Cited by 64Dendrimers and Hyperbranched PolymersNanoparticle-Based Drug DeliveryAdvanced Drug Delivery Systems

Capping methotrexate α-carboxyl groups enhances systemic exposure and retains the cytotoxicity of drug conjugated PEGylated polylysine dendrimers.

Kaminskas, Lisa M., Kelly, Brian D., McLeod, Victoria M., Sberna, Gian, Boyd, Ben J., Owen, David J., Porter, Christopher J. H.·2011·Molecular Pharmaceutics

Abstract

A generation 5 PEGylated (PEG 1100) polylysine dendrimer, conjugated via a stable amide linker to OtBu protected methotrexate (MTX), was previously shown to have a circulatory half-life of 2 days and to target solid tumors in both rats and mice. Here, we show that deprotection of MTX and substitution of the stable linker with a matrix metalloproteinase (MMP) 2 and 9 cleavable linker (PVGLIG) dramatically increased plasma clearance and promoted deposition in the liver and spleen (50-80% of the dose recovered in the liver 3 days post dose). Similar rapid clearance was also seen using a scrambled peptide suggesting that clearance was not dependent on the cleavable nature of the linker. Surprisingly, dendrimers where OtBu capped MTX was linked to the dendrimer surface via the hexapeptide linker showed equivalent in vitro cytotoxicity against HT1080 cells when compared to the uncapped dendrimer and also retained the long circulating characteristics of the stable constructs. The OtBu capped MTX conjugated dendrimer was subsequently shown to significantly reduce tumor growth in HT1080 tumor bearing mice compared to control. In contrast the equivalent dendrimer comprising uncapped MTX conjugated to the dendrimer via the same hexapeptide linker did not reduce tumor growth, presumably reflecting very rapid clearance of the construct. The results are consistent with the suggestion that protection of the α-carboxyl group of methotrexate may be used to improve the circulatory half-life and reduce the liver accumulation of similar MTX-conjugated dendrimers, while still retaining antitumor activity in vivo.

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Crossref · 10.1021/mp1001872

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  • Dendrimer use in biological systems is limited due to complex synthetic procedures and toxicity issues.

    “Although, dendrimers have wide application in drug delivery, yet their use in biological systems is limited due to complex synthetic procedures and toxicity issues”

    From Nanotechnology: A Promising Approach for Delivery of Neuroprotective Drugs (2020) · cites this paper as Kaminskas et al., 2011

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Authors
Kaminskas, L. M., Kelly, B. D., McLeod, V. M., Sberna, G., Boyd, B. J., Owen, D. J., & Porter, C. J. H.
Affiliations
  • Monash University (AU)
  • Starpharma (Australia) (AU)
Corresponding author
Porter, Christopher J. H.
Venue
Molecular Pharmaceutics
Published
2011-01-21
Volume
8
Issue
2
Pages
338-349
ISSN
  • 1543-8384 (ISSN-L)
  • 1543-8392
OpenAlex
W2327486849
Cited by
64
References
37
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 2 · 2020: 4 · 2019: 1 · 2018: 1 · 2017: 8 · 2016: 8 · 2015: 8 · 2014: 9 · 2013: 5 · 2012: 9
FWCI
3.97
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Pharmaceutics (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Health and Medical Research Council
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Dendrimers and Hyperbranched Polymers
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Advanced Drug Delivery Systems
Keywords
methotrexate, PEGylation, plasma clearance, circulatory half-life, liver accumulation, tumor targeting, cytotoxicity, anticancer activity, drug conjugation
MeSH terms
Animals, Antimetabolites, Antineoplastic, Fibrosarcoma, Kidney, Male, Metabolic Clearance Rate, Methotrexate, Mice, Inbred BALB C, Mice, Nude, Polyethylene Glycols, Polylysine, Tissue Distribution, Tumor Cells, Cultured, Drug Delivery Systems, Rats, Sprague-Dawley, Apoptosis, Cell Proliferation, Dendrimers, Mice, Rats

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