Genistein, a naturally occurring isoflavone, possesses many beneficial health effects. To improve the bioactivity of the natural compound, we designed and synthesized the genistein prodrug FEHH6-1. In the present study, we evaluated the biological effects of FEHH6-I on mouse RAW264.7 macrophages and compared them with those obtained with the parent drug genistein. The characteristics of FEHH6-1 were determined by melting point, nuclear magnetic resonance spectroscopy (NMR), and mass spectrometric analysis. The effects of FEHH6-I on cell proliferation, apoptosis, and pro-inflammatory cytokine expression were monitored by XTT-assay, Annexin-V/7-AAD staining, Western blotting, and ELISA. FEHH6-1 showed NMR spectra and relative molecular mass in agreement with the designed structure. In mouse RAW264.7 macrophages, FEHH6-1 inhibited proliferation, induced apoptotic cell death and blocked interleukin 6 and tumor necrosis factor alpha synthesis. At low concentrations, FEHH6-1 induced phosphorylation of AKT1, a kinase involved in cell proliferation and survival. Our data demonstrate that the genistein prodrug FEHH6-1 is a bioactive molecule but its solubility and therefore also its efficacy was significantly lower compared with genistein.
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