α	alpha
α7nAchR	α-7 Nicotinic acetylcholine receptor
α-syn	alpha-Synuclein
AD	Alzheimer’s disease
AHRs	Aryl hydrocarbon receptors
ALS	Amyotrophic lateral sclerosis
AMPA	α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid
ATP	Adenosine triphosphate
BBB	Blood-brain barrier
CA	Cinnabarinic acid
CNS	Central nervous system
CSF	Cerebrospinal fluid
DA	Dopamine
DOPAC	3,4-Dihydroxyphenylacetic acid
EAE	Experimental autoimmune encephalitis
FTD	Frontotemporal dementia
GI	Gastrointestinal
GPR35	G-protein receptor 35
HD	Huntington’s disease
IDO-1	Indolamine 2,3-dioxygenase 1
IFNs	Interferons
KATs	Kynurenine aminotransferases
KMO	Kynurenine 3-monooxygenase
KP	Kynurenine pathway
KYN	Kynurenine
KYNA	Kynurenic acid
LBs	Lewy bodies
l-KYN	N-formyl-l-kynurenine
MPP(+)	1-Methyl-4-phenylpyridinium
MPTP	1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
MS	Multiple sclerosis
NAD+	Nicotinamide adenine dinucleotide
NMDA	N-methyl-d-aspartate
PD	Parkinson’s disease
PIC	Picolinic acid
PPMS	Primary progressive MS
QUIN	Quinolinic acid
ROS	Reactive oxygen species
RRMS	Relapsing-remitting MS
SNP	Single nucleotide polymorphism
SNpc	Pars compacta of the substance nigra
TDO	Tryptophan 2,3-dioxygenase
TDP-43	TAR DNA-binding protein 43
TRP	Tryptophan
XA	Xanthurenic acid