Archives of Pharmacal Research

The Pharmaceutical Society of Korea (대한약학회)
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$Site-Specific^{99m}$Tc-Labeling of Antibody Using Dihydrazinoph-thalazine (DHZ) Conjugation to Fc Region of Heavy Chain

  • Jeong, Jae-Min (Department of Nuclear Medicine, Cancer Research Institute, Seoul National University College of Medicine) ;
  • Lee, Jae-Tae (Department of Nuclear Medicine, Kyungpook National University School of Medicine) ;
  • Paik, Chang-Hum (Nuclear Medicine Department, Warren G. Magnuson Clinical Center, National Institutes of Health) ;
  • Kim, Dae-Kee (Department of Pharmacy, Ewha Womans University) ;
  • Lee, Dong-Soo (Department of Nuclear Medicine, Seoul National University College of Medicine) ;
  • Chung, June-Key (Department of Nuclear Medicine, Cancer Research Institute, Seoul National University College of Medicine) ;
  • Lee, Myung-Chul (Department of Nuclear Medicine, Seoul National University College of Medicine)
  • Published : 2004.09.01
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Abstract

The development of an antibody labeling method with $^{99m}$Tc is important for cancer imaging. Most bifunctional chelate methods for $^{99m}$Tc labeling of antibody incorporate a $^{99m}$Tc chelator through a linkage to lysine residue. In the present study, a novel site-specific $^{99m}$Tc labeling method at carbohydrate side chain in the Fc region of 2 antibodies (T101 and rabbit anti-human serum albumin antibody (RPAb)) using dihydrazinophthalazine (DHZ) which has 2 hydrazino groups was developed. The antibodies were oxidized with sodium periodate to pro-duce aldehyde on the Fc region. Then, one hydrazine group of DHZ was conjugated with an aldehyde group of antibody through the formation of a hydrazone. The other hydrazine group was used for labeling with $^{99m}$Tc. The number of conjugated DHZ was 1.7 per antibody. $^{99m}$Tc labeling efficiency was 46-85％ for T101 and 67∼87％ for RPAb. Indirect labeling with DHZ conjugated antibodies showed higher stability than direct labeling with reduced antibodies. High immunoreactivities were conserved for both indirectly and directly labeled antibodies. A biodistribution study found high blood activity related to directly labeled T1 01 at early time point as well as low liver activity due to indirectly labeled T101 at later time point. However, these findings do not affect practical use. No significantly different biodistribution was observed in the other organs. The research concluded that DHZ can be used as a site-specific bifunctional chelating agent for labeling antibody with $^{99m}$Tc. Moreover, $^{99m}$Tc labeled antibody via DHZ was found to have excellent chemical and biological properties for nuclear medicine imaging.edicine imaging.

Keywords

References

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