Extensive Distribution of Galanin-Immunoreactive Neuronal Systems in a Fresh Water Snail, Indoplanorbis exustus, and Partial Coexistence with Choline Acetyltransferase-like Immunoreactivity

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Immunohistochemical techniques were employed to investigate the distribution of galanin-like immunoreactivity in the central nervous system (CNS) of the snail, Indoplanorbis exustus, and immunoreactivity with an antibody against choline acetyltransferase (CAT) in galanin-immunoreactive somata was also examined. Galanin-immunoreactive (Gal-IR) cells were observed in all ganglia. They were classified into large (50 μm), medium (21 μm), and small (13 μm)-sized neurons and small Gal-IR cells dominated over large and medium Gal-IR cells in number. Gal-IR cells were most abundant in the cerebral ganglion. Several immunoreactive somata were seen in the parietal, visceral, and pedal ganglia, and only a few Gal-IR cells in the pleural and buccal ganglia. Densely arranged Gal-IR fiber bundles were observed in the cerebro-pleural, parieto-pleural and bucco-cerebral connectives. Of the peripheral nerves, the pallial and pharyngeal nerves contained more numerous Gal-IR fibers than other peripheral nerves. By Western blot analysis, the galanin antibody detected approximately 6.1 kDa band, suggesting a pre-form or a long form of galanin. Some Gal-IR cells in the cerebral ganglion and a few in the pleural and parietal ganglia were also immunoreactive for CAT. These results indicate that a distinct neuronal system with galanin or galanin-like peptide is present in the CNS of the snail, and suggest that a part of the galanin neuronal system is cholinergic. The peptide may function as a neurotransmitter/neuromodulator and/or neurohormone in the snail.
社団法人日本動物学会の論文
1996-08-15

Extensive Distribution of Galanin-Immunoreactive Neuronal Systems in a Fresh Water Snail, Indoplanorbis exustus, and Partial Coexistence with Choline Acetyltransferase-like Immunoreactivity

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