Delivery of hexosaminidase A to the cerebrum after osmotic modification of the blood--brain barrier
| Autor: | J. A. Barranger, G. E. Mook, Jane M. Quirk, F S Furbish, Michael Pagel, Edward A. Neuwelt, Eugene P. Frenkel, R. O. Brady |
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| Rok vydání: | 1981 |
| Předmět: |
medicine.medical_treatment
Pharmacology Blood–brain barrier medicine Animals Hexosaminidase chemistry.chemical_classification Chemotherapy Multidisciplinary Dose-Response Relationship Drug Neurotoxicity Brain Water-Electrolyte Balance medicine.disease Rats Hexosaminidases Enzyme medicine.anatomical_structure chemistry Blood-Brain Barrier Immunology Tonicity Female Methotrexate Mannitol Research Article medicine.drug |
| Zdroj: | Proceedings of the National Academy of Sciences. 78:5838-5841 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.78.9.5838 |
| Popis: | The present studies were undertaken to evaluate the possibility that hexosaminidase A, the enzyme deficient in Tay--Sachs disease, could be effectively delivered to brain. Previous studies from our laboratory have shown that hypertonic mannitol can be used to osmotically produce reversible disruption of the blood--brain barrier in animals (rat and dog) and man without significant neurotoxicity and that such barrier modification significantly increases the delivery of cytoreductive chemotherapy agents to selected areas of brain. By using the rat model of blood--brain barrier modification and radiolabeled enzyme, increased hexosaminidase A delivery to brain has been demonstrated in more than 85 animals. The time of injection of hexosaminidase A after blood--brain barrier disruption is critical for maximum delivery. Rapid (over 30 sec) intra-arterial administration of hexosaminidase A immediately after blood--brain barrier disruption resulted in a marked increase in enzyme delivery to the brain when compared with controls without prior barrier disruption. When the enzyme was administered 15-20 min after barrier disruption, approximately 50% less hexosaminidase A was delivered; when given 60-120 min after barrier modification, the amount delivered was the same as in control animals. This critical time course is very different than that seen in trials of low molecular weight chemotherapeutic agents (methotrexate and adriamycin). These preliminary studies suggest that hexosaminidase A can be delivered to the brain by blood--brain barrier modification and may be indicative of the potential for enzyme replacement in patients who hae Tay--Sachs disease. |
| Databáze: | OpenAIRE |
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