Effects of insulin on the glucose uptake by the thyroid gland of the turtleChrysemys dorbigni acclimated to different temperatures
✍ Scribed by Machado, Vera L. A. ;Marques, Maria
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 562 KB
- Volume
- 266
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
Abstract
Insulin stimulation of the glucose uptake by the thyroid gland of the turtle (Chrysemys dorbigni) has been previously reported. The aim of the present study was to examine the influence of different temperatures (6, 25, or 36°C) on this effect. Insulin‐stimulated glucose uptake was evident when turtles were acclimated for 15 days at 25° or 36°C, and their glands studied at the respective temperatures. In glands from turtles acclimated at 6°C, this effect was only seen when the preincubation and incubation time was extended from 60 to 300 min. The findings show that in this ectotherm species (1) the insulin effect is temperature dependent, and (2) can be expressed at very low temperature. © 1993 Wiley‐Liss, Inc.