Abstract
Effective cell replacement therapies for neurological disease require neuron-restricted precursors as grafted cells. The problem of obtaining sufficient grafts for transplantation can be resolved by creating an appropriate immortalized cell line. In the present study, a thermally controlled immortalized GABAergic neuronal progenitor cell line (RMNE6) was established from E13 rat ventral mesencephalon cells immortalized using the temperature-sensitive mutant of SV40 large T antigen (ts-TAg). RMNE6 cells proliferated rapidly and expressed a neuron-like phenotype at the permissive temperature (33 degrees C), but eventually stopped growing at the non-permissive temperature (39 degrees C). Expression of the neuronal markers PSA-NCAM, beta-tubulin III and MAP2 by RMNE6 cells was confirmed by RT-PCR or immunocytochemistry. Furthermore, these cells exhibited functional GABAergic neuron properties, as evidenced by the expression of glutamate decarboxylase (GAD) as well as the synthesis and release of the neurotransmitter GABA in a calcium-dependent manner. Moreover, RMNE6 cells spontaneously expressed and secreted several neurotrophic factors, such as NGF, BDNF, NT-3, NT-4/5, and GDNF. The cells survived well and kept expression of SV40...Continue Reading
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