Cinnamomum verum has been used as a Chinese herbal medication. We investigated the antiproliferative effect of 2-methoxycinnamaldehyde (2-MCA), a constituent of the cortex of the plant, and the molecular biomarkers associated with tumorigenesis in human lung squamous cell carcinoma NCI-H520 cells. The effects of 2-MCA on cell growth, cytotoxicity, apoptosis, and topoisomerase I and II activities in human lung squamous cell carcinoma NCI-H520 cells were evaluated in vitro and in vivo. The results showed that 2-MCA inhibited proliferation and induced apoptosis as implicated by mitochondrial membrane potential ([DELTA][PSI]m) loss, activation of both caspase 3 and caspase 9, as well as morphological characteristics of apoptosis. Furthermore, 2-MCA also induced lysosomal vacuolation with elevated volume of acidic compartment and cytotoxicity, and inhibited topoisomerase I as well as II activities. Additional study showed the antiproliferative effect of 2-MCA in a nude mice model. In short, our data imply that the antiproliferative activity of 2-MCA in vitro involved downregulation of cell growth markers, both topoisomerase I and II, and upregulation of proapoptotic molecules, associated with increased lysosomal vacuolation. In vivo, 2-MCA reduced the tumor size, which could have had a significant clinical impact. Our data imply that 2-MCA may be a potential agent for chemoprevention as well as anticancer therapy. Copyright (C) 2016 Wolters Kluwer Health, Inc. All rights reserved.
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