A K(Ca) 2.2/2.3 Opener Reverses ET-1-Induced NLRP3 Activation in Hypertensive Mice Corpora Cavernosa.

Hypertension-induced erectile dysfunction is associated with endothelial dysfunction in the corpus cavernosum. Membrane depolarization activates the NLRP3 inflammasome, with downregulation of endothelial Ca(2+)-activated K(+) channels type 2.3 (K(Ca) 2.3) and upregulation of endothelin-1 (ET-1) linked to erectile dysfunction. However, underlying mechanisms remain incompletely understood. We hypothesized that activating K(Ca) 2.2/2.3 channels reverses erectile dysfunction and ET-1-induced NLRP3 activation in hypertensive DOCA/salt mice. Hypertension was induced in mice using a DOCA/salt model, with unilaterally nephrectomized mice as controls. We measured blood pressure, intracavernous pressure (ICP), and corpus cavernosum (CC) contractility, and performed immunoblots for K(Ca) 2.3, caspase-1, and interleukin-1β (IL-1β). DOCA/salt mice showed impaired erectile function and increased IL-1β activity and reduced K(Ca) 2.3 expression. Treatment with the endothelin receptor antagonist bosentan or the K(Ca) 2.2/2.3 channel opener NS13001 reversed these dysfunctions and reduced ET-1-induced NLRP3 activation. NS13001 also restored decreased currents in endothelial cells exposed to ET-1. These findings establish that hypertension-induced erectile dysfunction involves an ET-1/membrane depolarization/NLRP3 inflammasome axis in corpus cavernosum endothelial cells, and that targeting endothelial K(Ca) 2.2/2.3 channels represents a promising therapeutic strategy to counteract erectile dysfunction.