Serotonin, GnRH-A, and dopamine interaction in the control of in vivo luteinizing hormone release in Prussian carp (Carassius gibelio Bloch) at the time of gonad recrudescence

M. Sokolowska-Mikolajczyk, D. Gajdzinski, G. Gosiewski and M. Socha
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M. Sokolowska-Mikolajczyk: Department of Ichthyobiology and Fisheries, University of Agriculture, Krakow-Mydlniki, Poland
D. Gajdzinski: Department of Ichthyobiology and Fisheries, University of Agriculture, Krakow-Mydlniki, Poland
G. Gosiewski: Department of Ichthyobiology and Fisheries, University of Agriculture, Krakow-Mydlniki, Poland
M. Socha: Department of Ichthyobiology and Fisheries, University of Agriculture, Krakow-Mydlniki, Poland

Czech Journal of Animal Science, 2015, vol. 60, issue 2, 45-51

Abstract: The effects of serotonin (5-HT), GnRH analogue (D-Ala6 LHRH, GnRH-A) and dopamine antagonist - pimozide (PIM), on luteinizing hormone (LH) release in mature Prussian carp female (Carassius gibelio Bloch) were examined at the time of gonad recrudescence. Fish were intraperitoneally injected with 5-HT (10 mg/kg), GnRH-A (20 μg/kg) or PIM (5 mg/kg) or the combinations: 5-HT+GnRH-A, 5-HT+PIM, 5-HT+GnRH-A+PIM. Before the injection and 3, 6, 12 or 24 h after treatment blood samples were collected for LH levels determination by ELISA method. The analysis of LH concentrations, expressed as the percentage of pre-treatment, showed that serotonin alone had no influence on the spontaneous LH release, however the additive effects of serotonin and GnRH-A was observed. Serotonin potentiated the GnRH-A-stimulated LH release and potentiated also the effect of PIM. Extremely strong response to PIM and also to the combination with GnRH-A masked the participation of serotonin in the process of LH release in fish with recrudescing gonads. The interaction of serotonin GnRH-A and PIM in the control of LH release is discussed.

Keywords: gonadotropin-releasing hormone analoque; LH; pimozide - dopamine antagonist; serotonin (search for similar items in EconPapers)
Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:60:y:2015:i:2:id:7973-cjas

DOI: 10.17221/7973-CJAS

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