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Smoothened (SMO) is a cell surface receptor that, with Patched, mediates hedgehog signaling to regulate gene expression through the Gli transcription factors. GSA 10 is a quinolinecarboxamide derivative that acts as an agonist of SMO. By acting at SMO, GSA 10 has been shown to promote the differentiation of multipotent mesenchymal progenitor cells into osteoblasts (EC₅₀ = 1.2 μM). Most notably, GSA 10 does not recognize the classic cyclopamine binding site as do other SMO agonists and as such has been used to characterize a novel SMO active site.

GSA 10 is a novel small-molecule positive modulator of smoothened. GSA 10 may have therapeutic interests in regenerative medicine.

[1] TATIANA GOROJANKINA. Discovery, molecular and pharmacological characterization of GSA-10, a novel small-molecule positive modulator of Smoothened.[J]. Molecular Pharmacology, 2013, 83 5: 1020-1029. DOI: 10.1124/mol.112.084590