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        "resumen" => "<span id="as0005" class="elsevierStyleSection elsevierViewall"><p id="sp0005" class="elsevierStyleSimplePara elsevierViewall">Faz-se uma revis&#227;o da interven&#231;&#227;o da c&#233;lula epitelial br&#244;nquica na fisiopatologia da asma&#46; O epit&#233;lio que reveste as vias respirat&#243;rias actua como uma barreira f&#237;sica&#44; separando o meio externo do meio interno pul-monar&#44; controla a permeabilidade intercelular e transcelular&#44; e&#44; deste modo&#44; a acessibilidade dos agressores inalantes &#224;s c&#233;lulas apresentadoras de antig&#233;nio en-volvidas na resposta imunoinflamat&#243;ria&#46; As c&#233;lulas epiteliais unidas por <span class="elsevierStyleItalic">tight junctions</span> contribuem para a integridade das vias a&#233;reas e expressam <span class="elsevierStyleItalic">poliovirus re</span>-<span class="elsevierStyleItalic">ceptor&#8211;related protein</span> &#40;PRR&#41;&#44; <span class="elsevierStyleItalic">toll like receptors</span> &#40;TLR&#41; e <span class="elsevierStyleItalic">protease-activated receptors</span> &#40;PAR&#41;&#44; que reconhecem agentes bacterianos e alerg&#233;nios&#46; A sua disfun&#231;&#227;o transforma-as em fonte de mediadores intervenientes na inflama&#231;&#227;o&#46;</p><p id="sp0010" class="elsevierStyleSimplePara elsevierViewall">A interac&#231;&#227;o bidireccional entre&#44; por um lado&#44; o epit&#233;lio e os elementos constitutivos do br&#244;nquio e por outro&#44; as part&#237;culas inaladas&#44; tem subjacente a forma-&#231;&#227;o de uma unidade&#44; com identidade pr&#243;pria desig-nada EMTU &#8211; <span class="elsevierStyleItalic">epithelial mesenchymal trophic unit&#46;</span> Esta extensa interven&#231;&#227;o coloca a c&#233;lula epitelial no centro de ac&#231;&#227;o da cronicidade e remodela&#231;&#227;o do pro-cesso asm&#225;tico&#46;</p><p id="sp1010" class="elsevierStyleSimplePara elsevierViewall">As doen&#231;as infecciosas e o <span class="elsevierStyleItalic">stress</span> ambiental s&#227;o capazes de induzir altera&#231;&#245;es a n&#237;vel da c&#233;lula epitelial suscep-t&#237;veis de modificar a sua resposta a estimula&#231;&#245;es futu-ras&#44; nomeadamente a ampliar a resposta a outras agress&#245;es infecciosas por ac&#231;&#227;o sin&#233;rgica das vias de sinaliza&#231;&#227;o&#46;</p><p id="sp2010" class="elsevierStyleSimplePara elsevierViewall">O epit&#233;lio br&#244;nquico tem assim fun&#231;&#245;es de barreira que lhe permite exercer uma permeabilidade selectiva&#44; a n&#237;vel intracelular e transcelular&#44; &#233; ainda metabolica-mente activo pelas capacidade de produzir mediadores quimiot&#225;cticos e citocinas envolvidos no recrutamento e na activa&#231;&#227;o celular&#44; com repercuss&#227;o na broncomo-tricidade e na remodela&#231;&#227;o da parede br&#244;nquica&#46;</p><p id="sp0015" class="elsevierStyleSimplePara elsevierViewall"><span class="elsevierStyleBold">Rev Port Pneumol 2009&#59; XV &#40;3&#41;&#58; 461-472</span></p></span>"
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Vol. 15. Issue 3.
Pages 461-472 (May - June 2009)
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Vol. 15. Issue 3.
Pages 461-472 (May - June 2009)
Artigo de Revisão/Review Article
Open Access
A intervenção da célula epitelial na asma
The role of the epithelial cell in asthma
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Anabela Mota Pinto1, Ana Todo-Bom2
1 Professora Associada com Agregação de Fisiopatologia – Faculdade de Medicina da Universidade de Coimbra Directora do Instituto de Patologia Geral
2 Assistente Hospitalar Graduada em Imunoalergologia nos Hospitais da Universidade de Coimbra. Doutoramento em Medicina Interna – Pneumologia pela Faculdade de Medicina da Universidade de Coimbra
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Resumo

Faz-se uma revisão da intervenção da célula epitelial brônquica na fisiopatologia da asma. O epitélio que reveste as vias respiratórias actua como uma barreira física, separando o meio externo do meio interno pul-monar, controla a permeabilidade intercelular e transcelular, e, deste modo, a acessibilidade dos agressores inalantes às células apresentadoras de antigénio en-volvidas na resposta imunoinflamatória. As células epiteliais unidas por tight junctions contribuem para a integridade das vias aéreas e expressam poliovirus re-ceptor–related protein (PRR), toll like receptors (TLR) e protease-activated receptors (PAR), que reconhecem agentes bacterianos e alergénios. A sua disfunção transforma-as em fonte de mediadores intervenientes na inflamação.

A interacção bidireccional entre, por um lado, o epitélio e os elementos constitutivos do brônquio e por outro, as partículas inaladas, tem subjacente a forma-ção de uma unidade, com identidade própria desig-nada EMTU – epithelial mesenchymal trophic unit. Esta extensa intervenção coloca a célula epitelial no centro de acção da cronicidade e remodelação do pro-cesso asmático.

As doenças infecciosas e o stress ambiental são capazes de induzir alterações a nível da célula epitelial suscep-tíveis de modificar a sua resposta a estimulações futu-ras, nomeadamente a ampliar a resposta a outras agressões infecciosas por acção sinérgica das vias de sinalização.

O epitélio brônquico tem assim funções de barreira que lhe permite exercer uma permeabilidade selectiva, a nível intracelular e transcelular, é ainda metabolica-mente activo pelas capacidade de produzir mediadores quimiotácticos e citocinas envolvidos no recrutamento e na activação celular, com repercussão na broncomo-tricidade e na remodelação da parede brônquica.

Rev Port Pneumol 2009; XV (3): 461-472

Palavras-chave:
Asma
epitélio
inflamação
Abstract

It is done a review of the intervention of the epithelial bronchial cell in the pathophysiology of asthma. The respiratory epithelium acts as a physical barrier that separates the external environment from the pulmonary internal environment. It controls the intercellular and trans-cellular permeability and this way the accessibility of the inhaled pathogens to the antigen presenting cells involved in the immuno-inflammatory response. Epithelial cells connected by tight junctions contribute to the barrier function of the airways. They express a poliovirus receiver – related protein (PRR), toll like receptors (TLRs) and protease-activated receptors (PARs), which recognize bacterial agents and allergens. Its dysfunction turns them into important sources of inflammatory mediators.

The bidirectional interaction between the epithelium and other bronchial wall elements with inhaled particles originates a structure with its own identity, the designated EMTU – Epithelial Mesenchymal Trophic Unit.

These observations support a central role for the epithelial cell in chronic inflammation and in the remodelling of the asthmatic process.

Infectious diseases and environmental stress can acti-vate different cell receptors and signalling pathways that induce changes in the cell surface modifying their response to future stimulations, namely to other infectious aggressions.

The bronchial epithelium has barrier functions with selective permeability; it has metabolic activity producing cytokines and chemokines stimulating the cell’s recruitment and activation, increasing the bronchial reactivity and the remodelling of the airways.

Rev Port Pneumol 2009; XV (3): 461-472

Key-words:
Asthma
epithelium
inflammation
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Copyright © 2009. Sociedade Portuguesa de Pneumologia/SPP
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