Abstract | BACKGROUND: The positron-emitting radionuclide (89)Zr (t(1/2) = 3.17 days) was used to prepare (89)Zr-radiolabeled trastuzumab for use as a radiotracer for characterizing HER2/neu-positive breast tumors. In addition, pharmacodynamic studies on HER2/neu expression levels in response to therapeutic doses of PU-H71 (a specific inhibitor of heat-shock protein 90 [Hsp90]) were conducted. METHODOLOGY/PRINCIPAL FINDINGS:
Trastuzumab was functionalized with desferrioxamine B (DFO) and radiolabeled with [(89)Zr]Zr- oxalate at room temperature using modified literature methods. ImmunoPET and biodistribution experiments in female, athymic nu/nu mice bearing sub-cutaneous BT-474 (HER2/neu positive) and/or MDA-MB-468 (HER2/neu negative) tumor xenografts were conducted. The change in (89)Zr-DFO-trastuzumab tissue uptake in response to high- and low-specific-activity formulations and co-administration of PU-H71 was evaluated by biodistribution studies, Western blot analysis and immunoPET. (89)Zr-DFO-trastuzumab radiolabeling proceeded in high radiochemical yield and specific-activity 104.3+/-2.1 MBq/mg (2.82+/-0.05 mCi/mg of mAb). In vitro assays demonstrated >99% radiochemical purity with an immunoreactive fraction of 0.87+/-0.07. In vivo biodistribution experiments revealed high specific BT-474 uptake after 24, 48 and 72 h (64.68+/-13.06%ID/g; 71.71+/-10.35%ID/g and 85.18+/-11.10%ID/g, respectively) with retention of activity for over 120 h. Pre-treatment with PU-H71 was followed by biodistribution studies and immunoPET of (89)Zr-DFO-trastuzumab. Expression levels of HER2/neu were modulated during the first 24 and 48 h post-administration (29.75+/-4.43%ID/g and 41.42+/-3.64%ID/g, respectively). By 72 h radiotracer uptake (73.64+/-12.17%ID/g) and Western blot analysis demonstrated that HER2/neu expression recovered to baseline levels. CONCLUSIONS/SIGNIFICANCE: The results indicate that (89)Zr-DFO-trastuzumab provides quantitative and highly-specific delineation of HER2/neu positive tumors, and has potential to be used to measure the efficacy of long-term treatment with Hsp90 inhibitors, like PU-H71, which display extended pharmacodynamic profiles.
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Authors | Jason P Holland, Eloisi Caldas-Lopes, Vadim Divilov, Valerie A Longo, Tony Taldone, Danuta Zatorska, Gabriela Chiosis, Jason S Lewis |
Journal | PloS one
(PLoS One)
Vol. 5
Issue 1
Pg. e8859
(Jan 25 2010)
ISSN: 1932-6203 [Electronic] United States |
PMID | 20111600
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
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Chemical References |
- Antibodies, Monoclonal
- Antibodies, Monoclonal, Humanized
- Benzodioxoles
- HSP90 Heat-Shock Proteins
- Purines
- 9H-purine-9-propanamine, 6-amino-8-((6-iodo-1,3-benzodioxol-5-yl)thio)-N-(1-methylethyl)-
- Zirconium
- Deferoxamine
- Trastuzumab
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Topics |
- Animals
- Antibodies, Monoclonal
(chemistry, pharmacology)
- Antibodies, Monoclonal, Humanized
- Benzodioxoles
(pharmacokinetics, pharmacology)
- Cell Line, Tumor
- Deferoxamine
(chemistry)
- Female
- Genes, erbB-2
- HSP90 Heat-Shock Proteins
(antagonists & inhibitors)
- Humans
- Mice
- Mice, Nude
- Purines
(pharmacokinetics, pharmacology)
- Tissue Distribution
- Trastuzumab
- Zirconium
(chemistry)
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