Related Experiment Video
Updated: May 12, 2026

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
Published on: December 3, 2016
The Runx2-SMOC axis in skeletal development: Expanding roles of Smoc1 and Smoc2 in development and disease
Yoshifumi Takahata1, Mitsuki Urushizaki2, Kanta Wakamori2
1Genome Editing Research and Development Unit, Graduate School of Dentistry, The University of Osaka, Osaka, 565-0871, Japan; Department of Molecular and Cellular Biochemistry, Graduate School of Dentistry, The University of Osaka, Osaka, 565-0871, Japan.
Background:
Secreted modular calcium-binding proteins (SMOCs), including SMOC1 and SMOC2, are secreted protein acidic and rich in cysteine family matricellular proteins that regulate cell-matrix interactions and growth factor signaling across development and disease. Recent studies positioned SMOC1 and SMOC2 as direct downstream targets of Runt-related transcription factor 2 (Runx2), the master transcription factor for osteoblast differentiation, and revealed dose-dependent modulation of bone morphogenetic protein 2 (BMP2) signaling by SMOC2.
Highlight:
SMOC1/2 exhibit distinct yet complementary roles in skeletal morphogenesis, extracellular matrix assembly, and mineralization. At lower concentrations, SMOC2 enhances BMP2 signaling, whereas at higher concentrations, it inhibits receptor engagement, explaining context-dependent effects on osteogenesis. Genetic evidence from mouse models and human variants (e.g., SMOC2 Leu359Arg) links disrupted SMOC-ECM interactions to growth-plate defects, delayed ossification, and craniofacial phenotypes. Beyond the skeleton, SMOC proteins participate in angiogenesis, ocular development, kidney and testis biology, and platelet thrombin responses.
Conclusion:
The Runx2-SMOC axis provides a mechanistic bridge between transcriptional programs and matricellular control of BMP2 signaling and ECM dynamics. Clarifying isoform-specific functions and ECM anchoring mechanisms will inform therapeutic strategies for skeletal disorders and broader pathologies in which SMOC proteins are implicated.
More Related Videos
09:16Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
Published on: September 1, 2019
09:20Laser Capture Microdissection of Mouse Embryonic Cartilage and Bone for Gene Expression Analysis
Published on: December 18, 2019
Related Concept Videos
Pleiotropy
Bone Remodeling
Formation of Muscle Fibers from Myoblasts
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
Bone Formation by Intramembranous Ossification
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
Bone Remodeling and Repair
Bone Formation by Endochondral Ossification