Helicobacter pylori: novidades, genes de virulência e resistência aos antibióticos na Colômbia
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Resumo
Helicobacter pylori é um carcinógeno tipo I resistente a múltiplos antibióticos e com alta prioridade na saúde pública. A infecção por este microrganismo está influenciada por uma interação complexa entre a genética do hospede, o entorno e múltiplos fatores de virulência da cepa infectante. Afeta a 50% da população mundial, provocando afeções gastroduodenais graves, a maioria de forma assintomática. 20% dos indivíduos com H. pylori podem desenvolver através do tempo lesões gástricas pré-neoplásicas e 2% deles um câncer gástrico. As manifestações clínicas gastrointestinais e extragastrointestinais estão associadas à sua virulência e à resposta do sistema imunológico com a liberação de citocinas pró-inflamatórias, tais como TNF-alfa, IL-6, IL-10 e IL-8, causantes de inflamação aguda e crónica. Múltiplos fatores de virulência hão sido estudados como o gene A associado à citotoxina (CagA) e a citotoxina vacuolante (VacA), os quais jogam um papel importante no aparecimento do câncer gástrico. Dada a resistência cada vez maior aos antibióticos utilizados, as linhas de estudo no futuro imediato devem estar encaminhadas em estabelecer a utilidade dos novos antibióticos e a determinação de profagos colombianos em todo o país. Esta revisão tem como objetivo fazer uma atualização sobre as características do H. pylori, os mecanismos patogénicos, genes de virulência, sua associação com o maior risco de câncer gástrico, farmacorresistência microbiana e sua erradicação.
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