RESUMO
Alzheimer's disease (AD) is most the frequent neurodegenerative disease, and the APOE ε4 allele is the most prominent risk factor for late-onset AD. Here, we present an iPSC line generated from peripheral blood cells of a male AD patient employing Sendai virus vectors encoding the transcription factors OCT4, SOX2, KLF4 and c-MYC. The characterized iPSC line expresses typical human pluripotency markers and shows differentiation into all three germ layers, complete reprogramming vector clearance, a normal SNP genotype and maintenance of the APOE ε4/ε4 allele.
Assuntos
Doença de Alzheimer , Apolipoproteína E4 , Células Sanguíneas , Genótipo , Células-Tronco Pluripotentes Induzidas , Polimorfismo de Nucleotídeo Único , Idoso de 80 Anos ou mais , Doença de Alzheimer/diagnóstico , Doença de Alzheimer/genética , Doença de Alzheimer/metabolismo , Doença de Alzheimer/patologia , Apolipoproteína E4/genética , Apolipoproteína E4/metabolismo , Células Sanguíneas/metabolismo , Células Sanguíneas/patologia , Técnicas de Reprogramação Celular , Humanos , Células-Tronco Pluripotentes Induzidas/metabolismo , Células-Tronco Pluripotentes Induzidas/patologia , Fator 4 Semelhante a Kruppel , Masculino , Fatores de Transcrição/biossíntese , Fatores de Transcrição/genéticaRESUMO
Tight regulation of the balance between self-renewal and differentiation of neural stem cells is crucial to assure proper neural development. In this context, Notch signaling is a well-known promoter of stemness. In contrast, the bifunctional brain-enriched microRNA miR-9/9(∗) has been implicated in promoting neuronal differentiation. Therefore, we set out to explore the role of both regulators in human neural stem cells. We found that miR-9/9(∗) decreases Notch activity by targeting NOTCH2 and HES1, resulting in an enhanced differentiation. Vice versa, expression levels of miR-9/9(∗) depend on the activation status of Notch signaling. While Notch inhibits differentiation of neural stem cells, it also induces miR-9/9(∗) via recruitment of the Notch intracellular domain (NICD)/RBPj transcriptional complex to the miR-9/9(∗)_2 genomic locus. Thus, our data reveal a mutual interaction between bifunctional miR-9/9(∗) and the Notch signaling cascade, calibrating the delicate balance between self-renewal and differentiation of human neural stem cells.