ted atmosphere with 5% CO2 95% air. All cell lines used in this study are authenticated as being ovarian in origin with a writ ten guarantee. Animal experimentation Animal experiments were conducted in accordance with the Guidelines for Animal Experimentation, Hirosaki University. Eight week old female BALB c nu nu mice were used in this study. At the Institute for Animal Experimentation of Hirosaki University, all mice were group housed in plastic cages with stainless steel grid tops, under a 12 hour light dark cycle and consumed water and food ad libitum. Hormone administration and ovariectomy Letrozole was purchased from Novartis Oncology. Letrozole was suspended in distilled water. The experimental mice were divided into two groups containing ten mice each.

The letrozole group was given letrozole 5 mg kg day by oral gavage every day until the end of the study, and the control group was given vehicle. Bilateral ovariectomy was per Centrophenoxine method formed under pentobarbital anesthesia in all experimen tal mice on the seventh day after commencement of letrozole administration. Real time quantitative PCR Total RNA was extracted from the cells using an Illustra RNAspin Mini RNA Isolation Kit. Total RNA served as a template for single strand cDNA synthesis in a reaction using an iScript Advanced cDNA Kit under the conditions with slight modifications. A CFX96 real time PCR detection system was used for the quantitative analyses of ER and glyceraldehyde 3 phosphate dehydrogenase. The sequences of the primers were as follows, The amplification reactions were performed with SsoFast EvaGreen Supermix according to the manu facturers specifications.

The primers were used at 300 nM. The amplification conditions were as follows, 30 sec at 95 C, followed by 95 C for 5 sec and 60 C for 30 sec for 40 consecutive cycles. After amplification, a melting curve 65 C to 95 C at 0. 5 C increments and 5 sec per step was generated with continuous monitoring of fluorescence. The melting curves {read what he said| kinase inhibitor|selleckchem|selelck kinase inhibitor|LDC000067 1073485-20-7 and quantitative analysis of the data were performed using CFX manager Version 2. 1 software. Evaluation of adverse effects following administration of letrozole The nude mice, ovariectomized at the age of nine weeks were given letrozole or its vehicle for five weeks. All mice were weighed every day and the consumption of food was measured daily. Acts of self harm or aggression were also observed.

Mouse model of peritoneal carcinomatosis OVCAR 3 cells or DISS cells were inoculated into the peritoneal cavity of ovariec tomized nude mice in 500 ul of RPMI 1640 medium at the age of nine weeks. The survival times for the letrozole and control groups were evaluated. The survival was com pared until 5 weeks after cell inoculation and surviving mice were euthanized using high dose pentobarbital in order to