Bone Morphogenetic Protein-7 (BMP-7) is an extracellular multifunctional cytokine that is also a member of the TGF-β family. BMP7 can significantly inhibit TGF-β through binding with TGF-β receptor and trigger SMAD transcription factors, such as SMAD 1 /5/8. It plays a vital role in inhibiting the expansion of kidney damage and promoting the differentiation of osteoblasts.