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Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
Published on: February 9, 2021
Structure-Activity Relationships in Salinomycin: Cytotoxicity and Phenotype Selectivity of Semi-synthetic Derivatives
Björn Borgström1, Xiaoli Huang2, Cecilia Hegardt3
1Centre for Analysis and Synthesis, Lund University, Box 124, 22100, Lund, Sweden.
Abstract:
The ionophore salinomycin has attracted attention for its exceptional ability to selectively reduce the proportion of cells with stem-like properties in cancer cell populations of varying origin. Targeting the tumorigenicity of such cells is of interest as they are implicated in recurrence, metastasis, and drug resistance. Structural derivatives of salinomycin are thus sought after, both as tools for probing the molecular mechanism(s) underlying the observed phenotype effects, and for improving selectivity and activity against cancer stem cells. Synthetic strategies for modification of each of the directly accessible functional groups of salinomycin are presented and the resulting library of analogues was investigated to establish structure-activity relationships, both with respect to cytotoxicity and phenotype selectivity in breast cancer cells. 20-O-Acylated derivatives stand out by exhibiting both improved selectivity and activity. Mechanistically, the importance of the ionophore properties of salinomycin is highlighted by a significant loss of activity by modifications directly interfering with either of the two primary ion coordinating motifs in salinomycin, the C11 ketone and the C1 carboxylate.
Insights
Salinomycin derivatives were synthesized to target cancer stem cells. Certain 20-O-acylated analogues show enhanced selectivity and activity, highlighting the importance of ionophore properties for cancer therapy.
Area of Science:
- Medicinal Chemistry
- Cancer Biology
- Molecular Pharmacology
Background:
- Cancer stem cells (CSCs) are implicated in tumor recurrence, metastasis, and drug resistance.
- Salinomycin selectively reduces CSC populations, making it a promising therapeutic lead.
- Developing novel salinomycin derivatives is crucial for understanding its mechanism and improving efficacy.
Purpose of the Study:
- To synthesize and evaluate structural derivatives of salinomycin.
- To establish structure-activity relationships for cytotoxicity and CSC phenotype selectivity.
- To probe the role of ionophore properties in salinomycin's anti-CSC effects.
Main Methods:
- Synthesis of salinomycin analogues targeting accessible functional groups.
- Assessment of cytotoxicity against cancer cell lines.
- Evaluation of phenotype selectivity in breast cancer cells.
- Structure-activity relationship (SAR) analysis.
Main Results:
- A library of salinomycin analogues was generated and tested.
- 20-O-acylated derivatives demonstrated improved selectivity and activity against CSCs.
- Modifications disrupting ion coordination (C11 ketone, C1 carboxylate) abolished activity, confirming the role of ionophore function.
Conclusions:
- Novel salinomycin derivatives, particularly 20-O-acylated analogues, offer enhanced anti-CSC potential.
- The ionophore activity of salinomycin is critical for its ability to target CSCs.
- These findings provide a basis for developing more effective CSC-targeting cancer therapies.
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