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Influence of vasopressin and oxytocin on neoteny in the adult mexican axolotlAmbystoma mexicanum

✍ Scribed by Wells, Dan E. ;Moser, Charles R.

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
496 KB
Volume
221
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Lysine‐vasopressin and oxytocin were tested on the normally neotenous adult Mexican axolotl, Ambystoma mexicanum, to determine their influence on metamorphosis. The salamanders were divided into four groups, and daily injections of saline, lysine‐vasopressin, oxytocin, and TSH were made over a 28‐day test period. Tail height, gill length, and body weight were measured as indicators of metamorphic change. Additionally, thyroid uptake of ^131^I was determined.

The results showed that the vasopressin and oxytocin groups had a significant (P < 0.01) loss in tail height and body weight compared to controls, but showed no gill rachis resorption or ^131^I uptake. These results suggest that the effects of vasopressin and oxytocin were not mediated by TSH and thyroxine, but rather may be caused by an antagonism of prolactin.

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