title: Anastrozole improved testosterone-induced impairment acquisition of spatial learning and memory in the hippocampal CA1 region in adult male rats.
abstract: Neurohormones like testosterone and estrogen have an important role in learning and memory. Many biological effects of androgens in the brain require the local conversion of these steroids to an estrogen. The current research has conducted to assess the effect of testosterone, estrogen and aromatase inhibitor (anastrozole) on spatial discrimination of rats, using Morris water maze and also the pathway of the effect of testosterone by using anastrozole. Adult male rats were bilaterally cannulated into CA1 region of hippocampus and divided into 15 groups. Different groups received DMSO 0.5 microl and DMSO 0.5 microl + DMSO 0.5 microl as control groups and different doses of testosterone enanthate (TE) (20, 40 and 80 microg/0.5 microl), estradiol valerat (EV) (1, 2.5, 5, 10, and 15 microg/0.5 microl), anastrozole (An) (0.25, 0.5, 1 microg/0.5 microl), TE 80 microg/0.5 microl + anastrozole 0.5 microg/0.5 microl and EV 15 microg/0.5 microl + anastrozole 0.5 microg/0.5 microl all days before training. TE and EV were injected 30-35 min before training and anastrozole was injected 25-30 min before training. Our results have shown both TE 80 microg/0.5 microl and EV 15 microg/0.5 microl groups increase in escape latency and traveled distance to find invisible platform. Also we have shown that anastrozole dose dependently decreases escape latency and traveled distance. We resulted that both TE and EN impaired acquisition of spatial learning and memory but anastrozole improved it. Anastrozole also could be buffered TE-induced impairment effect but not EV.
authors.affiliation: Department of Physiology and Pharmacology, Pasteur Institute of Iran, Pasteur Avenue, 13164 Tehran, Iran; Department of Physiology, Tarbiat Modares University, P.O. Box 14115-116, Tehran, Iran.
authors.forename: Farshad
authors.initials: F
authors.lastname: Moradpour
authors.forename: Nasser
authors.initials: N
authors.lastname: Naghdi
authors.forename: Yaghob
authors.initials: Y
authors.lastname: Fathollahi
mesh_terms: D000704:Analysis of Variance; D000077384:Anastrozole; D000818:Animals; D047072:Aromatase Inhibitors / Q000494:pharmacology*; D004193:Discrimination Learning / Q000187:drug effects* / Q000502:physiology; D004924:Escape Reaction / Q000187:drug effects / Q000502:physiology; D004958:Estradiol / Q000008:administration & dosage / Q000031:analogs & derivatives; D006624:Hippocampus / Q000187:drug effects* / Q000201:enzymology; D008297:Male; D018782:Maze Learning / Q000187:drug effects* / Q000502:physiology; D008569:Memory Disorders / Q000139:chemically induced / Q000201:enzymology; D008845:Microinjections; D009570:Nitriles / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D011930:Reaction Time / Q000187:drug effects / Q000502:physiology; D013037:Spatial Behavior / Q000187:drug effects / Q000502:physiology; D018709:Statistics, Nonparametric; D013739:Testosterone / Q000008:administration & dosage / Q000502:physiology*; D014230:Triazoles / Q000494:pharmacology*
chemical_list: D047072:Aromatase Inhibitors; D009570:Nitriles; D014230:Triazoles; D000077384:Anastrozole; D013739:Testosterone; D004958:Estradiol