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Immunohistochemical localization of GnRH-immunoreactive cell bodies and fibers in the nerve ganglion of Perinereis aibuhitensis (Annelida: Polychaeta).
Acta Histochemica 2019 January 5
The gonadotropin-releasing hormone (GnRH) gene sequence has been identified in an annelid polychaete marine worm using continual genome sequencing. The distribution of GnRH immunoreactive (ir) cell bodies and fibers in the nerve ganglion of the clam worm Perinereis aibuhitensis (Polychaeta) was examined by immunohistochemistry using a newly produced rabbit polyclonal antibody raised against the marine worm GnRH (mwGnRH). The specificity of the antibody was confirmed by dot blot assay. The antibody cross-reacted with mwGnRH, but not with other forms of GnRH such as octopus GnRH, tunicate GnRH-I, II, owl limpet GnRH, and lamprey GnRH-II. In P. aibuhitensis, mwGnRH-ir cell bodies were detected in the nuclei 15-22, the caudal part of the cerebral ganglion. Furthermore, mwGnRH-ir fibers were mainly observed in the optic neuropil, but mwGnRH-ir fibers were also detected in the central neuropil region, the subpharyngeal ganglion, and the ventral nerve cord. These results indicate that mwGnRH is synthesized in the cerebral ganglion, is transported through the subpharyngeal ganglion and the ventral nerve cord, and functions either as a neurotransmitter or neuromodulator.
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