Fibroblasts produce and organize elements of the extracellular matrix (ECM), and also degrade structural elements of the ECM; they secrete a complex mixture of growth factors, cytokines, chemokines; they communicate with neural cells, with cells of hematopoietic origin (dendritic cells, macrophages, T-lymphocytes), with SMC, endothelial and epithelial cells; importantly, this communication is reciprocal (5). (Adapted from: Sorrell et al., “Fibroblasts: a diverse population at the center of it all.”).