25(OH)D	25-hydroxyvitamin D
27-OHC	27-hydroxycholesterol
5LO	5-lipoxygenase
AA	Anthranilic acid
AD	Alzheimer’s disease
ADMA	Asymmetric dimethylarginine
ALA	Alpha-lipoic acid
ApoE	Apolipoprotein E
APP	Amyloid precursor protein
Aβ	Amyloid β
BBB	Blood–brain barrier
BHMT	Betaine-homocysteine methyltransferase
CBF	Cerebral blood flow
cECs	Cerebral endothelial cells
CH2THF	5,10-Methylenetetrahydrofolate
CH3THF	5-methyltetrahydrofolate
CNS	Central nervous system
COMT	Catechol-O-methyltransferase
CSF	Cerebrospinal fluid
DDAH	Dimethylarginine dimethylaminohydodrolase
DMA	Dimethylamine
DMG	Dimethylglycine
DM-PP2Ac	De-methylated PP2A catalytic subunit
DR4/5	Death receptor 4 and 5
EAE	Autoimmune encephalomyelitis
EDSS	Expanded Disability Status Score
ET	Endothelin
FAD	Flavin adenine dinucleotide
HAA	3-hydroxyanthranilic acid
HCs	Healthy controls
HCTL	Homocysteine thiolactone
Hcy	Homocysteine
HHcy	Hyperhomocysteinemia
HK	3-hydroxykynurenine
iNOS	inducible Nitric Oxide Synthase
KA	Kynurenic acid
KAT	Kynurenine aminotransferase
Kyn	kynurenine
KYNU	Kynureninase
MBP	Myelin basic protein
MCI	Mild Cognitive Impairment
MeSe	Methionine synthase
MMA	Methylmalonic acid
MOG	Myelin oligodendrocyte glycoprotein
M-PP2Ac	Methylated PP2A catalytic subunit
MS	Multiple sclerosis
MSSS	Multiple Sclerosis Severity Score
MTHFR	Methylenetetrahydrofolate reductase
NMO	Neuromyelitis optica
NO	Nitric oxide
NOS	Nitric oxide synthase
ONDs	Other neurologic diseases
PD	Parkinson’s disease
PLP	Pyridoxal 5-phosphate
PP2A	Protein phosphatase 2A
PRMT-1	Protein arginine methyltransferases-1
PRMT-4	Protein arginine methyltransferase-4
PS1	Presenilin 1
pS262-tau	Ser262 hyperphosphorylated tau
PTMs	Post-translational modifications
ROS	Reactive oxygen species
RR	Relapsing–remitting
SAH	S-adenosyl homocysteine
SAM	S-adenosyl methionine
SDMA	Symmetric dimethylarginine
SP	Secondary progressive
TCA	Tricarboxylic acid
THF	Tetrahydrofolate
tHcy	Total homocysteine
VCID	Cognitive impairment and dementia
XA	Xanthurenic acid