Human mesenchymal stem cells (hMSCs) remodel or regenerate various tissues through several mechanisms. Here, we identified the hMSC-secreted protein SCRG1 and its receptor BST1 as a positive regulator of self-renewal, migration, and osteogenic differentiation. SCRG1 and BST1 gene expression decreased during osteogenic differentiation of hMSCs. Intriguingly, SCRG1 maintained stem cell marker expression (Oct-4 and CD271/LNGFR) and the potentials of self-renewal, migration, and osteogenic differentiation, even at high passage numbers. Thus, the novel SCRG1/BST1 axis determines the fate of hMSCs by regulating their kinetic and differentiation potentials. Our findings provide a new perspective on methods for ex vivo expansion of hMSCs that maintain native stem cell potentials for bone-forming cell therapy.
LY 294002, LY294002, CAS 154447-36-6, is a cell-permeable, potent, reversible, and specific inhibitor of PI 3-kinase ((IC50 = 1.4 µM). Acts on the ATP-binding site.
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U0126, U0126, CAS 109511-58-2, is a potent and specific inhibitor of MEK1 (IC50 = 72 nM) and MEK2 (IC50 = 58 nM). The inhibition is noncompetitive with respect to both ATP and ERK.
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JNK Inhibitor II, JNK Inhibitor II. SP600125, CAS 129-56-6, is a potent, cell-permeable, selective, and ATP competitive inhibitor of c-Jun N-terminal kinase (JNK; IC50 = 40 nM for JNK-1 & JNK-2 & 90 nM for JNK-3).
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Focal Adhesion Kinase Inhibitor I, The Focal Adhesion Kinase Inhibitor I, also referenced under CAS 4506-66-5, controls the biological activity of Foca Adhesion Kinase. This small molecule/inhibitor is primarily used for Phosphorylation & Dephosphorylation applications.
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