Small-Molecule Fluorescent Ligands for the CXCR4 Chemokine Receptor
Sebastian Dekkers1, Birgit Caspar2,3, Joëlle Goulding2,3
1Biodiscovery Institute, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, U.K.
Abstract:
The C-X-C chemokine receptor type 4, or CXCR4, is a chemokine receptor found to promote cancer progression and metastasis of various cancer cell types. To investigate the pharmacology of this receptor, and to further elucidate its role in cancer, novel chemical tools are a necessity. In the present study, using classic medicinal chemistry approaches, small-molecule-based fluorescent probes were designed and synthesized based on previously reported small-molecule antagonists. Here, we report the development of three distinct chemical classes of fluorescent probes that show specific binding to the CXCR4 receptor in a novel fluorescence-based NanoBRET binding assay (pKD ranging 6.6-7.1). Due to their retained affinity at CXCR4, we furthermore report their use in competition binding experiments and confocal microscopy to investigate the pharmacology and cellular distribution of this receptor.
Insights
Researchers developed novel fluorescent probes targeting the C-X-C chemokine receptor type 4 (CXCR4) to study its role in cancer. These probes enable detailed investigation of CXCR4 pharmacology and cellular distribution.
Area of Science:
- Medicinal Chemistry
- Chemical Biology
- Molecular Pharmacology
Background:
- C-X-C chemokine receptor type 4 (CXCR4) is implicated in cancer progression and metastasis.
- Novel chemical tools are essential for understanding CXCR4's role in cancer.
Purpose of the Study:
- To design and synthesize small-molecule fluorescent probes for CXCR4.
- To investigate the pharmacology and cellular distribution of CXCR4 using these novel probes.
Main Methods:
- Medicinal chemistry approaches for probe design and synthesis.
- Fluorescence-based NanoBRET binding assay for affinity determination.
- Competition binding experiments and confocal microscopy for cellular studies.
Main Results:
- Development of three distinct chemical classes of CXCR4-specific fluorescent probes.
- Probes exhibited specific binding to CXCR4 with pKD values ranging from 6.6 to 7.1.
- Probes were successfully used to investigate receptor pharmacology and cellular localization.
Conclusions:
- Novel fluorescent probes provide valuable tools for studying CXCR4.
- These probes facilitate research into CXCR4's function in cancer biology.
- The developed probes advance the understanding of CXCR4-mediated processes.
