title: Effects on differentiation of embryonic ventral midbrain progenitors by Lmx1a, Msx1, Ngn2, and Pitx3.
abstract: Neurons derived from neural stem cells could potentially be used for cell therapy in neurodegenerative disorders, such as Parkinson's disease. To achieve controlled differentiation of neural stem cells, we expressed transcription factors involved in the development of midbrain dopaminergic neurons in rat and human neural progenitors. Using retroviral-mediated transgene delivery, we overexpressed Lmx1a (LIM homeobox transcription factor 1, alpha), Msx1 (msh homeobox homolog 1), Ngn2 (neurogenin 2), or Pitx3 (paired-like homeodomain transcription factor 3) in neurospheres derived from embryonic day 14.5 rat ventral mesencephalic progenitors. We also expressed either Lmx1a or Msx1 in the human embryonic midbrain-derived progenitor cell line NGC-407. Rat cells transduced with Ngn2 exited the cell cycle and expressed the neuronal marker microtubule-associated protein 2 and catecholamine-neuron protein vesicular monoamine transporter 2. Interestingly, Pitx3 downregulated the expression of SOX2 (SRY-box containing gene 2) and Nestin, altered cell morphology, but never induced neuronal or glial differentiation. Ngn2 exhibited a strong neuron-inducing effect. In contrast, few Lmx1a-transduced cells matured into neurons, and Msx1 overexpression promoted oligodendrogenesis rather than neuronal differentiation. Importantly, none of these four genes, alone or in combination, enhanced differentiation of rat neural stem cells into dopaminergic neurons. Notably, the overexpression of Lmx1a, but not Msx1, in human neural progenitors increased the yield of tyrosine hydroxylase-immunoreactive cells by threefold. Together, we demonstrate that induced overexpression of transcription factor genes has profound and specific effects on the differentiation of rat and human midbrain progenitors, although few dopamine neurons are generated.
authors.affiliation: Neuronal Survival Unit, Department of Experimental Medical Science, 221 84 Lund, Sweden. laurent.roybon@med.lu.se
authors.forename: Laurent
authors.initials: L
authors.lastname: Roybon
authors.forename: Tord
authors.initials: T
authors.lastname: Hjalt
authors.forename: Nicolaj S
authors.initials: NS
authors.lastname: Christophersen
authors.forename: Jia-Yi
authors.initials: JY
authors.lastname: Li
authors.forename: Patrik
authors.initials: P
authors.lastname: Brundin
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D002454:Cell Differentiation / Q000502:physiology*; D002478:Cells, Cultured; D004298:Dopamine / Q000378:metabolism; D004622:Embryo, Mammalian; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D018014:Gene Transfer Techniques; D005822:Genetic Vectors / Q000502:physiology; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D060850:LIM-Homeodomain Proteins; D051957:MSX1 Transcription Factor / Q000235:genetics / Q000378:metabolism; D008636:Mesencephalon / Q000166:cytology* / Q000196:embryology; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism; D009474:Neurons / Q000502:physiology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013234:Stem Cells / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D014446:Tyrosine 3-Monooxygenase
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D004298:Dopamine; D018398:Homeodomain Proteins; D060850:LIM-Homeodomain Proteins; D051957:MSX1 Transcription Factor; D009419:Nerve Tissue Proteins; D014157:Transcription Factors; D014446:Tyrosine 3-Monooxygenase; C078021:LMX1A protein, human; C497998:Msx1 protein, rat; C491183:NEUROG2 protein, human; C433629:homeobox protein PITX3