↑	higher
↓	lower
•OH	hydroxyl radical
3-NT	3-nitrotyrosine
4-HNE	4-hydroxy-2-nonenal
8-isop	8-isoprostanes
8-OHdG	8-hydroxy-2’- deoxyguanosine
8-OHG	8-hydroxyguanosine
AD	Alzheimer’s disease (dementia)
AGE	advanced glycation end products; AOPP – advanced oxidation protein products
ALS	amyotrophic lateral sclerosis
Aβ	amyloid-β
CAT	catalase
CG	control group
CNS	central nervous system
DLB	dementia with Lewy bodies
DNA	deoxyribonucleic acid
ER	endoplasmic reticulum
EWSR1	Ewing sarcoma RNA-binding protein 1
FTD	frontotemporal dementia;
FUS	fused-in sarcoma
GPx	glutathione peroxidase
GSH	glutathione
GSH	reduced glutathione
H2O2	hydrogen peroxide
HBV	hepatitis B virus
HCV	hepatitis C virus
HD	Huntington’s disease
HIV	human immunodeficiency virus
HO-1	Heme oxygenase-1
hs-CRP	high-sensitivity C-reactive protein
LTP	long-term potentiation
MCI	mild cognitive impairment
MDA	malondialdehyde
MMD	mild to moderate dementia (MMSE 11-23);
MMSE	Mini Mental State Examination
MxD	mixed dementias
NDDs	neurodegenerative diseases
NFTs	neurofibrillary tangles
NO	nitric oxide
Nox	nicotinamide adenine dinucleotide phosphate NADPH) oxidase
NWS	non-stimulated saliva
O2•	superoxide anion
ONOO	peroxynitrite
OS	oxidative stress
OSI	oxidative stress index
PC	protein carbonyls
PD	Parkinson’s disease
PrP	prion protein
pTau	tau protein
PUFA	polyunsaturated fatty acid
Px/SP	salivary peroxidase
RNA	ribonucleic acid
RNS	reactive nitrogen species
ROS	reactive oxygen species
SD	severe dementia (MMSE 0-10)
SG	study group
SOD	superoxide dismutase
SWS	stimulated saliva
TAC	mean total antioxidant capacity
TAF15	TATA-binding protein-associated factor15
TAS	total antioxidant status
TBARS	thiobarbituric acid reactive substances
TDP-43	transactive response (TAR) DNA-binding protein 43
TOS	mean total oxidant status
TR	thioredoxin reductase
UA	uric acid
UPDRS	Unified Parkinson’s Disease Rating Stage
VaD	vascular dementia
WHO	World Health Organization
XO	xanthine oxidase