title: Steroid 5α-reductase as a novel therapeutic target for schizophrenia and other neuropsychiatric disorders.
abstract: The enzyme steroid 5α reductase (S5α R) catalyzes the conversion of Δ⁴-3-ketosteroid precursors--such as testosterone, progesterone and androstenedione--into their 5α-reduced metabolites. Although the current nomenclature assigns five enzymes to the S5α R family, only the types 1 and 2 appear to play an important role in steroidogenesis, mediating an overlapping set of reactions, albeit with distinct chemical characteristics and anatomical distribution. The discovery that the 5α-reduced metabolite of testosterone, 5α-dihydrotestosterone (DHT), is the most potent androgen and stimulates prostatic growth led to the development of S5α R inhibitors with high efficacy and tolerability. Two of these agents, finasteride and dutasteride, have received official approval for the treatment of benign prostatic hyperplasia and are being tested for prevention of prostate cancer. Finasteride is also approved for male-pattern alopecia and has been shown to induce very limited side effects. Over the last decade, converging lines of evidence have highlighted the role of 5α-reduced steroids and their precursors in brain neurotransmission and behavioral regulation. Capitalizing on these premises, we and other groups have recently investigated the role of S5α R in neuropsychiatric disorders. Our preliminary data suggest that S5 R inhibitors may elicit therapeutic effects in a number of disorders associated to dopaminergic hyperreactivity, including psychotic disorders, Tourette syndrome and impulse control disorders. In the present article, we review emerging preclinical and clinical evidence related to these effects, and discuss some of the potential mechanisms underlying the role of S5α R in the pathophysiology of mental disorders.
authors.affiliation: Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, 1985 Zonal Ave PSC 527 Los Angeles, CA 90089, USA. bortolat@usc.ed
authors.forename: Silvia
authors.initials: S
authors.lastname: Paba
authors.forename: Roberto
authors.initials: R
authors.lastname: Frau
authors.forename: Sean C
authors.initials: SC
authors.lastname: Godar
authors.forename: Paola
authors.initials: P
authors.lastname: Devoto
authors.forename: Francesco
authors.initials: F
authors.lastname: Marrosu
authors.forename: Marco
authors.initials: M
authors.lastname: Bortolato
mesh_terms: D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D058891:5-alpha Reductase Inhibitors / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use*; D000818:Animals; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000188:drug therapy* / Q000378:metabolism; D051379:Mice; D058990:Molecular Targeted Therapy; D011470:Prostatic Hyperplasia / Q000188:drug therapy; D011471:Prostatic Neoplasms / Q000201:enzymology / Q000517:prevention & control; D051381:Rats; D012559:Schizophrenia / Q000188:drug therapy* / Q000378:metabolism
chemical_list: D058891:5-alpha Reductase Inhibitors; D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase