Brief report: combined chemical treatment enables Oct4-induced reprogramming from mouse embryonic fibroblasts

Area of Science:

• Stem Cell Biology
• Epigenetics
• Molecular Biology

Background:

• Exogenous expression of Oct4, Klf4, Sox2, and c-Myc (OKS-M) can induce pluripotency in somatic cells.
• Induced pluripotent stem cells (iPSCs) can be generated using fewer factors, aided by endogenous factors or small molecules.
• Protein arginine methylation's role in reprogramming remains largely unexplored.

Purpose of the Study:

• To identify novel small molecules that can facilitate cellular reprogramming.
• To investigate the potential of AMI-5, a protein arginine methyltransferase inhibitor, in combination with TGF-β inhibition, for reprogramming.
• To assess the pluripotency and developmental potential of Oct4-induced iPSCs generated using this new method.

Main Methods:

• Identification and application of the small molecule AMI-5.
• Combination therapy using AMI-5 and TGF-β inhibitor A-83-01 for Oct4-induced reprogramming of mouse embryonic fibroblasts.
• Assessment of pluripotency markers in generated iPSCs.
• Tetraploid complementation assays to evaluate developmental potential.

Main Results:

• AMI-5, with TGF-β inhibitor A-83-01, successfully induced reprogramming of mouse embryonic fibroblasts using only Oct4.
• The resulting Oct4-induced iPSCs met standard pluripotency criteria, resembling mouse embryonic stem cells.
• Tetraploid complementation assays confirmed the high quality of reprogramming, leading to liveborn pups.

Conclusions:

• A novel small molecule inhibitor of protein arginine methyltransferase, AMI-5, can facilitate Oct4-induced reprogramming when combined with TGF-β inhibition.
• This method generates high-quality iPSCs with full developmental potential, offering an alternative to traditional reprogramming factors.
• Protein arginine methylation is suggested to play a role in the cellular reprogramming process.