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Novel Far-Red Fluorescent 1,4-Dihydropyridines for L-Type Calcium Channel Imaging
Carlotta Borgarelli1, Yvonne E Klingl2,3, Abril Escamilla-Ayala4,5
1Sustainable Chemistry for Metals and Molecules (SCM2), Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Box 2404, 3001 Leuven, Belgium.
Journal of Medicinal Chemistry
|October 10, 2024
Summary
Researchers developed new fluorescent probes, FluoDiPines, to image L-type calcium channels (LTCCs). FluoDiPine 6 enables fast, specific live-cell imaging of LTCCs, crucial for studying related disorders.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- L-type calcium channels (LTCCs) play critical roles in cardiovascular and neurological functions.
- Dysregulation of LTCCs is associated with various diseases, necessitating advanced imaging tools.
- Current methods for LTCC imaging are often limited by speed and specificity.
Purpose of the Study:
- To develop novel small-molecule fluorescent ligands targeting LTCCs.
- To establish fast and specific imaging protocols for LTCCs in live cells.
- To provide a new tool for studying LTCCs in physiological and pathological conditions.
Main Methods:
- Synthesis of a library of far-red fluorescent ligands (FluoDiPines).
- Evaluation using whole-cell patch-clamp electrophysiology.
- Assessment via live-cell calcium (Ca2+) imaging.
- Optimization of labeling protocols for speed and concentration.
Main Results:
- Identified a library of far-red fluorescent ligands targeting LTCCs.
- FluoDiPine 6 emerged as the optimal probe for live-cell fluorescence imaging.
- Demonstrated successful imaging of LTCCs in fixed and live cells using FluoDiPine 6.
- Achieved high specificity with low FluoDiPine 6 concentration (50 nM) and a rapid 5-minute labeling protocol.
Conclusions:
- FluoDiPines represent a novel class of fluorescent probes for LTCCs.
- FluoDiPine 6 is a highly effective tool for rapid and specific live-cell imaging of LTCCs.
- This advancement facilitates the study of LTCCs in various biological contexts and disease models.
