Jornal Vascular Brasileiro
https://www.jvascbras.org/article/doi/10.1590/jvb.2014.027
Jornal Vascular Brasileiro
Review Article

Inflammatory mediators of coronary artery ectasia

Os mediadores inflamatórios de ectasia coronária

Shi-Min Yuan

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Abstract

The exact mechanisms underlying coronary artery ectasia (CAE) remain uncertain. This study aims to investigate whether and how inflammatory mediators play a role in the pathogenesis of CAE. The data sources of this study were located by literature searches on MEDLINE, Highwire Press and Google search engine for the year range 2000-2013. The most sensitive of the four types of plasma inflammatory mediators were cell adhesion molecules and systemic inflammatory markers followed by cytokines, while proteolytic substances were the least sensitive indicators of CAE. Hypersensitive C-reaction protein, homocysteine, intercellular adhesion molecule 1, vascular cell adhesion molecule 1, matrix metalloproteinase-9, tissue inhibitor of metalloproteinase-2, vascular endothelial growth factor and neopterin levels were significantly higher in CAE and coronary artery disease (CAD) patients than in controls without CAE. The percentage of granulocytes was higher in CAE, in comparison with individuals with normal coronary arteries. Polymerase chain reaction determination of angiotensin converting enzyme genotypes showed that the DD genotype was more prevalent in CAE patients than in CAD patients, while prevalence of the I allele was higher in CAD than in CAE patients. CAE is more a result of inflammatory processes than of extracellular matrix degradation, as demonstrated by investigations of plasma inflammatory mediators, activation markers and angiotensin converting enzyme genotypes. Contemporary theories are unable to explain CAE's predilection for the right coronary artery or the occurrence of multi-vessel and multi-segment involvement.

Keywords

coronary aneurysm, extracellular matrix, inflammation mediators

Resumo

Os mecanismos exatos da ectasia de artérias coronárias (EAC) não são completamente compreendidos. Este estudo busca verificar, em detalhes, se e como os mediadores inflamatórios funcionam na pathogenesis de EAC. A fonte de dados do presente estudo veio da recuperação de literatura das investigações relevantes em MEDLINE, na Prensa de Highwire e na ativação de pesquisa do Google, do ano 2000 para 2013. Dos quatro tipos de mediadores inflamatórios do plasma, as moléculas de adesão de célula e os marcadores inflamatórios sistêmicos foram os mais sensíveis, sendo que cytokines foram mais sensíveis e substâncias de protease foram menos sensíveis na indicação da presença de EAC. A proteína C reativa hipersensível, o homocysteine, a molécula de adesão intercelular 1, a molécula de adesão de célula vascular 1, a matriz metalloproteinase-9, o nervo inibidor de tecido de metalloproteinase-2, o fator de crescimento endothelial vascular e os níveis de neopterin foram mais altos nos pacientes com EAC do que nos controles sem EAC. A porcentagem de granulocytes foi mais alta no grupo EAC, comparando-se com os indivíduos com a artéria coronária normal. A determinação de genótipo de enzima do angiotensin-conversão utilizando-se a técnica de reação em cadeia da polimerase revelou que o genótipo DD foi prevalecente na EAC, mas não nos pacientes de DAC, enquanto a presença do alelo I foi maior na DAC do que no EAC. O EAC é mais um resultado do processo inflamatório do que da degradação da matriz extracelular, como evidenciado por investigações dos mediadores inflamatórios de plasma, marcadores de ativação e genótipos de enzima do angiotensin a conversão. A predileção de EAC na artéria coronária direita e nos envolvimentos de multinavio e de multissegmento não é apurada por teorias contemporâneas.

Palavras-chave

aneurisma coronário;, matriz extracelular;, mediadores de inflamação

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