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Tc-99m-leukocytes--is it an intracellular labelling?
B Gutfilen1, A Rossini, F P Martins
1Universidade Federal do Rio de Janeiro Faculdade de Medicina-Departamento de Radiologia Hospital Universitário Clementino Fraga Filho Av. Brigadeiro Trompovsky s/no Ilha do Fundão-Rio de Janeiro 21941-590 Brasil. audiocompany@unikey.com.br
Journal of Clinical & Laboratory Immunology
|June 27, 2001
Summary
Technetium-99m (Tc-99m) labeled white blood cells (WBC) are promising for inflammation detection. Most radioactivity binds to the cytosol, indicating an intracellular labeling process targeting cytoplasm components.
Area of Science:
- Nuclear medicine
- Cell biology
- Biochemistry
Background:
- Radiolabeled leukocytes show potential for diagnosing inflammatory conditions.
- Technetium-99m (Tc-99m) labeled white blood cells (WBC) are of significant clinical interest.
- Understanding Tc-99m binding sites on WBC is crucial for optimizing diagnostic applications.
Purpose of the Study:
- To investigate the specific binding sites of Tc-99m within labeled leukocytes.
- To characterize the intracellular localization of Tc-99m in WBC using differential centrifugation.
- To evaluate a simple and low-cost labeling technique (SnTec).
Main Methods:
- Differential centrifugation was employed to separate cellular components of labeled leukocytes.
- Technetium-99m (Tc-99m) was used to label white blood cells (WBC).
- Radioactivity distribution was analyzed across different cellular fractions.
Main Results:
- The majority of radioactivity was found to be bound to the cytosol fraction.
- Differential centrifugation revealed Tc-99m localization within the intracellular components of WBC.
- The SnTec technique facilitated the study of Tc-99m binding.
Conclusions:
- The labeling procedure for Tc-99m WBC is predominantly intracellular.
- Key targets for Tc-99m binding include the cytoplasm, soluble molecules, and membrane-unbound ribosomes.
- This understanding aids in refining WBC radiolabeling for improved inflammation imaging.