NF-κB-c-REL impairement drives human stem cells into the oligodendroglial fate
Molecular mechanisms underlying fate decisions of human neural stem cells (NSCs) between neurogenesis and gliogenesis are critical during neuronal development and progression of neurodegenerative diseases. Despite its crucial role in murine nervous system development, the potential role of the transcription factor nuclear factor kappa-light-chain-enhancer of activated B-cells (NF-{kappa}B) in fate shifts of human stem cells is poorly understood.\n\nFacing this challenge, we demonstrate here that NF-{kappa}B-c-REL drives glutamatergic differentiation of adult human stem cells, while its impairment results in a shift towards the oligodendroglial fate. We particularly observed an opposing balance switch from NF-{kappa}B-RELB/p52 to NF-{kappa}B-c-REL during early neuronal differentiation of NSCs originating from neural crest-derived stem cells. Exposure of differentiating human NSCs to the c-REL inhibiting approved drug pentoxifylline (PTXF) resulted in elevated levels of cell death and significantly decreased amounts of NF200+/VGLUT2+ neurons. PTXF-mediated inhibition of c-REL further drove human NSCs into the oligodendrocyte fate, as demonstrated by a complete switch to OLIG2+/O4+ oligodendrocytes, which also showed PDGFR, NG2 and MBP transcripts.\n\nIn summary, we present here a novel human cellular model of neuronal differentiation with an essential role of NF-{kappa}B-c-REL in fate choice between neurogenesis and oligodendrogenesis potentially relevant for multiple sclerosis and schizophrenia.