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An optimized CYP3A4-activatable fluorogenic sensor for in situ functional imaging and multi-dimensional inhibitor
Feng Zhang1, Yufan Fan1, Mei Luo1
1State Key Laboratory of Discovery and Utilization of Functional Components in Traditional Chinese Medicine, Shanghai Frontiers Science Center of TCM Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine Shanghai 201203 China geguangbo@shutcm.edu.cn.
Researchers developed a novel fluorogenic sensor, N-cyclopropylmethyl-1,8-naphthalimide (NCN), for precisely measuring Cytochrome P450 3A4 (CYP3A4) activity. This tool enables in situ imaging and inhibitor assessment in living systems without P-gp interference.
Area of Science:
- Biochemistry
- Pharmacology
- Chemical Biology
Background:
- Cytochrome P450 3A4 (CYP3A4) is a critical drug-metabolizing enzyme.
- Accurate tools are needed to monitor CYP3A4 activity in complex biological systems.
- Understanding CYP3A4 modulation is vital for drug development and patient safety.
Purpose of the Study:
- To develop an optimized CYP3A4-activatable fluorogenic sensor for in situ detection.
- To create a tool that avoids interference from P-glycoprotein (P-gp).
- To enable precise assessment of CYP3A4 inhibitors across various biological systems.
Main Methods:
- Integrated strategy involving computer-aided design, drug-likeness filtering, and biochemical assays.
- Screening of 1,8-naphthalimide derivatives to identify an optimal CYP3A4 substrate.
- Evaluation of the sensor's specificity, sensitivity, cell permeability, bio-safety, and P-gp interaction.
Main Results:
- Identified N-cyclopropylmethyl-1,8-naphthalimide (NCN) as a highly specific and sensitive CYP3A4 fluorogenic substrate.
- NCN and its metabolite HNCN are non-substrates of P-gp, facilitating in situ imaging.
- NCN demonstrated oral bioavailability, enabling multi-dimensional assessment of CYP3A4 inhibitors.
Conclusions:
- NCN is a practical and reliable tool for in situ CYP3A4 activity imaging.
- The developed sensor enables precise assessment of CYP3A4 inhibitors in vitro, ex vivo, and in vivo.
- This work presents a rational engineering strategy for developing isoform-specific, orally bioavailable CYP3A4 substrates.
