Autoantigens

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/12 (2006.01) C07K 14/47 (2006.01) C07K 14/715 (2006.01) C12N 15/24 (2006.01) G01N 33/564 (2006.01)

Patent

CA 2237114

A method for detecting patients with rheumatoid arthritis (RA) which comprises acquiring novel antigens with which the RA antibody reacts specifically and using these antigens, and a composition and a kit therefor. A cDNA library is constructed from synovial cells and antigens are screened therefrom with the use of IgG in the synovial fluid of patients with RA. As RA antigens, there are thus isolated a clone A polypeptide which is a novel polypeptide and a follistatin-related protein (FRP) which is a publicly known one but novel as an RA antigen. Antibodies against these polypeptide antigens or derivatives thereof are detected. These polypeptides are usable as a marker for predicting RA or a diagnostic marker.

L'invention concerne une méthode pour détecter chez des patients la polyarthrite rhumatoïde (PR), qui consiste à obtenir de nouveaux antigènes avec lesquels les anticorps de PR réagissent spécifiquement, et à utiliser ces antigènes, ainsi que des compositions et des préparations pour mettre en oeuvre la méthode. On réalise une collection d'ADNc à partir de cellules synoviales et ensuite les antigènes sont identifiés en utilisant les IgG du fluide synovial de patients atteints de PR. Les antigènes PR isolés sont le polypeptide de clone A qui est un polypeptide nouveau et une protéine du type follistatine, qui est connue en soi, mais pas comme antigène de PR. On détecte les anticorps contre ces antigènes polypeptidiques ou leurs dérivés. Ces polypeptides sont utilisables comme marqueurs pour prédire une PR ou comme marqueur diagnostique.

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