Abstract
Carnosic acid is a naturally occurring, plant-derived polyphenolic abietane diterpene with anti-tumor properties. However, its underlying mechanisms are still unclear. Therefore, we investigated the effects of carnosic acid on lung metastasis in a murine melanoma model. C57BL/6 mice were intravenously injected with B16-BL6 cells, followed by carnosic acid treatment. Lung weights were recorded, and tumor cell colonies were counted at the end of the experiment. Integrin expression was evaluated using flow cytometry and cell adhesion assays. Lung weights were significantly lower in the carnosic acid group than in the control group, indicating the suppression of metastasis. Carnosic acid suppressed α4 integrin expression in B16-BL6 cells and inhibited α4 and α9 integrin-dependent cell adhesion. Thus, our data suggest that carnosic acid prevents lung metastasis, possibly by suppressing integrin expression. Our findings support the clinical application of carnosic acid as a potential natural anti-tumor agent, offering a complementary approach to conventional therapies.
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