High frequency of myeloid-derived suppressor cells in sepsis patients, with the granulocytic subtype dominating in Gram-positive cases
© Janols et al.; licensee BioMed Central Ltd. 2014
Published: 3 December 2014
Myeloid-derived suppressor cells (MDSCs) constitute a heterogeneous population of immature myeloid cells that potently suppress immune responses. They were originally identified in cancer patients and have since been reported to occur also in chronic inflammation, autoimmunity and even bacterial infections. Human MDSCs are commonly divided into monocytic (Mo-MDSCs) and granulocytic (PMN-MDSCs) subtypes. To what extent the bona fide cancer MDSCs are representative of the proposed MDSCs found in other diseases is not well known. PMN-MDSCs have previously been found to be enriched among low-density granulocytes (LDGs) in density gradient centrifuged blood.
In this study we analyzed potential MDSCs in sepsis patients with different causative microorganisms, using total peripheral blood as compared to density gradient centrifuged blood.
We conclude that a spectrum of cells with MDSC features are enriched in sepsis, and that microbial origin of sepsis contributes to the substantial interindividual patient variation in MDSC pattern.
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