MetaTOC stay on top of your field, easily

Pin1, the Master Orchestrator of Bone Cell Differentiation

, ,

Journal of Cellular Physiology

Published online on

Abstract

Pin1 is an enzyme that specifically recognizes the peptide bond between phosphorylated serine or threonine (pS/pT‐P) and proline. This recognition causes a conformational change of its substrate, which further regulates downstream signaling. Pin1−/− mice show developmental bone defects and reduced mineralization. Pin1 targets RUNX2 (Runt‐Related Transcription Factor 2), SMAD1/5, and β‐catenin in the FGF, BMP, and WNT pathways, respectively. Pin1 has multiple roles in the crosstalk between different anabolic bone signaling pathways. For example, it controls different aspects of osteoblastogenesis and increases the transcriptional activity of Runx2, both directly and indirectly. Pin1 also influences osteoclastogenesis at different stages by targeting PU.1 (Purine‐rich nucleic acid binding protein 1), C‐FOS, and DC‐STAMP. The phenotype of Pin1−/− mice has led to the recent identification of multiple roles of Pin1 in different molecular pathways in bone cells. These roles suggest that Pin1 can be utilized as an efficient drug target in congenital and acquired bone diseases. J. Cell. Physiol. 232: 2339–2347, 2017. © 2016 Wiley Periodicals, Inc. Pin1 is a peptidyl prolyl cis–trans isomerase that isomerizes only phosphorylated Ser/Thr‐Pro motifs. Upon binding, Pin1 mediates structural modifications resulting in dramatic changes in substrate activity. In this review, we have summarized the known roles of Pin1 in molecular regulation of bone cell differentiation. Pin1 binds to Runx2, Smad1/5, and β‐catenin, which act downstream of the FGF, BMP, and Wnt signaling pathways, respectively. Binding of Pin1 increases the stability and transcriptional activity of Runx2 and Smad1/5. Pin1 also inhibits the nuclear export of β‐catenin and increases the level of transcriptionally active nuclear β‐catenin.