Physiological studies on supercooled killifish (Fundulus heteroclitus). IV. Carbohydrate metabolism in hypophysectomized killifish at subzero temperatures
✍ Scribed by Umminger, Bruce L.
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 462 KB
- Volume
- 181
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
Abstract
Intact Fundulus heteroclitus, acclimated to −1.5°C in sea water, showed increased levels of serum glucose, decreased levels of hepatic glycogen and unchanged levels of serum non‐glucose free carbohydrates and muscle glycogen when compared with controls at 20°C. In hypophysectomized killifish, acclimation to subzero temperatures was accompanied by hyperglycemia, increased concentrations of muscle glycogen and increased levels of serum non‐glucose free carbohydrates. Hepatic glycogen concentration as mg/g of liver was unchanged in cold‐acclimated hypophysectomized fish, but liver size increased so that total hepatic glycogen (mg/g of fish) was markedly elevated. The pituitary gland was not involved in eliciting the cold‐induced hyperglycemia but was important in regulating other aspects of carbohydrate metabolism.