A Distinct Peripheral Blood Monocyte Phenotype Is Associated with Parasite Inhibitory Activity in Acute Uncomplicated Plasmodium falciparum Malaria

PLoS Pathogens

Panudda Sratongno¹  Pattamawan Chimma¹  David J. Roberts¹  Christian Roussilhon²  Jean-Louis Pérignon²  Ronnatrai Ruangveerayuth²  Kovit Pattanapanyasat³  Pierre Druilhe⁴ 

[1] Bio-medical Parasitology Unit, Institut Pasteur, Paris, France;Center of Excellence for Flow Cytometry, Office for Research and Development, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand;Mae Sot Hospital, Mae Sot, Tak, Thailand;Nuffield Department of Clinical Laboratory Sciences, Oxford, United Kingdom

关键词: Malaria;    Malarial parasites;    Blood;    Parasitic diseases;    Parasitemia;    Cytokines;    Inflammation;    Infectious disease control;   

DOI  :  10.1371/journal.ppat.1000631

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

Monocyte (MO) subpopulations display distinct phenotypes and functions which can drastically change during inflammatory states. We hypothesized that discrete MO subpopulations are induced during malaria infection and associated with anti-parasitic activity. We characterized the phenotype of blood MO from healthy malaria-exposed individuals and that of patients with acute uncomplicated malaria by flow cytometry. In addition, MO defense function was evaluated by an in vitro antibody dependent cellular inhibition (ADCI) assay. At the time of admission, the percentages and absolute numbers of CD16+ MO, and CCR2+CX3CR1+ MO, were high in a majority of patients. Remarkably, expression of CCR2 and CX3CR1 on the CD14high (hi) MO subset defined two subgroups of patients that also differed significantly in their functional ability to limit the parasite growth, through the ADCI mechanism. In the group of patients with the highest percentages and absolute numbers of CD14hiCCR2+CX3CR1+ MO and the highest mean levels of ADCI activity, blood parasitemias were lower (0.14±0.34%) than in the second group (1.30±3.34%; p = 0.0053). Data showed that, during a malaria attack, some patients' MO can exert a strong ADCI activity. These results bring new insight into the complex relationships between the phenotype and the functional activity of blood MO from patients and healthy malaria-exposed individuals and suggest discrete MO subpopulations are induced during malaria infection and are associated with anti-parasitic activity.

【 授权许可】

CC BY