Diarsenic and tetraarsenic oxide inhibit cell cycle progression and bFGF- and VEGF-induced proliferation of human endothelial cells

✍ Scribed by Sang Hyeok Woo; Myung-Jin Park; Sungkwan An; Hyung-Chahn Lee; Hyeon-Ok Jin; Su-Jae Lee; Ho-Shin Gwak; In-Chul Park; Seok-Il Hong; Chang Hun Rhee

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 341 KB
• Volume: 95
• Category: Article
• ISSN: 0730-2312
• DOI: 10.1002/jcb.20329

✦ Synopsis

Abstract

Arsenic trioxide (As~2~O~3~, diarsenic oxide) has recently been reported to induce apoptosis and inhibit the proliferation of various human cancer cells derived from solid tumors as well as hematopoietic malignancies. In this study, the in vitro effects of As~2~O~3~ and tetraasrsenic oxide (As~4~O~6~) on cell cycle regulation and basic fibroblast growth factor (bFGF)‐ or vascular endothelial growth factor (VEGF)‐stimulated cell proliferation of human umbilical vein endothelial cells (HUVEC) were investigated. Significant dose‐dependent inhibition of cell proliferation was observed when HUVEC were treated with either arsenical compound for 48 h, and flow cytometric analysis revealed that these two arsenical compounds induced cell cycle arrest at the G~1~ and G~2~/M phases—the increases in cell population at the G~1~ and G~2~/M phase were dominantly observed in As~2~O~3~‐ and As~4~O~6~‐treated cells, respectively. In both arsenical compounds‐treated cells, the protein levels of cyclin A and CDC25C were significantly reduced in a dose‐dependent manner, concomitant to the reduced activities of CDK2‐ and CDC2‐associated kinase. In G~1~‐synchronized HUVEC, the arsenical compounds prevented the cell cycle progression from G~1~ to S phase, which was stimulated by bFGF or VEGF, through the inhibition of growth factor‐dependent signaling. These results suggest that arsenical compounds inhibit the proliferation of HUVEC via G~1~ and G~2~/M phase arrest of the cell cycle. In addition, these inhibitory effects on bFGF‐ or VEGF‐stimulated cell proliferation suggest antiangiogenic potential of these arsenical compounds. © 2005 Wiley‐Liss, Inc.