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Chinese Propolis Exerts Anti-Proliferation Effects in Human Melanoma Cells by Targeting NLRP1 Inflammatory Pathway, Inducing Apoptosis, Cell Cycle Arrest, and Autophagy

1
College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
2
Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
*
Author to whom correspondence should be addressed.
Nutrients 2018, 10(9), 1170; https://doi.org/10.3390/nu10091170
Received: 18 July 2018 / Revised: 17 August 2018 / Accepted: 23 August 2018 / Published: 26 August 2018
Melanoma is a malignant tumor that begins in the melanocyte and has the highest mortality rate among all cutaneous tumors. Chinese propolis (CP) has been shown to have a potent antitumor effect against various cancers. In this study, we uncovered the combined effects of antiproliferation and anti-inflammation of CP on suppressing the progression of human melanoma cell line A375. We evaluated the alterations of protein expression after CP treatment by Western blot. After CP treatment, A375 cells underwent intrinsic apoptosis and cell cycle arrest. Furthermore, we found that CP suppressed inflammation in A375 cells. NLRP1 (NLR family pyrin domain containing 1), confirmed as a proinflammatory protein in melanoma progression, was downregulated significantly by CP, as were the NLRP1-related caspase activation and recruitment domains (CARD) proteins, including caspase-1 and caspase-4. Additionally, decreasing mRNA levels of IL-1α, IL-1β, and IL-18 further proved the negative regulation of CP on the melanoma inflammatory environment. We also discovered that CP induced autophagy in A375 cells. Interestingly, inhibiting autophagy in CP-treated cells diminished its antitumor effect, suggesting that the autophagy was attributed to CP-induced apoptosis. Collectively, CP is a promising candidate for drug development for melanoma therapy. View Full-Text
Keywords: Chinese propolis; anti-melanoma activity; apoptosis; anti-inflammatory activity; autophagy induction; cell cycle Chinese propolis; anti-melanoma activity; apoptosis; anti-inflammatory activity; autophagy induction; cell cycle
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Zheng, Y.; Wu, Y.; Chen, X.; Jiang, X.; Wang, K.; Hu, F. Chinese Propolis Exerts Anti-Proliferation Effects in Human Melanoma Cells by Targeting NLRP1 Inflammatory Pathway, Inducing Apoptosis, Cell Cycle Arrest, and Autophagy. Nutrients 2018, 10, 1170.

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