Summary
Background Human 3β-hydroxysteroid dehydrogenase type 1 (HSD3B1) is an enzyme associated with steroidogenesis, however its’ role in hepatocellular carcinoma (HCC) biology is unknown. Trilostane is an inhibitor of HSD3B1 and has been tested as a treatment for patients with breast cancer but has not been studied in patients with HCC. Methods and Results The expression of HSD3B1 in HCC tumors in 57 patients were examined. A total of 44 out of 57 tumors (77.2%) showed increased HSD3B1 expression. The increased HSD3B1 in tumors was significantly associated with advanced HCC. In vitro, the knockdown of HSD3B1 expression in Mahlavu HCC cells by a short hairpin RNA (shRNA) led to significant decreases in colony formation and cell migration. The suppression of clonogenicity in the HSD3B1-knockdown HCC cells was reversed by testosterone and 17β-estradiol. Trilostane-mediated inhibition of HSD3B1 in different HCC cells also caused significant inhibition of clonogenicity and cell migration. In subcutaneous HCC Mahlavu xenografts, trilostane (30 or 60 mg/kg, intraperitoneal injection) significantly inhibited tumor growth in a dose-dependent manner. Furthermore, the combination of trilostane and sorafenib significantly enhanced the inhibition of clonogenicity and xenograft growth, surpassing the effects of each drug used alone, with no documented additional toxicity to animals. HSD3B1 blockade was found to suppress the phosphorylation of extracellular signal-regulated kinase (ERK). The decreased ERK phosphorylation was reversed by testosterone or 17b-estradiol. Conclusions Trilostane significantly inhibited the growth of HCC by inhibiting HSD3B1 function and augmenting the efficacy of sorafenib.
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The clinicopathological data of patients were retrieved from the database of MacKay Memorial Hospital under the approval from the Institutional Review Board of MacKay Memorial Hospital (13MMHIS269). HCC tissues were collected from patients who underwent liver resection in the Department of Surgery, MacKay Memorial Hospital under the informed consent.
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Acknowledgement
We thank Miss Yi-Min Liu for performing part of the cell culture experiments. We are grateful to Dr Sheng-Hsiang Li for kindly providing testosterone and estradiol. We also thank the National RNAi Core Facility at Academia Sinica in Taiwan for providing shRNA reagents and related services.
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This work was supported by research grants (MMH-104-89, MMH-106-75, MMH-108-E-10 and MMH-109-E-10) from MacKay Memorial Hospital.
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MJ Chen and JC Lin contributed to the study concept and design. YC Chang initiated the study examining trilostane for the treatment for various cancer types. CL Liu, SP Cheng, WC Huang provided logistical support. CH Lin and CY Wu helped with data collection and analysis. All authors reviewed and approved the final manuscript.
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In this study the use of human samples from the surgically removed specimen was approved by the Institutional Review Board of MacKay Memorial Hospital (13MMHIS269). Informed consent was obtained from all patients in order to obtain tissue samples. All animal experiments were approved by the Institutional Animal Care and Use Committee of MacKay Memorial Hospital (MMH-A-S-103-46).
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Lin, JC., Liu, CL., Chang, YC. et al. Trilostane, a 3β-hydroxysteroid dehydrogenase inhibitor, suppresses growth of hepatocellular carcinoma and enhances anti-cancer effects of sorafenib. Invest New Drugs 39, 1493–1506 (2021). https://doi.org/10.1007/s10637-021-01132-3
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DOI: https://doi.org/10.1007/s10637-021-01132-3