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Parasite Biomass-Related Inflammation, Endothelial Activation, Microvascular Dysfunction and Disease Severity in Vivax Malaria


How vivax parasites cause severe malaria is not known. In contrast to falciparum parasites, the number of vivax parasites circulating in peripheral blood is low, and there is thought to be little sequestration of parasitized red cells within endothelium-lined small blood vessels in vital organs. Total parasite burden (circulating plus hidden) and activation and dysfunction of the endothelial cells lining blood vessels all contribute to severe disease in falciparum malaria, but have not been evaluated in severe vivax malaria. We measured parasite lactate dehydrogenase (pLDH) and P. vivax-pLDH (PvLDH) as proxies of total parasite biomass and found that, as in falciparum malaria, the total biomass of vivax parasites is underestimated by counting parasites circulating in peripheral blood, suggesting a hidden burden of vivax parasites. Markers of total vivax biomass were strongly associated with illness-severity and inflammatory cytokines, suggesting that this hidden burden is capable of contributing to generalised inflammation and hence severe disease. Number of peripheral vivax parasites, but not total biomass, correlated with activation of endothelial cells, suggesting that the hidden vivax-infected red cells may accumulate in parts of organs without endothelium, such as the slow-circulation of the spleen or non-blood-vessel parts of the bone marrow. Severe vivax malaria was associated with increased endothelial activation and impaired microvascular function, suggesting that these processes also contribute to impaired blood flow and disease.


Vyšlo v časopise: Parasite Biomass-Related Inflammation, Endothelial Activation, Microvascular Dysfunction and Disease Severity in Vivax Malaria. PLoS Pathog 11(1): e32767. doi:10.1371/journal.ppat.1004558
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1004558

Souhrn

How vivax parasites cause severe malaria is not known. In contrast to falciparum parasites, the number of vivax parasites circulating in peripheral blood is low, and there is thought to be little sequestration of parasitized red cells within endothelium-lined small blood vessels in vital organs. Total parasite burden (circulating plus hidden) and activation and dysfunction of the endothelial cells lining blood vessels all contribute to severe disease in falciparum malaria, but have not been evaluated in severe vivax malaria. We measured parasite lactate dehydrogenase (pLDH) and P. vivax-pLDH (PvLDH) as proxies of total parasite biomass and found that, as in falciparum malaria, the total biomass of vivax parasites is underestimated by counting parasites circulating in peripheral blood, suggesting a hidden burden of vivax parasites. Markers of total vivax biomass were strongly associated with illness-severity and inflammatory cytokines, suggesting that this hidden burden is capable of contributing to generalised inflammation and hence severe disease. Number of peripheral vivax parasites, but not total biomass, correlated with activation of endothelial cells, suggesting that the hidden vivax-infected red cells may accumulate in parts of organs without endothelium, such as the slow-circulation of the spleen or non-blood-vessel parts of the bone marrow. Severe vivax malaria was associated with increased endothelial activation and impaired microvascular function, suggesting that these processes also contribute to impaired blood flow and disease.


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Hygiena a epidemiológia Infekčné lekárstvo Laboratórium

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