Differences in the dopaminergic reward system in rats that passively and actively behave in the Porsolt test
| Autor: | Paweł Krząścik, Janusz Szyndler, Monika Liguz-Lecznar, Alicja Sobolewska, Aleksandra Wisłowska-Stanek, Marek Gryz, Anna Skórzewska, Karolina Kołosowska, Adam Płaźnik, Danuta Turzyńska, Małgorzata Lehner |
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| Rok vydání: | 2018 |
| Předmět: |
Male
Restraint Physical medicine.medical_specialty Dopamine Individuality Context (language use) Nerve Tissue Proteins Nucleus accumbens Biology Amygdala Synaptic Transmission Nucleus Accumbens 03 medical and health sciences Behavioral Neuroscience Random Allocation 0302 clinical medicine Reward Internal medicine medicine Animals Ultrasonics Rats Wistar Amphetamine Swimming 030304 developmental biology 0303 health sciences Appetitive Behavior Psychological Tests Dopaminergic Conditioned place preference Endocrinology medicine.anatomical_structure Hypothalamus Vocalization Animal 030217 neurology & neurosurgery Stress Psychological medicine.drug Paraventricular Hypothalamic Nucleus |
| Zdroj: | Behavioural brain research. 359 |
| ISSN: | 1872-7549 |
| Popis: | The aim of the study was to assess appetitive responses and central dopaminergic neurotransmission in passive and active rats divided according to their immobility time in the Porsolt swim test and exposed to restraint stress. Passive rats had more episodes of appetitive 50-kHz ultrasonic vocalization (USV) during rat encounter after social isolation and spent significantly more time in the amphetamine-associated context in conditioned place preference test, compared to active rats. Restraint stress decreased sucrose preference, but increased appetitive vocalization and reinforced the conditioned place preference only in passive animals that was associated with increased dopamine concentration in the amygdala. Restraint stress increased also the level of Cocaine- and Amphetamine Regulated Transcript (CART) peptide, a neuromodulator linked to dopamine neurotransmission, in the central nucleus of amygdala, while decreasing it the nucleus accumbens shell in passive rats. In the parvocellular region of paraventricular nucleus of the hypothalamus passive animals had a higher expression of CART compared to passive restraint rats and active control rats. The obtained results show that active and passive rats in the Porsolt test differ significantly in response to appetitive stimuli, which can be additionally changed under stress conditions. The underlying mechanisms are probably associated with differences in dopaminergic activity and CART signaling in reward system. |
| Databáze: | OpenAIRE |
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