Robust pan-junctional reinforcement preserves the gut epithelial barrier under mechanical stress.

Feces-driven mechanical distension in the adult colon triggers pan-junctional reinforcement, with NMMII activation required to prevent disorganized junctions and barrier breach.

• Why it matters: The colon experiences repeated mechanical distension that could compromise epithelial barrier integrity, but the mechanoadaptive remodeling and its requirements were unclear.
• What they did: The study tracked junctional protein enrichment across tight junctions, adherens junctions, and desmosomes during distension, including sustained ZO-1, E-cadherin, desmocollin 2, and plakoglobin, and a 15 min peak for desmoplakin and keratin 8, while testing genetic, pharmacological, and mechanical perturbations.
• The result: NMMII activation was required for mechanoadaptation, depending on extracellular calcium and mechanosensitive ion channel activity; loss of NMMII impaired junctional responses across all three junctional complexes and led to barrier breach.

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