TY - JOUR
T1 - Interaction between thermal environments and hormones affecting skin-shedding frequency in the tokay (Gekko gecko) (Gekkonidae, lacertilia)
AU - Chiu, K. W.
AU - Sham, J. S.K.
AU - Maderson, P. F.A.
AU - Zucker, A. H.
N1 - Funding Information:
A~kno~~lr~lgenlenrs-Twhoisrk was supportedb y grants from NIH (CA 18622. NS 13924) and from CUNY PSC-BHE Awards (10.5791, 1404,1 1629,1 2257.1 3053a nd 14056).
PY - 1986
Y1 - 1986
N2 - 1. 1. Effects of thyroidectomy and/or hypophysectomy on the skin-shedding frequency (SF) in the tokay Gekko gecko and of thyroid hormones on the oxygen consumption (OCR) at various temperature regimes have been determined. 2. 2. Surgery invariably protracted the cycle length, thus decreasing SF; the extent of these changes was temperature dependent, the higher the temperature, the less the difference. 3. 3. Effects of hypophysectomy on cycle length were expressed in two phases; an extended first post-operative cycle was followed by a further extended second post-operative cycle, with cycle length forming a plateau thereafter. With time, the operated tokays would die without shedding during a greatly protracted cycle. 4. 4. OCRs in the tokay were temperature dependent, but between 28 and 34°C, no significant difference could be seen. 5. 5. Effects of thyroid hormones on OCR were also temperature dependent. Furthermore, tokays having higher OCR were shown to have shorter cycles and vice versa. 6. 6. Results showed that whatever effect hormone(s) have on SF is indirect through general metabolic changes. SF is merely a reflection of the general metabolic status of the animal. 7. 7. It is proposed that the role of hormone(s), those of the thyroid in particular, is to act as "fine-tuning" devices in the regulation of metabolism and, as such, of the viability of the animal.
AB - 1. 1. Effects of thyroidectomy and/or hypophysectomy on the skin-shedding frequency (SF) in the tokay Gekko gecko and of thyroid hormones on the oxygen consumption (OCR) at various temperature regimes have been determined. 2. 2. Surgery invariably protracted the cycle length, thus decreasing SF; the extent of these changes was temperature dependent, the higher the temperature, the less the difference. 3. 3. Effects of hypophysectomy on cycle length were expressed in two phases; an extended first post-operative cycle was followed by a further extended second post-operative cycle, with cycle length forming a plateau thereafter. With time, the operated tokays would die without shedding during a greatly protracted cycle. 4. 4. OCRs in the tokay were temperature dependent, but between 28 and 34°C, no significant difference could be seen. 5. 5. Effects of thyroid hormones on OCR were also temperature dependent. Furthermore, tokays having higher OCR were shown to have shorter cycles and vice versa. 6. 6. Results showed that whatever effect hormone(s) have on SF is indirect through general metabolic changes. SF is merely a reflection of the general metabolic status of the animal. 7. 7. It is proposed that the role of hormone(s), those of the thyroid in particular, is to act as "fine-tuning" devices in the regulation of metabolism and, as such, of the viability of the animal.
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U2 - 10.1016/0300-9629(86)90627-4
DO - 10.1016/0300-9629(86)90627-4
M3 - Article
C2 - 2873933
AN - SCOPUS:0022511293
SN - 0300-9629
VL - 84
SP - 345
EP - 351
JO - Comparative Biochemistry and Physiology -- Part A: Physiology
JF - Comparative Biochemistry and Physiology -- Part A: Physiology
IS - 2
ER -