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Parkinson's disease (PD) is a neurodegenerative disorder that presents with hallmark clinical symptoms of tremor at rest, bradykinesia, and muscle rigidity. Stem cell therapy has emerged as an experimental treatment for PD. However, optimizing the cell culture condition that allows enhanced survival and differentiation of cells toward the dopaminergic phenotype remains a logistical challenge. Here, we discuss the utility of a combination of neurotrophin-4/5 (NT-4/5) and glial cell line-derived neurotrophic factor (GDNF) in increasing the dopaminergic phenotypic expression of rat ventral mesencephalic (VM) tissue. Using organotypic explant cultures of fetal human ventral mesencephalon, we observed that NT-4/5 and GDNF as single factors, or in combination on DAergic neurons, increased survival and number of tyrosine hydroxylase immunoreactive neurons as well as the dopamine content in the culture medium. The application of specific neurotrophic factors, such as NT-4/5 and GDNF, as cell culture supplements or as adjunctive therapy to cell transplantation may achieve improved functional outcomes when contemplating cell-based regenerative medicine for PD.

Neurotrophic factor-based strategies to enhance survival and differentiation of neural progenitor cells toward the dopaminergic phenotype