Pluripotent stem cell derived dopaminergic subpopulations model the selective neuron degeneration in Parkinson's disease
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In Parkinson's disease (PD), substantia nigra (SN) dopaminergic (DA) neurons degenerate, while related ventral tegmental area (VTA) DA neurons remain relatively unaffected. Here, we present a methodology that directs the differentiation of mouse and human pluripotent stem cells toward either SN- or VTA-like DA lineage and models their distinct vulnerabilities. We show that the level of WNT activity is critical for the induction of the SN- and VTA-lineage transcription factors Sox6 and Otx2, respectively. Both WNT signaling modulation and forced expression of these transcription factors can drive DA neurons toward the SN- or VTA-like fate. Importantly, the SN-like lineage enriched DA cultures recapitulate the selective sensitivity to mitochondrial toxins as observed in PD, while VTA-like neuron-enriched cultures are more resistant. Furthermore, a proteomics approach led to the identification of compounds that alter SN neuronal survival, demonstrating the utility of our strategy for disease modeling and drug discovery.Keywords: derivation of substantia nigra dopaminergic neuronal lineage from pluripotent stem cells; directed differentiation of pluripotent stem cells into distinct dopaminergic subpopulations; modeling selective dopaminergic vulnerability in vitro; pluripotent stem cell-based model of Parkinson's disease.
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