RA	Rheumatoid arthritis
AS	Ankylosing spondylitis
PsA	Psoriatic arthritis
ARs	Adenosine receptors
NF-κB	Nuclear factor κ-B
TNF-α	Tumor necrosis factor α
IL	Interleukin
MMP	Metalloproteinases
cAMP	Cyclic adenosine monophosphate
DMARDS	Disease-modifying antirheumatic drug
NSAIDs	Nonsteroidal anti-inflammatory drugs
NURR1	Nuclear orphan receptor
PDE-4	Phosphodiesterase-4
ACR	American College of Rheumatology
RF	Rheumatoid factor
ACPA	Anti-citrullinated cyclic peptide
DAS28	Disease Activity Score evaluated in 28 joints
HAQ	Health Assessment Questionnaire
ASAS	Assessment of SpondyloArthritis international Society
CASPAR	Classification of Psoriatic Arthritis
BASDAI	Bath Ankylosing Spondylitis Disease Activity Index
BASFI	Bath Ankylosing Spondylitis Functional Index
RT-PCR	Real-time polymerase chain reaction
PMA	Phorbol myristate acetate