Increased concentrations of the soluble mannose receptor in serum from patients with pneumococcal bacteraemia, and prediction of survival.

Abstract

BACKGROUND:

The soluble mannose receptor (sMR) is a new serum marker of macrophage activation. The aim of the present study was to investigate sMR as a prognostic marker in patients with invasive pneumococcal disease (IPD), and compare it to other inflammatory biomarkers.

METHODS:

Samples from 128 patients with IPD were collected at the time of first positive blood culture and analysed using an in-house sMR assay. Clinical data were retrieved from patient files. The main outcome investigated was in-hospital mortality.

RESULTS:

The median sMR concentration in the entire group of patients was 0.77 mg/L. There was a significant difference in sMR concentration between patients below (n = 92, sMR = 0.82 mg/L) or above (n = 36, sMR = 0.73 mg/L) the age of 75 (p < 0.001). In the entire group there was a significant difference in sMR concentrations between survivors (n = 107, sMR = 0.72 mg/L) and non-survivors (n = 21, sMR = 1.38 mg/L), but for patients 75 years or older this difference was not statistically significant. For prediction of survival sMR seemed most promising (area under the receiver operating characteristic curve (AUC) = 0.79) compared with sCD163 (AUC = 0.70) and CRP (AUC = 0.73). In patients 75 years or older the AUC was lower for all three markers (sMR = 0.56, sCD163 = 0.38, CRP = 0.66).

CONCLUSIONS:

The results of this study designate sMR as a potential new biomarker in infectious disease. Additionally, it emphasizes the importance of research into macrophage malfunction in elderly patients.

• Authors: Sidsel Rødgaard-Hansen, Aisha Rafique, Nina Weis, Christian Wejse, Henrik Nielsen, Svend Stenvang Pedersen, Holger Jon Møller, Gitte Kronborg
• Journal: Infectious diseases (London, England) (Infect Dis (Lond)) Vol. 47 Issue 4 Pg. 203-8 (Apr 2015) ISSN: 2374-4243 [Electronic] England
• PMID: 25650730 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Biomarkers
• Lectins, C-Type
• Mannose Receptor
• Mannose-Binding Lectins
• Receptors, Cell Surface

Topics

• Adolescent
• Adult
• Aged
• Aged, 80 and over
• Bacteremia (blood, epidemiology, mortality)
• Biomarkers (blood)
• Comorbidity
• Female
• Humans
• Lectins, C-Type (blood)
• Male
• Mannose Receptor
• Mannose-Binding Lectins (blood)
• Middle Aged
• Pneumococcal Infections (blood, epidemiology, mortality)
• Prognosis
• Receptors, Cell Surface (blood)
• Young Adult