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Biol Bull 121: 547-553. (December 1961)
© 1961 Marine Biological Laboratory
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TRYPTOPHAN PYRROLASE ACTIVITY IN THE LIVER OF ADULT RANA PIPIENS

MELVIN SPIEGEL 1

1 Department of Zoology, Dartmouth College, Hanover, New Hampshire

1. The effect of the injection of L-tryptophan, L-histidine, ACTH, cortisone acetate, hydrocortisone acetate, and pituitary on liver tryptophan pyrrolase activity was studied in adult male and female Rana pipiens.

2. L-tryptophan produced a 427% increase in activity but cortisone acetate and hydrocortisone acetate injections had no effect. ACTH and L-histidine injections produced a slight decrease in activity. Pituitary injections brought about a marked decrease in activity.

3. In adult females there was a progressive increase in enzyme activity following hibernation and during the breeding season. This progressive increase was followed by a sharp drop in activity following ovulation.

4. The results are discussed in terms of the mammalian data.






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Copyright © 1961 by the Marine Biological Laboratory.