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Duan P, Feng X, Peng X, Wang L, Wang H, Kan J. Degradation and transformation mechanisms of pungent substances in huajiao (Zanthoxylum bungeanum) oil during storage: Induced by ultraviolet irradiation. Food Chem 2024; 455:139674. [PMID: 38824728 DOI: 10.1016/j.foodchem.2024.139674] [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: 02/16/2024] [Revised: 04/29/2024] [Accepted: 05/13/2024] [Indexed: 06/04/2024]
Abstract
The pungency of huajiao (scientifically known as Zanthoxylum bungeanum) oil (ZBO), a crucial seasoning oil, is notably influenced by storage conditions, an aspect insufficiently explored in current research. Through the use of high-performance liquid chromatography and liquid chromatography-mass spectrometry, this study systematically investigated the stability of pungent compounds in ZBO under various storage conditions. It also elucidated the degradation and transformation mechanisms of these substances when exposed to ultraviolet (UV) irradiation. The results underscore elevated temperature, light exposure, oxygen, and storage duration as pivotal factors influencing compound degradation, with UV light emerging as the primary driving force. After 48 h of UV exposure, the primary pungent compound, hydroxy-α-sanshool, experienced a significant loss of 85.49%, indicating a pronounced inclination towards isomerization and oxidation. Notably, this study reveals, for the first time, the possible degradation-transformation pattern of hydroxy-γ-sanshool: a mutual conversion with hydroxy-γ-isosanshool and isomerization to (2E,4E,8Z,10E,12Z)-N-(2-hydroxy-2-methylpropyl) tetradeca-2,4,8,10,12-pentaenamide.
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Affiliation(s)
- Ping Duan
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China; Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Chongqing 400715, PR China
| | - Xiya Feng
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China; Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Chongqing 400715, PR China
| | - Xiaowei Peng
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China; Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Chongqing 400715, PR China
| | - Lu Wang
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China; Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Chongqing 400715, PR China
| | - Hongwei Wang
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China.
| | - Jianquan Kan
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China; Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Chongqing 400715, PR China.
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2
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Li G, Wang X, Wang Q, Han L, Bai J, Wang F, Yu B, Liu Z, Long X, Cheng Y. Coumarins rather than alkylamides evoke the numbing orosensation of pomelo peel. Food Chem 2024; 463:141502. [PMID: 39368197 DOI: 10.1016/j.foodchem.2024.141502] [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: 07/27/2024] [Revised: 09/20/2024] [Accepted: 09/29/2024] [Indexed: 10/07/2024]
Abstract
Liangpingyou, a well-known Chinese pomelo (Citrus grandis L.) variety, elicits a unique and uncharacterized numbing aftertaste. To understand the molecular bases and characteristics of the pomelo-induced numbing sensation, we first determined that hydroxyl sanshools, the major Sichuan pepper chemosensates, were not responsible via silylation-GC-MS analysis. Pomelo peel juice was then subjected to solid-phase extraction to form 4 fractions, and key sensory-active substances were screened via taste dilution analysis. Three simple coumarins, meranzin hydrate, isomeranzin, and marmin, were identified to induce numbing, which has not been previously reported. Sensory studies via extensively modified half-tongue tests and verification steps revealed recognition thresholds within 0.49-1.78, 0.32-1.56, and 0.43-1.46 μmol/L for numbness, pungency, and astringency, respectively. The temporal dominance trends showed the following taste notes: Meranzin hydrate-numbing dominated, isomeranzin-numbing and pungent, and marmin-astringent and numbing. Molecular docking analysis suggested that coumarins target the receptors TRPV1, TPRA1, and KCNK3.
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Affiliation(s)
- Guijie Li
- Citrus Research Institute, Southwest University, Chongqing, 400712, China; National Citrus Engineering Research Center, Chongqing, 400712, China.
| | - Xuting Wang
- Citrus Research Institute, Southwest University, Chongqing, 400712, China
| | - Qundi Wang
- Citrus Research Institute, Southwest University, Chongqing, 400712, China.
| | - Leng Han
- Citrus Research Institute, Southwest University, Chongqing, 400712, China; National Citrus Engineering Research Center, Chongqing, 400712, China.
| | - Junying Bai
- Citrus Research Institute, Southwest University, Chongqing, 400712, China; National Citrus Engineering Research Center, Chongqing, 400712, China.
| | - Fusheng Wang
- Citrus Research Institute, Southwest University, Chongqing, 400712, China; National Citrus Engineering Research Center, Chongqing, 400712, China.
| | - Bo Yu
- Sichuan Dan Orange Modern Fruit Industry Co., Ltd, Danling, 620200, China
| | - Zhaojun Liu
- Chongqing Liangping District Agriculture and Rural Committee, Chongqing, 405200, China
| | - Xingyao Long
- Collaborative Innovation Center for Child Nutrition and Health Development, Chongqing University of Education, Chongqing, 400067, China.
| | - Yujiao Cheng
- Citrus Research Institute, Southwest University, Chongqing, 400712, China; National Citrus Engineering Research Center, Chongqing, 400712, China.
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3
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Flammer LJ, Ellis H, Rivers N, Caronia L, Ghidewon MY, Christensen CM, Jiang P, Breslin PAS, Tordoff MG. Topical application of a P2X2/P2X3 purine receptor inhibitor suppresses the bitter taste of medicines and other taste qualities. Br J Pharmacol 2024; 181:3282-3299. [PMID: 38745397 DOI: 10.1111/bph.16411] [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: 09/25/2023] [Revised: 04/01/2024] [Accepted: 04/05/2024] [Indexed: 05/16/2024] Open
Abstract
BACKGROUND AND PURPOSE Many medications taste intensely bitter. The innate aversion to bitterness affects medical compliance, especially in children. There is a clear need to develop bitter blockers to suppress the bitterness of vital medications. Bitter taste is mediated by TAS2R receptors. Because different pharmaceutical compounds activate distinct sets of TAS2Rs, targeting specific receptors may only suppress bitterness for certain, but not all, bitter-tasting compounds. Alternative strategies are needed to identify universal bitter blockers that will improve the acceptance of every medication. Taste cells in the mouth transmit signals to afferent gustatory nerve fibres through the release of ATP, which activates the gustatory nerve-expressed purine receptors P2X2/P2X3. We hypothesized that blocking gustatory nerve transmission with P2X2/P2X3 inhibitors (e.g. 5-(5-iodo-4-methoxy-2-propan-2-ylphenoxy)pyrimidine-2,4-diamine [AF-353]) would reduce bitterness for all medications and bitter compounds. EXPERIMENTAL APPROACH Human sensory taste testing and mouse behavioural analyses were performed to determine if oral application of AF-353 blocks perception of bitter taste and other taste qualities but not non-gustatory oral sensations (e.g. tingle). KEY RESULTS Rinsing the mouth with AF-353 in humans or oral swabbing it in mice suppressed the bitter taste and avoidance behaviours of all compounds tested. We further showed that AF-353 suppressed other taste qualities (i.e. salt, sweet, sour and savoury) but had no effects on other oral or nasal sensations (e.g, astringency and oral tingle). CONCLUSION AND IMPLICATIONS This is the first time a universal, reversible taste blocker in humans has been reported. Topical application of P2X2/P2X3 inhibitor to suppress bitterness may improve medical compliance.
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Affiliation(s)
- Linda J Flammer
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
| | - Hillary Ellis
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
| | - Natasha Rivers
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
| | - Lauren Caronia
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
| | - Misgana Y Ghidewon
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
- University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Peihua Jiang
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
| | - Paul A S Breslin
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
- Department of Nutritional Sciences, Rutgers University, New Brunswick, New Jersey, USA
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Jeye BM. Use of Buzz Buttons to Illustrate Taste Perception Principles in a Sensation and Perception Laboratory Exercise. JOURNAL OF UNDERGRADUATE NEUROSCIENCE EDUCATION : JUNE : A PUBLICATION OF FUN, FACULTY FOR UNDERGRADUATE NEUROSCIENCE 2024; 22:A177-A184. [PMID: 39355669 PMCID: PMC11441431 DOI: 10.59390/bclx3929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 04/27/2024] [Accepted: 05/01/2024] [Indexed: 10/03/2024]
Abstract
The buzz button is an edible flower that induces a tingling, electric sensation in the mouth and alters the perception of different flavors. The buzz button's taste-altering effect is thought to be caused by the bioactive compound spilanthol. The present article details a laboratory exercise that explores taste perception principles using the buzz button in an undergraduate Sensation and Perception course. A detailed step-by-step guide for the laboratory exercise is included along with analyzed student results. Students first sampled various food items that spanned the different taste sensations (i.e., salty, sweet, sour and bitter) and then rated their perceived taste intensity on a scale from one (not intense) to ten (very intense). Next, students consumed a buzz button and resampled each food item as well as re-rated their perceived taste intensities. It was found that students' perceived taste intensities for sour items and sweet items were decreased after consuming the buzz buttons. Additionally, students also completed a post-activity survey in which they indicated that this was an interesting and enjoyable exercise. This highlights the value of this particular hands-on demonstration in teaching about the connection between taste and tactile perception.
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Affiliation(s)
- Brittany M Jeye
- Psychology Department, Worcester State University, Worcester, MA 01602
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5
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Pergel E, Tóth DJ, Baukál D, Veres I, Czirják G. The Ubiquitin Ligase Adaptor NDFIP1 Interacts with TRESK and Negatively Regulates the Background K + Current. Int J Mol Sci 2024; 25:8879. [PMID: 39201565 PMCID: PMC11355008 DOI: 10.3390/ijms25168879] [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: 07/24/2024] [Revised: 08/11/2024] [Accepted: 08/13/2024] [Indexed: 09/02/2024] Open
Abstract
The TRESK (K2P18.1, KCNK18) background potassium channel is expressed in primary sensory neurons and has been reported to contribute to the regulation of pain sensations. In the present study, we examined the interaction of TRESK with NDFIP1 (Nedd4 family-interacting protein 1) in the Xenopus oocyte expression system by two-electrode voltage clamp and biochemical methods. We showed that the coexpression of NDFIP1 abolished the TRESK current under the condition where the other K+ channels were not affected. Mutations in the three PPxY motifs of NDFIP1, which are responsible for the interaction with the Nedd4 ubiquitin ligase, prevented a reduction in the TRESK current. Furthermore, the overexpression of a dominant-negative Nedd4 construct in the oocytes coexpressing TRESK with NDFIP1 partially reversed the down-modulating effect of the adaptor protein on the K+ current. The biochemical data were also consistent with the functional results. An interaction between epitope-tagged versions of TRESK and NDFIP1 was verified by co-immunoprecipitation experiments. The coexpression of NDFIP1 with TRESK induced the ubiquitination of the channel protein. Altogether, the results suggest that TRESK is directly controlled by and highly sensitive to the activation of the NDFIP1-Nedd4 system. The NDFIP1-mediated reduction in the TRESK component may induce depolarization, increase excitability, and attenuate the calcium dependence of the membrane potential by reducing the calcineurin-activated fraction in the ensemble background K+ current.
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Affiliation(s)
- Enikő Pergel
- Department of Physiology, Semmelweis University, 1094 Budapest, Hungary; (E.P.); (D.B.); (I.V.)
| | - Dániel J. Tóth
- Department of Physiology, Semmelweis University, 1094 Budapest, Hungary; (E.P.); (D.B.); (I.V.)
- HUN-REN-SU Molecular Physiology Research Group, Hungarian Research Network and Semmelweis University, 1094 Budapest, Hungary
| | - Dóra Baukál
- Department of Physiology, Semmelweis University, 1094 Budapest, Hungary; (E.P.); (D.B.); (I.V.)
| | - Irén Veres
- Department of Physiology, Semmelweis University, 1094 Budapest, Hungary; (E.P.); (D.B.); (I.V.)
| | - Gábor Czirják
- Department of Physiology, Semmelweis University, 1094 Budapest, Hungary; (E.P.); (D.B.); (I.V.)
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6
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Jongsma E, Grigolon G, Baumann J, Weinkove D, Ewald CY, Wandrey F, Grothe T. Timut Pepper Extract Slows Age-Dependent Decline of Mobility and Collagen Loss and Promotes Longevity. Nutrients 2024; 16:2122. [PMID: 38999870 PMCID: PMC11243454 DOI: 10.3390/nu16132122] [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: 05/22/2024] [Revised: 06/27/2024] [Accepted: 07/01/2024] [Indexed: 07/14/2024] Open
Abstract
Investigations into human longevity are increasingly focusing on healthspan enhancement, not just lifespan extension. Lifestyle modifications and nutritional choices, including food supplements, can significantly affect aging and general health. Phytochemicals in centenarians' diets, such as those found in Timut pepper, a Nepalese spice with various medicinal properties, may contribute to their longevity. Similarly, Sichuan pepper, a related species, has demonstrated anti-inflammatory and neuroprotective activities. With the broader purpose of uncovering a novel treatment to address aging and its comorbidities, this study aims to investigate the potential lifespan- and healthspan-promoting effects of Timut pepper using the model organism Caenorhabditis elegans. We show that Timut pepper extract extends C. elegans' lifespan at different maintenance temperatures and increases the proportion of active nematodes in their early adulthood. In addition, we show that Timut pepper extract enhances speed and distance moved as the nematodes age. Finally, Timut pepper extract assures extracellular matrix homeostasis by slowing the age-dependent decline of collagen expression.
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Affiliation(s)
- Elisabeth Jongsma
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, 8603 Schwerzenbach, Switzerland
| | | | - Julia Baumann
- Mibelle Group Biochemistry, Mibelle AG, 5033 Buchs, Switzerland
| | - David Weinkove
- Magnitude Biosciences Ltd., NETPark Plexus, Thomas Wright Way, Sedgefield TS21 3FD, UK
- Department of Biosciences, Durham University, Stockton Road, Durham DH1 3LE, UK
| | - Collin Y. Ewald
- Laboratory of Extracellular Matrix Regeneration, Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, 8603 Schwerzenbach, Switzerland
| | | | - Torsten Grothe
- Mibelle Group Biochemistry, Mibelle AG, 5033 Buchs, Switzerland
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7
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Torzone SK, Breen PC, Cohen NR, Simmons KN, Dowen RH. The TWK-26 potassium channel governs nutrient absorption in the C. elegans intestine. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.06.592787. [PMID: 38766028 PMCID: PMC11100751 DOI: 10.1101/2024.05.06.592787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Ion channels are necessary for proper water and nutrient absorption in the intestine, which supports cellular metabolism and organismal growth. While a role for Na + co-transporters and pumps in intestinal nutrient absorption is well defined, how individual K + uniporters function to maintain ion homeostasis is poorly understood. Using Caenorhabditis elegans , we show that a gain-of-function mutation in twk-26 , which encodes a two-pore domain K + ion channel orthologous to human KCNK3, facilitates nutrient absorption and suppresses the metabolic and developmental defects displayed by impaired intestinal MAP Kinase (MAPK) signaling. Mutations in drl-1 and flr-4, which encode two components of this MAPK pathway, cause severe growth defects, reduced lipid storage, and a dramatic increase in autophagic lysosomes, which mirror dietary restriction phenotypes. Additionally, these MAPK mutants display structural defects of the intestine and an impaired defecation motor program. We find that activation of TWK-26 reverses the dietary restriction-like state of the MAPK mutants by restoring intestinal nutrient absorption without correcting the intestinal bloating or defecation defects. This study provides unique insight into the mechanisms by which intestinal K + ion channels support intestinal metabolic homeostasis.
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8
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Qi J, Pan Z, Wang X, Zhang N, He G, Jiang X. Research advances of Zanthoxylum bungeanum Maxim. polyphenols in inflammatory diseases. Front Immunol 2024; 15:1305886. [PMID: 38343532 PMCID: PMC10853423 DOI: 10.3389/fimmu.2024.1305886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 01/08/2024] [Indexed: 02/15/2024] Open
Abstract
Zanthoxylum bungeanum Maxim., commonly known as Chinese prickly ash, is a well-known spice and traditional Chinese medicine ingredient with a rich history of use in treating inflammatory conditions. This review provides a comprehensive overview of the botanical classification, traditional applications, and anti-inflammatory effects of Z. bungeanum, with a specific focus on its polyphenolic components. These polyphenols have exhibited considerable promise, as evidenced by preclinical studies in animal models, suggesting their therapeutic potential in human inflammatory diseases such as ulcerative colitis, arthritis, asthma, chronic obstructive pulmonary disease, cardiovascular disease, and neurodegenerative conditions. This positions them as a promising class of natural compounds with the potential to enhance human well-being. However, further research is necessary to fully elucidate their mechanisms of action and develop safe and effective therapeutic applications.
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Affiliation(s)
- Jinxin Qi
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
| | - Zhaoping Pan
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
| | - Xiaoyun Wang
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
| | - Nan Zhang
- State Key Laboratory of Southwestern Chinese Medicine Resources, Hospital of Chengdu University of Traditional Chinese Medicine, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Gu He
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
| | - Xian Jiang
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
- Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
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9
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Wu Q, Yu P, Li J, Wang Y, Chen K. Mechanistic elucidation of the degradation and transformation of hydroxy-α-sanshool and its conformers as the pungent dietary components in Sichuan pepper: A DFT study. Food Chem 2024; 430:137078. [PMID: 37557032 DOI: 10.1016/j.foodchem.2023.137078] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 07/16/2023] [Accepted: 07/31/2023] [Indexed: 08/11/2023]
Abstract
To better understand the structural changes of sanshool pungent dietary components during the process and preservation of Sichuan pepper and pungent foods, the mechanistic insights into the intrinsic degradation and transformation of 16 hydroxy-α-sanshool conformers have been explored computationally. Our results have revealed that increasing the cis-CC bond numbers in the most stable all-trans hydroxy-β-sanshool structure causes the maximum 34.21 kJ/mol conformational energetic difference, and the existent probability of C2nnn would be lower than that of C1nnn (n = 1,2). The isomerization between the conformers could be much easier when they are excited by light radiation, as the strength of the CC bonds and their connected CC bonds becomes significantly close, and the relative energies among conformers are largely reduced. Besides, the different combination of cis/trans-CC bonds changes the delocalization degree of molecular Frontier orbitals, which consequently causes the different photochemical stability. Finally, the possible molecular oxidation degradation mechanism is proposed.
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Affiliation(s)
- Qingyi Wu
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China.
| | - Peiyao Yu
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China.
| | - Jiashi Li
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China.
| | - Yongtao Wang
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027, PR China.
| | - Kexian Chen
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China.
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10
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Linne BM, Tello E, Simons CT, Peterson DG. Characterization of the impact of chlorogenic acids on tactile perception in coffee through an inverse effect on mouthcoating sensation. Food Res Int 2023; 172:113167. [PMID: 37689920 DOI: 10.1016/j.foodres.2023.113167] [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: 02/16/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 09/11/2023]
Abstract
Coffee "body" is acknowledged by coffee industry professionals to be an attribute which contributes meaningfully to overall coffee quality and is defined as the collective tactile sensation imparted by the beverage. Currently, there is limited knowledge of the chemical compounds that contribute to tactile attributes in coffee. In the present work, coffee body was determined to be comprised of 4 sub-attributes including mouthcoating, astringency, chalkiness, and thickness and the specific constituents contributing to the tactile sensation of mouthcoating were further pursued using sensory-guided fractionation via preparative-scale liquid chromatography. Signal detection-based sensory methodologies were employed to characterize the sensory effects elicited by selected compounds in water and coffee matrices. Two chlorogenic acids, 3-O-caffeoylquinic acid (3-CQA) and 4-O-caffeoylquinic acid (4-CQA), were observed to impart subtle but significantly perceptible mouthcoating effects in water and/or coffee. Counterintuitively, sensory perception was inversely related to compound concentration. Complex receptor-ligand interactions or salivary lubrication dynamics are discussed as two potential mechanisms to explain this inverse relationship. Taken together, the outcomes of the present study (1) provide new targets for coffee tactile sensation optimization and modulation, (2) identify a novel dimension of sensory impact for two compounds of the chlorogenic acid family, and (3) present a need for deeper investigation into 3-CQA and 4-CQA mechanisms of sensation.
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Affiliation(s)
- Brianne M Linne
- Department of Food Science & Technology, The Ohio State University, Columbus, OH 43210-1007, USA
| | - Edisson Tello
- Department of Food Science & Technology, The Ohio State University, Columbus, OH 43210-1007, USA
| | - Christopher T Simons
- Department of Food Science & Technology, The Ohio State University, Columbus, OH 43210-1007, USA
| | - Devin G Peterson
- Department of Food Science & Technology, The Ohio State University, Columbus, OH 43210-1007, USA.
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11
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Liang Q, Wang JW, Bai YR, Li RL, Wu CJ, Peng W. Targeting TRPV1 and TRPA1: A feasible strategy for natural herbal medicines to combat postoperative ileus. Pharmacol Res 2023; 196:106923. [PMID: 37709183 DOI: 10.1016/j.phrs.2023.106923] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/16/2023]
Abstract
Under physiological or pathological conditions, transient receptor potential (TRP) channel vanilloid type 1 (TRPV1) and TRP ankyrin 1 (TRPA1) possess the ability to detect a vast array of stimuli and execute diverse functions. Interestingly, increasing works have reported that activation of TRPV1 and TRPA1 could also be beneficial for ameliorating postoperative ileus (POI). Increasing research has revealed that the gastrointestinal (GI) tract is rich in TRPV1/TRPA1, which can be stimulated by capsaicin, allicin and other compounds. This activation stimulates a variety of neurotransmitters, leading to increased intestinal motility and providing protective effects against GI injury. POI is the most common emergent complication following abdominal and pelvic surgery, and is characterized by postoperative bowel dysfunction, pain, and inflammatory responses. It is noteworthy that natural herbs are gradually gaining recognition as a potential therapeutic option for POI due to the lack of effective pharmacological interventions. Therefore, the focus of this paper is on the TRPV1/TRPA1 channel, and an analysis and summary of the processes and mechanism by which natural herbs activate TRPV1/TRPA1 to enhance GI motility and relieve pain are provided, which will lay the foundation for the development of natural herb treatments for this disease.
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Affiliation(s)
- Qi Liang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, PR China
| | - Jing-Wen Wang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, PR China
| | - Yu-Ru Bai
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, PR China
| | - Ruo-Lan Li
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, PR China
| | - Chun-Jie Wu
- Institute of Innovation, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, PR China.
| | - Wei Peng
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, PR China.
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12
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Mitani T, Yawata Y, Yamamoto N, Okuno Y, Sakamoto H, Nishide M, Kayano SI. Stabilization of Hydroxy-α-Sanshool by Antioxidants Present in the Genus Zanthoxylum. Foods 2023; 12:3444. [PMID: 37761152 PMCID: PMC10529024 DOI: 10.3390/foods12183444] [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: 07/21/2023] [Revised: 09/04/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
Japanese pepper (sansho, Zanthoxylum piperitum) contains several types of sanshools belonging to N-alkylamides. Because of the long-chain unsaturated fatty acids present in their structure, sanshools are prone to oxidative deterioration, which poses problems in processing. In this paper, we evaluated the effects of antioxidants from the genus Zanthoxylum in preventing sanshool degradation using accelerated tests. An ethanolic extract of segment membranes of the sansho fruit pericarp was incubated at 70 °C for 7 days with different antioxidants to determine the residual amount of hydroxy-α-sanshool (HαS) in the extract. α-Tocopherol (α-Toc) showed excellent HαS-stabilizing activity at low concentrations. Among phenolic acids, we noted that the HαS-stabilizing activity increased with the number of hydroxy groups per molecule. For example, gallic acid and its derivatives exhibited excellent sanshool-stabilizing activity. Quercetin was found to be a superior HαS stabilizer compared with hesperetin and naringenin. However, the effective concentration was much higher for phenolic compounds than for α-Toc. These substances are believed to play a role in preventing the decomposition of sanshools in the pericarp of sansho. These sanshool stabilizers should be useful in the development of new beverages, foods, cosmetics, and pharmaceuticals that take advantage of the taste and flavor of sansho.
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Affiliation(s)
- Takahiko Mitani
- Center of Regional Revitalization, Research Center for Food and Agriculture, Wakayama University, Wakayama 640-8510, Japan
| | - Yasuko Yawata
- Center of Regional Revitalization, Research Center for Food and Agriculture, Wakayama University, Wakayama 640-8510, Japan
| | - Nami Yamamoto
- Faculty of Education, Wakayama University, Wakayama 640-8510, Japan;
| | - Yoshiharu Okuno
- Department of Material Science, Wakayama National College of Technology, Gobo 644-0023, Japan;
| | - Hidefumi Sakamoto
- Faculty of Systems Engineering, Wakayama University, Wakayama 640-8510, Japan;
| | - Mitsunori Nishide
- Division of Food and Nutrition, Wakayama Shin-Ai Women’s Junior College, Wakayama 640-0341, Japan;
| | - Shin-ichi Kayano
- Department of Nutrition, Faculty of Health Science, Kio University, Koryo-cho, Nara 635-0832, Japan;
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13
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Han N, Sun L, Zhang J, Yuan W, Wang C, Zhao A, Wang D. Transcriptomics integrated with metabolomics to characterize key pigment compounds and genes related to anthocyanin biosynthesis in Zanthoxylum bungeanum peel. PHYSIOLOGIA PLANTARUM 2023; 175:e14031. [PMID: 37882301 DOI: 10.1111/ppl.14031] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 07/26/2023] [Accepted: 09/08/2023] [Indexed: 10/27/2023]
Abstract
Zanthoxylum bungeanum is an important condiment with high economic value and its peel color is one of the main quality indexes. However, the key pigment compounds and related genes are still unclear affecting the quality control of the plants. In this study, the contents of four types of pigments were measured in Z. bungeanum and flavonoids were identified as the most important pigments. Based on the targeted flavonoid metabolomics of Z. bungeanum peels, 14 key pigment compounds were screened out from 152 flavonoids, among which cyanidin-3-O-rutinoside and cyanidin-3-O-glucoside were the most critical compounds for peel color. They were further verified to be present in nine varieties of Z. bungeanum by HPLC fingerprints. The 14 compounds were all associated with flavonoid and anthocyanin biosynthesis pathways and the 39 differentially expressed genes related to these pathways were annotated and screened based on transcriptomics. The genes ZbDFR, ZbANS, and ZbUFGT were identified as three key genes for anthocyanin synthesis in Z. bungeanum peels. Further qRT-PCR results confirmed the reliability of transcriptomics and the accuracy of gene screening. Subsequent protein induced expression demonstrated that ZbANS and ZbUFGT were expressed after 12 h induced by IPTG while ZbDFR was expressed after 15 h. Further transient and stable transformation analysis confirmed that both anthocyanin content and the expression of ZbDFR were significantly increased in overexpression Z. bungeanum leaves and Nicotiana benthamiana. The functional effect of stable transformation of ZbDFR was more significant than that of transient transformation with a 7.67-fold/1.49-fold difference in total anthocyanin content and a 42.37-fold/12.32-fold difference in the expression of ZbDFR. This study provides new insights into the chemical composition and the molecular mechanisms of Z. bungeanum peel color and lays an effective foundation for the color quality control, multi-purpose utilization of Z. bungeanum and the creation of new germplasm.
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Affiliation(s)
- Nuan Han
- College of Forestry, Northwest A&F University, Yangling, Shaanxi, China
| | - Leiwen Sun
- College of Forestry, Northwest A&F University, Yangling, Shaanxi, China
| | - Jie Zhang
- College of Forestry, Northwest A&F University, Yangling, Shaanxi, China
| | - Wei Yuan
- College of Forestry, Northwest A&F University, Yangling, Shaanxi, China
| | - Cheng Wang
- College of Forestry, Northwest A&F University, Yangling, Shaanxi, China
| | - Aiguo Zhao
- College of Forestry, Northwest A&F University, Yangling, Shaanxi, China
| | - Dongmei Wang
- College of Forestry, Northwest A&F University, Yangling, Shaanxi, China
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14
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Li RL, Duan HX, Wang LY, Liang Q, Wu C, Peng W. Amides from Zanthoxylum bungeanum Maxim. (Rutaceae) are promising natural agents with neuroprotective activities. ARAB J CHEM 2023. [DOI: 10.1016/j.arabjc.2023.104817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023] Open
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15
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Cao A, Gao W, Sawada T, Yoshimoto RU, Aijima R, Ohsaki Y, Kido MA. Transient Receptor Potential Channel Vanilloid 1 Contributes to Facial Mechanical Hypersensitivity in a Mouse Model of Atopic Asthma. J Transl Med 2023; 103:100149. [PMID: 37059266 DOI: 10.1016/j.labinv.2023.100149] [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: 11/15/2022] [Revised: 03/22/2023] [Accepted: 03/29/2023] [Indexed: 04/16/2023] Open
Abstract
Sensitive skin, a common pathophysiological feature of allergic diseases, is defined as an unpleasant sensation in response to stimuli that normally should not provoke such sensations. However, the relationship between allergic inflammation and hypersensitive skin in the trigeminal system remains to be elucidated. To explore whether bronchial allergic inflammation affects facial skin and primary sensory neurons, we used an ovalbumin (OVA)-induced asthma mouse model. Significant mechanical hypersensitivity was observed in the facial skin of mice with pulmonary inflammation induced by OVA sensitization compared to mice treated with adjuvant or vehicle as controls. The skin of OVA-treated mice showed an increased number of nerve fibers, especially rich intraepithelial nerves, compared to controls. Transient receptor potential channel vanilloid 1 (TRPV1)-immunoreactive nerves were enriched in the skin of OVA-treated mice. Moreover, epithelial TRPV1 expression was higher in OVA-treated mice than in controls. Trigeminal ganglia of OVA-treated mice displayed larger numbers of activated microglia/macrophages and satellite glia. In addition, more TRPV1 immunoreactive neurons were found in the trigeminal ganglia of OVA-treated mice than in controls. Mechanical hypersensitivity was suppressed in OVA-treated Trpv1-deficient mice, while topical skin application of a TRPV1 antagonist before behavioral testing reduced the reaction induced by mechanical stimulation. Our findings reveal that mice with allergic inflammation of the bronchi had mechanical hypersensitivity in the facial skin that may have resulted from TRPV1-mediated neuronal plasticity and glial activation in the trigeminal ganglion.
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Affiliation(s)
- Ailin Cao
- Division of Histology and Neuroanatomy, Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga, Japan; Department of Oral Pathology, Graduate School of Dental Science, Kyushu University, Fukuoka, Japan
| | - Weiqi Gao
- Division of Histology and Neuroanatomy, Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga, Japan
| | - Takeshi Sawada
- Division of Histology and Neuroanatomy, Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga, Japan
| | - Reiko U Yoshimoto
- Division of Histology and Neuroanatomy, Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga, Japan; Department of Oral Pathology, Graduate School of Dental Science, Kyushu University, Fukuoka, Japan
| | - Reona Aijima
- Department of Oral Maxillofacial Surgery, Faculty of Medicine, Saga University, Saga, Japan
| | - Yasuyoshi Ohsaki
- Division of Histology and Neuroanatomy, Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga, Japan
| | - Mizuho A Kido
- Division of Histology and Neuroanatomy, Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga, Japan; Department of Oral Pathology, Graduate School of Dental Science, Kyushu University, Fukuoka, Japan.
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16
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Girardi G, Zumpano D, Goshi N, Raybould H, Seker E. Cultured Vagal Afferent Neurons as Sensors for Intestinal Effector Molecules. BIOSENSORS 2023; 13:601. [PMID: 37366967 DOI: 10.3390/bios13060601] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/28/2023]
Abstract
The gut-brain axis embodies the bi-directional communication between the gastrointestinal tract and the central nervous system (CNS), where vagal afferent neurons (VANs) serve as sensors for a variety of gut-derived signals. The gut is colonized by a large and diverse population of microorganisms that communicate via small (effector) molecules, which also act on the VAN terminals situated in the gut viscera and consequently influence many CNS processes. However, the convoluted in vivo environment makes it difficult to study the causative impact of the effector molecules on VAN activation or desensitization. Here, we report on a VAN culture and its proof-of-principle demonstration as a cell-based sensor to monitor the influence of gastrointestinal effector molecules on neuronal behavior. We initially compared the effect of surface coatings (poly-L-lysine vs. Matrigel) and culture media composition (serum vs. growth factor supplement) on neurite growth as a surrogate of VAN regeneration following tissue harvesting, where the Matrigel coating, but not the media composition, played a significant role in the increased neurite growth. We then used both live-cell calcium imaging and extracellular electrophysiological recordings to show that the VANs responded to classical effector molecules of endogenous and exogenous origin (cholecystokinin serotonin and capsaicin) in a complex fashion. We expect this study to enable platforms for screening various effector molecules and their influence on VAN activity, assessed by their information-rich electrophysiological fingerprints.
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Affiliation(s)
- Gregory Girardi
- Department of Biomedical Engineering, University of California-Davis, Davis, CA 95616, USA
| | - Danielle Zumpano
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, CA 95616, USA
| | - Noah Goshi
- Department of Biomedical Engineering, University of California-Davis, Davis, CA 95616, USA
| | - Helen Raybould
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, CA 95616, USA
| | - Erkin Seker
- Department of Electrical and Computer Engineering, University of California-Davis, Davis, CA 95616, USA
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17
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Feng X, Huang P, Duan P, Wang H, Kan J. Dynamic Zanthoxylum pungency characteristics and their correlation with sanshool composition and chemical structure. Food Chem 2023; 407:135138. [PMID: 36495741 DOI: 10.1016/j.foodchem.2022.135138] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/09/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022]
Abstract
Huajiao (Zanthoxylum) from different regions varies in pungency features. The objective of this study was to explore the reasons for the differences. Temporal check-all-that-apply (TCATA) and time-intensity (TI)) were used to determine time-related pungency features of huajiao and sanshools. The compositions of sanshools in huajiao were measured by high-performance liquid chromatograph (HPLC). TI results revealed that hydroxy-γ-sanshool tingling and numbing duration (1332.00 ± 50.91 and 1020.00 ± 61.19 s, respectively) were about twice that of hydroxy-α-sanshool (720.00 ± 25.92 and 584.00 ± 22.63 s, respectively). Tingling and numbing were not perceived by hydroxy-β-sanshool and hydroxy-γ-isosanshool. HPLC results showed that HαSS was the main component of huajiao sanshools, representing 71.06 % to 92.90 %. TCATA results revealed the pungency sensations appearance sequence: tingling, salivating, cooling, and burning appeared first, followed by vibrating, and numbing was perceived last. These findings revealed the relationship between the compositions of sanshool and the pungency features of huajiao.
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Affiliation(s)
- Xiya Feng
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China
| | - Pimiao Huang
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China
| | - Ping Duan
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China
| | - Hongwei Wang
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China.
| | - Jianquan Kan
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agri-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China.
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18
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Zhao C, Zhang F, Chen S, Hu W, Dong L, Zhao Y, Han M, Li Z. Effects of drying methods on the quality of Hanyuan Zanthoxylum bungeanum based on physicochemical and functional metabolite analysis. Lebensm Wiss Technol 2023. [DOI: 10.1016/j.lwt.2023.114674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
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19
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Schmidpeter PAM, Petroff JT, Khajoueinejad L, Wague A, Frankfater C, Cheng WWL, Nimigean CM, Riegelhaupt PM. Membrane phospholipids control gating of the mechanosensitive potassium leak channel TREK1. Nat Commun 2023; 14:1077. [PMID: 36841877 PMCID: PMC9968290 DOI: 10.1038/s41467-023-36765-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 02/15/2023] [Indexed: 02/27/2023] Open
Abstract
Tandem pore domain (K2P) potassium channels modulate resting membrane potentials and shape cellular excitability. For the mechanosensitive subfamily of K2Ps, the composition of phospholipids within the bilayer strongly influences channel activity. To examine the molecular details of K2P lipid modulation, we solved cryo-EM structures of the TREK1 K2P channel bound to either the anionic lipid phosphatidic acid (PA) or the zwitterionic lipid phosphatidylethanolamine (PE). At the extracellular face of TREK1, a PA lipid inserts its hydrocarbon tail into a pocket behind the selectivity filter, causing a structural rearrangement that recapitulates mutations and pharmacology known to activate TREK1. At the cytoplasmic face, PA and PE lipids compete to modulate the conformation of the TREK1 TM4 gating helix. Our findings demonstrate two distinct pathways by which anionic lipids enhance TREK1 activity and provide a framework for a model that integrates lipid gating with the effects of other mechanosensitive K2P modulators.
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Affiliation(s)
| | - John T Petroff
- Department of Anesthesiology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - Leila Khajoueinejad
- Department of Anesthesiology, Weill Cornell Medical College, New York, NY, USA
| | - Aboubacar Wague
- Department of Anesthesiology, Weill Cornell Medical College, New York, NY, USA
| | - Cheryl Frankfater
- Department of Endocrinology, Metabolism, and Lipid Research, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - Wayland W L Cheng
- Department of Anesthesiology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - Crina M Nimigean
- Department of Anesthesiology, Weill Cornell Medical College, New York, NY, USA
- Department of Physiology and Biophysics, Weill Cornell Medical College, New York, NY, USA
- Department of Biochemistry, Weill Cornell Medical College, New York, NY, USA
| | - Paul M Riegelhaupt
- Department of Anesthesiology, Weill Cornell Medical College, New York, NY, USA.
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20
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Separation and Purification of Hydroxyl-α-Sanshool from Zanthoxylum armatum DC. by Silica Gel Column Chromatography. Int J Mol Sci 2023; 24:ijms24043156. [PMID: 36834566 PMCID: PMC9966115 DOI: 10.3390/ijms24043156] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/27/2023] [Accepted: 02/02/2023] [Indexed: 02/09/2023] Open
Abstract
Hydroxyl-α-sanshool is the main alkylamide produced by Zanthoxylum armatum DC., and it is responsible for numbness after consuming Z. armatum-flavored dishes or food products. The present study deals with the isolation, enrichment, and purification of hydroxyl-α-sanshool. The results indicated that the powder of Z. armatum was extracted with 70% ethanol and then filtrated; the supernatant was concentrated to get pasty residue. Petroleum ether (60-90 °C) and ethyl acetate at a 3:2 ratio, with an Rf value of 0.23, were chosen as the eluent. Petroleum ether extract (PEE) and ethyl acetate-petroleum ether extract (E-PEE) were used as the suitable enriched method. Afterward, the PEE and E-PEE were loaded onto silica gel for silica gel column chromatography. Preliminary identification was carried out by TLC and UV. The fractions containing mainly hydroxyl-α-sanshool were pooled and dried by rotary evaporation. Lastly, all of the samples were determined by HPLC. The yield and recovery rates of hydroxyl-α-sanshool in the p-E-PEE were 12.42% and 121.65%, respectively, and the purity was 98.34%. Additionally, compared with E-PEE, the purity of hydroxyl-α-sanshool in the purification of E-PEE (p-E-PEE) increased by 88.30%. In summary, this study provides a simple, rapid, economical, and effective approach to the separation of high-purity hydroxyl-α-sanshool.
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21
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Yin C, Zeng F, Huang P, Shi Z, Yang Q, Pei Z, Wang X, Chai L, Zhang S, Yang S, Dong W, Lu X, Wang Y. The Bi-Functional Paxilline Enriched in Skin Secretion of Tree Frogs ( Hyla japonica) Targets the KCNK18 and BK Ca Channels. Toxins (Basel) 2023; 15:70. [PMID: 36668889 PMCID: PMC9862588 DOI: 10.3390/toxins15010070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 01/15/2023] Open
Abstract
The skin secretion of tree frogs contains a vast array of bioactive chemicals for repelling predators, but their structural and functional diversity is not fully understood. Paxilline (PAX), a compound synthesized by Penicillium paxilli, has been known as a specific antagonist of large conductance Ca2+-activated K+ Channels (BKCa). Here, we report the presence of PAX in the secretions of tree frogs (Hyla japonica) and that this compound has a novel function of inhibiting the potassium channel subfamily K member 18 (KCNK18) channels of their predators. The PAX-induced KCNK18 inhibition is sufficient to evoke Ca2+ influx in charybdotoxin-insensitive DRG neurons of rats. By forming π-π stacking interactions, four phenylalanines located in the central pore of KCNK18 stabilize PAX to block the ion permeation. For PAX-mediated toxicity, our results from animal assays suggest that the inhibition of KCNK18 likely acts synergistically with that of BKCa to elicit tingling and buzzing sensations in predators or competitors. These results not only show the molecular mechanism of PAX-KCNK18 interaction, but also provide insights into the defensive effects of the enriched PAX.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | - Yunfei Wang
- College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, China
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22
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Deng X. A Mini Review on Natural Safeners: Chemistry, Uses, Modes of Action, and Limitations. PLANTS (BASEL, SWITZERLAND) 2022; 11:3509. [PMID: 36559620 PMCID: PMC9784830 DOI: 10.3390/plants11243509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/12/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Herbicide injury is a common problem during the application of herbicides in practice. However, applying herbicide safeners can avoid herbicide damage. Safeners selectively protect crops against herbicide injury without affecting the biological activity of herbicides against the target weeds. However, after long-term application, commercial safeners were found to pose risks to the agricultural ecological environment. Natural safeners are endogenous compounds from animals, plants, and microbes, with unique structures and are relatively environment-friendly, and thus can address the potential risks of commercial safeners. This paper summarizes the current progress of the discovery methods, structures, uses, and modes of action of natural safeners. This study also concludes the limitations of natural safeners and prospects the future research directions, offering guidance for the practical application of natural safeners to prevent herbicide injury. This study will also guide the research and development of corresponding products.
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Affiliation(s)
- Xile Deng
- Key Laboratory for Biology and Control of Weeds, Hunan Agricultural Biotechnology Research Institute, Hunan Academy of Agricultural Sciences, No. 2 Yuanda Road, Changsha 410125, China
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23
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Hu Y, Chen X, Hu M, Zhang D, Yuan S, Li P, Feng L. Medicinal and edible plants in the treatment of dyslipidemia: advances and prospects. Chin Med 2022; 17:113. [PMID: 36175900 PMCID: PMC9522446 DOI: 10.1186/s13020-022-00666-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 08/29/2022] [Indexed: 11/10/2022] Open
Abstract
Dyslipidemia is an independent risk factor of cardiovascular diseases (CVDs), which lead to the high mortality, disability, and medical expenses in the worldwide. Based on the previous researches, the improvement of dyslipidemia could efficiently prevent the occurrence and progress of cardiovascular diseases. Medicinal and edible plants (MEPs) are the characteristics of Chinese medicine, and could be employed for the disease treatment and health care mostly due to their homology of medicine and food. Compared to the lipid-lowering drugs with many adverse effects, such as rhabdomyolysis and impaired liver function, MEPs exhibit the great potential in the treatment of dyslipidemia with high efficiency, good tolerance and commercial value. In this review, we would like to introduce 20 kinds of MEPs with lipid-lowering effect in the following aspects, including the source, function, active component, target and underlying mechanism, which may provide inspiration for the development of new prescription, functional food and complementary therapy for dyslipidemia.
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Affiliation(s)
- Ying Hu
- China Academy of Chinese Medical Sciences Guang'anmen Hospital, Beijing, 100053, China
- China Academy of Chinese Medical Sciences, Beijing, 100700, China
- Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Xingjuan Chen
- China Academy of Chinese Medical Sciences Guang'anmen Hospital, Beijing, 100053, China
| | - Mu Hu
- China Academy of Chinese Medical Sciences Guang'anmen Hospital, Beijing, 100053, China
- China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Dongwei Zhang
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, China
| | - Shuo Yuan
- Henan Key Laboratory of Children's Genetics and Metabolic Diseases, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou, 450018, China.
| | - Ping Li
- Beijing University of Chinese Medicine, Beijing, 100029, China.
- Beijing University of Chinese Medicine Third Affiliated Hospital, Beijing, 100029, China.
| | - Ling Feng
- China Academy of Chinese Medical Sciences Guang'anmen Hospital, Beijing, 100053, China.
- China Academy of Chinese Medical Sciences, Beijing, 100700, China.
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24
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Zhang H, Guo Z, Wang X, Xian J, Zou L, Zheng C, Zhang J. Protective mechanisms of Zanthoxylum bungeanum essential oil on DSS-induced ulcerative colitis in mice based on a colonic mucosal transcriptomic approach. Food Funct 2022; 13:9324-9339. [PMID: 36069282 DOI: 10.1039/d1fo04323d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The ameliorative effects on ulcerative colitis (UC) as well as the related mechanisms of the essential oil derived from the edible herb Zanthoxylum bungeanum Maxim (ZBEO) have been demonstrated herein. Based on GC-MS analysis, 45 volatile compounds in ZBEO were determined for its quality control. In vitro studies showed that after pretreatment with ZBEO, the disordered expression levels of pro-inflammatory cytokines (TNF-α, IL-6, and IL-1β) and an anti-inflammatory cytokine (IL-10) on colon epithelial NCM460 cells induced by lipopolysaccharide (LPS) could be reversed. Additionally, oral administration of ZBEO significantly alleviated colitis in dextran sulfate sodium (DSS)-induced UC mice, including body weight loss, colon length shortening, disease activity index and colonic pathological damage. Furthermore, to uncover the anti-UC mechanisms of ZBEO, analysis of transcriptomes by next-generation sequencing technology was performed to explore the RNA genetic variation on colon tissues. Based on GO analysis and KEGG pathway analysis, a series of genetic pathways involved in the protective role of ZBEO against UC were determined. As a result, ZBEO treatment could decrease the expression of VCAM-1, TLR8, IL-1β and IL-11 mRNA as verified by qRT-PCR, which are involved in these potential genetic pathways. In conclusion, ZBEO administration would be a medicinal or dietary supplementation strategy for ulcerative colitis treatment.
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Affiliation(s)
- Huan Zhang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611130, China.
| | - Zhiqing Guo
- Oncology Teaching and Research Department, Hospital of Chengdu University of Traditional of Chinese Medicine, Chengdu 610072, China.
| | - Xiao Wang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611130, China.
| | - Jing Xian
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611130, China.
| | - Liang Zou
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Chengdu University, Chengdu, 610106, China
| | - Chuan Zheng
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611130, China. .,Oncology Teaching and Research Department, Hospital of Chengdu University of Traditional of Chinese Medicine, Chengdu 610072, China.
| | - Jinming Zhang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611130, China.
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25
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Tomita T, Kawano Y, Kassai M, Onda H, Nakajima Y, Miyazaki K. Hydroxy-β-sanshool isolated from Zanthoxylum piperitum (Japanese pepper) shortens the period of the circadian clock. Food Funct 2022; 13:9407-9418. [PMID: 35960176 DOI: 10.1039/d2fo01036d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We showed that an ethanol extract from Zanthoxylum piperitum can shorten the circadian rhythm at the cellular level and that this activity was due to hydroxy-β-sanshool, a secondary metabolite in this plant. An ethanol extract of Z. piperitum was repeatedly fractionated using solid phase extraction and reverse-phase HPLC, then the circadian rhythms of cells to which the fractions were loaded were monitored using real-time reporter gene assays. We purified one HPLC peak and identified it as hydroxy-β-sanshool using liquid chromatography (LC)-precision-mass spectrometry (MS). This compound shortened the period of Bmal1 and Per2 at the cellular level. Incubation cells for 24 h with hydroxy-β-sanshool resulted in upregulated Per2 promoter activity. Hydroxy-β-sanshool also dose-dependently upregulated expression of the clock genes Bmal1, Per1, Per2 and Cry1 and the clock-controlled oxidative stress responsive genes Gpx1and Sod2.
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Affiliation(s)
- Tatsunosuke Tomita
- Cellular and Molecular Biotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba 305-8566, Japan.
| | - Yasuhiro Kawano
- Cellular and Molecular Biotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba 305-8566, Japan.
| | - Masahiro Kassai
- S&B Foods Inc., #605 MITSUI LINK-Lab Shinkiba1 Shinkiba 2-3-8, Koto-ku, Tokyo 136-0082, Japan
| | - Hiroyuki Onda
- S&B Foods Inc., #605 MITSUI LINK-Lab Shinkiba1 Shinkiba 2-3-8, Koto-ku, Tokyo 136-0082, Japan
| | - Yoshihiro Nakajima
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Hayashicho 2217-14, Takamatsu, 761-0395, Japan
| | - Koyomi Miyazaki
- Cellular and Molecular Biotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba 305-8566, Japan.
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26
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Ivane NMA, Haruna SA, Zekrumah M, Roméo Elysé FK, Hassan MO, Hashim SB, Tahir HE, Zhang D. Composition, mechanisms of tingling paresthesia, and health benefits of Sichuan pepper: A review of recent progress. Trends Food Sci Technol 2022. [DOI: 10.1016/j.tifs.2022.05.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Dallazen JL, da Luz BB, Maria-Ferreira D, Nascimento AM, Cipriani TR, de Souza LM, Geppetti P, de Paula Werner MF. Local effects of natural alkylamides from Acmella oleracea and synthetic isobutylalkyl amide on neuropathic and postoperative pain models in mice. Fitoterapia 2022; 160:105224. [PMID: 35659524 DOI: 10.1016/j.fitote.2022.105224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 05/25/2022] [Accepted: 05/26/2022] [Indexed: 11/25/2022]
Abstract
Neuropathic and postoperative pain are clinical conditions that impair the patient's quality of life. The current pharmacotherapy of both painful states is ineffective and accompanied by several side effects. In order to develop new therapeutics targets, the secondary metabolites of plants have been extensively studied. Acmella oleracea ("jambu") is a native plant from the Amazon region and rich in alkylamides, bioactive compounds responsible for inducing anesthetic and chemesthetic sensations. We previously demonstrated that the intraplantar administration of an hexanic fraction (HF) rich in alkylamides from jambu and the synthetic isobutylalkyl amide (IBA) at 0.1 μg/20 μL can promote antinociceptive and anti-inflammatory effects. Thus, this study aimed to evaluate the local effect of HF and IBA (0.1 μg/20 μL) on neuropathic (partial sciatic nerve ligation, PSNL) and postoperative pain (plantar incision surgery, PIS) models in mice. Seven days after the PSNL, the mechanical (von Frey test) and cold (acetone-evoked evaporative cooling) allodynia, and digital gait parameters were analyzed. The intraplantar HF and IBA treatments attenuated the mechanical and cold allodynia as well as the static (max. Contact and print area) and dynamic (stand duration) parameters of digital gait analyses. On the day after PIS, the mechanical allodynia, heat hyperalgesia (hot plate, 52 ± 0.1°C), and spontaneous nociception scores were evaluated. Topical treatment with HF reduced the mechanical allodynia, heat hyperalgesia, and spontaneous nociception scores. In contrast, IBA treatment only partially reduced the mechanical allodynia. In summary, the local treatment with HF was effective on both neuropathic and postoperative pain, as opposed to IBA, which only had an effect on neuropathic pain.
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Affiliation(s)
| | | | - Daniele Maria-Ferreira
- Department of Pharmacology, Federal University of Parana, Curitiba, Brazil; Instituto de Pesquisa Pelé Pequeno Príncipe, Faculdades Pequeno Príncipe, Curitiba, Brazil
| | - Adamara Machado Nascimento
- Department of Biochemistry and Molecular Biology, Federal University of Parana, Curitiba, Brazil; Multidisciplinary Center, Federal University of Acre, Cruzeiro do Sul, Brazil
| | - Thales Ricardo Cipriani
- Department of Biochemistry and Molecular Biology, Federal University of Parana, Curitiba, Brazil
| | - Lauro Mera de Souza
- Instituto de Pesquisa Pelé Pequeno Príncipe, Faculdades Pequeno Príncipe, Curitiba, Brazil
| | - Pierangelo Geppetti
- Department of Health Sciences, Section of Clinical Pharmacology and Oncology, University of Florence, Florence, Italy
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28
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Tan F, Xu L, Liu Y, Li H, Zhang D, Qin C, Han Y, Han J. Design of hydroxy-α-sanshool loaded nanostructured lipid carriers as a potential local anesthetic. Drug Deliv 2022; 29:743-753. [PMID: 35244508 PMCID: PMC8903781 DOI: 10.1080/10717544.2022.2039808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Hydroxy-α-sanshool (HAS), extracted from Zanthoxylum piperitum, is commonly used in oral surgery to relief pain. However, the application of HAS is limited in clinical practice due to its poor stability. This study focuses on the design of a novel nano-formulation delivery system for HAS to improve its stability and local anesthetic effect. Hydroxy-α-sanshool loaded nanostructured lipid carriers (HAS-NLCs) were prepared by melting emulsification and ultra-sonication using monostearate (GMS) and oleic acid (OA) as lipid carriers, and poloxamer-188 (F68) as a stabilizer. Besides, the formulation was optimized by response surface methodology (RSM). Then, the best formulation was characterized for particle size, polydispersity index (PDI), zeta potential, entrapment efficiency (EE%), drug loading (DL%), differential scanning calorimetry (DSC), and morphology (transmission electron microscopy, TEM). The obtained HAS-NLCs were homogeneous, near spherical particles with high DL% capacity. The stability of HAS-NLCs against oxygen, light, and heat was greatly improved over 10.79 times, 3.25 times, and 2.09 times, respectively, compared to free HAS. In addition, HAS-NLCs could exhibit sustained release in 24 h following a double-phase kinetics model in vitro release study. Finally, HAS-NLCs had excellent anesthetic effect at low dose in formalin test compared with free HAS and lidocaine, which indicated HAS-NLCs were a potential local anesthesia formulation in practice.
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Affiliation(s)
- Fengming Tan
- Department of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, China
| | - Lulu Xu
- Department of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, China
| | - Yanling Liu
- Department of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, China
| | - Huan Li
- Department of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, China
| | - Dahan Zhang
- Department of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, China
| | - Cuiying Qin
- Department Center for Medical Science and Technology, Nation Health Commission of the People's Republic of China, Beijing, China
| | - Yang Han
- School of Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Jing Han
- Faculty of Functional Food and Wine, Shenyang Pharmaceutical University, Shenyang, China
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29
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Toy PH, Loo YH, Leakasindhu S, Kan CM. Synthesis of Bungeanool, Isobungeanool, Dihydrobungeanool, Tetrahydrobungeanool, Hazaleamide, Lanyuamide III, and Analogues. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1653-4050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractThe bungeanools are a family of alkamide natural products isolated from the pericarps of Zanthoxylum bungeanum (Sichuan pepper), and they are structurally related to the sanshools. While the sanshools, especially hydroxy-α-sanshool, have been studied in a variety of contexts, research regarding the bungeanools has been much more limited. To facilitate their study, we have developed stereoselective syntheses of all four members of this family of compounds by using flexible routes that are also amenable to the synthesis of analogues. The key transformation in the syntheses was the stereoselective triphenylphosphine/phenol-catalyzed isomerization of an alkynoate to the corresponding conjugated E,E-dienoate.
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30
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Cross-modal effect of capsaicin and pepper oleoresin on the enhancement of saltiness perception in a NaCl model solution. Food Qual Prefer 2022. [DOI: 10.1016/j.foodqual.2022.104542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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31
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Skaar DA, Dietze EC, Alva-Ornelas JA, Ann D, Schones DE, Hyslop T, Sistrunk C, Zalles C, Ambrose A, Kennedy K, Idassi O, Miranda Carboni G, Gould MN, Jirtle RL, Seewaldt VL. Epigenetic Dysregulation of KCNK9 Imprinting and Triple-Negative Breast Cancer. Cancers (Basel) 2021; 13:6031. [PMID: 34885139 PMCID: PMC8656495 DOI: 10.3390/cancers13236031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 11/26/2021] [Indexed: 12/02/2022] Open
Abstract
Genomic imprinting is an inherited form of parent-of-origin specific epigenetic gene regulation that is dysregulated by poor prenatal nutrition and environmental toxins. KCNK9 encodes for TASK3, a pH-regulated potassium channel membrane protein that is overexpressed in 40% of breast cancer. However, KCNK9 gene amplification accounts for increased expression in <10% of these breast cancers. Here, we showed that KCNK9 is imprinted in breast tissue and identified a differentially methylated region (DMR) controlling its imprint status. Hypomethylation at the DMR, coupled with biallelic expression of KCNK9, occurred in 63% of triple-negative breast cancers (TNBC). The association between hypomethylation and TNBC status was highly significant in African-Americans (p = 0.006), but not in Caucasians (p = 0.70). KCNK9 hypomethylation was also found in non-cancerous tissue from 77% of women at high-risk of developing breast cancer. Functional studies demonstrated that the KCNK9 gene product, TASK3, regulates mitochondrial membrane potential and apoptosis-sensitivity. In TNBC cells and non-cancerous mammary epithelial cells from high-risk women, hypomethylation of the KCNK9 DMR predicts for increased TASK3 expression and mitochondrial membrane potential (p < 0.001). This is the first identification of the KCNK9 DMR in mammary epithelial cells and demonstration that its hypomethylation in breast cancer is associated with increases in both mitochondrial membrane potential and apoptosis resistance. The high frequency of hypomethylation of the KCNK9 DMR in TNBC and non-cancerous breast tissue from high-risk women provides evidence that hypomethylation of the KNCK9 DMR/TASK3 overexpression may serve as a marker of risk and a target for prevention of TNBC, particularly in African American women.
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Affiliation(s)
- David A. Skaar
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695, USA;
| | - Eric C. Dietze
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - Jackelyn A. Alva-Ornelas
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - David Ann
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - Dustin E. Schones
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - Terry Hyslop
- Department of Biostatistics, School of Medicine, Duke University, Durham, NC 27710, USA;
| | - Christopher Sistrunk
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - Carola Zalles
- Department of Pathology, Mercy Hospital, Miami, FL 33133, USA;
| | - Adrian Ambrose
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - Kendall Kennedy
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - Ombeni Idassi
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
| | - Gustavo Miranda Carboni
- Laboratory of Oncology, Department of Oncology, School of Medicine, University of Tennessee Health Science, Memphis, TN 38163, USA;
| | - Michael N. Gould
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, WI 53706, USA;
| | - Randy L. Jirtle
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695, USA;
| | - Victoria L. Seewaldt
- Beckman Research Institute, Department of Population Sciences, City of Hope, Duarte, CA 91010, USA; (E.C.D.); (J.A.A.-O.); (D.A.); (D.E.S.); (C.S.); (A.A.); (K.K.); (O.I.)
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32
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Feng X, Wang H, Wang Z, Huang P, Kan J. Discrimination and characterization of the volatile organic compounds in eight kinds of huajiao with geographical indication of China using electronic nose, HS-GC-IMS and HS-SPME-GC-MS. Food Chem 2021; 375:131671. [PMID: 34865919 DOI: 10.1016/j.foodchem.2021.131671] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 11/01/2021] [Accepted: 11/21/2021] [Indexed: 12/18/2022]
Abstract
Huajiao (Zanthoxylum bungeanum maxim. and Zanthoxylum armatum DC.) is a highly prized spice in China due to its distinctive aroma and taste. The volatile organic compounds (VOCs) of eight kinds of red and green huajiao which varied according to geographical indication of P.R. China were evaluated by electronic nose (E-nose), headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) and headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS). Results showed that red huajiao emitted more terpenes, esters, and fewer alcohols than green huajiao. Partial least squares-discriminant analysis based on GC-MS and GC-IMS data was revealed a good classifying tool for huajiao from different original habitats. Four and eight aroma substances were selected as the potential markers by the variable importance in projection (VIP) variable selection method, respectively. The results of the current study provide a useful basis in the huajiao aroma difference study. Additionally, a rapid huajiao aroma analysis method using GC-IMS was developed.
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Affiliation(s)
- Xiya Feng
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China
| | - Hongwei Wang
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China
| | - Zhirong Wang
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China
| | - Pimiao Huang
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China
| | - Jianquan Kan
- College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China; Laboratory of Quality & Safety Risk Assessment for Agro-products on Storage and Preservation (Chongqing), Ministry of Agriculture and Rural Affairs of the People's Republic of China, Chongqing 400715, PR China; Chinese-Hungarian Cooperative Research Centre for Food Science, Chongqing 400715, PR China.
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33
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Luo J, Ke J, Hou X, Li S, Luo Q, Wu H, Shen G, Zhang Z. Composition, structure and flavor mechanism of numbing substances in Chinese prickly ash in the genus Zanthoxylum: A review. Food Chem 2021; 373:131454. [PMID: 34731789 DOI: 10.1016/j.foodchem.2021.131454] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 08/17/2021] [Accepted: 10/20/2021] [Indexed: 12/20/2022]
Abstract
Chinese prickly ash is known for producing a typical pungent sensation in Sichuan Cuisine. Accumulating evidence suggest a series of health benefits and pharmacological effects associated with prickly ash. Therefore, a systematic analysis of the composition, structural properties, detection, and flavor mechanism of numbing substances is highly necessitated to address their future application. Sanshool-based unsaturated amides are the primary cause of tingling. The numbing substances have poor stability and are prone to oxidation and decomposition reactions due to their highly unsaturated conjugated diene structures. Pungent sensations evoked by different sanshools are distinct, which is attributed to different mechanisms of interaction with membrane ion channels (TRPV1, TRPA1, and KCNK). In this paper, the composition, structural properties (such as isomerization, oxidation), detection, and flavor mechanism of numbing substances of prickly ash were summarized. The prospective application and future research direction of numbing substances in the prickly ash industry were also proposed.
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Affiliation(s)
- Jingjing Luo
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Jingxuan Ke
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Xiaoyan Hou
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Shanshan Li
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Qingying Luo
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Hejun Wu
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Guanghui Shen
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China
| | - Zhiqing Zhang
- College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
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34
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Cao XX, Zhao L, Shi BL, Wang HY, Zhang QB, Zhong K, Sun P, Zhu BQ, Zhang LL. The influence of NaCl on the dynamic perception of the pungency sensation elicited by Sichuan pepper oleoresins. Food Res Int 2021; 149:110660. [PMID: 34600662 DOI: 10.1016/j.foodres.2021.110660] [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: 05/01/2021] [Revised: 08/06/2021] [Accepted: 08/18/2021] [Indexed: 10/20/2022]
Abstract
A cross-modal interaction may exist between the perception of saltiness and the pungency elicited by Sichuan pepper oleoresin (Spo). Thirty-one hypersensitive panelists were selected to participate in this study. Spo solutions dissolved in different NaCl concentrations, ranging from 1.25 g/L to 167.9 g/L, were used as the test samples. The rated difference from control, the generalized labeled magnitude scale (gLMS), and the time-intensity (TI) method were used to determine the detection threshold (DT), the recognition threshold (RT), the intensity, and the dynamic perception of pungent sensation. The results revealed that the pungency thresholds increased significantly (p < 0.01) in the solution with a high NaCl (167.9 g/L) concentration. Furthermore, high NaCl solutions suppressed the pungency intensity at all Spo concentrations except for 0.02 g Spo/L in water (p < 0.05). The TI and principal component analysis (PCA) results showed that an increase in the Spo concentration prolonged the duration of the pungency sensation. However, the maximum intensity, the time to reach maximum intensity, the decay time of perception, and the end time of perception of the Spo solutions ranging from 2.13 g/L to 4.69 g/L were significantly reduced at medium (42.95 g/L) and high NaCl concentrations. Since the salty and pungency sensations exhibited by NaCl and Spo are common flavor combinations in food products and dishes, studying the influence of saltiness on the dynamic perception of pungent sensation not only aids the development of oral cleaners during pungency evaluation but also presents significant theoretical and practical value in creating pungent food and cuisine based on consumer preferences.
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Affiliation(s)
- Xiao-Xiao Cao
- College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
| | - Lei Zhao
- Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, China.
| | - Bo-Lin Shi
- Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, China.
| | - Hou-Yin Wang
- Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, China.
| | - Qing-Bin Zhang
- Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, China.
| | - Kui Zhong
- Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, China.
| | - Pei Sun
- Department of Psychology, School of Social Sciences, Tsinghua University, Beijing 100084, China.
| | - Bao-Qing Zhu
- College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Lu-Lu Zhang
- College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China; Department of Psychology, School of Social Sciences, Tsinghua University, Beijing 100084, China; Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, China.
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35
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Mathie A, Veale EL, Golluscio A, Holden RG, Walsh Y. Pharmacological Approaches to Studying Potassium Channels. Handb Exp Pharmacol 2021; 267:83-111. [PMID: 34195873 DOI: 10.1007/164_2021_502] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this review, we consider the pharmacology of potassium channels from the perspective of these channels as therapeutic targets. Firstly, we describe the three main families of potassium channels in humans and disease states where they are implicated. Secondly, we describe the existing therapeutic agents which act on potassium channels and outline why these channels represent an under-exploited therapeutic target with potential for future drug development. Thirdly, we consider the evidence desired in order to embark on a drug discovery programme targeting a particular potassium channel. We have chosen two "case studies": activators of the two-pore domain potassium (K2P) channel TREK-2 (K2P10.1), for the treatment of pain and inhibitors of the voltage-gated potassium channel KV1.3, for use in autoimmune diseases such as multiple sclerosis. We describe the evidence base to suggest why these are viable therapeutic targets. Finally, we detail the main technical approaches available to characterise the pharmacology of potassium channels and identify novel regulatory compounds. We draw particular attention to the Comprehensive in vitro Proarrhythmia Assay initiative (CiPA, https://cipaproject.org ) project for cardiac safety, as an example of what might be both desirable and possible in the future, for ion channel regulator discovery projects.
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Affiliation(s)
- Alistair Mathie
- Medway School of Pharmacy, University of Kent, Kent, UK. .,Medway School of Pharmacy, University of Greenwich, London, UK. .,School of Engineering, Arts, Science and Technology, University of Suffolk, Ipswich, UK.
| | - Emma L Veale
- Medway School of Pharmacy, University of Kent, Kent, UK.,Medway School of Pharmacy, University of Greenwich, London, UK
| | - Alessia Golluscio
- Medway School of Pharmacy, University of Kent, Kent, UK.,Medway School of Pharmacy, University of Greenwich, London, UK
| | - Robyn G Holden
- Medway School of Pharmacy, University of Kent, Kent, UK.,Medway School of Pharmacy, University of Greenwich, London, UK
| | - Yvonne Walsh
- Medway School of Pharmacy, University of Kent, Kent, UK.,Medway School of Pharmacy, University of Greenwich, London, UK
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36
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Wang M, Tong S, Ma T, Xi Z, Liu J. Chromosome-level genome assembly of Sichuan pepper provides insights into apomixis, drought tolerance, and alkaloid biosynthesis. Mol Ecol Resour 2021; 21:2533-2545. [PMID: 34145765 DOI: 10.1111/1755-0998.13449] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 06/11/2021] [Accepted: 06/14/2021] [Indexed: 11/27/2022]
Abstract
Sichuan pepper is a commonly used spice in Asian cuisine. Sanshools and wgx-50/gx-50 isolated from it have been shown to possess a wide spectrum of medicinal properties. Here we generated a chromosome-level genome assembly of one Sichuan pepper species Zanthoxylum armatum characterized by drought tolerance and apomixis. Analyses of functionally related genes suggested that increased gene copy number and expression level of drought-tolerant genes might play an important role in improving drought tolerance of Z. armatum. Moreover, a gene encoding an RWP-RK domain-containing protein was shown to contribute to apomixis in Z. armatum, which was further characterized by overexpression in Arabidopsis thaliana. Furthermore, based on gene homology searching and co-expression patterns of metabolite concentration and gene expressions, we identified a number of candidate genes involved in the biosynthesis of sanshools and wgx-50/gx-50. Taken together, our results yield valuable insights for understanding the evolution of apomixis, drought tolerance, and alkaloid biosynthesis in Z. armatum.
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Affiliation(s)
- Mingcheng Wang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China.,Institute for Advanced Study, Chengdu University, Chengdu, China
| | - Shaofei Tong
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Tao Ma
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Zhenxiang Xi
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
| | - Jianquan Liu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
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Pavinato L, Nematian-Ardestani E, Zonta A, De Rubeis S, Buxbaum J, Mancini C, Bruselles A, Tartaglia M, Pessia M, Tucker SJ, D’Adamo MC, Brusco A. KCNK18 Biallelic Variants Associated with Intellectual Disability and Neurodevelopmental Disorders Alter TRESK Channel Activity. Int J Mol Sci 2021; 22:ijms22116064. [PMID: 34199759 PMCID: PMC8200030 DOI: 10.3390/ijms22116064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/30/2021] [Accepted: 06/01/2021] [Indexed: 12/19/2022] Open
Abstract
The TWIK-related spinal cord potassium channel (TRESK) is encoded by KCNK18, and variants in this gene have previously been associated with susceptibility to familial migraine with aura (MIM #613656). A single amino acid substitution in the same protein, p.Trp101Arg, has also been associated with intellectual disability (ID), opening the possibility that variants in this gene might be involved in different disorders. Here, we report the identification of KCNK18 biallelic missense variants (p.Tyr163Asp and p.Ser252Leu) in a family characterized by three siblings affected by mild-to-moderate ID, autism spectrum disorder (ASD) and other neurodevelopment-related features. Functional characterization of the variants alone or in combination showed impaired channel activity. Interestingly, Ser252 is an important regulatory site of TRESK, suggesting that alteration of this residue could lead to additive downstream effects. The functional relevance of these mutations and the observed co-segregation in all the affected members of the family expand the clinical variability associated with altered TRESK function and provide further insight into the relationship between altered function of this ion channel and human disease.
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Affiliation(s)
- Lisa Pavinato
- Department of Medical Sciences, University of Turin, 10126 Turin, Italy;
- Center for Molecular Medicine Cologne, Institute of Human Genetics, University of Cologne, 50931 Cologne, Germany
| | - Ehsan Nematian-Ardestani
- Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, MSD-2080 Msida, Malta; (E.N.-A.); (M.P.)
| | - Andrea Zonta
- Unit of Medical Genetics, “Città della Salute e della Scienza” University Hospital, 10126 Turin, Italy;
| | - Silvia De Rubeis
- Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (S.D.R.); (J.B.)
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Joseph Buxbaum
- Seaver Autism Center for Research and Treatment, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (S.D.R.); (J.B.)
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Cecilia Mancini
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, IRCCS, 00165 Rome, Italy; (C.M.); (M.T.)
| | - Alessandro Bruselles
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy;
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, IRCCS, 00165 Rome, Italy; (C.M.); (M.T.)
| | - Mauro Pessia
- Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, MSD-2080 Msida, Malta; (E.N.-A.); (M.P.)
- Department of Physiology, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain P.O. Box 17666, United Arab Emirates
| | - Stephen J. Tucker
- Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 4BH, UK;
| | - Maria Cristina D’Adamo
- Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, MSD-2080 Msida, Malta; (E.N.-A.); (M.P.)
- Correspondence: (M.C.D.); (A.B.)
| | - Alfredo Brusco
- Department of Medical Sciences, University of Turin, 10126 Turin, Italy;
- Unit of Medical Genetics, “Città della Salute e della Scienza” University Hospital, 10126 Turin, Italy;
- Correspondence: (M.C.D.); (A.B.)
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Chen K, Xue L, Li Q, Li Y, Mao Y, Fan S, Zhang L, Zhao L. Quantitative structure-pungency landscape of sanshool dietary components from Zanthoxylum species. Food Chem 2021; 363:130286. [PMID: 34120040 DOI: 10.1016/j.foodchem.2021.130286] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 05/25/2021] [Accepted: 06/01/2021] [Indexed: 10/21/2022]
Abstract
The molecular basis of the pungency of sanshool dietary components from the Zanthoxylum species has been firstly addressed by constructing the statistically significant and highly predictive quantitative structure-pungency relationship models along with the pharmacophore models. The important pungent structural characters in the isobutylamide moiety and linear carbon chains were elucidated in this study that maintained the suitable spatial packing and electrostatic interactions with their receptors. Our results also revealed that the amide moiety, N-isobutyl moiety with suitable bulky and restricted electronegative substituents, and the relatively long straight carbon chains with suitable (conjugated) CC bonds or heteroatoms at regular intervals were essential for the high pungency. The pungency of 42 new sanshools was predicted, compared with the rough experimental data, and ultimately classified into weak, medium and strong types. Most of these sanshools were found to have good oral bioavailability and acceptable pharmacokinetic properties.
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Affiliation(s)
- Kexian Chen
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China.
| | - Lingling Xue
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China
| | - Qingyao Li
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China
| | - Yunyou Li
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China
| | - Yufen Mao
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China
| | - Shuwen Fan
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China
| | - Lulu Zhang
- Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, PR China
| | - Lei Zhao
- Food and Agriculture Standardization Institute, China National Institute of Standardization, Beijing 102200, PR China
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Zhu Z, Mei J, Sun S, Lu S, Li M, Guan Y, Chen Y, Xu Y, Zhang T, Shi F, Li X, Miao M, Zhao S, Gao Q, Mi Q, Tang P, Yao J. Nutrigenomics reveals potential genetic underpinning of diverse taste preference of Chinese men. Genes Genomics 2021; 43:689-699. [PMID: 33843022 DOI: 10.1007/s13258-021-01079-y] [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: 10/27/2020] [Accepted: 03/06/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND Taste preference varies geographically in China. However, studies on Chinese people's taste preference in different regions of China are limited, and are lack of research on the mechanism of differences in taste preference, especially in genetics. OBJECTIVE This study aims to investigate the characteristics of taste preference of Chinese men, and estimate whether diverse taste preference in Chinese have genetic underpinning. METHODS We conducted a questionnaire survey on taste preferences on 1076 males from 10 regions of China, and collected another 1427 males from the same regions which genotyped by microarray. We compared the correlation between different taste preference, and evaluated the correlation between the mutation frequency of inhouse database and different taste preference. The putative taste-preference-related genes were further utilized to estimate the candidate relationship on gene and gene network in different taste preference. RESULTS There was a correlation between different taste preferences in Chinese men. We found 31 SNPs associated with 6 kind of taste preferences. These SNPs located within or nearby 36 genes, and the tastes associated with 4 of these genes (TRPV1, AGT, ASIC2 and GLP1R) are consistent with the previous studies. Moreover, in different tastes which were suggested to be associated with each other, some putative related genes were the same or in the same gene network, such as pathways related with blood pressure, response to stimulus and nervous system. CONCLUSIONS This study indicates that the diverse taste preference of Chinese men may have genetic underpinning.
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Affiliation(s)
- Zhouhai Zhu
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Junpu Mei
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Silong Sun
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Sheming Lu
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Meng Li
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Ying Guan
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Ying Chen
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Yuqiong Xu
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Tao Zhang
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Fengxue Shi
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Xuemei Li
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Mingming Miao
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Shancen Zhao
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Qian Gao
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Qili Mi
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Ping Tang
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China
| | - Jianhua Yao
- Department of Tobacco and Health, Joint Institute of Tobacco and Health, 41 Keyi Road, Wuhua District, Kunming, 650106, Yunnan, China.
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40
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Cheon E, Mattes RD. Perceptual Quality of Nonesterified Fatty Acids Varies with Fatty Acid Chain Length. Chem Senses 2021; 46:6261959. [PMID: 34192309 DOI: 10.1093/chemse/bjab023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Nonesterified fatty acids (NEFA) are effective taste stimuli. The quality they impart has not been well characterized. Sourness, and "fattiness" have been reported, but an irritation component has also been described and how these transition with gradations of aliphatic chain length has not been systematically studied. This study examined intensity and quality ratings of NEFA ranging from C2 to C18. Oral sites and the time course of sensations were also monitored. Given all NEFA contain carboxylic acid moieties capable of donating hydrogen ions, the primary stimulus for sour taste, testing was conducted with and without sour adaptation to explore the contribution of sour taste across the range of NEFA. Short-chain NEFA (C2-C6) were rated as predominantly sour, and this was diminished in C2 and C4 by sour adaptation. Medium-chain NEFA (C8-C12) were rated as mainly irritating with long-chain NEFA (C18) described mostly as bitter. The latter may reflect the lack of "fatty" lexicon to describe the sensation. Short-chain NEFA were mostly localized to the anterior tongue and were of rapid onset. The sensation from medium-chain NEFA was attributed to the lateral tongue, whereas medium- and long-chain NEFA sensations were predominantly localized to the back of the tongue and throat and had a longer lag time. The findings indicate there is a systematic transition of NEFA taste quality and irritation with increments in chain length and this is consistent with multiple modes of transduction.
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Affiliation(s)
- Eunjin Cheon
- Department of Nutrition Science, Purdue University, 812 W State Street, West Lafayette, IN 47907-2059, USA
| | - Richard D Mattes
- Department of Nutrition Science, Purdue University, 812 W State Street, West Lafayette, IN 47907-2059, USA
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41
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Abstract
Of all the oral sensations that are experienced, "metallic" is one that is rarely reported in healthy participants. So why, then, do chemotherapy patients so frequently report that "metallic" sensations overpower and interfere with their enjoyment of food and drink? This side-effect of chemotherapy-often referred to (e.g., by patients) as "metal mouth"-can adversely affect their appetite, resulting in weight loss, which potentially endangers (or at the very least slows) their recovery. The etiology of "metal mouth" is poorly understood, and current management strategies are largely unevidenced. As a result, patients continue to suffer as a result of this poorly understood phenomenon. Here, we provide our perspective on the issue, outlining the evidence for a range of possible etiologies, and highlighting key research questions. We explore the evidence for "metallic" as a putative taste, and whether "metal mouth" might therefore be a form of phantageusia, perhaps similar to already-described "release-of-inhibition" phenomena. We comment on the possibility that "metal mouth" may simply be a direct effect of chemotherapy drugs. We present the novel theory that "metal mouth" may be linked to chemotherapy-induced sensitization of TRPV1. Finally, we discuss the evidence for retronasal olfaction of lipid oxidation products in the etiology of "metal mouth." This article seeks principally to guide much-needed future research which will hopefully one day provide a basis for the development of novel supportive therapies for future generations of patients undergoing chemotherapy.
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Affiliation(s)
- Alastair J M Reith
- Oxford Medical School, Medical Sciences Division, John Radcliffe Hospital, UK
| | - Charles Spence
- Crossmodal Research Laboratory, Department of Experimental Psychology, Oxford University, UK
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42
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Mechanistic elucidation of the oral pungency of capsaicin-related dietary components: Spatial structural insights. Food Chem 2021; 353:129429. [PMID: 33714121 DOI: 10.1016/j.foodchem.2021.129429] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 02/11/2021] [Accepted: 02/19/2021] [Indexed: 12/17/2022]
Abstract
The mechanistic insights into the oral pungency of capsaicin-related dietary components have been elucidated from the spatial structural perspectives by establishing statistically significant and highly predictive three-dimensional quantitative structure-property relationship models. Our results visualized the possible favorable and unfavorable steric and electrostatic interactions with the pungent receptors with the assistance of pharmacophore models, and revealed the suitable electronegative/positive or bulky substitutions in the vanillyl group, amide moiety, linear alkyl chain and their adjacent structural area of capsaicin required for the desired pungency, which was not only complementary to the viewpoints proposed in our previous structure-pungency correlations, but also was applied to clearly clarify the pungent differences in compounds, and well predict the pungency of 21 capsaicin analogs though with ambiguous experimental data on pungency. Hopefully, this work would benefit the overall understanding of the pungent mechanism and facile discovery/design of analogs with desired pungency to expand their applications in foods.
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43
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Zhang D, Sun X, Battino M, Wei X, Shi J, Zhao L, Liu S, Xiao J, Shi B, Zou X. A comparative overview on chili pepper (capsicum genus) and sichuan pepper (zanthoxylum genus): From pungent spices to pharma-foods. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2021.03.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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44
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45
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Cataldo A, Hagura N, Hyder Y, Haggard P. Touch inhibits touch: sanshool-induced paradoxical tingling reveals perceptual interaction between somatosensory submodalities. Proc Biol Sci 2021; 288:20202914. [PMID: 33499781 PMCID: PMC7893281 DOI: 10.1098/rspb.2020.2914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Human perception of touch is mediated by inputs from multiple channels. Classical theories postulate independent contributions of each channel to each tactile feature, with little or no interaction between channels. In contrast to this view, we show that inputs from two sub-modalities of mechanical input channels interact to determine tactile perception. The flutter-range vibration channel was activated anomalously using hydroxy-α-sanshool, a bioactive compound of Szechuan pepper, which chemically induces vibration-like tingling sensations. We tested whether this tingling sensation on the lips was modulated by sustained mechanical pressure. Across four experiments, we show that sustained touch inhibits sanshool tingling sensations in a location-specific, pressure-level and time-dependent manner. Additional experiments ruled out the mediation of this interaction by nociceptive or affective (C-tactile) channels. These results reveal novel inhibitory influence from steady pressure onto flutter-range tactile perceptual channels, consistent with early-stage interactions between mechanoreceptor inputs within the somatosensory pathway.
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Affiliation(s)
- Antonio Cataldo
- Institute of Cognitive Neuroscience, University College London, Alexandra House 17 Queen Square, London WC1N 3AZ, UK.,Institute of Philosophy, School of Advanced Study - University of London, Senate House, Malet Street, London WC1E 7HU, UK.,Cognition, Values and Behaviour, Ludwig Maximilian University, Gabelsbergerstraße 62, 80333 München, Germany
| | - Nobuhiro Hagura
- Center for Information and Neural Networks, National Institute of Information and Communications Technology, 1-4 Yamadaoka, Suita City, Osaka 565-0871, Japan.,Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Yousef Hyder
- Institute of Cognitive Neuroscience, University College London, Alexandra House 17 Queen Square, London WC1N 3AZ, UK.,Center for Information and Neural Networks, National Institute of Information and Communications Technology, 1-4 Yamadaoka, Suita City, Osaka 565-0871, Japan
| | - Patrick Haggard
- Institute of Cognitive Neuroscience, University College London, Alexandra House 17 Queen Square, London WC1N 3AZ, UK.,Institute of Philosophy, School of Advanced Study - University of London, Senate House, Malet Street, London WC1E 7HU, UK
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46
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Zhou J, Xiao Y, Chen T, Gao J, Huang W, Li Z. Synthesis of hydroxy-α-sanshool. JOURNAL OF CHEMICAL RESEARCH 2020. [DOI: 10.1177/1747519820974323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Hydroxy-α-sanshool was synthesized in a 13% overall yield through eight steps, which included two Wittig reactions that were used to form the carbon skeleton with ethyl 2-oxoacetate and 2 E,4 E-hexadienal being reacted with the appropriate ylides. Impurities in the processes could easily be separated. Ethyl 6-hydroxy-2Z-hexenoate was converted to its E-isomer with catalysis by I2 and 2E,6Z,8E,10E-dodecatetraenoic acid was crystallized from a solution in 1% ethyl acetate in n-hexane.
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Affiliation(s)
- Jianjun Zhou
- School of Chemical Engineering, Sichuan University, Chengdu, P.R. China
| | - Yan Xiao
- School of Chemical Engineering, Sichuan University, Chengdu, P.R. China
| | - Taiping Chen
- School of Chemical Engineering, Sichuan University, Chengdu, P.R. China
| | - Jiyu Gao
- School of Chemical Engineering, Sichuan University, Chengdu, P.R. China
| | - Wencai Huang
- School of Chemical Engineering, Sichuan University, Chengdu, P.R. China
| | - Zicheng Li
- School of Chemical Engineering, Sichuan University, Chengdu, P.R. China
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47
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Abstract
Mouthfeel refers to the physical or textural sensations in the mouth caused by foods and beverages that are essential to the acceptability of many edible products. The sensory subqualities contributing to mouthfeel are often chemogenic in nature and include heat, burning, cooling, tingling, and numbing. These "chemesthetic" sensations are a result of the chemical activation of receptors that are associated with nerve fibers mediating pain and mechanotransduction. Each of these chemesthetic sensations in the oral cavity are transduced in the nervous system by a combination of different molecular channels/receptors expressed on trigeminal nerve fibers that innervate the mouth and tongue. The molecular profile of these channels and receptors involved in mouthfeel include many transient receptor potential channels, proton-sensitive ion channels, and potassium channels to name a few. During the last several years, studies using molecular and physiological approaches have significantly expanded and enhanced our understanding of the neurobiological basis for these chemesthetic sensations. The purpose of the current review is to integrate older and newer studies to present a comprehensive picture of the channels and receptors involved in mouthfeel. We highlight that there still continue to be important gaps in our overall knowledge on flavor integration and perception involving chemesthetic sensations, and these gaps will continue to drive future research direction and future investigation.
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Affiliation(s)
- Christopher T Simons
- Department of Food Science and Technology, The Ohio State University, Columbus, OH, USA
| | - Amanda H Klein
- Department of Pharmacy Practice and Pharmaceutical Sciences, University of Minnesota, Duluth, MN, USA
| | - Earl Carstens
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, Davis, CA, USA
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48
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The Background K + Channel TRESK in Sensory Physiology and Pain. Int J Mol Sci 2020; 21:ijms21155206. [PMID: 32717813 PMCID: PMC7432782 DOI: 10.3390/ijms21155206] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 07/20/2020] [Accepted: 07/21/2020] [Indexed: 12/18/2022] Open
Abstract
TRESK belongs to the K2P family of potassium channels, also known as background or leak potassium channels due to their biophysical properties and their role regulating membrane potential of cells. Several studies to date have highlighted the role of TRESK in regulating the excitability of specific subtypes of sensory neurons. These findings suggest TRESK could be involved in pain sensitivity. Here, we review the different evidence available that involves the channel in pain and sensory perception, from studies knocking out the channel or overexpressing it to identified mutations that link the channel to migraine pain. In addition, the therapeutic possibilities are discussed, as targeting the channel seems an interesting therapeutic approach to reduce nociceptor activation and to decrease pain.
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49
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Lengyel M, Czirják G, Jacobson DA, Enyedi P. TRESK and TREK-2 two-pore-domain potassium channel subunits form functional heterodimers in primary somatosensory neurons. J Biol Chem 2020; 295:12408-12425. [PMID: 32641496 DOI: 10.1074/jbc.ra120.014125] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/06/2020] [Indexed: 01/08/2023] Open
Abstract
Two-pore-domain potassium channels (K2P) are the major determinants of the background potassium conductance. They play a crucial role in setting the resting membrane potential and regulating cellular excitability. These channels form homodimers; however, a few examples of heterodimerization have also been reported. The K2P channel subunits TRESK and TREK-2 provide the predominant background potassium current in the primary sensory neurons of the dorsal root and trigeminal ganglia. A recent study has shown that a TRESK mutation causes migraine because it leads to the formation of a dominant negative truncated TRESK fragment. Surprisingly, this fragment can also interact with TREK-2. In this study, we determined the biophysical and pharmacological properties of the TRESK/TREK-2 heterodimer using a covalently linked TRESK/TREK-2 construct to ensure the assembly of the different subunits. The tandem channel has an intermediate single-channel conductance compared with the TRESK and TREK-2 homodimers. Similar conductance values were recorded when TRESK and TREK-2 were coexpressed, demonstrating that the two subunits can spontaneously form functional heterodimers. The TRESK component confers calcineurin-dependent regulation to the heterodimer and gives rise to a pharmacological profile similar to the TRESK homodimer, whereas the presence of the TREK-2 subunit renders the channel sensitive to the selective TREK-2 activator T2A3. In trigeminal primary sensory neurons, we detected single-channel activity with biophysical and pharmacological properties similar to the TRESK/TREK-2 tandem, indicating that WT TRESK and TREK-2 subunits coassemble to form functional heterodimeric channels also in native cells.
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Affiliation(s)
- Miklós Lengyel
- Department of Physiology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Gábor Czirják
- Department of Physiology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - David A Jacobson
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Péter Enyedi
- Department of Physiology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
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Mayer F, Gunawan AL, Tso P, Aponte GW. Glucagon-like peptide 1 and glucose-dependent insulinotropic polypeptide stimulate release of substance P from TRPV1- and TRPA1-expressing sensory nerves. Am J Physiol Gastrointest Liver Physiol 2020; 319:G23-G35. [PMID: 32421358 PMCID: PMC7468754 DOI: 10.1152/ajpgi.00189.2019] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) are released from enteroendocrine cells (EECs) in response to nutrient ingestion and lower blood glucose levels by stimulation of insulin secretion and thus are defined as incretins. GLP-1 receptor (GLP-1R) expression has been identified on enteric neurons that include intrinsic afferent neurons, extrinsic spinal, and vagal sensory afferents but has not been shown to have an incretin effect through these nerves. GLP-1 and GIP enter the mesenteric lymphatic fluid (MLF) after a meal via the interstitial fluid (IF) from local tissue secretion and/or blood capillaries. We tested if MLF could induce diet-dependent intransient increases in intracellular calcium ([Ca2+]i) in cultured sensory neurons. Postprandial rat MLF, collected from the superior mesenteric lymphatic duct, induced a significant twofold higher intransient increase in [Ca2+]i in primary-cultured sensory neurons than MLF from fasted rats. Inhibition of transient receptor potential vanilloid 1 (TRPV1) and TRPV1 and ankyrin 1 cation channels (TRPA1) with ruthenium red eliminated the difference. Substance P (SP) (a peptide that stimulates insulin secretion) sensor cells cocultured with sensory neurons showed both the GLP-1R agonist exendin-4 (Ex-4) and GIP induced transient increases in [Ca2+]i directly coupled to SP secretion in the sensory nerves. Ex-4-induced release of SP required expression of either TRPA1 or TRPV1. These data identify unrecognized actions of GLP-1 and GIP as incretins by acting as neurolymphocrines and suggest a mechanism for sensory nerves to respond to the postprandial state through MLF.NEW & NOTEWORTHY Glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) are secreted upon eating to lower blood sugar. GLP-1 and GIP were found to induce the secretion of substance P (SP) from cultured sensory nerves. SP enhances insulin secretion. Mesenteric lymphatic fluid (MLF) also stimulates sensory neurons in a diet-dependent manner. These studies identify new actions of GLP-1 and GIP as incretins and suggest a mechanism for sensory nerves to respond to diet through MLF.
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Affiliation(s)
- Fahima Mayer
- 1Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California
| | - Amanda L. Gunawan
- 1Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California
| | - Patrick Tso
- 2Department of Pathobiology and Molecular Medicine, University of Cincinnati, Reading, Ohio
| | - Gregory W. Aponte
- 1Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California
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