Abstract
The activities of threonine dehydratase (l-threonine hydro-lyase EC4.2.1. 16) and tryptophan pyrrolase (l-tryptophan: Oxygen oxido-reductase EC 1.13.1.12) were measured in tissues from rats subjected to hormonal and dietary treatments. Both treatment with cortisol and a high protein intake resulted in elevations in the activities of these enzymes in intact, hypophysectomized, and thyroidectomized rats. The combined effect of cortisol treatment and a high protein intake on the activities of threonine dehydratase and tryptophan pyrrolase was as great or greater than the sum of the two treatments individually. Thyroidectomy resulted in a two- to threefold increase in the activity of threonine dehydratase, but did not affect the activity of tryptophan pyrrolase. Thyroxine injections depressed threonine dehydratase activity in intact, hypophysectomized, and thyroidectomized rats. Thyroxine also depressed the activity of threonine dehydratase in rats fed a high protein diet or injected with cortisol. Tryptophan pyrrolase activity was not altered in intact rats treated with thyroxine but was depressed in hypophysectomized rats fed control or high protein diets.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 556-563 |
| Number of pages | 8 |
| Journal | Proceedings of the Society for Experimental Biology and Medicine |
| Volume | 130 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 1 1969 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
Cite this
Effects of Thyroxine and Cortisol on Liver Threonine Dehydratase and Tryptophan Pyrrolase in Rats Fed a High Protein Diet. / Ku, Y.; Rogers, Quinton; Harper, A. E.
In: Proceedings of the Society for Experimental Biology and Medicine, Vol. 130, No. 2, 01.01.1969, p. 556-563.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of Thyroxine and Cortisol on Liver Threonine Dehydratase and Tryptophan Pyrrolase in Rats Fed a High Protein Diet
AU - Ku, Y.
AU - Rogers, Quinton
AU - Harper, A. E.
PY - 1969/1/1
Y1 - 1969/1/1
N2 - The activities of threonine dehydratase (l-threonine hydro-lyase EC4.2.1. 16) and tryptophan pyrrolase (l-tryptophan: Oxygen oxido-reductase EC 1.13.1.12) were measured in tissues from rats subjected to hormonal and dietary treatments. Both treatment with cortisol and a high protein intake resulted in elevations in the activities of these enzymes in intact, hypophysectomized, and thyroidectomized rats. The combined effect of cortisol treatment and a high protein intake on the activities of threonine dehydratase and tryptophan pyrrolase was as great or greater than the sum of the two treatments individually. Thyroidectomy resulted in a two- to threefold increase in the activity of threonine dehydratase, but did not affect the activity of tryptophan pyrrolase. Thyroxine injections depressed threonine dehydratase activity in intact, hypophysectomized, and thyroidectomized rats. Thyroxine also depressed the activity of threonine dehydratase in rats fed a high protein diet or injected with cortisol. Tryptophan pyrrolase activity was not altered in intact rats treated with thyroxine but was depressed in hypophysectomized rats fed control or high protein diets.
AB - The activities of threonine dehydratase (l-threonine hydro-lyase EC4.2.1. 16) and tryptophan pyrrolase (l-tryptophan: Oxygen oxido-reductase EC 1.13.1.12) were measured in tissues from rats subjected to hormonal and dietary treatments. Both treatment with cortisol and a high protein intake resulted in elevations in the activities of these enzymes in intact, hypophysectomized, and thyroidectomized rats. The combined effect of cortisol treatment and a high protein intake on the activities of threonine dehydratase and tryptophan pyrrolase was as great or greater than the sum of the two treatments individually. Thyroidectomy resulted in a two- to threefold increase in the activity of threonine dehydratase, but did not affect the activity of tryptophan pyrrolase. Thyroxine injections depressed threonine dehydratase activity in intact, hypophysectomized, and thyroidectomized rats. Thyroxine also depressed the activity of threonine dehydratase in rats fed a high protein diet or injected with cortisol. Tryptophan pyrrolase activity was not altered in intact rats treated with thyroxine but was depressed in hypophysectomized rats fed control or high protein diets.
UR - http://www.scopus.com/inward/record.url?scp=0014466423&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0014466423&partnerID=8YFLogxK
U2 - 10.3181/00379727-130-33605
DO - 10.3181/00379727-130-33605
M3 - Article
C2 - 5765299
AN - SCOPUS:0014466423
VL - 130
SP - 556
EP - 563
JO - Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N. Y.)
JF - Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N. Y.)
SN - 1535-3702
IS - 2
ER -