Rodrigues Cunha, Micael; Bhardwaj, Rajesh; Carrel, Aline Lucie; Lindinger, Sonja; Romanin, Christoph; Parise-Filho, Roberto; Hediger, Matthias A.; Reymond, Jean-Louis (2020). Natural product inspired optimization of a selective TRPV6 calcium channel inhibitor. RSC Medicinal Chemistry, 11(9), pp. 1032-1040. Royal Society of Chemistry 10.1039/D0MD00145G
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Transient receptor potential vanilloid 6 (TRPV6) is a calcium channel implicated in multifactorial diseases and overexpressed in numerous cancers. We recently reported the phenyl-cyclohexyl-piperazine cis-22a as the first submicromolar TRPV6 inhibitor. This inhibitor showed a seven-fold selectivity against the closely related calcium channel TRPV5 and no activity on store-operated calcium channels (SOC), but very significant off-target effects and low microsomal stability. Here, we surveyed analogues incorporating structural features of the natural product capsaicin and identified 3OG, a new oxygenated analog with similar potency against TRPV6 (IC50 = 0.082 ± 0.004 μM) and ion channel selectivity, but with high microsomal stability and very low off-target effects. This natural product-inspired inhibitor does not exhibit any non-specific toxicity effects on various cell lines and is proposed as a new tool compound to test pharmacological inhibition of TRPV6 mediated calcium flux in disease models.
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