5-HT(2A)	serotonin 2A (receptor)
ACC	anterior cingulate cortex
ACTH	adrenocorticotropin
alpha-MSH	alpha-melanocyte-stimulating hormone
BBB	blood-brain barrier
CaV	voltage-gated Ca2+ channels
CCI	chronic constriction injury
CCK	cholecystokinin
CGRP	calcitonin gene-related peptide
CNS	central nervous system
DOP	δ-opioid peptide (receptor)
DRG	dorsal root ganglia
GPCR	GTP-binding protein (G protein)-coupled receptor
KOP	κ-opioid peptide (receptor)
MC4	melanocortin type 4 (receptor)
mGlu1	metabotropic glutamate 1 (receptor)
MOP	μ-opioid peptide (receptor)
MPEP	2-Methyl-6-(phenylethynyl)pyridine hydrochloride
MSH	melanocyte stimulating hormone
N/OFQ	nociceptin/orphanin FQ
NK1	neurokinin-1 (receptor)
NMDA	N-methyl-D-aspartate
NO	nitric oxide
NOP	nociceptin/orphanin FQ peptide (receptor)
NP	neuropathic pain
NTS1/2	neurotensin subtype 1/2 (receptor)
OP	opioid pharmacophore
PAG	periaqueductal grey matter
PARS	poly(ADP-ribose) synthetase
PKC	protein kinase C
PNS	peripheral nervous system
POMC	proopiomelanocortin
RVM	rostral ventromedial medulla
SNL	sciatic nerve ligation