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Hong JW, Yu Y, Wang LS, Li Z, Zhang R, Wang Q, Ding Z, Zhang JP, Zhang MR, Xu LC. BMP4 Regulates EMT to be Involved in non-Syndromic Cleft lip With or Without Palate. Cleft Palate Craniofac J 2023; 60:1462-1473. [PMID: 35702016 DOI: 10.1177/10556656221105762] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE In the previous study, we identified bone morphogenetic protein 4 (BMP4) responsible for non-syndromic cleft lip with or without cleft palate (NSCL/P). We aimed to elucidate the effects and mechanisms of BMP4 on epithelial-mesenchymal transition (EMT) through Smad1 signaling pathway to be involved in NSCL/P. METHODS The human oral epidermoid carcinoma cells (KBs) were transfected with plasmids or small interfering RNA (siRNA) to build the models. The migration of the cells was evaluated by transwell assay. Western blotting and quantitative real-time reverse transcription-polymerase chain reaction (qRT-PCR) were used to detect the expressions of BMP4, E-cadherin, N-cadherin, EMT-related transcription factors snal1 and snal2, matrix metalloproteinase 2 (MMP2), MMP9, Smad1, and phosphorylated Smad1. RESULTS In the overexpression group, the migration number of cells was increased significantly. The protein expression of E-cadherin was decreased significantly, while the protein expression level of the N-cadherin was increased significantly. The protein and mRNA expressions of MMP2, MMP9, snal1, and snal2 were significantly higher. The expression level of Smad1 was not significantly changed, while the phosphorylation of Smad1 was significantly increased. In the BMP4-siRNA group, the migrating number cells was significantly decreased. The protein expression of E-cadherin was increased significantly, while the expression of N-cadherin was significantly decreased. The protein and mRNA expressions of MMP2, MMP9, snal1, and snal2 were significantly lower than that of the control group. The expressions of Smad1 and phosphorylation of Smad1 were not significantly changed. CONCLUSIONS BMP4 enhances cell migration and promotes cell EMT through Smad1 signaling pathway. Abnormal BMP4 mediates migration and EMT through other relevant signaling pathways resulting in NSCL/P. The study provides new insight into the mechanisms of NSCL/P associated with BMP4.n.
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Affiliation(s)
- Jia-Wei Hong
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Yue Yu
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Lu-Shan Wang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Zheng Li
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Rui Zhang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Qi Wang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Zhen Ding
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Jin-Peng Zhang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Mei-Rong Zhang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
| | - Li-Chun Xu
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Jiangsu, China
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2
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Mukhopadhyay P, Smolenkova I, Seelan RS, Pisano MM, Greene RM. Spatiotemporal Expression and Functional Analysis of miRNA-22 in the Developing Secondary Palate. Cleft Palate Craniofac J 2023; 60:27-38. [PMID: 34730446 DOI: 10.1177/10556656211054004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVE Normal development of the embryonic orofacial region requires precise spatiotemporal coordination between numerous genes. MicroRNAs represent small, single-stranded, non-coding molecules that regulate gene expression. This study examines the role of microRNA-22 (miR-22) in murine orofacial ontogeny. METHODS Spatiotemporal and differential expression of miR-22 (mmu-miR-22-3p) within the developing secondary palate was determined by in situ hybridization and quantitative real-time PCR, respectively. Bioinformatic approaches were used to predict potential mRNA targets of miR-22 and analyze their association with cellular functions indispensable for normal orofacial ontogeny. An in vitro palate organ culture system was used to assess the role of miR-22 in secondary palate development. RESULTS There was a progressive increase in miR-22 expression from GD12.5 to GD14.5 in palatal processes. On GD12.5 and GD13.5, miR-22 was expressed in the future oral, nasal, and medial edge epithelia. On GD14.5, miR-22 expression was observed in the residual midline epithelial seam (MES), the nasal epithelium and the mesenchyme, but not in the oral epithelium. Inhibition of miR-22 activity in palate organ cultures resulted in failure of MES removal. Bioinformatic analyses revealed potential mRNA targets of miR-22 that may play significant roles in regulating apoptosis, migration, and/or convergence/extrusion, developmental processes that modulate MES removal during palatogenesis. CONCLUSIONS Results from the current study suggest a key role for miR-22 in the removal of the MES during palatogenesis and that miR-22 may represent a potential contributor to the etiology of cleft palate.
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Affiliation(s)
- Partha Mukhopadhyay
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, School of Dentistry, 5170University of Louisville, Louisville, KY 40202
| | - Irina Smolenkova
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, School of Dentistry, 5170University of Louisville, Louisville, KY 40202
| | - Ratnam S Seelan
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, School of Dentistry, 5170University of Louisville, Louisville, KY 40202
| | - M Michele Pisano
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, School of Dentistry, 5170University of Louisville, Louisville, KY 40202
| | - Robert M Greene
- Department of Oral Immunology and Infectious Diseases, Division of Craniofacial Development and Anomalies, School of Dentistry, 5170University of Louisville, Louisville, KY 40202
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3
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Rafighdoost H, Hashemi M, Danesh H, Bizhani F, Bahari G, Taheri M. Association of single nucleotide polymorphisms in AXIN2, BMP4, and IRF6 with Non-Syndromic Cleft Lip with or without Cleft Palate in a sample of the southeast Iranian population. J Appl Oral Sci 2018; 25:650-656. [PMID: 29211286 PMCID: PMC5701535 DOI: 10.1590/1678-7757-2017-0191] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 06/30/2017] [Indexed: 01/25/2023] Open
Abstract
Non-syndromic cleft lip with or without palate (NSCL/P) is a common congenital malformation worldwide, with complex etiology. It has been proposed that interaction of genes and environmental factors play a role in the predisposition to this disease.
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Affiliation(s)
- Houshang Rafighdoost
- Zahedan University of Medical Sciences, Cellular and Molecular Research Center, Zahedan, Iran.,Zahedan University of Medical Sciences, School of Medicine, Department of Anatomy, Zahedan, Iran
| | - Mohammad Hashemi
- Zahedan University of Medical Sciences, School of Medicine, Department of Clinical Biochemistry, Zahedan, Iran
| | - Hiva Danesh
- Zahedan University of Medical Sciences, School of Medicine, Department of Clinical Biochemistry, Zahedan, Iran
| | - Fatemeh Bizhani
- Zahedan University of Medical Sciences, School of Medicine, Department of Clinical Biochemistry, Zahedan, Iran
| | - Gholamreza Bahari
- Zahedan University of Medical Sciences, School of Medicine, Department of Clinical Biochemistry, Zahedan, Iran
| | - Mohsen Taheri
- Genetic of Non-Communicable Disease Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
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4
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Common mechanisms in development and disease: BMP signaling in craniofacial development. Cytokine Growth Factor Rev 2015; 27:129-39. [PMID: 26747371 DOI: 10.1016/j.cytogfr.2015.11.004] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Accepted: 11/13/2015] [Indexed: 01/04/2023]
Abstract
BMP signaling is one of the key pathways regulating craniofacial development. It is involved in the early patterning of the head, the development of cranial neural crest cells, and facial patterning. It regulates development of its mineralized structures, such as cranial bones, maxilla, mandible, palate, and teeth. Targeted mutations in the mouse have been instrumental to delineate the functional involvement of this signaling network in different aspects of craniofacial development. Gene polymorphisms and mutations in BMP pathway genes have been associated with various non-syndromic and syndromic human craniofacial malformations. The identification of intricate cellular interactions and underlying molecular pathways illustrate the importance of local fine-regulation of Bmp signaling to control proliferation, apoptosis, epithelial-mesenchymal interactions, and stem/progenitor differentiation during craniofacial development. Thus, BMP signaling contributes both to shape and functionality of our facial features. BMP signaling also regulates postnatal craniofacial growth and is associated with dental structures life-long. A more detailed understanding of BMP function in growth, homeostasis, and repair of postnatal craniofacial tissues will contribute to our ability to rationally manipulate this signaling network in the context of tissue engineering.
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5
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Association between BMP4 rs17563 polymorphism and NSCL/P risk: a meta-analysis. DISEASE MARKERS 2015; 2015:763090. [PMID: 25648829 PMCID: PMC4306361 DOI: 10.1155/2015/763090] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 12/20/2014] [Accepted: 12/22/2014] [Indexed: 12/21/2022]
Abstract
Objective. To investigate the association between bone morphogenetic protein 4 (BMP4) rs17563 polymorphism and nonsyndromic cleft lip with or without palate (NSCL/P) risk. Methods. Four online databases were researched and the related publications were collected. Odds ratio (OR) with 95% confidence interval (CI) was applied to assess the relationship; publication bias, metaregression, and sensitivity analysis were conducted to guarantee the strength of results. Results. Six published case-control studies were collected. Overall, no significant association between BMP4 rs17563 polymorphism and NSCL/P risk was found. It was notable that significant susceptibility on different ethnicity was observed in the stratified analysis. For Chinese population, the BMP4 rs17563 polymorphism was a significantly increased risk for NSCL/P (C versus T: OR = 1.52, 95% CI = 1.28–1.82, P < 0.01,
I2 = 0%; CC versus TT: OR = 2.58, 95% CI = 1.74–3.82,
P < 0.01,
I2 = 0%; TC + CC versus TT: OR = 1.45, 95% CI = 1.14–1.84,
P < 0.01,
I2 = 0%; CC versus TT + TC: OR=2.46, 95% CI = 1.46–4.14,
P < 0.01, I2 = 47.0%). On the contrary, significantly protective effects were found in Brazilian population (C versus T: OR = 0.69, 95% CI = 0.50–0.96, P = 0.03,
I2 = 68.5%; TC versus TT: OR = 0.52, 95% CI = 0.40–0.68,
P < 0.01,
I2 = 0%; TC + CC versus TT: OR = 0.52, 95% CI = 0.35–0.78,
P < 0.010,
I2 = 54.4%). Conclusion. This meta-analysis indicated that BMP4 rs17563 polymorphism could play a different role during the development of NSCL/P based on ethnicity diversity.
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6
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Sabóia TM, Reis MF, Martins ÂMC, Romanos HF, Tannure PN, Granjeiro JM, Vieira AR, Antunes LS, Küchler EC, Costa MC. DLX1 and MMP3 contribute to oral clefts with and without positive family history of cancer. Arch Oral Biol 2014; 60:223-8. [PMID: 25463899 DOI: 10.1016/j.archoralbio.2014.10.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 07/11/2014] [Accepted: 10/08/2014] [Indexed: 01/24/2023]
Abstract
OBJECTIVE It has been suggested that oral clefts and cancer share a common genetic background. This study aimed to investigate the epidemiological and molecular association between oral clefts and cancer. METHODS One hundred forty-eight nuclear families with oral clefts and 162 subjects with no birth defect were recruited. Data on self-reported family history of cancer among first, second, and third degree relatives of each patient were collected via a structured questionnaire. We also investigated the association between polymorphisms in the genes AXIN2, BMP2, BMP4, BMP7, DLX1, DLX2, and MMP3 and oral cleft with and without history of cancer. Markers in these genes were genotyped using real time PCR. Chi-square and t-test were used to assess the differences about self-reported family history of cancer between oral cleft and non-cleft individuals. The transmission disequilibrium test (TDT) was used to analyze the distortion of the inheritance of alleles from parents to their affected offspring. RESULTS Families with oral clefts had an increased risk of having a family history of cancer (p=0.01; odds ratio=1.79; 95% confidence interval, 1.07-1.87). TDT results showed an association between DLX1 and cleft lip and palate, in which the A allele was undertransmited (p=0.022). For MMP3, G was undertransmited among affected progeny (p=0.019) in cleft palate subgroup. CONCLUSION Oral clefts were associated with positive self-reported family history of cancer and with variants in DLX1 and MMP3. The association between oral clefts and cancer raises interesting possibilities to identify risk markers for cancer.
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Affiliation(s)
- Ticiana M Sabóia
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, RJ, Brazil
| | - Maria Fernanda Reis
- Unit of Clinical Research, Fluminense Federal University, Niterói, RJ, Brazil
| | - Ângela M C Martins
- Department of Specific Formation, School of Dentistry, Fluminense Federal University, Nova Friburgo, RJ, Brazil
| | - Helena F Romanos
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, RJ, Brazil
| | - Patricia N Tannure
- Discipline of Pediatric Dentistry, School of Dentistry, Veiga de Almeida University, RJ, Brazil
| | - José Mauro Granjeiro
- Unit of Clinical Research, Fluminense Federal University, Niterói, RJ, Brazil; Bioengineering Program, National Institute of Metrology, Quality and Technology (INMETRO), Duque de Caxias, RJ, Brazil
| | - Alexandre R Vieira
- Department of Oral Biology and Center for Craniofacial and Dental Genetics, University of Pittsburgh, Pittsburgh, PA, USA; Department of Pediatric Dentistry, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA; Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Leonardo S Antunes
- Unit of Clinical Research, Fluminense Federal University, Niterói, RJ, Brazil; Department of Specific Formation, School of Dentistry, Fluminense Federal University, Nova Friburgo, RJ, Brazil.
| | - Erika C Küchler
- Department of Oral Biology and Center for Craniofacial and Dental Genetics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Marcelo C Costa
- Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, RJ, Brazil
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Retinoic acid remodels extracellular matrix (ECM) of cultured human fetal palate mesenchymal cells (hFPMCs) through down-regulation of TGF-β/Smad signaling. Toxicol Lett 2014; 225:208-15. [DOI: 10.1016/j.toxlet.2013.12.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Revised: 12/13/2013] [Accepted: 12/13/2013] [Indexed: 01/28/2023]
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8
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Li L, Wang Y, Lin M, Yuan G, Yang G, Zheng Y, Chen Y. Augmented BMPRIA-mediated BMP signaling in cranial neural crest lineage leads to cleft palate formation and delayed tooth differentiation. PLoS One 2013; 8:e66107. [PMID: 23776616 PMCID: PMC3680418 DOI: 10.1371/journal.pone.0066107] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 05/01/2013] [Indexed: 01/11/2023] Open
Abstract
The importance of BMP receptor Ia (BMPRIa) mediated signaling in the development of craniofacial organs, including the tooth and palate, has been well illuminated in several mouse models of loss of function, and by its mutations associated with juvenile polyposis syndrome and facial defects in humans. In this study, we took a gain-of-function approach to further address the role of BMPR-IA-mediated signaling in the mesenchymal compartment during tooth and palate development. We generated transgenic mice expressing a constitutively active form of BmprIa (caBmprIa) in cranial neural crest (CNC) cells that contributes to the dental and palatal mesenchyme. Mice bearing enhanced BMPRIa-mediated signaling in CNC cells exhibit complete cleft palate and delayed odontogenic differentiation. We showed that the cleft palate defect in the transgenic animals is attributed to an altered cell proliferation rate in the anterior palatal mesenchyme and to the delayed palatal elevation in the posterior portion associated with ectopic cartilage formation. Despite enhanced activity of BMP signaling in the dental mesenchyme, tooth development and patterning in transgenic mice appeared normal except delayed odontogenic differentiation. These data support the hypothesis that a finely tuned level of BMPRIa-mediated signaling is essential for normal palate and tooth development.
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Affiliation(s)
- Lu Li
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, United States of America
| | - Ying Wang
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, United States of America
- Department of Operative Dentistry and Endodontics, College of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi Province, P.R. China
| | - Minkui Lin
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, United States of America
- Department of Periodontology, College of Stomatology, Fujian Medical University, Fuzhou, Fujian Province, P.R. China
| | - Guohua Yuan
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, United States of America
- Department of Pediatric Dentistry, College of Stomatology, Wuhan University, Wuhan, Hubei Province, P.R. China
| | - Guobin Yang
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, United States of America
- Department of Pediatric Dentistry, College of Stomatology, Wuhan University, Wuhan, Hubei Province, P.R. China
| | - Yuqian Zheng
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, United States of America
- Department of Periodontology, College of Stomatology, Fujian Medical University, Fuzhou, Fujian Province, P.R. China
| | - YiPing Chen
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, United States of America
- * E-mail:
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9
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The etiology of cleft palate formation in BMP7-deficient mice. PLoS One 2013; 8:e59463. [PMID: 23516636 PMCID: PMC3597594 DOI: 10.1371/journal.pone.0059463] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 02/18/2013] [Indexed: 12/18/2022] Open
Abstract
Palatogenesis is a complex process implying growth, elevation and fusion of the two lateral palatal shelves during embryogenesis. This process is tightly controlled by genetic and mechanistic cues that also coordinate the growth of other orofacial structures. Failure at any of these steps can result in cleft palate, which is a frequent craniofacial malformation in humans. To understand the etiology of cleft palate linked to the BMP signaling pathway, we studied palatogenesis in Bmp7-deficient mouse embryos. Bmp7 expression was found in several orofacial structures including the edges of the palatal shelves prior and during their fusion. Bmp7 deletion resulted in a general alteration of oral cavity morphology, unpaired palatal shelf elevation, delayed shelf approximation, and subsequent lack of fusion. Cell proliferation and expression of specific genes involved in palatogenesis were not altered in Bmp7-deficient embryos. Conditional ablation of Bmp7 with Keratin14-Cre or Wnt1-Cre revealed that neither epithelial nor neural crest-specific loss of Bmp7 alone could recapitulate the cleft palate phenotype. Palatal shelves from mutant embryos were able to fuse when cultured in vitro as isolated shelves in proximity, but not when cultured as whole upper jaw explants. Thus, deformations in the oral cavity of Bmp7-deficient embryos such as the shorter and wider mandible were not solely responsible for cleft palate formation. These findings indicate a requirement for Bmp7 for the coordination of both developmental and mechanistic aspects of palatogenesis.
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10
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Ackermans MMG, Zhou H, Carels CEL, Wagener FADTG, Von den Hoff JW. Vitamin A and clefting: putative biological mechanisms. Nutr Rev 2011; 69:613-24. [DOI: 10.1111/j.1753-4887.2011.00425.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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11
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Sahoo T, Theisen A, Sanchez-Lara PA, Marble M, Schweitzer DN, Torchia BS, Lamb AN, Bejjani BA, Shaffer LG, Lacassie Y. Microdeletion 20p12.3 involving BMP2 contributes to syndromic forms of cleft palate. Am J Med Genet A 2011; 155A:1646-53. [PMID: 21671386 DOI: 10.1002/ajmg.a.34063] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Accepted: 03/20/2011] [Indexed: 11/05/2022]
Abstract
Orofacial clefts of the lip and/or palate comprise one of the most common craniofacial birth defects in humans. Though a majority of cleft lip and/or cleft palate (CL/P) occurs as isolated congenital anomalies, there exist a large number of Mendelian disorders in which orofacial clefting is part of the clinical phenotype. Here we report on two individuals and one multi-generational family with microdeletions at 20p12.3 that include the bone morphogenetic protein 2 (BMP2) gene. In two propositi the deletion was almost identical at ∼600 kb in size, and BMP2 was the only gene deleted; the third case had a ∼5.5-Mb deletion (20p13p12.2) that encompassed at least 20 genes including BMP2. Clinical features were significant for cleft palate and facial dysmorphism in all three patients, including Pierre-Robin sequence in two. Microdeletion 20p13p12 involving BMP2 is rare and has been implicated in Wolff-Parkinson-White (WPW) syndrome with neurocognitive deficits and with Alagille syndrome when the deletion includes the neighboring JAG1 gene in addition to BMP2. Despite a significant role for the BMPs in orofacial development, heterozygous loss of BMP2 has not been previously reported in patients with syndromic clefting defects. Because BMP2 was the sole deleted gene in Patients 1 and 2 and one of the genes deleted in Patient 3, all of whom had clinical features in common, we suggest that haploinsufficiency for BMP2 is a crucial event that predisposes to cleft palate and additional anomalies. Lack of significant phenotypic components in family members of Patient 1 suggests variable expressivity for the phenotype.
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Lv H, Fu S, Wu G, Yan F. PHEX neutralizing agent inhibits dentin formation in mouse tooth germ. Tissue Cell 2011; 43:125-30. [PMID: 21324501 DOI: 10.1016/j.tice.2010.12.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 12/19/2010] [Accepted: 12/27/2010] [Indexed: 10/18/2022]
Abstract
The mutation of phosphate-regulating gene with homologies to endopeptidases on the X-chromosome (PHEX) can lead to human X-linked hypophosphatemic rickets which displays hypo-mineralization in bone and dentin. To study its possible roles in teeth, PHEX antibody was injected into pregnant mice on E15 to explore its roles on the formation of enamel and dentin. Mallory trichrome staining results showed that arrangements of ameloblasts and odontoblasts were irregular after PHEX antibody treatment. Differentiation of odontoblasts and the formation of dentin were inhibited. Spatiotemporal distribution of PHEX protein was observed in various stages of tooth germ. Immunohistochemical results showed positive PHEX signals appeared in the inner enamel epithelium on E16 and became stronger on E18. Ameloblasts and odontoblasts showed much higher PHEX expression on P1 and P3. Expression of PHEX in odontoblasts decreased accordingly. However, enamel formation was only slightly affected. The findings proved that a decrease in PHEX expression could suppress dentin formation.
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Affiliation(s)
- Hongbing Lv
- Department of Endodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China
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13
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del Río A, Barrio M, Murillo J, Maldonado E, López-Gordillo Y, Martínez-Sanz E, Martínez M, Martínez-Álvarez C. Analysis of the Presence of Cell Proliferation-Related Molecules in the Tgf-β 3 Null Mutant Mouse Palate Reveals Misexpression of EGF and Msx-1. Cells Tissues Organs 2011; 193:135-50. [DOI: 10.1159/000319970] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2010] [Indexed: 02/03/2023] Open
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14
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Fu S, Lv HB, Liu Y, Zhao Y, He LS, Jin Y. Transfection of truncated bone morphogenetic protein receptor-II into oral squamous cell carcinoma cell line Tca8113 and inhibitory effect on proliferation and inductive effect on apoptosis. J Oral Pathol Med 2010; 40:490-6. [PMID: 21496104 DOI: 10.1111/j.1600-0714.2010.00988.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bone morphogenetic proteins (BMPs), one of the crucial regulators in embryonic development and bone formation, have been implicated in epithelium-derived tumors. Previous results showed the involvement of overexpression of BMP 2, 4, 5 in the carcinogenesis of oral epithelia. The ability of BMP receptor-II mutant to modify the malignant phenotype of oral squamous cell carcinoma cell line Tca8113 by blocking the BMP signal transduction pathway has been proposed. In this study, a negative truncated mutant of the BMP receptor-II (tBMPR-II) was transfected into Tca8113 cells. The effects were evaluated though RT-PCR, 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay, BrdU staining, cell cyclin assay, TdT-mediated dUTP nick end labeling (TUNEL) staining, and cell cycle protein detection. Overexpression of tBMPR-II gene transfection truncates the expression of BMPR-II mRNA expression, but not BMP 2, 4, 5. tBMPR-II resulted in a remarkable inhibition of cell proliferation and viability compared with control Tca8113. The inhibitory effects were partly attributed to the induction of apoptosis and cell cycle arrest in G(0) /G(1) accompanied by downregulation of the intracellular cell cycle proteins of cyclin D1 and cyclin-dependent kinases 4, as well as the upregulation of p27 and p57. Loss of BMP signals correlates tightly with suppression of cell proliferation, induction of apoptosis, and benign transformation of Tca8113 cells phenotype.
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Affiliation(s)
- Sheng Fu
- Department of Oral and Maxillofacial Surgery, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou, China
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15
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He F, Xiong W, Wang Y, Matsui M, Yu X, Chai Y, Klingensmith J, Chen Y. Modulation of BMP signaling by Noggin is required for the maintenance of palatal epithelial integrity during palatogenesis. Dev Biol 2010; 347:109-21. [PMID: 20727875 PMCID: PMC3010875 DOI: 10.1016/j.ydbio.2010.08.014] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2010] [Revised: 08/11/2010] [Accepted: 08/12/2010] [Indexed: 11/29/2022]
Abstract
BMP signaling plays many important roles during organ development, including palatogenesis. Loss of BMP signaling leads to cleft palate formation. During development, BMP activities are finely tuned by a number of modulators at the extracellular and intracellular levels. Among the extracellular BMP antagonists is Noggin, which preferentialy binds to BMP2, BMP4 and BMP7, all of which are expressed in the developing palatal shelves. Here we use targeted Noggin mutant mice as a model for gain of BMP signaling function to investigate the role of BMP signaling in palate development. We find prominent Noggin expression in the palatal epithelium along the anterior-posterior axis during early palate development. Loss of Noggin function leads to overactive BMP signaling, particularly in the palatal epithelium. This results in disregulation of cell proliferation, excessive cell death, and changes in gene expression, leading to formation of complete palatal cleft. The excessive cell death in the epithelium disrupts the palatal epithelium integrity, which in turn leads to an abnormal palate-mandible fusion and prevents palatal shelf elevation. This phenotype is recapitulated by ectopic expression of a constitutively active form of BMPR-IA but not BMPR-IB in the epithelium of the developing palate; this suggests a role for BMPR-IA in mediating overactive BMP signaling in the absence of Noggin. Together with the evidence that overexpression of Noggin in the palatal epithelium does not cause a cleft palate defect, we conclude from our results that Noggin mediated modulation of BMP signaling is essential for palatal epithelium integrity and for normal palate development.
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Affiliation(s)
- Fenglei He
- Department of Cell and Molecular Biology Tulane University New Orleans, LA 70118, USA
| | - Wei Xiong
- Department of Cell and Molecular Biology Tulane University New Orleans, LA 70118, USA
| | - Ying Wang
- Department of Cell and Molecular Biology Tulane University New Orleans, LA 70118, USA
| | - Maiko Matsui
- Department of Cell Biology Duke University Medical Center, Durham, NC 27710, USA
| | - Xueyan Yu
- Department of Cell and Molecular Biology Tulane University New Orleans, LA 70118, USA
| | - Yang Chai
- Center for Craniofacial Molecular Biology University of Southern California Los Angeles, CA 90033, USA
| | - John Klingensmith
- Department of Cell Biology Duke University Medical Center, Durham, NC 27710, USA
| | - YiPing Chen
- Department of Cell and Molecular Biology Tulane University New Orleans, LA 70118, USA
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BmprIa is required in mesenchymal tissue and has limited redundant function with BmprIb in tooth and palate development. Dev Biol 2010; 349:451-61. [PMID: 21034733 DOI: 10.1016/j.ydbio.2010.10.023] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 09/30/2010] [Accepted: 10/20/2010] [Indexed: 01/09/2023]
Abstract
The BMP signaling plays a pivotal role in the development of craniofacial organs, including the tooth and palate. BmprIa and BmprIb encode two type I BMP receptors that are primarily responsible for BMP signaling transduction. We investigated mesenchymal tissue-specific requirement of BmprIa and its functional redundancy with BmprIb during the development of mouse tooth and palate. BmprIa and BmprIb exhibit partially overlapping and distinct expression patterns in the developing tooth and palatal shelf. Neural crest-specific inactivation of BmprIa leads to formation of an unusual type of anterior clefting of the secondary palate, an arrest of tooth development at the bud/early cap stages, and severe hypoplasia of the mandible. Defective tooth and palate development is accompanied by the down-regulation of BMP-responsive genes and reduced cell proliferation levels in the palatal and dental mesenchyme. To determine if BmprIb could substitute for BmprIa during tooth and palate development, we expressed a constitutively active form of BmprIb (caBmprIb) in the neural crest cells in which BmprIa was simultaneously inactivated. We found that substitution of BmprIa by caBmprIb in neural rest cells rescues the development of molars and maxillary incisor, but the rescued teeth exhibit a delayed odontoblast and ameloblast differentiation. In contrast, caBmprIb fails to rescue the palatal and mandibular defects including the lack of lower incisors. Our results demonstrate an essential role for BmprIa in the mesenchymal component and a limited functional redundancy between BmprIa and BmprIb in a tissue-specific manner during tooth and palate development.
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Greene RM, Pisano MM. Palate morphogenesis: current understanding and future directions. ACTA ACUST UNITED AC 2010; 90:133-54. [PMID: 20544696 DOI: 10.1002/bdrc.20180] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In the past, most scientists conducted their inquiries of nature via inductivism, the patient accumulation of "pieces of information" in the pious hope that the sum of the parts would clarify the whole. Increasingly, modern biology employs the tools of bioinformatics and systems biology in attempts to reveal the "big picture." Most successful laboratories engaged in the pursuit of the secrets of embryonic development, particularly those whose research focus is craniofacial development, pursue a middle road where research efforts embrace, rather than abandon, what some have called the "pedestrian" qualities of inductivism, while increasingly employing modern data mining technologies. The secondary palate has provided an excellent paradigm that has enabled examination of a wide variety of developmental processes. Examination of cellular signal transduction, as it directs embryogenesis, has proven exceptionally revealing with regard to clarification of the "facts" of palatal ontogeny-at least the facts as we currently understand them. Herein, we review the most basic fundamentals of orofacial embryology and discuss how functioning of TGFbeta, BMP, Shh, and Wnt signal transduction pathways contributes to palatal morphogenesis. Our current understanding of palate medial edge epithelial differentiation is also examined. We conclude with a discussion of how the rapidly expanding field of epigenetics, particularly regulation of gene expression by miRNAs and DNA methylation, is critical to control of cell and tissue differentiation, and how examination of these epigenetic processes has already begun to provide a better understanding of, and greater appreciation for, the complexities of palatal morphogenesis.
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Affiliation(s)
- Robert M Greene
- Department of Molecular, Cellular and Craniofacial Biology, University of Louisville, Birth Defects Center, ULSD, Louisville, Kentucky 40292, USA.
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Zouvelou V, Luder HU, Mitsiadis TA, Graf D. Deletion of BMP7 affects the development of bones, teeth, and other ectodermal appendages of the orofacial complex. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2009; 312B:361-74. [DOI: 10.1002/jez.b.21262] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Meng L, Bian Z, Torensma R, Von den Hoff JW. Biological mechanisms in palatogenesis and cleft palate. J Dent Res 2009; 88:22-33. [PMID: 19131313 DOI: 10.1177/0022034508327868] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Clefts of the palate are common birth defects requiring extensive treatment. They appear to be caused by multiple genetic and environmental factors during palatogenesis. This may result in local changes in growth factors, extracellular matrix (ECM), and cell adhesion molecules. Several clefting factors have been implicated by studies in mouse models, while some of these have also been confirmed by genetic screening in humans. Here, we discuss several knockout mouse models to examine the role of specific genes in cleft formation. The cleft is ultimately caused by interference with shelf elevation, attachment, or fusion. Shelf elevation is brought about by mesenchymal proliferation and changes in the ECM induced by growth factors such as TGF-betas. Crucial ECM molecules are collagens, proteoglycans, and glycosaminoglycans. Shelf attachment depends on specific differentiation of the epithelium involving TGF-beta3, sonic hedgehog, and WNT signaling, and correct expression of epithelial adhesion molecules such as E-cadherin. The final fusion requires epithelial apoptosis and epithelium-to-mesenchyme transformation regulated by TGF-beta and WNT proteins. Other factors may interact with these signaling pathways and contribute to clefting. Normalization of the biological mechanisms regulating palatogenesis in susceptible fetuses is expected to contribute to cleft prevention.
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Affiliation(s)
- L Meng
- Department of Orthodontics and Oral Biology, Radboud University Nijmegen Medical Centre, PO Box 9101, 6500 HB Nijmegen, The Netherlands
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Mukhopadhyay P, Webb CL, Warner DR, Greene RM, Pisano MM. BMP signaling dynamics in embryonic orofacial tissue. J Cell Physiol 2008; 216:771-9. [PMID: 18446813 DOI: 10.1002/jcp.21455] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The bone morphogenetic protein (BMP) family represents a class of signaling molecules, that plays key roles in morphogenesis, cell proliferation, survival and differentiation during normal development. Members of this family are essential for the development of the mammalian orofacial region where they regulate cell proliferation, extracellular matrix synthesis, and cellular differentiation. Perturbation of any of these processes results in orofacial clefting. Embryonic orofacial tissue expresses BMP mRNAs, their cognate proteins, and BMP-specific receptors in unique temporo-spatial patterns, suggesting functional roles in orofacial development. However, specific genes that function as downstream mediators of BMP action during orofacial ontogenesis have not been well defined. In the current study, elements of the Smad component of the BMP intracellular signaling system were identified and characterized in embryonic orofacial tissue and functional activation of the Smad pathway by BMP2 and BMP4 was demonstrated. BMP2 and BMP4-initiated Smad signaling in cells derived from embryonic orofacial tissue was found to result in: (1) phosphorylation of Smads 1 and 5; (2) nuclear translocation of Smads 1, 4, and 5; (3) binding of Smads 1, 4, and 5 to a consensus Smad binding element (SBE)-containing oligonucleotide; (4) transactivation of transfected reporter constructs, containing BMP-inducible Smad response elements; and (5) increased expression at transcriptional as well as translational levels of Id3 (endogenous gene containing BMP receptor-specific Smad response elements). Collectively, these data document the existence of a functional Smad-mediated BMP signaling system in cells of the developing murine orofacial region.
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Affiliation(s)
- Partha Mukhopadhyay
- Department of Molecular, Cellular and Craniofacial Biology, University of Louisville Birth Defects Center, ULSD, University of Louisville, Louisville, Kentucky 40292, USA.
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21
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Etiopathogenesis of Lip, Alveolar Process and Palate Clefts. POLISH JOURNAL OF SURGERY 2008. [DOI: 10.2478/v10035-008-0077-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Mukhopadhyay P, Greene RM, Pisano MM. Expression profiling of transforming growth factor beta superfamily genes in developing orofacial tissue. BIRTH DEFECTS RESEARCH. PART A, CLINICAL AND MOLECULAR TERATOLOGY 2006; 76:528-43. [PMID: 16933306 PMCID: PMC2975040 DOI: 10.1002/bdra.20276] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Numerous signaling molecules have been shown to participate in the dynamic process of orofacial development. Among these signal mediators, members of the transforming growth factor beta (TGFbeta) superfamily have been shown to play critical roles. Developing orofacial tissue expresses TGFbeta and bone morphogenetic protein (BMP) mRNAs, their protein isoforms and TGFbeta- and BMP-specific receptors. All these molecules display unique temporospatial patterns of expression in embryonic orofacial tissue, suggesting functional roles in orofacial development. For example, the TGFbetas and BMPs regulate maxillary mesenchymal cell proliferation and extracellular matrix synthesis. This is particularly noteworthy in that perturbation of either process results in orofacial clefting. Although the cellular and phenotypic effects of the TGFbeta superfamily of growth factors on embryonic orofacial tissue have been extensively studied, the specific genes that function as effectors of these cytokines in orofacial development have not been well defined. METHODS In the present study, oligonucleotide-based microarray technology was utilized to provide a comprehensive analysis of the expression of the panoply of genes related to the TGFbeta superfamily, as well as those encoding diverse groups of proteins functionally associated with this superfamily, during orofacial ontogenesis. RESULTS Of the 7000 genes whose expression was detected in the developing orofacial region, 249 have been identified that encode proteins related to the TGFbeta superfamily. Expression of some (27) of these genes was temporally regulated. In addition, several candidate genes, whose precise role in orofacial development is still unknown, were also identified. Examples of genes constituting this cluster include: TGFbeta1-induced antiapoptotic factor-1 and -2, TGFbeta-induced factor 2, TGFbeta1 induced transcript-1 and -4, TGFbeta-inducible early growth response 1, follistatin-like 1, follistatin-like 3, transmembrane protein with EGF-like and two follistatin-like domains (Tmeff)-1 and -2, nodal modulator 1, various isoforms of signal transducers and activators of transcription (Stat), notch, and growth and differentiation factors. CONCLUSIONS Elucidation of the precise physiological roles of these proteins in orofacial ontogenesis should provide unique insights into the intricacies of the TGFbeta superfamily signal transduction pathways utilized during orofacial development.
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Affiliation(s)
- Partha Mukhopadhyay
- University of Louisville Birth Defects Center, Department of Molecular, Cellular and Craniofacial Biology, Louisville, Kentucky 40292, USA.
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Mukhopadhyay P, Singh S, Greene RM, Pisano MM. Molecular fingerprinting of BMP2- and BMP4-treated embryonic maxillary mesenchymal cells. Orthod Craniofac Res 2006; 9:93-110. [PMID: 16764684 DOI: 10.1111/j.1601-6343.2006.00356.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To determine the differences in gene expression between control-, bone morphogenetic protein (BMP)2- and BMP4-treated murine embryonic maxillary mesenchymal (MEMM) cells. DESIGN Transcript profiles of BMP2-, BMP4- and vehicle-treated MEMM cells were compared utilizing the murine high-density GeneChip arrays from Affymetrix. The raw chip data (probe intensities) were pre-processed using robust multichip averaging with GC-content background correction and further normalized with GeneSpring v7.2 software. Cluster analysis of the microarray data was performed with the GeneSpring software. Changes in the gene expression were verified by TaqMan quantitative real-time PCR. RESULTS Expression of approximately 50% of the 45 101 genes and expressed sequence tags examined in this study were detected in BMP2-, BMP4- and vehicle-treated MEMM cells and that of several hundred genes was significantly altered (up or downregulated) in these cells in response to BMP2 and BMP4. Expression profiles of each of the 26 mRNAs tested by TaqMan quantitative real-time PCR were found to be consistent with the microarray data. Genes whose expression was modulated following BMP2 or BMP4 treatment, could be broadly classified based on the functions of the encoded proteins such as the growth factors and signaling molecules, transcription factors, and proteins involved in epithelial-mesenchymal interactions, extracellular matrix synthesis, cell adhesion, proliferation, differentiation, and apoptosis. CONCLUSION Utilization of the Affymetrix GeneChip microarray technology has enabled us to delineate a detailed transcriptional map of BMP2 and BMP4 responsiveness in embryonic maxillary mesenchymal cells and offers revealing insights into crucial molecular regulatory mechanisms employed by these two growth factors in orchestrating embryonic orofacial cellular responses.
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Affiliation(s)
- P Mukhopadhyay
- Department of Molecular Cellular and Craniofacial Biology, University of Louisville Birth Defects Center, ULSD, University of Louisville, KY 40292, USA
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Nadiri A, Kuchler-Bopp S, Perrin-Schmitt F, Lesot H. Expression patterns of BMPRs in the developing mouse molar. Cell Tissue Res 2006; 324:33-40. [PMID: 16432712 DOI: 10.1007/s00441-005-0120-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2005] [Accepted: 11/04/2005] [Indexed: 11/30/2022]
Abstract
During development, Bone Morphogenetic Proteins (BMPs) can induce apoptosis, cell growth or differentiation. These different effects are mediated by dimers of two types of BMP-receptors (BMPRs). To identify the responding cells during tooth development and search for possible tissue-or stage-specificities in the receptors involved, the distribution patterns of BMPR-IA, -IB and -II were investigated in the mouse molar, from bud to bell stage. At the bud stage, BMP-2 was suggested to be involved in the formation of an epithelial signaling center, the primary enamel knot (PEK), while BMP-4 would mediate the condensation of the mesenchyme. Immunostaining showed the presence of BMPR-IA and -II in the epithelium instead of BMPR-IB and -II in the mesenchyme. At the cap stage, BMPR-IB was detected in the epithelium but not BMPR-II, suggesting the existence of another type II receptor to form a functional dimer. At the late cap stage in the epithelium, BMP-4, BMPR-IA and -II were restricted to the internal part of the PEK and the stalk: two apoptotic areas. The three proteins were detected in the mesenchyme, showing a strong staining where cusps were about to form. At the late bell stage, BMP-2 or -4 may induce cell differentiation. BMPR-IB and -II were detected in odontoblasts instead of BMPR-IA and -II in ameloblasts. These results provide the first evidence of multiple type I and type II BMP-receptors, expressed in the dental epithelium and mesenchyme at different stages of development, to signal different cellular activities in a time- and tissue-specific way.
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Affiliation(s)
- A Nadiri
- INSERM UMR S595, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 67085, Strasbourg, France.
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Cowan CM, Cheng S, Ting K, Soo C, Walder B, Wu B, Kuroda S, Zhang X. Nell-1 induced bone formation within the distracted intermaxillary suture. Bone 2006; 38:48-58. [PMID: 16243593 DOI: 10.1016/j.bone.2005.06.023] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2005] [Revised: 06/27/2005] [Accepted: 06/30/2005] [Indexed: 01/09/2023]
Abstract
Maxillary bone deficiencies, such as cleft palate and underdeveloped maxilla that require bone graft or regeneration after orthopedic or surgical expansion, pose a significant biomedical burden. Nell-1 is a secreted molecule that possesses chordin-like domains and induces cranial suture bone growth and osteoblast differentiation. To accelerate bone formation in acutely distracted palatal sutures, rat organ cultures were stimulated with Nell-1 or BMP-7 for 8 days in vitro. We hypothesized that Nell-1 stimulation to the distracted palatal suture would accelerate bone formation. Distracted palates of 4-week-old male rats were maintained in an organ culture system, and tissue was either unstimulated or stimulated with Nell-1 or BMP-7 for 8 days. MicroCT was conducted to quantitate bone formation, while alcian blue staining was conducted for cartilage localization. Immunohistochemistry of Sox9 for chondrocyte proliferation, type X collagen for hypertrophic cartilage in endochondral bone formation, and bone sialoprotein for bone formation was conducted to characterize the cellular mechanism of newly developed tissues. Distracted palates cultured in the presence of Nell-1 or BMP-7 produced statistically significantly (P < 0.05) more bone and cartilage within the intermaxillary suture, relative to unstimulated control samples. While both BMP-7 and Nell-1 induced similar bone formation in the distracted suture, BMP-7 induced both chondrocyte proliferation and differentiation, while Nell-1 accelerated chondrocyte hypertrophy and endochondral bone formation. While both Nell-1 and BMP-7 are effective in forming bone in the distracted palatal suture, they are suggested to have distinctively different mechanisms. The ability of Nell-1 to accelerate bone formation within the palate suture demonstrates the versatility of Nell-1 within the craniofacial complex as well as an exciting advance in palate suture defect healing.
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Affiliation(s)
- Catherine M Cowan
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA
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Yamada T, Fujiwara K, Mishima K, Sugahara T. Effect of ENU (ethylnitrosourea) mutagenesis in cleft lip and/or palate pathogenesis in mice. Int J Oral Maxillofac Surg 2005; 34:74-7. [PMID: 15617970 DOI: 10.1016/j.ijom.2004.03.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/24/2004] [Indexed: 11/17/2022]
Abstract
Cleft lip and/or palate (CL/P) are caused by many factors. The aim of this study was to investigate the effects of genetic point mutations in CL/P pathogenesis. ICR and AJ strain mice were used. Ethylnitrosourea (ENU) was injected into 10-week-old male mice (G0) intraperitoneally at a dose of 250 mg/kg. The males were bred with two untreated virgin females of the same strain on day 100 after injection. The uterine contents (G1) of one female were examined on day 18.5 of pregnancy. From the other female, the offspring were delivered naturally, and F3 mice (G3) were also examined in the same way. In ICR strain mice, cleft palate only (CPO) was increased in both the G1 and G3. The frequency was significantly higher in the G3 than the G1 generation. Cleft lip was not observed. In AJ strain mice, CL/P increased in both the G1 and G3. In the G3, the frequency of CPO was increased significantly. Genes related to CPO may be recessive in phenotype. CPO and cleft lip differ from a genetic viewpoint. Point mutations play a significant role in cleft lip and palate.
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Affiliation(s)
- T Yamada
- Department of Oral and Maxillofacial Reconstructive Surgery, Okayama University Graduate School of Medicine and Dentistry, Shikata-cho 2-5-1, 700-8525 Okayama, Japan.
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Pisano MM, Mukhopadhyay P, Greene RM. Molecular fingerprinting of TGFß-treated embryonic maxillary mesenchymal cells. Orthod Craniofac Res 2003; 6:194-209. [PMID: 14606523 DOI: 10.1034/j.1600-0544.2003.00264.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The transforming growth factor-beta (TGF(beta)) family represents a class of signaling molecules that plays a central role in normal embryonic development, specifically in development of the craniofacial region. Members of this family are vital to development of the secondary palate where they regulate maxillary and palate mesenchymal cell proliferation and extracellular matrix synthesis. The function of this growth factor family is particularly critical in that perturbation of either process results in a cleft of the palate. While the cellular and phenotypic effects of TGF(beta) on embryonic craniofacial tissue have been extensively cataloged, the specific genes that function as downstream mediators of TGF(beta) in maxillary/palatal development are poorly defined. Gene expression arrays offer the ability to conduct a rapid, simultaneous assessment of hundreds to thousands of differentially expressed genes in a single study. Inasmuch as the downstream sequelae of TGF(beta) action are only partially defined, a complementary DNA (cDNA) expression array technology (Clontech's Atlas Mouse cDNA Expression Arrays), was utilized to delineate a profile of differentially expressed genes from TGF(beta)-treated primary cultures of murine embryonic maxillary mesenchymal cells. Hybridization of a membrane-based cDNA array (1178 genes) was performed with 32P-labeled cDNA probes synthesized from RNA isolated from either TGF(beta)-treated or vehicle-treated embryonic maxillary mesenchymal cells. Resultant phosphorimages were subject to AtlasImage analysis in order to determine differences in gene expression between control and TGF(beta)-treated maxillary mesenchymal cells. Of the 1178 arrayed genes, 552 (47%) demonstrated detectable levels of expression. Steady state levels of 22 genes were up-regulated, while those of 8 other genes were down-regulated, by a factor of twofold or greater in response to TGF(beta). Affected genes could be grouped into three general functional categories: transcription factors and general DNA-binding proteins; growth factors/signaling molecules; and extracellular matrix and related proteins. The extent of hybridization of each gene was evaluated by comparison with the abundant, constitutively expressed mRNAs: ubiquitin, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), ornithine decarboxylase (ODC), cytoplasmic beta-actin and 40S ribosomal protein. No detectable changes were observed in the expression levels of these genes in-response to TGF(beta) treatment. Gene expression profiling results were verified by Real-Time quantitative polymerase chain reaction. Utilization of cDNA microarray technology has enabled us to delineate a preliminary transcriptional map of TGF(beta) responsiveness in embryonic maxillary mesenchymal cells. The profile of differentially expressed genes offers revealing insights into potential molecular regulatory mechanisms employed by TGF(beta) in orchestrating craniofacial ontogeny.
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Affiliation(s)
- M M Pisano
- Department of Molecular, Cellular and Craniofacial Biology, ULSD University of Louisville Birth Defects Center, Louisville, KY 40292, USA.
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Thyagarajan T, Totey S, Danton MJS, Kulkarni AB. Genetically altered mouse models: the good, the bad, and the ugly. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 2003; 14:154-74. [PMID: 12799320 DOI: 10.1177/154411130301400302] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Targeted gene disruption in mice is a powerful tool for generating murine models for human development and disease. While the human genome program has helped to generate numerous candidate genes, few genes have been characterized for their precise in vivo functions. Gene targeting has had an enormous impact on our ability to delineate the functional roles of these genes. Many gene knockout mouse models faithfully mimic the phenotypes of the human diseases. Because some models display an unexpected or no phenotype, controversy has arisen about the value of gene-targeting strategies. We argue in favor of gene-targeting strategies, provided they are used with caution, particularly in interpreting phenotypes in craniofacial and oral biology, where many genes have pleiotropic roles. The potential pitfalls are outweighed by the unique opportunities for developing and testing different therapeutic strategies before they are introduced into the clinic. In the future, we believe that genetically engineered animal models will be indispensable for gaining important insights into the molecular mechanisms underlying development, as well as disease pathogenesis, diagnosis, prevention, and treatment.
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Affiliation(s)
- Tamizchelvi Thyagarajan
- Functional Genomics Unit and Gene Targeting Facility, National Institute of Dental and Craniofacial Research, National Institutes of Health, Building 30, Room 527, 30 Convent Drive, Bethesda, MD 20892, USA
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Cuervo R, Valencia C, Chandraratna RAS, Covarrubias L. Programmed cell death is required for palate shelf fusion and is regulated by retinoic acid. Dev Biol 2002; 245:145-56. [PMID: 11969262 DOI: 10.1006/dbio.2002.0620] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The actual role of programmed cell death (PCD) in embryonic processes and the extrinsic signals that define the death fate in developing cells are still poorly understood. Here, we show that during secondary palate shelf fusion in the mouse, PCD appeared in the medial edge epithelia (MEE) of the anterior region only after shelf contact. Contact was necessary for efficient cell death activation in the MEE. However, exogenous all-trans-retinoic acid (RA) increased cell death independently of contact. Competence to induce cell death by contact or by RA exposure was obtained when the MEE were close to touch. Endogenous RA is a relevant regulator of the secondary palate PCD since this was reduced by a retinol dehydrogenase inhibitor and an RAR specific antagonist. Bmp-7 expression was positively regulated by RA. However, BMP-7 was unable to activate cell death within the palate tissue and NOGGIN, a natural BMP antagonist, did not block PCD. Reduction of PCD at the MEE directly with a caspase inhibitor or by inhibiting retinol dehydrogenase resulted in unfused palate shelves, but adhesion was not affected. In contrast, exogenous RA also blocked fusion, but in this situation the increased cell death within the MEE appeared to affect adhesion, thereby causing cleft palate in vivo.
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Affiliation(s)
- Rodrigo Cuervo
- Departamento de Genética y Fisiología Molecular, Instituto de Biotecnología, Cuernavaca, Morelos 62210, México
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