Abstract
Urinary tract infections (UTI) are common among elderly patients in residential care facilities, as well as in the hospital setting. Identifying new biochemical markers of UTI is an active line of research since UTI management is resource intensive. Paraoxonase-1 (PON1) forms part of the patient’s immune system, the response-to-injury and inflammation. Our study sought to evaluate alterations in inflammation-related paraoxonase-1 (PON1) and chemokine (C-C motif) ligand 2 (CCL2) in patients with an indwelling catheter to assess their potential usefulness as biomarkers of infection. Patients (n = 142) who had had the urinary catheter removed and 100 healthy volunteers were recruited. In all participants we measured serum PON1 activity, PON1 concentration, CCL2, procalcitonin and C-reactive protein (CRP). Results indicated that patients had higher CCL2, CRP and procalcitonin concentrations than the control group, and lower paraoxonase activity. There were no significant differences in PON1 concentrations. When comparing the diagnostic accuracy of CRP, procalcitonin, CCL2 and the PON1-related variables in discriminating between patients with and those without UTI, we found a considerable degree of overlap between groups, i.e., a low diagnostic accuracy. However, there were significant inverse logarithmic correlations between serum paraoxonase activity and the number of days the urinary catheter had been in situ. Our results suggest that measurement of these biochemical variables may be useful in investigating complications of long-term use of these devices and help to improve the economic and clinical investment required in the management of the often-associated infection.
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Abbreviations
- ACI:
-
Acute concomitant infection
- DTNB:
-
5,5′-dithio-bis-2-nitrobenzoic acid
- CAAB:
-
Catheter-associated asymptomatic bacteriuria
- CAUTI:
-
Catheter-associated urinary tract infection
- CCL2:
-
Chemokine (C-C motif) ligand 2
- CRP:
-
C-reactive protein
- PON1:
-
Paraoxonase-1
- ROC:
-
Receiver operating characteristic
- TBBL:
-
5-thiobutyl butyrolactone
- UTI:
-
Urinary tract infection
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Acknowledgments
This study was supported by grants from the Instituto de Salud Carlos III (PI1102817 and PI1100130) and the Fondo Europeo de Desarrollo Regional (FEDER), Madrid, Spain. We thank Dr. Dan Tawfik from the Weizmann Institute of Science (Rehovot, Israel) for the generous gift of the TBBL reagent. Editorial assistance was provided by Dr. Peter R. Turner of t-scimed.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Iftimie, S., García-Heredia, A., Pujol, I. et al. Preliminary study on serum paraoxonase-1 status and chemokine (C-C motif) ligand 2 in hospitalized elderly patients with catheter-associated asymptomatic bacteriuria. Eur J Clin Microbiol Infect Dis 35, 1417–1424 (2016). https://doi.org/10.1007/s10096-016-2679-8
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DOI: https://doi.org/10.1007/s10096-016-2679-8