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Updated: May 25, 2025
Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
Published on: February 9, 2021
Fluorescent p53 helix mimetics pairing anticancer and bioimaging properties
Sintu Karmakar1, Mimasha Mallik2,3, Sushree Sulava2,3
1School of Chemical Sciences, Central University of Gujarat, Gandhinagar, 382030-India. panchami.p@cug.ac.in.
Abstract:
Fluorescent therapeutic molecules offer a unique platform to study cellular uptake and biological pathways of drug candidates. Inhibition of the p53-HDM2 protein complex with the reactivation of the p53 pathway leading to apoptosis is a promising way to overcome the barriers and challenges in cancer therapeutic design. Although p53 helix mimetics based on the 'hotspots' design using either helical or non-helical backbones are known, cell-permeable and biocompatible inherently fluorescent helix mimetics have not yet been described. We report theragnostic helix mimetics featuring both therapeutic and bioimaging properties in a cancer cell model for the first time. The solvatochromic phthalimide unit in the scaffold functions as a site to append the hotspot mimicking residues, helps in the intramolecular hydrogen bonding mediated pre-organization of side chains on one face, and importantly, exhibits intrinsic fluorescence. The design of the mimetics, synthesis, conformational studies, and molecular docking results are discussed. In vitro cytotoxicity studies were carried out on four cell lines: U87MG (human glioblastoma), A549 (human non-small cell lung cancer), MDA-MB-231 (human triple-negative breast cancer) and HEK293 (non-cancerous cell line). The molecules showed anticancer activity in the micromolar range. The fluorescence properties provided valuable insights into their cellular permeability, distribution, and selectivity towards cancer cells and can shed light on their mechanisms of action.
Insights
Researchers developed novel fluorescent helix mimetics for cancer therapy. These theragnostic molecules inhibit p53-HDM2 interactions, showing anticancer activity and enabling bioimaging of cellular pathways.
Area of Science:
- Medicinal Chemistry
- Chemical Biology
- Cancer Therapeutics
Background:
- Targeting the p53-HDM2 protein complex is a key strategy for cancer therapy, aiming to restore p53-mediated apoptosis.
- Existing p53 helix mimetics lack inherent fluorescence and demonstrated cell permeability for combined therapeutic and imaging applications.
- Developing intrinsically fluorescent and biocompatible molecules is crucial for theranostic applications in cancer research.
Purpose of the Study:
- To design and synthesize novel, inherently fluorescent, and cell-permeable helix mimetics for theranostic cancer applications.
- To evaluate the therapeutic potential and bioimaging capabilities of these novel molecules in cancer models.
- To investigate the cellular uptake, distribution, and mechanism of action of these fluorescent helix mimetics.
Main Methods:
- Synthesis of novel phthalimide-based helix mimetics incorporating p53 'hotspot' mimicking residues.
- Conformational analysis and molecular docking studies to predict molecular interactions.
- In vitro cytotoxicity assays against human cancer cell lines (U87MG, A549, MDA-MB-231) and a non-cancerous cell line (HEK293).
- Fluorescence microscopy to assess cellular uptake, distribution, and localization.
Main Results:
- Successfully synthesized intrinsically fluorescent helix mimetics with a solvatochromic phthalimide core.
- Demonstrated anticancer activity in the micromolar range across tested cancer cell lines.
- Utilized fluorescence properties to visualize cellular permeability, distribution, and selectivity towards cancer cells.
Conclusions:
- The developed theranostic helix mimetics offer a dual approach for cancer treatment and real-time bioimaging.
- These molecules show promise as a new class of anticancer agents with built-in imaging capabilities.
- The fluorescence provides critical insights into the pharmacokinetics and pharmacodynamics of these novel therapeutic candidates.
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