Adenohypophysial-thyroid activity of the tiger salamander, Ambystoma tigrinum, as a function of metamorphosis and captivity

The Journal of Experimental Zoology
M F NormanD O Norris

Abstract

The aim of this study was to determine the timing of adenohypophysial activation during metamorphosis of the tiger salamander, Ambystoma tigrinum. It consisted of two parts: 1) determination of plasma thyroid hormone concentrations and analysis of thyroid gland histology as a function of metamorphic stage and 2) analysis of the time-course of uptake of 125I by the thyroids during metamorphosis as an indicator of endogenous thyrotropin (TSH) levels. Significant increases in both triiodothyronine (T3) and thyroxine (T4) first were evident at the onset of metamorphic climax (stage II). Maximum levels of both hormones were not observed, however, until the completion of gill resorption (stage VII). No changes in thyroid histology were observed that could be unambiguously related to metamorphic transformation. The thyroids accumulated 125I in a slow but linear fashion in premetamorphic larvae (stage I). However, uptake exhibited a rapid peak during early climax (stage II), before maximum concentrations of thyroid hormones were observed. In addition, uptake was maintained above premetamorphic levels at stage VII, in conjunction with maximum levels of T4 and T3. Captivity alone produced a small but significant increase in plasma concen...Continue Reading

References

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Citations

Oct 1, 1992·Comparative Biochemistry and Physiology. Comparative Physiology·D O NorrisM F Norman
Apr 5, 2011·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·P HugginsS R Voss
Jul 1, 1988·General and Comparative Endocrinology·James A Carr, D O Norris
Jun 1, 1997·General and Comparative Endocrinology·D O NorrisR Featherston
Jun 30, 2006·Toxicological Sciences : an Official Journal of the Society of Toxicology·Fang HuJames A Carr

Related Concepts

Ambystoma tigrinum
Tadpole
Biological Metamorphosis
Pituitary Gland, Anterior
Thyroid Gland
Novothyral
Cytomel

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