Delivery of gadolinium-labeled nanoparticles to the sentinel lymph node: Comparison of the sentinel node visualization and estimations of intra-nodal gadolinium concentration by the magnetic resonance imaging

Hisataka Kobayashi, Satomi Kawamoto, Marcelino Bernardo, Martin W. Brechbiel, Michael V. Knopp, Peter L. Choyke

Research output: Contribution to journalArticlepeer-review

Abstract

Sentinel node imaging is commonly performed prior to surgery for breast cancer and melanoma. While current methods are based on radio- lymphoscintigraphy, MR lymphangiography (MRL) offers the benefits of better spatial resolution without ionizing radiation. However, the optimal nanoparticle for imaging the sentinel nodes remains unclear. Gadolinium-labeled (Gd) contrast agents ranging in diameter from < 1 to 12 nm were evaluated to determine which size provides the most rapid and most concentrated delivery of contrast agent to the lymph nodes in a mouse model of lymphatic metastases. Specifically, PAMAM-G2, -G4, -G6 and -G8, and DAB-G5 Gd-dendrimer agents, as well as Gadomer-17 and Gd-DTPA, were compared. Among these agents, the G6 Gd dendrimer depicted the lymphatics and lymph nodes with the highest peak concentrations and this occurred 24-36 min post-injection (p < 0.01; all except G8). Based on ex vivo concentration phantoms, high accumulations of Gd(III) ions occurred within lymph nodes (1.7-4.4 mM Gd/270-680 ppm Gd) with high target to background ratios (> 100). These concentrations are sufficient to contemplate the use of Gd-neutron capture therapy of regional lymph nodes. Thus, when injected interstitially, the PAMAM-G6 Gd dendrimer not only provides excellent opacification of sentinel lymph nodes, but also provides the potential for targeted therapy of sentinel lymph nodes.

Original languageEnglish (US)
Pages (from-to)343-351
Number of pages9
JournalJournal of Controlled Release
Volume111
Issue number3
DOIs
StatePublished - Apr 10 2006

Keywords

  • Breast cancer
  • Gadolinium neutron capture therapy
  • MRI
  • Nanoparticle
  • Sentinel lymph node

ASJC Scopus subject areas

  • Pharmaceutical Science

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