Antiangiogenic effect of licochalcone A

Biochemical Pharmacology
Yoon Hee KimJin-Kyung Kim

Abstract

To date, no antiangiogenic activity has been demonstrated for licochalcone A (LicA), a major phenolic constituent of Glycyrrhiza inflata, although it shows significant antitumor activity in human malignant cell lines. Our previous work demonstrated that LicA down-regulates inflammatory responses to lipopolysaccharide in murine macrophages. The purpose of the present study was to evaluate whether LicA inhibits angiogenesis, which is crucial for cancer development and progression. LicA significantly inhibited proliferation (20 microM), migration (5-20 microM), and tube formation (10-20 microM) of human umbilical vascular endothelial cells (HUVECs) as well as microvessel growth from rat aortic rings (10-20 microM). Furthermore, LicA significantly inhibited the growth of CT-26 colon cancer implants in BALB/c mice, with fewer CD31- and Ki-67-positive cells but more apoptotic cells. The underlying antiangiogenic mechanism of LicA correlated with down-regulation of vascular endothelial growth factor receptor (VEGFR)-2 activation. Our findings provide the first evidence that LicA inhibits angiogenesis in vitro and in vivo, perhaps by blocking VEGF/VEGFR-2 signaling. Inhibition of tumor growth may be attributed, at least in part, to dec...Continue Reading

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