title: Effect of progesterone and its synthetic analogues on the activity of mitochondrial permeability transition pore in isolated rat liver mitochondria.
abstract: The influence of progesterone and its synthetic analogues on the induction of the Ca(2+)-dependent mitochondrial permeability transition pore (MPTP) has been studied. The novel synthetic analogue of progesterone 17a-acetoxy-3b-butanoyloxy-6-methyl-pregna-4,6-diene-20-on (buterol) was compared with progesterone and medroxyprogesterone acetate (MPA). It was found that progesterone and buterol have opposite effects on the induction of MPTP opening by calcium ions. By contrast to progesterone, which decreased the calcium ion concentration necessary for pore opening, and MPA, which also, although at a lesser extent, activated the pore induction, buterol at a concentration of 20-100 microM blocked the pore opening and increased the calcium retention capacity of mitochondria more than twofold. The action of buterol is specific to the pore since it did not affect the respiration, whereas progesterone completely inhibited NAD-dependent respiration. MPA acted similar to progesterone but less effectively. The inhibitory effect of buterol was eliminated in the presence of carboxyatractyloside, which selectively binds the thiol groups of adenylate translocase and prevents the adenine nucleotide binding. These data indicate that buterol interacts with thiol groups, which explains its inhibitory effect not only on the mitochondrial pore but also on the transport system of xenobiotics in tumor cells in which buterol reduces the multidrug resistance.
authors.affiliation: Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya 3, Pushchino, Moscow region 142290, Russia. nfedotcheva@mail.ru
authors.forename: Nadezhda I
authors.initials: NI
authors.lastname: Fedotcheva
authors.forename: Vera V
authors.initials: VV
authors.lastname: Teplova
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Fedotcheva
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Rzheznikov
authors.forename: Nikolai L
authors.initials: NL
authors.lastname: Shimanovskii
mesh_terms: D019326:17-alpha-Hydroxyprogesterone / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002463:Cell Membrane Permeability / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D008297:Male; D017258:Medroxyprogesterone Acetate / Q000737:chemistry / Q000494:pharmacology; D008930:Mitochondria, Liver / Q000187:drug effects* / Q000378:metabolism; D033681:Mitochondrial Membrane Transport Proteins / Q000187:drug effects*; D000083162:Mitochondrial Permeability Transition Pore; D008933:Mitochondrial Swelling / Q000187:drug effects; D015394:Molecular Structure; D010101:Oxygen Consumption / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar
chemical_list: C498329:17alpha-acetoxy-3beta-butanoyloxy-6-methyl-pregna-4,6-dien-20-one; D033681:Mitochondrial Membrane Transport Proteins; D000083162:Mitochondrial Permeability Transition Pore; D019326:17-alpha-Hydroxyprogesterone; D017258:Medroxyprogesterone Acetate; D002118:Calcium