Generation of ERK-Independent Human and Non-Human Primate Pluripotent Stem Cells

Area of Science:

• Stem cell biology
• Developmental biology
• Regenerative medicine

Background:

• Generating patient-specific organs using human-animal chimeras requires chimera-competent human pluripotent stem (PS) cells.
• Previous research indicated that blocking ERK, WNT, and PKC signaling is vital for deriving ERK-independent PS cells in non-human primates.

Purpose of the Study:

• To investigate if the principle of deriving ERK-independent PS cells is applicable to human cells.
• To establish methods for generating human PS cells suitable for interspecies chimera applications.

Main Methods:

• Human PS cells were reset to ERK-independence using histone deacetylase inhibitors and a specialized PGCX medium.
• The PGCX medium included N2B27, LIF, PD0325901, Go6983, CHIR99021, and XAV939.
• Characterization of the resulting stem cells involved assessing KLF4 levels and mitochondrial membrane potential.

Main Results:

• A method was successfully developed to reset conventional human PS cells to an ERK-independent state.
• The resulting novel stem cells showed elevated KLF4 expression and increased mitochondrial membrane depolarization.
• Not all human PS cell lines responded to the small molecule-mediated resetting process.

Conclusions:

• The developed ERK-independent human PS cells are a valuable resource for studying interspecies organogenesis.
• This advancement supports the potential of using human-animal chimeras for generating patient-specific organs.
• Further research is needed to optimize the resetting process for broader applicability across different PS cell lines.