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Linciano P, Pinzi L, Belluti S, Chianese U, Benedetti R, Moi D, Altucci L, Franchini S, Imbriano C, Sorbi C, Rastelli G. Inhibitors of histone deacetylase 6 based on a novel 3-hydroxy-isoxazole zinc binding group. J Enzyme Inhib Med Chem 2021; 36:2080-2086. [PMID: 34583596 PMCID: PMC8480759 DOI: 10.1080/14756366.2021.1981306] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Histone deacetylase 6 (HDAC6) is an established drug target for cancer treatment. Inhibitors of HDAC6 based on a hydroxamic acid zinc binding group (ZBG) are often associated with undesirable side effects. Herein, we describe the identification of HDAC6 inhibitors based on a completely new 3-hydroxy-isoxazole ZBG. A series of derivatives decorated with different aromatic or heteroaromatic linkers, and various cap groups were synthesised and biologically tested. In vitro tests demonstrated that some compounds are able to inhibit HDAC6 with good potency, the best candidate reaching an IC50 of 700 nM. Such good potency obtained with a completely new ZBG make these compounds particularly attractive. The effect of the most active inhibitors on the acetylation levels of histone H3 and α- tubulin and their anti-proliferative activity of DU145 cells were also investigated. Docking studies were performed to evaluate the binding mode of these new derivatives and discuss structure-activity relationships.
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Affiliation(s)
- Pasquale Linciano
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Luca Pinzi
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Silvia Belluti
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Ugo Chianese
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Rosaria Benedetti
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Davide Moi
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Lucia Altucci
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.,Biogem Institute of Molecular and Genetic Biology, Ariano Irpino, Italy
| | - Silvia Franchini
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Carol Imbriano
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Claudia Sorbi
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Giulio Rastelli
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
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