Test kit and method of diagnosing severe acute pancreatitis

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Patent

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Details

G01N 33/535 (2006.01) C07K 16/40 (2006.01) G01N 33/53 (2006.01) G01N 33/543 (2006.01) G01N 33/573 (2006.01) G01N 33/68 (2006.01)

Patent

CA 2351885

A method of in vitro diagnosing severe acute pancreatitis, monoclonal antibodies binding to carboxypeptidase B activation peptide (CAPAP) having SEQ ID NO:1 (aa 1 - 81) or fragments thereof, and a test kit, preferably a dipstick, are described. The method comprises A) bringing a sample of body fluid into contact with a) a first antibody binding to the CAPAP of SEQ ID NO:1, and b) a second antibody binding to the CAPAP of SEQ ID NO:1, other than the side in a), or c) a solid-phase bound CAPAP of SEQ ID NO:1 or fragments thereof, wherein one of the antibodies of a) and b) or the peptide of c) is labeled with a non-radioactive label, and wherein at least one of the antibodies of a) and b) is monospecific for CAPAP, and B) determining the level of antibody-antigen-antibody complex formed, or the level of an excess component in the competitive antigen-antibody reaction, and C) using the determined level for estimation of the amount of CAPAP in the sample for the diagnosis of severe acute pancreatitis in the patient.

L'invention concerne un procédé permettant de diagnostiquer in vitro une pancréatite aiguë sévère, des anticorps monoclonaux se fixant sur les peptides d'activation de la carboxypeptidase B (CAPAP) présentant la séquence SEQ ID NO:1 (aa 1 81) ou des fragments de ces derniers, et un ensemble de test, se présentant de préférence sous forme d'une bandelette réactive. Ce procédé comprend les étapes suivantes: A) on met en contact un échantillon de fluide corporel avec a) un premier anticorps se fixant sur les peptides CAPAP présentant la SEQ ID NO:1, et b) un second anticorps se fixant sur les CAPAP présentant la SEQ ID NO:1, en un site différent de a), ou c) un CAPAP présentant la SEQ ID NO:1 ou des fragments de celui-ci, fixés sur un support solide, un des anticorps a) et b) ou le peptide c) étant marqué au moyen d'un marqueur non radioactif, et au moins un des anticorps a) et b) étant monospécifique de CAPAP; et B) on mesure la concentration de complexe anticorps-antigène-anticorps formé ou la concentration d'un composant excédentaire dans la réaction compétitive antigène-anticorps et C) on utilise les valeurs correspondant à la concentration de CAPAP dans l'échantillon pour diagnostiquer une pancréatite aiguë sévère chez le patient.

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