1
|
Guimarães DM, Antunes DM, Duarte CME, Ferro LB, Nunes FD. DNA methyltransferase immunohistochemical expression in odontogenic tumours. J Oral Pathol Med 2015; 44:59-66. [PMID: 25060239 DOI: 10.1111/jop.12208] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/21/2014] [Indexed: 12/30/2022]
Abstract
BACKGROUND Odontogenic tumours are a heterogeneous group of lesions formed from tissues that give rise to the tooth. DNA methylation, a covalent addition of a methyl group to the 5-carbon position of a cytosine nucleotide, is considered an important regulator of gene expression. The addition of the methyl radical is catalysed by DNA methyltransferases (DNMTs). Although some epigenetic studies have been conducted in odontogenic tumours, a study with the three types of DNMTs in several different members of this group is missing. This study analyses the expression of DNMTs in odontogenic tumours. METHODS Formalin-fixed and paraffin-embedded tissue samples of 20 ameloblastomas, 10 calcifying cystic odontogenic tumours, 10 calcifying epithelial tumours, 10 adenomatoid odontogenic tumours, 10 keratocystic odontogenic tumours, five ameloblastic fibromas, two ameloblastic fibro-odontomas, four central odontogenic fibromas, seven peripheral odontogenic fibromas and 10 odontogenic myxomas were included. Immunohistochemical expression of DNMT1, 3A and 3B was assessed using a semi-quantitative analysis, and also a correlation with p21, p27 and E-cadherin immunoexpression was made. RESULTS DNMT1, 3A and 3B were expressed in the nucleus and/or cytoplasm of all odontogenic tumours. DNMT1 expression was directly correlated with p27 expression in ameloblastomas. CONCLUSION The high expression of DNMTs in odontogenic tumour cells suggests methylation as an important mechanism for this group of tumours.
Collapse
Affiliation(s)
- Douglas Magno Guimarães
- Department of Oral Pathology, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | | | | | | | | |
Collapse
|
2
|
Kurppa KJ, Catón J, Morgan PR, Ristimäki A, Ruhin B, Kellokoski J, Elenius K, Heikinheimo K. High frequency of BRAF V600E mutations in ameloblastoma. J Pathol 2014; 232:492-8. [PMID: 24374844 PMCID: PMC4255689 DOI: 10.1002/path.4317] [Citation(s) in RCA: 200] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 12/18/2013] [Accepted: 12/19/2013] [Indexed: 12/18/2022]
Abstract
Ameloblastoma is a benign but locally infiltrative odontogenic neoplasm. Although ameloblastomas rarely metastasise, recurrences together with radical surgery often result in facial deformity and significant morbidity. Development of non-invasive therapies has been precluded by a lack of understanding of the molecular background of ameloblastoma pathogenesis. When addressing the role of ERBB receptors as potential new targets for ameloblastoma, we discovered significant EGFR over-expression in clinical samples using real-time RT-PCR, but observed variable sensitivity of novel primary ameloblastoma cells to EGFR-targeted drugs in vitro. In the quest for mutations downstream of EGFR that could explain this apparent discrepancy, Sanger sequencing revealed an oncogenic BRAF V600E mutation in the cell line resistant to EGFR inhibition. Further analysis of the clinical samples by Sanger sequencing and BRAF V600E-specific immunohistochemistry demonstrated a high frequency of BRAF V600E mutations (15 of 24 samples, 63%). These data provide novel insight into the poorly understood molecular pathogenesis of ameloblastoma and offer a rationale to test drugs targeting EGFR or mutant BRAF as novel therapies for ameloblastoma.
Collapse
Affiliation(s)
- Kari J Kurppa
- Department of Medical Biochemistry and Genetics and MediCity Research Laboratories, University of TurkuFinland
- Turku Doctoral Programme of Molecular MedicineTurku, Finland
| | - Javier Catón
- Division of Clinical and Diagnostic Sciences, KCL Dental Institute, King's College LondonUK
| | - Peter R Morgan
- Division of Clinical and Diagnostic Sciences, KCL Dental Institute, King's College LondonUK
| | - Ari Ristimäki
- Division of Pathology and Genetics, HUSLAB, Helsinki University Central Hospital, and Department of Pathology, Haartman Institute and Genome-Scale Biology, Research Programs Unit, University of HelsinkiFinland
| | - Blandine Ruhin
- Assistance Publique-Hôpitaux de Paris, Maxillofacial and Stomatology Department, Pitié-Salpêtrière Hospital, and Molecular Oral Pathophysiology, INSERM UMRS 872, Cordeliers Biomedical Institute, Paris 7 UniversityFrance
| | - Jari Kellokoski
- Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Eastern Finland, and Department of Oral and Maxillofacial Diseases, Kuopio University HospitalFinland
| | - Klaus Elenius
- Department of Medical Biochemistry and Genetics and MediCity Research Laboratories, University of TurkuFinland
- Department of Oncology, Turku University HospitalFinland
- # These authors contributed equally to this study
| | - Kristiina Heikinheimo
- Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Turku and Turku University Hospital, Turku, and Department of Oral Diagnostic Sciences, Institute of Dentistry, University of Eastern FinlandKuopio, Finland
- *Correspondence to: K Heikinheimo, Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Turku, Lemminkäisenkatu 2, FI-20520 Turku, Finland. E-mail:
| |
Collapse
|
3
|
Abstract
BACKGROUND To evaluate roles of mitogen-activated protein kinases (MAPKs) in oncogenesis and cytodifferentiation of odontogenic tumors, expression of phosphorylated JNK (p-JNK), p38 MAPK (p-p38 MAPK), and ERK5 (p-ERK5) was analyzed in ameloblastic tumors as well as in tooth germs. METHODS Ten tooth germs, 47 ameloblastomas, and 5 malignant ameloblastic tumors were examined immunohistochemically with the antibodies against p-JNK, p-p38 MAPK, and p-ERK5. RESULTS Immunoreactivity for p-JNK was detected in epithelial or neoplastic cells detached from the basement membrane in 7 tooth germs and 7 ameloblastomas, and the expression levels of p-JNK in ameloblastic tumors were significantly lower than that in tooth germs. Expression of p-p38 MAPK was found in epithelial or neoplastic cells in tooth germs and ameloblastic tumors except for two ameloblastomas, and increased expression was found in keratinizing cells of acanthomatous ameloblastomas. The expression level of p-p38 MAPK in ameloblastomas was significantly higher than the levels in tooth germs and malignant ameloblastic tumors. Immunoreactivity for p-ERK5 was found predominantly in epithelial or neoplastic cells near the basement membrane in tooth germs and ameloblastic tumors. The expression levels of p-ERK5 in ameloblastic tumors were slightly higher than that in tooth germs, and plexiform ameloblastomas showed significantly higher p-ERK5 expression than follicular ameloblastomas. CONCLUSION Expression of p-JNK, p-p38 MAPK, and p-ERK5 in tooth germs and ameloblastic tumors suggests that these MAPK signaling pathways contribute to cell proliferation, differentiation, or apoptosis in both normal and neoplastic odontogenic tissues. Altered expression of these phosphorylated MAPKs in ameloblastic tumors may be involved in oncogenesis and tumor cell differentiation.
Collapse
Affiliation(s)
- H Kumamoto
- Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan.
| | | |
Collapse
|
4
|
Kumamoto H, Ooya K. Immunohistochemical detection of platelet-derived endothelial cell growth factor/thymidine phosphorylase and angiopoietins in ameloblastic tumors. J Oral Pathol Med 2006; 35:606-12. [PMID: 17032393 DOI: 10.1111/j.1600-0714.2006.00458.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND To evaluate the roles of angiogenic factors in the development and progression of odontogenic tumors, expression of platelet-derived endothelial cell growth factor/thymidine phosphorylase (PD-ECGF/TP) and of angiopoietins in ameloblastic tumors as well as in tooth germs. METHODS Tissue specimens of 11 tooth germs, 44 ameloblastomas, and five malignant ameloblastic tumors were examined immunohistochemically with the use of antibodies against PD-ECGF/TP and angiopoietin-1 and -2. RESULTS Immunohistochemical reactivity for PD-ECGF/TP was detected in mesenchymal cells in tooth germs and stromal cells in ameloblastic tumors, and the level of immunoreactivity for PD-ECGF/TP was significantly higher in ameloblastomas than in tooth germs. Granular cell ameloblastomas showed PD-ECGF/TP reactivity in granular neoplastic cells as well as in stromal cells. Immunoreactivity for angiopoietin-1 and -2 was detected predominantly in odontogenic epithelial cells near the basement membrane in tooth germs and in benign and malignant ameloblastic tumors. Malignant ameloblastic tumors had decreased angiopoietin-1 reactivity and ameloblastic carcinomas had increased angiopoietin-2 reactivity as compared with the respective levels in tooth germs and ameloblastomas. Immunohistochemical reactivity for angiopoietin-2 was slightly higher in follicular ameloblastomas than in plexiform ameloblastomas. CONCLUSION Expression of PD-ECGF/TP and angiopoietin-1 and -2 in tooth germs and ameloblastic tumors suggests that these angiogenic factors participate in tooth development and odontogenic tumor progression by regulating angiogenesis. Altered expression of PD-ECGF/TP and angiopoietins in ameloblastic tumors may be involved in oncogenesis, malignant potential, and tumor cell differentiation.
Collapse
Affiliation(s)
- Hiroyuki Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, Sendai, Japan.
| | | |
Collapse
|
5
|
Abstract
BACKGROUND To evaluate the roles of matrix-degrading proteinase regulators in progression of odontogenic tumors, expression of membrane-bound matrix metalloproteinase (MMP) MT1-MMP, MMP inhibitor RECK and MMP inducer EMMPRIN was analyzed in ameloblastic tumors as well as in tooth germs. METHODS Tissue specimens of 11 tooth germs, 40 ameloblastomas, and five malignant ameloblastic tumors were examined immunohistochemically with the use of antibodies against MT1-MMP, RECK, and EMMPRIN. RESULTS Immunohistochemical reactivity for MT1-MMP, RECK and EMMPRIN was detected predominantly in odontogenic epithelial cells near the basement membrane in tooth germs and benign and malignant ameloblastic tumors. The level of immunoreactivity for MT1-MMP was slightly higher in benign and malignant ameloblastic tumors than in tooth germs. RECK expression was lower in ameloblastomas than in tooth germs. Follicular ameloblastomas showed significantly lower expression of RECK than plexiform ameloblastomas, and immunoreactivity for RECK in acanthomatous ameloblastomas was slightly lower than that in other cellular variants. CONCLUSION Expression of MT1-MMP, RECK and EMMPRIN in tooth germs and ameloblastic tumors suggests that these normal and neoplastic epithelial components control MMP-dependent extracellular matrix (ECM) degradation during tooth development and tumor progression via epithelial-mesenchymal interactions.
Collapse
Affiliation(s)
- H Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
| | | |
Collapse
|
6
|
Nagatsuka H, Han PP, Tsujigiwa H, Siar CH, Gunduz M, Sugahara T, Sasaki A, Nakajima M, Naomoto Y, Nagai N. Heparanase gene and protein expression in ameloblastoma: possible role in local invasion of tumor cells. Oral Oncol 2005; 41:542-8. [PMID: 15878761 DOI: 10.1016/j.oraloncology.2005.01.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Accepted: 01/04/2005] [Indexed: 11/20/2022]
Abstract
Ameloblastoma is the most common odontogenic neoplasm, particularized by its local invasiveness. Heparanase is the endo-glucuronidase enzyme that specifically cleaves heparan sulfate, the important modulator of extracellular matrix, and related to invasion of tumor cells. In this study, we addressed to show the gene expression and localization of heparanase in ameloblastoma. Immunohistochemistry and in situ hybridization of heparanase were carried out in 23 ameloblastomas. Strong expression of heparanase at both mRNA and protein levels was detected in all ameloblastomas studied. Small tumor nests and budding epithelial branches showed stronger staining pattern and the stromal tissues at the immediate vicinity of the tumor nests with strong heparanase expression were loose and edematous. Cystic areas and squamous metaplastic areas of the tumor showed intense staining with heparanase antibody proposing the implication of heparanase in these processes. These results suggest the possible contribution of heparanase in the local invasiveness and secondary morphologic changes of ameloblastoma.
Collapse
Affiliation(s)
- Hitoshi Nagatsuka
- Department of Oral Pathology and Medicine, Graduate School of Medicine and Dentistry, Okayama University, 2-5-1 Shikata-cho, Okayama 700-8525, Japan.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Pinheiro JJV, Freitas VM, Moretti AIS, Jorge AG, Jaeger RG. Local invasiveness of ameloblastoma. Role played by matrix metalloproteinases and proliferative activity. Histopathology 2004; 45:65-72. [PMID: 15228445 DOI: 10.1111/j.1365-2559.2004.01902.x] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIMS Ameloblastoma is an odontogenic neoplasm characterized by local invasiveness and recurrence. In this study we analysed the role played by matrix metalloproteinases (MMPs) in the local invasiveness of ameloblastoma. We also attempted to establish a relationship between the presence of MMPs and the proliferative activity of ameloblastoma cells. METHODS AND RESULTS Immunohistochemistry was carried out to detect different MMPs in formalin-fixed paraffin-embedded samples of human ameloblastoma. Immunohistochemistry, however, does not establish whether a given MMP is latent or active. To address this point, we carried out biochemical methods, namely zymography and Western blotting. Our results showed expression of latent and active forms of MMPs 1, 2 and 9 in ameloblastoma. These enzymes may digest bone matrix and release mitogenic factors, which would increase tumour proliferation. This possibility prompted us to study the proliferation of ameloblastoma cells located in close proximity to bone. Silver-stained nucleolar organizer region morphometry revealed that ameloblastoma cells in the vicinity of bone show increased proliferation, when compared with controls. CONCLUSIONS Our results suggest an interdependent mechanism involving MMPs and proliferation of ameloblastoma cells, which may contribute to the local invasiveness of this tumour.
Collapse
Affiliation(s)
- J J V Pinheiro
- Department of Oral Pathology, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | | | | | | | | |
Collapse
|
8
|
Abstract
BACKGROUND To clarify the roles of rat sarcoma (Ras)/mitogen-activated protein kinase (MAPK) signaling pathway in oncogenesis and cytodifferentiation of odontogenic tumors, K-Ras gene status and expression of Ras, Raf1, MAPK/extracellular signal-regulated kinase (ERK) kinase (MEK)1, and ERK1/2 proteins were analyzed in ameloblastomas as well as in tooth germs. METHODS Paraffin sections of 10 tooth germs and 46 benign and 6 malignant ameloblastomas were examined immunohistochemically for the expression of K-Ras, Raf1, MEK1, and ERK1/2. Frozen tissue samples of 22 benign ameloblastomas and 1 malignant (metastasizing) ameloblastoma were analyzed by direct DNA sequencing to detect K-Ras gene alteration. RESULTS Immunohistochemical reactivity for K-Ras, Raf1, MEK1, and ERK1/2 was detected in both normal and neoplastic odontogenic epithelium, and these molecules were reactive chiefly with odontogenic epithelial cells neighboring the basement membrane. Plexiform ameloblastomas showed slightly stronger expression of these Ras/MAPK signaling molecules than follicular ameloblastomas. Keratinizing cells and granular cells showed decreased reactivity for the signaling molecules. Basal cell ameloblastomas showed slightly stronger reactivity for the signaling molecules than did the other subtypes. K-Ras immunoreactivity in malignant ameloblastomas was lower than that in dental lamina of tooth germs. Direct DNA sequencing showed a GGT to GCT point mutation at codon 12 of K-Ras gene in one ameloblastoma. CONCLUSION Expression of K-Ras, Raf1, MEK1, and ERK1/2 in tooth germs and ameloblastomas suggests that Ras/MAPK signaling pathway functions to regulate cell proliferation and differentiation in both normal and neoplastic odontogenic epithelium. K-Ras gene status implied that K-Ras mutations might play a minor role in oncogenesis of odontogenic epithelium.
Collapse
Affiliation(s)
- Hiroyuki Kumamoto
- Division of Oral Pathology, Department of Oral Medicine and Surgery, Tohoku University Gradudate School of Dentistry, Sendai, Japan.
| | | | | |
Collapse
|
9
|
Wang J, Zhong M, Wang Z. [Expression of human telomerase reverse transcriptase and bcl-2 in ameloblastoma]. Hua Xi Kou Qiang Yi Xue Za Zhi 2003; 21:441-3. [PMID: 14732976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
OBJECTIVE To study the expression of telomerase reverse transcriptase (hTERT) and bcl-2 in ameloblastoma (AB), METHODS: hTERT mRNA in 54 cases of AB (primary AB 31 cases, recurrent AB 17 cases, malignant AB 4 cases) and 7 cases of oral normal mucosa was detected by in situ hybridization, and bcl-2 by S-P method. RESULTS The expression of hTERT mRNA was negative or weak in normal oral mucosa (14.3%), moderate or strong in AB (94.4%). There was a significant difference in these two groups (P < 0.001). The difference between the expressions of hTERT in primary, recurrent and malignant AB was significant (P < 0.05). The positive ratio of bcl-2 in AB and normal oral mucosa was respectively 88.0%, 44.4%. There was a significant statistical difference in these two groups (P < 0.001). hTERT mRNA was stronger in recurred or malignantly transformed AB (P < 0.05). CONCLUSION The expression of hTERT and bcl-2 is stronger in recurred or malignantly transformed AB, and it could be used as an indicator of AB prognosis. Telomerase activity and bcl-2 expression play an important role in genesis and development of AB.
Collapse
Affiliation(s)
- Jie Wang
- Department of Pathology, College of Stomatology, China Medical University, Shenyang 110002, China
| | | | | |
Collapse
|
10
|
Kumamoto H, Yamauchi K, Yoshida M, Ooya K. Immunohistochemical detection of matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) in ameloblastomas. J Oral Pathol Med 2003; 32:114-20. [PMID: 12542835 DOI: 10.1034/j.1600-0714.2003.00086.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND To evaluate the roles of matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs) in tumor progression, expression of MMP-1, -2 and -9 and TIMP-1 and -2 was analyzed in ameloblastomas as well as tooth germs. METHODS Frozen tissue sections of seven tooth germs and 22 ameloblastomas were immunohistochemically examined using anti-MMP-1, -2 and -9 and anti-TIMP-1 and -2 antibodies. RESULTS MMP-1, -2 and -9 and TIMP-1 and -2 were expressed strongly in mesenchymal components of tooth germs, and stromal cells of ameloblastomas. Immunoreactivity for MMP-9 in stromal cells of ameloblastomas was significantly stronger than in mesenchymal cells of dental follicles and dental papillae. Dental laminae showed weak MMP-2 expression in six tooth germs, MMP-9 expression in two tooth germs and TIMP-1 expression in six tooth germs. Some tumor cells showed weak MMP-2 expression in 19 ameloblastomas, MMP-9 expression in four ameloblastomas and TIMP-1 expression in all cases. TIMP-2 reactivity was prominently found in basement membrane zones of dental laminae in tooth germs, and tumor cell islands or nests in ameloblastomas. CONCLUSION Expression of MMPs and TIMPs was considered to be associated with interactions between epithelial cells and mesenchymal components in normal and neoplastic odontogenic tissues; these molecules might play a role in regulation of tumor progression in ameloblastomas as well as regulation of developmental processes in tooth germs.
Collapse
Affiliation(s)
- Hiroyuki Kumamoto
- Department of Oral Medicine and Bioregulation, Tohoku University Graduate School of Dentistry, Sendai, Japan.
| | | | | | | |
Collapse
|
11
|
Abstract
Telomerase activity is believed to be crucial for cell immortalization and cancerization, and is proven to be induced by c-myc protein. Telomerase reverse transcriptase (TERT) has been recently identified as a catalytic subunit of telomerase, whose expression is closely correlated with telomerase activity. We estimated telomerase activity by the telomeric repeat amplification protocol (TRAP) assay and examined the immunohistochemical expression of TERT and c-myc protein in 21 ameloblastoma tissues. All ameloblastoma samples were positive for telomerase activity, and TERT expression was detected in the nuclei of neoplastic cells but not in those of stromal cells. Numerous peripheral columnar or cuboidal cells, sporadic central polyhedral cells and some granular cells in ameloblastomas reacted with anti-TERT antibody. These results suggest that telomerase activity is associated with the oncogenesis or proliferative potential of odontogenic epithelium. The expression of c-myc protein showed a similar distribution pattern to that of TERT, suggesting that c-myc protein might induce telomerase activity in ameloblastomas.
Collapse
Affiliation(s)
- H Kumamoto
- Department of Oral Pathology, Tohoku University School of Dentistry, Sendai, Japan
| | | | | |
Collapse
|
12
|
Takata T, Zhao M, Uchida T, Wang T, Aoki T, Bartlett JD, Nikai H. Immunohistochemical detection and distribution of enamelysin (MMP-20) in human odontogenic tumors. J Dent Res 2000; 79:1608-13. [PMID: 11023283 DOI: 10.1177/00220345000790081401] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Enamelysin is a tooth-specific protease that was initially isolated from porcine enamel organ and subsequently from human odontoblasts. Since this protease is thought to play important roles in tooth development, the evaluation of enamelysin in odontogenic tumors may aid our understanding of the histogenesis and cell differentiation of such lesions. A monoclonal antibody (203-1C7) was generated against synthesized human enamelysin oligopeptide and was used to assess the immunolocalization of enamelysin in healthy developing tooth germs and various types of odontogenic lesions. In tooth germs, enamelysin expression was detected only in the secretory enamel. Thus, 203-1C7 may serve as an enamel-specific marker in the late stage of enamel matrix development and calcification. In odontogenic lesions, strong enamelysin staining was demonstrated in the immature enamel matrix of ameloblastic fibro-odontomas and odontomas. Furthermore, enamelysin was also detected in globular amyloid masses and calcified foci in calcifying epithelial odontogenic tumors, hyaline droplets, small and large mineralized areas in adenomatoid odontogenic tumors, and a portion of ghost cells in calcifying odontogenic cysts. Positive reactivity was also observed in selected tumor cells in some of these tumors. No intracellular staining for enamelysin was detected in ameloblastomas or the ameloblastic portion of ameloblastic fibro-odontomas. Also, enamelysin was not detected in dentin, dysplastic dentinoid hyaline matrices, and cementum that were present within the tumors examined. Thus, taken together, our results suggest that the enamelysin-specific monoclonal antibody (203-1C7) may be utilized as a marker of early enamel development and that enamelysin may be involved in the pathogenesis of specific odontogenic tumors.
Collapse
Affiliation(s)
- T Takata
- Department of Oral Pathology, Faculty of Dentistry, Hiroshima University, Japan.
| | | | | | | | | | | | | |
Collapse
|
13
|
Abstract
Telomerase is a ribonucleoprotein complex intimately associated with cell immortalization and neoplastic transformation. In almost all types of cancer this enzyme is reactivated and stabilizes telomere length. It may be necessary for continuous cell proliferation. In this study we used a non-radioactive polymerase chain reaction assay to analyze telomerase activity in various tissue specimens taken from the oral cavity. Four of 4 (100%) squamous cell carcinoma cell lines, 28 of 29 (96%) malignant tumors, 10 of 28 (36%) benign lesions, and none of the 14 (0%) oral control tissues possessed telomerase activity. Moreover, 4 of 15 (27%) oral rinses and 3 of 3 (100%) samples of ascites and pleural effusion taken from patients with oral malignancy were telomerase positive. These findings indicate that the evaluation of telomerase activity in tissue and body fluid specimens may provide information useful in the diagnosis of oral malignancy.
Collapse
Affiliation(s)
- T Sumida
- Department of Oral Surgery, Ehime University School of Medicine, Japan
| | | | | | | | | | | |
Collapse
|
14
|
Chomette G, Mosadomi A, Auriol M, Vaillant JM. Histoenzymological features of epithelial cells in lesions of oral mucosa in cysts and ameloblastomas of jaws. Int J Oral Surg 1985; 14:61-72. [PMID: 3921482 DOI: 10.1016/s0300-9785(85)80012-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A histoenzymological study was carried out on 41 tissue specimens removed at biopsy and for surgical operations of the following lesions: benign hyperkeratosis, lichen planus, severe epithelial dysplasia, carcinoma in situ, epidermoid carcinoma, radicular cyst, odontogenic keratocyst and ameloblastoma. The purpose of this study was to study some possibly significant variations in levels of activities of oxidative enzymes, diaphorases, acid phosphatases and Naphthol esterases in such lesions (normal oral mucosa and epidermis serving as controls). In the lesions of the oral mucosa, these histoenzymological variations were not sufficiently characteristic to contribute to histological diagnosis. In lichen planus, some vacuolated or necrotic basal cells lacked enzyme activities, whereas in the upper layers, enzyme activities were irregularly present. Benign hyperkeratosis showed enzymatic activities similar to those of the normal epidermis, namely high oxidative activities particularly prominent in basal cells and in granular layer, and esterase activity beneath the keratinized layer. In severe epithelial dysplasia, carcinoma in situ and epidermoid carcinoma, numerous variations of activities of oxidative enzymes, esterases and acid phosphatase were seen from one cell to the other. In cystic diseases of jaws, enzymatic activities were equally nonspecific in the epithelial lining of the radicular cyst and the odontogenic keratocyst (activities similar to those of normal oral epithelium and epidermis, respectively). But in common ameloblastoma, there was diffuse uniformly low oxidative enzymatic activities in the epithelium and high widespread activity of alkaline phosphatase in the stroma. The latter may be useful in differentiating the cystic acanthomatous variety of ameloblastoma from odontogenic keratocysts of the jaws.
Collapse
|
15
|
Chomette G, Auriol M, Vaillant JM. Histoenzymological features of epithelial cells in epidermoid carcinomas of oral mucosa and in ameloblastomas of jaws. Pathol Biol (Paris) 1984; 32:995-1003. [PMID: 6514388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
An histoenzymological study comprising oxidative enzymes, diaphorases, acid and alkaline phosphatases, naphtolesterases, referred to 60 biopsy and operation specimens. It showed interesting arguments for diagnosis and understanding of precancerous and cancerous lesions of the oral mucosa and also of ameloblastomas of jaws. The enzymatic activities of precancerous and cancerous oral lesions were compared with those of normal buccal mucosa and epidermis, benign hyperkeratosis (activities similar to those of the epidermis) and lichen planus. In severe dysplasia and epidermoid carcinoma, numerous variations of oxidative, esterase and acid phosphatase activities were seen from one cell to another. But this pattern was non conclusive for the diagnosis, a similar one being found in inflammatory lesions and especially in the lichen planus. In lobules of invasive carcinoma, the strong enzymological activities (particularly acid phosphatases, naphtolesterases) were correlated with a high degree of differentiation of the tumor and these enzymatic methods offered an interesting contribution for the fine evaluation of histoprognosis in malignant epithelial tumors. Among the lesions of jaws, radicular and dentigerous cysts had low enzymatic activities similar to those of normal buccal epithelium. The epidermoid cysts (keratocysts), because of their highly differentiated keratinization, like benign hyperkeratosis, had the same enzymatic activities as epidermis. Peculiar were the enzymatic activities of common ameloblastoma; they differed from those of other lesions of squamous tissues (low oxidative activities without decreasing gradient). Besides, round epithelial clumps, the stroma showed a high and widespread alkaline phosphatase activity. Thus, this peculiar stromal activity may be useful to differentiate ameloblastoma from the other epidermoid cysts of the jaws. In the other hand, such a constatation suggests a low degree of odontogenic induction.
Collapse
|
16
|
Abstract
Four cases of granular-cell ameloblastoma were studied by light and electron microscopy, histochemistry and electron enzyme histochemistry. Microscopically, granular cells commonly occurred in a follicular pattern, but, in one case, they were in a plexiform pattern. The high activity of acid phosphatase and electron microscopic features revealed that the cytoplasmic granularity was ascribed to the high content of lysosomes. It was speculated that granular-cell ameloblastoma occurs due to the altered dysfunction of tumor cells, and the age factor is related to the pathogenesis of this tumor.
Collapse
|
17
|
Abstract
The ultrastructural and enzyme cytochemical features of two follicular ameloblastomas were investigated. The peripheral cells of the follicular areas in both lesions had several types of tall columnar cells which were highly polarized and showed varying degrees of cellular differentiation. These polarized cells had their nuclei situated away from the basal lamina, and often contained dilated strands of endoplasmic reticulum in the subnuclear cytoplasm. Some of these cells also contained dense-cored secretory granules, condensing granules and coated vesicles in the cytoplasm adjacent to the basal plasma membrane. These cells bore a striking resemblance to pre-ameloblasts and early secretory ameloblasts. Alkaline phosphatase and ATPase cytochemistry supported these morphologic observations. Interestingly, the central cells of the follicular areas were consistently negative for alkaline phosphatase activity as were the peripheral cells, while both cell types had ATPase activity demonstrable at their cell surface.
Collapse
|
18
|
Chomette G, Mosadomi A, Auriol M, Vaillant JM. [Histoenzymological characteristics of epithelial cells in oral mucosal lesions and jaw cysts. Diagnostic significance]. J Biol Buccale 1983; 11:153-66. [PMID: 6577002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
An histoenzymological study (including oxidative enzymes, diaphorases, acid and alkaline phosphatases and naphtolesterases) of 41 biopsy and operation specimens revealed interesting factors in the diagnosis of some lesions of the buccal mucosa, and also of cysts and ameloblastomas of the jaw. When compared with normal buccal mucosa and epidermis, the enzymatic activities found in the oral lesions, fell into three different types. In non dysplasic leukoplakia, enzymatic activities were found that were similar to those of the epidermis (high oxidative activities, particularly prominent in basal cells and in the granular layer and esterasic activity beneath the keratinised layer). In lichen planus, some vacuolized or necrotic basal cells occurred which lacked enzymatic activity. In the upper layers, the distribution of the enzymes was irregular. In severe dysplasia and epidermoid carcinoma, numerous variations of oxidative, esterasic and acid phosphatase activities were seen from one cell to another. Among the lesions of the jaws, radicular cysts as well as dentigerous cysts, had low enzymatic activities, similar to those of normal buccal epithelium. The epidermoid cysts (keratocysts), because of their highly differentiated keratinization, like leukoplakia, had the same enzymatic activities as epidermis. The enzymatic activities of common ameloblastoma differed from those of malpighian tissues (low oxidative activities without decreasing gradient). Besides round epithelial nests, the stroma showed a high and widespread alkaline phosphatase activity, which indicated a low degree of odontogenic induction. Thus, this peculiar stromal activity may be useful in differentiating between cystic epidermoid varieties of ameloblastoma and the other epidermoid cysts of the jaws.
Collapse
|
19
|
Abstract
Electron microscopic examination of three adamantinomas of long bones revealed structures usually observed in both mesenchymal and epithelial tumours. Tumour cells showing high alkaline phosphatase activity frequently tended to line clefts in connective tissue, resembling endothelial cells. The long processes of such cells showed fenestration. In areas showing fibre production the tumour cells were in close relationship to collagen fibrils. The latter were found, together with microfibrils, between the processes and above the basement membranes. The tumour cells were interconnected by desmosomes with tonofilaments and contained numerous bundles of microfilaments. All three cases revealed tiny intracytoplasmic inclusions resembling Weibel-Palade endothelial bodies. In addition, some of the structures in the lumena contained definite acid mucosubstances. A squamous cell pattern was present in only one of the three specimens. The coincidence of divergent structures in a single specimen has led us to the conclusion that the so-called adamantinoma of long bone might be possibly related to tumours of mesodermal or mesectodermal origin.
Collapse
|
20
|
Yoshimura Y, Fukuda J, Tanioka H, Kawakatsu K. 1-naphthyl acetate esterases in fluids and tissues of jaw cysts. Int J Oral Surg 1977; 6:100-6. [PMID: 68020 DOI: 10.1016/s0300-9785(77)80006-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The activity and electrophoretic mobility of 1-naphthyl acetate esterases in cystic fluids and cystic tissues of ameloblastomas, follicular and apical cysts were examined. The cystic fluids showed lower activities than sera but had very similar patterns on the electrophoretogram. The activity levels of the three kinds of cystic fluids were not statistically significantly different. The fluid esterases may have originated from serum but they were not produced by the cystic lining tissue. Ameloblastoma tissues showed the highest activity per wet weight and per mg protein of the three kinds of cyst lesions (P less than 0.05). On the electrophoretogram, the esterase-I activity constituted 41% of the total activity in ameloblastomas, whereas in follicular cysts and apical cysts the esterase-I activity constituted 32% and 24% of the total activity, respectively.
Collapse
|
21
|
Suzuki M. A study of biological chemistry on the nature of jaw cysts. On the maintainance of homoeostasis in jaw cyst fluid. J Maxillofac Surg 1975; 3:106-18. [PMID: 1055768 DOI: 10.1016/s0301-0503(75)80027-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Jaw cyst lining cells have an active transporting mechanism for Na+ ion and K+ion, a secreting mechanism and a selecting mechanism, and they allow permeation of electrolytes, lipids and protein into cysts. The components within the cysts have a controlling metabolism, and keep the system stable. Tumour wall cells of cystic ameloblastoma have only a passive transporting mechanism for various substances. Their nature differs from that of jaw cyst lining cells.
Collapse
|
22
|
Dos Santos JM, Figueiredo de HS, Da Silveira JC. [Intermediary stratum behavior in odontogenic tumor (author's transl)]. Arq Cent Estud Fac Odontol UFMG (Belo Horiz) 1975; 12:221-33. [PMID: 1072841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
23
|
Mori M, Kuroi M, Kawakatsu K. Histochemical observation of soft tissue ameloblastoma. J Osaka Univ Dent Sch 1972; 12:109-16. [PMID: 4514729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
24
|
Ogasahara S. [Lactate dehydrogenase in human oral neoplastic tissues]. Kokubyo Gakkai Zasshi 1972; 39:350-65. [PMID: 4509418 DOI: 10.5357/koubyou.39.350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
25
|
Mori M, Tamura K, Kawakatsu K. Histochemical observations of enzymes in adenoameloblastoma. Histochemical comparisons of enzymes among tooth germ, adenoameloblastoma, and ameloblastoma. Oral Surg Oral Med Oral Pathol 1970; 30:659-69. [PMID: 5273845 DOI: 10.1016/0030-4220(70)90391-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
26
|
Mori M. Histochemical evaluation of enzymes in ameloblastic tumors--acanthomatous and granular-cell ameloblastoma. J Oral Surg 1970; 28:825-31. [PMID: 5273808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
27
|
Timperley WR. Histochemistry of craniopharyngiomas, ameloblastomas, dental cysts and dentigerous cysts. J Pathol 1970; 101:P8-9. [PMID: 5504729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
28
|
Mori M, Sugimura M, Matsuura H. Histochemical comparisons of enzymes in craniopharingioma and ameloblastoma. Ann Histochim 1969; 14:349-57. [PMID: 4318796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
29
|
|
30
|
Takagi M. Adenomatoid ameloblastoma. An analysis of nine cases by histopathological and electron microscopic study. Bull Tokyo Med Dent Univ 1967; 14:487-506. [PMID: 4296740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|