Title:Design, Synthesis and Binding Affinity Evaluation of Cytochrome P450 1B1 Targeted
Chelators
Volume: 22
Issue: 2
Author(s): Dongmei Chen, Qiqi Fan, Ting Xu, Jinyun Dong, Jiahua Cui, Zengtao Wang, Jie Wang, Qingqing Meng*Shaoshun Li*
Affiliation:
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240,China
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240,China
Keywords:
Chelator, cytochrome P450 1B1, imaging agents, α-naphthoflavone derivative, radiopharmaceutical, PET.
Abstract: Background: Cytochrome P450 1B1 (CYP1B1) is specifically expressed in a variety of tumors which
makes it a promising imaging target of tumor.
Objective: We aimed to design and synthesize CYP1B1 targeted chelators for the potential application in
positron emission tomography (PET) imaging of tumor.
Methods: 1,4,7-triazacyclononane-1,4-diiacetic acid (NODA) was connected to the CYP1B1 selective inhibitor
we developed before through polyethylene glycol (PEG) linkers with different lengths. The inhibitory activities
of chelators 6a-c against CYP1 family were evaluated by 7-ethoxyresorufin o-deethylation (EROD) assay. The
manual docking between the chelators and the CYP1B1 was conducted subsequently. To determine the binding
affinities of 6a-c to CYP1B1 in cells, we further performed a competition study at the cellular level.
Results: Among three chelators, 6a with the shortest linker showed the best inhibitory activity against CYP1B1.
In the following molecular simulation study, protein-inhibitor complex of 6a showed the nearest F-heme distance
which is consistent with the results of enzymatic assay. Finally, the cell based competitive assay proved the
binding affinity of 6a-c to CYP1B1 enzyme.
Conclusion: We designed and synthesized a series of chelators which can bind to CYP1B1 enzyme in cancer
cells.To our knowledge, this work is the first attempt to construct CYP1B1 targeted chelators for radiolabeling
and we hope it will prompt the application of CYP1B1 imaging in tumor detection.