| ISF | Interstitial fluid |
| CNS | Central nervous system |
| BBB | Blood-brain barrier |
| BCSFB | Blood-cerebrospinal fluid barrier |
| CP | Choroid plexus |
| CSF | Cerebrospinal fluid |
| Aβ | Amyloid β |
| GLUT | Glucose transporter |
| SGLT | Sodium/glucose cotransporter |
| AD | Alzheimer disease |
| Me-4-FDG | α-methyl-4-deoxy-4-[18F]fluoro-D-glucopyranoside |
| T2DM | Type 2 diabetes mellitus |
| PET | Positron emission tomography |
| PD | Parkinson’s disease |
| ALS | Amyotrophic lateral sclerosis |
| URAT1 | Urate transporter 1 |
| BCRP | Breast cancer resistance protein |
| ABC | ATP-binding cassette |
| FDG | 18F-fluorodeoxyglucose |
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