Flavone acetic acid induces a G2/M cell cycle arrest in mammary carcinoma cells

• Published in: British Journal of Cancer Vol. 80; no. 12; pp. 1905 - 1911
• Main Authors: PANARO, N. J, POPESCU, N. C, HARRIS, S. R, THORGEIRSSON, U. P
• Format: Journal Article
• Language: English
• Published: Basingstoke Nature Publishing Group 01.08.1999
• Subjects: Animals; Antineoplastic agents; Antineoplastic Agents - toxicity; Biological and medical sciences; CDC2 Protein Kinase - metabolism; Cell Cycle - drug effects; Cycloserine - pharmacology; Female; Flavonoids - antagonists & inhibitors; Flavonoids - toxicity; Flow Cytometry - methods; G2 Phase - drug effects; General aspects; Mammary Neoplasms, Experimental; Medical sciences; Metaphase - drug effects; Mitosis - drug effects; Mitotic Index - drug effects; Pharmacology. Drug treatments; Rats; Regular; RNA, Neoplasm - analysis; Tumor Cells, Cultured; Antineoplastic agent; Carcinoma; Flavones; Rat; Enzyme; Mitosis; Transferases; Rodentia; Cyclin; Malignant tumor; Flavonoid; In vitro; Mammary gland diseases; Vertebrata; Mammalia; Shutdown; Protein kinase; Animal; Cell cycle; Established cell line; G2 Phase; Mammary gland; Acetic acid; Mechanism of action
• ISSN: 0007-0920; 1476-5381; 1532-1827
• DOI: 10.1038/sj.bjc.6690619

Flavone acetic acid (FAA) is a synthetic flavonoid that demonstrated extraordinary anti-tumour properties in murine models but was not effective in clinical trials. In an effort to better understand the molecular mechanisms by which FAA asserts its tumouricidal activities, we have examined the effect of FAA on the cell cycle. We observed FAA-mediated G2/M cell cycle arrest in mammary carcinoma cells at a concentration previously demonstrated to have anti-tumour effects in rodent models. The cell cycle arrest was accompanied by an increase in the P34cdc2 (cdc2) cyclin-dependent kinase activity. Morphological cytogenetic analysis demonstrated a colcemid-like effect of FAA on cytokinesis by causing accumulation of condensed C-metaphases of a sustained mitotic block. The cell cycle effect was blocked by the antioxidants ADPC and ascorbate, the superoxide scavenger Tiron, and the sphingosine kinase inhibitor L-cycloserine, but not by inhibitors of nitric oxide synthase. Based on these data, we propose that FAA may induce cell cycle arrest by stimulating the activity of acidic sphingomyelinase leading to the generation of reactive oxygen species.