Mediastinal node and diaphragmatic targeting after intracavitary injection of avidin/99mTc-blue-biotin-liposome system

Luis A. Medina, Sergio M. Calixto, Robert Klipper, Yang Li, William T. Phillips, Beth Goins

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A method for delivering drugs to sites of disease extension in mediastinal nodes is described. Mediastinal node and lymphatic distributions were determined after intracavitary injection of the avidin/biotin-liposome system in normal rats. The effect of the injected dose on lymphatic targeting of liposomes after intraperitoneal injection of 99mTc-blue-biotin-liposomes and intrapleural injection of avidin, and vice versa, is presented. Scintigraphic imaging was used to follow the movement of 99mTc-blue-biotin- liposomes to determine the pharmacokinetics and organ uptake. Tissue biodistribution studies were performed 22 h after injection of the 99mTc-blue-biotin-liposomes. Results indicated that independent of the cavity in which each agent was injected, a dose of 5.0 mg of each agent results in higher mediastinal node targeting (8%-10% ID/Organ) as compared with the injection of a 0.5 mg dose (2%-5% ID/Organ, p < 0.05). Targeting of diaphragm and associated lymphatics was observed when 99mTc-blue- biotin-liposomes were injected in peritoneum and avidin in pleural space. In contrast, pleural, and pericardial lymphatic targeting was observed when 99mTc-blue-biotin-liposomes were injected in pleural space and avidin in peritoneum. Intracavitary injection of the avidin/biotin-liposome system could potentially be used for the delivery of prophylactic drugs that could reduce tumor metastasis and infection spread to mediastinal nodes.

Original languageEnglish (US)
Pages (from-to)207-224
Number of pages18
JournalJournal of Pharmaceutical Sciences
Issue number1
StatePublished - Jan 2006


  • Avidin-biotin system
  • Drug targeting
  • Liposomes
  • Lymphatic transport
  • Nanoparticles
  • Peritoneum
  • Pharmacokinetics
  • Pleural space
  • Scintigraphy
  • Technetium-99m

ASJC Scopus subject areas

  • Pharmaceutical Science


Dive into the research topics of 'Mediastinal node and diaphragmatic targeting after intracavitary injection of avidin/99mTc-blue-biotin-liposome system'. Together they form a unique fingerprint.

Cite this