1
|
Zhang L, Nagel M, Olson WP, Chesler AT, O'Connor DH. Trigeminal innervation and tactile responses in mouse tongue. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.08.17.553449. [PMID: 37645855 PMCID: PMC10462066 DOI: 10.1101/2023.08.17.553449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
The mammalian tongue is richly innervated with somatosensory, gustatory and motor fibers. These form the basis of many ethologically important functions such as eating, speaking and social grooming. Despite its high tactile acuity and sensitivity, the neural basis of tongue mechanosensation remains largely mysterious. Here we explored the organization of mechanosensory afferents in the tongue and found that each lingual papilla is innervated by Piezo2 + trigeminal neurons. Notably, each fungiform papilla contained highly specialized ring-like sensory neuron terminations that asymmetrically circumscribe the taste buds. Myelinated lingual afferents in the mouse lingual papillae did not form corpuscular sensory end organs but rather had only free nerve endings. In vivo single-unit recordings from the trigeminal ganglion revealed lingual low-threshold mechanoreceptors (LTMRs) with conduction velocities in the Aδ range or above and distinct adaptation properties ranging from intermediately adapting (IA) to rapidly adapting (RA). IA units were sensitive to both static indentation and stroking, while RA units had a preference for tangential forces applied by stroking. Lingual LTMRs were not directly responsive to rapid cooling or chemicals that can induce astringent or numbing sensations. Sparse labeling of lingual afferents in the tongue revealed distinct terminal morphologies and innervation patterns in fungiform and filiform papillae. Together, our results indicate that fungiform papillae are mechanosensory structures, while suggesting a simple model that links the functional and anatomical properties of tactile sensory neurons in the tongue.
Collapse
|
2
|
Melo LIDS, Matias de Oliveira RE, Freitas Caetano de Sousa AC, de Oliveira RM, Lima MA, Fragoso ABL, Silva FJDL, Attademo FLN, Luna FDO, Pereira AF, de Oliveira MF. Antillean manatee (Trichechus manatus manatus Linnaeus, 1758) Tongue Morphology and Adaptive Herbivorous Implications. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2024; 30:160-168. [PMID: 38123367 DOI: 10.1093/micmic/ozad135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 10/31/2023] [Accepted: 11/24/2023] [Indexed: 12/23/2023]
Abstract
Morphological study of the tongue is an interesting way of understanding evolutionary processes associated with feeding habits. Therefore, the aim of the present study was to describe the tongue morphology of the Antillean manatee and to understand possible morphological relationships with its way of capturing food. Macroscopic dissections and light and scanning electron microscopy analyses of seven manatee tongues were performed. The tongue in Antillean manatees is a muscular and robust organ, divided into apex, body, and root. It is firmly adhered to the floor of the oral cavity. Lingual papillae were distributed over the entire tongue surface. They were identified as filiform papillae concentrated in the apex. Fungiform papillae were present on the apex and lateral regions. Foliate papillae were located on the dorsolateral portion of the root. Lentiform papillae were located across the dorsal tongue surface. The mucosa was lined by a keratinized stratified squamous epithelium presenting compound tubuloacinar glands and taste buds in the foliate papillae. The tongue of the Antillean manatee is similar to other Sirenia species, both of which share a completely herbivorous diet.
Collapse
Affiliation(s)
- Lucas Inácio Dos Santos Melo
- Postgraduate Program in Animal Science, Department of Biosciences, Biological and Health Sciences Center, Federal University of the Semi-Arid Region (UFERSA), Avenida Francisco Mota, 572, Bairro Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil
- National Center for Research and Conservation of Aquatic Mammals by Chico Mendes Institute for Biodiversity Conservation (CMA/ICMBio), Alexandre Herculano, 197, bairro Gonzaga, Santos, São Paulo, 11050-031, Brazil
| | - Radan Elvis Matias de Oliveira
- Postgraduate Program in Animal Science, Department of Biosciences, Biological and Health Sciences Center, Federal University of the Semi-Arid Region (UFERSA), Avenida Francisco Mota, 572, Bairro Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil
- Center for Environmental Studies and Monitoring (CEMAM), Rua Jorge Caminha, 118, bairro Centro, Areia Branca, Rio Grande do Norte, 59655-000, Brazil
- Cetáceos da Costa Branca Project, University of the State of Rio Grande do Norte (PCCB-UERN), Almino Afonso, 478, Mossoró, Rio Grande do Norte, 59610-210, Brazil
| | - Ana Caroline Freitas Caetano de Sousa
- Postgraduate Program in Animal Science, Department of Biosciences, Biological and Health Sciences Center, Federal University of the Semi-Arid Region (UFERSA), Avenida Francisco Mota, 572, Bairro Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil
| | - Rysónely Maclay de Oliveira
- Postgraduate Program in Animal Science, Department of Biosciences, Biological and Health Sciences Center, Federal University of the Semi-Arid Region (UFERSA), Avenida Francisco Mota, 572, Bairro Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil
- Cetáceos da Costa Branca Project, University of the State of Rio Grande do Norte (PCCB-UERN), Almino Afonso, 478, Mossoró, Rio Grande do Norte, 59610-210, Brazil
| | - Mariana Almeida Lima
- Postgraduate Program in Animal Science, Department of Biosciences, Biological and Health Sciences Center, Federal University of the Semi-Arid Region (UFERSA), Avenida Francisco Mota, 572, Bairro Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil
- Center for Environmental Studies and Monitoring (CEMAM), Rua Jorge Caminha, 118, bairro Centro, Areia Branca, Rio Grande do Norte, 59655-000, Brazil
- Cetáceos da Costa Branca Project, University of the State of Rio Grande do Norte (PCCB-UERN), Almino Afonso, 478, Mossoró, Rio Grande do Norte, 59610-210, Brazil
| | - Ana Bernadete Lima Fragoso
- Center for Environmental Studies and Monitoring (CEMAM), Rua Jorge Caminha, 118, bairro Centro, Areia Branca, Rio Grande do Norte, 59655-000, Brazil
- Cetáceos da Costa Branca Project, University of the State of Rio Grande do Norte (PCCB-UERN), Almino Afonso, 478, Mossoró, Rio Grande do Norte, 59610-210, Brazil
| | - Flávio José de Lima Silva
- Center for Environmental Studies and Monitoring (CEMAM), Rua Jorge Caminha, 118, bairro Centro, Areia Branca, Rio Grande do Norte, 59655-000, Brazil
- Cetáceos da Costa Branca Project, University of the State of Rio Grande do Norte (PCCB-UERN), Almino Afonso, 478, Mossoró, Rio Grande do Norte, 59610-210, Brazil
- Doctoral Program in Development and Environment (PRODEMA), Federal University of Rio Grande do Norte (UFRN), Avenida Salgado Filho, 3000, bairro Lagoa Nova, Natal, Rio Grande do Norte, 59064-741, Brazil
| | - Fernanda Loffler Niemeyer Attademo
- National Center for Research and Conservation of Aquatic Mammals by Chico Mendes Institute for Biodiversity Conservation (CMA/ICMBio), Alexandre Herculano, 197, bairro Gonzaga, Santos, São Paulo, 11050-031, Brazil
- Department of Zoology, Postgraduate Program in Animal Biology, Laboratory of Ecology, Behavior and Conservation, Federal University of Pernambuco (UFPE), Professor Morais Rego, s/n, Recife, Pernambuco, 50670-901, Brazil
| | - Fábia de Oliveira Luna
- National Center for Research and Conservation of Aquatic Mammals by Chico Mendes Institute for Biodiversity Conservation (CMA/ICMBio), Alexandre Herculano, 197, bairro Gonzaga, Santos, São Paulo, 11050-031, Brazil
| | - Alexsandra Fernandes Pereira
- Postgraduate Program in Animal Science, Department of Biosciences, Biological and Health Sciences Center, Federal University of the Semi-Arid Region (UFERSA), Avenida Francisco Mota, 572, Bairro Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil
| | - Moacir Franco de Oliveira
- Postgraduate Program in Animal Science, Department of Biosciences, Biological and Health Sciences Center, Federal University of the Semi-Arid Region (UFERSA), Avenida Francisco Mota, 572, Bairro Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil
| |
Collapse
|
3
|
Dong G, Kogan S, Venugopal N, Chang E, He L, Faal F, Shi Y, Phillips McCluskey L. Interleukin (IL)-1 Receptor Signaling Is Required for Complete Taste Bud Regeneration and the Recovery of Neural Taste Responses following Axotomy. J Neurosci 2023; 43:3439-3455. [PMID: 37015809 PMCID: PMC10184746 DOI: 10.1523/jneurosci.1355-22.2023] [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: 07/11/2022] [Revised: 03/03/2023] [Accepted: 03/07/2023] [Indexed: 04/06/2023] Open
Abstract
Experimental or traumatic nerve injury causes the degeneration of associated taste buds. Unlike most sensory systems, the sectioned nerve and associated taste buds can then regenerate, restoring neural responses to tastants. It was previously unknown whether injury-induced immune factors mediate this process. The proinflammatory cytokines, interleukin (IL)-1α and IL-1β, and their requisite receptor are strongly expressed by anterior taste buds innervated by the chorda tympani nerve. We tested taste bud regeneration and functional recovery in mice lacking the IL-1 receptor. After axotomy, the chorda tympani nerve regenerated but was initially unresponsive to tastants in both WT and Il1r KO mice. In the absence of Il1r signaling, however, neural taste responses remained minimal even >8 weeks after injury in both male and female mice, whereas normal taste function recovered by 3 weeks in WT mice. Failed recovery was because of a 57.8% decrease in regenerated taste buds in Il1r KO compared with WT axotomized mice. Il1a gene expression was chronically dysregulated, and the subset of regenerated taste buds were reinnervated more slowly and never reached full volume as progenitor cell proliferation lagged in KO mice. Il1r signaling is thus required for complete taste bud regeneration and the recovery of normal taste transmission, likely by impairing taste progenitor cell proliferation. This is the first identification of a cytokine response that promotes taste recovery. The remarkable plasticity of the taste system makes it ideal for identifying injury-induced mechanisms mediating successful regeneration and recovery.SIGNIFICANCE STATEMENT Taste plays a critical role in nutrition and quality of life. The adult taste system is highly plastic and able to regenerate following the disappearance of most taste buds after experimental nerve injury. Several growth factors needed for taste bud regeneration have been identified, but we demonstrate the first cytokine pathway required for the recovery of taste function. In the absence of IL-1 cytokine signaling, taste bud regeneration is incomplete, preventing the transmission of taste activity to the brain. These results open a new direction in revealing injury-specific mechanisms that could be harnessed to promote the recovery of taste perception after trauma or disease.
Collapse
Affiliation(s)
- Guangkuo Dong
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Schuyler Kogan
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Natasha Venugopal
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Eddy Chang
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Lianying He
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Fama Faal
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Yang Shi
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
- Division of Biostatistics and Data Science, Department of Population Health Sciences, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| | - Lynnette Phillips McCluskey
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912
| |
Collapse
|
4
|
McCaughey SA. Characterization of mouse chorda tympani responses evoked by stimulation of anterior or posterior fungiform taste papillae. Neurosci Res 2018; 141:43-51. [PMID: 29580888 DOI: 10.1016/j.neures.2018.03.006] [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: 11/23/2017] [Revised: 02/18/2018] [Accepted: 03/22/2018] [Indexed: 11/30/2022]
Abstract
Different gustatory papilla types vary in their locations on the tongue. Distinctions have often made between types, but variation within fungiform papillae has seldom been explored. Here, regional differences in fungiform papillae were investigated by flowing solutions selectively over either an anterior fungiform (AF, tongue tip) or a posterior fungiform (PF, middle third) region as taste-evoked activity was measured in the chorda tympani nerve of C57BL/6J (B6) mice. Significantly larger responses were evoked by NaCl applied to the AF than PF region, and the ENaC blocker amiloride reduced the NaCl response size only for the former. Umami synergy, based on co-presenting MSG and IMP, was larger for the AF than PF region. The regions did not differ in response size to sour chemicals, but responses to l-lysine, l-arginine, sucrose, and tetrasodium pyrophosphate were larger for the AF than PF region. Thus, fungiform papillae on the tongue tip differed from those found further back in their transduction mechanisms for salty and umami compounds. Gustatory sensitivity also showed regional variation, albeit with a complex relationship to palatability and taste quality. Overall, the data support a regional organization for the mouse tongue, with different functional zones for the anterior, middle, and posterior thirds.
Collapse
Affiliation(s)
- Stuart A McCaughey
- Department of Anatomy and Cell Biology, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, 19104, United States; Center for Medical Education, Ball State University, Muncie, IN, 47306, United States.
| |
Collapse
|
5
|
Venkatesan N, Rajapaksha P, Payne J, Goodfellow F, Wang Z, Kawabata F, Tabata S, Stice S, Beckstead R, Liu HX. Distribution of α-Gustducin and Vimentin in premature and mature taste buds in chickens. Biochem Biophys Res Commun 2016; 479:305-311. [PMID: 27639649 DOI: 10.1016/j.bbrc.2016.09.064] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 09/13/2016] [Indexed: 10/21/2022]
Abstract
The sensory organs for taste in chickens (Gallus sp.) are taste buds in the oral epithelium of the palate, base of the oral cavity, and posterior tongue. Although there is not a pan-taste cell marker that labels all chicken taste bud cells, α-Gustducin and Vimentin each label a subpopulation of taste bud cells. In the present study, we used both α-Gustducin and Vimentin to further characterize chicken taste buds at the embryonic and post-hatching stages (E17-P5). We found that both α-Gustducin and Vimentin label distinct and overlapping populations of, but not all, taste bud cells. A-Gustducin immunosignals were observed as early as E18 and were consistently distributed in early and mature taste buds in embryos and hatchlings. Vimentin immunoreactivity was initially sparse at the embryonic stages then became apparent in taste buds after hatch. In hatchlings, α-Gustducin and Vimentin immunosignals largely co-localized in taste buds. A small subset of taste bud cells were labeled by either α-Gustducin or Vimentin or were not labeled. Importantly, each of the markers was observed in all of the examined taste buds. Our data suggest that the early onset of α-Gustducin in taste buds might be important for enabling chickens to respond to taste stimuli immediately after hatch and that distinctive population of taste bud cells that are labeled by different molecular markers might represent different cell types or different phases of taste bud cells. Additionally, α-Gustducin and Vimentin can potentially be used as molecular markers of all chicken taste buds in whole mount tissue.
Collapse
Affiliation(s)
- Nandakumar Venkatesan
- Regenerative Bioscience Center, Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA
| | - Prasangi Rajapaksha
- Regenerative Bioscience Center, Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA
| | - Jason Payne
- Department of Poultry Sciences, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA
| | - Forrest Goodfellow
- Regenerative Bioscience Center, Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA
| | - Zhonghou Wang
- Regenerative Bioscience Center, Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA
| | - Fuminori Kawabata
- Laboratory of Functional Anatomy, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - Shoji Tabata
- Laboratory of Functional Anatomy, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - Steven Stice
- Regenerative Bioscience Center, Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA
| | - Robert Beckstead
- Department of Poultry Sciences, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA
| | - Hong-Xiang Liu
- Regenerative Bioscience Center, Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA, USA.
| |
Collapse
|
6
|
Rakov H, Engels K, Hönes GS, Strucksberg KH, Moeller LC, Köhrle J, Zwanziger D, Führer D. Sex-specific phenotypes of hyperthyroidism and hypothyroidism in mice. Biol Sex Differ 2016; 7:36. [PMID: 27559466 PMCID: PMC4995626 DOI: 10.1186/s13293-016-0089-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 08/10/2016] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Thyroid dysfunction is more common in the female population, however, the impact of sex on disease characteristics has rarely been addressed. Using a murine model, we asked whether sex has an influence on phenotypes, thyroid hormone status, and thyroid hormone tissue response in hyper- and hypothyroidism. METHODS Hypo- and hyperthyroidism were induced in 5-month-old female and male wildtype C57BL/6N mice, by LoI/MMI/ClO4 (-) or T4 i.p. treatment over 7 weeks, and control animals underwent sham treatment (N = 8 animals/sex/treatment). Animals were investigated for impact of sex on body weight, food and water intake, body temperature, heart rate, behaviour (locomotor activity, motor coordination, and strength), liver function, serum thyroid hormone status, and cellular TH effects on gene expression in brown adipose tissue, heart, and liver. RESULTS Male and female mice showed significant differences in behavioural, functional, metabolic, biochemical, and molecular traits of hyper- and hypothyroidism. Hyperthyroidism resulted in increased locomotor activity in female mice but decreased muscle strength and motor coordination preferably in male animals. Hypothyroidism led to increased water intake in male but not female mice and significantly higher serum cholesterol in male mice. Natural sex differences in body temperature, body weight gain, food and water intake were preserved under hyperthyroid conditions. In contrast, natural sex differences in heart rate disappeared with TH excess and deprivation. The variations of hyper- or hypothyroid traits of male and female mice were not explained by classical T3/T4 serum state. TH serum concentrations were significantly increased in female mice under hyperthyroidism, but no sex differences were found under eu- or hypothyroid conditions. Interestingly, analysis of expression of TH target genes and TH transporters revealed little sex dependency in heart, while sex differences in target genes were present in liver and brown adipose tissue in line with altered functional and metabolic traits of hyper- and hypothyroidism. CONCLUSIONS These data demonstrate that the phenotypes of hypo- and hyperthyroidism differ between male and female mice and indicate that sex is an important modifier of phenotypic manifestations.
Collapse
Affiliation(s)
- Helena Rakov
- Division of Laboratory Research Department of Endocrinology and Metabolism, Clinical Chemistry, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany
| | - Kathrin Engels
- Division of Laboratory Research Department of Endocrinology and Metabolism, Clinical Chemistry, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany
| | - Georg Sebastian Hönes
- Division of Laboratory Research Department of Endocrinology and Metabolism, Clinical Chemistry, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany
| | - Karl-Heinz Strucksberg
- Charité-Universitätsmedizin Berlin, Institute of Experimental Endocrinology, 13353 Berlin, Germany
| | - Lars Christian Moeller
- Division of Laboratory Research Department of Endocrinology and Metabolism, Clinical Chemistry, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany
| | - Josef Köhrle
- Charité-Universitätsmedizin Berlin, Institute of Experimental Endocrinology, 13353 Berlin, Germany
| | - Denise Zwanziger
- Division of Laboratory Research Department of Endocrinology and Metabolism, Clinical Chemistry, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany
| | - Dagmar Führer
- Division of Laboratory Research Department of Endocrinology and Metabolism, Clinical Chemistry, University Hospital Essen, University Duisburg-Essen, 45122 Essen, Germany
| |
Collapse
|
7
|
Gaillard D, Xu M, Liu F, Millar SE, Barlow LA. β-Catenin Signaling Biases Multipotent Lingual Epithelial Progenitors to Differentiate and Acquire Specific Taste Cell Fates. PLoS Genet 2015; 11:e1005208. [PMID: 26020789 PMCID: PMC4447363 DOI: 10.1371/journal.pgen.1005208] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Accepted: 04/13/2015] [Indexed: 11/29/2022] Open
Abstract
Continuous taste bud cell renewal is essential to maintain taste function in adults; however, the molecular mechanisms that regulate taste cell turnover are unknown. Using inducible Cre-lox technology, we show that activation of β-catenin signaling in multipotent lingual epithelial progenitors outside of taste buds diverts daughter cells from a general epithelial to a taste bud fate. Moreover, while taste buds comprise 3 morphological types, β-catenin activation drives overproduction of primarily glial-like Type I taste cells in both anterior fungiform (FF) and posterior circumvallate (CV) taste buds, with a small increase in Type II receptor cells for sweet, bitter and umami, but does not alter Type III sour detector cells. Beta-catenin activation in post-mitotic taste bud precursors likewise regulates cell differentiation; forced activation of β-catenin in these Shh+ cells promotes Type I cell fate in both FF and CV taste buds, but likely does so non-cell autonomously. Our data are consistent with a model where β-catenin signaling levels within lingual epithelial progenitors dictate cell fate prior to or during entry of new cells into taste buds; high signaling induces Type I cells, intermediate levels drive Type II cell differentiation, while low levels may drive differentiation of Type III cells. Taste is a fundamental sense that helps the body determine whether food can be ingested. Taste dysfunction can be a side effect of cancer therapies, can result from an alteration of the renewal capacities of the taste buds, and is often associated with psychological distress and malnutrition. Thus, understanding how taste cells renew throughout adult life, i.e. how newly born cells replace old cells as they die, is essential to find potential therapeutic targets to improve taste sensitivity in patients suffering taste dysfunction. Here we show that a specific molecular pathway, Wnt/β-catenin signaling, controls renewal of taste cells by regulating separate stages of taste cell turnover. We show that activating this pathway directs the newly born cells to become primarily a specific taste cell type whose role is to support the other taste cells and help them work efficiently.
Collapse
Affiliation(s)
- Dany Gaillard
- Department of Cell & Developmental Biology, and the Rocky Mountain Taste & Smell Center, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States of America
| | - Mingang Xu
- Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Cell & Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Fei Liu
- Institute for Regenerative Medicine at Scott & White Hospital, Texas A&M University System Health Science Center, Temple, Texas, United States of America
| | - Sarah E. Millar
- Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Linda A. Barlow
- Department of Cell & Developmental Biology, and the Rocky Mountain Taste & Smell Center, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States of America
- * E-mail:
| |
Collapse
|
8
|
Dana RM, McCaughey SA. Gustatory responses of the mouse chorda tympani nerve vary based on region of tongue stimulation. Chem Senses 2015; 40:335-44. [PMID: 25899807 DOI: 10.1093/chemse/bjv015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Different parts of the mouth vary in their taste responsiveness and gustatory transduction components. However, there have been few attempts to consider regional variation among areas innervated by a single nerve branch or containing only one type of gustatory papilla. Here, we examined whether taste-elicited responses of a single nerve, the chorda tympani (CT), depend on where taste solutions are delivered on the tongue in mice. In experiment 1, multiunit CT responses to NaCl and sucrose were larger if sapid taste solutions were applied to the tongue tip, which contains the anterior-most fungiform papillae, than if they were flowed over fungiform and foliate papillae on the posterior tongue. Further, the epithelial sodium channel (ENaC) blocker amiloride suppressed NaCl responses to a greater degree for the tongue tip. In experiment 2, CT nerve responses were compared between the tongue tip and a region further back that contained only fungiform papillae. NaCl and sucrose solutions applied to posterior fungiform papillae produced smaller responses than did those elicited by the same taste stimuli applied to anterior fungiform papillae on the tongue tip. Amiloride suppressed the response to NaCl delivered to the anterior fungiform but not posterior fungiform papillae. These results indicate that the CT response is tongue-region dependent in the mouse. Furthermore, the spatial location of a fungiform papilla provides important information about its properties, such as whether sodium taste transduction is mediated by amiloride-sensitive ENaCs.
Collapse
Affiliation(s)
- Rachel M Dana
- Department of Biology, Ball State University, Muncie, IN 47306, USA and
| | - Stuart A McCaughey
- Center for Medical Education, IUSM-Muncie at Ball State University, Muncie, IN 47306, USA
| |
Collapse
|
9
|
Chen ML, Liu SS, Zhang GH, Quan Y, Zhan YH, Gu TY, Qin YM, Deng SP. Effects of early intraoral acesulfame-K stimulation to mice on the adult's sweet preference and the expression of α-gustducin in fungiform papilla. Chem Senses 2013; 38:447-55. [PMID: 23537561 DOI: 10.1093/chemse/bjt001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Exposure to artificial sweetener acesulfame-K (AK) at early development stages may influence the adult sweet preference and the periphery gustatory system. We observed that the intraoral AK stimulation to mice from postnatal day 4 (P4) to weaning decreased the preference thresholds for AK and sucrose solutions in adulthood, with the preference pattern unchanged. The preference scores were increased in the exposure group significantly when compared with the control group at a range of concentrations for AK or sucrose solution. Meanwhile, more α-Gustducin-labeled fungiform taste buds and cells in a single taste bud were induced from week 7 by the early intraoral AK stimulation. However, the growth in the number of α-Gustducin-positive taste bud or positive cell number per taste bud occurred only in the anterior region, the rostral 1-mm part, but not in the intermediate region, the caudal 4-mm part, of the anterior two-third of the tongue containing fungiform papillae. This work extends our previous observations and provides new information about the developmental and regional expression pattern of α-Gustducin in mouse fungiform taste bud under early AK-stimulated conditions.
Collapse
Affiliation(s)
- Meng-Ling Chen
- Sensory Science Laboratory, School of Bioscience and Food Engineering, Changshu Institute of Technology, Changshu 215500, PR China.
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Zhang GH, Chen ML, Liu SS, Zhan YH, Quan Y, Qin YM, Deng SP. Facilitation of the development of fungiform taste buds by early intraoral acesulfame-K stimulation to mice. J Neural Transm (Vienna) 2010; 117:1261-4. [DOI: 10.1007/s00702-010-0480-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Accepted: 08/30/2010] [Indexed: 10/19/2022]
|