Identification of the major oxidative 3alpha-hydroxysteroid dehydrogenase in human prostate that converts 5alpha-androstane-3alpha,17beta-diol to 5alpha-dihydrotestosterone: a potential therapeutic target for androgen-dependent disease.

Mol Endocrinol 2006 Feb 22;20(2):444-58. Epub 2005 Sep 22.

Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6084, USA.

Androgen-dependent prostate diseases initially require 5alpha-dihydrotestosterone (DHT) for growth. The DHT product 5alpha-androstane-3alpha,17beta-diol (3alpha-diol), is inactive at the androgen receptor (AR), but induces prostate growth, suggesting that an oxidative 3alpha-hydroxysteroid dehydrogenase (HSD) exists. Candidate enzymes that posses 3alpha-HSD activity are type 3 3alpha-HSD (AKR1C2), 11-cis retinol dehydrogenase (RODH 5), L-3-hydroxyacyl coenzyme A dehydrogenase , RODH like 3alpha-HSD (RL-HSD), novel type of human microsomal 3alpha-HSD, and retinol dehydrogenase 4 (RODH 4). In mammalian transfection studies all enzymes except AKR1C2 oxidized 3alpha-diol back to DHT where RODH 5, RODH 4, and RL-HSD were the most efficient. AKR1C2 catalyzed the reduction of DHT to 3alpha-diol, suggesting that its role is to eliminate DHT. Steady-state kinetic parameters indicated that RODH 4 and RL-HSD were high-affinity, low-capacity enzymes whereas RODH 5 was a low-affinity, high-capacity enzyme. AR-dependent reporter gene assays showed that RL-HSD, RODH 5, and RODH 4 shifted the dose-response curve for 3alpha-diol a 100-fold, yielding EC(50) values of 2.5 x 10(-9) M, 1.5 x 10(-9) M, and 1.0 x 10(-9) M, respectively, when compared with the empty vector (EC(50) = 1.9 x 10(-7) M). Real-time RT-PCR indicated that L-3-hydroxyacyl coenzyme A dehydrogenase and RL-HSD were expressed more than 15-fold higher compared with the other candidate oxidative enzymes in human prostate and that RL-HSD and AR were colocalized in primary prostate stromal cells. The data show that the major oxidative 3alpha-HSD in normal human prostate is RL-HSD and may be a new therapeutic target for treating prostate diseases.

Download full-text PDF

Source
http://dx.doi.org/10.1210/me.2005-0287DOI Listing
February 2006
4 Reads

Publication Analysis

Top Keywords

human prostate
12
dehydrogenase rodh
12
rodh
9
rodh rodh
8
10-9 10-9
8
l-3-hydroxyacyl coenzyme
8
rodh rl-hsd
8
prostate rl-hsd
8
coenzyme dehydrogenase
8
prostate diseases
8
retinol dehydrogenase
8
major oxidative
8
3alpha-hydroxysteroid dehydrogenase
8
therapeutic target
8
oxidative 3alpha-hydroxysteroid
8
rl-hsd
7
prostate
7
dehydrogenase
6
dht
5
3alpha-hsd
5

Altmetric Statistics

Similar Publications