LE135

LE135 is a potent RAR antagonist that binds selectively to RARα (K_i of 1.4 μM) and RARβ (K_i of 220 nM), and has a higher affinity to RARβ. LE135 is highly selective over RARγ, RXRα, RXRβ and RXRγ. LE135 is also a potent TRPV1 and TRPA1 receptors activator with EC₅₀s of 2.5?μM and 20?μM, respectively^[1][2]. In Vitro: LE135 inhibits Am80-induced differentiation of human promyelocytic leukemia cells HL-60 with an IC₅₀ of 150 nM^[1].
LE135 inhibits retinoic acid (RA)-induced transcriptional activation of RARβ, but not RARα, RARγ or retinoid X receptor α (RXRα), on a variety of RA response elements. LE135 strongly represses 12-O-tetradecanoylphorbol-13-acetate-induced AP-1 activity in the presence of RARβ and RXRα^[3]. In Vivo: LE135 provokes nociceptive responses and elicited thermal hyperalgesia mainly through TRPV1 channels, but required both TRPA1 and TRPV1 channels for producing mechanical allodynia. Intraplantar injection of LE135 (30?nmol/10?μL) induces mechanical hypersensitivity in wild-type and Trpa1^?/? mice^[2].