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Cancers 2019, 11(3), 353; https://doi.org/10.3390/cancers11030353

Long-Term Exposure to Oroxylin A Inhibits Metastasis by Suppressing CCL2 in Oral Squamous Cell Carcinoma Cells

1
Master Program of Pharmacology and Toxicology, Department of Medicine, School of Medicine, Tzu Chi University, Hualien 97004, Taiwan
2
Department of Pharmacy, Yuli Hospital, Ministry of Health and Welfare, Hualien 98147, Taiwan
3
Department of Medical Research, Buddhist Tzu Chi General Hospital, Hualien 97004, Taiwan
4
Cardiovascular and Metabolomics Research Center, Buddhist Tzu Chi General Hospital, Hualien 97004, Taiwan
5
Department of Pharmacology, Tzu Chi University, Hualien 97004, Taiwan
*
Author to whom correspondence should be addressed.
Received: 6 February 2019 / Revised: 6 March 2019 / Accepted: 6 March 2019 / Published: 12 March 2019
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Abstract

Oroxylin A (Oro-A), the main bioactive flavonoid extracted from Scutellaria radix, has been reported to inhibit migration in various human cancer cell models. In this study, we further explored the anti-migration effects of Oro-A on oral squamous cell carcinoma (OSCC) cells and investigated the underlying mechanisms. A 24-h (short-term) exposure of OSCC cells to non-cytotoxic concentrations (5–20 μM) of Oro-A significantly suppressed cell migration according to a wound-healing assay. Furthermore, a 30-day exposure (long-term) to Oro-A (20 μM), which did not exhibit a cytotoxic effect on OSCC cells, significantly suppressed cell migration more than short-term Oro-A exposure. To uncover the molecular mechanisms underlying the inhibitory effect of long-term Oro-A exposure on OSCC migration, a cDNA microarray and the Ingenuity software were used. Overall, 112 upregulated and 356 downregulated genes were identified in long-term Oro-A-exposed cells compared with untreated OSCC cells. Among them, 75 genes were reported to be associated with cancer cell migration. Consistent with the cDNA microarray results, we found that the expression levels of several cell migration-related genes, such as LCN2, ID-1, MDK, S100A9 and CCL2, were significantly decreased in long-term Oro-A-exposed OSCC cells using a quantitative real-time polymerase chain reaction (Q-PCR) assay. The Western blotting and enzyme-linked immunosorbent assay (ELISA) results also demonstrated that CCL2 expression at the mRNA and protein levels was significantly decreased in long-term Oro-A-exposed OSCC cells compared with untreated OSCC cells. Moreover, the expression levels of downstream CCL2 targets, including p-ERK1/2, NFκB, MMP2, and MMP9, were also decreased in long-term Oro-A-exposed OSCC cells. Further, Oro-A treatment suppressed in vivo metastasis. These results suggest that long-term Oro-A treatment inhibits metastasis via CCL2 signaling in OSCC cells. View Full-Text
Keywords: oroxylin A; oral squamous cell carcinoma; CCL2; metastasis oroxylin A; oral squamous cell carcinoma; CCL2; metastasis
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Ku, W.-T.; Tung, J.-J.; Lee, T. .-F.; Lai, K.-C. Long-Term Exposure to Oroxylin A Inhibits Metastasis by Suppressing CCL2 in Oral Squamous Cell Carcinoma Cells. Cancers 2019, 11, 353.

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