title: Mannan-binding lectin in children with Escherichia coli O157:H7 haemmorrhagic colitis and haemolytic uraemic syndrome.
abstract: Mannan-binding lectin (MBL) triggers complement activation upon binding to microbial surfaces. MBL deficiency has been associated with increased susceptibility to severe bacterial infections. We hypothesized that MBL deficiency may predispose children to Shiga toxin-producing Escherichia coli (STEC) O157:H7 infections and the associated haemolytic uraemic syndrome (HUS). We compared circulating levels of MBL among children with uncomplicated O157:H7 haemorrhagic colitis (HC), patients with O157:H7 HUS, normal and diseases control groups. Circulating MBL concentrations on admission were as follows: 3.22 +/- 2.43 micro g/ml among normal controls (n = 23); 2.90 +/- 2.44 micro g/ml in patients with rotavirus enteritis (n = 10); 2.78 +/- 1.65 micro g/ml in children with HC due to non-STEC bacterial pathogen (n = 15); 2.67 +/- 2.44 micro g/ml in patients with uncomplicated O157:H7 HC (n = 27); 2.80 +/- 2.97 micro g/ml in children with O157:H7 HUS (n = 15); 6.70 +/- 4.49 micro g/ml in patients with chronic renal failure unrelated to O157:H7 infection (n = 6). Higher MBL levels were found in patients with chronic renal failure compared to O157:H7 HC (P < 0.047). However, MBL concentrations <0.5 micro g/ml, which have been associated with MBL deficiency in relation to increased susceptibility to infections, were noted at comparable rates between the different groups (P = NS). Our data does not support that MBL deficiency may predispose to O157:H7 infections nor than the development of diarrhoea associated HUS.
authors.affiliation: Department of Paediatrics, Section of Intensive Care Medicine, Section of Haematology and Oncology and Section of Gastroenterology, Sainte-Justine Hospital, Montreal, Canada. fproulx_01@yahoo.ca
authors.forename: F
authors.initials: F
authors.lastname: Proulx
authors.forename: E
authors.initials: E
authors.lastname: Wagner
authors.forename: B
authors.initials: B
authors.lastname: Toledano
authors.forename: H
authors.initials: H
authors.lastname: Decaluwe
authors.forename: E G
authors.initials: EG
authors.lastname: Seidman
authors.forename: G-E
authors.initials: GE
authors.lastname: Rivard
mesh_terms: D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D003092:Colitis / Q000097:blood / Q000382:microbiology*; D004198:Disease Susceptibility; D019453:Escherichia coli O157; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000097:blood / Q000382:microbiology*; D006463:Hemolytic-Uremic Syndrome / Q000097:blood / Q000382:microbiology*; D006801:Humans; D008297:Male; D037601:Mannose-Binding Lectin / Q000097:blood / Q000172:deficiency*; D012044:Regression Analysis; D018709:Statistics, Nonparametric
chemical_list: D037601:Mannose-Binding Lectin