Imaging and Pharmacokinetics of 64Cu-DOTA-HB22.7 Administered by Intravenous, Intraperitoneal, or Subcutaneous Injection to Mice Bearing Non-Hodgkin’s Lymphoma Xenografts
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- Martin, S.M., O’Donnell, R.T., Kukis, D.L. et al. Mol Imaging Biol (2009) 11: 79. doi:10.1007/s11307-008-0148-1
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The aim of the study is to compare the tumor-specific targeting, pharmacokinetics, and biodistribution of 64Cu-DOTA-HB22.7 when administered to xenograft-bearing mice intravenously (IV), intraperitoneally (IP), and subcutaneously (SQ).
Mice bearing human non-Hodgkin’s lymphoma (NHL) xenografts were injected IV, IP, or SQ with 64Cu-DOTA-HB22.7. Xenograft targeting was evaluated by micro positron emission tomography (microPET) and confirmed by organ biodistribution studies. Blood measurements of 64Cu were performed to determine the pharmacokinetics and clearance of 64Cu-DOTA-HB22.7.
64Cu-DOTA-HB22.7 demonstrated equivalent tumor targeting within 24–48 h, regardless of the route of administration. Organ biodistribution confirmed tumor-specific targeting. Blood pharmacokinetics demonstrated that 64Cu-DOTA-HB22.7 accessed the bloodstream after IP and SQ administration to a similar degree as IV administration, albeit at a slower rate.
These findings establish 64Cu-DOTA-HB22.7 as a potential radioimmunotherapeutic and/or NHL-specific imaging agent. These findings provide evidence that IP and SQ administration can achieve results equivalent to IV administration and may lead to more efficient, reproducible treatment plans for antibody-based therapeutics.
Key wordsHB22.7 CD22 Non-Hodgkin’s lymphoma PET 64Cu
1,4,7,10-tetraazacyclododecane-N,N′,N′′,N′′′-tetraacetic acid mono(N-hydroxysuccinimidyl ester)
thin layer chromatography