SCEP	Sea cucumber eggs oligopeptides
AD	Alzheimer’s disease
FMT	Fecal microbiota transplantation
AlCl3	Aluminum chloride
D-gal	D-galactose
Aβ	β-Amyloid
P-Tau	Phosphorylated tau protein
SCFAs	Short-chain fatty acids
BCA	Bicinchoninic Acid Assay
TJ	Tight junctions
CNS	Central nervous system
MWM	Morris water maze
HE	Hematoxylin–eosin staining
ZO-1	Right junction protein 1
claudin 5	Compact linking protein 5
HDAC3	Histone deacetylase 3
GFAP	Glial fibrillary acidic protein
NF-L	Neurofilament light chain
MCT-1	Monocarboxylate transporter-1
MUC4	Mucin-4
LC-MS	Liquid chromatography–mass spectrometry
PVDF	Polyvinylidene difluoride
GAPDH	Glyceraldehyde-3-phosphate dehydrogenase
DG	Dentate gyrus
BBB	Blood–brain barrier
NT3	Neurotrophin-3
BDNF	Brain-derived neurotrophic factor
DAPI	4′,6-Diamidino-2′-phenylindole
PD	Parkinson’s disease