Carnosol-Induced ROS Inhibits Cell Viability of Human Osteosarcoma by Apoptosis and Autophagy

• Published in: The American journal of Chinese medicine (1979) Vol. 45; no. 8; p. 1761
• Main Authors: Lo, Yu-Cheng, Lin, Yung-Chi, Huang, Yi-Fu, Hsieh, Chen-Pu, Wu, Chia-Chieh, Chang, Ing-Lin, Chen, Chiu-Liang, Cheng, Chun-Hsiang, Chen, Hsin-Yao
• Format: Journal Article
• Language: English
• Published: Singapore 2017
• Subjects: Anti-Inflammatory Agents; Antineoplastic Agents, Phytogenic; Antioxidants; Apoptosis - drug effects; Autophagy - drug effects; Cell Survival - drug effects; Diterpenes, Abietane - isolation & purification; Diterpenes, Abietane - pharmacology; Dose-Response Relationship, Drug; Humans; Osteosarcoma - pathology; Reactive Oxygen Species - metabolism; Reactive Oxygen Species - pharmacology; Rosmarinus - chemistry; Tumor Cells, Cultured; Osteosarcoma; Autophagy; Carnosol; ROS; Apoptosis
• ISSN: 0192-415X
• DOI: 10.1142/S0192415X17500951

Carnosol is an anti-oxidant and anti-inflammatory compound from rosemary. In this paper, we investigated antitumor activity of carnosol against human osteosarcoma cells. We found the viability of human osteosarcoma MG-63 cells was significantly decreased in the presence of carnosol (cell viabilities: 17.2% for 20[Formula: see text]μg/ml of CS vs. 100% for control, [Formula: see text]). Carnosol induced apoptosis and cell cycle arrest in a dose-dependent manner in MG-63 cells. Furthermore, carnosol exposure increased the levels of reactive oxygen species (ROS). The pre-treatment of NAC, the ROS scavenger, blocked the inhibition of cell viability in the carnosol treatment, indicating that ROS is important in the antiproliferation effect. Moreover, we demonstrated that carnosol significantly induced autophagy and co-administration of autophagy inhibitor reduced the antiproliferating effect of carnosol. This result exhibited the cytotoxic effect of autophagy induced by carnosol in MG-63 cells. Interestingly, the treatment of NAC decreased carnosol-induced autophagy. Collectively, these data indicate that carnosol suppresses the viability of human osteosarcoma MG-63 cells by upregulation of apoptosis and autophagy, which are both mediated by ROS. Thus, carnosol might serve as a potential therapeutic agent against osteosarcoma.