Cytokine production is altered in monocytes from children with hemolytic uremic syndrome.

Abstract:

PURPOSE:The interaction of Shiga toxin (Stx) and/or lipopolysaccharide (LPS) with monocytes (Mo) may be central to the pathogenesis of hemolytic uremic syndrome (HUS), providing the cytokines necessary to sensitize endothelial cells to Stx action. We have previously demonstrated phenotypical alterations in Mo from HUS patients, including increased number of CD16+ Mo. Our aim was to investigate cytokine production in Mo from HUS patients. METHODS:We evaluated TNF-α and IL-10 intracellular contents and secretion in the different Mo subsets in mild (HUS 1) and moderate/severe (HUS 2 + 3) patients. As controls, we studied healthy (HC) and infected children (IC). We also studied Mo responsive capacity towards LPS, measuring the modulation of Mo surface molecules and cytokine production. RESULTS:In basal conditions, the intracellular measurement of TNF-α and IL-10 revealed that the highest number of cytokine-producing Mo was found in HUS 2 + 3 and IC, whereas LPS caused a similar increase in TNF-α and IL-10-producing Mo for all groups. However, when evaluating the release of TNF-α and IL-10, we found a diminished secretion capacity in the entire HUS group and IC compared to HC in basal and LPS conditions. Similarly, a lower Mo response to LPS in HUS 2 + 3 and IC groups was observed when surface markers were studied. CONCLUSION:These results indicate that Mo from severe cases of HUS, similar to IC but different to mild HUS cases, present functional changes in Mo subpopulations and abnormal responses to LPS.

journal_name

J Clin Immunol

authors

Fernández GC,Ramos MV,Landoni VI,Bentancor LV,Fernández-Brando RJ,Exeni R,Laso Mdel C,Exeni A,Grimoldi I,Isturiz MA,Palermo MS

doi

10.1007/s10875-011-9646-z

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

622-31

issue

3

eissn

0271-9142

issn

1573-2592

journal_volume

32

pub_type

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