AD	Alzheimer’s disease
PD	Parkinson’s disease
PLA	Polylactic acid
PGA	Polyglycolic acid
PLGA	Poly D,L-lactide-co-glycolide
PVA	Polyvinyl alcohol
PCL	Poly (ε-caprolactone)
PNPCL	Poly (N-isopropylacrylamide)-b-poly(3-caprolactone)
PACA	Poly (alkyl cyanoacrylate)
PBCA	Poly (butyl cyanoacrylate)
PEG	Polyethylene glycol
P80	Polysorbate 80
P188	Poloxamer 188
HSA	Human serum albumin
CS	Chitosan
CPP	Cell-penetrating peptides
BBB	Blood–brain barrier
CNS	Central nervous system
GE	Gelatin
NDDs	Neurodegenerative diseases
MS	Multiple sclerosis
NPs	Nanoparticles
RES	Reticuloendothelial system
ROS	Reactive oxygen species
SOD	Superoxide dismutase
CSF	Cerebrospinal fluid
IV	Intravenous
IN	Intranasal
MDR	Multidrug resistance
NT-1	Neurotoxin-I
TRH	Thyrotropin-releasing hormone
Lf	Lactoferrin
LDLR	Low-density lipoprotein receptor
DOX	Doxorubicin
Aβ	Amyloid beta
GABA	Gamma-aminobutyric acid
TMZ	Temozolomide
Tf	Transferrin
TMC	Trimethylated chitosan (TMC)
GCTB	Gemcitabine
NGF	Nerve growth factor
Apo	Apolipoprotein
IFNβ-1b	Interferon β-1b