Pharmacokinetics of intrathecal transferrin-ricin A chain immunotoxin
| Autor: | Marco Colombatti, Marina Tommasi, Giuseppina Benoni, Alessandra Adami, Giulio Fracasso, Irene Lorenzetti, Carola Candiani, Giuseppe Tridente |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Cell Survival
Transferrin receptor Ricin Pharmacology General Biochemistry Genetics and Molecular Biology Jurkat Cells Route of administration chemistry.chemical_compound Bolus (medicine) Cerebrospinal fluid Pharmacokinetics Immunotoxin Receptors Transferrin Animals Humans Medicine General Pharmacology Toxicology and Pharmaceutics Injections Spinal chemistry.chemical_classification business.industry Immunotoxins General Medicine Rats chemistry Transferrin Area Under Curve Injections Intravenous business Half-Life |
| Popis: | We have studied the pharmacokinetics of an anti transferrin receptor immunotoxin following intrathecal (i.t.) and intravenous (i.v.) bolus inoculation in healthy rats. After i.t. inoculation of 4.9 μg transferrin-ricin A-chain (Tfn-RTA) we have measured the immunotoxin concentration in the cerebrospinal fluid (CSF), in the brain tissue and in the peripheral blood. After i.v. administration of 4.9 μg Tfn-RTA the concentration of Tfn-RTA immunotoxin was evaluated in the peripheral blood. We found that the clearance of Tfn-RTA from the CSF is rapid (9.1 μLmin −1 ), the immunotoxin then diffuses into the brain tissue and in the peripheral blood where it reaches concentrations below the MTC 50 (Minimum Toxin Concentration 50%). The rate of immunotoxin elimination from the peripheral blood following either i.v. or i.t. administration are similar (k el = 0.0021 min −1 vs. 0.0025 min −1 ). Thus, in the healthy rat the immunotoxin does not accumulate following i.t. inoculation, reaching non toxic concentrations in the brain tissue and in the peripheral blood, whereas in the CSF as well as at the interface CSF/brain tissue the immunotoxin may reach potentially therapeutic concentrations. In conclusion we believe that the i.t. inoculation of an immunotoxin could be considered a potentially useful route of administration in the treatment of leptomeningeal carcinomatosis. |
| Databáze: | OpenAIRE |
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