ACTH	adrenocorticotropic hormone
ACPA	anti-citrullinated protein antibody
AP-1	activator protein 1
BMDM	bone marrow-derived monocyte/macrophage
CAPRA	Circadian Administration of Prednisone in RA
CIA	collagen-induced arthritis
Ctsk	cathepsin K
CCL2	C-C- motif ligand 2
CRP	C-reactive protein
CXCL1	C-X-C motif ligand 1
DMARD	disease-modifying anti-rheumatic drug
GM-CSF	granulocyte macrophage-colony stimulating factor
HALO	hours after the light was turned on
IFN	interferon
IFR3	interferon regulatory factor 3
IL-1	interleukin-1
FLS	fibroblast-like synoviocyte
H3K27ac	acetylation of lysine 27 in histone H3
H3K27me3	trimethylation of lysine 27 in histone H3
HMGB1	high mobility group box 1
JAK	Janus kinase
KO	knockout
LPS	lipopolysaccharide
MAPK	mitogen-activated protein kinase
M-CSF	macrophage-colony stimulating factor
MLS	macrophage-like synoviocyte
MMP	matrix metalloproteinase
MTX	methotrexate
Nfatc1	nuclear factor of activated T cells 1
NF-kB	nuclear factor kappa B subunit 1
NK cell	natural killer cell
NKT cell	natural killer T cell
Opg	osteoprotegerin
PAS	Per-Armt-Sim domain
PKA	protein kinase A
PRR	pattern recognition receptor
RA	rheumatoid arthritis
RANKL	receptor activator of nuclear factor-κB ligand
Rev-erbα	reverse orientation c-erbAα
RORα	retinoic acid receptor-related orphan receptor α
RRE	Rev-erb/ROR response element
SAA	serum amyloid A
TGFβ	transforming growth factor β
TLR2	toll-like receptor 2
WT	wild type
ZT	Zeitgeber Time