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Synthesis of Myrtucommulone D: A Selective Inhibitor of Tyrosyl-DNA Phosphodiesterase 2 Promoting Drug Resistance Reversal in Lung Cancer Cells

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Abstract

Chemoresistance has emerged as a critical barrier in the treatment of lung cancer. The recently discovered DNA repair enzyme, tyrosyl-DNA phosphodiesterase 2, can repair topoisomerase 2-mediated DNA damage, thereby contributing to cancer cell resistance. This study reported the identification of the natural product myrtucommulone D as a selective tyrosyl-DNA phosphodiesterase 2 inhibitor and presented its first enantioselective total synthesis. The enantiomeric excess (ee) of (+)- and (‒)-myrtucommulone D was determined to be 95.3 and 95.1%, respectively. Biological experiments indicated that (+)-myrtucommulone D inhibited tyrosyl-DNA phosphodiesterase 2 with an IC50 value of 0.69 µM and exhibited significant synergistic effects with the anti-cancer drug etoposide in various human lung cancer cell lines, including non-small cell lung cancer cell line (A549), large cell lung cancer cell line (NCI-H460), small cell lung cancer cell line (NCI-H446), and etoposide resistant small cell lung cancer cell line (NCI-H446/VP). Further investigation revealed that the combination of (+)-myrtucommulone D and etoposide could induce drug-resistant cancer cell (NCI-H446/VP) apoptosis, inhibit colony formation, and potentially suppress cancer cell metastasis. The present study delineates the enantioselective total synthesis of myrtucommulone D and its role in combatting anti-tumor drug resistance as a tyrosyl-DNA phosphodiesterase 2 inhibitor.

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The data that support the findings of this study are available on request from the corresponding author.

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Literature search and data collection were performed by YZ. The first draft of the manuscript was written by YZ. LGX, XP, and HY commented on previous versions of the manuscript. YZ and ZW supervised the work and conceptualized the study. All authors read and approved the final manuscript.

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Correspondence to Zhen Wang.

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Zhang, Y., Xiao, LG., Peng, X. et al. Synthesis of Myrtucommulone D: A Selective Inhibitor of Tyrosyl-DNA Phosphodiesterase 2 Promoting Drug Resistance Reversal in Lung Cancer Cells. Rev. Bras. Farmacogn. 34, 595–608 (2024). https://doi.org/10.1007/s43450-023-00509-0

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  • DOI: https://doi.org/10.1007/s43450-023-00509-0

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