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- W2000635748 abstract "Abstract Rana pipiens tadpoles were given six injections (over an 11-day period) of either prolactin, somatotropin, or saline, during early stages of larval development. Brain and body growth and aspects of brain nucleic acid metabolism were studied at frequent intervals through metamorphosis. The three groups showed no differences in morphology, rates of development, or general patterns of body growth—although the extent of body growth was increased in the experimental groups. In contrast, both hormones produced profound and very different effects on neurogenesis. Increases in brain weight and DNA and RNA content after prolactin treatment were modest during the early stages, but ultimately extensive; and this enhancement embraced all three major regions: forebrain, midbrain, and hindbrain. Labeling experiments with tritiated thymidine showed that prolactin caused both an increase in brain DNA synthesis (during the early and especially the mid-larval stages) and a decrease in neural cell death (during late stages). Somatotropin greatly enhanced brain weight and DNA content (in all three brain regions) during the period of its administration. Labeling experiments attributed this to a period of very rapid DNA synthesis. By the end of metamorphosis, however, the somatotropin-treated animals showed only slight advantages over the controls in brain weight and nucleic acid content—although the forebrain remained significantly enhanced. Possible mechanisms of hormone action and roles for these hormones in normal neurogenesis are discussed, as are some of the technical problems in experiments of this sort. Finally, comments are made on normal neurogenesis based on observations of the control population." @default.
- W2000635748 created "2016-06-24" @default.
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- W2000635748 date "1971-09-01" @default.
- W2000635748 modified "2023-09-27" @default.
- W2000635748 title "Neurogenesis in frogs after early larval treatment with somatotropin or prolactin" @default.
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- W2000635748 doi "https://doi.org/10.1016/0012-1606(71)90111-4" @default.
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