Neural stem cells derived from epiblast stem cells display distinctive properties

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Neuroscience

Background:

• Pluripotent stem cells exist in naive (embryonic stem cells, ESCs) and primed (epiblast stem cells, EpiSCs) states, differing in pluripotency.
• EpiSCs are considered less pluripotent than ESCs, with distinct phenotypes and gene expression patterns.
• The differentiation potential of EpiSCs into specialized cell types, particularly neural stem cells (NSCs), requires further investigation.

Purpose of the Study:

• To investigate whether primed pluripotent EpiSCs can be efficiently differentiated into specialized cell types in vitro.
• To characterize the neural stem cell properties and differentiation potential of EpiSC-derived NSCs.
• To compare the gene expression profiles of NSCs derived from EpiSCs, ESCs, and brain tissue.

Main Methods:

• Derivation of EpiSCs from Oct4-GFP mouse embryos (E5.5-6.5).
• In vitro and in vivo differentiation assays for EpiSCs and derived NSCs.
• Characterization of EpiSC-derived NSCs using marker expression, self-renewal capacity, and differentiation potential.
• Global gene expression profiling (RNA sequencing) of NSCs from different origins.

Main Results:

• EpiSCs expressed pluripotency markers and differentiated into all three germ layers.
• EpiSCs efficiently generated a homogenous population of functional neural stem cells (NSCs) in vitro.
• EpiSC-derived NSCs (EpiSC-NSCs) expressed NSC markers, self-renewed extensively, and differentiated into neurons and glial cells.
• Transplantation of EpiSC-NSCs into neonatal mouse brains confirmed their survival and differentiation into functional neural cells.
• Global gene expression analysis revealed distinct clustering for developmental process-related genes between EpiSC-NSCs and ESC-derived NSCs/brain NSCs, despite similar pluripotency and NSC marker expression.

Conclusions:

• Primed pluripotent EpiSCs efficiently differentiate into functional neural stem cells in vitro and in vivo.
• While EpiSC-derived NSCs exhibit comparable differentiation properties to ESC-derived NSCs, their global gene expression profiles differ, reflecting their origin from naive versus primed pluripotent states.
• These findings highlight the plasticity of primed pluripotent stem cells and offer insights into the developmental pathways influencing neural stem cell identity.