Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
J Periodontol ; 72(12): 1726-33, 2001 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-11811509

RESUMO

BACKGROUND: Hereditary gingival fibromatosis (HGF) is a rare oral disease characterized by a slow and progressive enlargement of both the maxilla and mandible gingiva. Increased proliferation, elevated synthesis of extracellular matrix, particularly collagen, and reduced levels of matrix metalloproteinases seem to contribute to the pathogenesis of gingival overgrowth in HGF patients. Transforming growth factor-beta1 (TGF-beta1) is an important cytokine thought to play a major role in fibrotic disorders such as HGF due to its ability to stimulate the synthesis and reduce the degradation of extracellular matrix. In HGF fibroblasts, TGF-beta1 autocrine stimulation reduces expression and production of matrix metalloproteinases. However, the role of TGF-beta1 in fibroblast growth modulation has not been established in this disease. METHODS: The aim of this study was to confirm the increased proliferation rate of HGF fibroblast cell lines and to explore a possible autocrine role of TGF-beta1 as a cell growth stimulator by blocking production of this endogenous cytokine using 2 well-established systems: antisense oligonucleotides and neutralizing antibodies. RESULTS: Four different cellular proliferation assays, bromodeoxyuridine labeling, argyrophilic nucleolar organizing region staining, proliferating cell nuclear antigen, and mitotic indexes, confirmed that fibroblasts from HGF proliferate significantly faster than those from normal gingiva. Antisense oligonucleotides reduced TGF-beta1 production as demonstrated by capture enzyme-linked immunosorbent assay, whereas TGF-beta1 expression levels were not significantly modified. Blocking TGF-beta1 synthesis with oligonucleotides or its activity with specific antibodies resulted in a decreased magnitude of HGF fibroblast proliferation. CONCLUSION: These results are consistent with the existence of an autocrine role of TGF-beta1 as a stimulator of HGF fibroblast proliferation.


Assuntos
Fibromatose Gengival/fisiopatologia , Gengiva/efeitos dos fármacos , Fator de Crescimento Transformador beta/genética , Fator de Crescimento Transformador beta/farmacologia , Adulto , Análise de Variância , Anticorpos , Comunicação Autócrina/fisiologia , Bromodesoxiuridina/metabolismo , Divisão Celular/efeitos dos fármacos , Células Cultivadas , Feminino , Fibroblastos/citologia , Fibroblastos/efeitos dos fármacos , Fibromatose Gengival/genética , Citometria de Fluxo , Regulação da Expressão Gênica , Gengiva/citologia , Gengiva/fisiopatologia , Humanos , Masculino , Índice Mitótico , Região Organizadora do Nucléolo/patologia , Oligonucleotídeos Antissenso/farmacologia , Antígeno Nuclear de Célula em Proliferação/biossíntese , Biossíntese de Proteínas/efeitos dos fármacos , RNA Mensageiro/análise , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Fator de Crescimento Transformador beta/antagonistas & inibidores , Fator de Crescimento Transformador beta/fisiologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...