Synaptic plasticity and humoral modulation of neuromuscular transmission in the lobster claw opener during the molt cycle |
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| Affiliation: | 1. Çanakkale Onsekiz Mart University, Department of Chemistry, Polymer Synthesis and Analysis Laboratory, Çanakkale 17020, Turkey;2. Çanakkale Onsekiz Mart University, Lapseki Vocational School, Department of Chemistry and Chemical Processing Technologies, Çanakkale, Turkey;1. Dental Materials Science, Faculty of Dentistry, University of Hong Kong, PR China;2. Oral Rehabilitation, Faculty of Dentistry, University of Hong Kong, PR China;3. School of Stomatology, Zhejiang Chinese Medical University, Hangzhou, PR China;1. School of Chemistry and Chemical Engineering, Engineering Institute of Clean Energy and Materials, Guangzhou University, 510006, Guangzhou, Guangdong, China;2. Guangdong Women and Children Hospital, Guangzhou, 510010, China;1. Department of Human Genetics, National Center for Child Health and Development, Tokyo, Japan;2. Division of Immunology, National Center for Child Health and Development, Tokyo, Japan;3. Department of Maternal-Fetal Biology, National Center for Child Health and Development, Tokyo, Japan;4. Department of Systems BioMedicine, National Center for Child Health and Development, Tokyo, Japan;5. Division of Pediatrics, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan;6. Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Science, Fukuoka, Japan;7. Department of Pediatrics, NHO Kumamoto Medical Center, Kumamoto, Japan;8. Department of Pediatrics, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan;9. Pediatric Hematology and Oncology, National Center for Child Health and Development, Tokyo, Japan |
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| Abstract: | 1. Neuromuscular properties of the lobster dactyl opener were studied at different stages of the molt cycle.2. Excitatory junctional potentials (EJPs) were found to be significantly larger in hard-shelled premolt lobsters than in soft-shelled postmolt animals.3. Inhibitory junctional potentials (IJPs) were larger in postmolt claw preparations than in premolt ones.4. Excitatory transmission was also monitored during superfusion with plasma samples obtained from lobsters in vartious stages of the molt cycle (postmolt = AB; intennolt = C; premolt = D2).5. D2 plasma increased EJP amplitude by an average of 28% relative to baseline levels (in saline), while AB plasma reduced EJP size by an average of 6%.6. Premolt and postmolt plasma produced opposite effects on quantal content (m); D2; plasma increased m by a mean of 39%, whereas AB plasma caused a mean reduction by 10%, which suggests that humoral factors may act presynaptically to alter transmitter release.7. These results provide evidence of neuromuscular plasticity in the opener muscle during the molt cycle, and are consistent with changes in claw-opening behavior seen during this cycle. |
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