Schematic representation of the TGF-β superfamily signaling pathways and cellular regulation during the wound healing process. TGF-β Superfamily proteins transforming growth factor beta (TGF-β), growth differentiation factors (GDFs), activin, and bone morphogenetic proteins (BMPs) bind to Type I, II, and III receptor complexes. This leads to activation of intracellular R-Smad, Co-Smad, and I-Smad signaling cascades. These interactions regulate hematopoietic stem cells (HSCs), mesenchymal stem cells (MSCs), and endothelial progenitor cells (EPCs) from the stem cell niche. They also regulate monocytes, fibroblasts, endothelial cells (ECs), keratinocytes, and epithelial mesenchymal transitions (EMT) during wound healing.