Cancer Research and Treatment

Original Article

A Phage Display-Identified Peptide Selectively Binds to Kidney Injury Molecule-1 (KIM-1) and Detects KIM-1-Overexpressing Tumors in vivo: Md. Enamul Haque, Fatima Khan, Lianhua Chi, Smriti Gurung, Sri Murugan Poongkavithai Vadevoo, Rang-Woon Park, Dong-Kyu Kim, Sang Kyoon Kim, Byungheon Lee; Cancer Res Treat. 2019;51(3):861-875. Published online October 1, 2018; DOI: https://doi.org/10.4143/crt.2018.214

Purpose
This study was carried out to identify a peptide that selectively binds to kidney injury molecule-1 (KIM-1) by screening a phage-displayed peptide library and to use the peptide for the detection of KIM-1overexpressing tumors in vivo.
Materials and Methods
Biopanning of a phage-displayed peptide library was performed on KIM-1–coated plates. The binding of phage clones, peptides, and a peptide multimer to the KIM-1 protein and KIM-1–overexpressing and KIM-1–low expressing cells was examined by enzyme-linked immunosorbent assay, fluorometry, and flow cytometry. A biotin-peptide multimer was generated using NeutrAvidin. In vivo homing of the peptide to KIM-1–overexpressing and KIM1–low expressing tumors in mice was examined by whole-body fluorescence imaging.
Results
A phage clone displaying the CNWMINKEC peptide showed higher binding affinity to KIM-1 and KIM-1–overexpressing 769-P renal tumor cells compared to other phage clones selected after biopanning. The CNWMINKEC peptide and a NeutrAvidin/biotin-CNWMINKEC multimer selectively bound to KIM-1 over albumin and to KIM-1–overexpressing 769-P cells and A549 lung tumor cells compared to KIM-1-low expressing HEK293 normal cells. Co-localization and competition assays using an anti–KIM-1 antibody demonstrated that the binding of the CNWMINKEC peptide to 769-P cells was specifically mediated by KIM-1. The CNWMINKEC peptide was not cytotoxic to cells and was stable for up to 24 hours in the presence of serum. Whole-body fluorescence imaging demonstrated selective homing of the CNWM-INKEC peptide to KIM-1–overexpressing A498 renal tumor compared to KIM1–low expressing HepG2 liver tumor in mice.
Conclusion
The CNWMINKEC peptide is a promising probe for in vivo imaging and detection of KIM-1‒overexpressing tumors.

Citations

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