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Hormonal dependence of tail regeneration in the lizardAnolis carolinensis

✍ Scribed by Licht, Paul ;Howe, Nathan R.

Publisher: John Wiley and Sons
Year: 1969
Tongue: English
Weight: 626 KB
Volume: 171
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1401710111

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✦ Synopsis

Removal of the pars distalis several days before the amputation of the tail in Anolis carolinensis delays blastema formation and virtually abolishes tail regeneration. Hypophysectomy on, or several days after, tail amputation does not delay blastema formation but tail growth is largely abolished. If lizards are hypophysectomized after the blastema has formed and the tail has begun to elongate, the rate of tail regeneration is greatly reduced within a few days.

Injection of a combination of adenohypophysial hormones (growth hormone, prolactin, gonadotropin, and thyrotmpin) restored tail regeneration to near normal levels in hypophysectomized lizards.

A quantitative relationship was evident between the amount of pars distalis removed and the rate of tail regeneration. However, there was no apparent relationship between the region of the gland removed and regeneration, indicating that tail regeneration is probably dependent on a combination of several pituitary hormones.

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