Polymer Formation and Altered Biodistribution of IgG Labeled with $^{99m}Tc$ and Cyclic DTPA

항체의 Cyclic DTPA를 이용한 $^{99m}Tc$ 표지시 Polymer 형성과 체내 동태 변화

  • Lim, Sang-Moo (Department of Nuclear Medicine, Korea Cancer Center Hospital) ;
  • Woo, Kwang-Sun (Department of Nuclear Medicine, Korea Cancer Center Hospital) ;
  • Chung, Wee-Sup (Department of Nuclear Medicine, Korea Cancer Center Hospital) ;
  • Awh, Ok-Doo (Department of Medical Technology, College of Health Science, Yonsei University)
  • 임상무 (원자력병원 핵의학과) ;
  • 우광선 (원자력병원 핵의학과) ;
  • 정위섭 (원자력병원 핵의학과) ;
  • 오옥두 (연세대학교 보건과학대학 임상병리학과교실)
  • Published : 1993.11.15

Abstract

$Technetium-^{99m}$ labeling method using bifunctional chelating agent cyclic DTPA has been evaluated with human polyclonal nonspecific IgG. IgG was conjugated with cyclic DTPA with various molar ratio. Reduction of $^{99m}Tc$ was done with $Na_2S_2O_4$ with various molar excess. Labeling efficiency and identification of polymer was confirmed with HPLC using TSK4000 SW column. Polymer was purified with 100 cm Sepharose 6LB column. Cultured $1{\times}10^9$ Staphylococcus aureus were injected into rat thigh 24 hours later labeled IgG was injected, and in vivo distribution was observed 4 and 24 hours thereafter. Reduction of $^{99m}Tc$ was optimal with the 10000-50000 times molar excess of $Na_2S_2O_4$. Polymer formation increased with increasing mloar excess of cyclic DTPA to IgG. Three step labeling-labeling DTPA conjugated IgG after reduction of $^{99m}Tc$-made more polymer than two two step labeling-simultaneous mixing DTPA conjugated IgG, $^{99m}Tc$ and $Na_2S_2O_4$. $^{99m}Tc$ blood clearance and lower uptake in the abscess and other organs. IgG conjugated with 200 times molar excess of cyclic DTPA showed slower blood clearance with 200 times molar excess of cyclic DTPA showed slower blood clearance than that of 200 times molar excess of cyclic DTPA showed slower blood clearance than that of 20 times molar excess. In the $^{99m}Tc$ labeling of IgG with cyclic DTPA for the immunoscintigraphy, obtimal labeling condition should be chosen, and effect of the $^{99m}Tc$ labeled IgG polymer should be considered.

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