Notch Signaling Drives Synovial Fibroblast Identity and Arthritis Pathology

Scientists identified a critical role for NOTCH3 signaling in the differentiation of perivascular and sublining fibroblasts that expressed CD90. Using single-cell RNA sequencing and synovial tissue organoids, they found that NOTCH3 signaling drove both transcriptional and spatial gradients—emanating from vascular endothelial cells outwards—in fibroblasts.