3 years ago

Scalaradial Is a Potent Inhibitor of Transient Receptor Potential Melastatin 2 (TRPM2) Ion Channels

Scalaradial Is a Potent Inhibitor of Transient Receptor Potential Melastatin 2 (TRPM2) Ion Channels
Michelle Kelly, Jun-Ichi Goto, George Myers, Sayuri Suzuki, Peter Poerzgen, John G. Starkus, F. David Horgen, Kristine Layugan, Andrea Fleig, Reinhold Penner, Kelly Galbraith Kawabata
TRPM2 is a Ca2+-permeable, nonselective cation channel that plays a role in oxidant-induced cell death, insulin secretion, and cytokine release. Few TRPM2 inhibitors have been reported, which hampers the validation of TRPM2 as a drug target. While screening our in-house marine-derived chemical library, we identified scalaradial and 12-deacetylscalaradial as the active components within an extract of an undescribed species of Cacospongia (class Demospongiae, family Thorectidae) that strongly inhibited TRPM2-mediated Ca2+ influx in TRPM2-overexpressing HEK293 cells. In whole-cell patch-clamp experiments, scalaradial (and similarly 12-deacetylscalaradial) inhibited TRPM2-mediated currents in a concentration- and time-dependent manner (∼20 min to full onset; IC50 210 nM). Scalaradial inhibited TRPM7 with less potency (IC50 760 nM) but failed to inhibit CRAC, TRPM4, and TRPV1 currents in whole-cell patch clamp experiments. Scalaradial’s effect on TRPM2 channels was shown to be independent of its well-known ability to inhibit secreted phospholipase A2 (sPLA2) and its reported effects on extracellular signal-regulated kinases (ERK) and Akt pathways. In addition, scalaradial was shown to inhibit endogenous TRPM2 currents in a rat insulinoma cell line (IC50 330 nM). Based on its potency and emerging specificity profile, scalaradial is an important addition to the small number of known TRPM2 inhibitors.

Publisher URL: http://dx.doi.org/10.1021/acs.jnatprod.7b00515

DOI: 10.1021/acs.jnatprod.7b00515

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