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Intestinal Barrier Dysfunction Module

Module intestinal_barrier_dysfunction 1 disorder Pathograph 9
A conserved intestinal pathophysiology module representing convergent mechanisms that produce diarrhea through epithelial injury, junctional disruption, increased mucosal permeability, impaired absorption, and downstream fluid loss. The initiating insult varies across immune-mediated enteritides, treatment-related mucositis, dysbiosis-associated inflammation, and related disorders, but the downstream sequence repeatedly converges on barrier failure and diarrheal output.
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Pathophysiology Nodes

7
7 shared nodes are defined in this module.
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Cell Types

3
intestinal epithelial cell CL:0002563 Cell Ontology (CL) Relation: this mechanism module involves this cell type This mechanism module involves intestinal epithelial cell (CL:0002563). CL:0002563 is a cell type from the Cell Ontology. enterocyte CL:0000584 Cell Ontology (CL) Relation: this mechanism module involves this cell type This mechanism module involves enterocyte (CL:0000584). CL:0000584 is a cell type from the Cell Ontology. monocyte CL:0000576 Cell Ontology (CL) Relation: this mechanism module involves this cell type This mechanism module involves monocyte (CL:0000576). CL:0000576 is a cell type from the Cell Ontology.
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Biological Processes

4
apoptotic process GO:0006915 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased apoptotic process (GO:0006915). GO:0006915 is a biological process from the Gene Ontology. INCREASED tight junction assembly GO:0120192 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves decreased tight junction assembly (GO:0120192). GO:0120192 is a biological process from the Gene Ontology. DECREASED inflammatory response GO:0006954 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased inflammatory response (GO:0006954). GO:0006954 is a biological process from the Gene Ontology. INCREASED intestinal absorption GO:0050892 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves decreased intestinal absorption (GO:0050892). GO:0050892 is a biological process from the Gene Ontology. DECREASED
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Experimental Models / Non-animal Systems

2
Primary human small-intestinal monolayer barrier model PRIMARY CELL CULTURE
Polarized primary human small-intestinal epithelial monolayers grown on a permeable scaffold to study epithelial injury, permeability, and luminal to basolateral flux.
Models: Epithelial Stress and Injury, Paracellular Barrier Leak
PMID:29094594
Celiac monocyte-epithelial coculture barrier model CO CULTURE
Human CD14-positive monocytes from patients or controls cocultured with intestinal epithelial cells to study cytokine-driven changes in barrier resistance and tight-junction composition.
Models: Paracellular Barrier Leak
PMID:31717494
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Used By Disorder Entries

1
Chemotherapy-Induced Diarrhea via Crypt stem/progenitor apoptosis and epithelial injury → Epithelial Stress and Injury , MLCK/actomyosin-mediated tight-junction remodeling → MLCK/Actomyosin-Mediated Tight Junction Remodeling , Paracellular barrier leak and mucosal break formation → Paracellular Barrier Leak , Dysbiosis-associated inflammatory amplification → Luminal Access and Inflammatory Amplification , Enterocyte apoptosis, villus blunting, and surface loss → Villus Blunting and Surface Loss , Reduced fluid absorption and diarrheal output → Absorptive Failure and Transport Dysregulation
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Pathograph

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Pathograph: causal mechanism network for Intestinal Barrier Dysfunction Module Interactive directed graph showing how this shared module's pathophysiology nodes connect.
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Pathophysiology

7
Epithelial Stress and Injury
trigger
Immune-mediated, toxic, microbial, or treatment-related insults injure the intestinal mucosa and epithelial compartment. Across diseases, this includes crypt injury, enterocyte apoptosis, and failed epithelial renewal that destabilize the epithelial surface before overt barrier leak or malabsorptive failure becomes clinically evident.
intestinal epithelial cell CL:0002563 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves intestinal epithelial cell (CL:0002563). CL:0002563 is a cell type from the Cell Ontology. enterocyte CL:0000584 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves enterocyte (CL:0000584). CL:0000584 is a cell type from the Cell Ontology.
apoptotic process GO:0006915 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased apoptotic process (GO:0006915). GO:0006915 is a biological process from the Gene Ontology. INCREASED
Used by disorders
Chemotherapy-Induced Diarrhea as Crypt stem/progenitor apoptosis and epithelial injury
Downstream
  • MLCK/Actomyosin-Mediated Tight Junction Remodeling
  • Villus Blunting and Surface Loss
MLCK/Actomyosin-Mediated Tight Junction Remodeling
amplifier
Barrier-disrupting stimuli can activate myosin light chain kinase (MLCK), increase myosin II regulatory light chain (MLC) phosphorylation, and drive perijunctional actomyosin contraction. This remodels tight-junction architecture and primes the epithelium for increased paracellular flux.
intestinal epithelial cell CL:0002563 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves intestinal epithelial cell (CL:0002563). CL:0002563 is a cell type from the Cell Ontology.
tight junction assembly GO:0120192 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves decreased tight junction assembly (GO:0120192). GO:0120192 is a biological process from the Gene Ontology. DECREASED
actomyosin GO:0042641 Gene Ontology (GO) Relation: this pathophysiological event involves this cellular component This pathophysiological event involves actomyosin (GO:0042641). GO:0042641 is a cellular component from the Gene Ontology.
Used by disorders
Chemotherapy-Induced Diarrhea as MLCK/actomyosin-mediated tight-junction remodeling
Downstream
  • Paracellular Barrier Leak
Paracellular Barrier Leak
amplifier
Junctional remodeling and tight-junction protein loss reduce epithelial resistance and increase paracellular permeability. The result is a leak-prone surface that permits flux of solutes and luminal contents across the epithelial barrier and can directly contribute to leak-flux diarrhea.
intestinal epithelial cell CL:0002563 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves intestinal epithelial cell (CL:0002563). CL:0002563 is a cell type from the Cell Ontology.
tight junction assembly GO:0120192 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves decreased tight junction assembly (GO:0120192). GO:0120192 is a biological process from the Gene Ontology. DECREASED
Used by disorders
Chemotherapy-Induced Diarrhea as Paracellular barrier leak and mucosal break formation
Downstream
  • Luminal Access and Inflammatory Amplification
  • Diarrhea
Luminal Access and Inflammatory Amplification
amplifier
Increased permeability permits microbial products, dietary antigens, toxins, and other luminal contents to access the mucosa more readily. This amplifies local cytokine responses and sustains the inflammatory state, reinforcing epithelial damage and creating a self-perpetuating barrier-failure loop.
monocyte CL:0000576 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves monocyte (CL:0000576). CL:0000576 is a cell type from the Cell Ontology. intestinal epithelial cell CL:0002563 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves intestinal epithelial cell (CL:0002563). CL:0002563 is a cell type from the Cell Ontology.
inflammatory response GO:0006954 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased inflammatory response (GO:0006954). GO:0006954 is a biological process from the Gene Ontology. INCREASED
Used by disorders
Chemotherapy-Induced Diarrhea as Dysbiosis-associated inflammatory amplification
Downstream
  • Absorptive Failure and Transport Dysregulation
Villus Blunting and Surface Loss
effector
Enterocyte apoptosis and impaired epithelial renewal shorten villi, reduce epithelial surface area, and diminish the absorptive interface available for nutrient and fluid uptake.
enterocyte CL:0000584 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves enterocyte (CL:0000584). CL:0000584 is a cell type from the Cell Ontology.
Used by disorders
Chemotherapy-Induced Diarrhea as Enterocyte apoptosis, villus blunting, and surface loss
Downstream
  • Absorptive Failure and Transport Dysregulation
Absorptive Failure and Transport Dysregulation
effector
Reduced absorptive surface area together with inflammatory reprogramming of epithelial transport lowers effective fluid and electrolyte absorption. In parallel, altered transporter activity promotes water retention within the intestinal lumen, coupling malabsorptive failure to diarrheal output.
enterocyte CL:0000584 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves enterocyte (CL:0000584). CL:0000584 is a cell type from the Cell Ontology.
intestinal absorption GO:0050892 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves decreased intestinal absorption (GO:0050892). GO:0050892 is a biological process from the Gene Ontology. DECREASED
Used by disorders
Chemotherapy-Induced Diarrhea as Reduced fluid absorption and diarrheal output
Downstream
  • Diarrhea
Diarrhea
consequence
The combined effects of paracellular leak, inflammatory exudation, and reduced absorptive capacity increase stool water content and frequency. The phenotype may be driven predominantly by leak-flux or malabsorptive mechanisms, but the convergent outcome is diarrheal fluid loss.