Cited by 181Extracellular vesicles in diseaseRNA Interference and Gene DeliveryNanoparticle-Based Drug Delivery

Anti-HER2 scFv-Directed Extracellular Vesicle-Mediated mRNA-Based Gene Delivery Inhibits Growth of HER2-Positive Human Breast Tumor Xenografts by Prodrug Activation

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Wang, Jing-Hung, Forterre, Alexis V., Zhao, Jinjing, Frimannsson, Daniel O., Delcayre, Alain, Antes, Travis J., Efron, Bradley, Jeffrey, Stefanie S. +2 more·2018·Molecular Cancer Therapeutics

Published version of a preprint

Abstract

This paper deals with specific targeting of the prodrug/enzyme regimen, CNOB/HChrR6, to treat a serious disease, namely HER2+ human breast cancer with minimal off-target toxicity. HChrR6 is an improved bacterial enzyme that converts CNOB into the cytotoxic drug MCHB. Extracellular vesicles (EV) were used for mRNA-based HchrR6 gene delivery: EVs may cause minimal immune rejection, and mRNA may be superior to DNA for gene delivery. To confine HChrR6 generation and CNOB activation to the cancer, the EVHB chimeric protein was constructed. It contains high-affinity anti-HER2 scFv antibody (ML39) and is capable of latching on to EV surface. Cells transfected with EVHB-encoding plasmid generated EVs displaying this protein (“directed EVs”). Transfection of a separate batch of cells with the new plasmid, XPort/HChrR6, generated EVs containing HChrR6 mRNA; incubation with pure EVHB enabled these to target the HER2 receptor, generating “EXO-DEPT” EVs. EXO-DEPT treatment specifically enabled HER2-overexpressing BT474 cells to convert CNOB into MCHB in actinomycin D–independent manner, showing successful and specific delivery of HChrR6 mRNA. EXO-DEPTs—but not undirected EVs—plus CNOB caused near-complete growth arrest of orthotopic BT474 xenografts in vivo, demonstrating for the first time EV-mediated delivery of functional exogenous mRNA to tumors. EXO-DEPTs may be generated from patients' own dendritic cells to evade immune rejection, and without plasmids and their potentially harmful genetic material, raising the prospect of clinical use of this regimen. This approach can be used to treat any disease overexpressing a specific marker. Mol Cancer Ther; 17(5); 1133–42. ©2018 AACR.

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Authors
Wang, J.-H., Forterre, A. V., Zhao, J., Frimannsson, D. O., Delcayre, A., Antes, T. J., Efron, B., Jeffrey, S. S., Pegram, M. D., & Matin, A. C.
Affiliations
  • Stanford Medicine (US)
  • 2ExoThera LLC, Menlo Park, California.
  • System Biosciences (United States) (US)
  • Stanford University (US)
Corresponding author
Matin, A.C.
Venue
Molecular Cancer Therapeutics
Published
2018-04-30
Volume
17
Issue
5
Pages
1133-1142
ISSN
  • 1535-7163 (ISSN-L)
  • 1538-8514
OpenAlex
W2792159629
Cited by
181
References
67
Citations by year
2026: 12 · 2025: 28 · 2024: 33 · 2023: 29 · 2022: 26 · 2021: 17 · 2020: 16 · 2019: 15 · 2018: 5
FWCI
4.71
Type
journal article
Language
en
Open access
Locations
  • Molecular Cancer Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
NIH (UH3TR000902)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
Keywords
HER2-positive breast cancer, extracellular vesicles, prodrug activation, fusion protein, targeted drug delivery, BT474 xenograft, tumor growth inhibition
MeSH terms
Extracellular Vesicles, Animals, Breast Neoplasms, Female, Humans, Mice, Inbred BALB C, Mice, Nude, Oxazines, Prodrugs, RNA, Messenger, Erb-b2 Receptor Tyrosine Kinases, Receptor, ErbB-2, Xenograft Model Antitumor Assays, Cell Line, Tumor, Tumor Burden, Single-Chain Antibodies, MCF-7 Cells

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