AA	anthranilic acid
Aβ	amyloid-β
AD	Alzheimer’s disease
AhR	aryl hydrocarbon receptor
AIDS	acquired immune deficiency syndrome
ALS	amyotrophic lateral sclerosis
AMPA	α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid
APC	antigen-presenting cell
ASC	apoptosis-associated speck-like protein containing caspase activation and recruitment domains
BBB	blood–brain barrier
CA	cinnabarinic acid
CD	cluster of differentiation
Cdh1	cadherin 1
CARD	caspase activation and recruitment domains
cART	combination antiretroviral therapies
CCL5	C–C motif chemokine ligand 5
CJD	Creutzfeldt–Jakob disease
CNS	central nervous system
CSF	cerebrospinal fluid
DLB	dementia with Lewy bodies
GC	glucocorticoid
GPR35	G-protein-coupled receptor 35
3-HAA	3-hydroxy-anthralinic acid
HAND	HIV-associated neurocognitive disorders
HD	Huntington’s disease
HIV	human immunodeficiency virus
3-HK	3-hydroxy-kynurenine
IFN	interferon
LB	Lewy body
IL	interleukin
KAT	kynurenine aminotransferase
KMO	kynurenine-3-monooxygenase
KYN	kynurenine
KYNA	kynurenic acid
MIP	macrophage inflammatory proteins
MS	multiple sclerosis
ND	neurodegenerative diseases
NMDA	N-methyl-d-aspartate
OA	oxidative stress
PA	picolinic acid
PD	Parkinson’s disease
PLP	pyridoxal phosphate
PrPC	cellular prion protein
PrPSc	scrapie isoform of the prion protein
QA	quinolinic acid
RANTES	regulated upon activation, normal T cell expressed, and presumably secreted
RBC	red blood cell
RNS	reactive nitrogen species
ROS	reactive oxygen species
SND	stroke-induced secondary neurodegeneration
TDO	tryptophan dioxygenase
TDP	transactive response DNA-binding protein
TGF	transforming growth factor
Th	T helper
TNF	tumor necrosis factor
Tregs	regulatory T cells
TRP	tryptophan
VEGF	vascular endothelial growth factor
XA	xanthurenic acid