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Boot M, Winters R. Managing massive palatial defect secondary to palatoplasty failures: an in-depth analysis. Curr Opin Otolaryngol Head Neck Surg 2024; 32:269-277. [PMID: 38393699 DOI: 10.1097/moo.0000000000000968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2024]
Abstract
PURPOSE OF REVIEW Massive palatal defects resulting from palatoplasty failures arising from cleft palate repair complications present ongoing challenges in clinical practice. The purpose of this review is to provide up-to-date insights into aetiology, risk factors, surgical techniques, and adjunctive therapies, aiming to enhance the understanding of such complex cases, and optimize patient outcomes. RECENT FINDINGS Primary palatoplasty has fistula recurrence rates ranging from 2.4% to 55%. Factors such as cleft width, surgical repair method, and patient characteristics, influence the likelihood of failure. Classifications such as the Pakistan Comprehensive Classification and Richardson's criteria aid in assessing defects. Surgical options range from local flaps and revision palatoplasty to regional flaps (e.g., buccinator myomucosal, facial artery-based flaps, tongue flaps, nasal septal flaps) to free microvascular flaps. Alternative approaches include obturator prostheses, and acellular dermal matrix has been used as an adjuvant to multiple repair techniques. Hyperbaric oxygen therapy has emerged as an adjunctive therapy to enhance tissue healing. SUMMARY This comprehensive review underscores the intricate challenges associated with massive palatal defects resulting from palatoplasty failures. The diverse range of surgical and nonsurgical options emphasizes the importance of patient-centric, individualized approaches. Practitioners, armed with evidence-based insights, can navigate these complexities, offering tailored interventions for improved patient outcomes.
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Affiliation(s)
- Madison Boot
- John Hunter Hospital Department of Otolaryngology - Head & Neck Surgery, New Lambton Heights, NSW, Australia
| | - Ryan Winters
- John Hunter Hospital Department of Otolaryngology - Head & Neck Surgery, New Lambton Heights, NSW, Australia
- Tulane University Department of Otolaryngology - Head & Neck Surgery
- Tulane University Division of Plastic & Reconstructive Surgery, New Orleans, Louisiana, USA
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Phillips JB, Galarza LI, Sink MC, Goza SD, Brown MI, Hopper SJ, Brown KW, Fernstrum CJ, Hoppe IC, Humphries LS. Longitudinal Speech and Fistula Outcomes Following Primary Cleft Palate Repair at a Single Institution. Ann Plast Surg 2024; 92:S404-S407. [PMID: 38857004 DOI: 10.1097/sap.0000000000003957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
INTRODUCTION Fistula formation and velopharyngeal insufficiency (VPI) are complications of cleft palate repair that often require surgical correction. The goal of the present study was to examine a single institution's experience with cleft palate repair with respect to fistula formation and need for surgery to correct velopharyngeal dysfunction. METHODS Institutional review board approval was obtained. Patient demographics and operative details over a 10-year period were collected. Primary outcomes measured were development of fistula and need for surgery to correct VPI. Chi-square tests and independent t tests were utilized to determine significance (0.05). RESULTS Following exclusion of patients without enough information for analysis, 242 patients were included in the study. Fistulas were reported in 21.5% of patients, and surgery to correct velopharyngeal dysfunction was needed in 10.7% of patients. Two-stage palate repair was associated with need for surgery to correct VPI (P = 0.014). Furlow palatoplasty was associated with decreased rate of fistula formation (P = 0.002) and decreased need for surgery to correct VPI (P = 0.014). CONCLUSION This study reiterates much of the literature regarding differing cleft palate repair techniques. A 2-stage palate repair is often touted as having less growth restriction, but the present study suggests this may yield an increased need for surgery to correct VPI. Prior studies of Furlow palatoplasty have demonstrated an association with higher rates of fistula formation. The present study demonstrated a decreased rate of fistula formation with the Furlow technique, which may be due to the use of the Children's Hospital of Philadelphia modification. This study suggests clinically superior outcomes of the Furlow palatoplasty over other techniques.
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Affiliation(s)
- John B Phillips
- From the Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Mississippi Medical Center, Jackson, MS
| | | | - Matthew C Sink
- From the Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Mississippi Medical Center, Jackson, MS
| | - Shelby D Goza
- From the Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Mississippi Medical Center, Jackson, MS
| | - Madyson I Brown
- From the Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Mississippi Medical Center, Jackson, MS
| | - Samuel J Hopper
- From the Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Mississippi Medical Center, Jackson, MS
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Al-Dourobi K, Mermod T, Doan MT, Herzog G, Broome M, El Ezzi O, de Buys Roessingh A. What We Learned from Performing the Inverse Malek Procedure to Repair Bilateral Cleft Lips and Palates: A Single-Center Retrospective Study. J Clin Med 2024; 13:1939. [PMID: 38610704 PMCID: PMC11012878 DOI: 10.3390/jcm13071939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 03/16/2024] [Accepted: 03/24/2024] [Indexed: 04/14/2024] Open
Abstract
Background: This study reviews the surgical and functional outcomes of children diagnosed with a bilateral cleft lip and palate and treated by the same surgical team following specific surgical protocols 18 years after surgery and during the follow-up. Methods: Based on a single-center retrospective design, demographic and surgical data were gathered by the authors from international institutions. Most of the data were quantitative in nature, and descriptive statistical and non-parametric tests were employed for analysis. All children born with a bilateral cleft from 1982 to 2002 were considered. Children affected by a syndrome were excluded. Complications and speech results were the main items measured. Results: Thirty patients were selected; 73.3% were treated using the inverse Malek procedure, and 26.7% underwent a modified two-stage procedure. Seventy percent developed an oronasal fistula. An alveolar bone graft was performed in 83%, and 53.3% underwent Le Fort osteotomy. Thirty-six percent required a pharyngeal flap, with good speech results. The median number of times general anesthesia was used among all the interventions considered was 5.5 (4.25-6). Conclusions: This study presents the long-term results of using the inverse Malek procedure to treat children with a bilateral cleft lip and palate. It is shown that this is related to a high risk of developing a fistula, but has good long-term speech results.
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Affiliation(s)
- Karim Al-Dourobi
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (K.A.-D.)
| | - Tessa Mermod
- Plastic, Reconstructive and Hand Surgery Service, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland; (K.A.-D.)
| | - Marie-Thérèse Doan
- Children and Adolescent Surgery Department, Multidisciplinary Consultations of Facial Cleft, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland (G.H.)
| | - Georges Herzog
- Children and Adolescent Surgery Department, Multidisciplinary Consultations of Facial Cleft, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland (G.H.)
| | - Martin Broome
- Children and Adolescent Surgery Department, Multidisciplinary Consultations of Facial Cleft, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland (G.H.)
| | - Oumama El Ezzi
- Children and Adolescent Surgery Department, Multidisciplinary Consultations of Facial Cleft, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland (G.H.)
| | - Anthony de Buys Roessingh
- Children and Adolescent Surgery Department, Multidisciplinary Consultations of Facial Cleft, Lausanne University Hospital, University of Lausanne, CH-1011 Lausanne, Switzerland (G.H.)
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Chen J, Yang R, Yin J, Shi B, Huang H. Current insights in the preclinical study of palatal wound healing and oronasal fistula after cleft palate repair. Front Cell Dev Biol 2023; 11:1271014. [PMID: 37900273 PMCID: PMC10601468 DOI: 10.3389/fcell.2023.1271014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 10/03/2023] [Indexed: 10/31/2023] Open
Abstract
Poor palatal wound healing after cleft palate repair could lead to unfavorable prognosis such as oronasal fistula (ONF), which might affect the patient's velopharyngeal function as well as their quality of life. Thus, restoring poor palatal wound healing for avoiding the occurrence of ONF should be considered the key to postoperative care after cleft palate repair. This review provided current insights in the preclinical study of poor palatal wound healing after cleft palate repair. This review comprehensively introduced the animal model establishment for palatal wound healing and related ONF, including the models by mice, rats, piglets, and dogs, and then demonstrated the aspects for investigating poor palatal wound healing and related treatments, including possible signaling pathways that could be involved in the formation of poor palatal wound healing, the related microbiota changes because of the deformity of palatal structure, and the studies for potential therapeutic strategies for palatal wound healing and ONF. The purpose of this review was to show the state of the art in preclinical studies about palatal wound healing after cleft palate repair and to show the promising aspects for better management of palatal wound healing.
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Affiliation(s)
- Jiali Chen
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Renjie Yang
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Eastern Clinic, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Jiayi Yin
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Bing Shi
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Hanyao Huang
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
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Lebhar MS, Goza SD, Humphries LS, Hoppe IC. Utilization of the Labial Flap in Anterior Palatal Fistula Repair. EPLASTY 2022; 22:e58. [PMID: 36545637 PMCID: PMC9748834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Background Palatal fistulas are the most common postoperative complications in primary cleft palate surgery, with incidence rates ranging from 10% to 30%. Functional indications for repair include food regurgitating from the nose, food impaction resulting in malodor, and hypernasality with speech. Anterior palatal fistulas (APFs), in particular, present difficult reconstructive cases due to lack of available local tissue. Here, we describe a case series of 3 patients who underwent APF repair with a random pattern labial flap. Methods The 3 patients included in this report underwent surgical repair of APF. The size of defects measured 2 × 1cm, 2.5 × 1.5cm, and 3 × 2cm. In each case, the labial flap was elevated on the free border of the superior lip mucosa and advanced through the alveolar cleft to cover the oral layer of the fistula. After 3 weeks, the proximal part of the pedicled flap was incised and inset to the alveolar ridge. Results From 2020 through 2021, 2 lip flaps were successful in providing full coverage to the oral fistula. In one patient, a 3-year-old who did not cooperate with postoperative care, one of the flaps dehisced before division. Conclusions APFs are common postoperative complications in patients with primary palate repairs and present difficult reconstructions due to lack of local tissue flaps. Here, we describe a 2-stage method in which a random pattern labial flap is used to provide oral fistula coverage. We recommend this procedure when multiple prior traditional attempts at closure have been unsuccessful and the patient can comply with postoperative care.
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Affiliation(s)
- Michael S Lebhar
- Department of Plastic and Reconstructive Surgery, University of Mississippi Medical Center, Jackson, MS
| | - Shelby D Goza
- Department of Plastic and Reconstructive Surgery, University of Mississippi Medical Center, Jackson, MS
| | - Laura S Humphries
- Department of Plastic and Reconstructive Surgery, University of Mississippi Medical Center, Jackson, MS
| | - Ian C Hoppe
- Department of Plastic and Reconstructive Surgery, University of Mississippi Medical Center, Jackson, MS,Correspondence: Ian C. Hoppe, MD;
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Obturator Manufacturing for Oronasal Fistula after Cleft Palate Repair: A Review from Handicraft to the Application of Digital Techniques. J Funct Biomater 2022; 13:jfb13040251. [PMID: 36412892 PMCID: PMC9680338 DOI: 10.3390/jfb13040251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/09/2022] [Accepted: 11/15/2022] [Indexed: 11/19/2022] Open
Abstract
An oronasal fistula (ONF) is an abnormal structure between the oral and nasal cavities, which is a common complication of cleft palate repair due to the failure of wound healing. When some patients with ONF are unsuitable for secondary surgical repair, the obturator treatment becomes a potential method. The objectives of the obturator treatment should be summarized as filling the ONF comfortably and cosmetically restoring the dentition with partial function. The anatomy of patients with cleft palate is complex, which may lead to a more complex structure of the ONF. Thus, the manufacturing process of the obturator for these patients is more difficult. For performing the design and fabrication process rapidly and precisely, digital techniques can help, but limitations still exist. In this review, literature searches were conducted through Medline via PubMed, Wiley Online Library, Science Direct, and Web of Science, and 122 articles were selected. The purpose of this review was to introduce the development of the obturator for treating patients with ONF after cleft palate repair, from the initial achievement of the obstruction of the ONF to later problems such as fixation, velopharyngeal insufficiency, and infection, as well as the application of digital technologies in obturator manufacturing.
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Zavala A, Miranda JV, Oré JF, De Pawlikowski W. Speech and swallowing function following microsurgical reconstruction of palatal defects in a series of six pediatric patients. Microsurgery 2022; 42:246-253. [PMID: 34985140 DOI: 10.1002/micr.30860] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 10/21/2021] [Accepted: 12/28/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND Reconstruction of extensive palatal defects in growing patients aims to restore speech intelligibility and swallowing function while avoiding excessive scarring formation that may cause growth disturbances in the palate and midface region. Free flaps transfer healthy, well-vascularized tissue to the defect area, and their combination with pharyngeal flaps allow for restoration of the velopharyngeal function. We examined speech and swallowing after microsurgical palate reconstruction in a series of six pediatric patients. METHODS Radial forearm free flaps were used in all cases, in combination with a superiorly based pharyngeal flap in five cases. Mean age at surgery was 10.7 years. Etiologies included recurrent oronasal fistula due to failed primary cleft palate repair (n = 4), embryonal rhabdomyosarcoma of the maxilla (n = 1), and inflammatory fibrous hyperplasia (n = 1). Speech evaluations (with the Hirose standard and listener ratings) and swallowing assessments (based on videofluoroscopy swallowing studies and patient-reported swallowing and diet) were performed in average 44 months postoperatively. RESULTS All flaps survived without major postoperative complications. Speech intelligibility was graded as "excellent" in four patients and "moderate" in two. Hypernasality and nasal obstruction were each judged as "none/minimal" in five cases and "moderate" in one case. All patients tolerated oral diet without significant nasal regurgitation. In five of six patients, the swallowing assessment showed good motion and velopharyngeal closure. CONCLUSION Microsurgical reconstruction of extensive palatal defects using radial forearm free flap, with or without a superiorly based pharyngeal flap, is a reliable technique that can deliver substantial improvement of speech and swallowing in pediatric patients.
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Affiliation(s)
- Abraham Zavala
- Department of Plastic and Reconstructive Surgery, Instituto Nacional de Salud del Niño - San Borja, Lima, Peru
| | - Juan V Miranda
- Department of Plastic and Reconstructive Surgery, Instituto Nacional de Salud del Niño - San Borja, Lima, Peru
| | - Juan F Oré
- Department of Head and Neck Surgery, Instituto Nacional de Salud del Niño - San Borja, Lima, Peru
| | - Wieslawa De Pawlikowski
- Department of Plastic and Reconstructive Surgery, Instituto Nacional de Salud del Niño - San Borja, Lima, Peru
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Wu Q, Li Z, Zhang Y, Peng X, Zhou X. Dental caries and periodontitis risk factors in cleft lip and palate patients. Front Pediatr 2022; 10:1092809. [PMID: 36683789 PMCID: PMC9846248 DOI: 10.3389/fped.2022.1092809] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 12/09/2022] [Indexed: 01/06/2023] Open
Abstract
Cleft lip and palate (CLP) is the most common congenital facial malformation and has a significant developmental, physical, and psychological impact on those with the deformity and their families. Risk factors contributing to CLP may conclude as genetic factors and environmental factors. The anatomical and morphological abnormalities related to CLP are favorable for dental plaque accumulation on the tooth surface. Therefore, patients with CLP undergo poorer oral hygiene and higher susceptibility to dental caries and periodontitis. In this review, we aim to conclude and update probable causes underlying the association between CLP and poor oral health and provide novel ideas of targeted early prevention for such oral diseases.
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Affiliation(s)
- Qinrui Wu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Zhengyi Li
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yixin Zhang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xian Peng
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Shetty V, Patteta NK, Yadav A, Bahl D, Sailer HF. Does the Timing of 1-Stage Palatoplasty With Radical Muscle Dissection Effect Long-Term Midface Growth? A Single-Center Retrospective Analysis. Cleft Palate Craniofac J 2021; 59:239-245. [PMID: 33955252 DOI: 10.1177/10556656211013174] [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] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE To evaluate the long-term effect of timing of 1-stage palatoplasty on midfacial growth in patients with cleft lip and palate (CLP). DESIGN Retrospective observational cohort study. STUDY SETTING Institutional hospital. PATIENTS One hundred twelve patients with CLP who underwent palatoplasty and were divided into 3 groups: group I: operated between 9 and 11 months; group II: operated between 18 and 20 months; and group III: operated between 21 and 24 months. INTERVENTIONS All patients underwent von Langenbeck palatoplasty technique, which was converted to a Bardach 2-flap technique in case of any technical difficulties. The patients were followed up between 8 and 9 years when they reported for secondary alveolar bone grafting. Postsurgical cephalometric and dental casts measurements were taken for midfacial growth analysis. MAIN OUTCOME MEASURES The cephalometric measures were analyzed for midfacial growth and compared within the groups. RESULTS Statistically significant difference (P < .01) was found on comparing the cephalometric parameters such as sella-nasion-A point angle (SNA), A point-nasion-B point angle (ANB), n toperpendicular to point A (N-perpA), condylon to point A (Co-A), anterior nasal spine to posterior nasal spine (ANS-PNS), nasion to Anterior nasal spine (N-ANS), nasion to menton (N Me), and witts appraisal (Witt (AO-BO)) in group I when compared to both group II and group III patients, implying deficient midfacial growth in group I. No statistical difference was found in the cephalometric values between group II and group III. Group II had better cephalometric measurements than group III, showing better growth in group II than group III. Overall, there was less incidence of midfacial hypoplasia in patients treated between 18 and 20 months (group II). CONCLUSION We conclude that palatal closure carried out at 18 to 20 months and 21 to 24 months is associated with better midfacial growth when compared to closure at 9 to 11 months. The best time to operate would be between 18 and 20 months to avoid speech disturbances. Midfacial growth can be greatly influenced by the timing of 1-stage palatoplasty.
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Affiliation(s)
- Vikram Shetty
- Nitte Meenakshi Institute of Craniofacial Surgery, NITTE Deemed to be University, Mangalore, India
| | - Nanda Kishore Patteta
- Department of Cleft and Craniofacial Orthodontics, NITTE Meenakshi Institute of Craniofacial Surgery, NITTE Deemed to be University, Mangalore, India
| | - Anirudh Yadav
- Department of Oral and Maxillofacial Surgery, A.B. Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
| | - Devyani Bahl
- Department of Oral and Maxillofacial Surgery, A.B. Shetty Memorial Institute of Dental Sciences, NITTE Deemed to be University, Mangalore, India
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Persistent Fistula of the Palate: Cleft Surgery Meets Microsurgery for the Next Rung of the Ladder. Plast Reconstr Surg 2021; 147:178e-179e. [PMID: 33048849 DOI: 10.1097/prs.0000000000007479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Toyota A, Shinagawa R, Mano M, Tokioka K, Suda N. Regeneration in Experimental Alveolar Bone Defect Using Human Umbilical Cord Mesenchymal Stem Cells. Cell Transplant 2021; 30:963689720975391. [PMID: 33573392 PMCID: PMC7883160 DOI: 10.1177/0963689720975391] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Cleft lip and palate is a congenital disorder including cleft lip, and/or cleft palate, and/or alveolar cleft, with high incidence.The alveolar cleft causes morphological and functional abnormalities. To obtain bone bridge formation and continuous structure between alveolar clefts, surgical interventions are performed from infancy to childhood. However, desirable bone bridge formation is not obtained in many cases. Regenerative medicine using mesenchymal stem cells (MSCs) is expected to be a useful strategy to obtain sufficient bone bridge formation between alveolar clefts. In this study, we examined the effect of human umbilical cord-derived MSCs by transplantation into a rat experimental alveolar cleft model. Human umbilical cords were digested enzymatically and the isolated cells were collected (UC-EZ cells). Next, CD146-positive cells were enriched from UC-EZ cells by magnetic-activated cell sorting (UC-MACS cells). UC-EZ and UC-MACS cells showed MSC gene/protein expression, in vitro. Both cells had multipotency and could differentiate to osteogenic, chondrogenic, and adipogenic lineages under the differentiation-inducing media. However, UC-EZ cells lacked Sox2 expression and showed the lower ratio of MSCs than UC-MACS cells. Thus, UC-MACS cells were transplanted with hydroxyapatite and collagen (HA + Col) into alveolar cleft model to evaluate bone formation in vivo. The results of micro computed tomography and histological staining showed that UC-MACS cells with HA + Col induced more abundant bone formation between the experimental alveolar clefts than HA + Col implantation only. Cells immunopositive for osteopontin were accumulated along the bone surface and some of them were embedded in the bone. Cells immunopositive for human-specific mitochondria were aligned along the newly formed bone surface and in the new bone, suggesting that UC-MACS cells contributed to the bone bridge formation between alveolar clefts. These findings indicate that human umbilical cords are reliable bioresource and UC-MACS cells are useful for the alveolar cleft regeneration.
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Affiliation(s)
- Akiko Toyota
- Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry, Saitama, Japan
| | - Rei Shinagawa
- Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry, Saitama, Japan
| | - Mikiko Mano
- Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry, Saitama, Japan
| | - Kazuyuki Tokioka
- Department of Plastic and Reconstructive Surgery, Saitama Medical University, Saitama, Japan
| | - Naoto Suda
- Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry, Saitama, Japan
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