Tetrahydrobiopterin-dependent functional recovery in 6-hydroxydopamine-treated rats by intracerebral grafting of fibroblasts transfected with tyrosine hydroxylase cDNA
| Autor: | Shinichi Kohsaka, Toshiharu Nagatsu, Naoko Tsuzaki, Kohichi Uchida |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
medicine.medical_specialty
Apomorphine Tyrosine 3-Monooxygenase Striatum Biology Transfection Levodopa Developmental Neuroscience Internal medicine medicine Animals Rats Wistar Fibroblast Oxidopamine Cell Line Transformed Hydroxydopamine Tyrosine hydroxylase Behavior Animal Brain Tetrahydrobiopterin DNA Fibroblasts Biopterin Rats medicine.anatomical_structure Endocrinology Neurology Catecholaminergic cell groups Female Stereotyped Behavior medicine.drug |
| Zdroj: | Developmental neuroscience. 14(2) |
| ISSN: | 0378-5866 |
| Popis: | Fibroblasts (NRK-49F) were transfected with human type 2 tyrosine hydroxylase (TH; EC 1.14.16.29) cDNA, to clarify the mechanism involved in amelioration of parkinsonism by intracerebral grafting of catecholaminergic neurons and to investigate its possible use as a donor material. These genetically manipulated fibroblasts did not develop into a mass of tissue, and survived well in the host striatum. Expression of the TH minigene in the cells was successful even when they were transplanted into the host brain. Intracerebral microdialysis revealed that a measurable amount of L-3,4-dihydroxyphenylalanine (L-DOPA) was not spontaneously released from the implanted cells into the host striatum. However, release of a large amount of L-DOPA from the cells was observed when (6R)-L-erythro-5,6,7,8-tetrahy-drobiopterin (BH4) was perfused through a dialysis probe. Finally, we investigated whether these BH4-dependent L-DOPA-secreting fibroblasts are able to ameliorate the abnormal behavior of 6-hydroxydopamine-treated rats. Apomorophine-induced rotating behavior was not reversed by the grafting alone, whereas a marked reduction in drug-induced circling was observed temporarily after BH4 was perfused around the implanted cells. These findings indicate that TH cDNA-transfected non-neuronal cells might be able to be used as donor material for intracerebral grafting and ameliorate the abnormal behavior of rats with experimental Parkinson''s disease. |
| Databáze: | OpenAIRE |
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