Hypertriglyceridemia‐modulated gut microbiota promotes lysophosphatidylcholine generation to aggravate acute pancreatitis in a TLR4‐dependent manner

Q: What are the key findings of this study?

Hypertriglyceridemia-modulated gut microbiota significantly upregulated glycerophospholipid metabolism and LysoPC content in a TLR4-dependent manner (p<0.05), aggravating acute pancreatitis in mice.

Q: What is the clinical evidence from this study?

Population: Hypertriglyceridemic acute pancreatitis (HTG + AP). Intervention: Hypertriglyceridemia-modulated gut microbiota (via Poloxamer-407 induction, antibiotic depletion, fecal microbiota transplantation, TLR4 knockout/antagonism with TAK-242, and LysoPC administration) vs. Control mice, AP-only mice, wild-type mice, or untreated/vehicle control. Primary outcome: Pancreatic injury, gut barrier dysfunction, glycerophospholipid metabolism, and lysophosphatidylcholine (LysoPC) levels (p=<0.05).

Q: What does this research mean for the field?

Hypertriglyceridemia-altered gut microbiota upregulates glycerophospholipid metabolism and increases lysophosphatidylcholine generation via TLR4 activation, exacerbating pancreatic injury in acute pancreatitis. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

Q: What question did this study set out to answer?

To investigate how hypertriglyceridemia-induced changes in gut microbiota influence glycerophospholipid metabolism and aggravate acute pancreatitis via Toll-like receptor 4 signaling.

Xiaofan Song; Lei Qiao; Xina Dou; Jiajing Chang; Xiaonan Zeng; Tianjing Deng; Ge Yang; Peiyun Liu; Cheng Wang; Qinhong Xu; Chunlan Xu

doi:10.1002/imt2.70003

February 1, 2025iMetaOpen Access

Hypertriglyceridemia‐modulated gut microbiota promotes lysophosphatidylcholine generation to aggravate acute pancreatitis in a TLR4‐dependent manner

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Key result

Hypertriglyceridemia-altered gut microbiota worsens acute pancreatitis via TLR4-dependent LysoPC upregulation in mice.

P<0.05

Figures

Graphical abstract published by iMeta — Graphical abstract · Published by iMeta · CC BY

Why the study?

Does hypertriglyceridemia-modulated gut microbiota promote lysophosphatidylcholine generation in a TLR4-dependent manner to aggravate pancreatic injury in mice with acute pancreatitis?

Key Points

To investigate how hypertriglyceridemia-induced changes in gut microbiota influence glycerophospholipid metabolism and aggravate acute pancreatitis via Toll-like receptor 4 signaling.
Induced hypertriglyceridemia and acute pancreatitis in wild-type and Tlr4-/- mice using caerulein and Poloxamer-407 (500 mg/kg).
Manipulated the gut microbiome using antibiotic cocktail depletion and fecal microbiota transplantation.
Evaluated primary pancreatic acinar cells treated with lipopolysaccharide with or without the TLR4 antagonist TAK-242.
Hypertriglyceridemic mice showed distinct gut microbiota composition (p = 0.027), higher Firmicutes to Bacteroidetes ratios, and elevated cecal endotoxin.
Antibiotic depletion of gut microbiota in mice downregulated 64 metabolites, primarily altering glycerophospholipid metabolism and reducing lysophosphatidylcholine (LysoPC) in serum and pancreas.
Tlr4 knockout or TAK-242 inhibition significantly decreased PLA2 expression, reduced LysoPC synthesis, and attenuated pancreatic damage and gut barrier dysfunction.

Structured PICO

Does hypertriglyceridemia-modulated gut microbiota promote lysophosphatidylcholine generation in a TLR4-dependent manner to aggravate pancreatic injury in mice with acute pancreatitis?

P

Population

Preclinical mouse models (wild-type C57BL/6 and Tlr4-/- mice) of Poloxamer-407 and caerulein-induced hypertriglyceridemic acute pancreatitis and isolated mouse primary pancreatic acinar cells.

I

Intervention

Hypertriglyceridemia induction (Poloxamer-407 500 mg/kg), antibiotic cocktail for gut microbiota depletion, fecal microbiota transplantation (FMT) of HTG-modulated microbiota, LysoPC pretreatment, and TLR4 blockade (Tlr4-/- knockout in mice or TAK-242 pretreatment in LPS-stimulated acinar cells).

C

Comparator

Control mice, AP-only mice, untreated HTG + AP mice, or wild-type (WT) mice.

O

Outcome

Pancreatic injury severity (histological damage, myeloperoxidase expression, serum lipase and amylase activities), systemic inflammation (IL-1beta, TNF-alpha), gut barrier function and bacterial translocation, and glycerophospholipid metabolism (PLA2 and LysoPC levels in serum and pancreas).surrogate

Main Result

p-value: p=<0.05

Identifies the gut microbiota-TLR4-PLA2-LysoPC axis as a key mechanism by which hypertriglyceridemia exacerbates acute pancreatitis in mice, suggesting potential therapeutic targets for hypertriglyceridemic acute pancreatitis.

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Implication

Hypothesis-generating for targeting the gut-pancreas axis in hypertriglyceridemic acute pancreatitis; leaves open whether this pathway translates to human disease or clinical practice.

Abstract

Hypertriglyceridemia (HTG) can lead to the disorder of gut microbiota in mice, resulting in the increase of endotoxin content. HTG can also aggravate the damage of intestinal barrier function and intestinal bacterial translocation in acute pancreatitis (AP) mice. Toll-like receptor 4 gene (Tlr4) knockout can significantly reduce gut permeability and endotoxin invasion in AP mice. In addition, HTG-modulated gut microbiota could up-regulate glycerophospholipid metabolism and increase lysophosphatidylcholine (LysoPC) content in a TLR4-dependent manner, thereby aggravating pancreatic injury in AP.

Discussion

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Cite This Study

Song et al. (2025) studied Hypertriglyceridemic acute pancreatitis (HTG + AP). Hypertriglyceridemia-modulated gut microbiota (via Poloxamer-407 induction, antibiotic depletion, fecal microbiota transplantation, TLR4 knockout/antagonism with TAK-242, and LysoPC administration) vs. Control mice, AP-only mice, wild-type mice, or untreated/vehicle control was evaluated on Pancreatic injury, gut barrier dysfunction, glycerophospholipid metabolism, and lysophosphatidylcholine (LysoPC) levels (p=<0.05). Hypertriglyceridemia-modulated gut microbiota significantly upregulated glycerophospholipid metabolism and LysoPC content in a TLR4-dependent manner (p<0.05), aggravating acute pancreatitis in mice.

synapsesocial.com/papers/6a7ba796169fe1af7cc28820 https://doi.org/10.1002/imt2.70003

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Hypertriglyceridemia‐modulated gut microbiota promotes lysophosphatidylcholine generation to aggravate acute pancreatitis in a TLR4‐dependent manner

Figures

Key Points

Structured PICO

Main Result

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Implication

Abstract

Discussion

Cite This Study

Hypertriglyceridemia‐modulated gut microbiota promotes lysophosphatidylcholine generation to aggravate acute pancreatitis in a TLR4‐dependent manner

Figures

Key Points

Structured PICO

Main Result

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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