1
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Roe K. The epithelial cell types and their multi-phased defenses against fungi and other pathogens. Clin Chim Acta 2024; 563:119889. [PMID: 39117034 DOI: 10.1016/j.cca.2024.119889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2024] [Revised: 07/21/2024] [Accepted: 07/23/2024] [Indexed: 08/10/2024]
Abstract
Mucus and its movements are essential to epithelial tissue immune defenses against pathogens, including fungal pathogens, which can infect respiratory, gastrointestinal or the genito-urinary tracts. Several epithelial cell types contribute to their immune defense. This review focuses on the respiratory tract because of its paramount importance, but the observations will apply to epithelial cell defenses of other mucosal tissue, including the gastrointestinal and genito-urinary tracts. Mucus and its movements can enhance or degrade the immune defenses of the respiratory tract, particularly the lungs. The enhancements include inhaled pathogen entrapments, including fungal pathogens, pollutants and particulates, for their removal. The detriments include smaller lung airway obstructions by mucus, impairing the physical removal of pathogens and impairing vital transfers of oxygen and carbon dioxide between the alveolar circulatory system and the pulmonary air. Inflammation, edema and/or alveolar cellular damage can also reduce vital transfers of oxygen and carbon dioxide between the lung alveolar circulatory system and the pulmonary air. Furthermore, respiratory tract defenses are affected by several fatty acid mediators which activate cellular receptors to manipulate neutrophils, macrophages, dendritic cells, various innate lymphoid cells including the natural killer cells, T cells, γδ T cells, mucosal-associated invariant T cells, NKT cells and mast cells. These mediators include the inflammatory and frequently immunosuppressive prostaglandins and leukotrienes, and the special pro-resolving mediators, which normally resolve inflammation and immunosuppression. The total effects on the various epithelial cell and immune cell types, after exposures to pathogens, pollutants or particulates, will determine respiratory tract health or disease.
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Affiliation(s)
- Kevin Roe
- Retired United States Patent and Trademark Office, San Jose, CA, United States.
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2
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Pifferi M, Boner A, Maj D, Michelucci A, Donzelli G, Cangiotti AM, Guazzo R, Bertolucci G, Bertini V, Doccioli C, Piazza M, Valetto A, Caligo MA, Peroni D, Bush A. Impact of TAS2R38 polymorphisms on nasal nitric oxide and Pseudomonas infections in primary ciliary dyskinesia: relation to genotype. Thorax 2024:thorax-2024-221396. [PMID: 39181709 DOI: 10.1136/thorax-2024-221396] [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: 01/08/2024] [Accepted: 08/04/2024] [Indexed: 08/27/2024]
Abstract
OBJECTIVE Primary ciliary dyskinesia (PCD) severity has been related to genotype and levels of nasal nitric oxide (nNO). The most common TAS2R38 haplotypes (PAV/PAV, PAV/AVI, AVI/AVI) encoding the bitter taste receptor can affect nNO levels and thus could play a role in the susceptibility to respiratory infections. We assessed the impact of these polymorphisms on nNO production and Pseudomonas aeruginosa (P.a.) infections in different PCD genotypes. METHODS Prospective, longitudinal, single-centre study in patients with PCD with known genotype and one of three TAS2R38 haplotypes evaluated for up to 10 years. We related nNO values to TAS2R38 haplotypes in all patients, and in the three most frequent genotypes (CCDC39/CCDC40, DNAH5, DNAH11). In the genetic group(s) with different mean trends of nNO in relation to the polymorphism, we evaluated longitudinal lung function as a clinical outcome measure. We also studied any associations between the prevalence of chronic P.a. infection and PAV alleles. Linear mixed-effects models were used to evaluate longitudinal associations. RESULTS 119 patients with PCD underwent 1116 study visits. Only in the DNAH11 mutations group was there a mean trend of nNO production which was significantly higher in PAV/PAV than AVI/AVI haplotype (p=0.033), with a better trend in spirometric and plethysmographic parameters. In patients with DNAH11 mutations the PAV allele was also associated with a significantly reduced prevalence of chronic P.a. INFECTION CONCLUSION TAS2R38 may be a modifier gene for PCD severity, but only in mild phenotype disease. Further study of TAS2R38 polymorphisms might enable new management strategies to prevent chronic P.a. INFECTIONS
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Affiliation(s)
- Massimo Pifferi
- Department of Pediatrics, Pisa University Hospital, Pisa, Italy
| | - Attilio Boner
- Department of Surgical Science, Dentistry, Gynecology and Pediatrics, Integrated University Hospital of Verona, Verona, Italy
| | - Debora Maj
- Department of Pediatrics, Pisa University Hospital, Pisa, Italy
| | - Angela Michelucci
- Laboratory of Molecular Genetics, Pisa University Hospital, Pisa, Italy
| | - Gabriele Donzelli
- Institute of Clinical Physiology National Research Council, Pisa, Italy
| | - Angela M Cangiotti
- Institute of Normal Human Morphology, Electron Microscopy Unit, University Hospital of Ancona Umberto I G M Lancisi G Salesi, Ancona, Italy
| | - Raffaella Guazzo
- Laboratory of Electron Microscopy, Pathology Unit, Siena University Hospital, Siena, Italy
| | | | - Veronica Bertini
- Laboratory of Cytogenetics, Pisa University Hospital, Pisa, Italy
| | - Chiara Doccioli
- Department of Statistics, Computer Science and Applications, University of Florence, Florence, Italy
| | - Michele Piazza
- Department of Surgical Science, Dentistry, Gynecology and Pediatrics, Integrated University Hospital of Verona, Verona, Italy
| | - Angelo Valetto
- Laboratory of Cytogenetics, Pisa University Hospital, Pisa, Italy
| | | | - Diego Peroni
- Department of Pediatrics, Pisa University Hospital, Pisa, Italy
| | - Andrew Bush
- Imperial College London, London, UK
- Royal Brompton Hospital, London, UK
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3
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Li N, Li C, Zheng A, Liu W, Shi Y, Jiang M, Xiao Y, Qiu Z, Qiu Y, Jia A. Ultra-high-performance liquid chromatography-mass spectrometry combined with molecular docking and molecular dynamics simulation reveals the source of bitterness in the traditional Chinese medicine formula Runchang-Tongbian. Biomed Chromatogr 2024; 38:e5929. [PMID: 38881323 DOI: 10.1002/bmc.5929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 03/20/2024] [Indexed: 06/18/2024]
Abstract
The Runchang-Tongbian (RCTB) formula is a traditional Chinese medicine (TCM) formula consisting of four herbs, namely Cannabis Fructus (Huomaren), Rehmanniae Radix (Dihuang), Atractylodis Macrocephalae Rhizoma (Baizhu), and Aurantii Fructus (Zhiqiao). It is widely used clinically because of its beneficial effect on constipation. However, its strong bitter taste leads to poor patient compliance. The bitter components of TCM compounds are complex and numerous, and inhibiting the bitter taste of TCM has become a major clinical challenge. Here, we use ultra-high-performance liquid chromatography coupled with mass spectrometry (UPLC-MS) and high-resolution mass spectrometry to identify 59 chemical components in the TCM compound RCTB formula. Next, four bitter taste receptors, TAS2R39, TAS2R14, TAS2R7, and TAS2R5, which are tightly bound to the compounds in RCTB, were screened as molecular docking receptors using the BitterX database. The top-three-scoring receptor-small-molecule complexes for each of the four receptors were selected for molecular dynamics simulation. Finally, seven bitter components were identified, namely six flavonoids (rhoifolin, naringin, poncirin, diosmin, didymin, and narirutin) and one phenylpropanoid (purpureaside C). Thus, we proposed a new method for identifying the bitter components in TCM compounds, which provides a theoretical reference for bitter taste inhibition in TCM compounds.
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Affiliation(s)
- Na Li
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Chunyu Li
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Aizhu Zheng
- The Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, China
| | - Weipeng Liu
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Yuwen Shi
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Mengcheng Jiang
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Yusheng Xiao
- Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
| | - Zhidong Qiu
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Ye Qiu
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Ailing Jia
- College of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
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4
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Yu S, Xu C, Tang X, Wang L, Hu L, Li L, Zhou X, Li Q. Exendin-4 blockade of T1R2/T1R3 activation improves Pseudomonas aeruginosa-related pneumonia in an animal model of chemically induced diabetes. Inflamm Res 2024; 73:1185-1201. [PMID: 38748233 PMCID: PMC11214611 DOI: 10.1007/s00011-024-01891-8] [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: 01/13/2024] [Revised: 05/06/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024] Open
Abstract
OBJECTIVE Poorly controlled diabetes frequently exacerbates lung infection, thereby complicating treatment strategies. Recent studies have shown that exendin-4 exhibits not only hypoglycemic but also anti-inflammatory properties. This study aimed to explore the role of exendin-4 in lung infection with diabetes, as well as its association with NOD1/NF-κB and the T1R2/T1R3 sweet taste receptor. METHODS 16HBE human bronchial epithelial cells cultured with 20 mM glucose were stimulated with lipopolysaccharide (LPS) isolated from Pseudomonas aeruginosa (PA). Furthermore, Sprague‒Dawley rats were fed a high-fat diet, followed by intraperitoneal injection of streptozotocin and intratracheal instillation of PA. The levels of TNF-α, IL-1β and IL-6 were evaluated using ELISAs and RT‒qPCR. The expression of T1R2, T1R3, NOD1 and NF-κB p65 was assayed using western blotting and immunofluorescence staining. Pathological changes in the lungs of the rats were observed using hematoxylin and eosin (H&E) staining. RESULTS At the same dose of LPS, the 20 mM glucose group produced more proinflammatory cytokines (TNF-α, IL-1β and IL-6) and had higher levels of T1R2, T1R3, NOD1 and NF-κB p65 than the normal control group (with 5.6 mM glucose). However, preintervention with exendin-4 significantly reduced the levels of the aforementioned proinflammatory cytokines and signaling molecules. Similarly, diabetic rats infected with PA exhibited increased levels of proinflammatory cytokines in their lungs and increased expression of T1R2, T1R3, NOD1 and NF-κB p65, and these effects were reversed by exendin-4. CONCLUSIONS Diabetic hyperglycemia can exacerbate inflammation during lung infection, promote the increase in NOD1/NF-κB, and promote T1R2/T1R3. Exendin-4 can ameliorate PA-related pneumonia with diabetes and overexpression of NOD1/NF-κB. Additionally, exendin-4 suppresses T1R2/T1R3, potentially through its hypoglycemic effect or through a direct mechanism. The correlation between heightened expression of T1R2/T1R3 and an intensified inflammatory response in lung infection with diabetes requires further investigation.
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Affiliation(s)
- Shanjun Yu
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Chaoqun Xu
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Emergency and Trauma College, Hainan Medical University, Haikou, Hainan, 579199, China
| | - Xiang Tang
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Lijun Wang
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Lihua Hu
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Liang Li
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China
| | - Xiangdong Zhou
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China.
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China.
| | - Qi Li
- Department of Respiratory Medicine, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan, 570102, China.
- Hainan Province Clinical Medical Center of Respiratory Disease, Haikou, Hainan, 570102, China.
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Lee RJ, Adappa ND, Palmer JN. Akt activator SC79 stimulates antibacterial nitric oxide generation in human nasal epithelial cells in vitro. Int Forum Allergy Rhinol 2024; 14:1147-1162. [PMID: 38197521 PMCID: PMC11219270 DOI: 10.1002/alr.23318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 12/05/2023] [Accepted: 12/26/2023] [Indexed: 01/11/2024]
Abstract
BACKGROUND The role of Akt in nasal immunity is unstudied. Akt phosphorylates and activates endothelial nitric oxide synthase (eNOS) expressed in epithelial ciliated cells. Nitric oxide (NO) production by ciliated cells can have antibacterial and antiviral effects. Increasing nasal NO may be a useful antipathogen strategy in chronic rhinosinusitis (CRS). We previously showed that small-molecule Akt activator SC79 induces nasal cell NO production and suppresses IL-8 via the transcription factor Nrf-2. We hypothesized that SC79 NO production may additionally have antibacterial effects. METHODS NO production was measured using fluorescent dye DAF-FM. We tested effects of SC79 during co-culture of Pseudomonas aeruginosa with primary nasal epithelial cells, using CFU counting and live-dead staining to quantify bacterial killing. Pharmacology determined the mechanism of SC79-induced NO production and tested dependence on Akt. RESULTS SC79 induced dose-dependent, Akt-dependent NO production in nasal epithelial cells. The NO production required eNOS and Akt. The NO released into the airway surface liquid killed P. aeruginosa. No toxicity (LDH release) or inflammatory effects (IL8 transcription) were observed over 24 h. CONCLUSIONS Together, these data suggest multiple immune pathways are stimulated by SC79, with antipathogen effects. This in vitro pilot study suggests that a small-molecule Akt activator may have clinical utility in CRS or respiratory other infection settings, warranting future in vivo studies.
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Affiliation(s)
- Robert J. Lee
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine
- Department of Physiology, University of Pennsylvania Perelman School of Medicine
| | - Nithin D. Adappa
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine
| | - James N. Palmer
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine
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6
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Li YH, Yang YS, Xue YB, Lei H, Zhang SS, Qian J, Yao Y, Zhou R, Huang L. G protein subunit G γ13-mediated signaling pathway is critical to the inflammation resolution and functional recovery of severely injured lungs. eLife 2024; 12:RP92956. [PMID: 38836551 DOI: 10.7554/elife.92956] [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] [Indexed: 06/06/2024] Open
Abstract
Tuft cells are a group of rare epithelial cells that can detect pathogenic microbes and parasites. Many of these cells express signaling proteins initially found in taste buds. It is, however, not well understood how these taste signaling proteins contribute to the response to the invading pathogens or to the recovery of injured tissues. In this study, we conditionally nullified the signaling G protein subunit Gγ13 and found that the number of ectopic tuft cells in the injured lung was reduced following the infection of the influenza virus H1N1. Furthermore, the infected mutant mice exhibited significantly larger areas of lung injury, increased macrophage infiltration, severer pulmonary epithelial leakage, augmented pyroptosis and cell death, greater bodyweight loss, slower recovery, worsened fibrosis and increased fatality. Our data demonstrate that the Gγ13-mediated signal transduction pathway is critical to tuft cells-mediated inflammation resolution and functional repair of the damaged lungs.To our best knowledge, it is the first report indicating subtype-specific contributions of tuft cells to the resolution and recovery.
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Affiliation(s)
- Yi-Hong Li
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Yi-Sen Yang
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Yan-Bo Xue
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Hao Lei
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Sai-Sai Zhang
- College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Junbin Qian
- Zhejiang Provincial Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Institute of Genetics, Zhejiang University School of Medicine, Hangzhou, China
- Cancer Center, Zhejiang University, Hangzhou, China
| | - Yushi Yao
- Institute of Immunology and Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Ruhong Zhou
- College of Life Sciences, Zhejiang University, Hangzhou, China
- Zhejiang University Shanghai Institute for Advanced Study, Shanghai, Shanghai, China
| | - Liquan Huang
- College of Life Sciences, Zhejiang University, Hangzhou, China
- Zhejiang University Shanghai Institute for Advanced Study, Shanghai, Shanghai, China
- Monell Chemical Senses Center, Philadelphia, United States
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7
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Lee RJ, Adappa ND, Palmer JN. Effects of Akt Activator SC79 on Human M0 Macrophage Phagocytosis and Cytokine Production. Cells 2024; 13:902. [PMID: 38891035 PMCID: PMC11171788 DOI: 10.3390/cells13110902] [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: 04/25/2024] [Revised: 05/17/2024] [Accepted: 05/22/2024] [Indexed: 06/20/2024] Open
Abstract
Akt is an important kinase in metabolism. Akt also phosphorylates and activates endothelial and neuronal nitric oxide (NO) synthases (eNOS and nNOS, respectively) expressed in M0 (unpolarized) macrophages. We showed that e/nNOS NO production downstream of bitter taste receptors enhances macrophage phagocytosis. In airway epithelial cells, we also showed that the activation of Akt by a small molecule (SC79) enhances NO production and increases levels of nuclear Nrf2, which reduces IL-8 transcription during concomitant stimulation with Toll-like receptor (TLR) 5 agonist flagellin. We hypothesized that SC79's production of NO in macrophages might likewise enhance phagocytosis and reduce the transcription of some pro-inflammatory cytokines. Using live cell imaging of fluorescent biosensors and indicator dyes, we found that SC79 induces Akt activation, NO production, and downstream cGMP production in primary human M0 macrophages. This was accompanied by a reduction in IL-6, IL-8, and IL-12 production during concomitant stimulation with bacterial lipopolysaccharide, an agonist of pattern recognition receptors including TLR4. Pharmacological inhibitors suggested that this effect was dependent on Akt and Nrf2. Together, these data suggest that several macrophage immune pathways are regulated by SC79 via Akt. A small-molecule Akt activator may be useful in some infection settings, warranting future in vivo studies.
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Affiliation(s)
- Robert J. Lee
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (N.D.A.); (J.N.P.)
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Nithin D. Adappa
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (N.D.A.); (J.N.P.)
| | - James N. Palmer
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (N.D.A.); (J.N.P.)
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Xu X, Yin J, Yang Y, Liu H, Yu J, Luo X, Zhang Y, Song X. Advances in co-pathogenesis of the united airway diseases. Respir Med 2024; 225:107580. [PMID: 38484897 DOI: 10.1016/j.rmed.2024.107580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 02/02/2024] [Accepted: 02/22/2024] [Indexed: 03/19/2024]
Abstract
According to the concept of "united airway diseases", the airway is a single organ in which upper and lower airway diseases are commonly comorbid. A range of inflammatory factors have been found to play an important role in the chain reaction of upper and lower airway diseases. However, the amount of research on this concept remains limited. The underlying mechanism of the relationship between typical diseases of the united airway, such as asthma, allergic rhinitis, and chronic sinusitis, also needs to be further explored. This review highlights the interaction between upper and lower respiratory diseases gathered from epidemiological, histoembryology, neural mechanistic, microbiological, and clinical studies, revealing the relationship between the upper and lower respiratory tracts.
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Affiliation(s)
- Xinjun Xu
- Department of Otolaryngology, Head and Neck Surgery. Yantai Yuhuangding Hospital, Qingdao University, Yantai, China; Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China
| | - Jiali Yin
- Department of Otolaryngology, Head and Neck Surgery. Yantai Yuhuangding Hospital, Qingdao University, Yantai, China; Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China
| | - Yujuan Yang
- Department of Otolaryngology, Head and Neck Surgery. Yantai Yuhuangding Hospital, Qingdao University, Yantai, China; Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China
| | - Huifang Liu
- Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China; The 2nd School of Clinical Medicine of Binzhou Medical University, Yantai, Shandong, China
| | - Jingyi Yu
- Department of Otolaryngology, Head and Neck Surgery. Yantai Yuhuangding Hospital, Qingdao University, Yantai, China; Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China
| | - Xianghuang Luo
- Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China; School of Clinical Medicine, Weifang Medical University, Weifang, 261042, China
| | - Yu Zhang
- Department of Otolaryngology, Head and Neck Surgery. Yantai Yuhuangding Hospital, Qingdao University, Yantai, China; Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China.
| | - Xicheng Song
- Department of Otolaryngology, Head and Neck Surgery. Yantai Yuhuangding Hospital, Qingdao University, Yantai, China; Shandong Provincial Clinical Research Center for Otorhinolaryngologic Diseases, Yantai, China.
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Pallante L, Cannariato M, Androutsos L, Zizzi EA, Bompotas A, Hada X, Grasso G, Kalogeras A, Mavroudi S, Di Benedetto G, Theofilatos K, Deriu MA. VirtuousPocketome: a computational tool for screening protein-ligand complexes to identify similar binding sites. Sci Rep 2024; 14:6296. [PMID: 38491261 PMCID: PMC10943019 DOI: 10.1038/s41598-024-56893-7] [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: 01/09/2024] [Accepted: 03/12/2024] [Indexed: 03/18/2024] Open
Abstract
Protein residues within binding pockets play a critical role in determining the range of ligands that can interact with a protein, influencing its structure and function. Identifying structural similarities in proteins offers valuable insights into their function and activation mechanisms, aiding in predicting protein-ligand interactions, anticipating off-target effects, and facilitating the development of therapeutic agents. Numerous computational methods assessing global or local similarity in protein cavities have emerged, but their utilization is impeded by complexity, impractical automation for amino acid pattern searches, and an inability to evaluate the dynamics of scrutinized protein-ligand systems. Here, we present a general, automatic and unbiased computational pipeline, named VirtuousPocketome, aimed at screening huge databases of proteins for similar binding pockets starting from an interested protein-ligand complex. We demonstrate the pipeline's potential by exploring a recently-solved human bitter taste receptor, i.e. the TAS2R46, complexed with strychnine. We pinpointed 145 proteins sharing similar binding sites compared to the analysed bitter taste receptor and the enrichment analysis highlighted the related biological processes, molecular functions and cellular components. This work represents the foundation for future studies aimed at understanding the effective role of tastants outside the gustatory system: this could pave the way towards the rationalization of the diet as a supplement to standard pharmacological treatments and the design of novel tastants-inspired compounds to target other proteins involved in specific diseases or disorders. The proposed pipeline is publicly accessible, can be applied to any protein-ligand complex, and could be expanded to screen any database of protein structures.
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Affiliation(s)
- Lorenzo Pallante
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, PolitoBIOMedLab, 10129, Torino, Italy
| | - Marco Cannariato
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, PolitoBIOMedLab, 10129, Torino, Italy
| | | | - Eric A Zizzi
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, PolitoBIOMedLab, 10129, Torino, Italy
| | - Agorakis Bompotas
- Industrial Systems Institute, Athena Research Center, 265 04, Patras, Greece
| | - Xhesika Hada
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, PolitoBIOMedLab, 10129, Torino, Italy
| | - Gianvito Grasso
- Dalle Molle Institute for Artificial Intelligence IDSIA USI-SUPSI, 6962, Lugano-Viganello, Switzerland
| | | | - Seferina Mavroudi
- Department of Nursing, School of Health Rehabilitation Sciences, University of Patras, 265 04, Patras, Greece
| | | | | | - Marco A Deriu
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, PolitoBIOMedLab, 10129, Torino, Italy.
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10
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Holmes IA, Durso AM, Myers CR, Hendry TA. Changes in capture availability due to infection can lead to detectable biases in population-level infectious disease parameters. PeerJ 2024; 12:e16910. [PMID: 38436008 PMCID: PMC10909344 DOI: 10.7717/peerj.16910] [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: 01/26/2023] [Accepted: 01/17/2024] [Indexed: 03/05/2024] Open
Abstract
Correctly identifying the strength of selection that parasites impose on hosts is key to predicting epidemiological and evolutionary outcomes of host-parasite interactions. However, behavioral changes due to infection can alter the capture probability of infected hosts and thereby make selection difficult to estimate by standard sampling techniques. Mark-recapture approaches, which allow researchers to determine if some groups in a population are less likely to be captured than others, can be used to identify infection-driven capture biases. If a metric of interest directly compares infected and uninfected populations, calculated detection probabilities for both groups may be useful in identifying bias. Here, we use an individual-based simulation to test whether changes in capture rate due to infection can alter estimates of three key metrics: 1) reduction in the reproductive success of infected parents relative to uninfected parents, 2) the relative risk of infection for susceptible genotypes compared to resistant genotypes, and 3) changes in allele frequencies between generations. We explore the direction and underlying causes of the biases that emerge from these simulations. Finally, we argue that short series of mark-recapture sampling bouts, potentially implemented in under a week, can yield key data on detection bias due to infection while not adding a significantly higher burden to disease ecology studies.
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Affiliation(s)
- Iris A. Holmes
- Department of Microbiology, Cornell University, Ithaca, NY, United States
- Cornell Institute of Host Microbe Interactions and Disease, Cornell University, Ithaca, NY, United States
| | - Andrew M. Durso
- Department of Biological Sciences, Florida Gulf Coast University, Ft. Myers, FL, USA
| | - Christopher R. Myers
- Center for Advanced Computing & Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, United States
| | - Tory A. Hendry
- Department of Microbiology, Cornell University, Ithaca, NY, United States
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11
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Talmon M, Massara E, Quaregna M, De Battisti M, Boccafoschi F, Lecchi G, Puppo F, Bettega Cajandab MA, Salamone S, Bovio E, Boldorini R, Riva B, Pollastro F, Fresu LG. Bitter taste receptor (TAS2R) 46 in human skeletal muscle: expression and activity. Front Pharmacol 2023; 14:1205651. [PMID: 37771728 PMCID: PMC10522851 DOI: 10.3389/fphar.2023.1205651] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 07/27/2023] [Indexed: 09/30/2023] Open
Abstract
Bitter taste receptors are involved not only in taste perception but in various physiological functions as their anatomical location is not restricted to the gustatory system. We previously demonstrated expression and activity of the subtype hTAS2R46 in human airway smooth muscle and broncho-epithelial cells, and here we show its expression and functionality in human skeletal muscle cells. Three different cellular models were used: micro-dissected human skeletal tissues, human myoblasts/myotubes and human skeletal muscle cells differentiated from urine stem cells of healthy donors. We used qPCR, immunohistochemistry and immunofluorescence analysis to evaluate gene and protein hTAS2R46 expression. In order to explore receptor activity, cells were incubated with the specific bitter ligands absinthin and 3ß-hydroxydihydrocostunolide, and calcium oscillation and relaxation were evaluated by calcium imaging and collagen assay, respectively, after a cholinergic stimulus. We show, for the first time, experimentally the presence and functionality of a type 2 bitter receptor in human skeletal muscle cells. Given the tendentially protective role of the bitter receptors starting from the oral cavity and following also in the other ectopic sites, and given its expression already at the myoblast level, we hypothesize that the bitter receptor can play an important role in the development, maintenance and in the protection of muscle tissue functions.
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Affiliation(s)
- Maria Talmon
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Erika Massara
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Martina Quaregna
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Marta De Battisti
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Francesca Boccafoschi
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Giulia Lecchi
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Federico Puppo
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | | | - Stefano Salamone
- Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy
| | - Enrica Bovio
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Renzo Boldorini
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
| | - Beatrice Riva
- Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy
| | - Federica Pollastro
- Department of Pharmaceutical Sciences, University of Piemonte Orientale, Novara, Italy
| | - Luigia G. Fresu
- Department of Health Sciences, School of Medicine, University of Piemonte Orientale, Novara, Italy
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12
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Kouakou YI, Lee RJ. Interkingdom Detection of Bacterial Quorum-Sensing Molecules by Mammalian Taste Receptors. Microorganisms 2023; 11:1295. [PMID: 37317269 DOI: 10.3390/microorganisms11051295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/11/2023] [Accepted: 05/13/2023] [Indexed: 06/16/2023] Open
Abstract
Bitter and sweet taste G protein-coupled receptors (known as T2Rs and T1Rs, respectively) were originally identified in type II taste cells on the tongue, where they signal perception of bitter and sweet tastes, respectively. Over the past ~15 years, taste receptors have been identified in cells all over the body, demonstrating a more general chemosensory role beyond taste. Bitter and sweet taste receptors regulate gut epithelial function, pancreatic β cell secretion, thyroid hormone secretion, adipocyte function, and many other processes. Emerging data from a variety of tissues suggest that taste receptors are also used by mammalian cells to "eavesdrop" on bacterial communications. These receptors are activated by several quorum-sensing molecules, including acyl-homoserine lactones and quinolones from Gram-negative bacteria such as Pseudomonas aeruginosa, competence stimulating peptides from Streptococcus mutans, and D-amino acids from Staphylococcus aureus. Taste receptors are an arm of immune surveillance similar to Toll-like receptors and other pattern recognition receptors. Because they are activated by quorum-sensing molecules, taste receptors report information about microbial population density based on the chemical composition of the extracellular environment. This review summarizes current knowledge of bacterial activation of taste receptors and identifies important questions remaining in this field.
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Affiliation(s)
- Yobouet Ines Kouakou
- Department of Otorhinolaryngology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Robert J Lee
- Department of Otorhinolaryngology and Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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13
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Spector BM, Shusterman DJ, Zhao K. Nasal nitric oxide flux from the paranasal sinuses. Curr Opin Allergy Clin Immunol 2023; 23:22-28. [PMID: 36373691 PMCID: PMC10170969 DOI: 10.1097/aci.0000000000000871] [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] [Indexed: 11/16/2022]
Abstract
PURPOSE OF REVIEW Upper airway nitric oxide (NO) is physiologically important in airway regulation and defense, and can be modulated by various airway inflammatory conditions, including allergic rhinitis and chronic rhinosinusitis - with and without polyposis. Paranasal sinuses serve as a NO 'reservoir', with concentrations typically exceeding those measured in lower airway (fractional exhaled NO or FeNO) by a few orders of magnitude. However, the dynamics of NO flux between the paranasal sinuses and main nasal airway, which are critical to respiratory NO emission, are poorly understood. RECENT FINDINGS Historically, NO emissions were thought to be contributed mostly by the maxillary sinuses (the largest sinuses) and active air movement (convection). However, recent anatomically-accurate computational modeling studies based on patients' CT scans showed that the ethmoid sinuses and diffusive transport dominate the process. SUMMARY These new findings may have a substantial impact on our view of nasal NO emission mechanisms and sinus physiopathology in general.
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Affiliation(s)
- Barak M. Spector
- Department of Otolaryngology – Head and Neck Surgery, The Ohio State University, Columbus, Ohio
| | - Dennis J. Shusterman
- Upper Airway Biology Laboratory, Department of Medicine, University of California, San Francisco, California, USA
| | - Kai Zhao
- Department of Otolaryngology – Head and Neck Surgery, The Ohio State University, Columbus, Ohio
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14
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Holmes IA, Grundler MC. Phylogenetically under-dispersed gut microbiomes are not correlated with host genomic heterozygosity in a genetically diverse reptile community. Mol Ecol 2023; 32:258-274. [PMID: 36221927 PMCID: PMC9797449 DOI: 10.1111/mec.16733] [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: 07/20/2021] [Revised: 09/09/2022] [Accepted: 09/15/2022] [Indexed: 12/31/2022]
Abstract
While key elements of fitness in vertebrate animals are impacted by their microbiomes, the host genetic characteristics that factor into microbiome composition are not fully understood. Here, we correlate host genomic heterozygosity and gut microbiome phylogenetic diversity across a community of reptiles in southwestern New Mexico to test hypotheses about the behaviour of host genes that drive microbiome assembly. We find that microbiome communities are phylogenetically under-dispersed relative to random expectations, and that host heterozygosity is not correlated with microbiome diversity. Our analyses reinforce results from functional genomic work that identify conserved host immune and nonimmune genes as key players in microbiome assembly, rather than gene families that rely on heterozygosity for their function.
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Affiliation(s)
- Iris A. Holmes
- Museum of Zoology and Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109 USA
- Cornell Institute of Host Microbe Interactions and Disease and Department of Microbiology, Cornell University, Ithaca, NY 14853 USA
| | - Michael C. Grundler
- Museum of Zoology and Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109 USA
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA 90095 USA
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15
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Carey RM, Palmer JN, Adappa ND, Lee RJ. Loss of CFTR function is associated with reduced bitter taste receptor-stimulated nitric oxide innate immune responses in nasal epithelial cells and macrophages. Front Immunol 2023; 14:1096242. [PMID: 36742335 PMCID: PMC9890060 DOI: 10.3389/fimmu.2023.1096242] [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: 11/11/2022] [Accepted: 01/03/2023] [Indexed: 01/19/2023] Open
Abstract
Introduction Bitter taste receptors (T2Rs) are G protein-coupled receptors identified on the tongue but expressed all over the body, including in airway cilia and macrophages, where T2Rs serve an immune role. T2R isoforms detect bitter metabolites (quinolones and acyl-homoserine lactones) secreted by gram negative bacteria, including Pseudomonas aeruginosa, a major pathogen in cystic fibrosis (CF). T2R activation by bitter bacterial products triggers calcium-dependent nitric oxide (NO) production. In airway cells, the NO increases mucociliary clearance and has direct antibacterial properties. In macrophages, the same pathway enhances phagocytosis. Because prior studies linked CF with reduced NO, we hypothesized that CF cells may have reduced T2R/NO responses, possibly contributing to reduced innate immunity in CF. Methods Immunofluorescence, qPCR, and live cell imaging were used to measure T2R localization, calcium and NO signaling, ciliary beating, and antimicrobial responses in air-liquid interface cultures of primary human nasal epithelial cells and immortalized bronchial cell lines. Immunofluorescence and live cell imaging was used to measure T2R signaling and phagocytosis in primary human monocyte-derived macrophages. Results Primary nasal epithelial cells from both CF and non-CF patients exhibited similar T2R expression, localization, and calcium signals. However, CF cells exhibited reduced NO production also observed in immortalized CFBE41o- CF cells and non-CF 16HBE cells CRISPR modified with CF-causing mutations in the CF transmembrane conductance regulator (CFTR). NO was restored by VX-770/VX-809 corrector/potentiator pre-treatment, suggesting reduced NO in CF cells is due to loss of CFTR function. In nasal cells, reduced NO correlated with reduced ciliary and antibacterial responses. In primary human macrophages, inhibition of CFTR reduced NO production and phagocytosis during T2R stimulation. Conclusions Together, these data suggest an intrinsic deficiency in T2R/NO signaling caused by loss of CFTR function that may contribute to intrinsic susceptibilities of CF patients to P. aeruginosa and other gram-negative bacteria that activate T2Rs.
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Affiliation(s)
- Ryan M Carey
- Department of Otorhinolaryngology-Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - James N Palmer
- Department of Otorhinolaryngology-Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Nithin D Adappa
- Department of Otorhinolaryngology-Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Robert J Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States.,Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
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16
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Pifferi M, Boner AL, Gracci S, Fonnesu R, Maj D, Donzelli G, Michelucci A, Cangiotti A, Bertini V, Valetto A, Caligo MA, Miccoli M, Peroni D, Bush A. Longitudinal Nitric Oxide Levels and Infections by Ultrastructure and Genotype in Primary Ciliary Dyskinesia. Chest 2022; 162:1265-1276. [PMID: 35777446 DOI: 10.1016/j.chest.2022.06.019] [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: 07/25/2021] [Revised: 06/12/2022] [Accepted: 06/18/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND We hypothesized that differences in nasal nitric oxide (nNO) and fractional exhaled nitric oxide (Feno) relate to prognosis in primary ciliary dyskinesia (PCD). RESEARCH QUESTION What is the relationship between baseline values and longitudinal evolution of nNO and Feno and ultrastructure, genotype, and respiratory infections in PCD? STUDY DESIGN AND METHODS Prospective, longitudinal, single-center study in adults and children evaluated biannually for up to 10 years. We compared cross-sectional and longitudinal values of nNO and Feno in ultrastructural (inner dynein arm [IDA] and microtubular disorganization [MTD]) and genetic (CCDC39 and CCDC40) groups known to have worse pulmonary function with patients within the ultrastructural and genetic groups with a better prognosis. Linear mixed-effects models were used to evaluate longitudinal associations. RESULTS One hundred forty-one patients with PCD underwent 1,014 visits. At enrollment, no differences were found in children in nNO or Feno between the IDA and MTD group and the other ultrastructural groups. In adults, nNO (P = .038) and Feno (P = .032) were significantly lower in the IDA and MTD group than in all other combined ultrastructural groups. Feno values were significantly lower in the CCDC39 and CCDC40 group than in the DNAH5 and DNAH11 combined genotype group (P = .033) and in all other genotypes (P = .032). The IDA and MTD group showed a significant decline in nNO with age (P < .01) compared with other ultrastructural groups who showed stable levels. The CCDC39 and CCDC40 group showed the steepest decline in nNO over time (P < .01) compared with all other genotypes. A higher nNO was associated with lower likelihood of any positive bacterial isolate from the lower respiratory tract (P = .008). Changes in Feno over time did not differ between structural groups or genotypes. INTERPRETATION Lower nNO in patients with PCD with genetic and ultrastructural changes associated with greater lung function decline may be related to worse prognosis, but whether a low nNO is causal needs further study. If lower nNO directly results in a poorer prognosis, strategies augmenting upper airway nitric oxide production may be worth evaluating.
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Affiliation(s)
- Massimo Pifferi
- Department of Paediatrics, University Hospital of Pisa, Pisa, Italy.
| | - Attilio L Boner
- Department of Paediatrics, University Hospital of Verona, Verona, Italy
| | - Serena Gracci
- Department of Paediatrics, University Hospital of Pisa, Pisa, Italy
| | - Rossella Fonnesu
- Department of Paediatrics, University Hospital of Pisa, Pisa, Italy
| | - Debora Maj
- Department of Paediatrics, University Hospital of Pisa, Pisa, Italy
| | - Gabriele Donzelli
- Department of Health Sciences, University of Florence, Florence, Italy
| | - Angela Michelucci
- Laboratory of Molecular Genetics, University Hospital of Pisa, Pisa, Italy
| | - Angela Cangiotti
- Electron Microscopy Unit, University Hospital of Ancona, Ancona, Italy
| | - Veronica Bertini
- Section of Cytogenetics, University Hospital of Pisa, Pisa, Italy
| | - Angelo Valetto
- Section of Cytogenetics, University Hospital of Pisa, Pisa, Italy
| | | | - Mario Miccoli
- Department of Clinical and Experimental Medicine, University Hospital of Pisa, Pisa, Italy
| | - Diego Peroni
- Department of Paediatrics, University Hospital of Pisa, Pisa, Italy
| | - Andrew Bush
- Imperial College and Royal Brompton Hospital, London, England
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17
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Ponnusamy V, Subramanian G, Muthuswamy K, Shanmugamprema D, Krishnan V, Velusamy T, Subramaniam S. Genetic variation in sweet taste receptors and a mechanistic perspective on sweet and fat taste sensation in the context of obesity. Obes Rev 2022; 23:e13512. [PMID: 36282093 DOI: 10.1111/obr.13512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/14/2022] [Accepted: 10/05/2022] [Indexed: 11/30/2022]
Abstract
Taste sensation enables humans to make nutritionally important decisions such as food preference and consumption. It functions as deterministic factors for unpropitious eating behavior, leading to overweight and obesity. The hedonistic feeling on consumption of fat and sugar-rich meals, in particular, has a negative influence on health. In addition, impairment in the taste receptors alters the downstream signaling of taste transduction pathway. Hence, genetic polymorphism in typical taste receptors is a predictor of taste sensitivity variance across individuals. The present review summarizes the effect of a single nucleotide polymorphism (SNP) in sweet taste receptors (T1R2/T1R3) on taste perception among individuals of various body mass index (BMI). Furthermore, in the context of obesity, we discussed the possibility of crosstalk between fat and sweet receptors as well as taste dysfunction in diseased individuals. In overall, a greater understanding of the physiological relationship between taste receptors, altered taste sensitivity, and genetic polymorphisms should lead to more effective obesity prevention approaches.
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Affiliation(s)
- Vinithra Ponnusamy
- Molecular Physiology Laboratory, Department of Biochemistry, Bharathiar University, Coimbatore, Tamilnadu, India, 641046
| | - Gowtham Subramanian
- Molecular Physiology Laboratory, Department of Biochemistry, Bharathiar University, Coimbatore, Tamilnadu, India, 641046
| | - Karthi Muthuswamy
- Molecular Physiology Laboratory, Department of Biochemistry, Bharathiar University, Coimbatore, Tamilnadu, India, 641046
| | - Deepankumar Shanmugamprema
- Molecular Physiology Laboratory, Department of Biochemistry, Bharathiar University, Coimbatore, Tamilnadu, India, 641046
| | - Vasanth Krishnan
- Molecular Biology Laboratory, Department of Botany, School of Life Sciences, Bharathiar University, Coimbatore, Tamilnadu, India, 641046
| | - Thirunavukkarasu Velusamy
- Department of Biotechnology, School of Biotechnology and Genetic Engineering, Bharathiar University, Coimbatore, Tamilnadu, India, 641046
| | - Selvakumar Subramaniam
- Molecular Physiology Laboratory, Department of Biochemistry, Bharathiar University, Coimbatore, Tamilnadu, India, 641046
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18
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Li X, Yi H. Sulfur dioxide-enhanced asthma susceptibility is involved with inhibition of bitter taste transduction in mouse lung. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2022; 95:103938. [PMID: 35907486 DOI: 10.1016/j.etap.2022.103938] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 07/12/2022] [Accepted: 07/26/2022] [Indexed: 06/15/2023]
Abstract
Sulfur dioxide (SO2) may induce asthma-like symptoms or worsen existing asthma, but the underlying mechanism is still unclear. In this study, the relationship between SO2 exposure, asthma development, and bitter taste transduction was analyzed using ovalbumin (OVA)-induced and SO2-aggravated asthma models. The results showed that twenty-seven and twelve bitter taste receptors (Tas2rs) were detectable in mouse trachea and lung, respectively, and that all of them were nearly down-regulated in OVA-induced BALB/c and C57BL/6 asthmatic mice. SO2 exposure alone did not trigger a distinct asthma-like phenotype, but the combination of SO2 and OVA allergen caused more severe asthma symptoms in mice including enhanced inflammatory cells infiltration, thickened airway walls, increased mucus secretion, and elevated expression of proinflammatory and Th2 cytokines (TNF-α, IL-4, IL-5, IL-13). Furthermore, SO2 enhanced the transcriptional repression of Tas2rs in OVA-induced asthmatic mice. These results indicated that the occurrence of mice asthma was correlated with the inhibition of bitter taste transduction, and more severe airway inflammation and injury were accompanied with an enhanced inhibition of bitter taste transduction. Our findings suggest that SO2 inhalation may amplify Th2 inflammatory responses in the lung of asthmatic mice by inhibiting bitter taste transduction, and thereby exacerbate asthma symptoms.
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Affiliation(s)
- XiuJuan Li
- School of Life Science, College of Environment and Resource, Shanxi University, Taiyuan 030006, China; Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University, Taiyuan 030001, China
| | - HuiLan Yi
- School of Life Science, College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
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19
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Kimura S, Tsuruma A, Kato E. Taste 2 Receptor Is Involved in Differentiation of 3T3-L1 Preadipocytes. Int J Mol Sci 2022; 23:ijms23158120. [PMID: 35897692 PMCID: PMC9331636 DOI: 10.3390/ijms23158120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 07/22/2022] [Accepted: 07/22/2022] [Indexed: 02/05/2023] Open
Abstract
Expression of taste 2 receptor (T2R) genes, also known as bitter taste receptor genes, has been reported in a variety of tissues. The white adipose tissue of mice has been shown to express Tas2r108, Tas2r126, Tas2r135, Tas2r137, and Tas2r143, but the function of T2Rs in adipocytes remains unclear. Here, we show that fasting and stimulation by bitter compounds both increased Tas2r expression in mouse white adipose tissue, and serum starvation and stimulation by bitter compounds both increased the expression of Tas2r genes in 3T3-L1 adipocytes, suggesting that T2Rs have functional roles in adipocytes. RNA sequencing analysis of 3T3-L1 adipocytes stimulated by epicatechin, the ligand of Tas2r126, suggested that this receptor may play a role in the differentiation of adipocytes. Overexpression of Tas2r126 in 3T3-L1 preadipocytes decreases fat accumulation after induction of differentiation and reduces the expression of adipogenic genes. Together, these results indicate that Tas2r126 may be involved in adipocyte differentiation.
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Affiliation(s)
- Shunsuke Kimura
- Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan; (S.K.); (A.T.)
- Japan Society for the Promotion of Science (JSPS), Chiyoda-ku, Tokyo 102-0083, Japan
| | - Ai Tsuruma
- Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan; (S.K.); (A.T.)
| | - Eisuke Kato
- Division of Fundamental AgriScience and Research, Research Faculty of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan
- Correspondence:
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20
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COVID-19 and Parkinson's Disease: Possible Links in Pathology and Therapeutics. Neurotox Res 2022; 40:1586-1596. [PMID: 35829997 DOI: 10.1007/s12640-022-00540-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 05/30/2022] [Accepted: 06/28/2022] [Indexed: 02/07/2023]
Abstract
The outbreak of SARs-CoV-2 with emerging new variants is leading to global health crisis and has brought a major concern for patients with comorbidities. Parkinson's disease (PD) is a motor neurodegenerative disease involving various metabolic and psychological ailments along with the common occurrence of hyposmia as observed in COVID-19 patients. In addition, the observed surplus inflammatory responses in both diseases are also alarming. Alongside, angiotensin-converting enzyme 2 (ACE2) receptor, essentially required by SARS-CoV-2 to enter the cell and dopamine decarboxylase (DDC), required for dopamine synthesis is known to co-regulate in the non-neuronal cells. Taken together, these conditions suggested the probable reciprocal pathological relation between COVID-19 and PD and also suggested that during comorbidities, the disease diagnosis and therapeutics are critical and may engender severe health complications. In this review, we discuss various events and mechanisms which may have implications for the exacerbation of PD conditions and must be taken into account during the treatment of patients.
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21
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Carey RM, Kim T, Cohen NA, Lee RJ, Nead KT. Impact of sweet, umami, and bitter taste receptor (TAS1R and TAS2R) genomic and expression alterations in solid tumors on survival. Sci Rep 2022; 12:8937. [PMID: 35624283 PMCID: PMC9142493 DOI: 10.1038/s41598-022-12788-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 05/16/2022] [Indexed: 11/18/2022] Open
Abstract
Originally identified on the tongue for their chemosensory role, the receptors for sweet, umami, and bitter taste are expressed in some cancers where they regulate important cellular processes including apoptosis and proliferation. We examined DNA mutations (n = 5103), structural variation (n = 7545), and expression (n = 6224) of genes encoding sweet or umami receptors (TAS1Rs) and bitter receptors (TAS2Rs) in 45 solid tumors subtypes compared to corresponding normal tissue using The Cancer Genome Atlas and the Genotype Tissue Expression Project databases. Expression of TAS1R and TAS2R genes differed between normal and cancer tissue, and nonsilent mutations occurred in many solid tumor taste receptor genes (~ 1-7%). Expression levels of certain TAS1Rs/TAS2Rs were associated with survival differences in 12 solid tumor subtypes. Increased TAS1R1 expression was associated with improved survival in lung adenocarcinoma (mean survival difference + 1185 days, p = 0.0191). Increased TAS2R14 expression was associated with worse survival in adrenocortical carcinoma (-1757 days, p < 0.001) and esophageal adenocarcinoma (-640 days, p = 0.0041), but improved survival in non-papillary bladder cancer (+ 343 days, p = 0.0436). Certain taste receptor genes may be associated with important oncologic pathways and could serve as biomarkers for disease outcomes.
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Affiliation(s)
- Ryan M Carey
- Department of Otorhinolaryngology - Head and Neck Surgery, Hospital of the University of Pennsylvania, 3400 Spruce Street, 5th floor Ravdin Suite A, Philadelphia, PA, 19104, USA.
| | - TaeBeom Kim
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Noam A Cohen
- Department of Otorhinolaryngology - Head and Neck Surgery, Hospital of the University of Pennsylvania, 3400 Spruce Street, 5th floor Ravdin Suite A, Philadelphia, PA, 19104, USA
- Philadelphia Veterans Affairs Medical Center, Philadelphia, PA, USA
| | - Robert J Lee
- Department of Otorhinolaryngology - Head and Neck Surgery, Hospital of the University of Pennsylvania, 3400 Spruce Street, 5th floor Ravdin Suite A, Philadelphia, PA, 19104, USA
- Department of Physiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Kevin T Nead
- Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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22
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Carey RM, Hariri BM, Adappa ND, Palmer JN, Lee RJ. HSP90 Modulates T2R Bitter Taste Receptor Nitric Oxide Production and Innate Immune Responses in Human Airway Epithelial Cells and Macrophages. Cells 2022; 11:1478. [PMID: 35563784 PMCID: PMC9101439 DOI: 10.3390/cells11091478] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 04/22/2022] [Accepted: 04/26/2022] [Indexed: 02/04/2023] Open
Abstract
Bitter taste receptors (T2Rs) are G protein-coupled receptors (GPCRs) expressed in various cell types including ciliated airway epithelial cells and macrophages. T2Rs in these two innate immune cell types are activated by bitter products, including those secreted by Pseudomonas aeruginosa, leading to Ca2+-dependent activation of endothelial nitric oxide (NO) synthase (eNOS). NO enhances mucociliary clearance and has direct antibacterial effects in ciliated epithelial cells. NO also increases phagocytosis by macrophages. Using biochemistry and live-cell imaging, we explored the role of heat shock protein 90 (HSP90) in regulating T2R-dependent NO pathways in primary sinonasal epithelial cells, primary monocyte-derived macrophages, and a human bronchiolar cell line (H441). Immunofluorescence showed that H441 cells express eNOS and T2Rs and that the bitter agonist denatonium benzoate activates NO production in a Ca2+- and HSP90-dependent manner in cells grown either as submerged cultures or at the air-liquid interface. In primary sinonasal epithelial cells, we determined that HSP90 inhibition reduces T2R-stimulated NO production and ciliary beating, which likely limits pathogen clearance. In primary monocyte-derived macrophages, we found that HSP-90 is integral to T2R-stimulated NO production and phagocytosis of FITC-labeled Escherichia coli and pHrodo-Staphylococcus aureus. Our study demonstrates that HSP90 serves as an innate immune modulator by regulating NO production downstream of T2R signaling by augmenting eNOS activation without impairing upstream Ca2+ signaling. These findings suggest that HSP90 plays an important role in airway antibacterial innate immunity and may be an important target in airway diseases such as chronic rhinosinusitis, asthma, or cystic fibrosis.
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Affiliation(s)
- Ryan M. Carey
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (B.M.H.); (N.D.A.); (J.N.P.)
| | - Benjamin M. Hariri
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (B.M.H.); (N.D.A.); (J.N.P.)
| | - Nithin D. Adappa
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (B.M.H.); (N.D.A.); (J.N.P.)
| | - James N. Palmer
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (B.M.H.); (N.D.A.); (J.N.P.)
| | - Robert J. Lee
- Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (B.M.H.); (N.D.A.); (J.N.P.)
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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Cilia Stimulatory and Antibacterial Activities of T2R Bitter Taste Receptor Agonist Diphenhydramine: Insights into Repurposing Bitter Drugs for Nasal Infections. Pharmaceuticals (Basel) 2022; 15:ph15040452. [PMID: 35455449 PMCID: PMC9025516 DOI: 10.3390/ph15040452] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 03/29/2022] [Accepted: 04/02/2022] [Indexed: 02/06/2023] Open
Abstract
T2R bitter taste receptors in airway motile cilia increase ciliary beat frequency (CBF) and nitric oxide (NO) production. Polymorphisms in some T2Rs are linked to disease outcomes in chronic rhinosinusitis (CRS) and cystic fibrosis (CF). We examined the expression of cilia T2Rs during the differentiation of human nasal epithelial cells grown at air–liquid interface (ALI). The T2R expression increased with differentiation but did not vary between CF and non-CF cultures. Treatment with Pseudomonas aeruginosa flagellin decreased the expression of diphenhydramine-responsive T2R14 and 40, among others. Diphenhydramine increased both NO production, measured by fluorescent dye DAF-FM, and CBF, measured via high-speed imaging. Increases in CBF were disrupted after flagellin treatment. Diphenhydramine impaired the growth of lab and clinical strains of P. aeruginosa, a major pathogen in CF and CF-related CRS. Diphenhydramine impaired biofilm formation of P. aeruginosa, measured via crystal violet staining, as well as the surface attachment of P. aeruginosa to CF airway epithelial cells, measured using colony-forming unit counting. Because the T2R agonist diphenhydramine increases NO production and CBF while also decreasing bacterial growth and biofilm production, diphenhydramine-derived compounds may have potential clinical usefulness in CF-related CRS as a topical therapy. However, utilizing T2R agonists as therapeutics within the context of P. aeruginosa infection may require co-treatment with anti-inflammatories to enhance T2R expression.
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Dong H, Liu J, Zhu J, Zhou Z, Tizzano M, Peng X, Zhou X, Xu X, Zheng X. Oral Microbiota-Host Interaction Mediated by Taste Receptors. Front Cell Infect Microbiol 2022; 12:802504. [PMID: 35425718 PMCID: PMC9004699 DOI: 10.3389/fcimb.2022.802504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 03/07/2022] [Indexed: 11/13/2022] Open
Abstract
Taste receptors, originally identified in taste buds, function as the periphery receptors for taste stimuli and play an important role in food choice. Cohort studies have revealed that single nucleotide polymorphisms of taste receptors such as T1R1, T1R2, T2R38 are associated with susceptibility to oral diseases like dental caries. Recent studies have demonstrated the wide expression of taste receptors in various tissues, including intestinal epithelia, respiratory tract, and gingiva, with an emerging role of participating in the interaction between mucosa surface and microorganisms via monitoring a wide range of metabolites. On the one hand, individuals with different oral microbiomes exhibited varied taste sensitivity, suggesting a potential impact of the oral microbiota composition on taste receptor function. On the other hand, animal studies and in vitro studies have uncovered that a variety of oral cells expressing taste receptors such as gingival solitary chemosensory cells, gingival epithelial cells (GECs), and gingival fibroblasts can detect bacterial signals through bitter taste receptors to trigger host innate immune responses, thus regulating oral microbial homeostasis. This review focuses on how taste receptors, particularly bitter and sweet taste receptors, mediate the oral microbiota-host interaction as well as impact the occurrence and development of oral diseases. Further studies delineating the role of taste receptors in mediating oral microbiota-host interaction will advance our knowledge in oral ecological homeostasis establishment, providing a novel paradigm and treatment target for the better management of dental infectious diseases.
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Affiliation(s)
- Hao Dong
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Jiaxin Liu
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Jianhui Zhu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou, China
- Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Zhiyan Zhou
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Marco Tizzano
- Basic and Translation Sciences, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Xian Peng
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xin Xu
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- *Correspondence: Xin Zheng, ; Xin Xu,
| | - Xin Zheng
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- *Correspondence: Xin Zheng, ; Xin Xu,
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McMahon DB, Kuek LE, Johnson ME, Johnson PO, Horn RL, Carey RM, Adappa ND, Palmer JN, Lee RJ. The bitter end: T2R bitter receptor agonists elevate nuclear calcium and induce apoptosis in non-ciliated airway epithelial cells. Cell Calcium 2022; 101:102499. [PMID: 34839223 PMCID: PMC8752513 DOI: 10.1016/j.ceca.2021.102499] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 10/21/2021] [Accepted: 10/31/2021] [Indexed: 01/03/2023]
Abstract
Bitter taste receptors (T2Rs) localize to airway motile cilia and initiate innate immune responses in retaliation to bacterial quorum sensing molecules. Activation of cilia T2Rs leads to calcium-driven NO production that increases cilia beating and directly kills bacteria. Several diseases, including chronic rhinosinusitis, COPD, and cystic fibrosis, are characterized by loss of motile cilia and/or squamous metaplasia. To understand T2R function within the altered landscape of airway disease, we studied T2Rs in non-ciliated airway cell lines and primary cells. Several T2Rs localize to the nucleus in de-differentiated cells that typically localize to cilia in differentiated cells. As cilia and nuclear import utilize shared proteins, some T2Rs may target to the nucleus in the absence of motile cilia. T2R agonists selectively elevated nuclear and mitochondrial calcium through a G-protein-coupled receptor phospholipase C mechanism. Additionally, T2R agonists decreased nuclear cAMP, increased nitric oxide, and increased cGMP, consistent with T2R signaling. Furthermore, exposure to T2R agonists led to nuclear calcium-induced mitochondrial depolarization and caspase activation. T2R agonists induced apoptosis in primary bronchial and nasal cells differentiated at air-liquid interface but then induced to a squamous phenotype by apical submersion. Air-exposed well-differentiated cells did not die. This may be a last-resort defense against bacterial infection. However, it may also increase susceptibility of de-differentiated or remodeled epithelia to damage by bacterial metabolites. Moreover, the T2R-activated apoptosis pathway occurs in airway cancer cells. T2Rs may thus contribute to microbiome-tumor cell crosstalk in airway cancers. Targeting T2Rs may be useful for activating cancer cell apoptosis while sparing surrounding tissue.
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Affiliation(s)
- Derek B. McMahon
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA,Correspondence: Derek B. McMahon, PhD or Robert J. Lee, PhD, Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA USA, 215-573-9766, (D.B.M.) or (R.J.L)
| | - Li Eon Kuek
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Madeline E. Johnson
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Paige O. Johnson
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Rachel L.J. Horn
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Ryan M. Carey
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Nithin D. Adappa
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - James N. Palmer
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Robert J. Lee
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA,Department of Physiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA,Correspondence: Derek B. McMahon, PhD or Robert J. Lee, PhD, Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA USA, 215-573-9766, (D.B.M.) or (R.J.L)
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27
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Jalševac F, Terra X, Rodríguez-Gallego E, Beltran-Debón R, Blay MT, Pinent M, Ardévol A. The Hidden One: What We Know About Bitter Taste Receptor 39. Front Endocrinol (Lausanne) 2022; 13:854718. [PMID: 35345470 PMCID: PMC8957101 DOI: 10.3389/fendo.2022.854718] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 02/04/2022] [Indexed: 12/21/2022] Open
Abstract
Over thousands of years of evolution, animals have developed many ways to protect themselves. One of the most protective ways to avoid disease is to prevent the absorption of harmful components. This protective function is a basic role of bitter taste receptors (TAS2Rs), a G protein-coupled receptor family, whose presence in extraoral tissues has intrigued many researchers. In humans, there are 25 TAS2Rs, and although we know a great deal about some of them, others are still shrouded in mystery. One in this latter category is bitter taste receptor 39 (TAS2R39). Besides the oral cavity, it has also been found in the gastrointestinal tract and the respiratory, nervous and reproductive systems. TAS2R39 is a relatively non-selective receptor, which means that it can be activated by a range of mostly plant-derived compounds such as theaflavins, catechins and isoflavones. On the other hand, few antagonists for this receptor are available, since only some flavones have antagonistic properties (all of them detailed in the document). The primary role of TAS2R39 is to sense the bitter components of food and protect the organism from harmful compounds. There is also some indication that this bitter taste receptor regulates enterohormones and in turn, regulates food intake. In the respiratory system, it may be involved in the congestion process of allergic rhinitis and may stimulate inflammatory cytokines. However, more thorough research is needed to determine the precise role of TAS2R39 in these and other tissues.
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Chen JH, Song CI, Hura N, Saraswathula A, Seal SM, Lane AP, Rowan NR. Taste receptors in CRS, what is the evidence?: a systematic review. Int Forum Allergy Rhinol 2021; 12:917-934. [PMID: 34913601 DOI: 10.1002/alr.22938] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/13/2021] [Accepted: 12/06/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND Bitter (T2Rs) and sweet (T1Rs) taste receptors are involved in the innate immune response of the sinonasal cavity and associated with chronic rhinosinusitis (CRS). Growing evidence suggests extraoral taste receptors as relevant biomarkers, but current understanding is incomplete. This systematic review synthesizes current evidence of extraoral taste receptors in CRS. METHODS PubMed, Embase, Cochrane, Web of Science, and Scopus were reviewed in accordance with Preferred Reporting Items for Systemic Reviews and Meta-Analyses (PRISMA) guidelines and included studies of genotypic and phenotypic T2R/T1R receptor status in CRS patients. RESULTS Twenty-two studies with 3,845 patients were included. Seventeen studies evaluated genotype and 10 evaluated taste phenotypes. Four of six studies examining the haplotype distribution of the T2R, TAS2R38, demonstrated increased AVI/AVI haplotype ("non-taster") frequency in CRS. Meanwhile, two studies demonstrated decreased bitter sensitivity in CRS with nasal polyposis (CRSwNP) while three other studies reported decreased bitter sensitivity only in CRS without nasal polyposis (CRSsNP). Findings regarding sweet sensitivity were mixed. Three studies with cystic fibrosis patients (n=1,393) were included. Studies investigating the association between clinical outcomes and TAS2R38 alleles were limited, but the nonfunctional combination of AVI/AVI was associated with increased utilization of sinus surgery and, in CRSsNP patients, with poorer improvement of symptoms postoperatively. CONCLUSIONS Both genotypic and phenotypic assessments of T2Rs suggest a potential association with CRS, particularly CRSsNP. However, limited evidence and mixed conclusions cloud the role of T2Rs in CRS. Future investigations should aim to increase diverse populations, broaden institutional diversity, examine T1Rs, and utilize uniform assessments. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Jonathan H Chen
- University of Maryland School of Medicine, Baltimore, MD, USA
| | | | - Nanki Hura
- Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Otolaryngology-Head and Neck Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Anirudh Saraswathula
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Stella M Seal
- Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Andrew P Lane
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Nicholas R Rowan
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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29
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D'Urso O, Drago F. Pharmacological significance of extra-oral taste receptors. Eur J Pharmacol 2021; 910:174480. [PMID: 34496302 DOI: 10.1016/j.ejphar.2021.174480] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 08/23/2021] [Accepted: 09/01/2021] [Indexed: 01/17/2023]
Abstract
It has recently been shown that taste receptors, in addition to being present in the oral cavity, exist in various extra-oral organs and tissues such as the thyroid, lungs, skin, stomach, intestines, and pancreas. Although their physiological function is not yet fully understood, it appears that they can help regulate the body's homeostasis and provide an additional defense function against pathogens. Since the vast majority of drugs are bitter, the greatest pharmacological interest is in the bitter taste receptors. In this review, we describe how bitter taste 2 receptors (TAS2Rs) induce bronchodilation and mucociliary clearance in the airways, muscle relaxation in various tissues, inhibition of thyroid stimulating hormone (TSH) in thyrocytes, and release of glucagon-like peptide-1 (GLP-1) and ghrelin in the digestive system. In fact, substances such as dextromethorphan, chloroquine, methimazole and probably glimepiride, being agonists of TAS2Rs, lead to these effects. TAS2Rs and taste 1 receptors (TAS1R2/3) are G protein-coupled receptors (GPCR). TAS1R2/3 are responsible for sweet taste perception and may induce GLP-1 release and insulin secretion. Umami taste receptors, belonging to the same superfamily of receptors, perform a similar function with regard to insulin. The sour and salty taste receptors work in a similar way, both being channel receptors sensitive to amiloride. Finally, gene-protein coupled receptor 40 (GPR40) and GPR120 for fatty taste perception are also protein-coupled receptors and may induce GLP-1 secretion and insulin release, similar to those of other receptors belonging to the same superfamily.
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Affiliation(s)
- Ottavio D'Urso
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia, 97, 95125 Catania, Italy
| | - Filippo Drago
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia, 97, 95125 Catania, Italy.
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30
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Carey RM, McMahon DB, Miller ZA, Kim T, Rajasekaran K, Gopallawa I, Newman JG, Basu D, Nead KT, White EA, Lee RJ. T2R bitter taste receptors regulate apoptosis and may be associated with survival in head and neck squamous cell carcinoma. Mol Oncol 2021; 16:1474-1492. [PMID: 34717036 PMCID: PMC8978516 DOI: 10.1002/1878-0261.13131] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 09/16/2021] [Accepted: 10/28/2021] [Indexed: 12/02/2022] Open
Abstract
Better management of head and neck squamous cell carcinomas (HNSCCs) requires a clearer understanding of tumor biology and disease risk. Bitter taste receptors (T2Rs) have been studied in several cancers, including thyroid, salivary, and GI, but their role in HNSCC has not been explored. We found that HNSCC patient samples and cell lines expressed functional T2Rs on both the cell and nuclear membranes. Bitter compounds, including bacterial metabolites, activated T2R‐mediated nuclear Ca2+ responses leading to mitochondrial depolarization, caspase activation, and ultimately apoptosis. Buffering nuclear Ca2+ elevation blocked caspase activation. Furthermore, increased expression of T2Rs in HNSCCs from The Cancer Genome Atlas is associated with improved overall survival. This work suggests that T2Rs are potential biomarkers to predict outcomes and guide treatment selection, may be leveraged as therapeutic targets to stimulate tumor apoptosis, and may mediate tumor‐microbiome crosstalk in HNSCC.
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Affiliation(s)
- Ryan M Carey
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Derek B McMahon
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Zoey A Miller
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - TaeBeom Kim
- Department of Epidemiology, Division of Cancer Prevention and Population Sciences, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Karthik Rajasekaran
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Indiwari Gopallawa
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Jason G Newman
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Devraj Basu
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Kevin T Nead
- Department of Epidemiology, Division of Cancer Prevention and Population Sciences, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.,Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Elizabeth A White
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Robert J Lee
- Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA.,Department of Physiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
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Martens K, Steelant B, Bullens DMA. Taste Receptors: The Gatekeepers of the Airway Epithelium. Cells 2021; 10:cells10112889. [PMID: 34831117 PMCID: PMC8616034 DOI: 10.3390/cells10112889] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/17/2021] [Accepted: 10/22/2021] [Indexed: 02/07/2023] Open
Abstract
Taste receptors are well known for their role in the sensation of taste. Surprisingly, the expression and involvement of taste receptors in chemosensory processes outside the tongue have been recently identified in many organs including the airways. Currently, a clear understanding of the airway-specific function of these receptors and the endogenous activating/inhibitory ligands is lagging. The focus of this review is on recent physiological and clinical data describing the taste receptors in the airways and their activation by secreted bacterial compounds. Taste receptors in the airways are potentially involved in three different immune pathways (i.e., the production of nitric oxide and antimicrobial peptides secretion, modulation of ciliary beat frequency, and bronchial smooth muscle cell relaxation). Moreover, genetic polymorphisms in these receptors may alter the patients’ susceptibility to certain types of respiratory infections as well as to differential outcomes in patients with chronic inflammatory airway diseases such as chronic rhinosinusitis and asthma. A better understanding of the function of taste receptors in the airways may lead to the development of a novel class of therapeutic molecules that can stimulate airway mucosal immune responses and could treat patients with chronic airway diseases.
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Affiliation(s)
- Katleen Martens
- Allergy and Clinical Immunology Research Group, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000 Leuven, Belgium; (K.M.); (B.S.)
- Department of Bioscience Engineering, University of Antwerp, 2020 Antwerp, Belgium
| | - Brecht Steelant
- Allergy and Clinical Immunology Research Group, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000 Leuven, Belgium; (K.M.); (B.S.)
| | - Dominique M. A. Bullens
- Allergy and Clinical Immunology Research Group, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000 Leuven, Belgium; (K.M.); (B.S.)
- Clinical Division of Pediatrics, University Hospitals Leuven, 3000 Leuven, Belgium
- Correspondence:
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32
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de Jesus VC, Singh M, Schroth RJ, Chelikani P, Hitchon CA. Association of Bitter Taste Receptor T2R38 Polymorphisms, Oral Microbiota, and Rheumatoid Arthritis. Curr Issues Mol Biol 2021; 43:1460-1472. [PMID: 34698096 PMCID: PMC8929115 DOI: 10.3390/cimb43030103] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/02/2021] [Accepted: 10/05/2021] [Indexed: 02/06/2023] Open
Abstract
The association of taste genetics and the oral microbiome in autoimmune diseases such as rheumatoid arthritis (RA) has not been reported. We explored a novel oral mucosal innate immune pathway involving the bitter taste G protein-coupled receptor T2R38. This case–control study aimed to evaluate whether T2R38 polymorphisms associate with the buccal microbial composition in RA. Genomic DNA was obtained from buccal swabs of 35 RA patients and 64 non-RA controls. TAS2R38 genotypes were determined by Sanger sequencing. The buccal microbiome was assessed by Illumina MiSeq sequencing of the V4-16S rRNA gene. Bacterial community differences were analyzed with alpha and beta diversity measures. Linear discriminant analysis effect size identified taxa discriminating between RA versus non-RA and across TAS2R38 genotypes. TAS2R38 genotype frequency was similar between RA and non-RA controls (PAV/PAV; PAV/AVI; AVI/AVI: RA 42.9%; 45.7%; 11.4% versus controls 32.8%; 48.4%; 18.8%, chi-square (2, N = 99) = 2.1, p = 0.35). The relative abundance of Porphyromonas, among others, differed between RA and non-RA controls. The relative abundance of several bacterial species also differed across TAS2R38 genotypes. These findings suggest an association between T2R38 polymorphisms and RA buccal microbial composition. However, further research is needed to understand the impact of T2R38 in oral health and RA development.
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Affiliation(s)
- Vivianne Cruz de Jesus
- Manitoba Chemosensory Biology Research Group, Department of Oral Biology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 0W4, Canada; (V.C.d.J.); (R.J.S.)
- Children’s Hospital Research Institute of Manitoba (CHRIM), Winnipeg, MB R3E 3P4, Canada
| | - Manu Singh
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8S 4K1, Canada;
| | - Robert J. Schroth
- Manitoba Chemosensory Biology Research Group, Department of Oral Biology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 0W4, Canada; (V.C.d.J.); (R.J.S.)
- Children’s Hospital Research Institute of Manitoba (CHRIM), Winnipeg, MB R3E 3P4, Canada
- Department of Preventive Dental Science, Rady Faculty of Health Sciences, Dr. Gerald Niznick College of Dentistry, University of Manitoba, Winnipeg, MB R3E 0W4, Canada
| | - Prashen Chelikani
- Manitoba Chemosensory Biology Research Group, Department of Oral Biology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3E 0W4, Canada; (V.C.d.J.); (R.J.S.)
- Children’s Hospital Research Institute of Manitoba (CHRIM), Winnipeg, MB R3E 3P4, Canada
- Correspondence: (P.C.); (C.A.H.); Tel.: +1-204-789-3539 (P.C.); +1-204-787-1851 (C.A.H.); Fax: +1-204-789-3913 (P.C.); +1-204-787-2475 (C.A.H.)
| | - Carol A. Hitchon
- Department of Internal Medicine, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB R3A 1M4, Canada
- Correspondence: (P.C.); (C.A.H.); Tel.: +1-204-789-3539 (P.C.); +1-204-787-1851 (C.A.H.); Fax: +1-204-789-3913 (P.C.); +1-204-787-2475 (C.A.H.)
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Neuropeptide Y Reduces Nasal Epithelial T2R Bitter Taste Receptor-Stimulated Nitric Oxide Production. Nutrients 2021; 13:nu13103392. [PMID: 34684394 PMCID: PMC8538228 DOI: 10.3390/nu13103392] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/22/2021] [Accepted: 09/24/2021] [Indexed: 12/30/2022] Open
Abstract
Bitter taste receptors (T2Rs) are G-protein-coupled receptors (GPCRs) expressed on the tongue but also in various locations throughout the body, including on motile cilia within the upper and lower airways. Within the nasal airway, T2Rs detect secreted bacterial ligands and initiate bactericidal nitric oxide (NO) responses, which also increase ciliary beat frequency (CBF) and mucociliary clearance of pathogens. Various neuropeptides, including neuropeptide tyrosine (neuropeptide Y or NPY), control physiological processes in the airway including cytokine release, fluid secretion, and ciliary beating. NPY levels and/or density of NPYergic neurons may be increased in some sinonasal diseases. We hypothesized that NPY modulates cilia-localized T2R responses in nasal epithelia. Using primary sinonasal epithelial cells cultured at air–liquid interface (ALI), we demonstrate that NPY reduces CBF through NPY2R activation of protein kinase C (PKC) and attenuates responses to T2R14 agonist apigenin. We find that NPY does not alter T2R-induced calcium elevation but does reduce T2R-stimulated NO production via a PKC-dependent process. This study extends our understanding of how T2R responses are modulated within the inflammatory environment of sinonasal diseases, which may improve our ability to effectively treat these disorders.
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Tammam SN, El Safy S, Ramadan S, Arjune S, Krakor E, Mathur S. Repurpose but also (nano)-reformulate! The potential role of nanomedicine in the battle against SARS-CoV2. J Control Release 2021; 337:258-284. [PMID: 34293319 PMCID: PMC8289726 DOI: 10.1016/j.jconrel.2021.07.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 07/15/2021] [Accepted: 07/15/2021] [Indexed: 02/06/2023]
Abstract
The coronavirus disease-19 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) has taken the world by surprise. To date, a worldwide approved treatment remains lacking and hence in the context of rapid viral spread and the growing need for rapid action, drug repurposing has emerged as one of the frontline strategies in the battle against SARS-CoV2. Repurposed drugs currently being evaluated against COVID-19 either tackle the replication and spread of SARS-CoV2 or they aim at controlling hyper-inflammation and the rampaged immune response in severe disease. In both cases, the target for such drugs resides in the lungs, at least during the period where treatment could still provide substantial clinical benefit to the patient. Yet, most of these drugs are administered systemically, questioning the percentage of administered drug that actually reaches the lung and as a consequence, the distribution of the remainder of the dose to off target sites. Inhalation therapy should allow higher concentrations of the drug in the lungs and lower concentrations systemically, hence providing a stronger, more localized action, with reduced adverse effects. Therefore, the nano-reformulation of the repurposed drugs for inhalation is a promising approach for targeted drug delivery to lungs. In this review, we critically analyze, what nanomedicine could and ought to do in the battle against SARS-CoV2. We start by a brief description of SARS-CoV2 structure and pathogenicity and move on to discuss the current limitations of repurposed antiviral and immune-modulating drugs that are being clinically investigated against COVID-19. This account focuses on how nanomedicine could address limitations of current therapeutics, enhancing the efficacy, specificity and safety of such drugs. With the appearance of new variants of SARS-CoV2 and the potential implication on the efficacy of vaccines and diagnostics, the presence of an effective therapeutic solution is inevitable and could be potentially achieved via nano-reformulation. The presence of an inhaled nano-platform capable of delivering antiviral or immunomodulatory drugs should be available as part of the repertoire in the fight against current and future outbreaks.
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Affiliation(s)
- Salma N. Tammam
- Department of Pharmaceutical Technology, Faculty of Pharmacy & Biotechnology, The German University in Cairo (GUC), 11835 Cairo, Egypt,Corresponding author
| | - Sara El Safy
- Department of Pharmaceutical Technology, Faculty of Pharmacy & Biotechnology, The German University in Cairo (GUC), 11835 Cairo, Egypt
| | - Shahenda Ramadan
- Department of Pharmaceutical Technology, Faculty of Pharmacy & Biotechnology, The German University in Cairo (GUC), 11835 Cairo, Egypt
| | - Sita Arjune
- Institute of Biochemistry, Department of Chemistry, Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany
| | - Eva Krakor
- Institute of Inorganic Chemistry, Department of Chemistry, , University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Sanjay Mathur
- Institute of Inorganic Chemistry, Department of Chemistry, , University of Cologne, Greinstraße 6, 50939 Cologne, Germany
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Barboza MLB, Reyno B. Taste receptors in aquatic mammals: Potential role of solitary chemosensory cells in immune responses. Anat Rec (Hoboken) 2021; 305:680-687. [PMID: 34264538 DOI: 10.1002/ar.24708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 04/30/2021] [Accepted: 05/26/2021] [Indexed: 11/07/2022]
Abstract
The sense of taste is associated with the evaluation of food and other environmental parameters such as salinity. In aquatic mammals, anatomic and behavioral evidence of the use of taste varies by species and genomic analysis of taste receptors indicates an overall reduction and, in some cases, complete loss of intact bitter and sweet taste receptors. However, the receptors used by taste buds in the oral cavity are found on cells in other areas of the body and play an important role in immune responses. In the respiratory tract, an example of such cells is solitary chemosensory cells (SCCs) which have bitter and sweet taste receptors. The bitter receptors detect chemicals given off by pathogens and initiate an innate immune response. Although many aquatic mammals may not have a role for taste in the assessment of food, they likely would benefit from the added protection that SCCs provide, especially considering respiratory diseases are a problem for many aquatic mammals. While evidence indicates that some species do not possess functional bitter receptors for taste, many do have intact bitter receptor genes and it is important for researchers to be aware of all roles for these receptors in homeostasis. Through a better understanding of the anatomy and physiology of aquatic mammal's respiratory systems, better treatment and management is possible.
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Affiliation(s)
| | - Beau Reyno
- University of Connecticut, Storrs, Connecticut, USA
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Pu Q, Guo K, Lin P, Wang Z, Qin S, Gao P, Combs C, Khan N, Xia Z, Wu M. Bitter receptor TAS2R138 facilitates lipid droplet degradation in neutrophils during Pseudomonas aeruginosa infection. Signal Transduct Target Ther 2021; 6:210. [PMID: 34083514 PMCID: PMC8175399 DOI: 10.1038/s41392-021-00602-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 03/04/2021] [Accepted: 04/01/2021] [Indexed: 02/05/2023] Open
Abstract
Bitter receptors function primarily in sensing taste, but may also have other functions, such as detecting pathogenic organisms due to their agile response to foreign objects. The mouse taste receptor type-2 member 138 (TAS2R138) is a member of the G-protein-coupled bitter receptor family, which is not only found in the tongue and nasal cavity, but also widely distributed in other organs, such as the respiratory tract, gut, and lungs. Despite its diverse functions, the role of TAS2R138 in host defense against bacterial infection is largely unknown. Here, we show that TAS2R138 facilitates the degradation of lipid droplets (LDs) in neutrophils during Pseudomonas aeruginosa infection through competitive binding with PPARG (peroxisome proliferator-activated receptor gamma) antagonist: N-(3-oxododecanoyl)-L-homoserine lactone (AHL-12), which coincidently is a virulence-bound signal produced by this bacterium (P. aeruginosa). The released PPARG then migrates from nuclei to the cytoplasm to accelerate the degradation of LDs by binding PLIN2 (perilipin-2). Subsequently, the TAS2R138-AHL-12 complex targets LDs to augment their degradation, and thereby facilitating the clearance of AHL-12 in neutrophils to maintain homeostasis in the local environment. These findings reveal a crucial role for TAS2R138 in neutrophil-mediated host immunity against P. aeruginosa infection.
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Affiliation(s)
- Qinqin Pu
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA
| | - Kai Guo
- Department of Neurology, University of Michigan, Ann Arbor, MI, USA
| | - Ping Lin
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA
- Wound Trauma Medical Center, State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Army Medical University, Chongqing, China
- Biological Science Research Center, Southwest University, Chongqing, 400716, China
| | - Zhihan Wang
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan, China
| | - Shugang Qin
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, China
| | - Pan Gao
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA
| | - Colin Combs
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA
| | - Nadeem Khan
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA.
| | - Zhenwei Xia
- Department of Pediatrics, Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China.
| | - Min Wu
- Department of Biomedical Sciences, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA.
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Abstract
PURPOSE OF REVIEW From single cells to entire organisms, biological entities are in constant communication with their surroundings, deciding what to 'allow' in, and what to reject. In very different ways, the immune and taste systems both fulfill this function, with growing evidence suggesting a relationship between the two, through shared signaling pathways, receptors, and feedback loops. The purpose of this review was to explore recent reports on taste and immunity in model animals and in humans to explore our understanding of the interplay between these systems. RECENT FINDINGS Acute infections in the upper airway, as with SARS-CoV-2, are associated with a proinflammatory state, and blunted taste perception. Further, recent findings highlight taste receptors working as immune sentinels throughout the body. Work in humans and mice also points to inflammation from obesity impacting taste, altering taste bud abundance and composition. There is accumulating evidence that taste cells, and particularly their receptors, play a role in airway and gut immunity, responsive to invading organisms. Inflammation itself may further act on taste buds and other taste receptor expressing cells throughout the body as a form of homeostatic control.
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Affiliation(s)
- Jason R Goodman
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA
| | - Robin Dando
- Department of Food Science, Cornell University, Ithaca, NY, 14853, USA.
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Abstract
Pneumonia is a common acute respiratory infection that affects the alveoli and distal airways; it is a major health problem and associated with high morbidity and short-term and long-term mortality in all age groups worldwide. Pneumonia is broadly divided into community-acquired pneumonia or hospital-acquired pneumonia. A large variety of microorganisms can cause pneumonia, including bacteria, respiratory viruses and fungi, and there are great geographical variations in their prevalence. Pneumonia occurs more commonly in susceptible individuals, including children of <5 years of age and older adults with prior chronic conditions. Development of the disease largely depends on the host immune response, with pathogen characteristics having a less prominent role. Individuals with pneumonia often present with respiratory and systemic symptoms, and diagnosis is based on both clinical presentation and radiological findings. It is crucial to identify the causative pathogens, as delayed and inadequate antimicrobial therapy can lead to poor outcomes. New antibiotic and non-antibiotic therapies, in addition to rapid and accurate diagnostic tests that can detect pathogens and antibiotic resistance will improve the management of pneumonia.
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Harmon CP, Deng D, Breslin PA. Bitter Taste Receptors (T2Rs) are Sentinels that Coordinate Metabolic and Immunological Defense Responses. CURRENT OPINION IN PHYSIOLOGY 2021; 20:70-76. [PMID: 33738371 PMCID: PMC7963268 DOI: 10.1016/j.cophys.2021.01.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In addition to being responsible for bitter taste, type 2 taste receptors (T2Rs) regulate endocrine, behavioral, and immunological responses. T2R agonists include indicators of incoming threats to metabolic homeostasis, pathogens, and irritants. This review will provide an overview of T2R-regulated processes throughout the body that function defensively. We propose a broader definition of T2Rs as chemosensory sentinels that monitor toxic, metabolic, and infectious threats and initiate defensive responses.
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Affiliation(s)
- Caroline P. Harmon
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA
| | - Daiyong Deng
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA
| | - Paul A.S. Breslin
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA
- Monell Chemical Senses Center, Philadelphia, Pennsylvania, USA
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Majak P, Molińska K, Latek M, Rychlik B, Wachulec M, Błauż A, Budniok A, Gruchała M, Lach J, Sobalska-Kwapis M, Baranowska M, Królikowska K, Strapagiel D, Majak J, Czech D, Pałczyński C, Kuna P. Upper-airway dysbiosis related to frequent sweets consumption increases the risk of asthma in children with chronic rhinosinusitis. Pediatr Allergy Immunol 2021; 32:489-500. [PMID: 33222307 DOI: 10.1111/pai.13417] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 11/04/2020] [Accepted: 11/13/2020] [Indexed: 01/26/2023]
Abstract
BACKGROUND Innate immunity response to local dysbiosis seems to be one of the most important immunologic backgrounds of chronic rhinosinusitis (CRS) and concomitant asthma. We aimed to assess clinical determinants of upper-airway dysbiosis and its effect on nasal inflammatory profile and asthma risk in young children with CRS. METHODS We recruited one hundred and thirty-three children, aged 4-8 years with doctor-diagnosed CRS with or without asthma. The following procedures were performed in all participants: face-to-face standardized Sinus and Nasal Quality of Life questionnaire, skin prick test, taste perception testing, nasopharynx swab, and sampling of the nasal mucosa. Upper-airway dysbiosis was defined separately by asthma-specific microbiome composition and reduced biodiversity. Multivariate methods were used to define the risk factors for asthma and upper-airway dysbiosis and their specific inflammatory profile of nasal mucosa. RESULTS The asthma-specific upper-airway microbiome composition reflected by the decreased ratio of Patescibacteria/Actinobacteria independently of atopy increased the risk of asthma (OR:8.32; 95%CI: 2.93-23.6). This asthma-specific microbiome composition was associated with ≥ 7/week sweet consumption (OR:2.64; 95%C:1.11-6.28), reduced biodiversity (OR:3.83; 95%CI:1.65-8.87), the presence of Staphylococcus strains in the nasopharynx (OR:4.25; 95%CI:1.12-16.1), and lower expression of beta-defensin 2, IL-5, and IL-13 in the nasal mucosa. The reduced biodiversity was associated with frequent antibiotic use and with a higher nasal expression of IL-17 and T1R3 (sweet taste receptor). In asthmatic children, reduced sweet taste perception was observed. CONCLUSIONS Specific upper-airway dysbiosis related to frequent sweet consumption, frequent antibiotic courses, and altered nasal immune function increases the risk of asthma in young children with CRS.
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Affiliation(s)
- Paweł Majak
- Department of Pediatric Pulmonology, Medical University of Lodz, Lodz, Poland
| | - Katarzyna Molińska
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
| | - Marta Latek
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
| | - Błażej Rychlik
- Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | - Marcin Wachulec
- Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | - Andrzej Błauż
- Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | | | - Martyna Gruchała
- Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | - Jakub Lach
- Biobank Lab, Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | | | - Monika Baranowska
- Biobank Lab, Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | - Klaudyna Królikowska
- Biobank Lab, Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | - Dominik Strapagiel
- Biobank Lab, Department of Molecular Biophysics, University of Lodz, Lodz, Poland
| | - Joanna Majak
- Audiology and Phoniatrics Clinic, Nofer Institute of Occupational Medicine, Lodz, Poland
| | - Dorota Czech
- Department of Paediatric Otolaryngology, Audiology and Phoniatrics, Medical University of Lodz, Lodz, Poland
| | | | - Piotr Kuna
- Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, Lodz, Poland
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Hellings PW, Steelant B. Epithelial barriers in allergy and asthma. J Allergy Clin Immunol 2021; 145:1499-1509. [PMID: 32507228 PMCID: PMC7270816 DOI: 10.1016/j.jaci.2020.04.010] [Citation(s) in RCA: 169] [Impact Index Per Article: 56.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 04/03/2020] [Accepted: 04/10/2020] [Indexed: 12/23/2022]
Abstract
The respiratory epithelium provides a physical, functional, and immunologic barrier to protect the host from the potential harming effects of inhaled environmental particles and to guarantee maintenance of a healthy state of the host. When compromised, activation of immune/inflammatory responses against exogenous allergens, microbial substances, and pollutants might occur, rendering individuals prone to develop chronic inflammation as seen in allergic rhinitis, chronic rhinosinusitis, and asthma. The airway epithelium in asthma and upper airway diseases is dysfunctional due to disturbed tight junction formation. By putting the epithelial barrier to the forefront of the pathophysiology of airway inflammation, different approaches to diagnose and target epithelial barrier defects are currently being developed. Using single-cell transcriptomics, novel epithelial cell types are being unraveled that might play a role in chronicity of respiratory diseases. We here review and discuss the current understandings of epithelial barrier defects in type 2-driven chronic inflammation of the upper and lower airways, the estimated contribution of these novel identified epithelial cells to disease, and the current clinical challenges in relation to diagnosis and treatment of allergic rhinitis, chronic rhinosinusitis, and asthma.
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Affiliation(s)
- Peter W Hellings
- Clinical Department of Otorhinolaryngology, Head and Neck Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Otorhinolaryngology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands; KU Leuven Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Unit, Leuven, Belgium; Department of Otorhinolaryngology, University Hospital Ghent, Laboratory of Upper Airway Research, Ghent, Belgium.
| | - Brecht Steelant
- KU Leuven Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Unit, Leuven, Belgium; Department of Otorhinolaryngology, Head and Neck Surgery, University of Crete School of Medicine, Heraklion, Crete, Greece
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Sell EA, Ortiz-Carpena JF, Herbert DR, Cohen NA. Tuft cells in the pathogenesis of chronic rhinosinusitis with nasal polyps and asthma. Ann Allergy Asthma Immunol 2021; 126:143-151. [PMID: 33122124 PMCID: PMC8674819 DOI: 10.1016/j.anai.2020.10.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 10/10/2020] [Accepted: 10/22/2020] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To review the latest discoveries regarding the role of tuft cells in the pathogenesis of chronic rhinosinusitis (CRS) with nasal polyposis and asthma. DATA SOURCES Reviews and primary research manuscripts were identified from PubMed, Google, and bioRxiv using the search words airway epithelium, nasal polyposis, CRS or asthma and chemoreceptor cell, solitary chemosensory cell, brush cell, microvillus cell, and tuft cell. STUDY SELECTIONS Studies were selected on the basis of novelty and likely relevance to the functions of tuft cells in chronic inflammatory diseases in the upper and lower airways. RESULTS Tuft cells coordinate a variety of immune responses throughout the body. After the activation of bitter-taste receptors, tuft cells coordinate the secretion of antimicrobial products by adjacent epithelial cells and initiate the calcium-dependent release of acetylcholine resulting in neurogenic inflammation, including mast cell degranulation and plasma extravasation. Tuft cells are also the dominant source of interleukin-25 and a significant source of cysteinyl leukotrienes that play a role in initiating inflammatory processes in the airway. Tuft cells have also been found to seem de novo in the distal airway after a viral infection, implicating these cells in dysplastic remodeling in the distal lung in the pathogenesis of asthma. CONCLUSION Tuft cells bridge innate and adaptive immunes responses and play an upstream role in initiating type 2 inflammation in the upper and possibly the lower airway. The role of tuft cells in respiratory pathophysiology must be further investigated, because tuft cells are putative high-value therapeutic targets for novel therapeutics in CRS with nasal polyps and asthma.
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Affiliation(s)
- Elizabeth A Sell
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
| | - Jorge F Ortiz-Carpena
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania
| | - De'Broski R Herbert
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania
| | - Noam A Cohen
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Division of Rhinology, Department of Otorhinolaryngology-Head and Neck Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; Corporal Michael J. Crescenz Veterans Administration Medical Center, Veterans Health Administration, United States Department of Veteran Affairs, Philadelphia, Pennsylvania; Monell Chemical Senses Center, Philadelphia, Pennsylvania
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Borowczyk J, Shutova M, Brembilla NC, Boehncke WH. IL-25 (IL-17E) in epithelial immunology and pathophysiology. J Allergy Clin Immunol 2021; 148:40-52. [PMID: 33485651 DOI: 10.1016/j.jaci.2020.12.628] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 12/08/2020] [Accepted: 12/16/2020] [Indexed: 02/07/2023]
Abstract
IL-25, also known as IL-17E, is a unique cytokine of the IL-17 family. Indeed, IL-25 exclusively was shown to strongly induce expression of the cytokines associated with type 2 immunity. Although produced by several types of immune cells, such as T cells, dendritic cells, or group 2 innate lymphoid cells, a vast amount of IL-25 derives from epithelial cells. The functions of IL-25 have been actively studied in the context of physiology and pathology of various organs including skin, airways and lungs, gastrointestinal tract, and thymus. Accumulating evidence suggests that IL-25 is a "barrier surface" cytokine whose expression depends on extrinsic environmental factors and when upregulated may lead to inflammatory disorders such as atopic dermatitis, psoriasis, or asthma. This review summarizes the progress of the recent years regarding the effects of IL-25 on the regulation of immune response and the balance between its homeostatic and pathogenic role in various epithelia. We revisit IL-25's general and tissue-specific mechanisms of action, mediated signaling pathways, and transcription factors activated in immune and resident cells. Finally, we discuss perspectives of the IL-25-based therapies for inflammatory disorders and compare them with the mainstream ones that target IL-17A.
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Affiliation(s)
- Julia Borowczyk
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | - Maria Shutova
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland
| | | | - Wolf-Henning Boehncke
- Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland; Division of Dermatology and Venereology, University Hospitals of Geneva, Geneva, Switzerland.
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44
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Affiliation(s)
- Jane Y Wu
- Department of Neurology, Center for Genetic Medicine, Lurie Cancer Center, Northwestern University Feinberg School of Medicine, Chicago, USA.
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Ho HKY, Bigliardi PL, Stelmashenko O, Ramasamy S, Postlethwaite M, Bigliardi-Qi M. Functionally expressed bitter taste receptor TAS2R14 in human epidermal keratinocytes serves as a chemosensory receptor. Exp Dermatol 2021; 30:216-225. [PMID: 33253444 DOI: 10.1111/exd.14250] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 10/30/2020] [Accepted: 11/23/2020] [Indexed: 01/23/2023]
Abstract
Traditionally, it is theorized that skin sensation is initiated when cutaneous sensory afferents and Merkel cells receive sensory stimuli, while epidermal keratinocytes were deemed to have no role. However, mounting evidence has shown that keratinocytes can initiate skin sensation by receiving sensory stimuli and transmitting sensory information to sensory afferents. Knowledge regarding the mechanisms by which keratinocytes receive exogenous stimuli is limited, with TRP channels and olfactory receptors having been proposed to serve as receptors for exogenous stimuli in keratinocytes. Recently, expression analyses have demonstrated the expression of multiple TAS2R genes in human skin. TAS2Rs are chemosensory GPCRs employed by taste cells to detect bitter-tasting substances. However, only subtypes TAS2R1 and TAS2R38 have been characterized in epidermal keratinocytes. We present evidence suggesting that subtype TAS2R14 is functionally expressed in epidermal keratinocytes. TAS2R14 transcripts and protein were detected in primary and N/TERT-1 keratinocytes. Additionally, keratinocytes responded to α-thujone, a TAS2R14 ligand, with an increase in intracellular free Ca2+ concentration. The tastant-evoked Ca2+ signals were found to be mediated by wild-type TAS2R14 and heterotrimeric G proteins. We conclude that TAS2R14 serves as a chemosensory receptor in epidermal keratinocytes and hypothesize that it enables the cells to recognize potentially harmful chemical substances.
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Affiliation(s)
- Hilary Kung-Yu Ho
- Agency for Science, Technology and Research, Institute of Medical Biology, Singapore, Singapore
| | - Paul Lorenz Bigliardi
- Department of Dermatology, University of Minnesota, Twin Cities, Minneapolis, MN, USA
| | - Olga Stelmashenko
- Agency for Science, Technology and Research, Institute of Medical Biology, Singapore, Singapore
| | - Srinivas Ramasamy
- Agency for Science, Technology and Research, Skin Research Institute Singapore, Singapore, Singapore
| | - Michael Postlethwaite
- Agency for Science, Technology and Research, Institute of Medical Biology, Singapore, Singapore
| | - Mei Bigliardi-Qi
- Department of Dermatology, University of Minnesota, Twin Cities, Minneapolis, MN, USA
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Kurtz R, Steinberg LG, Betcher M, Fowler D, Shepard BD. The Sensing Liver: Localization and Ligands for Hepatic Murine Olfactory and Taste Receptors. Front Physiol 2020; 11:574082. [PMID: 33123030 PMCID: PMC7573564 DOI: 10.3389/fphys.2020.574082] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 09/15/2020] [Indexed: 11/13/2022] Open
Abstract
Sensory receptors, including olfactory receptors (ORs), taste receptors (TRs), and opsins (Opns) have recently been found in a variety of non-sensory tissues where they have distinct physiological functions. As G protein-coupled receptors (GPCRs), these proteins can serve as important chemosensors by sensing and interpreting chemical cues in the environment. We reasoned that the liver, the largest metabolic organ in the body, is primed to take advantage of some of these sensory receptors in order to sense and regulate blood content and metabolism. In this study, we report the expression of novel hepatic sensory receptors - including 7 ORs, 6 bitter TRs, and 1 Opn - identified through a systematic molecular biology screening approach. We further determined that several of these receptors are expressed within hepatocytes, the parenchymal cells of the liver. Finally, we uncovered several agonists of the previously orphaned hepatic ORs. These compounds fall under two classes: methylpyrazines and monoterpenes. In particular, the latter chemicals are plant and fungal-derived compounds with known hepatic protective effects. Collectively, this study sheds light on the chemosensory functions of the liver and unveils potentially important regulators of hepatic homeostasis.
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Affiliation(s)
- Ryan Kurtz
- Department of Human Science, Georgetown University, Washington, DC, United States
| | - Lily G Steinberg
- Department of Human Science, Georgetown University, Washington, DC, United States
| | - Madison Betcher
- Department of Human Science, Georgetown University, Washington, DC, United States
| | - Dalton Fowler
- Department of Human Science, Georgetown University, Washington, DC, United States
| | - Blythe D Shepard
- Department of Human Science, Georgetown University, Washington, DC, United States
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Chen SI, Chiang CL, Chao CT, Chiang CK, Huang JW. Gustatory Dysfunction Is Closely Associated With Frailty in Patients With Chronic Kidney Disease. J Ren Nutr 2020; 31:49-56. [PMID: 32773236 DOI: 10.1053/j.jrn.2020.06.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 06/05/2020] [Accepted: 06/21/2020] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVE Gustatory function is frequently impaired in patients with chronic kidney disease (CKD), and the associated taste dysfunction contributes to compromised nutrition. Whether gustatory dysfunction is an underappreciated risk factor for frailty in patients with CKD remains unclear. The objective of this work was to examine the role of gustatory dysfunction as a risk factor for frailty in patients with CKD. METHODS We prospectively enrolled patients with stage 3 or higher CKD from a single institute, with their gustatory function assessed using both objective (taste strip method) and subjective approaches, and frailty identified using the Edmonton frail scale, FRAIL scale, and Study of Osteoporotic Fracture (SOF) scale. Multiple regression analyses were performed to investigate whether results from gustatory function tests independently correlated with frailty. RESULTS Among the enrolled patients with CKD, 14 (17.9%) were found to be frail. We discovered that higher taste strip scores, or better taste function, were significantly associated with a lower frail probability (odds ratio [OR] 0.74 per score, 95% confidence interval [CI] 0.57-0.97), independent of clinical features, while better subjective taste function (OR 0.84 per score, 95% CI 0.74-0.96) and better oral cavity intactness (OR, 0.94; 95% CI, 0.9-0.98) were similarly associated with a lower frail probability among patients with CKD. CONCLUSION Gustatory dysfunction may be an important risk factor for frailty in patients with CKD. It is tempting to presume that interventions aiming to ameliorate such deficits may bear the potential of reducing frailty severity in this population with a high frailty burden.
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Affiliation(s)
- Shih-I Chen
- Nephrology Division, Department of Internal Medicine, National Taiwan University Hospital BeiHu Branch and National Taiwan University College of Medicine, Taipei, Taiwan; Geriatric and Community Medicine Research Center, National Taiwan University Hospital BeiHu Branch, Taipei, Taiwan
| | - Chin-Ling Chiang
- Department of Nursing, National Taiwan University Hospital BeiHu Branch, Taipei, Taiwan
| | - Chia-Ter Chao
- Nephrology Division, Department of Internal Medicine, National Taiwan University Hospital BeiHu Branch and National Taiwan University College of Medicine, Taipei, Taiwan; Geriatric and Community Medicine Research Center, National Taiwan University Hospital BeiHu Branch, Taipei, Taiwan; Graduate Institute of Toxicology, National Taiwan University, Taipei, Taiwan.
| | - Chih-Kang Chiang
- Graduate Institute of Toxicology, National Taiwan University, Taipei, Taiwan; Department of Integrative Diagnostics and Therapeutics, National Taiwan University Hospital, Taipei, Taiwan
| | - Jenq-Wen Huang
- Nephrology Division, Department of Internal Medicine, National Taiwan University Hospital Yunlin branch, Yunlin county, Taiwan
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Zhang N, Wei X, Fan Y, Zhou X, Liu Y. Recent advances in development of biosensors for taste-related analyses. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2020.115925] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Polyphenols and taste 2 receptors. Physiological, pathophysiological and pharmacological implications. Biochem Pharmacol 2020; 178:114086. [DOI: 10.1016/j.bcp.2020.114086] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 06/03/2020] [Accepted: 06/04/2020] [Indexed: 02/08/2023]
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Piskadło-Zborowska K, Stachowiak M, Sarnowska E, Jowik R, Dżaman K. Assessment of the effect of inflammatory changes and allergic reaction on TAS2R38 receptor expression in patients with chronic sinusitis (CRS). Otolaryngol Pol 2020; 74:17-23. [PMID: 34550090 DOI: 10.5604/01.3001.0014.1474] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
<b>Background:</b> Chronic rhinosinusitis (CRS) is one of the most common health complaints affecting 15% of the world's population. Recent reports confirm the participation of sensory organs in the defense process against pathogenic microorganisms. The bitter taste receptor TAS2R38 is described to play a role in the upper airway defense system. <br><b>Purpose:</b> The purpose of this study was to assess the function of the bitter taste receptor in correlation with the severity of CRS, sensory organ disorders and allergic reaction. <br><b>Material and method: </b>The study contained 100 patients undergoing nasal surgery, divided into two groups: CRS with and without nasal polyps. The control group consisted of patients undergoing septoplasty after excluding rhinosinusitis. Sinus mucosa samples obtained during surgery were used to assess TAS2R38 expression using immunohistochemistry. The IgE level was indicated from blood samples collected from patients. The Sniffin' Sticks Test was performed. <br><b>Results:</b> CRS patients had higher expression of TAS2R38 receptor compared to controls (p = 0.0175). A statistically significantly higher TAS2R38 H-score in nasal mucosa was found among patients with a higher inflammation process in CT scan (p = 0.001), higher IgE level (p = 0,04) and an abnormal result of the Sniffin' Sticks Test. <br><b>Conclusions: </b>Patients with CRS had significant TAS2R38 receptor overexpression correlating with the severity of inflammatory changes in CT scans, abnormal perception of smells and higher IgE level. A cumulative impact was found between the inflammatory changes, smell disfunction and the severity of subjective symptoms of CRS (according to EPOS) and the intensity of cell staining (index H-score).
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Affiliation(s)
| | - Małgorzata Stachowiak
- Department of Molecular and Translational Oncology, Maria Sklodowska-Curie Institute- Oncology Center, Warsaw, Poland
| | - Elżbieta Sarnowska
- Department of Molecular and Translational Oncology, Maria Sklodowska-Curie Institute- Oncology Center, Warsaw, Poland
| | - Rafał Jowik
- Department of Otolaryngology, Miedzyleski Hospital, Warsaw, Poland
| | - Karolina Dżaman
- Otolaryngology Department, Międzyleski Specialist Hospital in Warsaw, Poland
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