Issue 31, 2020

An antibody–supermolecule conjugate for tumor-specific targeting of tumoricidal methylated β-cyclodextrin-threaded polyrotaxanes

Abstract

We previously found that acid-labile polyrotaxane containing methylated β-cyclodextrin (Me-PRX) induces endoplasmic reticulum (ER) stress-related autophagy and autophagic cell death. Me-PRX-induced autophagic cell death occurs even in apoptosis-resistant cells; tumor-targeted Me-PRX delivery could thus be an effective cancer treatment approach. In this study, antibody–supermolecule conjugates, consisting of a tumor-specific antibody and Me-PRX, were designed to achieve a tumor-specific delivery of Me-PRX. Trastuzumab, a monoclonal antibody against HER2 expressed in various malignant tumors, was selected as a tumor-targeting antibody, and phenyl maleimide group-modified Me-PRX (Mal-Me-PRX) was conjugated to the cysteine residue of the reduced Trastuzumab to obtain a Trastuzumab–Me-PRX conjugate (Tras-Me-PRX). The cellular association of Tras-Me-PRX to HER2-expressing tumor cells was remarkably greater than that of unmodified Me-PRX. Moreover, Tras-Me-PRX effectively reduced the viability of HER2-expressing tumor cells at a lower concentration compared to the unmodified Me-PRX. In conclusion, antibody–Me-PRX conjugates are regarded as a new class of antibody–drug conjugates that would contribute to the chemotherapy of cancers.

Graphical abstract: An antibody–supermolecule conjugate for tumor-specific targeting of tumoricidal methylated β-cyclodextrin-threaded polyrotaxanes

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
03 Mac 2020
Accepted
09 Jun 2020
First published
23 Jun 2020

J. Mater. Chem. B, 2020,8, 6975-6987

An antibody–supermolecule conjugate for tumor-specific targeting of tumoricidal methylated β-cyclodextrin-threaded polyrotaxanes

K. Nishida, A. Tamura, T. W. Kang, H. Masuda and N. Yui, J. Mater. Chem. B, 2020, 8, 6975 DOI: 10.1039/D0TB00575D

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