Evidence map›Paper›PMID 33227282›Full record

ArticleGastroenterology2021

Enhanced Meningeal Lymphatic Drainage Ameliorates Neuroinflammation and Hepatic Encephalopathy in Cirrhotic Rats.

Shao-Jung Hsu, Chihao Zhang, Jain Jeong, Seong-Il Lee, Matthew McConnell, Teruo Utsumi, Yasuko Iwakiri

Open access · greenAbstract read
In one paragraph

Article in Gastroenterology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 76 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
76citing papers in PubMed, 1 pooled it
4.6field-weighted citation impact, top 4% 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

76 citing papers in PubMed, 1 synthesis or guideline pooled it, 118 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Review
  4. The role of ammonia in chronic liver disease.Hepatology communications · 2026
    Review
  5. Acta pharmaceutica Sinica. B · 2026
    Article
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  7. Article
  8. Article
  9. Article
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  12. Mechanistic insights into the liver-brain axis during chronic liver disease.Nature reviews. Gastroenterology & hepatology · 2026
    Review
  13. Article
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  15. Article
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  18. Article
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16 more citing papers are in PubMed but not listed here.

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

7 authors at 2 institutions in 2 countries.

Shao-Jung HsuDepartment of Internal Medicine, Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut; Division of Gastroenterology and Hepatology, Department of Medicine, Taipei Veterans General Hospital and Faculty of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan.
Chihao ZhangDepartment of Internal Medicine, Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut.
Jain JeongDepartment of Internal Medicine, Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut.
Seong-Il LeeDepartment of Internal Medicine, Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut.
Matthew McConnellDepartment of Internal Medicine, Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut.
Teruo UtsumiDepartment of Internal Medicine, Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut.
Yasuko IwakiriDepartment of Internal Medicine, Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut. Electronic address: yasuko.iwakiri@yale.edu.
Yale University · USNational Yang Ming Chiao Tung University · TW

Funding

Yale Clinical and Translational Science Award (U Component)UL1TR001863 · NCATS · YALE UNIVERSITY · PI John H. Krystal, LUCILA OHNO-MACHADO · 2016 to 2026
$102.9M
Yale Liver CenterP30DK034989 · NIDDK · YALE UNIVERSITY · PI YASUKO IWAKIRI · 1986 to 2026
$31.1M
Training Program in Investigative HepatologyT32DK007356 · NIDDK · YALE UNIVERSITY · PI MICHAEL H NATHANSON · 1986 to 2026
$7.4M
The role of Kupffer cells in alcohol-induced liver diseaseR01AA025342 · NIAAA · YALE UNIVERSITY · PI IWAKIRI, YASUKO · 2017 to 2021
$1.9M
Hemodynamics and hepatic remodelingR01DK117597 · NIDDK · YALE UNIVERSITY · PI IWAKIRI, YASUKO · 2018 to 2021
$1.5M
Lymphatics in the liverR56DK121511 · NIDDK · YALE UNIVERSITY · PI IWAKIRI, YASUKO · 2019 to 2019
$430k
NCATS NIH HHS UL1 TR001863NIAAA NIH HHS R01 AA025342NIDDK NIH HHS P30 DK034989NIDDK NIH HHS R01 DK117597NIDDK NIH HHS R56 DK121511NIDDK NIH HHS T32 DK007356
6 · The paper itself

Abstract

BACKGROUND &

aimsHepatic encephalopathy (HE) is a serious neurologic complication in patients with liver cirrhosis. Very little is known about the role of the meningeal lymphatic system in HE. We tested our hypothesis that enhancement of meningeal lymphatic drainage could decrease neuroinflammation and ameliorate HE.

methodsA 4-week bile duct ligation model was used to develop cirrhosis with HE in rats. Brain inflammation in patients with HE was evaluated by using archived GSE41919. The motor function of rats was assessed by the rotarod test. Adeno-associated virus 8-vascular endothelial growth factor C (AAV8-VEGF-C) was injected into the cisterna magna of HE rats 1 day after surgery to induce meningeal lymphangiogenesis.

resultsCirrhotic rats with HE showed significantly increased microglia activation in the middle region of the cortex (P < .001) as well as increased neuroinflammation, as indicated by significant increases in interleukin 1β, interferon γ, tumor necrosis factor α, and ionized calcium binding adaptor molecule 1 (Iba1) expression levels in at least 1 of the 3 regions of the cortex. Motor function was also impaired in rats with HE (P < .05). Human brains of patients with cirrhosis with HE also exhibited up-regulation of proinflammatory genes (NFKB1, IbA1, TNF-α, and IL1β) (n = 6). AAV8-VEGF-C injection significantly increased meningeal lymphangiogenesis (P = .035) and tracer dye uptake in the anterior and middle regions of the cortex (P = .006 and .003, respectively), their corresponding meninges (P = .086 and .006, respectively), and the draining lymph nodes (P = .02). Furthermore, AAV8-VEGF-C decreased microglia activation (P < .001) and neuroinflammation and ameliorated motor dysfunction (P = .024).

conclusionsPromoting meningeal lymphatic drainage and enhancing waste clearance improves HE. Manipulation of meningeal lymphangiogenesis could be a new therapeutic strategy for the treatment of HE.

Indexed as

AnimalsCell LineCerebral CortexCisterna MagnaDependovirusDisease Models, AnimalGenetic VectorsGlymphatic SystemHepatic EncephalopathyHumansLiver CirrhosisLymphangiogenesisMaleMicrogliaMotor DisordersRatsVascular Endothelial Growth Factor CLymphangiogenesisLymphatic Endothelial CellsMeningesPortal HypertensionVEGF-C

Identifiers

PMID33227282
PMCPMC7956141
OpenAlexW3102483432

What OpenQuestion holds

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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.