Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Efficient Generation of Dopaminergic Neurons from Mouse Ventral Midbrain Astrocytes

  • Jin Yi Han (Graduate School of Biomedical Science and Engineering, Hanyang University) ;
  • Eun-Hye Lee (Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine) ;
  • Sang-Mi Kim (Hanyang Biomedical Research Institute, Hanyang University) ;
  • Chang-Hwan Park (Graduate School of Biomedical Science and Engineering, Hanyang University)
  • Received : 2022.11.05
  • Accepted : 2022.12.13
  • Published : 2023.05.01
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Abstract

Parkinson's disease (PD) is a common neurodegenerative disorder characterized by tremors, bradykinesia, and rigidity. PD is caused by loss of dopaminergic (DA) neurons in the midbrain substantia nigra (SN) and therefore, replenishment of DA neurons via stem cell-based therapy is a potential treatment option. Astrocytes are the most abundant non-neuronal cells in the central nervous system and are promising candidates for reprogramming into neuronal cells because they share a common origin with neurons. The ability of neural progenitor cells (NPCs) to proliferate and differentiate may overcome the limitations of the reduced viability and function of transplanted cells after cell replacement therapy. Achaete-scute complex homolog-like 1 (Ascl1) is a well-known neuronal-specific factor that induces various cell types such as human and mouse astrocytes and fibroblasts to differentiate into neurons. Nurr1 is involved in the differentiation and maintenance of DA neurons, and decreased Nurr1 expression is known to be a major risk factor for PD. Previous studies have shown that direct conversion of astrocytes into DA neurons and NPCs can be induced by overexpression of Ascl1 and Nurr1 and additional transcription factors genes such as superoxide dismutase 1 and SRY-box 2. Here, we demonstrate that astrocytes isolated from the ventral midbrain, the origin of SN DA neurons, can be effectively converted into DA neurons and NPCs with enhanced viability. In addition, when these NPCs are inducted to differentiate, they exhibit key characteristics of DA neurons. Thus, direct conversion of midbrain astrocytes is a possible cell therapy strategy to treat neurodegenerative diseases.

Keywords

Acknowledgement

This research was supported by a grant from the Individual Basic Science and Engineering Research Program (2019R1A2C2005681) of the National Research Foundation funded by the Ministry of Science and ICT in Korea.

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