Cited by 653Nanoparticle-Based Drug DeliveryCharacterization and Applications of Magnetic NanoparticlesNanoplatforms for cancer theranostics

Dextran-coated iron oxide nanoparticles: a versatile platform for targeted molecular imaging, molecular diagnostics, and therapy

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Tassa, Carlos, Shaw, Stanley Y., Weissleder, Ralph·2011·Accounts of Chemical Research

Abstract

Advances in our understanding of the genetic basis of disease susceptibility coupled with prominent successes for molecular targeted therapies have resulted in an emerging strategy of personalized medicine. This approach envisions risk stratification and therapeutic selection based on an individual's genetic makeup and physiologic state (the latter assessed through cellular or molecular phenotypes). Molecularly targeted nanoparticles can play a key role in this vision through noninvasive assessments of molecular processes and specific cell populations in vivo, sensitive molecular diagnostics, and targeted delivery of therapeutics. A superparamagnetic iron oxide nanoparticle with a cross-linked dextran coating, or CLIO, is a powerful and illustrative nanoparticle platform for these applications. These structures and their derivatives support diagnostic imaging by magnetic resonance (MRI), optical, and positron emission tomography (PET) modalities and constitute a versatile platform for conjugation to targeting ligands. A variety of conjugation methods exist to couple the dextran surface to different functional groups; in addition, a robust bioorthogonal [4 + 2] cycloaddition reaction between 1,2,4,5-tetrazene (Tz) and trans-cyclooctene (TCO) can conjugate nanoparticles to targeting ligands or label pretargeted cells. The ready availability of conjugation methods has given rise to the synthesis of libraries of small molecule modified nanoparticles, which can then be screened for nanoparticles with specificity for a specific cell type. Since most nanoparticles display their targeting ligands in a multivalent manner, a detailed understanding of the kinetics and affinity of a nanoparticle's interaction with its target (as determined by surface plasmon resonance) can yield functionally important insights into nanoparticle design. In this Account, we review applications of the CLIO platform in several areas relevant to the mission of personalized medicine. We demonstrate rapid and highly sensitive molecular profiling of cancer markers ex vivo, as part of detailed, individualized molecular phenotyping. The CLIO platform also facilitates targeted magnetic resonance and combined modality imaging (such as MR/PET/fluorescence/CT) to enable multiplexed measurement of molecular phenotypes in vivo for early diagnosis and disease classification. Finally, the targeted delivery of a photodynamic therapy agent as part of a theranostic nanoparticle successfully increased local cell toxicity and minimized systemic side effects.

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  • While dextran has no direct cytotoxic effects, degradation of the dextran shell may influence certain cellular processes.

    “It has to be kept in mind in this regard that while dextran has no direct cytotoxic effects, the degradation of the dextran shell may influence certain cellular processes [30, 65, 86, 87].”
  • Several other variations of this probe have been developed, including for hybrid PET-optical or trimodal imaging.

    “Several other variations of this probe have been developed, including probes used for hybrid PET–optical imaging or even trimodal imaging149.”

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Authors
Tassa, C., Shaw, S. Y., & Weissleder, R.
Affiliations
Harvard University (US)
Corresponding author
Weissleder, Ralph
Venue
Accounts of Chemical Research
Published
2011-06-10
Volume
44
Issue
10
Pages
842-852
ISSN
  • 0001-4842 (ISSN-L)
  • 1520-4898
OpenAlex
W2001338329
Cited by
653
References
73
Citations by year
2026: 9 · 2025: 18 · 2024: 29 · 2023: 40 · 2022: 42 · 2021: 39 · 2020: 44 · 2019: 35 · 2018: 40 · 2017: 41 · 2016: 52 · 2015: 62 · 2014: 76 · 2013: 73 · 2012: 48
FWCI
26.44
Type
journal article
Language
en
Open access
Locations
  • Accounts of Chemical Research (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
  • National Institutes of Health (2r01eb010011-05)
  • National Heart, Lung, and Blood Institute (HHSN268201000044C)
  • National Institute of Biomedical Imaging and Bioengineering (R01 EB-010 011, R01EB004626)
Topics
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
  • Physical Sciences › Engineering › Biomedical Engineering › Characterization and Applications of Magnetic Nanoparticles
  • Physical Sciences › Engineering › Biomedical Engineering › Nanoplatforms for cancer theranostics
Keywords
superparamagnetic iron oxide nanoparticles, targeted molecular imaging, molecular diagnosis, theranostics, personalized medicine, surface plasmon resonance, multiplexed imaging, targeted photodynamic therapy, targeted drug delivery, magnetic resonance imaging, positron emission tomography, fluorescence imaging
MeSH terms
Animals, Dextrans, Ferric Compounds, Humans, Nanomedicine, Nanoparticles, Molecular Imaging, Molecular Targeted Therapy

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