文献类型： 外文期刊

作者： Xie, Zhigang ¹ ; Ahmad, Ibrahim M. ³ ; Zuo, Lirong ³ ; Xiao, Feng ² ; Wang, Yongpeng ² ; LI, Dongming ¹ ;

作者机构： 1.Zhejiang Acad Agr Sci, Hangzhou, Peoples R China

2.Zhejiang Normal Univ, Coll Chem & Life Sci, Jinhua, Zhejiang, Peoples R China

3.Hebei Normal Univ, Mini Educ, Coll Life Sci,Key Lab Mol & Cellular Biol, Key Lab Anim Physiol Biochem & Mol Biol Hebei Pro, Shijiazhuang, Hebei, Peoples R China

关键词： Asiatic toad; circadian rhythm; clock genes; cold exposure; hibernation; metabolic hormones

期刊名称：INTEGRATIVE ZOOLOGY （ 影响因子：2.083； 五年影响因子：2.271 ）

ISSN： 1749-4877

年卷期： 2022 年 17 卷 4 期

页码：

收录情况： SCI

摘要： Hibernation is one of the fundamental strategies in response to cold environmental temperatures. During hibernation, the endocrine and circadian systems ensure minimal expenditure of energy for survival. The circadian rhythms of key hormones, melatonin (MT), corticosterone (CORT), triiodothyronine (T-3), and thyroxine (T-4), and the underlying molecular regulatory mechanisms of hibernation have been well determined in mammals but not in ectotherms. Here, a terrestrial hibernating species, Asiatic toad (Bufo gargarizans), was employed to investigate the plasma CORT, MT, T-3, and T-4; and the retina, brain, and liver mRNA expression of the core clock genes, including circadian locomotor output cycles kaput (Clock), brain and muscle ARNT-like 1 (Bmal1), cryptochrome (Cry) 1 and 2, and period (Per) 1 and 2, at 7-time points over a 24-h period under acute cold (1 day at 4 degrees C), and hibernation (45 days at 4 degrees C). Our results showed that the circadian rhythms of the core clock genes were rather unaffected by acute cold exposure in the retina, unlike the brain and liver. In contrast, during hibernation, the liver clock genes displayed significant circadian oscillations, while those in the retina and brain stopped ticking. Furthermore, plasma CORT expressed circadian oscillations in both groups, and T-3 in acute cold exposure group, whereas T-4 and MT did not. Our results reveal that the plasma CORT and the liver sustain rhythmicity when the brain was not, indicating that the liver clock along with the adrenal clock synergistically maintains the metabolic requirements to ensure basic survival in hibernating Asiatic toads.