Cleavage of 5.alpha.-reductase mrna

C - Chemistry – Metallurgy – 07 – H

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C07H 21/02 (2006.01) A61K 31/70 (2006.01) A61K 48/00 (2006.01) C12N 9/22 (2006.01) C12N 15/11 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2194960

The steroid enzyme 5.alpha.-reductase is responsible for the conversion of testosterone to the more-potent androgen dihydrotestosterone (DHT). The catalytic cleavage of nucleic acid encoding 5.alpha.-reductase by a ribozyme which selectively recognizes such nucleic acid reduces the level of expression of 5.alpha.-reductase by mammalian cells including human cells treated with such ribozyme. The reduction of nucleic acid (e.g. mRNA) levels leads to a corresponding reduction of enzyme levels and dihydrotestosterone levels in surrounding tissues, thus providing a therapeutic effect. The transformation of 5.alpha.-reductase producing cells with an expression vector containing a structural gene for a ribozyme is shown to decrease 5.alpha.-reductase expression. Pharmaceutical compositions and methods useful for topically administering effective amounts of such a ribozyme to hair follicle cells also are exemplified.

L'enzyme 5.alpha.-réductase stéroïdienne est responsable de la conversion de la testostérone en une dihydrotestostérone (DHT) androgène plus puissante. Le clivage catalytique de l'acide nucléique codant la 5.alpha.-réductase à l'aide d'un ribozyme reconnaissant sélectivement cet acide nucléique réduit le niveau d'expression de la 5.alpha.-réductase par les cellules mammifères, y compris les cellules humaines, traitées avec ce ribozyme. La réduction des niveaux d'acide nucléique (p.ex. l'ARNm) entraîne une réduction correspondante des niveaux d'enzymes et des niveaux de dihydrotestostérone dans les tissus environnants, créant ainsi un effet thérapeutique. La transformation des cellules produisant la 5.alpha.-réductase avec un vecteur d'expression contenant un gène structural d'un ribozyme s'avère réduire l'expression de la 5.alpha.-réductase. L'invention se rapporte également à des compositions pharmaceutiques et à des procédés utiles pour administrer localement des doses efficaces de ce ribozyme dans les cellules du follicule pileux, à titre d'exemple d'illustration.

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