POSSIBLE ROLE OF KISSPEPTIN IN TESTOSTERONE-INDEPENDENT REGULATION OF SEXUAL MOTIVATION IN MALE RATS

Kisspeptin is the peptide product of the KiSS-1 gene and endogenous agonist for the Kiss1 receptor. It is known that kisspeptin, acting centrally, stimulates secretion of gonadoliberin (GnRH). Kisspeptin interacts with other neuropeptides such as neurokinin B and dynorphin, to regulate GnRH pulse generation and also plays a role in sexual behaviour. In this study 50 copulation naive male Wistar rats divided into 5 groups received saline, buserelin acetate (GnRH analogue) (20 μg), kisspeptin-10 (3 ng) intranasally, kisspeptin-10 (30 ng) intraperitoneally and Yoquimbine 200 µg. Behavioural effects were registered in the open-field reward-proximity chamber with the female in estrous phase of cycle over the transparent perforated wall for 10 minutes in red light. Blood samples were collected 30 min after the substance administration from tail vein. Testosterone concentrations were measured using ELISA. All animal groups were compared one to another by the ANOVA test and correspondent "post hoc" paired tests of Newman-Kruskall- Wallis test and Dunn's test. Intranasal administration of buserelin acetate increased concentration of testosterone but not affect sexual motivation in rats. Intraperitoneal administration of Kisspeptin-10 affect both of testosterone concentration and sexual motivation. Intranasal administration of kisspeptin-10 didn't act testosterone but increased sexual motivation. This study shows that some behavioral effects of kisspeptin can possibly be realized independently of testosterone concentration changes.

OX1R ANTAGONIST SB408124 ACTION AND EXTRAHYPOTHALAMIC CRF IN RATS AFTER PSYCHOTRAUMATIC EXPOSURE

Corticoliberin (CRF) isn't only regulates hypothalamic-pituitary-adrenal axis activity, but also functions as a neurotransmitter in extrahypothalamic brain regions like amygdala, implicated in the emotional responses to stress. The CRF system provides an input to orexin neurons and can modulate the activity of orexinergic neurons in stress response. Some data showed the role of orexin-A in extinction of aversive memory. The orexin system was shown to participate in stress-induced behavior connected with the extended amygdala structures, like central nucleus of the amygdala. The objective was to study the effects of orexin-A antagonist SB-408124 in rats after predator-induced stress using behavioral tests and its effects on CRF level in amygdala. In this study 30 male Wistar rats were used. The animals received an intranasally selective antagonist of Orexin receptor 1 type SB-408124. Posttraumatic stress disorder was modelled by single predator exposure. A group of 10-12 rats were placed in a terrarium with an indian python. 7 days after exposure to the predator, the behavior of animals was tested in the Open Field and Elevated Cross-Maze tests. Free motor activity of animals was studied in the "open field" test. To assess stress, we used the "elevated cross-maze " test. CRF concentrations in brain structures were measured by solid-phase ELISA using the Corticotropin Releasing Factor (CRF) test system. In the group of stressed rats receiving intranasally SB-408124, the time of stay in the light arm was restored, but did not reach the control values, the number of runs was restored to the control level, and the number of grooming acts increased in comparison with both the control group and the stressed animals. In the "open field" in the group of stressed rats receiving saline solution, the number of sniffs and rearing were decreased, but the number of peeks into holes was increased. In the group of stressed rats receiving SB-408124 20 µg intranasally, the number of sniffs was increased and the number of hole peeking decreased in comparison with the stressed rats receiving saline solution. The CRF level in the homogenates of amygdala in stressed rats was lower (0.44±0.07 ng/mg protein vs. 0.61±0.01 ng/mg in the control group). In the intranasal administration of SB408124 group this decrease was not recorded and the CRF level in the amygdala was 0.57±0.01 pg/mg protein. Orexin A antagonist SB-408124 reduced anxiety after psychotraumatic exposure. Predator induced acute psychotraumatic exposure decrease CRF level in the rat's amygdala. Intranasal administration of selective orexin 1 receptor antagonist SB408124 restored it closely to normal and has an anxiolytic effect on animal behaviour.