1-MT	1-methyltryptophan
3-HAAO	3-hydoxyanthranillic acid dioxygenase
3-HK	3-Hydroxykynurenine
α7nAChR	Alpha-7-nicotinic acetylcholine receptor
AβPP/PS	double transgenic mice expressing a chimeric mouse/human amyloid precursor protein (Mo/HuAPP695swe) and a mutant human presenilin 1 (PS1-dE9)
ACMSD	2-Amino-3-carboxymuconic-6-semiladehyde decarboxylase
AD	Alzheimer’s disease
AhR	Aryl hydrocarbon receptor
BBB	blood–brain barrier
CA	Cinnabarinic acid
CA1	Cornu Ammonis 1
CNS	Central nervous system
COX2	Cyclooxygenase 2
CSF	Cerebrospinal fluid
FCMTE	Familial cortical myoclonic tremor with epilepsy
GlyB	Glycine B Site
GPR35	G-protein couples receptor 35
GWAS	Genome Wide Association Studies
HD	Huntington’s disease
HIV	Human immunodeficiency virus
ICV	Intracerebroventricular
IDO	Indoleamine-2,3-dioxygenase
KAT	Kynurenine aminotransferase
KA	Kynurenic acid
KAT	Kynurenine aminotransferase
Kyn	Kynurenine
KMO	Kynurenine-3-monooxygenase
KP	kynurenine Pathway
LAT1	Large amino acid transporter 1
LPS	Lipopolysaccharide
LTP	Long term potentiation
MDD	Major depressive disorder
mGLUR	Metabotropic glutamate receptors
MPTP	1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
NAD	Nicotinamide adenine dinucleotide
NMDAR	N-methyl-D-aspartate receptor
PD	Parkinson’s disease
PA	Picolinic acid
PDD	Postpartum depression
QA	Quinolinic acid
SBI	Surgical brain injury
SNI	Spared nerve injury
SNP	Single nucleotide polymorphism
SNRI	Selective norepinephrine reuptake inhibitor
SSRI	Selective serotonin reuptake inhibitor
TCA	Tricyclic antidepressants
TDO	Tryptophan-2,3-dioxygnease
TRD	Treatment resistant depression
TRP	Tryptophan
VGLUT	Vesicle glutamate transporter