Polyclonal-monoclonal elisa assay for detecting n-terminus...

C - Chemistry – Metallurgy – 07 – K

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C07K 16/26 (2006.01) G01N 33/74 (2006.01)

Patent

CA 2511680

A specific and sensitive in vitro ELISA assay and diagnostic test kit is disclosed for determining levels of NT-proBNP protein in a variety of bodily fluids, non-limiting examples of which are blood, serum, plasma, urine and the like. The NT-proBNP ELISA assay test employs the sandwich ELISA technique to measure circulating NT-proBNP in human plasma. In order to obtain antibodies with specific binding properties for targeted amino acid sequences within human proBNP, recombinant human proBNP (or rhproBNP) was expressed and purified for use as an immunogen. Polyclonal antibodies (PAb) to specific amino acid sequences were subsequently purified from goat serum by sequential affinity purification. Monoclonal antibodies were raised against specific polypeptides. Recombinant human NT-proBNP (or rhNT-proBNP) was expressed and purified in order to obtain material for use in calibration of a quantitative method for measurement of human NT-proBNP.

L'invention concerne un test ELISA in vitro spécifique et sensible et un kit de test de diagnostic servant à la détermination de niveaux de protéines NT-proBNP dans une variété de liquides biologiques comprenant, à titre d'exemples non limitatifs : le sang, le sérum, le plasma, l'urine et analogues. Le test Elisa NT-proBNP utilise la technique sandwich ELISA pour mesurer la circulation de NT-proBNP dans le plasma humain. En vue d'obtenir des anticorps à propriétés de liaison spécifiques pour des séquences aminoacides ciblées dans le proBNP humain, le proBNP humain recombinant (ou rhproBNP) est exprimé et purifié pour l'utilisation comme immunogène. Des anticorps polyclones (Pab) vis-à-vis de séquences aminoacides spécifiques sont ensuite purifiés du sérum de chèvre par purification par affinité séquentielle. Des anticorps monoclones sont produits contre des polypeptides spécifiques. Le NT-proBNP humain recombinant (ou rhNT-proBNP) est exprimé et purifié en vue d'obtenir un produit destiné à être utilisé dans l'étalonnage d'un procédé quantitatif de mesure de NT-proBNP humain.

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