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Journal Article 2010; 31(5): 622-630 PubMed PMID: 21173744 Citation  Keywords:  Animals, Anxiety:drug therapy, Behavior, Animal:drug effects, Delayed-Action Preparations:administration & dosage, Injections, Intraperitoneal, Locomotion:drug effects, Male, Maze Learning:drug effects, Motor Activity:drug effects, Oxytocics:administratio.   

OBJECTIVES: Carbetocin (CBT), an oxytocin (OXY) analog, was designed to exert prolonged peripheral actions. It has also been proposed as potential therapeutic mean in certain psychiatric disorders where OXY role has been implicated. This study examined the effects of both peptides on behavior of naive and restraint stress exposed rats in the open field (OF) and elevated plus maze (EPM) tests.

METHODS: Spontaneous behavior in the OF and EPM was measured in Wistar rats after intraperitoneal (i.p.) application of OXY or CBT and/or repeated restraint stress. Behavioral parameters were recorded and subsequently elaborated by an automated activity monitoring system (AnyMaze, Stoelting, U.S.A.). Changes in the total movement distance (TMD) and movement in the center area (CMD) were postulated as indicators of the anxiety level.

RESULTS: OXY (0.05 mg/kg) and CBT (0.3 mg/kg) increased TMD but not CMD 60 min after the i.p. treatment; the increased locomotion/exploration indicate participation of arousal/vigilance. Daily stress exposures for three consecutive days, followed by behavioral tests, reduced locomotion of rats in OF and EPM tests; OXY and CBT partly prevented these effects. Five days after the last stress, rats exhibited an increase of both TMD and CMD in the OF. CBT but not OXY prevented these long-term post-stress changes. In the EPM the stressed rats exhibited an increase in time spent in open arms; CBT accelerated this time development. Similar prevention of stress behavioral sequel in OF were obtained in study when stress and peptides were applied for three consecutive days but behavioral testing was postponed for several days to determine the long-lasting effects. CBT reduced the developed locomotor enhancement (6-11 days post-stress) irrespectively whether injected before or after stress.

CONCLUSIONS: Repeated restraint stress exposure produced acute and persisting effects on Wistar rat behavior in the OF and EPM tests. CBT either injected before or after stress practically abolished the developed changes in the mobility parameters. The CBT effectiveness to ameliorate the late post-stress behavioral alteration supports the notion of its therapeutic potential in psychiatric disorders in which the role of OXY has been implicated....

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Clinical Trial 2002; 23(5-6): 455-458 PubMed PMID: 12500172 Citation  Keywords:  Adult, Auditory Threshold, Delayed-Action Preparations:administration & dosage, Estradiol:administration & dosage, Female, Follicle Stimulating Hormone:blood, Follow-Up Studies, Hearing Loss:diagnosis, Hearing Tests, Hormone Replacement Therapy, Humans, M.   

BACKGROUND: Estrogens have not only direct and beneficial effect on relaxation of the arteries increasing the blood flow in the blood vessels, but also their level of secretion has considerable effect on synthesis of acetylcholine a neurotransmitter indispensable for appropriate functioning of the hearing organ. The aim of this study is analysis of the effect of hormones on the hearing organ in women who underwent surgical castration.

MATERIAL: The study included 40 females, aged between 32 55 years who had undergone an operative treatment mainly because of uterine myoma. A group of 50 women aged between 32 50 years with appropriate hormone level comprised the control group.

METHOD: Each woman investigated underwent the following examinations: gynaecological, otolaryngological and laboratory tests, such as: evaluation of levels of estradiol (E) and folliculin stimulating hormone (FSH). The assessment of hearing was carried out using tone and speech audiometry, tympanometry, test registration of auditory brain stem responses (ABR) and otoacoustic emissions (EOAE). The examinations mentioned above are performed in women as initial examinations before surgical treatment and as follow-up examinations 1, 3 and 12 months after the surgery.

RESULTS: The results presented in this paper include initial examinations and follow-ups 3 months after the surgical treatment taking into consideration the correlation with the results of laboratory tests and the results obtained in the control group....

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