The daily neuroimmunoendocrine rhythms (gonadal, adrenal, pituitary hormones) are controlled by a central pacemaker, which is found in a hypothalamic region called the suprachiasmatic nucleus (SCN) of the central nervous system (CNS). The daily neuroimmunoendocrine rhythms (gonadal, adrenal, pituitary hormones) are controlled by a central pacemaker, which is found in a hypothalamic region called the suprachiasmatic nucleus (SCN) of the central nervous system (CNS). APC, antigen presenting cell; DHEA, dehydroepiandrosterone; Th, T helper cell; Treg, regulatory T cell. Maurizio Cutolo RMD Open 2016;2:e000203 Copyright © BMJ Publishing Group & EULAR. All rights reserved.