Abstract
To explore neuro-endocrinal changes in the brain of European honeybee (Apis mellifera) queens before and after mating, we measured the amount of several biogenic amines, including dopamine and its metabolite in the brain of 6- and 12-day-old virgins and 12-day-old mated queens. Twelve-day-old mated queens showed significantly lower amounts of dopamine and its metabolite (N-acetyldopamine) than both 6- and 12-day-old virgin queens, whereas significant differences in the amounts of these amines were not detected between 6- and 12-day-old virgin queens. These results are explained by down-regulation of both synthesis and secretion of brain dopamine after mating. It is speculated that higher amounts of brain dopamine in virgin queens might be involved in activation of ovarian follicles arrested in previtellogenic stages, as well as regulation of their characteristic behaviors.
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Acknowledgements
We thank the staff of the Laboratory of Entomology and the Honeybee Science Research Center at Tamagawa University for their valued comments, Mrs E. Nishida at the Kanazawa Institute of Technology for helping with maintenance of the HPLC and Dr Robert Hancock for improving English in the manuscript. We also would like to thank the anonymous reviewers for their advisable suggestions.
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Harano, Ki., Sasaki, K. & Nagao, T. Depression of brain dopamine and its metabolite after mating in European honeybee (Apis mellifera) queens. Naturwissenschaften 92, 310–313 (2005). https://doi.org/10.1007/s00114-005-0631-3
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DOI: https://doi.org/10.1007/s00114-005-0631-3