Interleukin-11 causes alveolar type 2 cell dysfunction and prevents alveolar regeneration

Area of Science:

• Pulmonary Medicine
• Cell Biology
• Regenerative Medicine

Background:

• Aberrant basaloid cells expressing KRT8 in lung disease impair tissue repair.
• These cells are linked to pathological remodeling in interstitial lung disease.

Purpose of the Study:

• To investigate the role of Interleukin-11 (IL11) in KRT8+ aberrant basaloid cells in lung fibrosis.
• To determine if IL11 signaling impacts alveolar epithelial cell differentiation and lung regeneration.

Main Methods:

• Analysis of single-cell RNA sequencing datasets from human interstitial lung disease.
• In vitro stimulation of alveolar epithelial cells with IL11.
• In vivo inhibition of IL11 signaling in a mouse model of lung fibrosis.

Main Results:

• IL11 is highly expressed in KRT8+ basaloid cells in human and mouse fibrotic lung disease.
• IL11 stimulation induces epithelial-to-mesenchymal transition and stalls alveolar type 2 (AT2)-to-AT1 cell differentiation.
• IL11 inhibition in vivo prevents KRT8+ cell accumulation, enhances AT1 cell differentiation, and blocks fibrogenesis.

Conclusions:

• IL11 acts as a key profibrotic mediator by inhibiting reparative AT2-to-AT1 cell differentiation.
• IL11 signaling limits endogenous alveolar regeneration, contributing to fibrotic lung disease.
• Targeting IL11 signaling represents a promising therapeutic strategy for fibrotic lung diseases.