Evidence map›Paper›PMID 37147392›Full record

ReviewNPJ Parkinson's disease2023

Gastrointestinal disorders in Parkinson's disease and other Lewy body diseases.

Masaaki Hirayama, Hiroshi Nishiwaki, Tomonari Hamaguchi, Kinji Ohno

Open access · goldAbstract readReview
In one paragraph

Review in NPJ Parkinson's disease, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed, 1 pooled it
13.8field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 1 synthesis or guideline pooled it, 44 citations in OpenAlex.

  1. Pooled it
  2. A qPCR-based approach targeting the microbial gene markerJournal of Parkinson's disease · 2026
    Article
  3. Gut microbiota in health and disease.Molecular biomedicine · 2026
    Review
  4. Article
  5. Article
  6. Review
  7. Article
  8. Frontiers in microbiology · 2026
    Article
  9. Review
  10. Review
  11. Review
  12. Article
  13. Article
  14. Blood microbiome signatures in the REM sleep behavior disorder-Lewy body disease continuum.Journal of neural transmission (Vienna, Austria : 1996) · 2025
    Article
  15. Article
  16. Article
  17. Article
  18. Review
  19. Article
  20. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Masaaki HirayamaDepartment of Pathophysiological Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan. hirasan@met.nagoya-u.ac.jp.ORCID http://orcid.org/0000-0003-0092-7837
Hiroshi NishiwakiDivision of Neurogenetics, Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine, Nagoya, Japan.
Tomonari HamaguchiDivision of Neurogenetics, Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine, Nagoya, Japan.
Kinji OhnoDivision of Neurogenetics, Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine, Nagoya, Japan. ohnok@med.nagoya-u.ac.jp.ORCID http://orcid.org/0000-0002-1529-2750
Nagoya University · JP

Funding

Japan Agency for Medical Research and Development (AMED) JP21gm1010002, JP22bm0804005, and JP22ek0109488MEXT | Japan Society for the Promotion of Science (JSPS) JP20H03561MEXT | Japan Society for the Promotion of Science (JSPS) JP22K15394MEXT | Japan Society for the Promotion of Science (JSPS) JP22K17343Ministry of Health, Labour and Welfare (Ministry of Health, Labour and Welfare, Japan) 20FC1036National Center of Neurology and Psychiatry (NCNP) 2-5
6 · The paper itself

Abstract

Parkinson's disease (PD) is pathologically characterized by the abnormal accumulation of α-synuclein fibrils (Lewy bodies) in the substantia nigra and other brain regions, although the role of Lewy bodies remains elusive. Constipation usually precedes the motor symptoms in PD, which is in accordance with the notion that α-synuclein fibrils start from the intestinal neural plexus and ascend to the brain in at least half of PD patients. The gut microbiota is likely to be involved in intestinal and brain pathologies. Analyses of the gut microbiota in PD, rapid-eye-movement sleep behavior disorder, and dementia with Lewy bodies suggest three pathological pathways. First, Akkermansia, which is increased in PD, degrades the intestinal mucus layer and increases intestinal permeability, which triggers inflammation and oxidative stress in the intestinal neural plexus. Second, decreased short-chain fatty acids (SCFAs)-producing bacteria in PD reduce the number of regulatory T cells. Third, SCFAs also aggravate microglial activation with an unelucidated pathway. In addition, in dementia with Lewy bodies (DLB), which is another form of α-synucleinopathies, increased genera, Ruminococcus torques and Collinsella, may mitigate neuroinflammation in the substantia nigra by increasing secondary bile acids. Interventions for the gut microbiota and their metabolites may potentially delay or mitigate the development and progression of PD and other Lewy body diseases.

Identifiers

PMID37147392
PMCPMC10160728
OpenAlexW4372332826

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.