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Issue 11, 2020
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Peptide-based delivery vectors with pre-defined geometrical locks

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Abstract

Design of peptide-based targeted delivery vectors with attributes of specificity and selective cellular targeting by fixing their topology and resulting electrostatic fingerprint is the objective of this study. We formulated our peptide design platform by utilizing the possibilities of side-chain induced geometric restrictions in a typical peptide molecule. Conceptually, we locked the conformation of the RGD/NGR motif of tumor homing peptides (THPs) by mutating glycine in these motifs with D-proline and tailed the peptides with a syndiotactic amphipathic segment for cellular penetration. The designed peptides were synthesized, characterized, and tested in vitro on various cell lines, including breast cancer (MDA-MB-231), cervical cancer (HeLa), osteosarcoma (U2-OS) and non-cancer mammary epithelial cells (MCF-10A), by flow cytometry and confocal microscopy. The results showed differential cellular uptake in different cell types, as a result of the distinct electrostatic fingerprint encoded in their design. The uptake of serum pre-treated peptides by cells reveals the retention of peptide activity even after the incubation with serum. In addition, peptide–methotrexate (MTX) conjugates compared to the methotrexate drug showed enhanced apoptotic cell death in MTX-resistant MDA-MB-231 cells, indicating the increase in MTX bioavailability.

Graphical abstract: Peptide-based delivery vectors with pre-defined geometrical locks

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Supplementary files

Article information


Submitted
04 Jul 2020
Accepted
05 Aug 2020
First published
13 Aug 2020

RSC Med. Chem., 2020,11, 1303-1313
Article type
Research Article

Peptide-based delivery vectors with pre-defined geometrical locks

R. Goyal, G. Jerath, A. Chandrasekharan, T. R. S. Kumar and V. Ramakrishnan, RSC Med. Chem., 2020, 11, 1303
DOI: 10.1039/D0MD00229A

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