Mechanosensing and IL-13 Signaling Synergistically Modulate Intestinal Stem Cell Differentiation via STAT6 and YAP

Abstract A long-term complication of chronic inflammation is the mechanical stiffening of the tissue, culminating in fibrosis. Fibrosis can severely disrupt tissue function and is a major risk factor for other diseases. It is not currently well understood how fibrosis impacts the response to inflammatory signals. To address this, we investigated cross-talk between cellular mechanosensing and the response to Interleukin (IL)-13, a cytokine associated with inflammatory bowel diseases (IBDs). Using 3D intestinal organoids and organoid monolayer culture, we uncovered a synergy between mechanosensing and IL-13 signaling in regulating intestinal stem cell differentiation. Through quantitative high-resolution microscopy and functional inhibition, we found that this response requires activation of STAT6, a known mediator of IL-13. Both IL-13 and high substrate stiffness increase cellular traction forces and focal adhesion formation, but at the expense of reduced tension at cell-cell junctions and compromised epithelial barrier function. The mechanosensing and IL-13 responses require actomyosin contractility and YAP, which is activated downstream of a positive feedback loop involving STAT6-dependent myosin-2 activation. Our results establish a novel STAT6-YAP signaling axis that integrates inflammatory and mechanical cues to regulate intestinal cell fate and barrier integrity, opening new avenues to target epithelial dysfunction in fibrosis, chronic inflammation and regenerative medicine. Competing Interest Statement The authors have declared no competing interest.