In infectious diseases, extracellular vesicles (EVs) released from a pathogen or pathogen-infected cells can transfer pathogen-derived biomolecules, especially proteins, to target cells and consequently regulate these target cells. For example, malaria is an important tropical infectious disease caused by
Plasmodium spp. Previous studies
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In infectious diseases, extracellular vesicles (EVs) released from a pathogen or pathogen-infected cells can transfer pathogen-derived biomolecules, especially proteins, to target cells and consequently regulate these target cells. For example, malaria is an important tropical infectious disease caused by
Plasmodium spp. Previous studies have identified the roles of
Plasmodium falciparum-infected red blood cell-derived EVs (
Pf-EVs) in the pathogenesis, activation, and modulation of host immune responses. This study investigated the proteomic profiles of
Pf-EVs isolated from four
P.
falciparum strains. We also compared the proteomes of EVs from (i) different EV types (microvesicles and exosomes) and (ii) different parasite growth stages (early- and late-stage). The proteomic analyses revealed that the human proteins carried in the
Pf-EVs were specific to the type of
Pf-EVs. By contrast, most of the
P. falciparum proteins carried in
Pf-EVs were common across all types of
Pf-EVs. As the proteomics results revealed that
Pf-EVs contained invasion-associated proteins, the effect of
Pf-EVs on parasite invasion was also investigated. Surprisingly, the attenuation of parasite invasion efficiency was found with the addition of
Pf-MVs. Moreover, this effect was markedly increased in culture-adapted isolates compared with laboratory reference strains. Our evidence supports the concept that
Pf-EVs play a role in quorum sensing, which leads to parasite growth-density regulation.
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