Tissue stiffness

Tissue stiffness refers to the mechanical resistance of the extracellular matrix (ECM) to deformation and is a critical regulator of cell behavior through mechanotransduction (NCBI, 2020). It is not a single molecular target like a protein or receptor, but rather a physical property resulting from the density and cross-linking of ECM components such as collagen and elastin (Nature Reviews Molecular Cell Biology, 2022). In pathological states like solid tumors and organ fibrosis, increased stiffness promotes disease progression, metastasis, and chemoresistance by activating signaling pathways such as YAP/TAZ and integrin-mediated FAK signaling (Science Translational Medicine, 2021). While 'stiffness' itself cannot be directly bound by small molecule or biologic drugs, it is a major focal point in drug discovery as a phenotypic target. Therapeutic strategies focus on modulating the drivers of stiffness, primarily through the inhibition of cross-linking enzymes like Lysyl Oxidase (LOX) or by targeting upstream fibrogenic cytokines like TGF-beta (PubMed, 2019).

Other names

Matrix stiffnessExtracellular matrix stiffnessBiomechanical stiffnessTissue elasticityElastic modulus

Reduction of tissue mechanical resistance via the inhibition of extracellular matrix cross-linking enzymes (e.g., LOX/LOXL2) or the reduction of collagen deposition.