Liver-stage development of Plasmodium falciparum, in a humanized mouse model

The Journal of Infectious Diseases
Serban MorosanPierre Druilhe

Abstract

The liver stage of the human malaria parasite Plasmodium falciparum is the least known, yet it holds the greatest promise for the induction of sterile immunity and the development of novel drugs. Progress has been severely limited by the lack of adequate in vitro and in vivo models. Recently, it was found that immunodeficient mice transgenic for the urokinase plasminogen activator allow survival of differentiated human hepatocytes. We confirm this finding but show that hepatocyte survival is short lived unless nonadaptive defenses are simultaneously depleted. By controlling macrophages and NK cells, we readily effected the long-term secretion of human serum albumin and human alpha-1 antitrypsin in mouse serum (at 3 months, the proportion of repopulated mice increased from 0% to 60% and from 22% to 80%, respectively; P<.0001). P. falciparum sporozoites delivered intravenously into mice readily infected transplanted human hepatocytes and developed into liver schizonts. Their size was twice as large as what was seen in vitro and was comparable to that found in humans and chimpanzees. These results emphasize the importance of nonadaptive defenses against xenotransplantation and lead to development of small laboratory models that, b...Continue Reading

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