Osthole Increases the Sensitivity of Liver Cancer to Sorafenib by Inhibiting Cholesterol Metabolism
Ke Fan1, Hui Huang1, Ying Zhao1,2
1Department of Pharmacology, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu Province, China.
Abstract:
Osthole is a natural product that has an inhibitory effect on liver cancer, but its effect on the sensitivity of liver cancer to sorafenib is poorly understood. Here, we investigated the effect of osthole and possible sensitization mechanisms. Our results showed that the combination of 2.5 μM sorafenib and 10 μM osthole had significantly synergistic inhibitory effects on proliferation, colony formation, and migration of HCCLM3, sorafenib-resistant HCCLM3 (HCCLM3-SR), and SK-Hep-1 cells. After treatment of HCCLM3 cells-inoculated subcutaneous xenotransplanted tumor mice with 100 mg/kg osthole, 70 mg/kg sorafenib or their combination for 24 day, the tumor volume, tumor weight, and tumor weight coefficient were significantly lower in the osthole + sorafenib group than in the sorafenib group. Compared with the control group, the total cholesterol and low density lipoprotein-cholesterol contents in serum and tumor tissue were significantly decreased in the osthole or osthole + sorafenib groups, the sterol regulatory element binding protein (SREBP)-2c, 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR), and low-density lipoprotein receptor (LDLR) protein expressions in tumor tissue were significantly downregulated as well. In conclusion, osthole can increase the sensitivity of liver cancer to sorafenib, and the mechanism is related to the downregulations of SREBP-2c, HMGCR, and LDLR protein expressions and subsequent inhibition of cholesterol metabolism.
Insights
Osthole enhances sorafenib
Area of Science:
- Hepatocellular Carcinoma Research
- Natural Product Pharmacology
- Cancer Drug Sensitization
Background:
- Liver cancer poses a significant health challenge.
- Sorafenib is a standard treatment, but resistance is common.
- Osthole's role in sensitizing liver cancer to sorafenib is unclear.
Purpose of the Study:
- To investigate osthole's effect on liver cancer sensitivity to sorafenib.
- To explore the underlying sensitization mechanisms.
Main Methods:
- In vitro studies using HCCLM3, HCCLM3-SR, and SK-Hep-1 cells.
- In vivo xenograft mouse models treated with osthole and sorafenib.
- Analysis of proliferation, colony formation, migration, tumor growth, and cholesterol metabolism markers.
Main Results:
- Osthole and sorafenib combination showed synergistic inhibition of cancer cell proliferation, colony formation, and migration.
- Combined treatment significantly reduced tumor volume and weight in vivo.
- Osthole decreased cholesterol and LDL-cholesterol levels and downregulated SREBP-2c, HMGCR, and LDLR protein expression.
Conclusions:
- Osthole enhances liver cancer sensitivity to sorafenib.
- The mechanism involves downregulating SREBP-2c, HMGCR, and LDLR, inhibiting cholesterol metabolism.
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