Calcitonin gene-related peptide-like nervous system in the optic lobe and peduncle complex of the octopus, Octopus vulgaris
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概要
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Calcitonin gene-related peptide (CGRP)-like immunoreactivity was examined in the octopus optic lobe and pedunclule complex by immunohistochemistry and biochemistry. In the optic lobe cortex, CGRP-immunoreactive somata were scattered in the inner granular cell layer but not in the outer granular cell layer. In the optic lobe medulla, scattered CGRP-immunoreactive somata were seen in the cell island and many immunoreactive varicose fibers were observed in the surrounding neuropil. In the peduncle lobe, immunoreactive somata were seen in the cell layer of the basal zone, but not in that layer of the spine. Based on the size of the immunoreactive somata, these CGRP-immunoreactive cells may correspond to the projection neurons from the basal zone to the motor areas of the central brain. Immunoreactive varicose fibers were observed in the basal zone neuropil, but only a few in the spine neruopil. In the olfactory lobe, many immunoreactive somata were seen in the posterior olfactory lobule, but only a few in the median olfactory lobule. We found no immunoreactive somata in the anterior olfactory lobule. However, immunoreactive varicose fibers and puncta were abundant in the neuropils of these three lobules. Western blot analysis indicated that the used anti-rat CGRP antiserum detected an approximate 31.6 kDa band from optic lobe extracts, which may be a precursor form or the active form of a CGRP-like peptide in the octopus. These results suggest that a CGRP-like substance is present in the octopus optic lobe and peduncle complex and that the substance functions as a neuromodulator in the octopus nervous system similar in the vertebrate brain.
- 神奈川歯科大学の論文
- 2005-03-31
著者
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Yamamoto Toshiharu
Department Of Anatomy Shiga University Of Medical Science
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Yamamoto Toshiharu
Department Of Human Biology Kanagawa Dental College
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Suzuki Hirohumi
Department Of Biology Faculty Of Science Toho University
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