Carbohydrate-mimetic peptides and use thereof in...

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 14/22 (2006.01) A61K 38/16 (2006.01) G01N 33/68 (2006.01)

Patent

CA 2634067

The present invention is related with the pharmaceutical industry and the biotechnology, specifically with vaccine antigens applied against bacterial, viral, cancerous or another origin diseases. Development of pharmaceuticals formulations able to protect or to increase the protective spectrum of already developed vaccines and to extend it against several pathogens, using as target for the immune response, carbohydrates composed of repeated units of (.alpha. 2-8) linked N-replaced neuraminic acid. Several peptides were isolated and identified as molecular mimetics of the capsular polysaccharide form serogroup B of Neisseria meningitidis, which is composed of repeated units of (.alpha. 2-8) linked N-acetyl neuraminic acid. The immunogenicity of peptides was evaluated in animal biomodels, demonstrating their value as antigens able to induce the production of antibodies able of specifically recognize the bacterium N. meningitidis from serogroup B and of showing bactericidal activity against the same one. The resulting formulations of are applicable in the pharmaceutical industry as vaccine formulations for human use.

La présente invention concerne l'industrie pharmaceutique et la biotechnologie, plus spécifiquement des antigènes vaccinaux administrés contre des maladies bactériennes, virales, cancéreuses, ou d'une autre origine. L'invention concerne également la mise au point de formulations pouvant protéger ou élever le spectre de protection des vaccins déjà existants et l'étendre contre différents agents pathogènes, en utilisant comme cible pour la réponse immune des carbohydrates formés d'unités répétées de (a 2-8) acide neuraminique N-substituées. Des peptides ont été isolés et identifiés comme agents mimétiques moléculaires du polysaccharide capsulaire de Neisseria meningitidis du sérogroupe B, formé d'unités répétées de (a 2-8) acide neuraminique N-acétylé. L'immunogénicité des peptides est évaluée dans des biomodèles animaux, démontrant leur valeur comme antigènes inducteurs d'anticorps pouvant reconnaître de manière spécifique N. meningitidis du sérogroupe B et présenter une activité bactéricide contre celle-ci. Les formulations obtenues de l'invention peuvent être utilisées dans l'industrie pharmaceutique comme des formulations vaccinales destinées aux humains.

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