T2DM	Type 2 diabetes mellitus
DPP-4	Dipeptidyl peptidase-4
HFD	High-fat diet
LFD	Low-fat diet
AD	Alzheimer’s disease
Aβ	β-amyloid
NFT	neurofibrillary tangle
GLP-1	glucagon-like peptide-1
FTDP-17	frontotemporal dementia and parkinsonism linked to chromosome 17
CBF	cerebral blood flow
MAPT	microtubule-associated protein tau
Prnp	prion protein promoter
PCR	polymerase chain reaction
MWM	Morris water maze test
NO	nitric oxide
EDHF	endothelium-derived hyperpolarizing factor
eNOS	endothelial nitric oxide synthase
PBS	phosphate buttered saline
RIPA	radio-immunoprecipitation assay
PVDF	polyvinylidene difluoride
DAB	diaminobenzidine