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Glymphatic failure as a final common pathway to dementia
Nedergaard M, Goldman SA. Science, 2020-10-02
Topic: Risk, prevention and care in population studies
This is a scientific review/perspective article, not a new experiment, that synthesizes evidence — largely from animal studies plus some human data — proposing that failure of the glymphatic system (the brain's sleep-dependent waste-clearance network) may be a shared underlying pathway across many forms of dementia. It argues that as the glymphatic system weakens with age and poor sleep, waste proteins like amyloid and tau build up and trigger neurodegeneration; this is a synthesized hypothesis backed by substantial evidence, not a definitively proven causal chain in humans. Note: this article's full text was paywall-blocked even via a reader proxy; its inclusion here relies on corroborating secondary sources (PubMed metadata and independent coverage), not a direct read of the full text.
Key findings
- Glymphatic clearance is primarily active during sleep and declines with age
- Disrupted sleep architecture is proposed as an early contributor to the onset and progression of several neurodegenerative dementias
- Impaired glymphatic clearance is proposed to allow buildup of amyloid-beta, tau, and alpha-synuclein, triggering neuroinflammation
- Cardiovascular changes (reduced cardiac output, arterial stiffness) are also proposed to reduce glymphatic flow
Why it matters
This review proposes that failure of the brain's sleep-dependent waste-clearance system may be a shared pathway across many forms of dementia. It is a synthesized hypothesis backed largely by animal studies, not a proven causal chain in humans.
Study details
- Evidence strengthEarly
Limitations
This is a review/perspective synthesizing mostly animal and some human evidence, not primary data; the full text could not be directly accessed even via a reader proxy, so inclusion here relies on PubMed metadata and independent secondary coverage rather than a direct read.
How this study scored 39/100
Published in a top-tier journal. Scored zero for study design, sample size, effect reported, studied in people, randomised / blinded and indexed in PubMed because the record does not state it. We have no data on journal's citation record, times cited, citations per year, impact for its field and year, still being cited, senior author's track record, institution's track record, multi-centre collaboration and free to read, so those were left out: it earned 24 of the 62 points we could judge it on, which is 39 out of 100.
| Component | Points | Why |
|---|---|---|
| Journal tier | 10 / 10 | Tier 1 — top-tier general journal (Science) |
| Journal's citation record | — / 4 | No journal record from OpenAlex — left out of this score |
| Study design | 0 / 12 | No study design recorded — scores zero, not guessed (not stated in the record — scored 0) |
| Strength of evidence | 2 / 5 | Rated “early” in our summary |
| Peer-review validation | 10 / 10 | Peer-reviewed. Published as an article in a named peer-reviewed journal. |
| How recent | 2 / 5 | 2020 — within 10 year(s) of the newest study here |
| Sample size | 0 / 4 | Participant count not stated — scores zero (not stated in the record — scored 0) |
| Effect reported | 0 / 3 | No effect size reported — scores zero (not stated in the record — scored 0) |
| Studied in people | 0 / 3 | Not stated whether this was studied in people — scores zero (not stated in the record — scored 0) |
| Randomised / blinded | 0 / 2 | No randomisation or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | — / 7 | No citation count (not found in OpenAlex) — left out of this score |
| Citations per year | — / 5 | No citation count or no year — left out of this score |
| Impact for its field and year | — / 6 | No field-weighted citation impact (OpenAlex has none yet) — left out of this score |
| Cited by studies here | 0 / 6 | No other study in this library cites it |
| Still being cited | — / 4 | No yearly citation counts — left out of this score |
| Senior author's track record | — / 4 | Senior author's record not available — left out of this score |
| Institution's track record | — / 3 | No institution listed in OpenAlex — left out of this score |
| Multi-centre collaboration | — / 3 | Institutions not listed — left out of this score |
| Indexed in PubMed | 0 / 2 | No PubMed ID and no DOI — scores zero (not stated in the record — scored 0) |
| Free to read | — / 2 | Access not recorded — left out of this score |
| Points | 24 / 62 | Scored on 11 of 20 parts. We have no data for the rest, so they are left out: 24 of the 62 points we could judge it on is 39 out of 100. |
| Total | 39 / 100 | — |
What each of these 20 components measures, and what this score is not →
Read the original
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Cite this study APA, Vancouver, BibTeX · download .bib or .ris
Built from the record alzhub holds for this paper, not looked up. This record has no DOI, so the citation leaves it out. Volume, issue and page numbers are not held in the record. Check the citation against the original before you use it.
APA 7th
Nedergaard, M., & Goldman, S. A. (2020). Glymphatic failure as a final common pathway to dementia. Science.
Vancouver
Nedergaard M, Goldman SA. Glymphatic failure as a final common pathway to dementia. Science. 2020. PMID: 33004510.
BibTeX
@article{nedergaard2020-d2a1b9b3,
author = {Nedergaard, M. and Goldman, S. A.},
title = {{Glymphatic failure as a final common pathway to dementia}},
journal = {Science},
year = {2020},
pmid = {33004510}
}
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