Kinetics of liposome-encapsulated hemoglobin after 25% hypovolemic exchange transfusion
| Autor: | D. Garcia, Vibhudutta Awasthi, R. Klipper, Beth Goins, William T. Phillips |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Liposome-encapsulated hemoglobin
Male medicine.medical_specialty medicine.medical_treatment Kinetics Hypovolemia Pharmaceutical Science Exchange transfusion Spleen Blood Component Transfusion Blood substitute Rats Sprague-Dawley Hemoglobins Internal medicine Medicine Animals Tissue Distribution Liposome business.industry Rats medicine.anatomical_structure Endocrinology Liver Anesthesia Liposomes Hemoglobin Rabbits business Blood sampling Half-Life |
| Zdroj: | International journal of pharmaceutics. 283(1-2) |
| ISSN: | 0378-5173 |
| Popis: | Liposome-encapsulated hemoglobin (LEH) is being developed as an oxygen therapeutic. In this work, we evaluated a neutral formulation of PEGylated LEH for its circulation and distribution properties in rodent models of 25% hypovolemic exchange transfusion. About 25% of blood in rats and rabbits was exchanged with LEH that had been previously labeled with 99mTc radionuclide. The distribution of 99mTc-LEH was followed by gamma camera imaging and intermittent blood sampling during 48 h, and counting the tissue-associated radioactivity after necropsy at 48 h. On the basis of circulation kinetics, the half-life of 99mTc-LEH in blood was 30 and 39.8 h in rats and rabbits, respectively. Apart from blood, major organs of accumulation of LEH after 48 h included liver (rats, 10.3% and rabbits, 5.4% of injected dose) and spleen (rats, 2.4% and rabbits, 0.8% of injected dose). The results demonstrate that LEH circulates for a prolonged time after administration and that the animals tolerate at least 25% of blood exchange without any distress. Subsequent to the enhanced uptake in the RES, the rats clear LEH from the circulation faster than the rabbits. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect