Abstract
When crayfish have attained dominant status after agonistic bouts, their avoidance reaction to mechanical stimulation of the tailfan changes from a dart to a turn response. Ascending interneurones originating in the terminal ganglion receive sensory inputs from the tailfan and they affect spike activity of both uropod and abdominal postural motor neurones, which coordinates the uropod and abdominal postural movements. Despite the varying output effects of ascending interneurones, the synaptic responses of all interneurones to sensory stimulation were enhanced when they acquired a dominant state. The number of spikes increased as did a sustained membrane depolarizations. Regardless of social status, the output effects on the uropod motor neurones of all interneurones except VE-1 remained unchanged. VE-1 mainly inhibited the uropod opener motor neurones in naive animals, but tended to excite them in dominant animals. Synaptic enhancement of the sensory response of ascending interneurones was also observed in naive animals treated with bath-applied serotonin. However, subordinate animals or naive animals treated with octopamine had no noticeable effect on the synaptic response of their ascending interneurones to sensory stimulation. Thus, enhancement of the synaptic response is a specific neural event that occurs when crayfish attain social dominance and it is mediated by serotonin.
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Abbreviations
- 5HT:
-
Serotonin
- dom:
-
Dominant
- ext:
-
Extensor
- MN:
-
Motor neurone
- OA:
-
Octopamine
- op:
-
Opener
- sub:
-
Subordinate
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This work was supported by Grants-in-Aid from the Ministry of Education, Science, Sport, and Culture to TN (16K07432). We would like to thank Uni-edit for editing and proofreading this manuscript.
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TA and TN designed the experiments. TA conducted the experiments and performed the statistical analyses. TA and TN discussed the results, wrote the paper and approved the final manuscript.
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Abe, T., Nagayama, T. Enhancement of synaptic responses in ascending interneurones following acquisition of social dominance in crayfish. J Comp Physiol A 207, 415–428 (2021). https://doi.org/10.1007/s00359-021-01481-7
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DOI: https://doi.org/10.1007/s00359-021-01481-7