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Peptic Ulcer Disease I: Introduction01:30

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Peptic Ulcer Disease (PUD) is characterized by mucosal excavation in the esophagus, stomach, pylorus, or duodenum. It can manifest as acute or chronic based on the extent and duration of mucosal involvement.
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Peptic ulcer disease, commonly called PUD, represents a multifaceted condition characterized by disruptions in the lining of the gastrointestinal (GI)  tract. Central to the protection of the gastrointestinal lining is the mucosal-bicarbonate barrier. This physiological defense mechanism is a formidable shield against the corrosive effects of gastric acid and pepsin secretion in the stomach. Its role is pivotal in maintaining the structural integrity of the stomach's inner lining.
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Peptic ulcers are sores on the stomach's inner lining and the upper small intestine, which are the result of disruptions in the mucosal layer that houses parietal cells which produce gastric acid, and chief cells which secrete pepsinogen.
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A Method to Assess Bacteriocin Effects on the Gut Microbiota of Mice
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Causal Relationship Between Gut Microbiota and Pressure Ulcers: A Two-Sample Bidirectional Mendelian Randomisation

Pei Luo1, Liqing Jiang2, Hongmei Chen3

  • 1Department of Thoracic Surgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, China.

Nursing in Critical Care
|December 17, 2025
PubMed
Summary

This study used Mendelian randomization to investigate the causal link between gut microbiota and pressure ulcers (PUs). Certain gut bacteria like Coprococcus and Gordonibacter may protect against PUs, while others increase risk, suggesting microbiota-targeted interventions.

Keywords:
Mendelian randomisationcausal relationshipgut microbiotapressure ulcers

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Area of Science:

  • Genetics
  • Microbiology
  • Epidemiology

Background:

  • Pressure ulcers (PUs) are a significant clinical problem, especially in immobilized patients.
  • Alterations in gut microbiota composition are linked to PUs, but a causal relationship remains unclear.

Purpose of the Study:

  • To investigate the causal effect of gut microbiota on the risk of developing pressure ulcers using a two-sample Mendelian randomization (MR) approach.

Main Methods:

  • Utilized large-scale summary statistics for gut microbiota (MiBioGen Consortium) and pressure ulcer data (FinnGen biobank).
  • Employed various MR methods (IVW, weighted median, etc.) and sensitivity analyses to assess causality and directionality.

Main Results:

  • Identified specific gut bacteria with protective effects against PUs (e.g., Coprococcus, Gordonibacter) and those increasing risk (e.g., Anaerotruncus).
  • Reverse MR indicated potential causal effects of PUs on certain gut genera.
  • Sensitivity analyses confirmed the robustness of findings and directionality from gut microbiota to PUs.

Conclusions:

  • Provides genetic evidence for a causal role of gut microbiota in PU development.
  • Supports the potential for microbiota-targeted interventions in preventing PUs, particularly in critical care settings.