Zoological Research ›› 2019, Vol. 40 ›› Issue (6): 583-586.doi: 10.24272/j.issn.2095-8137.2019.064

Special Issue: Animal models Neuroscience

• Letters to the editor • Previous Articles     Next Articles

Direct sunlight exposure reduces hair cortisol levels in rhesus monkeys (Macaca mulatta)

Xiao-Li Feng1,2,He-Long Che3, Xi Ning1,Xue-Ying Ba1, Juan-Li1,Jing-Fang Zhang1,Yun Wang4,Zheng-Fei Hu4,Xin-Tian Hu2(),Xiao-Feng Ren2,5()   

  1. 1. School of Basic Medical Sciences, Kunming Medical University, Kunming Yunnan 650500, China
    2. Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences & Yunnan Province,Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming Yunnan 650223, China
    3. Department of General Surgery, 908th Hospital of Chinese PLA Joint Logistic Support Force, Yingtan Jiangxi 335000, China
    4. Kunming Primate Research Center of the Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming Yunnan 650223, China
    5. Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming Yunnan 650204, China
  • Received:2019-05-09 Accepted:2019-10-09 Online:2019-11-18 Published:2019-10-14
  • Contact: Xin-Tian Hu,Xiao-Feng Ren E-mail:renxiaofeng17@mails.ucas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China (31700910) and Applied Basic Research Programs of Science and Technology Commission Foundation of Yunnan Province(2017FB109)


Major depressive disorder (MDD), commonly known as depression, is a mental disease characterized by a core symptom of low mood. It lasts at least two weeks (Badamasi et al., 2019; Wang et al., 2019) and is frequently accompanied by low self-esteem, loss of interest in routinely enjoyable activities, low energy, and unexplained pain (Huey et al., 2018; Park et al., 2012; Post & Warden, 2018; Rice et al., 2019; Xiao et al., 2018). Approximately 2%–8% of adults with MDD commit suicide (Richards & O'Hara, 2014; Strakowski & Nelson, 2015), and around half of suicidal individuals suffer depression or other mood disorders (Bachmann, 2018).

Key words: Sunlight exposure, Rhesus monkeys, HPA axis, Hair cortisol, Seasonal affective disorder (SAD)