The Size of the Corpus Luteum during Pseudopregnancy and Pregnancy in the Rat

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概要

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• The corpus luteum in mature Sprague Dawley rats was weighed at the various stages of pseudopregnancy and pregancy. The average size of these corpora lutea was 1.0±0.10mg, 1.61 ±0.69mg, 1.90±0.25mg, 3.69±0.36mg, and 4.37±0.50mg on day 2 of diestrus, on days 10-15 of pseudopregnancy, on days 9-10, 14, and 20 of pregnancy, respectively. The fact that the average size of the corpus luteum on days 10-15 of pseudopregnancy was larger than that on day 2 of diestrus is thought to drive from prolonged exposure of the corpus luteum to prolactin. The average size of the corpus luteum on days 9-10 of pregnancy had a tendency to be larger than that on days 10-15 of pseudopregnancy and this seems to demonstrate that the placenta secreted placental lactogen by this stage of pregnancy. The average size of the corpus luteum on day 14 of pregnancy was larger than that on days 9-10 of pregnancy. This phenomenon might be attributed to the presence of large amounts of placental lactogen secreted from the placenta between days 10 and 14 of pregnancy. Furthermore, it was noted that the size of the corpus luteum on day 20 of pregnancy was larger than that of day 14, which suggests that further secretion of placental lactogen continued after day 14 of pregnancy. As there was a remarkable decrease in the number of fetuses on day 20 of pregnancy when ovariectomy was performed on day 14 of pregnancy, the ovary was considered indispensable in maintaining pregnancy in the rat.

• 社団法人 日本内分泌学会の論文

著者

• Noguchi Kunio

  Department Of Physics Nagoya University

• Saito Motoi

  Department Of Obstetrics Aud Gynecology School Of Medicine Tokyo Medical And Dental University Tokyo

• Okamoto Ryohei

  Department Of Endocrinology Medical Research Institute Tokyo Medical And Dental University

• OKAMOTO RYOHEI

  Department of Obstetrics and Gynecology, Tokyo Medical and Dental University

• Miyagawa Noboru

  Department of Obstetrics and Gynecology, Tokyo Medical and Dental University

• SAITO MOTOI

  Department of Obstetrics and Gynecology, Tokyo Medical and Dental University

• NOGUCHI KUNIO

  Department of Obstetrics and Gynecology, Tokyo Medical and Dental University

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