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1.
J Oral Pathol Med ; 38(9): 701-7, 2009 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-19659475

RESUMO

BACKGROUND: Galectin-3 has been implicated in tumor progression of some malignancies as thyroid, prostate, and salivary gland tumors. Recently, it has been suggested that this protein may be an important mediator of the beta-catenin/Wnt pathway. Moreover, nuclear galectin-3 expression has been implicated in cell proliferation, promoting cyclin D1 activation. Thus, the present study aimed to correlate galectin-3 expression with beta-catenin and cyclin D1 expressions in adenoid cystic carcinoma (ACC) and in polymorphous low-grade adenocarcinoma (PLGA). METHODS: Fifteen formalin-fixed paraffin-embedded cases of each tumor were retrieved from the files of the Surgical Oral Pathology Service at the University of São Paulo and the proteins were analyzed by immunohistochemistry. RESULTS: Adenoid cystic carcinoma showed galectin-3 immunostaining mainly in the nuclei, while PLGA revealed a positive mostly cytoplasmic reaction to galectin-3 in the largest part of tumor cells. Both tumors showed intense cytoplasmic/nuclear staining for beta-catenin in majority of cases. Cyclin D1 immunoreactivity was not detected in 14/15 PLGA and showed specific nuclear staining in 10/15 cases of ACC in more than 5% of the neoplastic cells. Cyclin D1 expression was correlated with cytoplasmic and nuclear galectin-3 expression in ACC (P < 0.05). CONCLUSIONS: These results suggest that in ACC galectin-3 may play a role in cellular proliferation through cyclin D1 activation. In addition, nuclear expression of galectin-3 in ACC may be related to a more aggressive behavior of this lesion. Although beta-catenin seems to play a role in carcinogenesis in both lesions, it seems that it does not bind to galectin-3 for cyclin D1 stimulation.


Assuntos
Adenocarcinoma/metabolismo , Carcinoma Adenoide Cístico/metabolismo , Ciclina D1/biossíntese , Galectina 3/biossíntese , Neoplasias das Glândulas Salivares/metabolismo , beta Catenina/biossíntese , Adenocarcinoma/química , Adenocarcinoma/patologia , Carcinoma Adenoide Cístico/química , Membrana Celular/metabolismo , Núcleo Celular/metabolismo , Transformação Celular Neoplásica , Citoplasma/metabolismo , Regulação Neoplásica da Expressão Gênica , Humanos , Imuno-Histoquímica , Estudos Retrospectivos , Neoplasias das Glândulas Salivares/química , Transdução de Sinais , Proteínas Wnt/fisiologia
2.
Oral Dis ; 13(6): 564-9, 2007 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-17944673

RESUMO

OBJECTIVES: Plasmablastic lymphoma (PBL) of the oral cavity is an aggressive neoplasm derived from B cell, considered to be the second more common among human immunodeficiency virus (HIV)-associated malignancies. As Epstein-Barr virus (EBV) infection has been associated with this neoplasm, the aim of the present study was to assess the presence of EBV in 11 cases of oral HIV-related PBL and investigate the controversial issue of the presence of Human herpesvirus-8 (HHV-8) in these tumors. METHODS: DNA was extracted from nine cases of HIV-associated oral lymphomas, diagnosed as PBL, and genomic material was amplified by polymerase chain reaction to verify the presence of EBV. In situ hybridization (ISH) for EBV was performed in five cases. Immunohistochemical analysis was conducted to confirm previous diagnosis and verify HHV-8 infection. RESULTS: The 11 cases had diagnosis confirmed by immunohistochemical analysis. Only nine cases presented an adequate amount of DNA for analysis, and EBV was detected in seven of them. The five cases tested for EBV viral infection by ISH showed positive signals. All 11 cases were negative for HHV-8. CONCLUSION: The presence of EBV in all cases studied favors a direct role of this virus in the development of HIV-related PBL, and this finding could be considered when dealing with HIV patients.


Assuntos
DNA Viral/análise , Herpesvirus Humano 4/isolamento & purificação , Linfoma Relacionado a AIDS/virologia , Neoplasias Bucais/virologia , Adulto , Infecções por Vírus Epstein-Barr/virologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade
4.
Dentomaxillofac Radiol ; 35(3): 209-12, 2006 May.
Artigo em Inglês | MEDLINE | ID: mdl-16618857

RESUMO

The aim of this study was to present clinical, histological and immunohistochemical aspects of a polymorphous low grade adenocarcinoma occurring in the mandible. A radiolucent tumour, located in the right mandible, was removed from a 40-year-old woman. Radiographic and CT exams revealed that the lesion expanded bucco-lingual cortical plates and presented an irregular scalloping of the bone. The surrounding lining mucosa was intact. The patient underwent total surgical removal of the lesion with an intraoperative biopsy. Histological diagnosis was polymorphous low-grade adenocarcinoma confirmed by immunohistochemical study. One-year follow up was uneventful. The accurate diagnosis of lesions presenting unusual clinical aspects, as the one presented here, is critical for correctly handling treatment.


Assuntos
Adenocarcinoma/diagnóstico por imagem , Neoplasias Mandibulares/diagnóstico por imagem , Adenocarcinoma/patologia , Adulto , Feminino , Humanos , Neoplasias Mandibulares/patologia , Radiografia Panorâmica , Tomografia Computadorizada por Raios X
5.
Oral Dis ; 9(1): 1-6, 2003 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-12617250

RESUMO

Neoplasms and tumours related to the odontogenic apparatus may be composed only of epithelial tissue or epithelial tissue associated with odontogenic ectomesenchyme. The immunohistochemical detection of different cytokeratins (CKs) polypeptides and vimentin has made it easier to explain the histogenesis of many epithelial diseases. The present study aimed to describe the immunohistochemical expression of cytokeratins 7, 8, 10, 13, 14, 18, 19 and vimentin in the epithelial components of the dental germ and of five types of odontogenic tumours. The results were compared and histogenesis discussed. All cells of the dental germ were positive for CK14, except for the preameloblasts and secreting ameloblasts, in which CK14 was gradually replaced by CK19. CK7 was especially expressed in the cells of the Hertwig root sheath and the stellate reticulum. The dental lamina was the only structure to express CK13. The reduced epithelium of the enamel organ contained CK14 and occasionally CK13. Cells similar to the stellate reticulum, present in the ameloblastoma and in the ameloblastic fibroma, were positive for CK13, which indicates a nature other than that of the stellate reticulum of the normal dental germ. The expression of CK14 and the ultrastructural aspects of the adenomatoid odontogenic tumour probably indicated its origin in the reduced dental epithelium. Calcifying odontogenic epithelial tumour is thought to be composed of primordial cells due to the expression of vimentin. Odontomas exhibited an immunohistochemical profile similar to that of the dental germ. In conclusion, the typical IF of odontogenic epithelium was CK14, while CK8, 10 and 18 were absent. Cytokeratins 13 and 19 labelled squamous differentiation or epithelial cells near the surface epithelium, and CK7 had variable expression.


Assuntos
Queratinas/análise , Tumores Odontogênicos/química , Ameloblastoma/química , Tecido Conjuntivo/química , Órgão do Esmalte/química , Células Epiteliais/química , Humanos , Imuno-Histoquímica , Filamentos Intermediários/química , Queratina-10 , Queratina-14 , Queratina-7 , Queratina-8 , Odontoma/química , Germe de Dente/química , Vimentina/análise
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