RESUMO
Malaria remains a serious public health problem with significant morbidity and mortality. This study was conducted to identify whether ficolin-A could play an active role of against malaria infection. The function of ficolin-A was analyzed in mouse model. The open reading frame of ficolin-A was cloned from the liver of new born C57BL/6 mice by RT-PCR and then inserted into the expression vector of eukaryon to construct p VAX1-ficolin-A plasmid. Meanwhile, the open reading frame of the 19-kDa fragment of merozoite surface protein-1 of Plasmodium berghei [MSP1[19]] was cloned and then the expression vector of eukaryon, p VAX1- MSP1[19] was constructed. Both recombinant vectors were used in the mouse model of infection by Plasmodium berghei. p VAX 1-ficolin-A alone could not significantly suppress parasite density and prolong survival time of infection mice; however, when injected p VAX1-ficolin-A and p VAX1- MSP1[19] together, the percent of invasion by Plasmodium was decreased [from 43.78% to 22.23% at 10 day after infection, compared to vector] and the survival time was prolonged significantly in the infection mouse model [P=0.01]. Ficolin-A can enhance the immunoprotection of MSP1[19], it implies ficolin-A may be used as immunoenhancer in the study of vaccine defending malaria