Quantifying extracellular matrix turnover in human lung scaffold cultures.

Area of Science:

• Biomedical Engineering
• Cell Biology
• Biochemistry

Background:

• Tissue remodelling relies on balancing extracellular matrix (ECM) production and degradation.
• Understanding cellular mechanisms for this balance during regeneration is crucial but limited.

Purpose of the Study:

• To quantify the balance between matrix production and degradation at a proteome-wide scale.
• To investigate cell-ECM interactions during tissue regeneration using decellularized lung scaffolds.

Main Methods:

• Decellularized lung scaffolds were repopulated with allogenic lung fibroblasts.
• Cells were cultured with stable isotope-labeled amino acids to track protein synthesis.
• Proteome-wide analysis quantified matrisome protein dynamics over time.

Main Results:

• Temporal dynamics of matrisome proteins correlated with cell proliferation and ECM deposition.
• Early culture showed high production of cell adhesion proteins (e.g., emilin-1, fibronectin).
• Extended culture increased core matrisome proteins and proteoglycans (e.g., versican, decorin), yielding ECM similar to native lung tissue, unlike plastic cultures.

Conclusions:

• Lung scaffolds support ECM regeneration with greater fidelity to native tissue than monolayer cultures.
• This technique offers insights into cell-ECM interactions in health and disease.
• The study highlights the importance of scaffold-based culture for mimicking in vivo tissue environments.