Inhibition of Tumor Cells Proliferation and Migration by the Flavonoid Furin Inhibitor Isolated From Oroxylum indicum

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Abstract:

Background: The medicinally active plant Oroxylum indicum (OI) has drawn considerable research interest because of its many observed biological activities. Of particular interest is its antitumorigenic activity. The plant is a rich source of flavonoids and their glycosides. Recently flavonoids have been described as inhibitors of kexin-type proteases of superfamily Proprotein Convertase Subtilisin/ Kexins (PCSKs) which have been implicated in tumor growth and malignancy. These enzymes particularly furin (PCSK3) cleaves inactive precursor growth factors into their mature forms that promote tumor growth. As a result, finding furin-inhibitors became of high interest in cancer research. In this regard, the plant OI with known anticancer activities may provide an important source. Objective: The objective of this study is to examine and compare anti-tumorigenic activity of furin inhibitory flavonoid compounds from OI. Results: Studies were conducted to evaluate the effect on CT-26 cell proliferation and migration of 4 flavonoids baicalein, chrysin, oroxylin-A and its glycoside isolated from OI. Data revealed that baicalein exhibited most potent inhibitory effect on proliferation and migration on the analyzed tumor cell line. Baicalein at 10 μM completely blocked the proliferation even after 5 days. The results are consistent with the observed in vitro anti-furin activity of baicalein as measured against a fluorogenic peptide and pro-hVEGF-C as substrates. Mature VEGF-C is a strong indicator and biomarker of tumor progression and therefore the antifurin activity may explain the observed anticancer properties of baicalein. Since baicalein is the major constituent of OI, our data provided scientific rationale for the observed anticancer activity of OI and also offered a new lead molecule for future exploration as potential antitumor agents.
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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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