Evidence map›Paper›PMID 40119011›Full record

ArticleCommunications biology2025

Roles of TLR4 in macrophage immunity and macrophage-pulmonary vascular/lymphatic endothelial cell interactions in sepsis.

Yu Fu, Ting Gong, Patricia A Loughran, Yuehua Li, Timothy R Billiar, Youtan Liu, Zongmei Wen, Jie Fan

Abstract read
In one paragraph

Article in Communications biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
–field-weighted citation impact
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

20 citing papers in PubMed.

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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

8 authors.

Yu Fu *Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15213, USA.ORCID http://orcid.org/0000-0003-0881-7165
Ting Gong *Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15213, USA.ORCID http://orcid.org/0000-0001-9732-7162
Patricia A LoughranDepartment of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15213, USA.
Yuehua LiDepartment of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15213, USA.
Timothy R BilliarDepartment of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15213, USA.ORCID http://orcid.org/0000-0002-2949-0811
Youtan LiuDepartment of Anesthesiology, Shenzhen Hospital of Southern Medical University, Shenzhen, 518110, China.
Zongmei WenDepartment of Anesthesiology, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China.
Jie FanDepartment of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, 15213, USA. jif7@pitt.edu.ORCID http://orcid.org/0000-0002-0090-2704

Funding

Mechanism of Trauma/Hemorrhagic Shock-Predisposed SepsisR21AI185275 · NIAID · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI FAN, JIE · 2024 to 2025
$437k
BLRD VA I01 BX004838BLRD VA IK6 BX006297NIAID NIH HHS R21 AI185275
6 · The paper itself

Abstract

In sepsis, acute lung injury (ALI) is a severe complication and a leading cause of death, involving complex mechanisms that include cellular and molecular interactions between immune and lung parenchymal cells. In recent decades, the role of Toll-like receptor 4 (TLR4) in mediating infection-induced inflammation has been extensively studied. However, how TLR4 facilitates interactions between innate immune cells and lung parenchymal cells in sepsis remains to be fully understood. This study aims to explore the role of TLR4 in regulating macrophage immunity and metabolism in greater depth. It also seeks to reveal how changes in these processes affect the interaction between macrophages and both pulmonary endothelial cells (ECs) and lymphatic endothelial cells (LECs). Using TLR4 knockout mice and the combined approaches of single-cell RNA sequencing and experimental validation, we demonstrate that in sepsis, TLR4-deficient macrophages upregulate Abca1, enhance cholesterol efflux, and reduce glycolysis, promoting M2 polarization and attenuating inflammation. These metabolic and phenotypic shifts significantly affect their interactions with pulmonary ECs and LECs. Mechanistically, we uncovered that TLR4 operates through multiple pathways in endothelial dysfunction: macrophage TLR4 mediates inflammatory damage to ECs/LECs, while endothelial TLR4 both directly sensitizes cells to lipopolysaccharide-induced injury and determines their susceptibility to macrophage-derived inflammatory signals. These findings reveal the complex role of TLR4 in orchestrating both immune-mediated and direct endothelial responses during sepsis-induced ALI, supporting that targeting TLR4 on multiple cell populations may present an effective therapeutic strategy.

Indexed as

Cell CommunicationEndothelial CellsLungMacrophagesSepsisToll-Like Receptor 4AnimalsMaleMiceMice, Inbred C57BLMice, KnockoutTlr4 protein, mouseToll-Like Receptor 4

Identifiers

PMID40119011
PMCPMC11928643

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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.