell Chemical Senses Center, Philadelphia, Pennsylvania
| | - Cailu Lin
- Monell Chemical Senses Center, Philadelphia, Pennsylvania
| | | | - Katherine Bell
- Monell Chemical Senses Center, Philadelphia, Pennsylvania
| | - Amy Huang
- Monell Chemical Senses Center, Philadelphia, Pennsylvania
| | - Emilia Leszkowicz
- Department of Animal and Human Physiology, Faculty of Biology, University of Gdańsk, Gdańsk, Poland
| | - Nancy E Rawson
- Monell Chemical Senses Center, Philadelphia, Pennsylvania
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Bloxham CJ, Hulme KD, Fierro F, Fercher C, Pegg CL, O'Brien SL, Foster SR, Short KR, Furness SGB, Reichelt ME, Niv MY, Thomas WG. Cardiac human bitter taste receptors contain naturally occurring variants that alter function. Biochem Pharmacol 2024; 219:115932. [PMID: 37989413 DOI: 10.1016/j.bcp.2023.115932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 10/26/2023] [Accepted: 11/16/2023] [Indexed: 11/23/2023]
Abstract
Bitter taste receptors (T2R) are a subfamily of G protein-coupled receptors that enable humans to detect aversive and toxic substances. The ability to discern bitter compounds varies between individuals and is attributed mainly to naturally occurring T2R polymorphisms. T2Rs are also expressed in numerous non-gustatory tissues, including the heart, indicating potential contributions to cardiovascular physiology. In this study. T2Rs that have previously been identified in human cardiac tissues (T2Rs - 10, 14, 30, 31, 46 and 50) and their naturally occurring polymorphisms were functionally characterised. The ligand-dependent signaling responses of some T2R variants were completely abolished (T2R30 Leu252 and T2R46 Met228), whereas other receptor variants had moderate changes in their maximal response, but not potency, relative to wild type. Using a cAMP fluorescent biosensor, we reveal the productive coupling of T2R14, but not the T2R14 Phe201 variant, to endogenous Gαi. Modeling revealed that these variants resulted in altered interactions that generally affected ligand binding (T2R30 Leu252) or Gα protein interactions (T2R46 Met228 and T2R14 Phe201), rather than receptor structural stability. Interestingly, this study is the first to show a difference in signaling for T2R50 Tyr203 (rs1376251) which has been associated with cardiovascular disease. The observation of naturally occurring functional variation in the T2Rs with the greatest expression in the heart is important, as their discovery should prove useful in deciphering the role of T2Rs within the cardiovascular system.
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Affiliation(s)
- Conor J Bloxham
- School of Biomedical Sciences, Faculty of Medicine, University of Queensland, QLD, Australia; Regenerative Medicine in Cardiovascular Diseases, First Department of Medicine, Klinikum rechts der Isar, Technical University of Munich, Germany
| | - Katina D Hulme
- School of Chemistry and Molecular Biosciences, Faculty of Science, University of Queensland, QLD, Australia; Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands
| | - Fabrizio Fierro
- Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Israel
| | - Christian Fercher
- Australian Institute for Bioengineering and Nanotechnology, University of Queensland, QLD, Australia
| | - Cassandra L Pegg
- School of Chemistry and Molecular Biosciences, Faculty of Science, University of Queensland, QLD, Australia
| | - Shannon L O'Brien
- Institute of Metabolism and Systems Research, University of Birmingham, United Kingdom; Centre of Membrane Proteins and Receptors (COMPARE), Universities of Nottingham and Birmingham, Birmingham, United Kingdom
| | - Simon R Foster
- School of Biomedical Sciences, Faculty of Medicine, University of Queensland, QLD, Australia; QIMR Berghofer Medical Research Institute, Herston, QLD, Australia
| | - Kirsty R Short
- School of Chemistry and Molecular Biosciences, Faculty of Science, University of Queensland, QLD, Australia
| | - Sebastian G B Furness
- School of Biomedical Sciences, Faculty of Medicine, University of Queensland, QLD, Australia; Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
| | - Melissa E Reichelt
- School of Biomedical Sciences, Faculty of Medicine, University of Queensland, QLD, Australia
| | - Masha Y Niv
- Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Israel
| | - Walter G Thomas
- School of Biomedical Sciences, Faculty of Medicine, University of Queensland, QLD, Australia.
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Nguyen H, Lin C, Sasimovich I, Bell K, Huang A, Leszkowicz E, Rawson NE, Reed DR. Thiazolidinediones are partially effective bitter blockers. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.08.552460. [PMID: 37609224 PMCID: PMC10441302 DOI: 10.1101/2023.08.08.552460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
Purpose The bad bitter taste of some medicines is a barrier to overcoming non-compliance with medication use, especially life-saving drugs given to children and the elderly. Here we evaluated a new class of bitter blockers (thiazolidinediones; TZDs). Methods In this study, two TZDs were tested, rosiglitazone (ROSI) and a simpler form of TZD, using a high-potency sweetener as a positive control (neohesperidin dihydrochalcone, NHDC). We tested bitter-blocking effects using the bitter drugs tenofovir alafenamide fumarate (TAF), a treatment for HIV and hepatitis B infection, and praziquantel (PRAZ), a treatment for schistosomiasis, by conducting taste testing with two separate taste panels: a general panel (N=97, 20-23 yrs, 82.5% female, all Eastern European) and a genetically informative panel (N=158, including 68 twin pairs, 18-82 yrs, 76% female, 87% European ancestry). Participants rated the bitterness intensity of the solutions on a 100-point generalized visual analog scale. Findings Participants in both taste panels rated the bitter drugs TAF and PRAZ as less bitter on average when mixed with NHDC than when sampled alone. ROSI partially suppressed the bitterness of TAF and PRAZ, but effectiveness differed between the two panels: bitterness was significantly reduced for PRAZ but not TAF in the general panel and for TAF but not PRAZ in the genetically informative panel. ROSI was a more effective blocker than the other TZD. Implications These results suggest that TZDs are partially effective bitter blockers, suggesting other TZDs should be designed and tested with more drugs and on diverse populations to define which ones work best with which drugs and for whom. The discovery of bitter receptor blockers can improve compliance with medication use.
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Affiliation(s)
- Ha Nguyen
- Monell Chemical Senses Center, Philadelphia, PA, 19104, USA
| | - Cailu Lin
- Monell Chemical Senses Center, Philadelphia, PA, 19104, USA
| | | | - Katherine Bell
- Monell Chemical Senses Center, Philadelphia, PA, 19104, USA
| | - Amy Huang
- Monell Chemical Senses Center, Philadelphia, PA, 19104, USA
| | - Emilia Leszkowicz
- Dept. Animal and Human Physiology, Faculty of Biology, University of Gdańsk, Gdańsk, Poland
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Aoki K, Mori K, Iijima S, Sakon M, Matsuura N, Kobayashi T, Takanashi M, Yoshimura T, Mori N, Katayama T. Association between Genetic Variation in the TAS2R38 Bitter Taste Receptor and Propylthiouracil Bitter Taste Thresholds among Adults Living in Japan Using the Modified 2AFC Procedure with the Quest Method. Nutrients 2023; 15:2415. [PMID: 37242298 PMCID: PMC10222862 DOI: 10.3390/nu15102415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/15/2023] [Accepted: 05/15/2023] [Indexed: 05/28/2023] Open
Abstract
Individual taste sensitivity influences food preferences, nutritional control, and health, and differs greatly between individuals. The purpose of this study was to establish a method of measuring and quantifying an individual's taste sensitivity and to evaluate the relationship between taste variation and genetic polymorphisms in humans using agonist specificities of the bitter taste receptor gene, TAS2R38, with the bitter compound 6-n-propylthiouracil (PROP). We precisely detected the threshold of PROP bitter perception by conducting the modified two-alternative forced-choice (2AFC) procedure with the Bayesian staircase procedure of the QUEST method and examined genetic variation in TAS2R38 in a Japanese population. There were significant differences in PROP threshold between the three TAS2R38 genotype pairs for 79 subjects: PAV/PAV vs AVI/AVI, p < 0.001; PAV/AVI vs AVI/AVI, p < 0.001; and PAV/PAV vs PAV/AVI, p < 0.01. Our results quantified individual bitter perception as QUEST threshold values: the PROP bitter perception of individuals with the PAV/PAV or PAV/AVI genotypes was tens to fifty times more sensitive than that of an individual with the AVI/AVI genotype. Our analyses provide a basic model for the accurate estimation of taste thresholds using the modified 2AFC with the QUEST approach.
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Affiliation(s)
- Kyoko Aoki
- Department of Advanced Medical Treatment & Nutritional Science, United Graduate School of Child Development, Osaka University, Suita 565-0871, Osaka, Japan; (K.M.); (N.M.); (T.K.)
| | - Kanetaka Mori
- Department of Advanced Medical Treatment & Nutritional Science, United Graduate School of Child Development, Osaka University, Suita 565-0871, Osaka, Japan; (K.M.); (N.M.); (T.K.)
- Division of Math, Sciences, and Information Technology in Education, Osaka Kyoiku University, Kashiwara 582-8582, Osaka, Japan
| | - Shohei Iijima
- Osaka Prefectural Hospital Organization, Osaka International Cancer Institute, Chuo-ku 541-8567, Osaka, Japan; (S.I.); (M.S.)
| | - Masato Sakon
- Osaka Prefectural Hospital Organization, Osaka International Cancer Institute, Chuo-ku 541-8567, Osaka, Japan; (S.I.); (M.S.)
| | - Nariaki Matsuura
- Department of Advanced Medical Treatment & Nutritional Science, United Graduate School of Child Development, Osaka University, Suita 565-0871, Osaka, Japan; (K.M.); (N.M.); (T.K.)
- Osaka Prefectural Hospital Organization, Osaka International Cancer Institute, Chuo-ku 541-8567, Osaka, Japan; (S.I.); (M.S.)
| | | | | | - Takeshi Yoshimura
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, Suita 565-0871, Osaka, Japan
| | - Norio Mori
- Department of Advanced Medical Treatment & Nutritional Science, United Graduate School of Child Development, Osaka University, Suita 565-0871, Osaka, Japan; (K.M.); (N.M.); (T.K.)
- Department of Psychiatry and Neurology, Fukude Nishi Hospital, Iwata 437-1216, Shizuoka, Japan
| | - Taiichi Katayama
- Department of Advanced Medical Treatment & Nutritional Science, United Graduate School of Child Development, Osaka University, Suita 565-0871, Osaka, Japan; (K.M.); (N.M.); (T.K.)
- Department of Child Development and Molecular Brain Science, United Graduate School of Child Development, Osaka University, Suita 565-0871, Osaka, Japan
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Kurshed AAM, Vincze F, Pikó P, Kósa Z, Sándor J, Ádány R, Diószegi J. Taste Preference-Related Genetic Polymorphisms Modify Alcohol Consumption Behavior of the Hungarian General and Roma Populations. Genes (Basel) 2023; 14:genes14030666. [PMID: 36980937 PMCID: PMC10048713 DOI: 10.3390/genes14030666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 02/28/2023] [Accepted: 03/06/2023] [Indexed: 03/30/2023] Open
Abstract
Harmful alcohol consumption has been considered a major public health issue globally, with the amounts of alcohol drunk being highest in the WHO European Region including Hungary. Alcohol consumption behaviors are complex human traits influenced by environmental factors and numerous genes. Beyond alcohol metabolization and neurotransmitter gene polymorphisms, taste preference-related genetic variants may also mediate alcohol consumption behaviors. Applying the Alcohol Use Disorders Identification Test (AUDIT) we aimed to elucidate the underlying genetic determinants of alcohol consumption patterns considering taste preference gene polymorphisms (TAS1R3 rs307355, TAS2R38 rs713598, TAS2R19 rs10772420 and CA6 rs2274333) in the Hungarian general (HG) and Roma (HR) populations. Alcohol consumption assessment was available for 410 HG and 387 HR individuals with 405 HG and 364 HR DNA samples being obtained for genotyping. No significant associations were found between TAS1R3 rs307355, TAS2R19 rs10772420, and CA6 rs2274333 polymorphisms and alcohol consumption phenotypes. Significant associations were identified between TAS2R38 rs713598 and the number of standard drinks consumed in the HG sample (genotype GG negatively correlated with the number of standard drinks; coef: -0.136, p = 0.028) and the prevalence of having six or more drinks among Roma (a negative correlation was identified in the recessive model; genotype GG, coef: -0.170, p = 0.049), although, none of these findings passed the Bonferroni-corrected probability criterion (p > 0.05). Nevertheless, our findings may suggest that alcohol consumption is partially driven by genetically determined taste preferences in our study populations. Further studies are required to strengthen the findings and to understand the drivers of alcohol consumption behavior in more depth.
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Affiliation(s)
- Ali Abbas Mohammad Kurshed
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 4028 Debrecen, Hungary
- Doctoral School of Health Sciences, University of Debrecen, 4032 Debrecen, Hungary
- Institute of Nutrition and Food Science, University of Dhaka, Dhaka 1000, Bangladesh
| | - Ferenc Vincze
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 4028 Debrecen, Hungary
| | - Péter Pikó
- ELKH-DE Public Health Research Group, University of Debrecen, 4028 Debrecen, Hungary
| | - Zsigmond Kósa
- Department of Health Methodology and Public Health, Faculty of Health Sciences, University of Debrecen, 4400 Nyíregyháza, Hungary
| | - János Sándor
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 4028 Debrecen, Hungary
- ELKH-DE Public Health Research Group, University of Debrecen, 4028 Debrecen, Hungary
| | - Róza Ádány
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 4028 Debrecen, Hungary
- ELKH-DE Public Health Research Group, University of Debrecen, 4028 Debrecen, Hungary
- Department of Public Health, Semmelweis University, 1089 Budapest, Hungary
| | - Judit Diószegi
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 4028 Debrecen, Hungary
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Gervis JE, Ma J, Chui KKH, McKeown NM, Levy D, Lichtenstein AH. Bitter- and Umami-Related Genes are Differentially Associated with Food Group Intakes: the Framingham Heart Study. J Nutr 2023; 153:483-492. [PMID: 36774228 PMCID: PMC10196583 DOI: 10.1016/j.tjnut.2022.11.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 10/12/2022] [Accepted: 11/14/2022] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND As suboptimal diet quality remains the leading modifiable contributor to chronic disease risk, it is important to better understand the individual-level drivers of food choices. Recently, a genetic component of food choices was proposed based on variants (SNPs) in genes related to taste perception (taste-related SNPs). OBJECTIVES This study aimed to determine the cumulative contribution of taste-related SNPs for basic tastes (bitter, sweet, umami, salt, and sour), summarized as "polygenic taste scores," to food group intakes among adults. METHODS Cross-sectional analyses were performed on 6230 Framingham Heart Study participants (mean age ± SD: 50 ± 14 y; 54% female). Polygenic taste scores were derived for tastes with ≥2 related SNPs identified in prior genome-wide association studies, and food group intakes (servings per week [sev/wk]) were tabulated from food frequency questionnaires. Associations were determined via linear mixed-effects models, using false discovery rates and bootstrap resampling to determine statistical significance. RESULTS Thirty-three taste-related SNPs (9 bitter, 19 sweet, 2 umami, 2 sour, 1 salt) were identified and used to derive polygenic taste scores for bitter, sweet, umami, and sour. Per additional allele for higher bitter perception, whole grain intakes were lower by 0.17 (95% CI: -0.28, -0.06) sev/wk, and for higher umami perception, total and red/orange vegetable intakes were lower by 0.73 (95% CI: -1.12, -0.34) and 0.25 (95% CI: -0.40, -0.10) sev/wk, respectively. Subsequent analyses at the SNP level identified four novel SNP-diet associations-two bitter-related SNPs with whole grains (rs10960174 and rs6782149) and one umami-related SNP with total and red/orange vegetables (rs7691456)-which may have been driving the identified associations. CONCLUSIONS Taste-related genes for bitter and umami were differentially associated with food choices that may impact diet quality. Hence, a benefit could be derived from leveraging knowledge of taste-related genes when developing personalized risk reduction dietary guidance.
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Affiliation(s)
- Julie E Gervis
- Cardiovascular Nutrition Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA.
| | - Jiantao Ma
- Nutritional Epidemiology and Data Science, Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA, USA.
| | - Kenneth K H Chui
- Department of Public Health and Community Medicine, Tufts University School of Medicine, Boston, MA, USA.
| | - Nicola M McKeown
- Department of Health Sciences, Sargent College of Health & Rehabilitation Sciences, Boston University, Boston, MA, USA.
| | - Daniel Levy
- Population Sciences Branch, National Heart, Lung, and Blood Institute, National Institute of Health, Bethesda, MD, USA; Boston University and National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, MA, USA.
| | - Alice H Lichtenstein
- Cardiovascular Nutrition Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA.
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9
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Wang X, Wang L, Xia M, Teng F, Chen X, Huang R, Zhou J, Xiao J, Zhai L. Variations in the TAS2R38 gene among college students in Hubei. Hereditas 2022; 159:46. [PMID: 36529808 PMCID: PMC9762079 DOI: 10.1186/s41065-022-00260-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND The bitter taste receptor gene TAS2R38 is a member of the human TAS2R gene family. Polymorphisms in TAS2R38 affect the ability to taste the bitterness of phenylthiourea (PTC) compounds, thus affecting an individual's food preference and health status. METHODS We investigated polymorphisms in the TAS2R38 gene and the sensitivity to PTC bitterness among healthy Chinese college students in Hubei province. The association of TAS2R38 polymorphisms and PTC sensitivity with body mass index (BMI), food preference, and health status was also analyzed. A total of 320 healthy college students were enrolled (male: 133, female: 187; aged 18-23 years). The threshold value method was used to measure the perception of PTC bitterness, and a questionnaire was used to analyze dietary preferences and health status. Polymerase chain reaction (PCR) was used to analyze polymorphisms at three common TAS2R38 loci (rs713598, rs1726866, and rs10246939). RESULTS In our study population, 65.00% of individuals had medium sensitivity to the bitterness of PTC; in contrast, 20.94% were highly sensitive to PTC bitterness, and 14.06% were not sensitive. For the TAS2R38 gene, the PAV/PAV and PAV/AAI diplotypes were the most common (42.19% and 40.63%, respectively), followed by the homozygous AVI/AVI (8.75%) and PAV/AVI (5.00%) diplotypes. CONCLUSION There was a significant correlation between the sensitivity to PTC bitterness and sex, but there was no correlation between the common diplotypes of TAS2R38 and gender. Polymorphisms in the TAS2R38 gene were associated with the preference for tea, but not with one's native place, BMI, health status, or other dietary preferences. There was no significant correlation between the perception of PTC bitterness and one's native place, BMI, dietary preference, or health status. We hope to find out the relationship between PTC sensitivity and TAS2R38 gene polymorphisms and dietary preference and health status of Chinese population through this study, providing relevant guidance and suggestions for dietary guidance and prevention of some chronic diseases in Chinese population.
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Affiliation(s)
- Xiaojun Wang
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
| | - Lin Wang
- grid.412979.00000 0004 1759 225XXiangyang Stomatological Hospital, Affiliated Stomatological Hospital of Hubei University of Arts and Science, 441003 Xiangyang, China
| | - Mengwei Xia
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
| | - Feng Teng
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
| | - Xuejiao Chen
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
| | - Rufeng Huang
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
| | - Jiahao Zhou
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
| | - Juan Xiao
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
| | - Lihong Zhai
- grid.412979.00000 0004 1759 225XSchool of Basic Medicine, Hubei University of Arts and Science, Xiangyang, 441053 China
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10
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Qi FY, Zhu ZH, Li M, Guan Y, Peng QY, Lu SM, Liu ZH, Wang MF, Miao MM, Chen ZY, Li XM, Bai J, Yao JH, Yao J. Genetic variations in the bitter taste receptor gene TAS2R38 are related to cigarette smoking behavior in Han Chinese smokers. Genes Genomics 2022; 44:1363-1374. [PMID: 36125655 DOI: 10.1007/s13258-022-01311-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 08/18/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Smoking behavior is influenced by multiple genes, including the bitter taste gene TAS2R38. It has been reported that the correlation between TAS2R38 and smoking behavior has ethnicity-based differences. However, the TAS2R38 status in Chinese smokers is still unclear. OBJECTIVE This study aims to investigate the possible relationship between genetic variations in TAS2R38 (A49P, V262A and I296V) and smoking behaviors in the Han Chinese population. METHODS The haplotype analyses were performed and smoking behavior questionnaire was completed by 1271 individuals. Genetic association analyses for smoking behavior were analyzed using chi-square test. Further, for investigating the molecular mechanism of TAS2R38 variants effect on smoking behavior, we conducted TAS2R38-PAV and TAS2R38-AVI expression plasmids and tested the cellular calcium assay by cigarette smoke compounds stimulus in HEK293. RESULTS Significant associations of genetic variants within TAS2R38 were identified with smoking behavior. We found a higher PAV/PAV frequency than AVI/AVI in moderate and high nicotine dependence (FTND ≥ 4; X2 = 4.611, 1 df, p = 0.032) and strong cigarette smoke flavor intensity preference (X2 = 4.5383, 1 df, p = 0.033) in participants. Furthermore, in the in vitro cellular calcium assay, total particle matter (TPM), N-formylnornicotine and cotinine, existing in cigarette smoke, activated TAS2R38-PAV but not TAS2R38-AVI-transfected cells. CONCLUSION Our data highlights that genetic variations in TAS2R38 are related to smoking behavior, especially nicotine dependence and cigarette smoke flavor intensity preference. Our findings may encourage further consideration of the taste process to identify individuals susceptible to nicotine dependence, particularly Han Chinese smokers.
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Affiliation(s)
- Fei-Yan Qi
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Zhou-Hai Zhu
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Meng Li
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Ying Guan
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Qi-Yuan Peng
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - She-Ming Lu
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Zhi-Hua Liu
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Ming-Feng Wang
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Ming-Ming Miao
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Zhang-Yu Chen
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Xue-Mei Li
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
| | - Jie Bai
- Medical Faculty, Kunming University of Science and Technology, Kunming, 650500, China
| | - Jian-Hua Yao
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China.
| | - Jianhua Yao
- Joint Institute of Tobacco and Health, Kunming, 650106, Yunnan, China
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11
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Wooding SP, Ramirez VA. Worldwide diversity, association potential, and natural selection in the superimposed taste genes, CD36 and GNAT3. Chem Senses 2022; 47:6491270. [PMID: 34972209 DOI: 10.1093/chemse/bjab052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
CD36 and GNAT3 mediate taste responses, with CD36 acting as a lipid detector and GNAT3 acting as the α subunit of gustducin, a G protein governing sweet, savory, and bitter transduction. Strikingly, the genes encoding CD36 and GNAT3 are genomically superimposed, with CD36 completely encompassing GNAT3. To characterize genetic variation across the CD36-GNAT3 region, its implications for phenotypic diversity, and its recent evolution, we analyzed from ~2,500 worldwide subjects sequenced by the 1000 Genomes Project (1000GP). CD36-GNAT3 harbored extensive diversity including 8,688 single-nucleotide polymorphisms (SNPs), 414 indels, and other complex variants. Sliding window analyses revealed that nucleotide diversity and population differentiation across CD36-GNAT3 were consistent with genome-wide trends in the 1000GP (π = 0.10%, P = 0.64; FST = 9.0%, P = 0.57). In addition, functional predictions using SIFT and PolyPhen-2 identified 60 variants likely to alter protein function, and they were in weak linkage disequilibrium (r2 < 0.17), suggesting their effects are largely independent. However, the frequencies of predicted functional variants were low (P¯ = 0.0013), indicating their contributions to phenotypic variance on population scales are limited. Tests using Tajima's D statistic revealed that pressures from natural selection have been relaxed across most of CD36-GNAT3 during its recent history (0.39 < P < 0.67). However, CD36 exons showed signs of local adaptation consistent with prior reports (P < 0.035). Thus, CD36 and GNAT3 harbor numerous variants predicted to affect taste sensitivity, but most are rare and phenotypic variance on a population level is likely mediated by a small number of sites.
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Affiliation(s)
- Stephen P Wooding
- Department of Anthropology, University of California, Merced, Merced, CA, USA
| | - Vicente A Ramirez
- Department of Public Health, University of California, Merced, Merced, CA, USA
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12
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Zehentner S, Reiner AT, Grimm C, Somoza V. The Role of Bitter Taste Receptors in Cancer: A Systematic Review. Cancers (Basel) 2021; 13:5891. [PMID: 34885005 PMCID: PMC8656863 DOI: 10.3390/cancers13235891] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 11/11/2021] [Accepted: 11/15/2021] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Since it is known that bitter taste receptors (TAS2Rs) are expressed and functionally active in various extra-oral cells, their genetic variability and functional response initiated by their activation have become of broader interest, including in the context of cancer. METHODS A systematic research was performed in PubMed and Google Scholar to identify relevant publications concerning the role of TAS2Rs in cancer. RESULTS While the findings on variations of TAS2R genotypes and phenotypes and their association to the risk of developing cancer are still inconclusive, gene expression analyses revealed that TAS2Rs are expressed and some of them are predominately downregulated in cancerous compared to non-cancerous cell lines and tissue samples. Additionally, receptor-specific, agonist-mediated activation induced various anti-cancer effects, such as decreased cell proliferation, migration, and invasion, as well as increased apoptosis. Furthermore, the overexpression of TAS2Rs resulted in a decreased tumour incidence in an in vivo study and TAS2R activation could even enhance the therapeutic effect of chemotherapeutics in vitro. Finally, higher expression levels of TAS2Rs in primary cancerous cells and tissues were associated with an improved prognosis in humans. CONCLUSION Since current evidence demonstrates a functional role of TAS2Rs in carcinogenesis, further studies should exploit their potential as (co-)targets of chemotherapeutics.
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Affiliation(s)
- Sofie Zehentner
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (S.Z.); (A.T.R.)
| | - Agnes T. Reiner
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (S.Z.); (A.T.R.)
| | - Christoph Grimm
- Comprehensive Cancer Center Vienna, Gynecologic Cancer Unit, Department of General Gynecology and Gynecologic Oncology, Medical University of Vienna, 1090 Vienna, Austria;
| | - Veronika Somoza
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (S.Z.); (A.T.R.)
- Leibniz Institute of Food Systems Biology at the Technical University of Munich, 85354 Freising, Germany
- Chair of Nutritional Systems Biology, School of Life Science, Technical University of Munich, 85354 Freising, Germany
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13
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Tiroch J, Sterneder S, Di Pizio A, Lieder B, Hoelz K, Holik AK, Pignitter M, Behrens M, Somoza M, Ley JP, Somoza V. Bitter Sensing TAS2R50 Mediates the trans-Resveratrol-Induced Anti-inflammatory Effect on Interleukin 6 Release in HGF-1 Cells in Culture. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:13339-13349. [PMID: 33461297 DOI: 10.1021/acs.jafc.0c07058] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Recent data have shown anti-inflammatory effects for trans-resveratrol (RSV) and rosmarinic acid (RA) in various immune-competent cell models through reduction of lipopolysaccharide (LPS)-induced interleukin 6 (IL-6) release. Because both compounds have been reported to taste bitter, we hypothesized an involvement of human bitter taste sensing receptors (TAS2Rs) on IL-6 release in LPS-treated human gingival fibroblasts (HGF-1). First, the bitter taste intensity of RSV and RA was compared in a sensory trial with 10 untrained panelists, of whom 90% rated a 50 ppm of RSV in water solution more bitter than 50 ppm of RA. A mean 19 ± 6% reduction of the RSV-induced bitter taste intensity was achieved by co-administration of 50 ppm of the bitter-masking, TAS2R43 antagonist homoeriodictyol (HED). Mechanistic experiments in a stably CRISPR-Cas9-edited TAS2R43ko gastric cell model revealed involvement of TAS2R43 in the HED-evoked effect on RSV-induced proton secretion, whereas the cellular response to RSV did not depend upon TAS2R43. Next, the IL-6 modulatory effect of 100 μM RSV was studied in LPS-treated immune-competent HGF-1 cells. After 6 h of treatment, RSV reduced the LPS-induced IL-6 gene expression and protein release by -46.2 ± 12.7 and -73.9 ± 2.99%, respectively. This RSV-evoked effect was abolished by co-administration of HED. Because real-time quantitative polymerase chain reaction analyses revealed a regulation of TAS2R50 in RSV with or without HED-treated HGF-1 cells, an siRNA knockdown approach of TAS2R50 was applied to verify TAS2R50 involvement in the RSV-induced reduction of the LPS-evoked IL-6 release in HGT-1 cells.
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Affiliation(s)
- Johanna Tiroch
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Sonja Sterneder
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Antonella Di Pizio
- Leibniz-Institute of Food Systems Biology at the Technical University of Munich, 85354 Freising, Germany
| | - Barbara Lieder
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Kathrin Hoelz
- Department of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Ann-Katrin Holik
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Marc Pignitter
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Maik Behrens
- Leibniz-Institute of Food Systems Biology at the Technical University of Munich, 85354 Freising, Germany
| | - Mark Somoza
- Leibniz-Institute of Food Systems Biology at the Technical University of Munich, 85354 Freising, Germany
- Department of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, 85354 Freising, Germany
| | | | - Veronika Somoza
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
- Leibniz-Institute of Food Systems Biology at the Technical University of Munich, 85354 Freising, Germany
- Chair for Nutritional Systems Biology, Technical University of Munich, 85354 Freising, Germany
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14
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Yang H, Yang S, Fan F, Li Y, Dai S, Zhou X, Steiner CC, Coppedge B, Roos C, Cai X, Irwin DM, Shi P. A New World Monkey Resembles Human in Bitter Taste Receptor Evolution and Function via a Single Parallel Amino Acid Substitution. Mol Biol Evol 2021; 38:5472-5479. [PMID: 34469542 PMCID: PMC8662605 DOI: 10.1093/molbev/msab263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Bitter taste receptors serve as a vital component in the defense system against toxin intake by animals, and the family of genes encoding these receptors has been demonstrated, usually by family size variance, to correlate with dietary preference. However, few systematic studies of specific Tas2R to unveil their functional evolution have been conducted. Here, we surveyed Tas2R16 across all major clades of primates and reported a rare case of a convergent change to increase sensitivity to β-glucopyranosides in human and a New World monkey, the white-faced saki. Combining analyses at multiple levels, we demonstrate that a parallel amino acid substitution (K172N) shared by these two species is responsible for this functional convergence of Tas2R16. Considering the specialized feeding preference of the white-faced saki, the K172N change likely played an important adaptive role in its early evolution to avoid potentially toxic cyanogenic glycosides, as suggested for the human TAS2R16 gene.
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Affiliation(s)
- Hui Yang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
| | - Songlin Yang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.,University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Fei Fan
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.,University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Yun Li
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.,University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - Shaoxing Dai
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
| | - Xin Zhou
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
| | - Cynthia C Steiner
- San Diego Zoo Wildlife Alliance, Beckman Center for Conservation Research, San Pasqual Valley Road, Escondido, CA, 15600, United States 92027
| | - Bretton Coppedge
- San Diego Zoo Wildlife Alliance, Beckman Center for Conservation Research, San Pasqual Valley Road, Escondido, CA, 15600, United States 92027
| | - Christian Roos
- Gene Bank of Primates and Primate Genetics Laboratory, German Primate Center, Leibniz Institute for Primate Research, Kellnerweg 4, Göttingen, 37077, Germany
| | - Xianghai Cai
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China
| | - David M Irwin
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
| | - Peng Shi
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.,Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, 650223, China
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15
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Association of single nucleotide polymorphisms with taste and food preferences of the Hungarian general and Roma populations. Appetite 2021; 164:105270. [PMID: 33930497 DOI: 10.1016/j.appet.2021.105270] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 04/14/2021] [Accepted: 04/15/2021] [Indexed: 11/20/2022]
Abstract
It is reasonable to suppose that poor diet underlies the unfavorable health status of the Roma population of Europe. Previously in the framework of a complex health survey, fruit and vegetable consumption, quantity of sugar added, salting frequency; bitter, salty, sweet and fat taste preferences were evaluated of Hungarian (HG, n = 410) and Roma (HR, n = 387) populations. In the present study the associations of taste and food preferences with TAS1R3, CD36, SCNN1B, TRPV1, TAS2R38, TAS2R19 and CA6 polymorphisms were tested in the same samples. Genotype frequencies did not differ significantly between the two populations. Although we initially observed associations between certain genetic polymorphisms and taste and food preferences in our study samples, none of the p values remained significant after the multiple test correction. However, some of our results could be considered promising (0.05<corrected p < 0.20), which showed potential ethnicity-specific effects (CA6 rs2274333 with salty taste and raw kohlrabi preference, CD36 rs1527483 with fat taste preference, TAS2R19 rs10772420 with grapefruit preference, and TAS2R38 rs713598 with quantity of sugar added). Our results may suggest that genetics may mediate food preferences, and individuals with different ethnic background may require personalized interventions to modify diet. Further investigations with greater sample sizes are essential to explore the effect of these genetic variants on taste and food preferences.
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16
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TAS2R38 Haplotype Predicts 24-Hour Urinary Sodium Excretion in Patients With Heart Failure and Their Family Caregivers. J Cardiovasc Nurs 2020; 36:238-244. [PMID: 32453275 DOI: 10.1097/jcn.0000000000000692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND Adherence to a low-sodium diet is essential to self-care of heart failure (HF). Genetic determinants of preference for high-sodium foods may impede adherence but have not been well-studied. OBJECTIVE Our purpose was to examine if TAS2R38 haplotype predicted salt taste sensitivity and dietary sodium intake among patients with HF. METHOD This pilot study used baseline data from a large interventional randomized control trial to support adherence to a low-sodium diet in patients with HF and their family caregivers. Participants were tested for salt taste sensitivity and provided a 24-hour urinary sodium sample and a blood sample for DNA analysis at baseline. Fungiform papillae were counted. χ2 Test and 1-way analysis of variance were used to compare haplotype groups. Linear regression was performed to examine predictors of salt taste sensitivity and 24-hour urinary sodium excretion, controlling for age, gender, ethnicity, smoking status, and fungiform papillae density. RESULTS There were 42 patients with HF and their family caregivers (age, 64.6 ± 13.4 years, 46.5% male, 97.7% white, and 90.7% nonsmoker). Pronine-alanine-valine homozygous haplotype predicted lower urinary sodium excretion (b = -1780.59, t41 = -2.18, P = .036), but genotype was not a significant predictor of salt taste sensitivity. CONCLUSIONS The results of our study partially supported our hypothesis that PAV homozygous haplotype predicts 24-hour urinary sodium excretion. With our small sample size, more research is needed. Understanding genetic influences on taste can lead to development of educational interventions tailored to patients with HF and their family caregivers to better support dietary adherence.
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17
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Nolden AA, Feeney EL. Genetic Differences in Taste Receptors: Implications for the Food Industry. Annu Rev Food Sci Technol 2020; 11:183-204. [PMID: 31922882 DOI: 10.1146/annurev-food-032519-051653] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Inborn genetic differences in chemosensory receptors can lead to differences in perception and preference for foods and beverages. These differences can drive market segmentation for food products as well as contribute to nutritional status. This knowledge may be essential in the development of foods and beverages because the sensory profiles may not be experienced in the same way across individuals. Rather, distinct consumer groups may exist with different underlying genetic variations. Identifying genetic factors associated with individual variability can help better meet consumer needs through an enhanced understanding of perception and preferences. This review provides an overview of taste and chemesthetic sensations and their receptors, highlighting recent advances linking genetic variations in chemosensory genes to perception, food preference and intake, and health. With growing interest in personalized foods, this information is useful for both food product developers and nutrition health professionals alike.
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Affiliation(s)
- Alissa A Nolden
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts 01003, USA;
| | - Emma L Feeney
- Institute of Food and Health, University College Dublin, Dublin 4, Ireland
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18
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Diószegi J, Llanaj E, Ádány R. Genetic Background of Taste Perception, Taste Preferences, and Its Nutritional Implications: A Systematic Review. Front Genet 2019; 10:1272. [PMID: 31921309 PMCID: PMC6930899 DOI: 10.3389/fgene.2019.01272] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 11/19/2019] [Indexed: 01/01/2023] Open
Abstract
Background: The rise in nutrition-related morbidity and mortality requires public health intervention programs targeting nutritional behavior. In addition to socio-economical, socio-cultural, psychological determinants, taste is one of the main factors that influence food choices. Differences in taste perception and sensitivity may be explained by genetic variations, therefore the knowledge of the extent to which genetic factors influence the development of individual taste preferences and eating patterns is important for public policy actions addressing nutritional behaviors. Our aim was to review genetic polymorphisms accounting for variability in taste and food preferences to contribute to an improved understanding of development of taste and food preferences. Methods: The electronic databases PubMed, Scopus, and Web of Science were searched using MeSH in PubMed and free text terms for articles published between January 1, 2000 and April 13, 2018. The search strategy was conducted following the PRISMA statement. The quality of the included studies was assessed by the validated Q-Genie tool. Results: Following the PRISMA flowchart, finally 103 articles were included in the review. Among the reviewed studies, 43 were rated to have good quality, 47 were rated to have moderate quality, and 13 were rated to have low quality. The majority of the studies assessed the association of genetic variants with the bitter taste modality, followed by articles analyzing the impact of polymorphisms on sweet and fat preferences. The number of studies investigating the association between umami, salty, and sour taste qualities and genetic polymorphisms was limited. Conclusions: Our findings suggest that a significant association exists between TAS2R38 variants (rs713598, rs1726866, rs10246939) and bitter and sweet taste preference. Other confirmed results are related to rs1761667 (CD36) and fat taste responsiveness. Otherwise further research is essential to confirm results of studies related to genetic variants and individual taste sensitivity. This knowledge may enhance our understanding of the development of individual taste and related food preferences and food choices that will aid the development of tailored public health strategy to reduce nutrition-related disease and morbidity.
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Affiliation(s)
- Judit Diószegi
- MTA-DE Public Health Research Group, Public Health Research Institute, University of Debrecen, Debrecen, Hungary
| | - Erand Llanaj
- Doctoral School of Health Sciences, University of Debrecen, Debrecen, Hungary
| | - Róza Ádány
- MTA-DE Public Health Research Group, Public Health Research Institute, University of Debrecen, Debrecen, Hungary.,Doctoral School of Health Sciences, University of Debrecen, Debrecen, Hungary.,WHO Collaborating Centre on Vulnerability and Health, University of Debrecen, Debrecen, Hungary
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19
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Coltell O, Sorlí JV, Asensio EM, Fernández-Carrión R, Barragán R, Ortega-Azorín C, Estruch R, González JI, Salas-Salvadó J, Lamon-Fava S, Lichtenstein AH, Corella D. Association between taste perception and adiposity in overweight or obese older subjects with metabolic syndrome and identification of novel taste-related genes. Am J Clin Nutr 2019; 109:1709-1723. [PMID: 31005965 DOI: 10.1093/ajcn/nqz038] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Accepted: 02/25/2019] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The relation between taste perception, diet, and adiposity remains controversial. Additionally, there is a lack of knowledge on the polymorphisms influencing taste given the scarcity of genome-wide association studies (GWASs) published. OBJECTIVES We studied the relation between perception of the basic tastes, i.e., sweet, salty, bitter, sour, and umami (separately and jointly in a "taste score"), and anthropometric measurements in older subjects with metabolic syndrome (MetS). GWASs were undertaken to identify genes associated with basic tastes and their score. METHODS Taste perception was cross-sectionally determined by challenging subjects (381 older individuals with MetS) with solutions (5 concentrations) of the basic tastes with the use of standard prototypical tastants (phenylthiocarbamide and 6-n-propylthiouracil, NaCl, sucrose, monopotassium glutamate, and citric acid, for bitter, salt, sweet, umami, and sour, respectively). Taste perception intensities were expressed on a scale. A total taste score was derived. RESULTS The total taste score was inversely associated with body weight, body mass index, and waist circumference (P < 0.05). Subjects having a total taste score higher than or equal to the median (11 points for concentration V) were less likely to be classified as obese than subjects below the median (OR: 0.36; 95% CI: 0.22, 0.59; P < 0.001). Associations were similar, albeit less strong, for some taste qualities. In the GWASs, the highest associations were for bitter taste (rs1726866-TAS2R38, with P = 7.74 × 10-18 for phenylthiocarbamide and P = 3.96 × 10-19 for 6-n-propylthiouracil). For other tastes, several single-nucleotide polymorphisms (SNPs) exceeded the P threshold of 1 × 10-5. However, the top-ranked SNPs independently explained a low percentage of taste variability, hence their use as single proxies for the association between taste perception and adiposity is limited. CONCLUSIONS We found a strong inverse association between greater taste perception and body weight, body mass index, and waist circumference in older subjects with MetS and identified some taste-related SNPs. It would be advantageous to identify additional genetic proxies for taste and to develop polygenic scores. Data used in this study were derived from the clinical trial PREDIMED PLUS at baseline, registered at http://www.isrctn.com as ISRCTN89898870.
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Affiliation(s)
- Oscar Coltell
- Department of Computer Languages and Systems, Universitat Jaume I, Castellón, Spain.,CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain
| | - José V Sorlí
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Preventive Medicine and Public Health, School of Medicine, University of Valencia, Valencia, Spain
| | - Eva M Asensio
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Preventive Medicine and Public Health, School of Medicine, University of Valencia, Valencia, Spain
| | - Rebeca Fernández-Carrión
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Preventive Medicine and Public Health, School of Medicine, University of Valencia, Valencia, Spain
| | - Rocío Barragán
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Preventive Medicine and Public Health, School of Medicine, University of Valencia, Valencia, Spain
| | - Carolina Ortega-Azorín
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Preventive Medicine and Public Health, School of Medicine, University of Valencia, Valencia, Spain
| | - Ramon Estruch
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Internal Medicine, Hospital Clínic, IDIBAPS, Barcelona, Spain
| | - José I González
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Preventive Medicine and Public Health, School of Medicine, University of Valencia, Valencia, Spain
| | - Jordi Salas-Salvadó
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Human Nutrition Unit, Biochemistry and Biotechnology Department, IISPV, University Rovira i Virgili, Reus, Spain
| | - Stefania Lamon-Fava
- Cardiovascular Nutrition Laboratory, JM-USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA
| | - Alice H Lichtenstein
- Cardiovascular Nutrition Laboratory, JM-USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA
| | - Dolores Corella
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,Department of Preventive Medicine and Public Health, School of Medicine, University of Valencia, Valencia, Spain
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20
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Behrens M, Meyerhof W. A role for taste receptors in (neuro)endocrinology? J Neuroendocrinol 2019; 31:e12691. [PMID: 30712315 DOI: 10.1111/jne.12691] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/14/2019] [Accepted: 01/29/2019] [Indexed: 12/12/2022]
Abstract
The sense of taste is positioned at the forefront when it comes to the interaction of our body with foodborne chemicals. However, the role of our taste system, and in particular its associated taste receptors, is not limited to driving food preferences leading to ingestion or rejection before other organs take over responsibility for nutrient digestion, absorption and metabolic regulation. Taste sensory elements do much more. On the one hand, extra-oral taste receptors from the brain to the gut continue to sense nutrients and noxious substances after ingestion and, on the other hand, the nutritional state feeds back on the taste system. This intricate regulatory network is orchestrated by endocrine factors that are secreted in response to taste receptor signalling and, in turn regulate the taste receptor cells themselves. The present review summarises current knowledge on the endocrine regulation of the taste perceptual system and the release of hunger/satiety regulating factors by gastrointestinal taste receptors. Furthermore, the regulation of blood glucose levels via the activation of pancreatic sweet taste receptors and subsequent insulin secretion, as well as the influence of bitter compounds on thyroid hormone release, is addressed. Finally, the central effects of tastants are discussed briefly.
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Affiliation(s)
- Maik Behrens
- Leibniz-Institute for Food Systems Biology at the Technical University of Munich, Freising, Germany
| | - Wolfgang Meyerhof
- Center for Integrative Physiology and Molecular Medicine, Saarland University, Homburg, Germany
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21
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Abstract
This chapter summarizes the available data about taste receptor functions and their role in perception of food with emphasis on the human system. In addition we illuminate the widespread presence of these receptors throughout the body and discuss some of their extraoral functions. Finally, we describe clinical aspects where taste receptor signaling could be relevant.
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Affiliation(s)
- Jonas C Töle
- Department of Molecular Genetics, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Maik Behrens
- Leibniz-Institute for Food Systems Biology at the Technical University of Munich, Freising, Germany
| | - Wolfgang Meyerhof
- Center for Integrative Physiology and Molecular Medicine, Saarland University, Homburg, Germany.
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22
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Bitter, Sweet, Salty, Sour and Umami Taste Perception Decreases with Age: Sex-Specific Analysis, Modulation by Genetic Variants and Taste-Preference Associations in 18 to 80 Year-Old Subjects. Nutrients 2018; 10:nu10101539. [PMID: 30340375 PMCID: PMC6213100 DOI: 10.3390/nu10101539] [Citation(s) in RCA: 118] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 10/09/2018] [Accepted: 10/15/2018] [Indexed: 12/15/2022] Open
Abstract
There is growing interest in relating taste perception to diet and healthy aging. However, there is still limited information on the influence of age, sex and genetics on taste acuity as well as on the relationship between taste perception and taste preferences. We have analysed the influence of age on the intensity rating of the five basic tastes: sweet, salty, bitter, sour and umami (separately and jointly in a “total taste score”) and their modulation by sex and genetics in a relatively healthy population (men and women) aged 18–80 years (n = 1020 Caucasian European participants). Taste perception was determined by challenging subjects with solutions of the five basic tastes using standard prototypical tastants (6-n-propylthiouracil (PROP), NaCl, sucrose, monopotassium glutamate and citric acid) at 5 increasing concentrations (I to V). We also measured taste preferences and determined the polymorphisms of the genes taste 2 receptor member 38 (TAS2R38), taste 1 receptor member 2 (TAS2R38) and sodium channel epithelial 1 beta subunit (SCNN1B), as TAS2R38-rs713598, TAS1R2-rs35874116 and SCNN1B-rs239345 respectively. We found a statistically significant decrease in taste perception (“total taste score”) with increasing age for all the concentrations analysed. This association was stronger for the higher concentrations (p = 0.028; p = 0.012; p = 0.005; p = 4.20 × 10−5 and p = 1.48 × 10−7, for I to V in the multivariable-adjusted models). When we analysed taste qualities (using concentration V), the intensity rating of all the 5 tastes was diminished with age (p < 0.05 for all). This inverse association differed depending on the test quality, being higher for bitter (PROP) and sour. Women perceived taste significantly more intense than men (p = 1.4 × 10−8 for total taste score). However, there were differences depending on the taste, umami being the lowest (p = 0.069). There was a complex association between the ability to perceive a taste and the preference for the same. Significant associations were, nevertheless, found between a higher perception of sour taste and a higher preference for it in women. In contrast, the higher perception of sweet was significantly associated with a higher preference for bitter in both, men and women. The TAS2R38-rs713598 was strongly associated with bitter (PROP) taste (p = 1.38 × 10−50), having a significant interaction with sex (p = 0.030). The TAS1R2-rs35874116 was not significantly associated with sweet, whereas the SCNN1B-rs239345 was associated (p = 0.040) with salty taste. In conclusion, the inverse association between age and perceived taste intensity as well as the additional influence of sex and some genetic polymorphisms give rise to large inter-individual differences in taste perception and taste preferences that should be taken into account in future studies and for applications in precision nutrition for healthy aging.
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23
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Wild and domesticated Moringa oleifera differ in taste, glucosinolate composition, and antioxidant potential, but not myrosinase activity or protein content. Sci Rep 2018; 8:7995. [PMID: 29789671 PMCID: PMC5964143 DOI: 10.1038/s41598-018-26059-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 05/03/2018] [Indexed: 11/09/2022] Open
Abstract
Taste drives consumption of foods. The tropical tree Moringa oleifera is grown worldwide as a protein-rich leafy vegetable and for the medicinal value of its phytochemicals, in particular its glucosinolates, which can lead to a pronounced harsh taste. All studies to date have examined only cultivated, domestic variants, meaning that potentially useful variation in wild type plants has been overlooked. We examine whether domesticated and wild type M. oleifera differ in myrosinase or glucosinolate levels, and whether these different levels impact taste in ways that could affect consumption. We assessed taste and measured levels of protein, glucosinolate, myrosinase content, and direct antioxidant activity of the leaves of 36 M. oleifera accessions grown in a common garden. Taste tests readily highlighted differences between wild type and domesticated M. oleifera. There were differences in direct antioxidant potential, but not in myrosinase activity or protein quantity. However, these two populations were readily separated based solely upon their proportions of the two predominant glucosinolates (glucomoringin and glucosoonjnain). This study demonstrates substantial variation in glucosinolate composition within M. oleifera. The domestication of M. oleifera appears to have involved increases in levels of glucomoringin and substantial reduction of glucosoonjnain, with marked changes in taste.
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24
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Leite ICR, Dos Santos Júnior JC, de Sousa CCS, Lima AV, Miranda-Vilela AL. Recognition of phenylthiocarbamide (PTC) in taste test is related to blood group B phenotype, females, and risk of developing food allergy: a cross-sectional Brazilian-based study. Nutr Res 2018; 52:22-38. [PMID: 29764625 DOI: 10.1016/j.nutres.2017.12.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 12/11/2017] [Accepted: 12/22/2017] [Indexed: 12/18/2022]
Abstract
Anti-nutritional factors, including hemagglutinins, are natural substances that reduce nutritional bioavailability and/or generate adverse physiological effects. Most are bitter toxic compounds, but present chemo-protective properties at low concentrations. Responses to phenylthiocarbamide (PTC) allow for an evaluation of humans' perception of bitter taste, a perception that has evolutionary advantages. Therefore, we hypothesized that relationships between food preference, dietary exposures and disease risk could reflect possible associations not only with the recognition threshold for the bitter taste of PTC, but also with ABO/Rh blood group phenotypes. To test this hypothesis, 375 volunteers of both genders, aged 16-49 years, were recruited. Data were obtained from laboratory tests and questionnaires. PTC test followed literature; blood typing used commercially available sera. Allele frequencies calculated from phenotypes were: T=0.51, t=0.49 (PTC); IA=0.22, IB=0.08, i=0.70 (ABO); D=0.57, d=0.43 (Rh). Associations with the recognition threshold for bitter taste were found for blood group B, females, and risk of developing food allergy for bitter taste at PTC dilution 1 (the highest concentration) (OR=3.862; 95%CI=1.387-10.756; p=0.016); for each more diluted PTC solution, the chance of food allergy fell 25.2% (95%CI = 0.764-0.836), while for each more concentrated solution the chance of food allergy increased 20.1% (p=0.000). There were also nominally significant differences among PTC tasting, ABO/Rh, genders and age-groups in relation to food preferences. Results demonstrated that the ability to recognize PTC in taste test is related to blood group B, females, and risk of developing food allergy, thus confirming the research hypothesis, and presenting original and important associations.
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Affiliation(s)
- Isac César Roldão Leite
- Faculdade de Medicina, Faculdades Integradas da União Educacional do Planalto Central (Faciplac), Campus Gama, DF, Brazil
| | - José Carlos Dos Santos Júnior
- Faculdade de Medicina, Faculdades Integradas da União Educacional do Planalto Central (Faciplac), Campus Gama, DF, Brazil
| | - Cinthya Clara Silva de Sousa
- Faculdade de Medicina, Faculdades Integradas da União Educacional do Planalto Central (Faciplac), Campus Gama, DF, Brazil
| | | | - Ana Luisa Miranda-Vilela
- Departamento de Genética e Morfologia, Instituto de Ciências Biológicas, Universidade de Brasília, Campus Darcy Ribeiro, Brasilia, DF, Brazil.
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25
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Stern L, Giese N, Hackert T, Strobel O, Schirmacher P, Felix K, Gaida MM. Overcoming chemoresistance in pancreatic cancer cells: role of the bitter taste receptor T2R10. J Cancer 2018; 9:711-725. [PMID: 29556329 PMCID: PMC5858493 DOI: 10.7150/jca.21803] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 11/26/2017] [Indexed: 12/14/2022] Open
Abstract
Bitter taste receptors (T2Rs) are G-protein coupled transmembrane proteins initially identified in the gustatory system as sensors for the taste of bitter. Recent evidence on expression of these receptors outside gustatory tissues suggested alternative functions, and there is growing interest of their potential role in cancer biology. In this study, we report for the first time, expression and functionality of the bitter receptor family member T2R10 in both human pancreatic ductal adenocarcinoma (PDAC) tissue and PDAC derived cell lines. Caffeine, a known ligand for T2R10, rendered the tumor cells more susceptible to two standard chemotherapeutics, Gemcitabine and 5-Fluoruracil. Knocking down T2R10 in the cell line BxPC-3 reduced the caffeine-induced effect. As possible underlying mechanism, we found that caffeine via triggering T2R10 inhibited Akt phosphorylation and subsequently downregulated expression of ABCG2, the so-called multi-drug resistance protein that participates in rendering cells resistant to a variety of chemotherapeutics. In conclusion, T2R10 is expressed in pancreatic cancer and it downmodulates the chemoresistance of the tumor cells.
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Affiliation(s)
- Louisa Stern
- Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Nathalia Giese
- Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Thilo Hackert
- Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Oliver Strobel
- Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Peter Schirmacher
- Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Klaus Felix
- Department of General, Visceral and Transplantation Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Matthias M Gaida
- Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany
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26
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Risso D, Behrens M, Sainz E, Meyerhof W, Drayna D. Probing the Evolutionary History of Human Bitter Taste Receptor Pseudogenes by Restoring Their Function. Mol Biol Evol 2017; 34:1587-1595. [PMID: 28333344 DOI: 10.1093/molbev/msx097] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Lineage-specific gene losses can be driven by selection or environmental adaptations. However, a lack of studies on the original function of species-specific pseudogenes leaves a gap in our understanding of their role in evolutionary histories. Pseudogenes are of particular relevance for taste perception genes, which encode for receptors that confer the ability to both identify nutritionally valuable substances and avoid potentially harmful substances. To explore the role of bitter taste pseudogenization events in human origins, we restored the open reading frames of the three human-specific pseudogenes and synthesized the reconstructed functional hTAS2R2, hTAS2R62 and hTAS2R64 receptors. We have identified ligands that differentially activate the human and chimpanzee forms of these receptors and several other human functional TAS2Rs. We show that these receptors are narrowly tuned, suggesting that bitter-taste sensitivities evolved independently in different species, and that these pseudogenization events occurred because of functional redundancy. The restoration of function of lineage-specific pseudogenes can aid in the reconstruction of their evolutionary history, and in understanding the forces that led to their pseudogenization.
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Affiliation(s)
- Davide Risso
- National Institute on Deafness and Other Communication Disorders, NIH, Bethesda, MD.,Department of BiGeA, Laboratory of Molecular Anthropology and Centre for Genome Biology, University of Bologna, Bologna, Italy
| | - Maik Behrens
- Molecular Genetics, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Eduardo Sainz
- National Institute on Deafness and Other Communication Disorders, NIH, Bethesda, MD
| | - Wolfgang Meyerhof
- Molecular Genetics, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
| | - Dennis Drayna
- National Institute on Deafness and Other Communication Disorders, NIH, Bethesda, MD
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27
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Verbeurgt C, Veithen A, Carlot S, Tarabichi M, Dumont JE, Hassid S, Chatelain P. The human bitter taste receptor T2R38 is broadly tuned for bacterial compounds. PLoS One 2017; 12:e0181302. [PMID: 28902853 PMCID: PMC5597121 DOI: 10.1371/journal.pone.0181302] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 06/24/2017] [Indexed: 11/18/2022] Open
Abstract
T2R38 has been shown to be a specific bacterial detector implicated in innate immune defense mechanism of human upper airway. Several clinical studies have demonstrated that this receptor is associated with the development of chronic rhinosinusitis (CRS). T2R38 was previously reported to bind to homoserine lactones (HSL), quorum sensing molecules specific of Pseudomonas Aeruginosa and other gram negative species. Nevertheless, these bacteria are not the major pathogens found in CRS. Here we report on the identification of bacterial metabolites acting as new agonists of T2R38 based on a single cell calcium imaging study. Two quorum sensing molecules (Agr D1 thiolactone from Staphylococcus Aureus and CSP-1 from Streptococcus Pneumoniae) and a list of 32 bacterial metabolites from pathogens frequently implicated in CRS were tested. First, we observed that HSL failed to activate T2R38 in our experimental system, but that the dimethylsulfoxide (DMSO), used as a solvent for these lactones may, by itself, account for the agonistic effect previously described. Secondly, we showed that both Agr D1 thiolactone and CSP-1 are inactive but that at least 7 bacterial metabolites (acetone, 2-butanone, 2-pentanone, 2-methylpropanal, dimethyl disulfide, methylmercaptan, γ-butyrolactone) are able to specifically trigger this receptor. T2R38 is thus much more broadly tuned for bacterial compounds than previously thought.
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Affiliation(s)
- Christophe Verbeurgt
- Department of Otorhinolaryngology, Erasme University Hospital, Free University of Brussels, Brussels, Belgium
- * E-mail:
| | | | - Sébastien Carlot
- Department of Otorhinolaryngology, Erasme University Hospital, Free University of Brussels, Brussels, Belgium
| | - Maxime Tarabichi
- Institute of Interdisciplinary Research in human and molecular Biology, Free University of Brussels, Brussels, Belgium
| | - Jacques E. Dumont
- Institute of Interdisciplinary Research in human and molecular Biology, Free University of Brussels, Brussels, Belgium
| | - Sergio Hassid
- Department of Otorhinolaryngology, Erasme University Hospital, Free University of Brussels, Brussels, Belgium
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28
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Wieczorek MN, Walczak M, Skrzypczak-Zielińska M, Jeleń HH. Bitter taste of Brassica vegetables: The role of genetic factors, receptors, isothiocyanates, glucosinolates, and flavor context. Crit Rev Food Sci Nutr 2017; 58:3130-3140. [PMID: 28718657 DOI: 10.1080/10408398.2017.1353478] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
It is well known that consumption of Brassica vegetables has beneficial effect on human's health. The greatest interest is focused on glucosinolates and their hydrolysis products isothiocyanates, due to their potential as cancer preventing compounds. Brassica vegetables are also rich in flavor compounds belonging to many chemical groups. The main sensory sensation related to these vegetable is their characteristic sharp and bitter taste, and unique aroma. Because of these features this group of vegetables is often rejected by consumers. Interestingly, for some people unpleasant sensations are not perceived, suggesting a potential role of inter-individual variability in bitter taste perception and sensibility. Receptors responsible for bitter sensation with the emphasis on Brassica are reviewed, as well as genetic predisposition for bitterness perception by consumers. Also the role of glucosinolates and isothiocyanates as compounds responsible for bitter taste is discussed based on data from the field of food science and molecular biology. Isothiocyanates are shown in broaded context of flavor compounds also contributing to the aroma of Brassica vegetables.
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Affiliation(s)
- Martyna N Wieczorek
- a Faculty of Food Science and Nutrition , Poznan University of Life Sciences , Poznan , Poland
| | - Michał Walczak
- b Institute of Human Genetics , Polish Academy of Science , Poznan , Poland
| | | | - Henryk H Jeleń
- a Faculty of Food Science and Nutrition , Poznan University of Life Sciences , Poznan , Poland
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29
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Genetic variation in bitter taste receptor gene TAS2R38, PROP taster status and their association with body mass index and food preferences in Indian population. Gene 2017; 627:363-368. [PMID: 28652185 DOI: 10.1016/j.gene.2017.06.047] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 06/05/2017] [Accepted: 06/22/2017] [Indexed: 12/24/2022]
Abstract
Polymorphisms in bitter taste receptor gene TAS2R38 alter the ability to sense the intensity of bitterness of phenylthiocarbamide (PTC) and 6-n-propylthiouracil (PROP). Genetic variation in sensitivity towards PTC and PROP may affect food preferences and susceptibility to certain diseases. This is the first study aimed at investigating frequency and distribution of TAS2R38 haplotypes in an Indian cohort. Additionally, we studied the association of TAS2R38 and PROP taster status with BMI and food preference. Three hundred and ninety three healthy adults who were 19-55years of age were selected as a convenience sample from 4 geographical regions of India. Single nucleotide polymorphisms (SNPs) of TAS2R38 (rs713598, s1726866 and rs10246939) were analyzed using polymerase chain reaction-restriction fragment length polymorphism. The prevalence of PAV/PAV diplotype was 9.9% and that of AVI/AVI diplotype was 43.76% among this Indian population. PROP status was determined on the basis of its threshold concentration of detecting bitterness, as evaluated by one-solution test. The PROP status revealed 25.95% supertasters, 32.06% medium tasters and 41.98% non-tasters (NT). BMI neither significantly (p>0.05) correlated with TAS2R38 genotypes nor with PROP taster status. Food preferences did not significantly (p>0.05) correlate with TAS2R38 diplotypes or PROP phenotypes.
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30
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Choi JH, Lee J, Yang S, Kim J. Genetic variations in taste perception modify alcohol drinking behavior in Koreans. Appetite 2017; 113:178-186. [DOI: 10.1016/j.appet.2017.02.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 02/15/2017] [Accepted: 02/17/2017] [Indexed: 12/24/2022]
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31
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Taste Receptors Mediate Sinonasal Immunity and Respiratory Disease. Int J Mol Sci 2017; 18:ijms18020437. [PMID: 28218655 PMCID: PMC5343971 DOI: 10.3390/ijms18020437] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 02/11/2017] [Accepted: 02/12/2017] [Indexed: 02/07/2023] Open
Abstract
The bitter taste receptor T2R38 has been shown to play a role in the pathogenesis of chronic rhinosinusitis (CRS), where the receptor functions to enhance upper respiratory innate immunity through a triad of beneficial immune responses. Individuals with a functional version of T2R38 are tasters for the bitter compound phenylthiocarbamide (PTC) and exhibit an anti-microbial response in the upper airway to certain invading pathogens, while those individuals with a non-functional version of the receptor are PTC non-tasters and lack this beneficial response. The clinical ramifications are significant, with the non-taster genotype being an independent risk factor for CRS requiring surgery, poor quality-of-life (QOL) improvements post-operatively, and decreased rhinologic QOL in patients with cystic fibrosis. Furthermore, indirect evidence suggests that non-tasters also have a larger burden of biofilm formation. This new data may influence the clinical management of patients with infectious conditions affecting the upper respiratory tract and possibly at other mucosal sites throughout the body.
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32
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Lipchock SV, Spielman AI, Mennella JA, Mansfield CJ, Hwang LD, Douglas JE, Reed DR. Caffeine Bitterness is Related to Daily Caffeine Intake and Bitter Receptor mRNA Abundance in Human Taste Tissue. Perception 2017; 46:245-256. [PMID: 28118781 DOI: 10.1177/0301006616686098] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We investigated whether the abundance of bitter receptor mRNA expression from human taste papillae is related to an individual's perceptual ratings of bitter intensity and habitual intake of bitter drinks. Ratings of the bitterness of caffeine and quinine and three other bitter stimuli (urea, propylthiouracil, and denatonium benzoate) were compared with relative taste papilla mRNA abundance of bitter receptors that respond to the corresponding bitter stimuli in cell-based assays ( TAS2R4, TAS2R10, TAS2R38, TAS2R43, and TAS2R46). We calculated caffeine and quinine intake from a food frequency questionnaire. The bitterness of caffeine was related to the abundance of the combined mRNA expression of these known receptors, r = 0.47, p = .05, and self-reported daily caffeine intake, t(18) = 2.78, p = .012. The results of linear modeling indicated that 47% of the variance among subjects in the rating of caffeine bitterness was accounted for by these two factors (habitual caffeine intake and taste receptor mRNA abundance). We observed no such relationships for quinine but consumption of its primary dietary form (tonic water) was uncommon. Overall, diet and TAS2R gene expression in taste papillae are related to individual differences in caffeine perception.
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Affiliation(s)
| | - Andrew I Spielman
- Department of Basic Science and Craniofacial Biology, College of Dentistry, New York University, NY, USA
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33
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Purba LHPS, Widayati KA, Tsutsui K, Suzuki-Hashido N, Hayakawa T, Nila S, Suryobroto B, Imai H. Functional characterization of the TAS2R38 bitter taste receptor for phenylthiocarbamide in colobine monkeys. Biol Lett 2017; 13:20160834. [PMID: 28123110 PMCID: PMC5310586 DOI: 10.1098/rsbl.2016.0834] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Accepted: 01/01/2017] [Indexed: 11/12/2022] Open
Abstract
Bitterness perception in mammals is mostly directed at natural toxins that induce innate avoidance behaviours. Bitter taste is mediated by the G protein-coupled receptor TAS2R, which is located in taste cell membranes. One of the best-studied bitter taste receptors is TAS2R38, which recognizes phenylthiocarbamide (PTC). Here we investigate the sensitivities of TAS2R38 receptors to PTC in four species of leaf-eating monkeys (subfamily Colobinae). Compared with macaque monkeys (subfamily Cercopithecinae), colobines have lower sensitivities to PTC in behavioural and in vitro functional analyses. We identified four non-synonymous mutations in colobine TAS2R38 that are responsible for the decreased sensitivity of the TAS2R38 receptor to PTC observed in colobines compared with macaques. These results suggest that tolerance to bitterness in colobines evolved from an ancestor that was sensitive to bitterness as an adaptation to eating leaves.
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Affiliation(s)
| | - Kanthi Arum Widayati
- Department of Biology, Bogor Agricultural University, West Java 16680, Indonesia
| | - Kei Tsutsui
- Molecular Biology Section, Department of Cellular and Molecular Biology, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Nami Suzuki-Hashido
- Molecular Biology Section, Department of Cellular and Molecular Biology, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Takashi Hayakawa
- Molecular Biology Section, Department of Cellular and Molecular Biology, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Sarah Nila
- Department of Biology, Bogor Agricultural University, West Java 16680, Indonesia
| | - Bambang Suryobroto
- Department of Biology, Bogor Agricultural University, West Java 16680, Indonesia
| | - Hiroo Imai
- Molecular Biology Section, Department of Cellular and Molecular Biology, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
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Bell L, Methven L, Signore A, Oruna-Concha MJ, Wagstaff C. Analysis of seven salad rocket (Eruca sativa) accessions: The relationships between sensory attributes and volatile and non-volatile compounds. Food Chem 2016; 218:181-191. [PMID: 27719896 PMCID: PMC5066371 DOI: 10.1016/j.foodchem.2016.09.076] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 09/09/2016] [Accepted: 09/12/2016] [Indexed: 11/26/2022]
Abstract
Sensory and chemical analyses were performed on accessions of rocket (Eruca sativa) to determine phytochemical influences on sensory attributes. A trained panel was used to evaluate leaves, and chemical data were obtained for polyatomic ions, amino acids, sugars and organic acids. These chemical data (and data of glucosinolates, flavonols and headspace volatiles previously reported) were used in Principal Component Analysis (PCA) to determine variables statistically important to sensory traits. Significant differences were observed between samples for polyatomic ion and amino acid concentrations. PCA revealed strong, positive correlations between glucosinolates, isothiocyanates and sulfur compounds with bitterness, mustard, peppery, warming and initial heat mouthfeel traits. The ratio between glucosinolates and sugars inferred reduced perception of bitter aftereffects. We highlight the diversity of E. sativa accessions from a sensory and phytochemical standpoint, and the potential for breeders to create varieties that are nutritionally and sensorially superior to existing ones.
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Affiliation(s)
- Luke Bell
- Department of Food & Nutritional Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6AH, UK.
| | - Lisa Methven
- Department of Food & Nutritional Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6AH, UK
| | - Angelo Signore
- Dipartimento di Scienze Agro-Ambientali e Territoriali, University of Bari, Italy
| | - Maria Jose Oruna-Concha
- Department of Food & Nutritional Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6AH, UK
| | - Carol Wagstaff
- Department of Food & Nutritional Sciences, University of Reading, Whiteknights, Reading, Berkshire RG6 6AH, UK; Centre for Food Security, University of Reading, Whiteknights, Reading, Berkshire RG6 6AH, UK
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Pawellek I, Grote V, Rzehak P, Xhonneux A, Verduci E, Stolarczyk A, Closa-Monasterolo R, Reischl E, Koletzko B. Association of TAS2R38 variants with sweet food intake in children aged 1-6 years. Appetite 2016; 107:126-134. [PMID: 27475756 DOI: 10.1016/j.appet.2016.07.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 07/21/2016] [Accepted: 07/26/2016] [Indexed: 01/28/2023]
Abstract
We aimed at studying whether genetic variants of the TAS2R38 gene are associated with energy intake from sweet tasting foods, total energy and macronutrient intake and body weight in children. Children (n = 691) from five European countries were genotyped for the first variant site rs713598 of the TAS2R38 bitter receptor gene. Three-day dietary records were obtained yearly from one to six years of age. Foods were categorized in sweet and non-sweet-tasting. Mixed models were used to describe group differences in food and nutrient intake and BMI z-score over time. TAS2R38 genotype was related to energy intake from sweet tasting foods: Children with PP and PA genotype consumed an average 83 kJ/d (95% CI 21 to 146; p = 0.009) more sweet tasting foods than children with AA genotype and a mean 56 kJ/d (95% CI 15 to 98; p = 0.007) more energy from energy dense sweet products. Intake of sweet tasting foods was lower in girls than boys and differed between countries. TAS2R38 genotype was not associated with the intake of energy, macronutrients, sugar, single food groups and BMI z-score. Despite many other factors influencing food preference and intake in children, actual intake of sweet food items is associated with TAS2R38 genotype. Children with PP or PA genotype consume more (energy dense) sweet tasting foods.
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Affiliation(s)
- Ingrid Pawellek
- Dr von Hauner Children's Hospital, Ludwig-Maximilians-University of Munich, Lindwurmstrasse 4, 80337, Munich, Germany
| | - Veit Grote
- Dr von Hauner Children's Hospital, Ludwig-Maximilians-University of Munich, Lindwurmstrasse 4, 80337, Munich, Germany
| | - Peter Rzehak
- Dr von Hauner Children's Hospital, Ludwig-Maximilians-University of Munich, Lindwurmstrasse 4, 80337, Munich, Germany
| | - Annick Xhonneux
- CHC St Vincent, Rue François Lefèbvre, 207, 4000, Liège-Rocourt, Belgium
| | - Elvira Verduci
- Department of Pediatrics, San Paolo Hospital, University of Milan, Via Antonio di Rudinì, 8, 20142, Milano, Italy
| | - Anna Stolarczyk
- Children's Memorial Health Institute, Dept. of Gastroenterology, Hepatology and Pediatrics, Al. Dzieci Polskich 20, 04-730, Warsaw, Poland
| | - Ricardo Closa-Monasterolo
- Pediatrics Research Unit, Universitat Rovira i Virgili, IISPV, C/ Sant Llorenç 21, 43201, Reus, Spain
| | - Eva Reischl
- Research Unit of Molecular Epidemiology and Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764, Neuherberg, Germany
| | - Berthold Koletzko
- Dr von Hauner Children's Hospital, Ludwig-Maximilians-University of Munich, Lindwurmstrasse 4, 80337, Munich, Germany.
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Genetic Variation in the TAS2R38 Bitter Taste Receptor and Gastric Cancer Risk in Koreans. Sci Rep 2016; 6:26904. [PMID: 27245112 PMCID: PMC4887993 DOI: 10.1038/srep26904] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 05/10/2016] [Indexed: 12/21/2022] Open
Abstract
The human TAS2R38 gene encodes a bitter taste receptor that regulates the bitterness perception and differentiation of ingested nutritional/poisonous compounds in the oral cavity and gastrointestinal tract. TAS2R38 gene variants are associated with alterations in individual sensitivity to bitter taste and food intake; hence, these genetic variants may modify the risk for diet-related diseases, including cancer. However, little is known about the association between TAS2R38 polymorphisms and gastric cancer susceptibility. The present case-control study examined the influence of TAS2R38 polymorphisms on food intake and determined whether they predict gastric cancer risk in Koreans. A total of 1,580 subjects, including 449 gastric cancer cases, were genotyped for TAS2R38 A49P, V262A, I296V and diplotypes. Dietary data were analysed to determine the total consumption of energy, fibre, vegetables, fruits, sweets, fats, alcohol and cigarettes. TAS2R38 diplotype was not associated with food, alcohol or cigarette consumption, either independent or dependent of gastric cancer phenotype. However, the PAV/AVI diplotype significantly increased gastric cancer risk (adjusted odds ratio: 1.513; 95% confidence interval: 1.148–1.994) independent of dietary intake. Findings suggest that TAS2R38 may be associated with the risk for gastric cancer in Koreans, although the TAS2R38 diplotype did not influence dietary intake.
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Keller KL, Adise S. Variation in the Ability to Taste Bitter Thiourea Compounds: Implications for Food Acceptance, Dietary Intake, and Obesity Risk in Children. Annu Rev Nutr 2016; 36:157-82. [PMID: 27070900 DOI: 10.1146/annurev-nutr-071715-050916] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The ability to taste bitter thiourea compounds, such as phenylthiocarbamide (PTC) and 6-n-propylthiouracil (PROP), is inherited. Polymorphisms in the bitter-taste receptor TAS2R38 explain the majority of phenotypic variation in the PROP phenotype. It has been hypothesized that the PROP phenotype is a marker for perception of a variety of chemosensory experiences. In this review, we discuss studies that have investigated the relationship between bitter-taste response and dietary behaviors and chronic health in children. Investigators have hypothesized that children who are PROP tasters have lower liking and consumption of bitter foods, such as cruciferous vegetables. Additionally, several studies suggest that children who are unable to taste PROP (i.e., nontasters) like and consume more dietary fat and are prone to obesity. The relationship between the PROP phenotype and obesity is influenced by multiple confounders, including sex, food access, ethnicity, and socioeconomic status. Future studies that adjust for these variables are needed.
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Affiliation(s)
- Kathleen L Keller
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802; .,Department of Food Science, The Pennsylvania State University, University Park, Pennsylvania 16802
| | - Shana Adise
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802;
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Wölfle U, Elsholz FA, Kersten A, Haarhaus B, Schumacher U, Schempp CM. Expression and Functional Activity of the Human Bitter Taste Receptor TAS2R38 in Human Placental Tissues and JEG-3 Cells. Molecules 2016; 21:306. [PMID: 26950109 PMCID: PMC6273027 DOI: 10.3390/molecules21030306] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 02/24/2016] [Accepted: 02/26/2016] [Indexed: 01/01/2023] Open
Abstract
Bitter taste receptors (TAS2Rs) are expressed in mucous epithelial cells of the tongue but also outside the gustatory system in epithelial cells of the colon, stomach and bladder, in the upper respiratory tract, in the cornified squamous epithelium of the skin as well as in airway smooth muscle cells, in the testis and in the brain. In the present work we addressed the question if bitter taste receptors might also be expressed in other epithelial tissues as well. By staining a tissue microarray with 45 tissue spots from healthy human donors with an antibody directed against the best characterized bitter taste receptor TAS2R38, we observed an unexpected strong TAS2R38 expression in the amniotic epithelium, syncytiotrophoblast and decidua cells of the human placenta. To analyze the functionality we first determined the TAS2R38 expression in the placental cell line JEG-3. Stimulation of these cells with diphenidol, a clinically used antiemetic agent that binds TAS2Rs including TAS2R38, demonstrated the functionality of the TAS2Rs by inducing calcium influx. Restriction enzyme based detection of the TAS2R38 gene allele identified JEG-3 cells as PTC (phenylthiocarbamide)-taster cell line. Calcium influx induced by PTC in JEG-3 cells could be inhibited with the recently described TAS2R38 inhibitor probenecid and proved the specificity of the TAS2R38 activation. The expression of TAS2R38 in human placental tissues points to further new functions and hitherto unknown endogenous ligands of TAS2Rs far beyond bitter tasting.
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Affiliation(s)
- Ute Wölfle
- Department of Dermatology, University Medical Center, Freiburg 79104, Germany.
| | - Floriana A Elsholz
- Department of Pharmacology, Biocenter, Goethe-University, Frankfurt 60438, Germany.
| | - Astrid Kersten
- Dermatohistological Laboratory Dr.Laaff, Freiburg 79111, Germany.
| | - Birgit Haarhaus
- Department of Dermatology, University Medical Center, Freiburg 79104, Germany.
| | - Udo Schumacher
- Department of Anatomy and Experimental Morphology, University Medical Center Hamburg-Eppendorf (UKE), Hamburg 20246, Germany.
| | - Christoph M Schempp
- Department of Dermatology, University Medical Center, Freiburg 79104, Germany.
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Devillier P, Naline E, Grassin-Delyle S. The pharmacology of bitter taste receptors and their role in human airways. Pharmacol Ther 2015; 155:11-21. [PMID: 26272040 DOI: 10.1016/j.pharmthera.2015.08.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The receptors involved in bitter taste perception (bitter taste receptors--T2Rs) constitute a family of G-protein-coupled receptors, of which around 29 subtypes have been identified in humans. T2R expression was initially thought to be confined to the oral cavity but has recently been described in a range of other tissues (such as the heart, gut, nasal cavity and lungs) and cell types (chemosensory, smooth muscle, endothelial, epithelial and inflammatory cells). Although it is still not clear whether endogenous T2R agonists exist, the T2R receptors recognize many natural and synthetic compounds, such as the acyl-homoserine lactones produced by bacteria, caffeine, chloroquine, and erythromycin. In the upper airways, T2Rs are involved in neurogenic inflammation and bacterial clearance. Their known effects in the lungs are exerted at three different levels. Firstly, T2R agonists increase the beating frequency of cilia on epithelial cells. Secondly, the T2Rs induce bronchial smooth muscle cells to relax. Thirdly, the T2R receptors expressed on immune cells (such as macrophages and mast cells) modulate production of pro-inflammatory mediators. Furthermore, T2R agonists are effective in inhibiting lung inflammation or smooth muscle contraction in ex vivo and asthma animal models, and are known to be involved in bacterial killing in the nasal cavity and enhancing lung function in humans. This review focuses on the pharmacology and physiological functions of T2R receptors in the upper and lower airways. It presents recently acquired knowledge suggesting that T2Rs may become valuable drug targets in the treatment of diseases such as asthma and chronic rhinosinusitis.
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Affiliation(s)
- Philippe Devillier
- Laboratoire de Pharmacologie, UPRES EA220, Hôpital Foch, 11 rue Guillaume Lenoir, 92150 Suresnes, France; Université Versailles Saint Quentin en Yvelines, UFR Sciences de la Santé, 2 avenue de la source de la Bièvre, 78180 Montigny-le-Bretonneux, France
| | - Emmanuel Naline
- Laboratoire de Pharmacologie, UPRES EA220, Hôpital Foch, 11 rue Guillaume Lenoir, 92150 Suresnes, France; Université Versailles Saint Quentin en Yvelines, UFR Sciences de la Santé, 2 avenue de la source de la Bièvre, 78180 Montigny-le-Bretonneux, France
| | - Stanislas Grassin-Delyle
- Laboratoire de Pharmacologie, UPRES EA220, Hôpital Foch, 11 rue Guillaume Lenoir, 92150 Suresnes, France; Université Versailles Saint Quentin en Yvelines, UFR Sciences de la Santé, 2 avenue de la source de la Bièvre, 78180 Montigny-le-Bretonneux, France.
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40
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Beckett EL, Martin C, Yates Z, Veysey M, Duesing K, Lucock M. Bitter taste genetics--the relationship to tasting, liking, consumption and health. Food Funct 2015; 5:3040-54. [PMID: 25286017 DOI: 10.1039/c4fo00539b] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Bitter is the most complex of human tastes, and is arguably the most important. Aversion to bitter taste is important for detecting toxic compounds in food; however, many beneficial nutrients also taste bitter and these may therefore also be avoided as a consequence of bitter taste. While many polymorphisms in TAS2R genes may result in phenotypic differences that influence the range and sensitivity of bitter compounds detected, the full extent to which individuals differ in their abilities to detect bitter compounds remains unknown. Simple logic suggests that taste phenotypes influence food preferences, intake and consequently health status. However, it is becoming clear that genetics only plays a partial role in predicting preference, intake and health outcomes, and the complex, pleiotropic relationships involved are yet to be fully elucidated.
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Affiliation(s)
- Emma L Beckett
- School of Environmental and Life Sciences, University of Newcastle, Brush Rd, Ourimbah, NSW 2258, Australia.
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41
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Hayes JE, Feeney EL, Nolden AA, McGeary JE. Quinine Bitterness and Grapefruit Liking Associate with Allelic Variants in TAS2R31. Chem Senses 2015; 40:437-43. [PMID: 26024668 DOI: 10.1093/chemse/bjv027] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Multiple psychophysical gene-association studies suggest a single nucleotide polymorphism (SNP) within the bitter receptor gene TAS2R19 on chromosome 12 may be functional. Previously, the Arg299Cys SNP (rs10772420) has been associated with differential bitterness of quinine and differential liking for grapefruit juice. However, quinine does not activate TAS2R19 in vitro; likewise, limonin and naringin, bitter compounds in grapefruit, do not activate TAS2R19 in vitro. Here, we examined quinine bitterness (whole-mouth swish-and-spit stimuli and regionally delivered quinine across 4 loci) and remembered liking for grapefruit juice to test whether they associate with SNPs in another nearby gene, TASR2R31. We observed SNP-phenotype associations between whole-mouth quinine bitterness and self-reported liking for grapefruit juice with SNPs in TAS2R31, and regional quinine bitterness followed a similar trend, but did not reach significance. Present data provide independent replication of prior associations reported for TAS2R19. However, we also observed strong linkage disequilibrium (LD) between TAS2R19 and TAS2R31 SNPs. When present data are considered in light of existing functional expression data, this suggests phenotypic associations reported previously for rs10772420 may potentially be due to LD between this SNP and polymorphism(s) in, or closer to, TAS2R31. If confirmed, this would reduce the number of TAS2Rs with putatively functional polymorphisms to 5.
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Affiliation(s)
- John E Hayes
- Sensory Evaluation Center, Department of Food Science, College of Agricultural Sciences, The Pennsylvania State University, University Park, PA 16802, USA,
| | - Emma L Feeney
- Sensory Evaluation Center, Department of Food Science, College of Agricultural Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Alissa A Nolden
- Sensory Evaluation Center, Department of Food Science, College of Agricultural Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - John E McGeary
- Providence Veterans Affairs Medical Center, Providence, RI 02908, USA, Division of Behavior Genetics, Rhode Island Hospital and Center for Alcohol and Addiction Studies, Brown University, Providence, RI 02912, USA
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42
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Di Pizio A, Niv MY. Promiscuity and selectivity of bitter molecules and their receptors. Bioorg Med Chem 2015; 23:4082-91. [PMID: 25934224 DOI: 10.1016/j.bmc.2015.04.025] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 04/04/2015] [Accepted: 04/08/2015] [Indexed: 12/11/2022]
Abstract
Bitter taste is essential for survival, as it protects against consuming poisonous compounds, which are often bitter. Bitter taste perception is mediated by bitter taste receptors (TAS2Rs), a subfamily of G-protein coupled receptors (GPCRs). The number of TAS2R subtypes is species-dependent, and varies from 3 in chicken to 50 in frog. TAS2Rs present an intriguing case for studying promiscuity: some of the receptors are still orphan, or have few known agonists, while others can be activated by numerous, structurally dissimilar compounds. The ligands also vary in the repertoire of TAS2Rs that they activate: some bitter compounds are selective toward a single TAS2R, while others activate multiple TAS2Rs. Selectivity/promiscuity profile of bitter taste receptors and their compounds was explored by a chemoinformatic approach. TAS2R-promiscuous and TAS2R-selective bitter molecules were found to differ in chemical features, such as AlogP, E-state, total charge, number of rings, globularity, and heavy atom count. This allowed the prediction of bitter ligand selectivity toward TAS2Rs. Interestingly, while promiscuous TAS2Rs are activated by both TAS2R-promiscuous and TAS2R-selective compounds, almost all selective TAS2Rs in human are activated by promiscuous compounds, which are recognized by other TAS2Rs anyway. Thus, unique ligands, that may have been the evolutionary driving force for development of selective TAS2Rs, still need to be unraveled.
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Affiliation(s)
- Antonella Di Pizio
- Institute of Biochemistry, Food Science and Nutrition, Robert H Smith Faculty of Agriculture Food and Environment, The Hebrew University, Rehovot 76100, Israel; Fritz Haber Center for Molecular Dynamics, The Hebrew University, Jerusalem 91904, Israel
| | - Masha Y Niv
- Institute of Biochemistry, Food Science and Nutrition, Robert H Smith Faculty of Agriculture Food and Environment, The Hebrew University, Rehovot 76100, Israel; Fritz Haber Center for Molecular Dynamics, The Hebrew University, Jerusalem 91904, Israel.
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Oncken C, Feinn R, Covault J, Duffy V, Dornelas E, Kranzler HR, Sankey HZ. Genetic Vulnerability to Menthol Cigarette Preference in Women. Nicotine Tob Res 2015; 17:1416-20. [PMID: 25832883 DOI: 10.1093/ntr/ntv042] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 02/09/2015] [Indexed: 12/14/2022]
Abstract
BACKGROUND Smokers may prefer menthol cigarettes to mask the bitter taste of nicotine. Variation in the taste receptor gene, TAS2R38, may contribute to preference for menthol cigarettes. AIMS To determine whether two common haplotypes of TAS2R38 (proline-alanine-valine [PAV] and alanine-valine-isoleucine [AVI]), which have been associated, respectively, with bitter taste or a lack of bitter taste produced by propylthiouracil, are associated with preference for menthol cigarettes. METHODS Data on smoking and blood for DNA extraction and genotyping were obtained from 323 pregnant non-Hispanic or Hispanic Caucasian smokers. We genotyped three TAS2R38 single nucleotide polymorphisms (rs713598, rs1726866, and rs10246939) and constructed haplotypes. We examined associations between menthol preference and the frequency and distribution of the AVI and PAV haplotypes among study participants. RESULTS Participants smoked an average of 16 cigarettes per day before pregnancy. The PAV and AVI haplotype frequencies were 48% and 45%, respectively. Non-Hispanic women were less likely than Hispanic women to smoke menthol cigarettes. As hypothesized, the frequency of the PAV haplotype was greater in menthol than non-menthol smokers in both non-Hispanics (54% vs. 30%; χ(2) = 13.04, P < .001) and Hispanics (53% vs. 25%; χ(2) = 5.77, P = .016). This effect persisted after controlling for potential confounders in multivariate logistic regression. Menthol smokers had a greater number of PAV haplotypes/individual than non-menthol smokers [non-Hispanics odds ratio (OR) = 3.02 (1.56-5.85); P = .001; Hispanics OR = 3.60 (1.23-10.56); P = .020]. CONCLUSIONS These preliminary data support the hypothesis that a genetic propensity to experience heightened bitter taste perception increases the preference for menthol cigarettes.
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Affiliation(s)
- Cheryl Oncken
- Department of Medicine and Obstetrics and Gynecology, University of Connecticut School of Medicine, Farmington, CT;
| | - Richard Feinn
- Department of Medical Sciences, Frank H. Netter MD School of Medicine, Quinnipiac University, Hamden, CT
| | - Jonathan Covault
- Department of Psychiatry, University of Connecticut School of Medicine, Farmington, CT
| | - Valerie Duffy
- Department of Allied Health Sciences, Allied Health Sciences, College of Agriculture and Natural Resources, University of Connecticut, Storrs, CT
| | - Ellen Dornelas
- Division of Oncology, Department of Medicine, Hartford Hospital, Hartford, CT; Department of Medicine, University of Connecticut School of Medicine, Farmington, CT
| | - Henry R Kranzler
- Department of Psychiatry, University of Pennsylvania Perelman School of Medicine and Philadelphia VAMC, Philadelphia, PA
| | - Heather Z Sankey
- Department of Obstetrics and Gynecology, Baystate Medical Center, Springfield, MA
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Filiptsova O, Timoshyna I, Kobets YN, Kobets M, Burlaka I, Hurko I. The population structure of Ukraine in relation to the phenylthiocarbamide sensitivity. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2015. [DOI: 10.1016/j.ejmhg.2014.12.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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45
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Roland WSU, Sanders MPA, van Buren L, Gouka RJ, Gruppen H, Vincken JP, Ritschel T. Snooker structure-based pharmacophore model explains differences in agonist and blocker binding to bitter receptor hTAS2R39. PLoS One 2015; 10:e0118200. [PMID: 25729848 PMCID: PMC4346584 DOI: 10.1371/journal.pone.0118200] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 12/06/2014] [Indexed: 11/18/2022] Open
Abstract
The human bitter taste receptor hTAS2R39 can be activated by many dietary (iso)flavonoids. Furthermore, hTAS2R39 activity can be blocked by 6-methoxyflavanones, 4'-fluoro-6-methoxyflavanone in particular. A structure-based pharmacophore model of the hTAS2R39 binding pocket was built using Snooker software, which has been used successfully before for drug design of GPCRs of the rhodopsin subfamily. For the validation of the model, two sets of compounds, both of which contained actives and inactives, were used: (i) an (iso)flavonoid-dedicated set, and (ii) a more generic, structurally diverse set. Agonists were characterized by their linear binding geometry and the fact that they bound deeply in the hTAS2R39 pocket, mapping the hydrogen donor feature based on T5.45 and N3.36, analogues of which have been proposed to play a key role in activation of GPCRs. Blockers lack hydrogen-bond donors enabling contact to the receptor. Furthermore, they had a crooked geometry, which could sterically hinder movement of the TM domains upon receptor activation. Our results reveal characteristics of hTAS2R39 agonist and bitter blocker binding, which might facilitate the development of blockers suitable to counter the bitterness of dietary hTAS2R39 agonists in food applications.
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Affiliation(s)
- Wibke S. U. Roland
- Laboratory of Food Chemistry, Wageningen University, 6708 WG Wageningen, The Netherlands
| | - Marijn P. A. Sanders
- Computational Discovery and Design Group (CDD), Centre for Molecular and Biomolecular Informatics (CMBI), Radboud university medical center, 6500 HB Nijmegen, The Netherlands
| | | | | | - Harry Gruppen
- Laboratory of Food Chemistry, Wageningen University, 6708 WG Wageningen, The Netherlands
| | - Jean-Paul Vincken
- Laboratory of Food Chemistry, Wageningen University, 6708 WG Wageningen, The Netherlands
| | - Tina Ritschel
- Computational Discovery and Design Group (CDD), Centre for Molecular and Biomolecular Informatics (CMBI), Radboud university medical center, 6500 HB Nijmegen, The Netherlands
- * E-mail:
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Shafaie Y, Hoffman DJ, Tepper BJ. Consumption of a high-fat soup preload leads to differences in short-term energy and fat intake between PROP non-taster and super-taster women. Appetite 2015; 89:196-202. [PMID: 25675856 DOI: 10.1016/j.appet.2015.02.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 01/29/2015] [Accepted: 02/03/2015] [Indexed: 10/24/2022]
Abstract
Taste blindness to the bitterness of PROP (6-n-propylthiouracil) has been used as a genetic marker for food selection and adiposity. We have shown that PROP non-taster (NT) women have higher BMIs and habitually consume more fat and energy than either medium-taster (MT) or super-taster (ST) women. These data imply that differences in dietary selection underlie the body weight differences among PROP taster groups. However, no studies investigated energy compensation in women classified by PROP status. We investigated if NTs would compensate less accurately for the calories and fat in a high-fat soup preload in a subsequent test meal compared to MTs and STs. Energy intake from a buffet meal was measured in 75 healthy non-diet-restrained, lean women 30 min after the ingestion of a high-fat soup preload (0.8 kcal/g; 55% calories from fat), calculated to represent 10% of resting energy expenditure for each subject, or the same volume of water. Subjects (n = 20-28/taster group) ate a standard breakfast followed 3 hr later by an ad-libitum buffet lunch, on two occasions. There were no differences in energy intake or macronutrient selection across taster groups after water. After soup, NTs consumed more energy than STs. Fat intake (as %-energy) was higher in NTs (46.4% ± 2.4) compared to either MTs (36.1 ± 1.9%) or STs (38.1% ± 2.3; p < 0.05). NTs overate by 11% ± 5 after the soup compared to MTs and STs who underrate by 16% ± 6 and 26% ± 10, respectively (p < 0.01). These data suggest that small discrepancies in short-term energy compensation and selection of fat after a mixed-nutrient, high-fat preload may play a role in positive energy balance and increased adiposity in women with the PROP non-taster phenotype.
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Affiliation(s)
- Yasmine Shafaie
- Department of Food Science, School of Environmental and Biological Sciences, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901-0231, United States
| | - Daniel J Hoffman
- Department of Nutritional Sciences, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, NJ, United States
| | - Beverly J Tepper
- Department of Food Science, School of Environmental and Biological Sciences, Rutgers University, 65 Dudley Road, New Brunswick, NJ 08901-0231, United States.
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Malki A, Fiedler J, Fricke K, Ballweg I, Pfaffl MW, Krautwurst D. Class I odorant receptors, TAS1R and TAS2R taste receptors, are markers for subpopulations of circulating leukocytes. J Leukoc Biol 2015; 97:533-45. [PMID: 25624459 DOI: 10.1189/jlb.2a0714-331rr] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Our cellular immune system has to cope constantly with foodborne substances that enter the bloodstream postprandially. Here, they may activate leukocytes via specific but yet mostly unknown receptors. Ectopic RNA expression out of gene families of chemosensory receptors, i.e., the ∼400 ORs, ∼25 TAS2R bitter-taste receptors, and the TAS1R umami- and sweet-taste receptor dimers by which we typically detect foodborne substances, has been reported in a variety of peripheral tissues unrelated to olfaction or taste. In the present study, we have now discovered, by gene-specific RT-PCR experiments, the mRNA expression of most of the Class I ORs (TAS1R) and TAS2R in 5 different types of blood leukocytes. Surprisingly, we did not detect Class II OR mRNA. By RT-qPCR, we show the mRNA expression of human chemosensory receptors and their cow orthologs in PMN, thus suggesting an evolutionary concept. By immunocytochemistry, we demonstrate that some olfactory and taste receptors are expressed, on average, in 40-60% of PMN and T or B cells and largely coexpress in the same subpopulation of PMN. The mRNA expression and the size of subpopulations expressing certain chemosensory receptors varied largely among individual blood samples, suggesting a regulated expression of olfactory and taste receptors in these cells. Moreover, we show mRNA expression of their downstream signaling molecules and demonstrate that PTX abolishes saccharin- or 2-PEA-induced PMN chemotactic migration, indicating a role for Gi-type proteins. In summary, our data suggest "chemosensory"-type subpopulations of circulating leukocytes.
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Affiliation(s)
- Agne Malki
- *Deutsche Forschungsanstalt für Lebensmittelchemie Leibniz Institute, Freising, Germany; and Technische Universität München, Lehrstuhl für Physiologie-Wissenschaftszentrum Weihenstephan, Freising, Germany
| | - Julia Fiedler
- *Deutsche Forschungsanstalt für Lebensmittelchemie Leibniz Institute, Freising, Germany; and Technische Universität München, Lehrstuhl für Physiologie-Wissenschaftszentrum Weihenstephan, Freising, Germany
| | - Kristina Fricke
- *Deutsche Forschungsanstalt für Lebensmittelchemie Leibniz Institute, Freising, Germany; and Technische Universität München, Lehrstuhl für Physiologie-Wissenschaftszentrum Weihenstephan, Freising, Germany
| | - Ines Ballweg
- *Deutsche Forschungsanstalt für Lebensmittelchemie Leibniz Institute, Freising, Germany; and Technische Universität München, Lehrstuhl für Physiologie-Wissenschaftszentrum Weihenstephan, Freising, Germany
| | - Michael W Pfaffl
- *Deutsche Forschungsanstalt für Lebensmittelchemie Leibniz Institute, Freising, Germany; and Technische Universität München, Lehrstuhl für Physiologie-Wissenschaftszentrum Weihenstephan, Freising, Germany
| | - Dietmar Krautwurst
- *Deutsche Forschungsanstalt für Lebensmittelchemie Leibniz Institute, Freising, Germany; and Technische Universität München, Lehrstuhl für Physiologie-Wissenschaftszentrum Weihenstephan, Freising, Germany
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Robino A, Mezzavilla M, Pirastu N, Dognini M, Tepper BJ, Gasparini P. A population-based approach to study the impact of PROP perception on food liking in populations along the Silk Road. PLoS One 2014; 9:e91716. [PMID: 24626196 PMCID: PMC3953580 DOI: 10.1371/journal.pone.0091716] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 02/14/2014] [Indexed: 12/15/2022] Open
Abstract
Taste is one of the main factors determining food choices. Differences in PROP bitter taste perception have been implicated in individual differences in food preferences and selection. The present study examined associations between, PROP phenotypes, self-reported food liking and TAS2R38 polymorphisms, the major gene implicated in PROP bitterness, in six different populations of the Caucasus and Central Asia, located along the ancient Silk Road. Differences in the distribution of PROP phenotypes across populations were detected, with a higher frequency of super tasters in Tajikistan (31.3%) and Armenia (39.0%) and a higher frequency of non tasters in Georgia (50.9%). While no relationships were observed between PROP phenotypes and food liking using standard statistical tests, we used an approach based on comparison of distance matrices derived from these data. The first matrix compared the food liking ratings of each population to all others pairwise using the Kruskal-Wallis test (at p<0.00063), and the second one compared the distribution of PROP phenotypes across all populations in a similar manner calculating the chi-square statistic as a distance measure. A strong correlation between the two matrices was found (Mantel test: r = 0.67, p-value = 0.03), suggesting that the pattern of food liking across populations was closely related to the distribution of PROP phenotypes. This same relationship was not observed when TAS2R38 genotypes were substituted for PROP phenotypes in this analysis. Our data suggest that a population-based approach utilizing distance matrices is a useful technique for detecting PROP-related differences in food liking and can be applied to other taste phenotypes.
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Affiliation(s)
- Antonietta Robino
- Institute for Maternal and Child Health - IRCCS “Burlo Garofolo”, Trieste, Italy
- University of Trieste, Trieste, Italy
- * E-mail:
| | - Massimo Mezzavilla
- Institute for Maternal and Child Health - IRCCS “Burlo Garofolo”, Trieste, Italy
- University of Trieste, Trieste, Italy
| | - Nicola Pirastu
- Institute for Maternal and Child Health - IRCCS “Burlo Garofolo”, Trieste, Italy
- University of Trieste, Trieste, Italy
| | | | - Beverly J. Tepper
- Department of Food Science, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey, United States of America
| | - Paolo Gasparini
- Institute for Maternal and Child Health - IRCCS “Burlo Garofolo”, Trieste, Italy
- University of Trieste, Trieste, Italy
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Lipchock SV, Mennella JA, Spielman AI, Reed DR. Human bitter perception correlates with bitter receptor messenger RNA expression in taste cells. Am J Clin Nutr 2013; 98:1136-43. [PMID: 24025627 PMCID: PMC3778862 DOI: 10.3945/ajcn.113.066688] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Alleles of the receptor gene TAS2R38 are responsible in part for the variation in bitter taste perception of 6-n-propylthiouracil (PROP) and structurally similar compounds (eg, glucosinolates in cruciferous vegetables). At low concentrations, people with the PAV ("taster" amino acid sequence) form of TAS2R38 perceive these bitter compounds, whereas most with the AVI ("nontaster" amino acid sequence) form do not; heterozygotes (PAV/AVI) show the widest range of bitter perception. OBJECTIVES The objectives were to examine individual differences in expression of PAV-TAS2R38 messenger RNA (mRNA) among heterozygotes, to test the hypotheses that the abundance of allele-specific gene expression accounts for the variation in human bitter taste perception, and to relate to dietary intake of bitter-tasting beverages and foods. DESIGN Heterozygous individuals (n = 22) provided psychophysical evaluation of the bitterness of PROP, glucosinolate-containing broccoli juice, non-glucosinolate-containing carrot juice, and several bitter non-TAS2R38 ligands as well as dietary recalls. Fungiform taste papillae were examined for allele-specific TAS2R38 expression by using quantitative polymerase chain reaction. RESULTS PAV-TAS2R38 mRNA expression was measured in 18 of 22 heterozygous subjects. Relative expression varied widely and positively correlated with ratings of bitterness intensity of PROP (P = 0.007) and broccoli juice (P = 0.004) but not of the control solutions carrot juice (P = 0.26), NaCl (P = 0.68), caffeine (P = 0.24), or urea (P = 0.47). Expression amounts were related to self-reported recent and habitual caffeine intake (P = 0.060, P = 0.005); vegetable intake was too low to analyze. CONCLUSIONS We provide evidence that PAV-TAS2R38 expression amount correlates with individual differences in bitter sensory perception and diet. The nature of this correlation calls for additional research on the molecular mechanisms associated with some individual differences in taste perception and food intake. The trial was registered at clinicaltrials.gov as NCT01399944.
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