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SC75741 is a potent NF-κB inhibitor with EC50 value of 200 nM.

NF-kB is a protein complex that regulates the expression of immunoreceptors, inflammatory cytokines and chemokines and is commonly regarded as a major antiviral factor. However, it has been shown that influenza A viruses exploit this signaling pathway for efficient replication [1].

In MDCK cells, inhibitory potential of 5 uM SC75741 on virus replication is highest at later stages of infection. In the human alveolar type II epithelial cell line A549 infected with H5N1 and H7N7 viruses, SC75741 provoked an efficient reduction of virus titers in a dose-dependent way [1].

In the lung of infected mice, SC75741 reduces viral replication and H5N1-induced IL6 and IP-10 expression. In addition, SC75741 also reduced cytokine production in vivo that is involved in hypercytokinemia mediated by influenza virus infection. Importantly, SC75741 exhibits a high barrier for virus variants [1].

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