Joint-scale transport considerations for translating 15-hydroxy prostaglandin dehydrogenase inhibition to cartilage regeneration

Singla et al. [1] recently reported in Science that pharmacologic inhibition of 15-hydroxyprostaglandin dehydrogenase (15-PGDH) promotes cartilage repair in a murine osteoarthritis model, identifying a promising regenerative strategy in a tissue with limited intrinsic healing capacity. As this mechanism moves toward clinical translation, it may be useful to consider how joint-scale transport processes influence whether candidate molecules reach chondrocytes at therapeutically relevant concentrations in human cartilage.