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Pesquisadores da Universidade Johns Jopkins, nos Estados Unidos, demonstraram por meio de um estudo com ratos que há maior chance de aborto espontâneo devido à infecção por zika no primeiro trimestre de gestação. O estudo foi publicado nesta terça-feira (21) na "Nature Communications".

Outros estudos já haviam demonstrado que o vírus da zika pode atravessar a placenta, estrutura responsável por proteger o feto na barriga da mãe. Sabra L. Klein, imunologista e coautora do artigo, desenvolveu junto a seus colegas um modelo de rato com um sistema imune mais parecido com o dos seres humanos.

O grupo de cientistas injetou cepas diferentes do vírus da zika nos animais. Usaram o tipo encontrado nos surtos na Nigéria e no Camboja, em 1968 e 2010, respectivamente. E aplicaram nos ratos o zika mais recente detectado nas epidemias no Brasil e em Porto Rico.

A viabilidade da gestação ocorreu para 71% das gestações da cepa mais antiga e para 56% para o vírus mais recente. Ou seja: há uma taxa de abortos que varia entre 29% e 44% após a infecção. De acordo com o estudo, isso pode ocorrer por uma infinidade de fatores, já que a relação entre o zika e a perda dos fetos ainda não foi totalmente estudada.

Outra fator é que, quando a infecção dos ratos ocorreu no segundo trimestre de gravidez, o número de abortos foi menor. Isso sugere, segundo o artigo, que há menos vulnerabilidade ao vírus com o decorrer da gestação.

"Precisamos encontrar uma forma de impedir a transmissão do zika através da placenta para o feto, porque é onde o dano é causado", disse Klein. "Nas placentas dos nossos ratos, vemos uma defesa contra o vírus que é montada, mas não é suficiente, especialmente no início da gravidez, tempo que corresponde ao primeiro trimestre da gestação dos seres humanos".

Os pesquisadores também observaram como funciona a ativação das defesas do corpo contra o vírus nas placentas dos ratos utilizados durante a pesquisa. Eles identificaram alguns receptores em células da placenta usados pelo vírus para chegar até o feto. Tais receptores podem ser alvos potenciais para tratamentos contra a doença, disseram os professores.

 

 

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