The small molecule gibberellin JRA-003 (1) was identified as an inhibitor of the NF-kB (nuclear kappa-light-chain enhancer of activated B cells) pathway. Here we find that JRA-003 binds to and significantly inhibits the nuclear translocation of pathway-activating kinases IKKalpha (IkB kinase alpha) and IKKbeta (IkB kinase beta). Analogs were synthesized and NF-kB-inhibiting gibberellins were found to be cytotoxic in cancer-derived cell lines (HS 578T, HCC 1599, RC-K8, Sud-HL4, CA 46, and NCIH 4466). Not only was JRA-003 (1) identified as the most potent synthetic gibberellin against cancer-derived cell lines, it displayed no cytotoxicity in cells derived from non-cancerous sources (HEK 293T, HS 578BST, HS 888Lu, HS 895Sk, HUVEC). This selectivity suggests a promising approach for the development of new therapeutics.
David and Lucile Packard Foundation
Alfred P. Sloan Foundation
Camille and Henry Dreyfus Foundation
Koch Institute Cancer Center Support Core Grant (P30-CA14051)
InstitutionUniversity of Michigan
ORCID For Submitting Author0000-0003-4968-8013
Declaration of Conflict of InterestNo conflict of interest