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Blood glucose regulation in larval and adult salamanders (Ambystoma tigrinum)

✍ Scribed by Bartell, Marvin Henry ;Frye, B. E.

Publisher: John Wiley and Sons
Year: 1974
Tongue: English
Weight: 673 KB
Volume: 190
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1401900207

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✦ Synopsis

Abstract

Blood glucose in Ambystoma tigrinum is regulated at a lower level in larval (18.4 ± 0.7 mg%) than in adult (27.8 ± 0.8 mg%) animals. The difference is observed at all seasons, and is not related to differences in size, diet or sexual maturity. A difference in the blood glucose regulating mechanism in pre‐ and post‐metamorphic animals is further shown by three other observations: (1) larvae are more insulin sensitive than adults; (2) larvae have a slightly greater glucose tolerance than adults; and (3) pancreatectomy causes a more severe hyperglycemia in adults than in larvae.

The best hypothesis to account for all of these observations is that an increase in the amount and/or activity of insulin antagonistic hormones occurs at metamorphosis.

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