GPCR	G protein coupled receptors
AR	adenosine receptor
AC	adenylate cyclase
cAMP	cyclic adenosine monophosphate
ATP	adenosine triphosphate
ADA	adenosine deaminase
PKA	protein kinase A
PLC	protein lipase C
IP3	inositol triphosphate
DAG	diacylglycerol
ERK	extracellular signal-regulated kinase
NO	nitric oxide
cGMP	cyclic guanosine monophosphate
PKG	protein kinase G
PAG	periaqueductal gray
CCI	chronic constriction injury
CFA	complete Freund’s adjuvant
SCNL	sciatic nerve ligation
KO	knockout
PAP	prostatic acid phosphatase
SCI	spinal cord injury
SNL	spinal nerve ligation
STZ	streptozotocin
ROS	reactive oxygen species
NF-κB	nuclear factor kappa-light-chain-enhancer of activated B cells
TNF-α	tumor necrosis factor-α
iNOS	inducible nitric oxide synthase
SIN	sciatic inflammatory neuropathy
PKC	protein kinase C
IL	interleukin
PI3K	phosphoinositide 3-kinase
MAPK	mitogen-activated protein kinase
CREB	cAMP response element-binding protein