2-AG	2-arachidonoylglycerol
3-HA	3-hydroxyanthranilic acid
3-HK	3-hydroxy-l-kynurenine
AEA	anandamide
AMPA	α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid
ANA	anthranilic acid
cAMP	cyclic adenosine monophosphate
CB1	type 1 cannabinoid receptor
CB2	type 2 cannabinoid receptor
CFA	complete Freund’s Adjuvant
CGRP	calcitonin gene-related peptide
CSD	cortical spreading depression
DRG	dorsal root ganglion
FAAH	fatty acid amide hydrolase
GABA	γ-Aminobutyric acid
GPCR	G-protein coupled receptor
GPR35	G protein coupled receptor 35
HINT1	histidine triad nucleotide-binding protein 1
IDO	indoleamine 2,3-dioxygenase
KA1	N-(2-N,N-dimethylaminoethyl)-4-oxo-1H-quinoline-2-carboxamide hydrochloride
KA2	N-(2-N-pyrrolidinylethyl)-4-oxo-1H-quinoline-2-carboxamide hydrochloride
KATII	kynurenine aminotransferase II
KMO	kynurenine 3-monooxygenase
KP	kynurenine pathway
KYNA	kynurenic acid
KYNU	l-kynurenine hydrolase
L-KYN	l-kynurenine
MAGL	monoacylglycerol lipase
MAP	mitogen-activated protein kinases
MOR	μ opioid receptor
NAD+	nicotinamide adenine dinucleotid
NMDA	N-methyl-d-aspartate
NO	nitric oxide
NTG	nitroglycerin
NAc	nucleus accumbens
PAG	periaqueaductal grey
QUIN	quinolinic acid
TDO	tryptophan 2,3-dioxygenase
THC	Δ9-tetrahydrocannabinol
Trp	tryptophan
α7nAChR	α7 nicotinic acetylcholine receptor
σ1R	σ receptor type 1