Smoothened (SMO) is a GPCR-like receptor which, with Patched, mediates hedgehog signaling to regulate gene expression through the Gli transcription factors. 20(S)-hydroxy Cholesterol (20(S)-OHC) is an oxysterol which binds SMO and activates hedgehog signaling (EC50 = 3 μM), and this activation is selective for the nat-20(S)-OHC enantiomer. Nat-20(S)-OHC synergizes with the SMO agonist SAG, suggesting an allosteric effect. Nat-20(S)-yne is a form of nat-20(S)-OHC with a terminal alkyne group, which can be used in linking reactions known as click chemistry. Click chemistry involves highly dependable and specific azide-alkyne bioconjugation reactions and can be used to capture or immobilize bioactive molecules. Thus, nat-20(S)-yne has been conjugated with magnetic beads to demonstrate that nat-20(S)-OHC directly binds SMO.
MRT-83 (hydrochloride) is a potent antagonist of the Smoothened (Smo) receptor, effectively inhibiting the Hedgehog (Hh) signaling pathway and BODIPY-cyclopamine binding to human Smo. With its potential applications in the study of cancer disease, MRT-83 (hydrochloride) demonstrates promising prospects for research purposes.
MRT-92 is a potent and selective Smoothened (Smo) receptor inhibitor. MRT-92 displays subnanomolar antagonist activity against Smo in various Hh cell-based assays. MRT-92 inhibits rodent cerebellar granule cell proliferation induced by Hh pathway activation through pharmacologic (half maximal inhibitory concentration [IC50] = 0.4 nM) or genetic manipulation. Smo is the target of anticancer drugs that bind to a long and narrow cavity in the 7-transmembrane (7TM) domain.
LEQ506, also known as NPV-LEQ506, is an orally bioavailable small-molecule Smoothened (Smo) antagonist with potential antineoplastic activity. Smoothened antagonist LEQ506 selectively binds to the Hedgehog (Hh)-ligand cell surface receptor Smo, which may result in the suppression of the Hh signaling pathway, thereby inhibiting tumor cell growth.
(Rac)-SAG, an isoform of SAG, is a potent Smoothened (Smo) receptor agonist (EC₅₀ = 3 nM; Kd = 59 nM) that activates the Hedgehog signaling pathway and counteracts Cyclopamine's inhibition of Smo [1] [2] [3].