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Evaluation of Liposome-Entrapped Radioactive Tracers as Scanning Agents. Part 1: Organ Distribution of Liposome [^99mTc-DTPA] in Mice

Yale University School of Medicine, New Haven, Connecticut

Correspondence: For reprints contact: V. J. Caride, Nuclear Medicine Sect., Yale University School of Medicine, 333 Cedar St., New Haven, CT 06510.

ABSTRACT

We describe the use of liposomes as a delivery system for radiopharmaceutical localization. Liposomes [^99mTc-DTPA] were injected intravenously in mice and showed preferential uptake in the liver and spleen. There was a steady decline of activity in all organs, suggestive of destruction of liposomes with subsequent release of ^99mTc-DTPA into the circulation. Alteration of uptake from liver to spleen, lung, and bone marrow was achieved by prior loading of the circulation with nonradioactive liposomes. The same effect was produced in dogs and demonstrated with scintigraphy. We also showed scintigraphically in dogs how ^99mTc-DTPA, when administered entrapped in liposomes, follows the pattern of distribution of liposomes. Liposomes seem to be suitable carriers for radiopharmaceuticals. Further studies should show the possibility of directing liposomes to specific targets.

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