Helicobacter pylori adhesin binding group antigen

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/31 (2006.01) A61K 31/70 (2006.01) A61K 35/66 (2006.01) A61K 39/106 (2006.01) A61K 39/40 (2006.01) A61K 48/00 (2006.01) C07K 7/08 (2006.01) C07K 14/205 (2006.01) C07K 16/12 (2006.01) G01N 33/569 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2257826

A novel Helicobacter pylori blood group antigen binding (BAB) adhesin protein was isolated and purified, whereby said protein or fractions thereof bind specifically to fucosylated blood group antigens. The protein sequence of said adhesin is disclosed in this application. Simultaneously the DNA sequences for two genes, babA and babB, producing highly similar proteins, are disclosed. Said adhesin and/or DNA is useful for diagnose and therapy and/or prophylaxis directed against H. pylori induced infections, e.g. gastritis and acid peptic disease, i.e. active vaccination. A new immunoglobulin composition, which exhibits specific activity to a Lewisb antigen binding Helicobacter pylori adhesin, or preferably, monoclonal and/or polyclonal antibodies to said adhesin offer a new and more efficient method of treatment and/or prevention of gastrointestinal diseases, caused by Helicobacter pylori or other Helicobacter species, i.e. passive vaccination.

On a isolé et purifié une nouvelle protéine adhésine d'Helicobacter pylori se fixant à un antigène de groupe sanguin (BAB), ladite protéine ou des fractions de ladite protéine se fixant de façon spécifique à des antigènes fucosylés de groupe sanguin. L'invention décrit la séquence de protéines de ladite adhésine. Elle décrit simultanément les séquences d'ADN pour deux gènes, babA et babB, produisant des protéines extrêmement similaires. Ladite adhésine et/ou ledit ADN sont utiles pour le diagnostic et la thérapie et/ou pour la prophylaxie concernant des infections provoquées par H. pylori, par exemple la gastrite et les troubles peptiques acides, notamment par vaccination active. Une nouvelle composition d'immunoglobulines présentant une activité spécifique vis-à-vis d'une adhésine d'Hélicobacter pylori se fixant à un antigène de Lewis, ou de préférence, des anticorps monoclonaux et/ou polyclonaux de ladite adhésine permettent la mise en oeuvre d'une nouvelle méthode plus efficace de traitement et/ou de prévention des troubles gastro-intestinaux provoqués par Helicobacter pylori ou d'autres espèces Helicobacter, notamment par vaccination passive.

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