抄録
From this series of experiments, it may be concluded:
1. Both hydrolytic and esterifying cholesterol esterase systems are established in the testes and the ovary of the rat, though their activity is remarkably weak as compared with adrenal cholesterol esterase. The differences of the enzyme activity are not almost recognized between the testes and the ovary.
2. Esterifying activity of these two enzymes are stronger than their hydrolytic activity.
3. The optimum pH of the enzymes are 6.8 (6.6_??_6.9) in the testes and 6.6 (6.5_??_6.8) in the ovary.
4. These two enzymes are activated by bile salts.
The author wishes to express his thanks to Prof. Raijiro Takahashi for his interest and encouragement. Thanks are ablso due to Mr. Mitsuyoshi Ueno, Mr. Atsushi Irizawa and Mr. Shigeki Umezane for their able collaborations in the course of these experiments. And this work has been partly supported by a grant in aid for the Miscellaneous Scientific Research from the Ministry of Education in 1953.
