Mechanical control of lung regeneration by mesothelial cells.

Mesothelial cells in mouse lungs sense mechanical stretch and prevent overdistension during regrowth after pneumonectomy by depositing extracellular matrix proteins on the lung surface, linked to a key number: 1.

• Why it matters: Lung regeneration must balance expansion with structural integrity, yet how surface cells translate mechanical cues into limits on regrowth—and how this goes wrong in fibrosis—remains unclear.
• What they did: Yang et al. show that mesothelial cells respond to stretch and regulate lung surface extracellular matrix deposition during regrowth after pneumonectomy in mice.
• The result: This stretch-linked matrix deposition mechanism is aberrantly activated in fibrotic lung disease, implying it may contribute to pathological remodeling during regeneration.

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