image: Concept figure summarizing the proposed regulatory axis connecting extracellular matrix mechanics to integrin signaling and receptor trafficking in joint cells.
Credit: Created with BioRender.com
In a new review, researchers from Soochow University-affiliated orthopedic teams synthesize evidence that mechanical stress, integrin signaling, and integrin endocytosis converge as a coupled regulatory axis in OA. Integrins are cell-surface receptors that connect the extracellular matrix to the cytoskeleton and signaling hubs, enabling joint cells to sense changes in matrix composition, stiffness, and loading.
The review highlights that integrin signaling can amplify catabolic and inflammatory cascades under abnormal load, while integrin endocytosis and recycling can reshape receptor abundance and localization on the membrane. By changing where signals originate and how long they persist, integrin trafficking may help explain why the same integrin pathways can show different effects across disease stages and tissue contexts.
Finally, the authors map translational directions that leverage this “mechanical stress–integrin–endocytosis” nexus, including integrin-related small molecules or natural compounds, RGD-functionalized biomaterials designed to tune cell-matrix adhesion, and strategies to improve mesenchymal stem cell adhesion and retention in the joint. The authors emphasize that future work should validate key trafficking mechanisms in OA-relevant cell types and models, and evaluate tissue specificity, delivery, and long-term safety before clinical translation.