Hormonal Alteration of Synaptic Input to Mauthner Cells of the Adult Male Red-Bellied Newts

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Hormonally induced changes in synaptic inputs to Mauthner cells (M cells) were examined in adult male red-bellied newts, Cynops pyrrhogaster. Hypophysectomized, castrated newts were treated with saline, prolactin, testosterone propionate or both prolactin and testosterone propionate every other day for three weeks. The medulla oblongata containing M cells was examine at ultrastructural level. In the hypo-physectomized, castrated newts treated with prolactin, testosterone propionate or both prolactin and test-osterone propionate, the mean number of synapses onto somata of M cells were significantly larger than that in the hypophysectomized, castrated animals treated with saline. There were no differences in the parameter among the prolactin-, testosterone propionate- and both prolactin and testosterone propionate-treated animals. These finding suggest that prolactin and androgen are critical for maintaining reorganization of synaptic inputs to somata of M cells in the adult male newts.
社団法人日本動物学会の論文