NDT Advance Access originally published online on November 24, 2006
Nephrology Dialysis Transplantation 2007 22(3):749-755; doi:10.1093/ndt/gfl688
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Lack of specific binding of Shiga-like toxin (verocytotoxin) and non-specific interaction of Shiga-like toxin 2 antibody with human polymorphonuclear leucocytes
1Department of Paediatric Nephrology and 2Department of Nuclear Medicine, Radboud University Nijmegen Medical Centre, PO Box 9101, 6500 HB Nijmegen, The Netherlands
Correspondence and offprint requests to: Leo A. H. Monnens, Radboud University Nijmegen Medical Centre, Department of Pediatric Nephrology, PO Box 9101, 6500 HB Nijmegen, The Netherlands. Email: l.monnens{at}cukz.umcn.nl
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Abstract |
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Background. After gastrointestinal infection with Shiga-like toxin (Stx) producing Escherichia coli, the toxin is transported from the intestine to the renal microvascular endothelium. This is the main target for Stx in humans. Previous studies indicated that polymorphonuclear leucocytes (PMN) could serve as carriers for Stx in the systemic circulation. As at a later stage we could not confirm these data, we performed new studies.
Methods. The binding of Stx1 to PMN was determined in vitro (isolated human PMN and whole blood) and in vivo (injection in mice). The specificity of binding of an antibody against Stx2 to PMN from patients with haemolytic uraemic syndrome (HUS) was determined. This was compared with binding to PMN from healthy controls, and patients after haemodialysis (HD) or on peritoneal dialysis (PD). Furthermore, PMN were incubated with Stx to study possible activation.
Results. No specific binding of Stx1 to PMN could be detected. After intravenous injection of the toxin in mice, it was not associated with PMN. The binding of an antibody against Stx2 to PMN was detected in both patients with HUS and patients after HD, but not in patients on PD. Stx was not able to activate PMN.
Conclusions. PMN are not acting as transporter for Stx in the pathogenesis of HUS. The interaction of a Stx antibody with PMN from HUS patients is not specific as it can also be observed in patients after HD (possibly due to activation of the PMN). Therefore, binding of Stx antibody to PMN is not reliable as a diagnostic tool for HUS.
Keywords: binding experiments; haemolytic uraemic syndrome; polymorphonuclear leucocytes; Shiga-like toxin
Received for publication: 24. 5.06
Accepted in revised form: 25.10.06
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