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Nativ-Zeltzer N, Kuhn MA, Evangelista L, Anderson JD, Nolta JA, Farwell DG, Canestrari E, Jankowski RJ, Belafsky PC. Autologous Muscle-Derived Cell Therapy for Swallowing Impairment in Patients Following Treatment for Head and Neck Cancer. Laryngoscope 2022; 132:523-527. [PMID: 33988246 PMCID: PMC8909914 DOI: 10.1002/lary.29606] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 04/08/2021] [Accepted: 04/19/2021] [Indexed: 01/07/2023]
Abstract
OBJECTIVES/HYPOTHESIS To evaluate the safety and potential efficacy of autologous muscle-derived cells (AMDCs) for the treatment of swallowing impairment following treatment for oropharynx cancer. STUDY DESIGN Prospective, phase I, open label, clinical trial. METHODS Oropharynx cancer survivors disease free ≥2 years post chemoradiation were recruited. All patients had swallowing impairment but were not feeding tube dependent (Functional Oral Intake Scale [FOIS] ≥ 5). Muscle tissue (50-250 mg) was harvested from the vastus lateralis and 150 × 106 AMDCs were prepared (Cook MyoSite Inc., Pittsburgh, PA). The cells were injected into four sites throughout the intrinsic tongue musculature. Participants were followed for 24 months. The primary outcome measure was safety. Secondary endpoints included objective measures on swallowing fluoroscopy, oral and pharyngeal pressure, and changes in patient-reported outcomes. RESULTS Ten individuals were enrolled. 100% (10/10) were male. The mean age of the cohort was 65 (±8.87) years. No serious adverse event occurred. Mean tongue pressure increased significantly from 26.3 (±11.1) to 31.8 (±9.5) kPa (P = .017). The mean penetration-aspiration scale did not significantly change from 5.6 (±2.1) to 6.8 (±1.8), and the mean FOIS did not significantly change from 5.4 (±0.5) to 4.6 (±0.7). The incidence of pneumonia was 30% (3/10) and only 10% (1/10) experienced deterioration in swallowing function throughout 2 years of follow-up. The mean eating assessment tool (EAT-10) did not significantly change from 24.1 (±5.57) to 21.3 (±6.3) (P = .12). CONCLUSION Results of this phase I clinical trial demonstrate that injection of 150 × 106 AMDCs into the tongue is safe and may improve tongue strength, which is durable at 2 years. A blinded placebo-controlled trial is warranted. LEVEL OF EVIDENCE 3 Laryngoscope, 132:523-527, 2022.
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Affiliation(s)
- Nogah Nativ-Zeltzer
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis Medical Center, Sacramento, California, U.S.A
| | - Maggie A Kuhn
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis Medical Center, Sacramento, California, U.S.A
| | - Lisa Evangelista
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis Medical Center, Sacramento, California, U.S.A
| | - Johnathon D Anderson
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis Medical Center, Sacramento, California, U.S.A
| | - Jan A Nolta
- Institute for Regenerative Cures, Department of Internal Medicine, University of California, Davis, Sacramento, California, U.S.A
| | - D Gregory Farwell
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis Medical Center, Sacramento, California, U.S.A
| | | | | | - Peter C Belafsky
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis Medical Center, Sacramento, California, U.S.A
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Goto A, Kokabu S, Dusadeemeelap C, Kawaue H, Matsubara T, Tominaga K, Addison WN. Tongue Muscle for the Analysis of Head Muscle Regeneration Dynamics. J Dent Res 2022; 101:962-971. [PMID: 35193429 DOI: 10.1177/00220345221075966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Tongue muscle damage impairs speaking and eating, thereby degrading overall health and quality of life. Skeletal muscles of the body are diverse in embryonic origin, anatomic location, and gene expression profiles. Responses to disease, atrophy, aging, or drugs vary among different muscles. Currently, most muscle studies are focused on limb muscles and the tongue is neglected. The regenerative ability of tongue muscle remains unknown, and thus there is need for tongue muscle research models. Here, we present a comprehensive characterization of the spatiotemporal dynamics in a mouse model of tongue muscle regeneration and establish a method for the isolation of primary tongue-derived satellite cells. We compare and contrast our observations with the tibialis anterior (TA) limb muscle. Acute injury was induced by intramuscular injection of cardiotoxin, a cytolytic agent, and examined at multiple timepoints. Initially, necrotic myofibers with fragmented sarcoplasm became infiltrated with inflammatory cells. Concomitantly, satellite cells expanded rapidly. Seven days postinjury, regenerated myofibers with centralized nuclei appeared. Full regeneration, as well as an absence of fibrosis, was evident 21 d postinjury. Primary tongue-derived satellite cells were isolated by enzymatic separation of tongue epithelium from mesenchyme followed by magnetic-activated cell sorting. We observed that tongue displays an efficient regenerative response similar to TA but with slightly faster kinetics. In vitro, tongue-derived satellite cells differentiated robustly into mature myotubes with spontaneous contractile behavior and myogenic marker expression. Comparison of gene expression signatures between tongue and TA-derived satellite cells revealed differences in the expression of positional-identity genes, including the HOX family. In conclusion, we have established a model for tongue regeneration useful for investigations of orofacial muscle biology. Furthermore, we showed that tongue is a viable source of satellite cells with unique properties and inherited positional memory.
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Affiliation(s)
- A Goto
- Division of Molecular Signaling and Biochemistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.,Division of Oral and Maxillofacial Surgery, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - S Kokabu
- Division of Molecular Signaling and Biochemistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - C Dusadeemeelap
- Division of Molecular Signaling and Biochemistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - H Kawaue
- Division of Molecular Signaling and Biochemistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - T Matsubara
- Division of Molecular Signaling and Biochemistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - K Tominaga
- Division of Oral and Maxillofacial Surgery, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
| | - W N Addison
- Division of Molecular Signaling and Biochemistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan
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MacDonald A, Gross A, Jones B, Dhar M. Muscle Regeneration of the Tongue: A review of current clinical and regenerative research strategies. TISSUE ENGINEERING PART B-REVIEWS 2021; 28:1022-1034. [PMID: 34693743 DOI: 10.1089/ten.teb.2021.0133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Various abnormalities of the tongue, including cancers, commonly require surgical removal to sequester growth and metastasis. However, even minor resections can affect functional outcomes such as speech and swallowing, thereby reducing quality of life. Surgical resections alone create volumetric muscle loss whereby muscle tissue cannot self-regenerate within the tongue. In these cases, the tongue is reconstructed typically in the form of autologous skin flaps. However, flap reconstruction has many limitations and unfortunately is the primary option for oral and reconstructive surgeons to treat tongue defects. The alternative, but yet undeveloped strategy for tongue reconstruction is regenerative medicine, which widely focuses on building new organs with stem cells. Regenerative medicine has successfully treated many tissues, but research has inadequately addressed the tongue as a vital organ in need of tissue engineering. In this review, we address the current standard for tongue reconstruction, the cellular mechanisms of muscle cell development, and the stem cell studies that have attempted muscle engineering within the tongue. Until now, no review has focused on engineering the tongue with regenerative medicine, which could guide innovative strategies for tongue reconstruction.
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Affiliation(s)
- Amber MacDonald
- The University of Tennessee Knoxville College of Veterinary Medicine, 70737, Large Animal Clinical Sciences, 2407 River Drive, Knoxville, Tennessee, United States, 37996-4539;
| | - Andrew Gross
- The University of Tennessee Medical Center, 21823, Knoxville, Tennessee, United States;
| | - Brady Jones
- The University of Tennessee Medical Center, 21823, Knoxville, Tennessee, United States;
| | - Madhu Dhar
- University of Tennessee Knoxville College of Veterinary Medicine, 70737, Large Animal Clinical Sciences, College of Veterinary Medicine, 2407 River Drive, Knoxville, Tennessee, United States, 37996.,University of Tennessee;
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Regenerative medicine for end-stage fibrosis and tissue loss in the upper aerodigestive tract: a twenty-first century review. The Journal of Laryngology & Otology 2021; 135:473-485. [PMID: 33988100 DOI: 10.1017/s002221512100092x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE This review assesses regenerative medicine of the upper aerodigestive tract during the first two decades of the twenty-first century, focusing on end-stage fibrosis and tissue loss in the upper airways, salivary system, oropharynx and tongue. METHOD PubMed, Embase, Google Scholar, Cochrane Library, Medline and clinicaltrials.org were searched from 2000 to 2019. The keywords used were: bioengineering, regenerative medicine, tissue engineering, cell therapy, regenerative surgery, upper aerodigestive tract, pharynx, oropharynx, larynx, trachea, vocal cord, tongue and salivary glands. Original studies were subcategorised by anatomical region. Original human reports were further analysed. Articles on periodontology, ear, nose and maxillofacial disorders, and cancer immunotherapy were excluded. RESULTS Of 716 relevant publications, 471 were original studies. There were 18 human studies included, within which 8 reported airway replacements, 5 concerned vocal fold regeneration and 3 concerned salivary gland regeneration. Techniques included cell transplantation, injection of biofactors, bioscaffolding and bioengineered laryngeal structures. CONCLUSION Moderate experimental success was identified in the restoration of upper airway, vocal fold and salivary gland function. This review suggests that a shift in regenerative medicine research focus is required toward pathology with a higher disease burden.
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Camacho-Alonso F, García-Carrillo N, Buendía AJ, Navarro JA, Peñarrocha-Oltra D, Peñarrocha-Diago M, Lacal-Luján J. Regeneration of lingual musculature in rats using myoblasts over porcine bladder acellular matrix. Oral Dis 2020; 27:1580-1589. [PMID: 33031620 DOI: 10.1111/odi.13674] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 09/02/2020] [Accepted: 10/01/2020] [Indexed: 01/19/2023]
Abstract
OBJECTIVES To use tissue engineering muscle repair (TEMR) for regenerating the lingual musculature of hemiglossectomized rats using neonatal myoblasts (NM) on porcine acellular urinary bladder matrix (AUBM). MATERIAL AND METHODS The study used 80 male rats. A volumetric muscle loss (VML) injury was created on the left side of the tongue. The rats were randomized into four groups: Group 1 (AUBM + myoblasts); Group 2 (AUBM); Group 3 (myoblasts); and Group 4 (control). NM were obtained from neonatal rats. The animals were weighed on day 0 and just before euthanasia. Five rats in each group were euthanized at days 2, 14, 28, and 42; the tongues were prepared for morphometric analysis, postoperative left hemitongue weight, and immunohistochemical analysis (desmin, CD-31, and anti-neurofilament). RESULTS The weight gain from greatest to least was as follows: AUBM + myoblasts > myoblasts > AUBM > control. The tongue dorsum occupied by VML, and difference in mg between control side and intervened side from least to great was as follows: AUBM + myoblasts < myoblasts < AUBM < control. The order from highest to lowest antibody positivity was as follows: AUBM + myoblasts > myoblasts > AUBM > control. CONCLUSION The use of porcine AUBM and NM for the regeneration of lingual musculature was found to be an effective TEMR treatment for repairing tongue VML injury.
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Affiliation(s)
| | | | | | - Jose Antonio Navarro
- Department of Histology and Pathology Anatomy, University of Murcia, Murcia, Spain
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Tran EK, Juarez KO, Long JL. Stem cell treatments for oropharyngeal dysphagia: Rationale, benefits, and challenges. World J Stem Cells 2020; 12:1001-1012. [PMID: 33033560 PMCID: PMC7524699 DOI: 10.4252/wjsc.v12.i9.1001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 07/28/2020] [Accepted: 09/01/2020] [Indexed: 02/06/2023] Open
Abstract
Dysphagia, defined as difficulty swallowing, is a common symptom negatively impacting millions of adults annually. Estimated prevalence ranges from 14 to 33 percent in those over age 65 to over 70 percent in a nursing home setting. The elderly, those with neurodegenerative diseases, head and neck cancer patients, and those with autoimmune conditions such as Sjögren's syndrome are disproportionately affected. Oropharyngeal dysphagia refers specifically to difficulty in initiating a swallow due to dysfunction at or above the upper esophageal sphincter, and represents a large proportion of dysphagia cases. Current treatments are limited and are often ineffective. Stem cell therapy is a new and novel advancement that may fill a much-needed role in our treatment regimen. Here, we review the current literature regarding stem cell treatments for oropharyngeal dysphagia. Topics discussed include tissue regeneration advancements as a whole and translation of these principles into research surrounding tongue dysfunction, xerostomia, cricopharyngeal dysfunction, and finally an overview of the challenges and future directions for investigation. Although this field of study remains in its early stages, initial promising results show potential for the use of stem cell-based therapies to treat oropharyngeal dysphagia and warrant further research.
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Affiliation(s)
- Eric K Tran
- David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA 90095, United States
| | - Kevin O Juarez
- Department of Otolaryngology, Yale School of Medicine, New Haven, CT 06511, United States
| | - Jennifer L Long
- Department of Head and Neck Surgery, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA 90095, United States
- Greater Los Angeles VA Healthcare System, Los Angeles, CA 90073, United States
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Tahim A, Sadiq Z. Using decalcified collagen scaffolds to improve healing after transoral partial glossectomy for squamous cell carcinoma. J Oral Pathol Med 2019; 49:39-42. [DOI: 10.1111/jop.12957] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 08/21/2019] [Accepted: 08/27/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Arpan Tahim
- Department of Head and Neck Surgery University College London Hospital London UK
| | - Zaid Sadiq
- Department of Head and Neck Surgery University College London Hospital London UK
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Vahabzadeh-Hagh AM, Goel AN, Frederick JW, Berke GS, Long JL. Transplanted human multipotent stromal cells reduce acute tongue fibrosis in rats. Laryngoscope Investig Otolaryngol 2018; 3:450-456. [PMID: 30599029 PMCID: PMC6302725 DOI: 10.1002/lio2.202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2018] [Indexed: 12/25/2022] Open
Abstract
Background Tongue fibrosis resulting from head and neck cancer, surgery, radiation, chemotherapy, or a combination thereof devastates one's quality of life. Therapeutic options are limited. Here we investigate human bone marrow-derived multipotent stromal cells (MSC) as a novel injectable treatment for post-injury tongue fibrosis. Methods MSCs were grown in culture. Eighteen athymic rats underwent unilateral partial glossectomy. After two weeks for scar formation, a single injection was performed in the tongue scar. Three treatment groups were studied: low and high concentration MSC, and control media injection. Tongues were harvested for evaluation at three weeks post-treatment. Results Dense fibrosis was achieved in control animals at five weeks. High concentration MSC reduced cross sectional scar burden (P = .007) and pathologic score for inflammation and fibrosis. Conclusion This study establishes the feasibility of a novel rodent tongue fibrosis model, and begins to assess the utility of human MSCs to reduce scar burden. Level of Evidence N/a.
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Affiliation(s)
| | - Alexander N Goel
- From the Department of Head and Neck Surgery, UCLA David Geffen School of Medicine Los Angeles California U.S.A
| | - John W Frederick
- From the Department of Head and Neck Surgery, UCLA David Geffen School of Medicine Los Angeles California U.S.A
| | - Gerald S Berke
- From the Department of Head and Neck Surgery, UCLA David Geffen School of Medicine Los Angeles California U.S.A
| | - Jennifer L Long
- From the Department of Head and Neck Surgery, UCLA David Geffen School of Medicine Los Angeles California U.S.A.,Research Service Greater Los Angeles VA Healthcare System Los Angeles California U.S.A
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Stem Cells in Dentistry: Types of Intra- and Extraoral Tissue-Derived Stem Cells and Clinical Applications. Stem Cells Int 2018; 2018:4313610. [PMID: 30057624 PMCID: PMC6051054 DOI: 10.1155/2018/4313610] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 04/05/2018] [Accepted: 06/07/2018] [Indexed: 12/13/2022] Open
Abstract
Stem cells are undifferentiated cells, capable of renewing themselves, with the capacity to produce different cell types to regenerate missing tissues and treat diseases. Oral facial tissues have been identified as a source and therapeutic target for stem cells with clinical interest in dentistry. This narrative review report targets on the several extraoral- and intraoral-derived stem cells that can be applied in dentistry. In addition, stem cell origins are suggested in what concerns their ability to differentiate as well as their particular distinguishing quality of convenience and immunomodulatory for regenerative dentistry. The development of bioengineered teeth to replace the patient's missing teeth was also possible because of stem cell technologies. This review will also focus our attention on the clinical application of stem cells in dentistry. In recent years, a variety of articles reported the advantages of stem cell-based procedures in regenerative treatments. The regeneration of lost oral tissue is the target of stem cell research. Owing to the fact that bone imperfections that ensue after tooth loss can result in further bone loss which limit the success of dental implants and prosthodontic therapies, the rehabilitation of alveolar ridge height is prosthodontists' principal interest. The development of bioengineered teeth to replace the patient's missing teeth was also possible because of stem cell technologies. In addition, a “dental stem cell banking” is available for regenerative treatments in the future. The main features of stem cells in the future of dentistry should be understood by clinicians.
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Kuhn MA, Black AB, Siddiqui MT, Nolta JA, Belafsky PC. Novel murine xenograft model for the evaluation of stem cell therapy for profound dysphagia. Laryngoscope 2017; 127:E359-E363. [PMID: 28543406 DOI: 10.1002/lary.26666] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 02/26/2017] [Accepted: 04/10/2017] [Indexed: 01/01/2023]
Abstract
OBJECTIVES/HYPOTHESIS Dysphagia is common and costly. Treatments are limited and innovative therapies are required. The tongue is essential for safe, effective swallowing and is a natural target for regenerative therapy. Muscle-derived stem cells (MDSCs) hold potential to restore dynamic function, and their application in the damaged tongue is appealing. We examined the safety and efficacy of human MDSC implantation into a novel mouse tongue model. STUDY DESIGN Animal study. METHODS Adult immune-deficient mice were randomized to surgical (hemiglossectomy) and nonsurgical groups. Animals underwent lingual injection of human MDSCs or saline (control). Groups were followed for 12 weeks. The primary outcome was MDSC survival measured by an in vivo imaging system (IVIS). Secondary outcomes included animal survival and weight. Comparisons were made using a Mann-Whitney U test with an α of .05. RESULTS Human MDSCs survived to the endpoint demonstrating 132% ± 465% and 15% ± 11% bioluminescence by IVIS at 12 weeks in hemiglossectomy and nonsurgical groups, respectively. All but one animal (hemiglossectomy with saline injection) survived to the study endpoint. Mean weight increased from baseline in all groups, with the greatest change observed in hemiglossectomy mice with MDSC injection (baseline 24.5 g ± 3.9 g; delta 5.9 g ± 4.6 g), exceeding the weight gain seen in surgical control mice (baseline 24.9 g ± 4.2 g, delta 2.7 g ± 1.4 g) (P = .04). CONCLUSIONS MDSCs exhibited over 100% survival at 3 months when injected into an immune-deficient hemiglossectomy mouse model. Tongue-injured animals injected with MDSCs exhibited superior weight gain after hemiglossectomy than control animals (P < .05). These data support further investigation into the use of autologous MDSCs as a potential treatment for dysphagia secondary to tongue weakness and fibrosis LEVEL OF EVIDENCE: NA Laryngoscope, 127:E359-E363, 2017.
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Affiliation(s)
- Maggie A Kuhn
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis, Davis, California, U.S.A
| | - Amanda B Black
- Department of Internal Medicine, Institute for Regenerative Cures, University of California, Davis, Davis, California, U.S.A
| | - M Tausif Siddiqui
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis, Davis, California, U.S.A
| | - Jan A Nolta
- Department of Internal Medicine, Institute for Regenerative Cures, University of California, Davis, Davis, California, U.S.A
| | - Peter C Belafsky
- Department of Otolaryngology-Head and Neck Surgery, University of California, Davis, Davis, California, U.S.A
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Plowman EK, Bijangi-Vishehsaraei K, Halum S, Cates D, Hanenberg H, Domer AS, Nolta JA, Belafsky PC. Autologous myoblasts attenuate atrophy and improve tongue force in a denervated tongue model: a pilot study. Laryngoscope 2013; 124:E20-6. [PMID: 23929623 DOI: 10.1002/lary.24352] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 07/08/2013] [Accepted: 07/18/2013] [Indexed: 01/10/2023]
Abstract
OBJECTIVES/HYPOTHESIS Autologous muscle-derived stem cell (MdSC) therapy is a promising treatment to restore function. No group has evaluated MdSC therapy in a denervated tongue model. The purpose of this pilot investigation was to determine the extent of autologous MdSC survival, effects on tongue muscle atrophy, maximal contractile force, and lingual pressure in a denervated ovine tongue model. STUDY DESIGN Pilot animal experiment. METHODS Bilateral implantable cuff electrodes were placed around the hypoglossal nerves in two Dorper cross ewes. Tensometer and high-resolution manometry (HRM) testing were performed during supermaximum hypoglossal nerve stimulation to assess baseline tongue strength. Sternocleidomastoid muscle biopsies were acquired to create autologous MdSC cultures. At 1 month, 5 × 10(8) green fluorescent protein (GFP)-labeled autologous MdSCs were injected into the partially denervated tongue. Two-months postinjection, lingual tensometer testing, HRM, and postmortem histological assessment were performed. RESULTS GFP+ myofibers were identified in denervated tongue specimens indicating MdSC survival. Muscle fiber diameter was larger in GFP+ fibers for both tongue specimens, suggesting attenuation of muscle atrophy. Myofiber diameter was larger in GFP+ myofibers than preinjury diameters, providing evidence of new muscle formation. These myogenic changes led to a 27% increase in maximal tongue contractile force and a 54% increase in maximum base of tongue pressure in one animal. CONCLUSIONS Autologous MdSC therapy may be a viable treatment for the partially denervated tongue, with current findings demonstrating that injected MdSCs survived and fused with tongue myofibers, with a resultant increase in myofiber diameter and an increase in tongue strength. LEVEL OF EVIDENCE N/A.
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Affiliation(s)
- Emily K Plowman
- Department of Communication Sciences and Disorders, University of South Florida, Tampa, Florida
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Stem cells in dentistry--Part II: Clinical applications. J Prosthodont Res 2012; 56:229-48. [PMID: 23137671 DOI: 10.1016/j.jpor.2012.10.001] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Accepted: 10/03/2012] [Indexed: 12/29/2022]
Abstract
New technologies that facilitate solid alveolar ridge augmentation are receiving considerable attention in the field of prosthodontics because of the growing requirement for esthetic and functional reconstruction by dental implant treatments. Recently, several studies have demonstrated potential advantages for stem-cell-based therapies in regenerative treatments. Mesenchymal stem/stromal cells (MSCs) are now an excellent candidate for tissue replacement therapies, and tissue engineering approaches and chair-side cellular grafting approaches using autologous MSCs represent the clinical state of the art for stem-cell-based alveolar bone regeneration. Basic studies have revealed that crosstalk between implanted donor cells and recipient immune cells plays a key role in determining clinical success that may involve the recently observed immunomodulatory properties of MSCs. Part II of this review first overviews progress in regenerative dentistry to consider the implications of the stem cell technology in dentistry and then highlights cutting-edge stem-cell-based alveolar bone regenerative therapies. Factors that affect stem-cell-based bone regeneration as related to the local immune response are then discussed. Additionally, pre-clinical stem cell studies for the regeneration of teeth and other oral organs as well as possible applications of MSC-based immunotherapy in dentistry are outlined. Finally, the marketing of stem cell technology in dental stem cell banks with a view toward future regenerative therapies is introduced.
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Egusa H, Sonoyama W, Nishimura M, Atsuta I, Akiyama K. Stem cells in dentistry--part I: stem cell sources. J Prosthodont Res 2012; 56:151-65. [PMID: 22796367 DOI: 10.1016/j.jpor.2012.06.001] [Citation(s) in RCA: 213] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 06/14/2012] [Indexed: 12/21/2022]
Abstract
Stem cells can self-renew and produce different cell types, thus providing new strategies to regenerate missing tissues and treat diseases. In the field of dentistry, adult mesenchymal stem/stromal cells (MSCs) have been identified in several oral and maxillofacial tissues, which suggests that the oral tissues are a rich source of stem cells, and oral stem and mucosal cells are expected to provide an ideal source for genetically reprogrammed cells such as induced pluripotent stem (iPS) cells. Furthermore, oral tissues are expected to be not only a source but also a therapeutic target for stem cells, as stem cell and tissue engineering therapies in dentistry continue to attract increasing clinical interest. Part I of this review outlines various types of intra- and extra-oral tissue-derived stem cells with regard to clinical availability and applications in dentistry. Additionally, appropriate sources of stem cells for regenerative dentistry are discussed with regard to differentiation capacity, accessibility and possible immunomodulatory properties.
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Affiliation(s)
- Hiroshi Egusa
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
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Zhang W, Walboomers XF, Van Kuppevelt TH, Daamen WF, Van Damme PA, Bian Z, Jansen JA. In vivo evaluation of human dental pulp stem cells differentiated towards multiple lineages. J Tissue Eng Regen Med 2008; 2:117-25. [DOI: 10.1002/term.71] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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