Efficient Differentiation of Human Embryonic Stem Cells Toward Dopaminergic Neurons Using Recombinant LMX1A Factor
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Direct differentiation of dopaminergic (DA) neurons from human pluripotent stem cells (hPSCs) in the absence of gene manipulation is the most desired alternative to clinical treatment of Parkinson disease. Protein transduction-based methods could be efficient, safe approaches to enhance direct differentiation of human embryonic stem cells (hESCs) to DA neurons. In the present study, we compared the differentiation efficiency of DA neurons from hESCs with and without the application of LIM homeobox transcription factor 1 alpha (LMX1A), a master regulatory protein in the development of the midbrain neurons and SHH proteins. The results obtained revealed that the treatment of hESCs with recombinant LMX1A (rLMX1A) protein along with dual SMAD inhibition led to higher expression of LMX1B, LMX1A, FOXA2, PITX3, EN1, and WNT1 effector endogenous genes and two-fold expression of PITX3. Moreover, the highest expression level of PITX3 and TH was observed when rLMX1A was added to the induction medium supplemented with SHH. To our best knowledge, this is the first report demonstrating the application of TAT-LMX1A recombinant protein to enhance hESC differentiation to DA as shown by the expression of DA specific makers. These findings pave the way for enhancing the differentiation of hESCs to DA neurons safely and efficiently without genetic modification.
KeywordsDopaminergic neuron Differentiation Protein transduction LMX1A
Human embryonic stem cell
Trans-activator of transcription
This study was funded through the grants provided by Royan Institute (#90000499). We are grateful to the members of the Department of Stem Cells and Developmental Biology, Royan Institure, for their critical comments.
Conflict of interest
The authors declare they have no competing financial interests.
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