Core-Shell Chitosan Particles Targeting Membrane-Bound Heat Shock Protein 70 for Cancer Therapy.

Anti-cancer targeted therapy is a promising approach. However, the identification of target molecules over-expressed in a wide range of tumors remains a significant challenge. The aim of this study was to analyze the expression of cell membrane-exposed heat shock protein 70 kDa (mHSP70) on different tumor cells and to develop a nanoscale delivery system based on a monoclonal antibody (mAb) that recognizes mHSP70 and uses chitosan core-shell nanoparticles (NPs). Several types of tumor cells (breast, pancreas, colon, prostate cancers, and some lymphomas) expressed mHSP70 as was determined by flow cytometry and confocal microscopy both in 2D and 3D cultures. Core NPs were formed by chitosan (C) conjugated to allocolchicinoid, which was used as a model drug (D). mAbs (A) targeting mHSP70 were complexed with succinylchitosan and used as NP shells forming final CAD-NPs. These NPs were characterized by size, charge, and functional activity. CAD-NPs were shown to have additional toxicity in comparison with CD-NPs in mHSP7-positive cells. Taken collectively, this study shows that mAb to mHSP70 can be used as a targeting vector in antitumor therapy.