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Liposomes pp 469-491 | Cite as

Techniques for Loading Technetium-99m and Rhenium-186/188 Radionuclides into Pre-formed Liposomes for Diagnostic Imaging and Radionuclide Therapy

  • Beth Goins
  • Ande Bao
  • William T. Phillips
Protocol
Part of the Methods in Molecular Biology™ book series (MIMB, volume 606)

Abstract

Liposomes can serve as carriers of radionuclides for diagnostic imaging and therapeutic applications. Herein, procedures are outlined for radiolabeling liposomes with the gamma-emitting radionuclide, technetium-99m (99mTc), for non-invasive detection of disease and for monitoring the pharmacokinetics and biodistribution of liposomal drugs, and/or with therapeutic beta-emitting radionuclides, rhenium-186/188 (186/188Re), for radionuclide therapy. These efficient and practical liposome radiolabeling methods use a post-labeling mechanism to load 99mTc or 186/188Re into pre-formed liposomes prepared in advance of the labeling procedure. For all liposome radiolabeling methods described, a lipophilic chelator is used to transport 99mTc or 186/188Re across the lipid bilayer of the pre-formed liposomes. Once within the liposome interior, the pre-encapsulated glutathione or ammonium sulfate (pH) gradient provides for stable entrapment of the 99mTc and 186/188Re within the liposomes. In the first method, 99mTc is transported across the lipid bilayer by the lipophilic chelator, hexamethylpropyleneamine oxime (HMPAO) and 99mTc-HMPAO becomes trapped by interaction with the pre-encapsulated glutathione within the liposomes. In the second method, 99mTc or 186/188Re is transported across the lipid bilayer by the lipophilic chelator, N,N-bis(2-mercaptoethyl)-N’,N’-diethylethylenediamine (BMEDA), and 99mTc-BMEDA or 186/188Re-BMEDA becomes trapped by interaction with pre-encapsulated glutathione within the liposomes. In the third method, an ammonium sulfate (pH) gradient loading technique is employed using liposomes with an extraliposomal pH of 7.4 and an interior pH of 5.1. BMEDA, which is lipophilic at pH 7.4, serves as a lipophilic chelator for 99mTc or 186/188Re to transport the radionuclides across the lipid bilayer. Once within the more acidic liposome interior, 99mTc/186/188Re-BMEDA complex becomes protonated and more hydrophilic, which results in stable entrapment of the 99mTc/186/188Re-BMEDA complex within the liposomes. Since many commercially available liposomal drugs use an ammonium sulfate (pH) gradient for drug loading, these liposomal drugs can be directly radiolabeled with 99mTc-BMEDA for non-invasive monitoring of tissue distribution during treatment or with 186/188Re-BMEDA for combination chemo-radionuclide therapy.

Key words

Radionuclide Radiolabeling Liposomes Scintigraphy Imaging Rhenium Technetium-99m Nanoparticle Radiopharmaceutical Nuclear medicine 

Notes

Acknowledgements

The authors would like to thank Anuradha Soundararajan for her help in acquiring the images depicted in Fig. 4 and Jonathan Sumner for his help in preparing the figures displayed in this chapter. This work was supported by NIH National Cancer Institute Cancer Center Specialized Programs of Research Excellence grant 5 P30 CA054174-16.

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Copyright information

© Humana Press, a part of Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of RadiologyUniversity of Texas Health Science CenterSan AntonioUSA

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