Forms of prostate specific antigen (psa) specific for benign...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 9/64 (2006.01) C07K 16/40 (2006.01) C12N 5/12 (2006.01) G01N 33/68 (2006.01) A61K 35/12 (2006.01) A61K 48/00 (2006.01)

Patent

CA 2371577

A substantially pure and isolated novel form of prostate specific antigen (PSA) is provided. The novel form of PSA of the present invention comprises at least one clip at Lys 182 of the amino acid sequence of a mature form of PSA. Preferably, the novel form of PSA additionally comprises one or more clips at a location selected from a group consisting of Ile 1, Lys 145, and Lys 146. More preferably, the form of PSA contains at least two clips at Lys 145 and Lys 182 of the amino acid sequence of a mature form of PSA. The novel forms of PSA exist at an elevated level in patients suspected of having benign prostatic hyperplasia (BPH) and therefore may be used as a serum mark or an immunohistological marker to help distinguish BPH from prostate cancer. Antibodies recognozing the novel forms of PSA and immunoassays that detect and determine the novel forms of PSA of the present invention in a sample are also provided. Further provided are a kit and a method for detecting the novel forms of PSA for aiding in the differentiation of prostate cancer from BPH.

L'invention concerne une forme nouvelle sensiblement pure et isolée de l'antigène prostatique spécifique (APS). La nouvelle forme d'APS de la présente invention comprend au moins un "clip" dans Lys 182 de la séquence d'acides aminés de la forme mure d'APS. En outre, la nouvelle forme d'APS comprend de préférence un ou plusieurs "clips" dans un endroit sélectionné à partir d'un groupe constitué de IIe 1, de Lys 145 et de Lys 146. La forme d'APS comprend, si possible, au moins deux "clips" dans Lys 145 et Lys 182 de la séquence d'acides aminés d'une forme mûre d'APS. Les nouvelles formes d'APS sont présentes à des taux élevés chez les patients susceptibles d'avoir une hyperplasie prostatique bénigne (HPB); de ce fait, elles peuvent être utilisées comme un marqueur sérique ou comme un marqueur immunohistologique aidant à distinguer HPB du cancer de la prostate. L'invention concerne aussi des anticorps reconnaissant les nouvelles formes d'APS et des immuno-essais qui détectent et déterminent la nouvelle forme d'APS de la présente invention dans un échantillon. L'invention concerne en outre un kit et un procédé pour détecter les nouvelles formes d'APS pour faciliter la différentiation de l'HPB du cancer de la prostate.

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