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Verdinexor (KPT-335) is a potent and selective inhibitor of nuclear export [1].

Nuclear export (SINE) is mainly mediated by exportin 1 (XPO1) and mediates specific proteins out of the nucleus, which plays an important role in the regulation of proliferation and the cell cycle [2].

Verdinexor (KPT-335) is a potent and selective SINE inhibitor that acts as an antiviral drug. In A549 cells inoculated with the influenza A and B virus, verdinexor effectively inhibited the replication of the influenza A and B virus strains tested. verdinexor (1 µM) caused the accumulation of vRNPs in the nuclei and altered the localization of viral NS1. Also, verdinexor increased nuclear negative-sense vRNA by 56.6-fold and significantly reduced cytoplasmic negative-sense vRNA, which suggested that verdinexor blocked vRNP nuclear export. In 293T cells, verdinexor inhibited XPO1-NEP binding [1].

In mice infected with influenza virus A, verdinexor significantly reduced lung influenza virus A titers. Verdinexor also reduced the expression of proinflammatory cytokines tumor necrosis factor alpha, interleukin-6, interleukin-1β and gamma interferon. In mice infected with a lethal dose, verdinexor inhibited virus penetration of the respiratory tract and virus spread in the lungs [1]. In companion dogs with B- and T-cell lymphomas, verdinexor showed potent cytotoxic activity [2].

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