Changes in Plasma and Pituitary Prolactin Levels in Toad (Bufo japonicus) Larvae during Metamorphosis(Endocrinology)

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Both plasma and pituitary prolactin (PRL) concentrations in Bufo japonicus tadpoles at various developmental stages were determined by a homologous radioimmunoassay. Plasma PRL levels continued to rise gradually as metamorphosis proceeded, the values at late climax being about 3 times higher than those at the premetamorphic stage. PRL concentrations and the amount of PRL in the pituitary gland also increased during the preclimax period and reached a maximum at mid-climax with a slight decline at the end of metamorphosis. PRL synthesis, as measured by incorporation of [3H]leucine into pituitary PRL in vitro, was relatively low during premetamorphosis, continued to rise throughout the prometamorphic period, reached a maximum at climax and declined at the end of metamorphosis. Taken together, these data indicate that the function of the pituitary gland in toad larvae in terms of PRL secretion is gradually enhanced as metamorphosis progresses. The present results obtained with toad tadpoles and those obtained previously with Rana catesbeiana larvae are discussed, taking the differences in metamorphic pattern between the two species into consideration.
社団法人日本動物学会の論文
1991-02-15