Specific IgG Response against Mycobacterium avium paratuberculosis in children and adults with Crohn's disease

Julien Verdier (1, 2) , Louis Déroche (1, 2) , Matthieu Allez (3) , Caroline Loy (1, 2) , Franck Biet (4) , Christelle Bodier (4) , Sylvie Bay (5) , Christelle Ganneau (5) , Tamara Matysiak-Budnik (6) , Jean Marc Reyrat (3, 7) , Martine Heyman (1, 2) , Nadine Cerf-Bensussan (1, 2) , Frank M. Ruemmele (1, 2, 8) , Sandrine Ménard (2, 1, 9)

1 UMR 989
2 USPC - Université Sorbonne Paris Cité
3 Dept Gastroenterol
4 UMR ISP - Infectiologie et Santé Publique
5 Chimie des Biomolécules - Chemistry of Biomolecules
6 CHU Nantes - Centre Hospitalier Universitaire de Nantes
7 INSERM - Institut National de la Santé et de la Recherche Médicale
8 AP-HP - Assistance publique - Hôpitaux de Paris (AP-HP)
9 ToxAlim-NGN - Neuro-Gastroentérologie & Nutrition

Background and Aims: Presence of serum antibodies against Mycobacterium avium paratuberculosis (MAP) in Crohn's Disease (CD) as a disease characteristic remains controversial. In the present work, we assessed antibody reactivity of serum and intestinal fluid against four distinct MAP-antigens, including the recently identified MAP-specific lipopentapeptide (L5P). Methods: Immunoglobulin concentrations and specificity against 3 non MAP-specific antigens: glycosyl-transferase-d (GSD), purified protein derivative from MAP (Johnin-PPD), heparin binding haemagglutinin (MAP-HBHA) and one MAP-specific antigen: synthetic L5P were determined by ELISA in gut lavage fluids from adult controls or patients with CD, and in sera of children or adult controls or patients with CD, ulcerative colitis or celiac disease. Results: Total IgA and IgG concentrations were increased in sera of children with CD but were decreased in sera of adults with CD, thereof specificity against MAP antigens was assessed by normalizing immunoglobulin concentrations between samples. In CD patients, IgG reactivity was increased against the four MAP antigens, including L5P in gut lavage fluids but it was only increased against L5P in sera. By contrast, anti-L5P IgG were not increased in patients with ulcerative colitis or celiac disease. Conclusions: A significant increase in anti-L5P IgG is observed in sera of children and adults with CD but not in patients with other intestinal inflammatory diseases. Anti-L5P antibodies may serve as serological marker for CD.

Domaines: Sciences du Vivant [q-bio]

Julien Verdier, Louis Déroche, Matthieu Allez, Caroline Loy, Franck Biet, et al.. Specific IgG Response against Mycobacterium avium paratuberculosis in children and adults with Crohn's disease. PLoS ONE, 2013, 8 (5), ⟨10.1371/journal.pone.0062780⟩. ⟨hal-02645232⟩