Abstract
Allantopyrone A is an α-pyrone metabolite that was originally isolated from the endophytic fungus Allantophomopsis lycopodina KS-97. We previously demonstrated that allantopyrone A exhibits anti-cancer, anti-inflammatory, and neuroprotective activities. In the present study, we showed that allantopyrone A up-regulated the protein expression of hypoxia-inducible factor (HIF)-1α in human fibrosarcoma HT-1080 cells. It also up-regulated the mRNA expression of BNIP3 and ENO1, but not other HIF target genes or HIF1A. Allantopyrone A did not inhibit the prolyl hydroxylation of HIF-1α, but enhanced the ubiquitination of cellular proteins. Consistent with this result, chymotrypsin-like and trypsin-like proteasome activities were reduced, but not completely inactivated by allantopyrone A. Allantopyrone A decreased the amount of proteasome catalytic subunits. Therefore, the present results showed that allantopyrone A interfered with the degradation of HIF-1α protein by reducing proteasome activity in human fibrosarcoma HT-1080 cells.
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Acknowledgements
The authors would like to thank Dr. Takehiro Suzuki (RIKEN CSRS) and Dr. Naoshi Dohmae (RIKEN CSRS) for protein identification. This work was partly supported by JSPS KAKENHI Grant number 19H02885 (to T.K.).
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Okuda, C., Ueda, Y., Muroi, M. et al. Allantopyrone A interferes with the degradation of hypoxia-inducible factor 1α protein by reducing proteasome activity in human fibrosarcoma HT-1080 cells. J Antibiot 76, 324–334 (2023). https://doi.org/10.1038/s41429-023-00610-5
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DOI: https://doi.org/10.1038/s41429-023-00610-5