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, M. Sochahttps://doi.org/10.17221/7973-CJASCitation:Sokolowska-Mikolajczyk M., Gajdzinski D., Gosiewski G., Socha M. (2015): 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. Czech J. Anim. Sci., 60: 45-51.
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; serotoninReferences:
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