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Heller Murray ES, Chao A. The Relationships Among Vocal Variability, Vocal-Articulatory Coordination, and Dysphonia in Children. J Voice 2023; 37:969.e43-969.e49. [PMID: 34272144 DOI: 10.1016/j.jvoice.2021.06.008] [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: 03/30/2021] [Revised: 06/01/2021] [Accepted: 06/10/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the relationship between vocal variability and variability of vocal-articulatory coordination in children. Furthermore, this study examined if this relationship was impacted by pediatric dysphonia. STUDY DESIGN Retrospective analysis of speech samples in the Arizona Child Acoustic Database. METHODS Speech samples from children 2-7 years of age were selected for analysis. Vocal variability was defined as the coefficient of variation (CoV) of fundamental frequency, taken from the center of sustained vowels. Variability of vocal-articulatory coordination was defined as the CoV of voice onset time (VOT) of voiceless stop consonants. Both objective and subjective measures of dysphonia were completed for each participant. RESULTS Children had a negative correlation between VOT variability and vocal variability. Further analysis indicated that this relationship was present in children with typical developmental levels of dysphonia but absent for children with moderate to severe dysphonia. Increased dysphonia severity was associated with increased vocal variability. CONCLUSION Increased VOT variability was associated with decreased vocal variability in children with dysphonia severities consistent with typical vocal development. However, this relationship was not present in children with moderate to severe dysphonia. This study suggests that future work is needed to examine the relationships between the vocal system and vocal-articulatory coordination in children with and without diagnosed voice disorders.
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Affiliation(s)
| | - Andie Chao
- Department of Communication Sciences and Disorders, Temple University, Philadelphia, Pennsylvania
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Colletti L, Heller Murray E. Voice Onset Time in Children With and Without Vocal Fold Nodules. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2023; 66:1467-1478. [PMID: 36940476 PMCID: PMC10457081 DOI: 10.1044/2023_jslhr-22-00463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 11/21/2022] [Accepted: 01/16/2023] [Indexed: 05/11/2023]
Abstract
PURPOSE Voice onset time (VOT) of voiceless consonants provides information on the coordination of the vocal and articulatory systems. This study examined whether vocal-articulatory coordination is affected by the presence of vocal fold nodules (VFNs) in children. METHOD The voices of children with VFNs (6-12 years) and age- and gender-matched vocally healthy controls were examined. VOT was calculated as the time between the voiceless stop consonant burst and the vocal onset of the vowel. Measures of the average VOT and VOT variability, defined as the coefficient of variation, were calculated. The acoustic measure of dysphonia, cepstral peak prominence (CPP), was also calculated. CPP provides information about the overall periodicity of the signal, with more dysphonic voices having lower CPP values. RESULTS There were no significant differences in either average VOT or VOT variability between the VFN and control groups. VOT variability and average VOT were both significantly predicted by the interaction between Group and CPP. There was a significant negative correlation between CPP and VOT variability in the VFN group, but no significant relationship was found in the control group. CONCLUSIONS Unlike previous studies with adults, there were no group differences in average VOT or VOT variability in this study. However, children with VFNs who were more dysphonic had increased VOT variability, suggestive of a relationship between dysphonia severity and control of vocal onset during speech production.
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Affiliation(s)
- Lauren Colletti
- Department of Communication Sciences and Disorders, College of Public Health, Temple University, Philadelphia, PA
| | - Elizabeth Heller Murray
- Department of Communication Sciences and Disorders, College of Public Health, Temple University, Philadelphia, PA
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Sato K, Chitose SI, Sato F, Sato K, Ono T, Umeno H. Metabolic Roles of Colony-Forming Tissue Stem Cells in the Maculae Flavae of Newborn Vocal Fold In Vivo. J Voice 2022:S0892-1997(22)00351-4. [PMID: 36588014 DOI: 10.1016/j.jvoice.2022.11.002] [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: 06/26/2022] [Revised: 10/29/2022] [Accepted: 11/01/2022] [Indexed: 01/03/2023]
Abstract
OBJECTIVES Tissue stem cells in the maculae flavae (a stem cell niche) of the human vocal fold form colonies in vivo like stem cells in vitro. However, the roles of colony-forming aggregated cells in the maculae flavae in vivo have not yet been determined. This study investigated the glycolysis, of the colony-forming aggregated cells in the maculae flavae of the human newborn vocal fold in vivo. METHODS Three normal newborn vocal folds were investigated under light microscopy with immunohistochemistry and transmission electron microscopy. RESULTS Colony-forming aggregated cells in the newborn maculae flavae strongly expressed glucose transporter-1 and glycolytic enzymes (hexokinase II, glyceraldehyde-3-phosphate dehydrogenase and lactate dehydrogenase A). The colony-forming aggregated cells did not express phosphofructokinase-1 (rate-limiting enzyme of regular glucose metabolism pathway) but expressed glucose-6-phosphate dehydrogenase (rate-limiting enzyme) indicating the cells relied more on the pentose phosphate pathway. The colony-forming aggregated cells' strong expression of lactate dehydrogenase A indicated that they rely more on anaerobic glycolysis in an anaerobic microenvironment. Mitochondrial cristae of the colony-forming aggregated cells in the newborn maculae flavae were sparse. Consequently, the microstructural features of the mitochondria suggested that their metabolic activity and oxidative phosphorylation were low. CONCLUSIONS The colony-forming aggregated cells in the maculae flavae of the newborn vocal fold seemed to rely more on anaerobic glycolysis using the pentose phosphate pathway for energy supply in vivo. Microstructural features of the mitochondria and the glycolytic enzyme expression of the colony-forming aggregated cells suggested that the oxidative phosphorylation activity was low. Already at birth, in the anaerobic microenvironment of the macular flavae in vivo, there is likely a complex cross-talk regarding metabolism between the colony-forming aggregated cells along the adhesion machinery and chemical signaling pathways which reduces toxic oxygen species and is favorable to maintaining the stemness and undifferentiated states of the tissue stem cells.
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Affiliation(s)
- Kiminori Sato
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan.
| | - Shun-Ichi Chitose
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Fumihiko Sato
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Kiminobu Sato
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Takeharu Ono
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Hirohito Umeno
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Fukuoka, Japan
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Hamilton NJI. The life-cycle and restoration of the human vocal fold. Laryngoscope Investig Otolaryngol 2022; 8:168-176. [PMID: 36846403 PMCID: PMC9948577 DOI: 10.1002/lio2.993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 10/20/2022] [Accepted: 11/30/2022] [Indexed: 12/23/2022] Open
Abstract
Objective To better understand the challenges of designing therapies to treat damaged vocal fold lamina propria, it is essential to understand the biophysical and pathophysiological mechanisms involved in vocal fold development, maintenance, injury, and aging. This review critically analyses these points to try and direct future efforts and new strategies toward science-based solutions. Data Sources & Review Methods MEDLINE, Ovid Embase, and Wed of Science databases were used to identify relevant literature. A scoping review was performed following the preferred reporting items for systematic reviews and meta-analyses extension for scoping reviews checklist. Results The layered arrangement of the vocal fold, develops during early childhood and is maintained during adulthood unless injury occurs. The stellate cells of the macular flava are likely to be important in this process. The capacity for vocal fold regeneration and growth is lost during adulthood and repair results in the deposition of fibrous tissue from resident fibroblasts. With advancing age, viscoelastic tissue declines, possibly due to cell senescence. Strategies aimed at replacing fibrous tissue within the vocal folds must either stimulate resident cells or implant new cells to secrete healthy extracellular protein. Injection of basic fibroblast growth factor is the most widely reported therapy that aims to achieve this. Conclusions The pathways involved in vocal fold development, maintenance and aging are incompletely understood. Improved understanding has the potential to identify new treatment targets that could potentially overcome loss of vocal fold vibratory tissue.
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Affiliation(s)
- Nick J. I. Hamilton
- Head & Neck Academic Centre, UCL Division of Surgery and Interventional SciencesUniversity College LondonLondonUK,Department of LaryngologyThe Royal National Ear Nose & Throat hospital (University College London Hospitals NHS Trust)LondonUK
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Sato K, Chitose SI, Sato K, Sato F, Ono T, Umeno H. Glycolysis of Tissue Stem Cells in the Macula Flava of Newborn Vocal Fold. J Voice 2022:S0892-1997(22)00193-X. [PMID: 35879212 DOI: 10.1016/j.jvoice.2022.06.030] [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: 06/01/2022] [Revised: 06/22/2022] [Accepted: 06/23/2022] [Indexed: 11/23/2022]
Abstract
OBJECTIVES There is growing evidence that the cells in the maculae flavae are tissue stem cells and the maculae flavae are a stem cell niche of the human vocal fold mucosa. This study investigated the metabolic activity, especially glycolysis, of the tissue stem cells in the maculae flavae of the human newborn vocal fold. METHODS Three normal human newborn vocal folds obtained from autopsy cases were investigated using immunohistochemistry. RESULTS Among the three phenotypes of cells (cobblestone-like polygonal cells, vocal fold stellate cell-like cells and fibroblast-like spindle cells) in the newborn maculae flavae, a small number of cobblestone-like polygonal cells strongly expressed glucose transporter-1. All three phenotypes of cells in the newborn maculae flavae expressed glycolytic enzymes (hexokinase II, glyceraldehyde-3-phosphate dehydrogenase and lactate dehydrogenase A). The cells did not express phosphofructokinase-1 (rate-limiting enzyme of regular glucose metabolism pathway) but sparsely express glucose-6-phosphate dehydrogenase (rate-limiting enzyme) indicating the cells relied more on the pentose phosphate pathway. The cells' expression of lactate dehydrogenase A suggests the maculae flavae of the newborn vocal fold is likely to be an anaerobic microenvironment where cells perform anaerobic glycolysis. CONCLUSIONS The present study is consistent with the hypothesis that the tissue stem cells in the maculae flavae of the newborn vocal fold seem to rely more on anaerobic glycolysis, especially by the pentose phosphate pathway, for energy supply. Already at birth, the metabolism of the tissue stem cells in the maculae flavae of the newborn vocal fold is likely to prevent the formation of toxic reactive oxygen species and is likely favorable to maintaining the stemness and undifferentiated states of the tissue stem cells in the stem cell system.
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Affiliation(s)
- Kiminori Sato
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan.
| | - Shun-Ichi Chitose
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Kiminobu Sato
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Fumihiko Sato
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Takeharu Ono
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Hirohito Umeno
- Department of Otolaryngology-Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
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Ercan N, Demirel F, Yeşillik S, Bolat A, Kartal Ö. Efficacy of sodium hyaluronate in relieving nasal symptoms of children with intermittent allergic rhinitis: a randomized controlled trial. Eur Arch Otorhinolaryngol 2021; 279:2925-2934. [PMID: 34529156 DOI: 10.1007/s00405-021-07073-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 09/05/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE Nasal irrigation is recommended as add-on therapy in patients with intermittent allergic rhinitis (AR). We aimed to evaluate the clinical efficacy of adding hyaluronic acid (HA) or normal saline solution (NSS) to nasal corticosteroid (NC) therapy as add-on therapy in improving quality of life and reducing nasal symptom scores of children with intermittent AR compared to NC therapy. METHOD In this 28-day long, open-label, randomized controlled trial, one puff of NC was administered once a day through both nostrils of 76 children with SAR (6-12 years old), whose Total Nasal Symptom Score (TNSS) was ≥ 4. Twenty-six patients received NC only (Group 1); 24 patients received NSS (Group 2), and 26 patients received HA (Group 3) twice a day by means of nasal douche device. Pediatric Rhinoconjunctivitis Quality of Life Questionnaire (PRQLQ) and TNSS were measured as subjective parameters, and nasal eosinophil count (NEC) in nasal cytology, nasal airflow (NAF), and resistance were measured as objective parameters. RESULTS No significant difference was found in post-treatment between groups in terms of TNSS, PRQLQ, and NEC values. Mean values of post-treatment left NAF of the groups were significantly different (p = 0.030), and the mean value of Group 3 was the highest (mean ± SD = 247.62 ± 155.8 ccm/sn). In comparing pre- and post-treatment intragroup mean total NAR (TNAR) values, a statistically significant decrease was recorded only in group three (p = 0.025). CONCLUSION The addition of HA to NC as an adjunct therapy in children with intermittent AR has limited beneficial effects in our study and deserves further investigation. TRIAL REGISTRY The clinical trial registration number ID:NCT04752956.
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Affiliation(s)
- Nazli Ercan
- Department of Child Health and Diseases, Division of Pediatric Immunology and Allergy, University of Health Sciences Turkey, Gülhane Education and Research Hospital, 06010, Ankara, Turkey.
| | - Fevzi Demirel
- Department of Immunology and Allergy, University of Health Sciences Turkey, Gülhane Education and Research Hospital, 06010, Ankara, Turkey
| | - Sait Yeşillik
- Department of Immunology and Allergy, University of Health Sciences Turkey, Gülhane Education and Research Hospital, 06010, Ankara, Turkey
| | - Ahmet Bolat
- Department of Child Health and Diseases, University of Health Sciences Turkey, Gülhane Education and Research Hospital, 06010, Ankara, Turkey
| | - Özgür Kartal
- Department of Immunology and Allergy, University of Health Sciences Turkey, Gülhane Education and Research Hospital, 06010, Ankara, Turkey
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Distribution of Label-Retaining Cells and their Properties in the Newborn Vocal Fold Mucosa. J Voice 2021:S0892-1997(21)00099-0. [PMID: 33865655 DOI: 10.1016/j.jvoice.2021.03.003] [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: 11/20/2020] [Revised: 02/26/2021] [Accepted: 03/01/2021] [Indexed: 01/05/2023]
Abstract
OBJECTIVES There is growing evidence that the cells in the maculae flavae (MFe) are candidates for tissue stem cells of the vocal fold mucosa and the MFe are a stem cell niche. Distribution of label-retaining cells and their properties in the postnatal vocal fold mucosa were investigated. METHODS Oral administration of bromodeoxyuridine (BrdU) was given to pregnant Sprague-Dawley rats and the label-retaining cells in the postnatal vocal fold mucosa were observed by immunohistochemistry. Immunoreactivity to antibodies directed to Ki-67 was studied to investigate the cell cycle. RESULTS At day 1 after birth, BrdU positive cells were identified in the MFe (60.1 ± 1.7%), epithelium (58.7 ± 10.6%) and lamina propria (52.4 ± 7.8%) of the vocal fold mucosa. At day 56 after birth, the number of BrdU positive cells in the epithelium (4.8 ± 2.2%) and lamina propria (32.3 ± 16.5%) were significantly lower compared to day 1 after birth (P < 0.05). However, the number of BrdU positive cells remaining in the MFe was still high (56.2 ± 2.5%). The label-retaining cells were distributed throughout the MFe. Few Ki-67 positive cells were identified in the MFe indicating they were resting cells. CONCLUSIONS The results of this study are consistent with the hypothesis that the cells in the postnatal MFe are candidates for tissue stem cells. At birth, these cells are already present in the MFe of the newborn vocal fold and they are likely ready to start the growth and development of the vocal fold mucosa.
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Sato K, Umeno H, Nakashima T, Nonaka S, Harabuchi Y. Expression and Distribution of Hyaluronic Acid and CD44 in Unphonated Human Vocal Fold Mucosa. Ann Otol Rhinol Laryngol 2017. [DOI: 10.1177/000348940911801105] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objectives The tension caused by phonation (vocal fold vibration) is hypothesized to stimulate vocal fold stellate cells (VFSCs) in the maculae flavae (MFe) to accelerate production of extracellular matrices. The distribution of hyaluronic acid (HA) and expression of CD44 (a cell surface receptor for HA) were examined in human vocal fold mucosae (VFMe) that had remained unphonated since birth. Methods Five specimens of VFMe (3 adults, 2 children) that had remained unphonated since birth were investigated with Alcian blue staining, hyaluronidase digestion, and immunohistochemistry for CD44. Results The VFMe containing MFe were hypoplastic and rudimentary. The VFMe did not have a vocal ligament, Reinke's space, or a layered structure, and the lamina propria appeared as a uniform structure. In the children, HA was distributed in the VFMe containing MFe. In the adults, HA had decreased in the VFMe containing MFe. In both groups, the VFSCs in the MFe and the fibroblasts in the lamina propria expressed little CD44. Conclusions This study supports the hypothesis that the tensions caused by vocal fold vibration stimulate the VFSCs in the MFe to accelerate production of extracellular matrices and form the layered structure. Phonation after birth is one of the important factors in the growth and development of the human VFMe.
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Affiliation(s)
- Kiminori Sato
- Department of Otolaryngology–Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Hirohito Umeno
- Department of Otolaryngology–Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Tadashi Nakashima
- Department of Otolaryngology–Head and Neck Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Satoshi Nonaka
- Department of Otolaryngology-Head and Neck Surgery, Asahikawa Medical College, Asahikawa, Japan
| | - Yasuaki Harabuchi
- Department of Otolaryngology-Head and Neck Surgery, Asahikawa Medical College, Asahikawa, Japan
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Peng H, Ming L, Yang R, Liu Y, Liang Y, Zhao Y, Jin Y, Deng Z. The use of laryngeal mucosa mesenchymal stem cells for the repair the vocal fold injury. Biomaterials 2013; 34:9026-35. [PMID: 23978518 DOI: 10.1016/j.biomaterials.2013.08.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 08/01/2013] [Indexed: 01/02/2023]
Abstract
Stem cell transplantation is a kind of attractive and new approach that complements traditional restorative or surgical techniques for the regeneration of injured or pathologically damaged laryngeal tissues. However, the best cell delivery strategy remains to be identified. The objective of this study was to establish a new strategy to the healing of injured vocal fold, using laryngeal mucosa mesenchymal stem cells differentiating into myofibroblasts or fibroblasts and improving the reconstruction microenvironment in the vocal fold injury as a new alternative as seed cells for laryngeal tissue engineering. After isolation and expansion, cells were identified as adherent mesenchymal cells with substantial proliferation potential in vitro, and were also characterized by flow cytometry. The differentiation potential of mesenchymal cells was maintained during proliferation as confirmed by culturing for adipogenesis, osteogenesis and chondrocyte. When LM-MSC was transplanted into the injured vocal fold, it has the potent differentiated into myofibroblasts and fibroblasts, which could regulate extracellular matrix, block collagen and the fibronectin rapid increased, inhibit the rapidly decrease of elastic fiber and HA, decrease the microenvironment inflammatory reaction, and prevent the formation of vocal fold scar.
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Affiliation(s)
- Han Peng
- Department of Otolaryngology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, China; Research and Development Center for Tissue Engineering, Fourth Military Medical University, Xi'an, Shaanxi 710032, China
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Gelardi M, Iannuzzi L, Quaranta N. Intranasal sodium hyaluronate on the nasal cytology of patients with allergic and nonallergic rhinitis. Int Forum Allergy Rhinol 2013; 3:807-13. [DOI: 10.1002/alr.21193] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 04/10/2013] [Accepted: 05/16/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Matteo Gelardi
- Section of Otolaryngology; Department of Neuroscience and Sensory Organs, University of Bari; Bari Italy
| | - Lucia Iannuzzi
- Section of Otolaryngology; Department of Neuroscience and Sensory Organs, University of Bari; Bari Italy
| | - Nicola Quaranta
- Section of Otolaryngology; Department of Neuroscience and Sensory Organs, University of Bari; Bari Italy
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Li NY, Heris HK, Mongeau L. Current Understanding and Future Directions for Vocal Fold Mechanobiology. JOURNAL OF CYTOLOGY & MOLECULAR BIOLOGY 2013; 1:001. [PMID: 24812638 PMCID: PMC4011392 DOI: 10.13188/2325-4653.1000001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The vocal folds, which are located in the larynx, are the main organ of voice production for human communication. The vocal folds are under continuous biomechanical stress similar to other mechanically active organs, such as the heart, lungs, tendons and muscles. During speech and singing, the vocal folds oscillate at frequencies ranging from 20 Hz to 3 kHz with amplitudes of a few millimeters. The biomechanical stress associated with accumulated phonation is believed to alter vocal fold cell activity and tissue structure in many ways. Excessive phonatory stress can damage tissue structure and induce a cell-mediated inflammatory response, resulting in a pathological vocal fold lesion. On the other hand, phonatory stress is one major factor in the maturation of the vocal folds into a specialized tri-layer structure. One specific form of vocal fold oscillation, which involves low impact and large amplitude excursion, is prescribed therapeutically for patients with mild vocal fold injuries. Although biomechanical forces affect vocal fold physiology and pathology, there is little understanding of how mechanical forces regulate these processes at the cellular and molecular level. Research into vocal fold mechanobiology has burgeoned over the past several years. Vocal fold bioreactors are being developed in several laboratories to provide a biomimic environment that allows the systematic manipulation of physical and biological factors on the cells of interest in vitro. Computer models have been used to simulate the integrated response of cells and proteins as a function of phonation stress. The purpose of this paper is to review current research on the mechanobiology of the vocal folds as it relates to growth, pathogenesis and treatment as well as to propose specific research directions that will advance our understanding of this subject.
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Affiliation(s)
- Nicole Y.K. Li
- Department of Hearing and Speech Sciences, University of Maryland-College Park, College Park, Maryland, United States of America
| | - Hossein K. Heris
- Department of Mechanical Engineering, McGill University, Montreal, Canada
| | - Luc Mongeau
- Department of Mechanical Engineering, McGill University, Montreal, Canada
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Svensson B, Nagubothu SR, Cedervall J, Chan RW, Le Blanc K, Kimura M, Ährlund-Richter L, Tolf A, Hertegård S. Injection of human mesenchymal stem cells improves healing of vocal folds after scar excision--a xenograft analysis. Laryngoscope 2011; 121:2185-90. [PMID: 21898432 DOI: 10.1002/lary.22143] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 05/04/2011] [Indexed: 01/09/2023]
Abstract
OBJECTIVES Using a xenograft model the aim was to analyze if injection of human mesenchymal stem cells (hMSC) into the rabbit vocal fold (VF), after excision of an established scar, can improve the functional healing of the VF. STUDY DESIGN Prospective design with an experimental xenograft model. METHODS The VFs of 12 New Zealand rabbits were injured by a bilateral localized resection. After 9 weeks the scar after the resection was excised and hMSC were injected into the VFs. After another 10 weeks 10 VFs were dissected and stained for histology. Lamina propria thickness and relative content of collagen type I were measured. Viscoelasticity of 14 VFs at phonatory frequencies was quantified by a simple-shear rheometer. The hMSC survival was determined using a human DNA specific reference probe, that is, FISH analysis. RESULTS The viscoelastic measurements, that is, dynamic viscosity and elastic shear modulus for the hMSC-treated VFs, were found to be similar to those of normal controls and were significantly lower than those of untreated controls (P < .05). A significant reduction in lamina propria thickness was also shown for the hMSC treated VFs compared with the untreated VFs (P < .05). This histologic finding corresponded with the viscoelastic results. No hMSC survived 10 weeks after the injection. CONCLUSIONS Human mesenchymal stem cells injected into the rabbit VF following the excision of a chronic scar, were found to enhance the functional healing of the VF with reduced lamina propria thickness and restored viscoelastic shear properties.
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Affiliation(s)
- Bengt Svensson
- Department of Otorhinolaryngology, Östersund Hospital, Östersund, Sweden, and Karolinska Institutet, Stockholm, Sweden.
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Sato K, Umeno H, Nakashima T, Nonaka S, Harabuchi Y. Expression and Distribution of Hyaluronic Acid and CD44 in Unphonated Human Vocal Fold Mucosa. Ann Otol Rhinol Laryngol 2010. [DOI: 10.1177/000348941011901105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objectives: The tension caused by phonation (vocal fold vibration) is hypothesized to stimulate vocal fold stellate cells (VFSCs) in the maculae flavae (MFe) to accelerate production of extracellular matrices. The distribution of hyaluronic acid (HA) and expression of CD44 (a cell surface receptor for HA) were examined in human vocal fold mucosae (VFMe) that had remained unphonated since birth. Methods: Five specimens of VFMe (3 adults, 2 children) that had remained unphonated since birth were investigated with Alcian blue staining, hyaluronidase digestion, and immunohistochemistry for CD44. Results: The VFMe containing MFe were hypoplastic and rudimentary. The VFMe did not have a vocal ligament, Reinke's space, or a layered structure, and the lamina propria appeared as a uniform structure. In the children, HA was distributed in the VFMe containing MFe. In the adults, HA had decreased in the VFMe containing MFe. In both groups, the VFSCs in the MFe and the fibroblasts in the lamina propria expressed little CD44. Conclusions: This study supports the hypothesis that the tensions caused by vocal fold vibration stimulate the VFSCs in the MFe to accelerate production of extracellular matrices and form the layered structure. Phonation after birth is one of the important factors in the growth and development of the human VFMe.
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Svensson B, Nagubothu RS, Cedervall J, Le Blanc K, Ahrlund-Richter L, Tolf A, Hertegård S. Injection of human mesenchymal stem cells improves healing of scarred vocal folds: analysis using a xenograft model. Laryngoscope 2010; 120:1370-5. [PMID: 20568271 DOI: 10.1002/lary.20926] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OBJECTIVES/HYPOTHESIS The aims were to analyze if improved histological and viscoelastic properties seen after injection of human mesenchymal stem cells (hMSCs) in scarred vocal folds (VFs) of rabbits are sustainable and if the injected hMSCs survive 3 months in the VFs. STUDY DESIGN Experimental xenograft model. METHODS Eighteen VFs of 11 New Zealand white rabbits were scarred by a bilateral localized resection. After 3 months the animals were sacrificed. Twelve VFs were dissected and stained for histology, lamina propria thickness, and relative collagen type I analyses. The hMSCs survival was analyzed using a human DNA-specific reference probe, that is, fluorescence in situ hybridization staining. Viscoelasticity, measured as the dynamic viscosity and elastic modulus, was analyzed in a parallel-plate rheometer for 10 VFs. RESULTS The dynamic viscosity and elastic modulus of hMSC-treated VFs were similar to that of normal controls and significantly improved compared to untreated controls (P < .05). A reduction in lamina propria thickness and relative collagen type 1 content were also shown for the hMSC-treated VFs compared to the untreated VFs (P < .05). The histological pictures corresponded well to the viscoelastic results. No hMSCs survived. CONCLUSIONS Human mesenchymal stem cells injected into a scarred vocal fold of rabbit enhance healing of the vocal fold with reduced lamina propria thickness and collagen type I content and restore the viscoelastic function.
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Affiliation(s)
- Bengt Svensson
- Department of Otorhinolaryngology, Ostersund Hospital, Ostersund, Sweden.
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Sato K, Nakashima T. Stellate cells in the human child vocal fold macula flava. Laryngoscope 2009; 119:203-10. [DOI: 10.1002/lary.20010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Does Hyaluronic Acid Distribution in the Larynx Relate to the Newbornʼs Capacity for Crying? Laryngoscope 2008; 118:1692-9. [DOI: 10.1097/mlg.0b013e3181782754] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Sato K, Shirouzu H, Nakashima T. Irradiated macula flava in the human vocal fold mucosa. Am J Otolaryngol 2008; 29:312-8. [PMID: 18722887 DOI: 10.1016/j.amjoto.2007.09.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2007] [Revised: 08/27/2007] [Accepted: 09/03/2007] [Indexed: 10/21/2022]
Abstract
PURPOSE There have been no investigations regarding radiation-induced damage on human maculae flavae (MFs) in the vocal fold mucosa (VFM) and on stellate cells (SC) in the MF. The VFM, especially MF, after irradiation was investigated histologically. MATERIALS AND METHODS The lamina propria of the irradiated VFM was investigated in 5 human adult vocal folds by light and electron microscopy. RESULTS Fibroblasts in the irradiated Reinke's space (RS) showed no morphological changes. Irradiated RS was composed of fibrous tissue with increased collagenous fibers. Most of the SC in the irradiated MF had dark cytoplasm. The nucleus-cytoplasm ratio was relatively small, but there were few intracellular organelles in the cytoplasm. Some SC showed degeneration. Fewer vesicles were present at the periphery of the cytoplasm. The MF was rather deficient in fibrous components. Elastic and collagenous fibers immediately surrounding SC in the irradiated MF were lower in number than usual, but elastic fibers and collagenous fibers composed of irregular collagen fibrils could be detected at a distance from SC. It was suggested that precursors of collagenous and elastic fibers synthesized by SC were damaged by irradiation. Radiation sensitivity of SC was higher than that of conventional fibroblasts in RS, and SC appeared to decrease their level of activity. CONCLUSIONS Radiation sensitivity of SC was different from that of conventional fibroblasts. Radiation induced not only changes in the lamina propria of the VFM but also dysfunction of the SC in the MF, and is one of the causes of voice disorders after irradiation.
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Sato K, Nakashima T, Nonaka S, Harabuchi Y. Histopathologic investigations of the unphonated human vocal fold mucosa. Acta Otolaryngol 2008; 128:694-701. [PMID: 18568507 DOI: 10.1080/00016480701675643] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
CONCLUSION Vocal fold vibration (phonation) after birth is one of the important factors in the growth and development of the human vocal fold mucosa. OBJECTIVES Stellate cells in the maculae flavae located at both ends of the vocal fold mucosa are inferred to be involved in the metabolism of extracellular matrices. Maculae flavae are also considered to be an important structure in the growth and development of the human vocal fold mucosa. Tension caused by phonation (vocal fold vibration) is hypothesized to stimulate stellate cells to accelerate production of extracellular matrices. Vocal fold mucosae unphonated since birth were investigated histologically. SUBJECTS AND METHODS Vocal fold mucosae, which were unphonated since birth, of three younger adults (17, 24, 28 years old) were investigated by light and electron microscopy. RESULTS Vocal fold mucosae were hypoplastic and rudimentary and did not have a vocal ligament, Reinke's space or a layered structure. The lamina propria appeared as a uniform structure. Some stellate cells in the maculae flavae showed degeneration. Not many vesicles were present at the periphery of the cytoplasm. The stellate cells synthesized fewer extracellular matrices, such as fibrous protein and glycosaminoglycan. Cytoplasmic processes of the stellate cells were short and shrinking. The stellate cells appeared to have decreased activity.
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Abstract
AbstractObjectives:Stellate cells in the maculae flavae, located at both ends of the human vocal fold mucosa, have been considered an independent category of cells. We aimed to isolate and subculture these stellate cells, and to observe their morphological characteristics.Methods:Stellate cells from the maculae flavae and fibroblasts from Reinke's space were cultured in three normal, adult human vocal fold mucosa preparations.Results:The subcultured cells from Reinke's space were conventional fibroblasts. The subcultured cells from the maculae flavae were stellate in shape and had cytoplasmic processes. They were larger than conventional fibroblasts, and lipid droplets in the cytoplasm disappeared in the second culture. These stellate cells proliferated by attaching their cytoplasmic processes to each other. During the seven to 10 month subculture period, each cell type continued to exhibit its own morphological characteristics.Conclusion:This study demonstrated that such stellate cells form an independent cell category, which should be considered as a new category of cells within the human vocal fold.
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Bibliography. Current world literature. Laryngology and bronchoesophagology. Curr Opin Otolaryngol Head Neck Surg 2007; 15:417-24. [PMID: 17986882 DOI: 10.1097/moo.0b013e3282f3532f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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