1
|
Conventional Ameloblastoma. A Case Report with Microarray and Bioinformatic Analysis. Diagnostics (Basel) 2022; 12:diagnostics12123190. [PMID: 36553196 PMCID: PMC9777305 DOI: 10.3390/diagnostics12123190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/08/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
Ameloblastoma is a rare benign epithelial odontogenic neoplasm, but with great clinical implications, as despite its benignity and slow growth, most cases are locally aggressive with a significant recurrence rate. Histological, cellular, or molecular analyses of its pathogenesis have confirmed the complexity of this neoplasm. We present the case of a 20-year-old patient with a suggestive clinical and radiographic diagnosis of ameloblastoma. An incisional biopsy was obtained confirming the diagnosis of conventional ameloblastoma. Left hemimandibulectomy and plate reconstruction were performed. Histopathological analysis of the surgical specimen confirmed the conventional ameloblastoma with a plexiform pattern and significant areas of cystic degeneration and amyloid-like-like deposits. Additionally, a microarray was carried out with bioinformatic analysis for the enrichment, protein interaction, and determination of eight hub genes (CRP, BCHE, APP, AKT1, AGT, ACTC1, ADAM10, and APOA2) related to their pathogenesis.
Collapse
|
2
|
Suppression of osteoclastogenesis signalling pathways and attenuation of ameloblastic osteolysis induced by local administration of CaP-bisphosphonate and CaP-doxycycline cements: Review of the literature and therapeutic hypothesis. ADVANCES IN ORAL AND MAXILLOFACIAL SURGERY 2022. [DOI: 10.1016/j.adoms.2021.100241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
3
|
Kim HY, Li S, Lee DJ, Park JH, Muramatsu T, Harada H, Jung YS, Jung HS. Activation of Wnt signalling reduces the population of cancer stem cells in ameloblastoma. Cell Prolif 2021; 54:e13073. [PMID: 34096124 PMCID: PMC8249789 DOI: 10.1111/cpr.13073] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 05/10/2021] [Accepted: 05/13/2021] [Indexed: 02/07/2023] Open
Abstract
Objectives The treatment of ameloblastoma, an odontogenic epithelial tumour destroying jawbone, mainly depends on radical destructive resections. Other therapeutic options are limited by the characteristics of ameloblastoma, such as high recurrence rates and resistance to radiation and chemotherapy, which implies possible existence of cancer stem cells (CSCs) in ameloblastoma. Here, we identified a putative CSC population in immortalized and primary human ameloblastoma cells and examined possible therapeutic reagents to reduce the CSC population. Methods We investigated subpopulations of AM‐1 cell line and human ameloblastoma cells using immunocytochemistry and flow cytometry and the effects of Wnt signalling activators on the 2‐ and 3‐dimensional cultured ameloblastoma cells using molecular biological analyses. Result Among heterogenous ameloblastoma cells, small‐sized and round‐shaped cells were found to be proliferative and expressed a marker of dental epithelial stem cells, SRY‐box 2 (Sox2). Exogenous activation of Wnt signalling using glycogen synthase kinase 3β inhibitors, lithium chloride (LiCl) and valproic acid (VPA), increased the cell size and decreased proliferation of cells and expression of Sox2 in 2 dimensionally cultured AM‐1 and human primary ameloblastoma cells. Furthermore, the growth of 3 dimensionally cultured AM‐1 cells as suspended or embedded in gel was suppressed by treatment with Wnt signalling activators, VPA and CHIR99021, or antibodies to sclerostin, an antagonist of Wnt signalling. Conclusion We suggest that Wnt signalling activators are potential drug candidates to suppress CSCs in ameloblastoma.
Collapse
Affiliation(s)
- Hyun-Yi Kim
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Oral Science Research Center, BK21 FOUR Project, Yonsei University College of Dentistry, Seoul, Korea
| | - Shujin Li
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Oral Science Research Center, BK21 FOUR Project, Yonsei University College of Dentistry, Seoul, Korea
| | - Dong-Joon Lee
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Oral Science Research Center, BK21 FOUR Project, Yonsei University College of Dentistry, Seoul, Korea
| | - Jin Hoo Park
- Department of Oral & Maxillofacial Surgery, Yonsei University, College of Dentistry, Seoul, Korea
| | - Takashi Muramatsu
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College, Tokyo, Japan
| | - Hidemitsu Harada
- Division of Developmental Biology and Regenerative Medicine, Department of Anatomy, Iwate Medical University, Iwate, Japan
| | - Young-Soo Jung
- Department of Oral & Maxillofacial Surgery, Yonsei University, College of Dentistry, Seoul, Korea
| | - Han-Sung Jung
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Oral Science Research Center, BK21 FOUR Project, Yonsei University College of Dentistry, Seoul, Korea
| |
Collapse
|
4
|
Sivakumar M, Yoithapprabhunath TR, Nirmal RM, Veeravarmal V, Dineshshankar J, Amsaveni R. Immunohistochemical analysis of Nuclear Factor-kappa B (NF-κB) between follicular and plexiform ameloblastomas: A pilot study. J Oral Maxillofac Pathol 2021; 24:466-471. [PMID: 33967482 PMCID: PMC8083443 DOI: 10.4103/jomfp.jomfp_150_20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 08/13/2020] [Accepted: 09/04/2020] [Indexed: 12/04/2022] Open
Abstract
Background: Ameloblastoma among benign tumors holds a unique position by its locally destructive and invasive nature. Tumors that originate from the odontogenic apparatus or its remnants in the jaws show diverse clinical presentations, behavior and histologic patterns. The differed biological behavior behind follicular and plexiform ameloblastomas has never attained completeness because of the lack of rhythmic correlation regarding the exact mechanism. Nuclear factor-kappa B (NF-κB) pathways play a crucial role in survival, death and differentiation during physiologic and pathologic conditions. With this background, the study has been aimed to investigate the expression of NF-κB in follicular and plexiform ameloblastomas. Objective: The objective of this study was to analyze the immunohistochemical expression pattern of NF-κB in ameloblastoma and to compare the immunohistochemical expression pattern of NF-κB among the histological types of ameloblastoma, follicular and plexiform patterns. Methodology: Total 20 ameloblastomas (10 follicular, 10 plexiform) were immunostained with antihuman NF-κB p65 mouse IgG monoclonal antibody, and the pattern of staining is statistically analyzed using Chi-square test with the level of significance (P < 0.05). Results: Twelve (3 follicular, 9 plexiform) out of 20 ameloblastomas showed immunoreactivity to NF-κB p65. In ameloblastoma, only the peripheral preameloblast-like tall columnar cells showed reactivity, whereas the stellate reticulum-like cells are immunonegative. The staining pattern was membranous in the immunoreactive cells. The results were studied with the associated and inducing pathways from the literature, and a possible mechanism has been proposed. Conclusion: The expression pattern of NF-κB was found to be higher in plexiform ameloblastoma than follicular ameloblastoma.
Collapse
Affiliation(s)
- Muniapillai Sivakumar
- Department of Oral and Maxillofacial Pathology, Madha Dental College and Hospital, Chennai, Tamil Nadu, India
| | | | - Ramadas Madhavan Nirmal
- Department of Oral and Maxillofacial Pathology, Rajah Muthiah Dental College and Hospital, Chidambaram, Tamil Nadu, India
| | - Veeran Veeravarmal
- Department of Oral and Maxillofacial Pathology, Rajah Muthiah Dental College and Hospital, Chidambaram, Tamil Nadu, India
| | - Janardhanam Dineshshankar
- Department of Oral and Maxillofacial Pathology, Vivekanandha Dental College for Women, Namakkal, Tamil Nadu, India
| | - Ramamoorthy Amsaveni
- Department of Oral and Maxillofacial Pathology, Rajah Muthiah Dental College and Hospital, Chidambaram, Tamil Nadu, India
| |
Collapse
|
5
|
Ishikawa T, Terashima J, Shimoyama Y, Ohashi Y, Mikami T, Takeda Y, Sasaki M. Effects of butyric acid, a bacterial metabolite, on the migration of ameloblastoma mediated by laminin 332. J Oral Sci 2020; 62:435-438. [PMID: 32879156 DOI: 10.2334/josnusd.19-0380] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Ameloblastoma is a benign tumor that develops in the jawbone. Occasionally, however, it may become malignant and metastasize to other tissues. Although it has been suggested that various cytokines and several adhesion factors may play a role in its malignant transformation, the details have not been elucidated. In this context, it has been reported that butyric acid produced by periodontopathic bacteria causes progression of malignant tumors occurring in the mouth via podoplanin. However, the influence of butyric acid on ameloblastoma has not been clarified. In the present study, therefore, the expression of various cytokines and adhesion factors in ameloblastoma upon stimulation with butyric acid or cytokines was investigated using real-time reverse-transcription polymerase chain reaction. Three cell lines (HAM1, HAM2 and HAM3) established from the same ameloblastoma were used in the experiments. It was found that the expression of mRNAs for epidermal growth factor (EGF) and transforming growth factor beta 1 (TGFβ1) was increased in HAM2 and HAM3, respectively, upon stimulation with butyric acid. In addition, stimulation with EGF and TGFβ1 led to an increase in the expression of laminin β-3 mRNA in the respective cell lines. These results suggest that butyric acid may be involved in ameloblastoma exacerbation through the expression of laminin 332 (LM332) via EGF and TGFβ1 produced by ameloblastoma itself.
Collapse
Affiliation(s)
- Taichi Ishikawa
- Division of Molecular Microbiology, Department of Microbiology, Iwate Medical University
| | - Jun Terashima
- Division of Pharmacodynamics and Molecular Genetics, School of Pharmacy, Iwate Medical University
| | - Yu Shimoyama
- Division of Molecular Microbiology, Department of Microbiology, Iwate Medical University
| | - Yu Ohashi
- Division of Oral and Maxillofacial Surgery, Department of Reconstructive Oral and Maxillofacial Surgery, School of Dentistry, Iwate Medical University
| | | | - Yasunori Takeda
- Division of Clinical Pathology, Department of Oral and Maxillofacial Reconstructive Surgery, School of Dentistry, Iwate Medical University
| | - Minoru Sasaki
- Division of Molecular Microbiology, Department of Microbiology, Iwate Medical University
| |
Collapse
|
6
|
You Z, Liu SP, Du J, Wu YH, Zhang SZ. Advancements in MAPK signaling pathways and MAPK-targeted therapies for ameloblastoma: A review. J Oral Pathol Med 2019; 48:201-205. [PMID: 30489659 DOI: 10.1111/jop.12807] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 11/14/2018] [Accepted: 11/22/2018] [Indexed: 12/12/2022]
Abstract
Numerous signal transduction pathways are closely associated with the occurrence, development, and prognosis of ameloblastoma (AM). Mitogen-activated protein kinase (MAPK) is a serine/threonine-specific protein kinase that transduces intracellular signals in critical cellular phenomena. A number of recent analyses have reported that the MAPK signaling pathway contributes significantly to AM. High-throughput DNA sequencing methods, such as next-generation sequencing using Illumina have yielded advancements in studies on MAPK signaling pathways and their association with AM; in particular, BRAF V600E is mediated by the activation of the Ras/Raf/MAPK pathway. This review discusses advancements in studies on MAPK signaling pathways and MAPK-targeted inhibitors or antibodies, along with the merits and demerits of MAPK-targeted therapies, finally followed by a discussion regarding more efficient potential MAPK-targeted therapies to treat AM with few side effects, thereby providing novel insights into targeted therapy for AM.
Collapse
Affiliation(s)
- Zhu You
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, Shandong Province, China.,Department of Oral and Maxillofacial Surgery, School of Stomatology, Shandong University, Jinan, Shandong Province, China.,Department of Oral and Maxillofacial Surgery, Shandong Provincial Hospital, Affiliated to Shandong University, Jinan, Shandong, China
| | - Shao-Peng Liu
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, Shandong Province, China.,Department of Oral and Maxillofacial Surgery, School of Stomatology, Shandong University, Jinan, Shandong Province, China
| | - Jing Du
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, Shandong Province, China.,Department of Endodontics, School of Stomatology, Shandong University, Jinan, Shandong Province, China
| | - Yi-Hua Wu
- Department of Periodontology, Shandong Provincial Hospital, Affiliated to Shandong University, Jinan, Shandong, China
| | - Shi-Zhou Zhang
- Department of Oral and Maxillofacial Surgery, Shandong Provincial Hospital, Affiliated to Shandong University, Jinan, Shandong, China
| |
Collapse
|
7
|
Zeballos R, Bologna-Molina R, Pereira-Prado V, Villarroel-Dorrego M. Expression of parathyroid hormone related protein (PTHRP) in ameloblastomas. J Clin Exp Dent 2018; 10:e172-e176. [PMID: 29670736 PMCID: PMC5899800 DOI: 10.4317/jced.54222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 01/03/2018] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Presence of parathyroid hormone related protein (PTHrP) might suggest that ameloblastomas recapitulate features of the enamel epithelium and induce bone resorption, which would facilitate their growth and local invasion. The aim of this study was to determine the expression of PTHrP in ameloblastomas. MATERIAL AND METHODS An observational research study was designed including 39 cases of histologically diagnosed ameloblastomas (39 out of 42 patients gave consent for the use of their medical records and all data required for this study). Gender, age, tumor location, histological type and subtype of the tumor were recorded and PTHrP expression was determined by indirect immunohistochemistry using monoclonal anti-human PTHrP (1D1 / Santa Cruz Biotechnology). Protein expression and intensity were evaluated under light microscope and finally data recorded and statistically analyzed. This research was approved by the Caracas West General Hospital review board. RESULTS 39 cases of ameloblastomas were evenly distributed between genders (49% male and 51% female) with a mean age of 33 ± 3.53 years, mainly affecting the posterior mandible. 20 cases (51.28%) showed positive cytoplasmic immunoreactivity to PTHrP. 8 out of 15 cases of solid/multicystic ameloblastomas and 12 out of 23 cases of unicystic ameloblastomas were PTHrP positive. Intense expression of PTHrP was observed in 4 unicystic ameloblastomas (all luminal subtype) and in 5 cases of conventional ameloblastomas. CONCLUSIONS In the present study PTHrP expression in solid multicystic and unicystic ameloblastoma suggests its possible function in the biological behavior of the tumor. More studies are needed in order to determine the possible role of this protein related to bone invasion processes. Key words:Parathyroid hormone related protein, PTHrP, ameloblastoma, bone.
Collapse
Affiliation(s)
| | - Ronell Bologna-Molina
- Molecular Pathology Area, Faculty of Dentistry, Universidad de la República, Uruguay
| | - Vanesa Pereira-Prado
- Molecular Pathology Area, Faculty of Dentistry, Universidad de la República, Uruguay
| | | |
Collapse
|
8
|
Ohta K, Naruse T, Ishida Y, Shigeishi H, Nakagawa T, Fukui A, Nishi H, Sasaki K, Ogawa I, Takechi M. TNF-α-induced IL-6 and MMP-9 expression in immortalized ameloblastoma cell line established by hTERT. Oral Dis 2016; 23:199-209. [PMID: 27868311 DOI: 10.1111/odi.12594] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 09/27/2016] [Accepted: 10/04/2016] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Ameloblastoma (AM) shows locally invasive behaviour. However, biological investigations regarding regulation of gene expression associated with AM pathological features are difficult to perform, because AM cells can be passaged for a few generations due to senescence. We report a newly established immortalized AM cell line, AMB cells, by transfection with human telomerase reverse transcriptase (hTERT). Furthermore, we examined whether TNF-α modulates bone resorption-related genes, IL-6 and MMP-9 in cooperation with TGF-β or IFN-γ. MATERIALS AND METHODS Following transfection of an hTERT expression vector into AM cells using a non-viral method, the effects of cytokines on the expressions of IL-6 and MMP-9 mRNA were examined using real-time PCR. TNF-α-induced NF-κB activity was examined by western blotting and transcription factor assays. RESULTS AMB cells continued to grow for more than 100 population doublings. Stimulation with TNF-α increased IL-6 and MMP-9 mRNA expressions, as well as NF-κB activation. Furthermore, TGF-β and IFN-γ dramatically increased TNF-α-mediated expressions of MMP-9 and IL-6 mRNA, respectively, while those responses were suppressed by NF-κB inhibitor. CONCLUSION We established an immortalized AM cell line by hTERT transfection. TNF-α-mediated regulation of MMP-9 and IL-6 via NF-κB may play an important role in the pathological behaviour of AMs, such as bone resorption.
Collapse
Affiliation(s)
- K Ohta
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - T Naruse
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Ishida
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - H Shigeishi
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - T Nakagawa
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - A Fukui
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - H Nishi
- Department General Dentistry, Hiroshima University Hospital, Hiroshima, Japan
| | - K Sasaki
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| | - I Ogawa
- Center of Oral Clinical Examination, Hiroshima University Hospital, Hiroshima, Japan
| | - M Takechi
- Department of Oral and Maxillofacial Surgery, Division of Cervico-Gnathostmatology, Programs for Applied Biomedicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
| |
Collapse
|
9
|
Brown NA, Betz BL. Ameloblastoma: A Review of Recent Molecular Pathogenetic Discoveries. BIOMARKERS IN CANCER 2015; 7:19-24. [PMID: 26483612 PMCID: PMC4597444 DOI: 10.4137/bic.s29329] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 07/13/2015] [Accepted: 07/14/2015] [Indexed: 12/30/2022]
Abstract
Ameloblastoma is an odontogenic neoplasm whose molecular pathogenesis has only recently been elucidated. The discovery of recurrent activating mutations in FGFR2, BRAF, and RAS in a large majority of ameloblastomas has implicated dysregulation of MAPK pathway signaling as a critical step in the pathogenesis of this tumor. Some degree of controversy exists regarding the role of mutations affecting the sonic hedgehog (SHH) pathway, specifically Smoothened (SMO), which have been postulated to serve as either an alternative pathogenetic mechanism or secondary mutations. Here, we review recent advances in our understanding of the molecular pathogenesis of ameloblastoma as well as the diagnostic, prognostic, and therapeutic implications of these discoveries.
Collapse
Affiliation(s)
- Noah A Brown
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Bryan L Betz
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| |
Collapse
|
10
|
Brown NA, Rolland D, McHugh JB, Weigelin HC, Zhao L, Lim MS, Elenitoba-Johnson KSJ, Betz BL. Activating FGFR2-RAS-BRAF mutations in ameloblastoma. Clin Cancer Res 2014; 20:5517-26. [PMID: 24993163 DOI: 10.1158/1078-0432.ccr-14-1069] [Citation(s) in RCA: 179] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
PURPOSE Ameloblastoma is an odontogenic neoplasm whose overall mutational landscape has not been well characterized. We sought to characterize pathogenic mutations in ameloblastoma and their clinical and functional significance with an emphasis on the mitogen-activated protein kinase (MAPK) pathway. EXPERIMENTAL DESIGN A total of 84 ameloblastomas and 40 non-ameloblastoma odontogenic tumors were evaluated with a combination of BRAF V600E allele-specific PCR, VE1 immunohistochemistry, the Ion AmpliSeq Cancer Hotspot Panel, and Sanger sequencing. Efficacy of a BRAF inhibitor was evaluated in an ameloblastoma-derived cell line. RESULTS Somatic, activating, and mutually exclusive RAS-BRAF and FGFR2 mutations were identified in 88% of cases. Somatic mutations in SMO, CTNNB1, PIK3CA, and SMARCB1 were also identified. BRAF V600E was the most common mutation, found in 62% of ameloblastomas and in ameloblastic fibromas/fibrodentinomas but not in other odontogenic tumors. This mutation was associated with a younger age of onset, whereas BRAF wild-type cases arose more frequently in the maxilla and showed earlier recurrences. One hundred percent concordance was observed between VE1 immunohistochemistry and molecular detection of BRAF V600E mutations. Ameloblastoma cells demonstrated constitutive MAPK pathway activation in vitro. Proliferation and MAPK activation were potently inhibited by the BRAF inhibitor vemurafenib. CONCLUSIONS Our findings suggest that activating FGFR2-RAS-BRAF mutations play a critical role in the pathogenesis of most cases of ameloblastoma. Somatic mutations in SMO, CTNNB1, PIK3CA, and SMARCB1 may function as secondary mutations. BRAF V600E mutations have both diagnostic and prognostic implications. In vitro response of ameloblastoma to a BRAF inhibitor suggests a potential role for targeted therapy.
Collapse
Affiliation(s)
| | | | | | | | - Lili Zhao
- Biostatistics, University of Michigan, Ann Arbor, Michigan
| | | | | | | |
Collapse
|
11
|
Activation of the Akt/mTOR pathway in dentigerous cysts, odontogenic keratocysts, and ameloblastomas. Oral Surg Oral Med Oral Pathol Oral Radiol 2014; 116:336-42. [PMID: 23953418 DOI: 10.1016/j.oooo.2013.06.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 06/11/2013] [Accepted: 06/14/2013] [Indexed: 12/20/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the Akt/mTOR pathway in dentigerous cysts (DCs), odontogenic keratocysts (OKCs), and ameloblastomas. STUDY DESIGN A total of 90 cases were studied (30 DCs, 30 OKCs, and 30 ameloblastomas). Patient records on age, sex, lesion location, symptoms, and radiographic and histopathologic features were collected. The phosphorylation of components of the Akt/mTOR pathway [p-Akt (Ser473), p-Akt (Thr308), and phosphorylated-ribosomal protein S6 (p-RPS6)] was studied using immunohistochemistry. Correlations with clinical features were analyzed using the Spearman rank test. RESULTS Over 90% of OKCs and ameloblastomas and 60% of DCs stained positive for p-Akt (Ser473). Phospho-Akt (Thr308) was positive in 73% of ameloblastomas, 40% of OKCs, and 20% of DCs. Phospho-RPS6 was detected most frequently in OKCs (83%), followed by ameloblastomas (76%) and DCs (53%). No correlations were noted between the immunohistochemical findings and the clinicopathologic parameters. CONCLUSIONS The Akt/mTOR pathway is upregulated in DCs, OKCs, and ameloblastomas. This pathway may be involved in the development of these lesions.
Collapse
|
12
|
Host inflammatory response inhibits Escherichia coli O157:H7 adhesion to gut epithelium through augmentation of mucin expression. Infect Immun 2014; 82:1921-30. [PMID: 24566630 DOI: 10.1128/iai.01589-13] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Escherichia coli O157:H7, a major Shiga toxin-producing pathogen, has a low infectious dose and causes serious illness in humans. The gastrointestinal tract of cattle is the primary reservoir of E. coli O157:H7, and thus, it is critical to eliminate or reduce E. coli O157:H7 gut colonization. Given that E. coli O157:H7 produces effectors that attenuate inflammatory signaling, we hypothesized that the host inflammatory response acts to perturb E. coli O157:H7 intestinal colonization. Tumor necrosis factor alpha (TNF-α) treatment of HT-29 cells resulted in increased expression of inflammatory cytokine interleukin 1β (IL-1β), IL-8, and TNF-α genes and increased IL-8 protein and resulted in decreased adhesion of E. coli O157:H7. Similarly, E. coli O157:H7 adhesion to cattle colonic explants was reduced by TNF-α treatment. Irrespective of the presence of E. coli O157:H7, TNF-α enhanced activation of p65, the key mediator of NF-κB inflammatory signaling, whereas E. coli O157:H7 infection suppressed this pathway by inhibiting p65 activation in HT-29 cells. To further explore the mechanisms linking the inflammatory response to attenuated E. coli O157:H7 adhesion, mucin 2 (MUC2) expression was analyzed, considering that the intestinal mucus layer is the first defense against enteric pathogens and MUC2 is the major secretory mucin in the intestine. MUC2 expression in HT-29 cells was increased by TNF-α treatment and by E. coli O157:H7 infection. However, reducing mucin expression by blocking mitogen-activated protein kinase (MAPK) extracellular signal-regulated protein kinases 1/2 (ERK1/2) and/or phosphatidylinositol 3-kinase (PI3K)/Akt signaling increased E. coli O157:H7 adherence to HT-29 cells. These data suggest that the inflammatory cytokine response acts to protect host epithelial cells against E. coli O157:H7 colonization, at least in part, by promoting mucin production.
Collapse
|
13
|
Perng DW, Yang DM, Hsiao YH, Lo T, Lee OKS, Wu MT, Wu YC, Lee YC. miRNA-146a expression positively regulates tumor necrosis factor-α-induced interleukin-8 production in mesenchymal stem cells and differentiated lung epithelial-like cells. Tissue Eng Part A 2012; 18:2259-67. [PMID: 22876745 DOI: 10.1089/ten.tea.2011.0634] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Bone marrow-derived mesenchymal stem cells (BM-MSC) can be differentiated into lung epithelial-like cells (MSC-EC) in vitro. The response of BM-MSC and MSC-EC to stimuli may vary because of their character and differentiation. We aimed to investigate the factors that may influence in vitro differentiation of BM-MSC to MSC-EC. We determined the response of BM-MSC, MSC-EC, bronchial epithelial cells, and alveolar epithelial cells to tumor necrosis factor (TNF)-α stimulation. We also investigated the changes in micro(mi)RNA-146a, miRNA-155, and TNF receptor 1 (TNFR1) expression after stimulation. Our results demonstrate that the addition of transforming growth factor-β(1) and extracellular matrix collagen are required to facilitate such differentiation. After 3 weeks of culture, the morphological appearance and expression of airway epithelial markers, cytokeratin and Clara cell secretory protein, in MSC-EC were characteristics of lung epithelial cells. In response to TNF-α stimulation, the maximal interleukin (IL)-8 production by BM-MSC at the 24-h time point was 4.8 times greater compared with MSC-EC. TNF-α induced a significant increase in the expression of miRNA-146a in BM-MSC as compared with MSC-EC. miRNA-155 expression remained unchanged after stimulation. TNFR1 mRNA also significantly increased in BM-MSC after TNF-α stimulation. This was not observed in MSC-EC. Transfection with miRNA-146a mimics resulted in a significant increase of miRNA-146a expression and IL-8 production in both types of cells. In contrast, miRNA-146a inhibitors reduced miRNA-146a expression and IL-8 production. Overexpression of miRNA-146a, which positively regulates TNF-α-induced IL-8 release, may enhance the inflammatory response in both BM-MSC and MSC-EC. The expression of miRNA-146a and the response to stimuli may be modulated through mature differentiation of BM-MSC.
Collapse
Affiliation(s)
- Diahn-warng Perng
- Department of Chest Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.
| | | | | | | | | | | | | | | |
Collapse
|
14
|
DeVilliers P, Suggs C, Simmons D, Murrah V, Wright JT. Microgenomics of ameloblastoma. J Dent Res 2011; 90:463-9. [PMID: 21282726 DOI: 10.1177/0022034510391791] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Gene expression profiles of human ameloblastoma microdissected cells were characterized with the purpose of identifying genes and their protein products that could be targeted as diagnostic and prognostic markers as well as for potential therapeutic interventions. Five formalin-fixed, decalcified, paraffin-embedded samples of ameloblastoma were subjected to laser capture microdissection, linear mRNA amplification, and hybridization to oligonucleotide human 41,000 RNA arrays and compared with universal human reference RNA, to determine the gene expression signature. Assessment of the data by Significance Analysis of Microarrays (SAM) and cluster analysis showed that 38 genes were highly expressed (two-fold increase) in all samples, while 41 genes were underexpressed (two-fold reduction). Elements of the sonic hedgehog pathway and Wingless type MMTV integration site family were validated by immunohistochemistry. We have identified the expression of multiple genes and protein products that could serve as potential diagnostic, prognostic, and therapeutic targets.
Collapse
Affiliation(s)
- P DeVilliers
- Department of Pathology, University of Alabama at Birmingham, USA
| | | | | | | | | |
Collapse
|
15
|
Sauk JJ, Nikitakis NG, Scheper MA. Are we on the brink of nonsurgical treatment for ameloblastoma? ACTA ACUST UNITED AC 2010; 110:68-78. [DOI: 10.1016/j.tripleo.2010.01.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2009] [Revised: 01/06/2010] [Accepted: 01/26/2010] [Indexed: 12/17/2022]
|
16
|
An Anti-apoptotic Role of NF-κB in TNFα-induced Apoptosis in an Ameloblastoma Cell Line. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1348-8643(08)80013-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
17
|
Scheper MA, Chaisuparat R, Nikitakis NG, Sauk JJ. Expression and alterations of the PTEN / AKT / mTOR pathway in ameloblastomas. Oral Dis 2008; 14:561-8. [DOI: 10.1111/j.1601-0825.2007.01421.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
18
|
Kumamoto H, Ooya K. Immunohistochemical detection of phosphorylated Akt, PI3K, and PTEN in ameloblastic tumors. Oral Dis 2007; 13:461-7. [PMID: 17714348 DOI: 10.1111/j.1601-0825.2006.01321.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To evaluate roles of the Akt signaling pathway in oncogenesis and cytodifferentiation of odontogenic tumors, expression of phosphorylated Akt (pAkt), PI3K, and PTEN was analyzed in ameloblastic tumors as well as in tooth germs. METHODS 11 tooth germs, 40 ameloblastomas, and 5 malignant ameloblastic tumors were examined immunohistochemically with antibodies against pAkt, PI3K, and PTEN. RESULTS Immunoreactivity for pAkt, PI3K, and PTEN was detected predominantly in odontogenic epithelial cells near the basement membrane in tooth germs and ameloblastic tumors. The levels of immunoreactivity for pAkt and PI3K were slightly higher in ameloblastic tumors than in tooth germs. Plexiform ameloblastomas showed significantly higher expression of PI3K than follicular ameloblastomas, and PI3K immunoreactivity in ameloblastomas without cellular variation was significantly higher than that in acanthomatous ameloblastomas. The level of PTEN immunoreactivity was significantly lower in ameloblastomas than in tooth germs. CONCLUSION Expression of pAkt, PI3K, and PTEN in tooth germs and ameloblastic tumors suggests that these signaling molecules regulate cell survival and growth in normal and neoplastic odontogenic tissues by mediating growth factor signals. Increased expression of pAkt and PI3K and decreased expression of PTEN in ameloblastic tumors may participate in oncogenesis of odontogenic epithelium by activating the Akt signaling pathway.
Collapse
Affiliation(s)
- Hiroyuki Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan.
| | | |
Collapse
|
19
|
Sandra F, Hendarmin L, Nakamura S. Osteoprotegerin (OPG) binds with tumor necrosis factor-related apoptosis-inducing ligand (TRAIL): suppression of TRAIL-induced apoptosis in ameloblastomas. Oral Oncol 2006; 42:415-20. [PMID: 16413220 DOI: 10.1016/j.oraloncology.2005.09.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2005] [Revised: 09/16/2005] [Accepted: 09/20/2005] [Indexed: 12/31/2022]
Abstract
Osteoprotegerin (OPG) is a useful receptor in inhibiting Receptor Activator of NFkappaB Ligand (RANKL) in inducing osteoclastogenesis. Tumor Necrosis Factor (TNF)-Related Apoptosis-Inducing Ligand (TRAIL) is a potent apoptosis-inducing ligand in ameloblastomas. Since OPG has been reported to bind to TRAIL as well, the effect of OPG in TRAIL's function in inducing apoptosis should also be investigated. To investigate on the expression of OPG in ameloblastomas, immuhistochemistry, immunofluorescence and Western blot were performed. From the immunohistochemistry results, we found that OPG was expressed in ameloblastoma tissues. Expression of OPG was clearly seen in AM-1 cells by immunofluorescence as well. Additionally, Western blot analysis confirmed OPG expression in ameloblastoma tissues and AM-1 cells. To investigate on the potential of TNFalpha, TRAIL and RANKL in inducing apoptosis, we performed an apoptosis assay. From the apoptosis assay, we found that TRAIL had the highest potential in inducing apoptosis compared to TNFalpha and RANKL. To investigate the binding of OPG with RANKL and TRAIL, we performed a binding assay. We noticed that OPG preferably bind with RANKL than TRAIL. However, at low levels of RANKL, marked binding of OPG with TRAIL was seen. As we suspected that the binding of OPG and TRAIL might cause the effect of TRAIL in inducing apoptosis in ameloblastomas, we combined the treatment of OPG and TRAIL in AM-1 cells. From the apoptosis assay, we found that under treatment of OPG, TRAIL's function in inducing apoptosis was suppressed. These data suggest that by binding with TRAIL, OPG suppressed TRAIL's function in inducing apoptosis in ameloblastomas.
Collapse
Affiliation(s)
- Ferry Sandra
- Section of Oral and Maxillofacial Oncology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | | | | |
Collapse
|
20
|
Sandra F, Hendarmin L, Nakao Y, Nakamura N, Nakamura S. Inhibition of Akt and MAPK pathways elevated potential of TNFα in inducing apoptosis in ameloblastoma. Oral Oncol 2006; 42:39-45. [PMID: 16140562 DOI: 10.1016/j.oraloncology.2005.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2005] [Accepted: 04/13/2005] [Indexed: 11/27/2022]
Abstract
Tumor necrosis factor alpha (TNFalpha) can trigger both cell survival and apoptosis. In the present study, from the flow cytometry results, we found that the prolonged-treatment of TNFalpha until 24 h, resulted apoptosis in AM-1 cells (ameloblastoma cell line). These results were confirmed by DAPI staining, which showed nuclear fragmentation feature of AM-1 cells under treatment of TNFalpha. Our further investigation using specific caspase inhibitors showed that caspase-3 played a crucial role in mediating TNFalpha-induced apoptosis in AM-1 cells. In addition, significant elevation of TNFalpha potential in inducing apoptosis was seen by applying LY294002, phosphatidylinositol-3-OH kinase (PI3K) inhibitor, or U0126, mitogen-activated extracellular-regulated kinase (MEK1/2) inhibitor, prior to the treatment of TNFalpha in AM-1 cells. These results suggested that TNFalpha induced both cell survival and apoptosis pathways in ameloblastoma and potential of TNFalpha in inducing apoptosis can be improved by inhibiting TNFalpha-induced Akt and p44/42 mitogen-activated protein kinase (MAPK) cell survival pathways.
Collapse
Affiliation(s)
- Ferry Sandra
- Section of Oral and Maxillofacial Oncology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | | | | | | | | |
Collapse
|
21
|
Sandra F, Hendarmin L, Kukita T, Nakao Y, Nakamura N, Nakamura S. Ameloblastoma induces osteoclastogenesis: a possible role of ameloblastoma in expanding in the bone. Oral Oncol 2005; 41:637-44. [PMID: 15935726 DOI: 10.1016/j.oraloncology.2005.02.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2005] [Accepted: 02/11/2005] [Indexed: 10/25/2022]
Abstract
Ameloblastoma, a tumor located in bone, when neglected, can perforate the bone and, ultimately, spread into the soft tissues. To expand in the bone, ameloblastoma must have a mechanism of resorbing the surrounding bone. However, the mechanism for bone resorption is poorly understood. In the present study, we found that RANKL and TNFalpha were expressed and secreted by ameloblastoma cells, and was proven to induce osteoclastogenesis. Our present results also showed that phosphorylation of p38, SAPK, p44/42 and Akt were upregulated under treatment of 10xCM (concentrated conditioned media of AM-1 cells). We also noticed formation of resorption lacunae on dentin slice by 10xCM-induced osteoclast-like MNCs. These results suggested that ameloblastoma by secreting RANKL and TNFalpha could induce osteoclastogenesis.
Collapse
Affiliation(s)
- Ferry Sandra
- Laboratory of Oral Cellular and Molecular Biology, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.
| | | | | | | | | | | |
Collapse
|