In Vivo Effect of Sex Steroids on Uptake of ^3H-leucine by Female Mouse Brain

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概要

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• In vivo effects of the sex steroids estrogen and progesterone on ^3H-leucine uptake by the brain of mature ovariectomized mice were examined. Animals were divided into three groups: group 1, consisting of control animals treated with sesame oil, group 2, animals treated with estrogen, and group 3, animals first treated with estrogen and then with progesterone. Each group was given a single i.p. injection of ^3H-leucine 2 hr after the last hormonal treatment, and sacrificed 2 hr later. Intensity of the uptake of radiolabeled leucine was measured by counting the number of reduced silver grains over cells in various brain regions using an autoradiographic technique. Group 1 showed a relatively high uptake in the SO, PV and VM when compared with that in the remaining hypothalamic nuclei examined. Group 2 showed a significant enhancement of the uptake in all hypothalamic regions except the PPV when compared with that in group 1. Group 3 showed enhancement of the uptake in all hypothalamic nuclei when compared with that in group 1. However, only the PV, PPV, VM and ARC revealed a significantly higher uptake than the respective nuclei in group 2. The remaining nuclei showed no change in uptake. Uptake by cells in the EC and CC remained unchanged after hormonal treatment. The present results suggest that in female mice estrogen and estrogen plus progesterone stimulate protein synthesis in most of the hypothalamic nuclei and that the progesterone effect on protein synthesis is greatly influenced by estrogen-priming.

著者

• Haruki Yasuo

  Department Of Anatomy School Of Medicine Tokai University

• Seiki Kanji

  Department Of Anatomy School Of Medicine Tokai University

• Seiki Kanji

  Department Of Analomy School Of Medicine Tokai University

• IMANISHI Yoshio

  Department of Anatomy, School of Medicine, Tokai University

• Imanishi Yoshio

  Department Of Anatomy School Of Medicine Tokai University

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