Novel steroid 5 .alpha.-reductase

C - Chemistry – Metallurgy – 12 – Q

Patent

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Details

C12Q 1/68 (2006.01) C12N 9/02 (2006.01) C12N 15/861 (2006.01) G01N 33/574 (2006.01)

Patent

CA 2608068

The invention provides an isolated, novel steroid 5.alpha.-reductase enzyme termed SRD5AIIL The protein has an estimated molecular weight of 37 kDa and is capable of converting testosterone to dihydrotestosterone at a pH of about 7Ø Also provided is a method for identifying inhibitors of SRD5 AIII by contacting SRD5 AIII with a test compound and measuring the activity of the enzyme. A reduced activity relative to a control indicates that the test compound is an inhibitor of SRD5AIII. A method is also provided for detecting androgen stimulated prostate cancer or recurrent prostate cancer in an individual. The method comprises obtaining a prostate biopsy from an individual and determining the level of expression of SRD5ADI gene or protein relative to a normal control. An increased expression of SRD5AIII relative to the control is indicative of androgen stimulated prostate cancer or recurrent prostate cancer.

L'invention concerne une nouvelle enzyme 5a-stéroïde-réductase désignée SRD5AIIL et isolée. La protéine a un poids moléculaire évalué de 37 kDa et est apte à convertir la testostérone en dihydrotestostérone pour un pH d'environ 7,0. L'invention concerne également un procédé d'identification d'inhibiteurs de la SRD5 AIII en mettant en contact la SRD5 AIII avec un composé test et en mesurant l'activité de l'enzyme. Une activité réduite par rapport à un témoin indique que le composé test est un inhibiteur de la SRD5AIII. L'invention concerne également la détection d'un cancer de la prostate à stimulation par androgène ou un cancer de la prostate récurrent chez un individu. Ce procédé consiste à effectuer une biopsie de la prostate chez un patient et à déterminer le niveau d'expression du gène SRD5ADI ou de la protéine par rapport à un témoin normal. Une expression accrue de SRD5AIII par rapport au témoin est l'indication d'un cancer de la prostate à stimulation par androgène ou d'un cancer de la prostate récurrent.

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