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Tylophorine analogs exhibit a broad range of pharmacological activities, including anti-cancer, anti-inflammatory, anti-autoimmune, and anti-virus effects. Structure-activity relationship study of different structure tylophorine analogs can provide further understanding of their biological activity. Modifications on the  E  ring of the quinolizidine moiety of cryptopleurine analogs changed the potency and the selective inhibitory effect on NF-κB, AP-1, and CRE signaling pathways. Functional cryptopleurine analogs showed potent inhibition of NF-κB signaling pathway in both HepG2 and HEK-293 cell lines. The  E  ring structure analogs also differed in suppression of protein translation, and expression of cyclin D1. Our results showed that DCB-3503 or Rac-cryptopleurine could be a scaffold for modification to yield compounds with different mechanisms of action.

Cryptopleurine Analogs with Modification of E Ring Exhibit Different Mechanism to Rac-Cryptopleurine and Tylophorine