title: Effect of a novel steroid (PM-9) on the inhibition of 5alpha-reductase present in Penicillium crustosum broths.
abstract: The conversion of testosterone (T) to 5alpha-dihydrotestosterone (DHT) has been demonstrated in Penicillium crustosum broth obtained from fermented pistachios, lemons and corn tortillas. Furthermore, the presence of 5alpha-reductase enzyme, which is responsible for this conversion, has been established by electrophoretical techniques in these cultures.5alpha-Reductase enzyme is also present in animal and human androgen-dependent tissues as well as in prostate and seminal vesicles. The increase of the conversion of T to DHT in prostate gland, has been related to some illnesses such as benign prostate hyperplasia and prostate cancer. Furthermore, treatment with 5alpha-reductase inhibitors such as finasteride reduces the prostate growth. These data have stimulated research for the synthesis of new molecules with antiandrogenic activity, whose biological effect needs to be demonstrated. The purpose of this study is to determine the inhibition pattern of 5alpha-reductase in P. crustosum by finasteride and the new steroidal compound PM-9. K(m) and V(max) values for T, were determined in the broths by Lineweaver-Burk plots using different testosterone concentrations. The inhibition pattern of finasteride and PM-9 was also determined by Lineweaver-Burk using different concentrations of T and inhibitors. Results show that finasteride and PM-9 inhibit 5alpha-reductase present in the broth in a competitive manner.
authors.affiliation: Department of Biological Systems, Metropolitan University-Xochimilco, Calzada Del Hueso No. 1100, 04960, Mexico, D.F., Mexico.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Flores
authors.forename: Marisa
authors.initials: M
authors.lastname: Cabeza
authors.forename: Alexandra
authors.initials: A
authors.lastname: Quiroz
authors.forename: Eugene
authors.initials: E
authors.lastname: Bratoeff
authors.forename: Genoveva
authors.initials: G
authors.lastname: García
authors.forename: Elena
authors.initials: E
authors.lastname: Ramírez
mesh_terms: D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase / Q000378:metabolism; D058891:5-alpha Reductase Inhibitors; D000726:Androgen Antagonists / Q000494:pharmacology; D001711:Biotransformation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D018120:Finasteride / Q000494:pharmacology; D007700:Kinetics; D010407:Penicillium / Q000201:enzymology* / Q000378:metabolism; D011282:Pregnenediones / Q000494:pharmacology*; D013739:Testosterone / Q000378:metabolism
chemical_list: C473847:4-bromo-17alpha-(p-fluorobenzoyloxy)-4-pregnene-3,20-dione; D058891:5-alpha Reductase Inhibitors; D000726:Androgen Antagonists; D004791:Enzyme Inhibitors; D011282:Pregnenediones; D013739:Testosterone; D018120:Finasteride; D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase