3-Hydroxyflavone inhibits endogenous Aurora B and induces growth inhibition of cancer cell line.
The Aurora kinases play a critical role in mitosis and have been suggested as promising targets for cancer therapy due to their frequent overexpression in a variety of tumors. Compared with established inhibitors of cell division such as the anti-tubulins, novel agents target mitotic enzymes and show similar efficacy but with fewer side effects. Several small-molecule inhibitors of Aurora kinases have been developed as anticancer agents, some of which have progressed to early clinical evaluation. Here we identified 3-hydroxyflavone as a novel Aurora B inhibitor through high throughput screening. 3-Hydroxyflavone showed potent inhibition to Aurora B with the IC(50) on a nanomolar basis in the enzyme-based kinase activity assay. In the cell-based western blotting analysis, 3-hydroxyflavone dramatically decreased the phosphorylation level of Histone H3 on the site of serine 10, demonstrating the potent endogenous Aurora B activity inhibition in cell level. The followed cell image analysis provided the consist result. To make it clear whether 3-hydroxyflavone inhibited Aurora B by direct binding or not, SPR analysis was carried out to measure the affinity of interaction between Aurora B protein and 3-hydroxyflavone and the result proved the binding with high affinity. Usually Aurora activity suppression induced cancer cell proliferation inhibition. Colony formation and cell viability with/without treatment of 3-hydroxyflavone were measured using CCK-8. The growth suppression under 3-hydroxyflavone present and the growth recovery after being released gave strong evidence that presence of 3-hydroxyflavone efficiently inhibited the fast growth of cancer cells.
Lang
Qingyu
Q
State Key Laboratory of Genetic Engineering, School of Life Science, Fudan University, Shanghai, People's Republic of China.
Zhang
Haoxing
H
Li
Jie
J
Xie
Fang
F
Zhang
Yifeng
Y
Wan
Bo
B
Yu
Long
L
D000970:Antineoplastic Agents / Q000494:pharmacology*; D064107:Aurora Kinase B; D064127:Aurora Kinases; D015153:Blotting, Western; D049109:Cell Proliferation / Q000187:drug effects; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology*; D006367:HeLa Cells; D006657:Histones / Q000378:metabolism; D006801:Humans; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D010766:Phosphorylation / Q000187:drug effects; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D020349:Surface Plasmon Resonance; D014410:Tumor Stem Cell Assay
D000970:Antineoplastic Agents; D005419:Flavonoids; D006657:Histones; C576921:AURKB protein, human; D064107:Aurora Kinase B; D064127:Aurora Kinases; D017346:Protein Serine-Threonine Kinases; C041477:3-hydroxyflavone