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1.
Rev. bras. otorrinolaringol ; 71(1): 81-86, jan.-fev. 2005.
Article in Portuguese | LILACS | ID: lil-411443

ABSTRACT

Interacões entre células neoplásicas e constituintes da matriz extracelular (MEC) interferem fortemente no desenvolvimento tumoral, incluindo os localizados em cabeca e pescoco, pois influenciam a proliferacão e sobrevivência celular, bem como a sua capacidade de migrar do sítio primário para outros tecidos e formar metástases. Essa migracão celular é facilitada pela destruicão parcial da MEC, a qual é realizada pelas metaloproteinases (MMPs), que representam uma família de mais de vinte endopeptidases, com atividade controlada pela expressão de inibidores específicos (TIMPs). Diversos estudos utilizando-se de marcadores para constituintes da MEC bem como pelas MMPs têm fornecido informacões adicionais sobre o diagnóstico e prognóstico em carcinomas de cabeca e pescoco. Nesta revisão consideraremos o papel da MEC e das MMPs na progressão desses tumores, enfatizando que não somente a degradacão proteolítica está envolvida neste processo, como também interacões entre vários constituintes da MEC fornecem substrato para regulacão e crescimento destes tumores.


Subject(s)
Humans , Carcinoma, Squamous Cell/enzymology , Extracellular Matrix Proteins/metabolism , Head and Neck Neoplasms/enzymology , Matrix Metalloproteinases/metabolism , Neoplasm Invasiveness/physiopathology , Neoplasm Metastasis/physiopathology , Carcinoma, Squamous Cell/pathology , Extracellular Matrix/metabolism , Head and Neck Neoplasms/pathology , Prognosis
2.
Braz J Otorhinolaryngol ; 71(1): 81-6, 2005.
Article in English | MEDLINE | ID: mdl-16446896

ABSTRACT

Interactions involving tumor cells and the extracellular matrix (ECM) strongly influence tumor development, including head and neck tumors, affecting cell proliferation and survival as well as the ability to migrate beyond the original location into other tissues to form metastases. These cell migration is often facilitated by partial destruction of the surrounding ECM, which is catalyzed by matrix metalloproteinases (MMPs), a family of more than 20 endopeptidases that is controlled by regulated expression of specific inhibitors (TIMPs). Several studies of ECM and MMPs markers have provided additional diagnostic and prognostic information in head and neck carcinomas. In this review, we are considering the role of ECM and MMPs in tumor progression, emphasizing its proteolytic contributors to this process, and interactions between several members of ECM providing substrate to regulation of this process.


Subject(s)
Carcinoma, Squamous Cell/enzymology , Extracellular Matrix Proteins/physiology , Head and Neck Neoplasms/enzymology , Matrix Metalloproteinases/physiology , Neoplasm Proteins/physiology , Carcinoma, Squamous Cell/secondary , Extracellular Matrix/metabolism , Head and Neck Neoplasms/pathology , Humans , Neoplasm Invasiveness , Prognosis
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