Non-Hypertrophic Chondrogenesis of Mesenchymal Stem Cells through Mechano-Hypoxia Programming

This study developed a mechano-hypoxia conditioning strategy to induce stable, non-hypertrophic chondrogenesis of human bone marrow–derived mesenchymal stem cells embedded in a hyaluronan-based hydrogel. By combining hypoxic culture with TGF-β3 withdrawal and physiologically relevant mechanical loading—dynamic compression and cyclic hydrostatic pressure—the authors achieved robust upregulation of cartilage-specific matrix genes while suppressing hypertrophic and osteogenic markers. Transcriptomic, biochemical, and histological analyses confirmed enhanced cartilage-like extracellular matrix deposition. Mechanical testing demonstrated increased peak and equilibrium moduli following dynamic compression, indicating functional maturation of engineered cartilage constructs without progression toward hypertrophy.