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Direct reprogramming of human fibroblasts to expandable induced dopaminergic neuronal progenitors for Parkinson’s disease therapy [Array]

ABSTRACT: Personalized cell therapy is being explored as promising treatments for incurable diseases such as Parkinson’s disease (PD). Here, we directly reprogrammed human fibroblasts into induced dopaminergic neuronal progenitors (hiDPs) and assess their applicability for regenerative PD therapy. We found that hiDPs maintain progenitor characteristics over 20 passages and showed unaltered differentiation potential to midbrain dopaminergic neurons. By next-generation sequencing, we confirm that even long-term cultured hiDPs retain genomic stability, resulting in absence of tumorigenicity when transplanted, indicating preclinical safety. The hiDPs differentiate into highly pure dopaminergic neurons expressing markers associated with positive graft outcomes without unwanted serotonergic neurons known to cause graft-induced dyskinesia. The therapeutic effect and safety were confirmed by transplantation in rodent PD models. Because our optimized reprogramming conditions generate highly expandable hiDPs enabling scaled production of clonal cells and overcoming quality control issues, we propose that our hiDPs can become a preferred autologous therapy for aged and feeble PD patients vulnerable to immunosuppression regimens.

ORGANISM(S): Homo sapiens

PROVIDER: GSE157392 | GEO | 2023/08/31

REPOSITORIES: GEO

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Project description:Induced pluripotent stem cells (iPSCs) hold great promise for in vitro disease modeling and cell replacement therapy for Parkinson’s disease (PD). Both applications crucially require an in-depth profiling of the disease-relevant, iPSC-derived cell type. Midbrain dopaminergic (mDA) neurons derived from pluripotent stem cells are of substantial interest because of their instrumental value for PD therapy. IPSC-derived mDA neuron-like cells have been generated, however, detailed genetic and epigenetic characterization of strictly purified in vitro generated DA neurons has so far lagged behind. We generated mouse Pitx3gfp/+ iPSC-derived DA neurons that, after fluorescent activated cell sorting (FACS) allowed comprehensive comparison to mesodiencephalic dopaminergic (mdDA) neurons from Fac-sorted Pitx3gfp/+ ventral midbrains. We performed detailed analysis of global gene expression and genome-scale DNA methylation of CpG islands (CGIs) by reduced representation bisulfite sequencing. The reprogramming pathway from fibroblasts to iPSCs left parental cell footprints for both gene expression and DNA methylation. However, most gene expression patterns of iPSC-derived DA neurons closely resembled that of primary mdDA neurons with the strongest correlations for mdDA specific genes. Also, for DNA methylation patterns, high similarities were found for the vast majority of CGIs when comparing primary mdDA neurons with iPSC-derived DA neurons. Additionally, we found de novo DNA methylation during in vitro differentiation for hundreds of genes specifically in lineage-committed neural precursors that persisted in iPSC-derived DA neurons. Our study provides novel detailed characteristics of iPSC-derived DA neurons in comparison to the primary cell type. These findings add important information to our knowledge about these biomedically highly valuable, in vitro generated neurons. Microarray expression study comparing 3 samples of facs-sorted, Pitx3-gfp positive cells from each experimental group to a common reference consisting of adult mouse midbrain RNA. Each sample was analysed in normal and opposite dye orientation.

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Direct reprogramming of human fibroblasts to expandable induced dopaminergic neuronal progenitors for Parkinson’s disease therapy [Array]

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