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Dysregulated metabolism, including lipid peroxidation, contributes to the various stages of breast cancer, including initiation and progression. However, 4-HNE mimetic as a new class of drugs of epigenetic enzymes is not explored.
The objective of this study was to explore the relevance of lipid peroxidation products in breast cancer and the design of mimetic 4-HNE as an inhibitor of SIRT2.
The metabolite profiling of 4-HNE was collected from the urine of breast cancer patients and healthy subjects by employing an in-house developed vertical tube gel electrophoresis (VTGE) tool and LC-HRMS. The determination of lipid peroxidation products MDA was estimated by thiobarbituric acid-reactive substance (TBARS) assay. Mimetic 4-HNE (4-HNEM) was designed and evaluated for their inhibitory binding affinity upon a potential target SIRT2 using molecular docking and molecular dynamics (MD) simulations.
Metabolic profiling of 4-HNE indicated detectable levels in the urine of breast cancer patients over non-detectable levels in healthy subjects. Also, the level of TBARS MDA appeared to be reduced in the urine of breast cancer patients over healthy control. Computational tool-assisted molecular docking-based screening data predicted that 4-HNE has a good inhibitory binding affinity (-7.0 kcal/mol) upon SIRT2. Furthermore, the designed mimetic 4-HNEM projected an improved inhibitory binding affinity (-8.7 kcal/mol) against SIRT2. Furthermore, mimetic 4-HNEM exhibited equivalent strong binding affinity and specific interacting amino acid residues (ARG97, PHE119, ALA186, PHE234, PHE235) similar to a known SIRT2 inhibitor 8NO. ADMET profiles of 4-HNEM, including drug-induced liver injury and cytotoxicity, were found to be slightly better than a known SIRT2 inhibitor 8NO.
This study emphasizes the relevance of 4-HNE and MDA as biomarkers in breast cancer. A mimetic 4-HNEM is projected to be a novel small-molecule inhibitor of SIRT2 that could be explored as a potential combinatorial anticancer agent.