Kar A, Chandola-Saklani A
Gen Comp Endocrinol. 1985 Oct;60(1):14-9. doi: 10.1016/0016-6480(85)90286-2.
Circulating thyroxine (T4) and triiodothyronine (T3) were estimated by RIA in plasma samples of Calotes versicolor collected over a period of 28 months. Monthly observations on seasonal events, viz., molting, whole body O2 consumption, abdominal fat deposition, and testes weight were also made. Plasma T4 ranged from 0.16 to 4.63 ng/ml and T3 from 0 to 1.76 ng/ml during the course of the year. Peaks of T4 and T3 could be related with prehibernating (October/November) and posthibernating (March/April) periods, when scale shedding and O2 consumption were also enhanced. Maximum abdominal fat deposition was found in prehibernatory months (October/November). Thyroid hormone levels declined sharply with entry into hibernation. Abdominal fat deposits gradually decreased, being almost depleted by the end of hibernation. The gradual increase in thyroid hormone concentration in the later half of hibernation may be associated with increased lipolysis and preparation of the oncoming reproductive period. Although T4 and T3 profiles were apparently parallel, discrepancies were observed. Posthibernatory peak of T4 was maintained much longer than that of T3 which declined earlier. Also the rise in the prehibernatory T3 concentration was delayed as compared to that in T4.
在28个月的时间里，对变色树蜥的血浆样本进行放射免疫分析（RIA），以估算循环甲状腺素（T4）和三碘甲状腺原氨酸（T3）的水平。同时还每月观察季节性事件，即蜕皮、全身耗氧量、腹部脂肪沉积和睾丸重量。一年中，血浆T4的范围为0.16至4.63纳克/毫升，T3的范围为0至1.76纳克/毫升。T4和T3的峰值可能与冬眠前（10月/11月）和冬眠后（3月/4月）时期有关，此时蜕皮和耗氧量也会增加。最大腹部脂肪沉积出现在冬眠前的月份（10月/11月）。进入冬眠时，甲状腺激素水平急剧下降。腹部脂肪沉积逐渐减少，到冬眠结束时几乎耗尽。冬眠后期甲状腺激素浓度的逐渐增加可能与脂肪分解增加和即将到来的繁殖期的准备有关。尽管T4和T3的变化趋势明显平行，但仍观察到差异。冬眠后T4的峰值维持的时间比T3长得多，T3下降得更早。此外，与T4相比，冬眠前T3浓度的上升也有所延迟。
