Enhanced tumor visualization by gamma-scintigraphy with 111In-labeled polychelating-polymer-containing immunoliposomes

Mol Pharm. 2006 Sep-Oct;3(5):525-30. doi: 10.1021/mp060055t.

Abstract

Here, we have prepared long-circulating PEGylated liposomes heavily loaded with 111In via the liposome-incorporated polylysine-based (PLL-based) polychelating amphiphilic polymer (PAP) and additionally modified with the monoclonal antibody 2C5 (mAb 2C5) possessing the nucleosome-restricted (NS-restricted) specificity and capable of specific recognition of a broad variety of live cancer cells via the cancer cell surface bound NSs. These liposomes have been tested as a tumor-specific contrast agent for the gamma-scintigraphic visualization of model tumors in mice. The tumor accumulation of mAb 2C5 modified liposomes prepared in this study was significantly (3-to-5-fold) higher than in the neighboring muscle tissue at all times after administration (6, 24, and 48 h) in mice bearing murine Lewis lung carcinoma (LLC) and human HT-29 tumors. The whole body direct gamma-imaging of LLC tumor bearing mice at different times has demonstrated the superior in vivo tumor accumulation of the targeted mAb 2C5 modified PAP-containing PEGylated liposomes compared to nontargeted liposomal control formulations, which resulted in better and faster tumor imaging as shown with LLC-bearing mice.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Antibodies, Monoclonal / immunology
  • Antibodies, Monoclonal / pharmacokinetics
  • Carcinoma, Lewis Lung / diagnostic imaging*
  • Carcinoma, Lewis Lung / immunology
  • Carcinoma, Lewis Lung / metabolism
  • Chelating Agents / chemistry*
  • Indium Radioisotopes
  • Liposomes / chemistry
  • Liposomes / immunology
  • Liposomes / pharmacokinetics*
  • Mice
  • Polymers / chemistry*
  • Radionuclide Imaging / methods
  • Time Factors

Substances

  • Antibodies, Monoclonal
  • Chelating Agents
  • Indium Radioisotopes
  • Liposomes
  • Polymers