Fibroblast growth factor 2 increases Otx2 expression in precursor cells from mammalian telencephalon

Fibroblast growth factor 2 increases Otx2 expression in precursor cells from mammalian telencephalon
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成纤维细胞生长因子 2 增加哺乳动物端脑前体细胞中 Otx2 的表达

DOI:
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发表时间:
1995
影响因子:
5.3
通讯作者:
F. Vaccarino
F. Vaccarino
中科院分区:
医学1区
文献类型:
--
作者:
L. Robel;M. Ding;AJ James;X. Lin;A. Simeone;J. Leckman;F. Vaccarino

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利用不同发育阶段大鼠端脑分离原代培养物,研究了碱性成纤维细胞生长因子(FGF2)对哺乳动物前脑不同区域表达的三种同源盒基因Otx2、Dlx1和Emx1的影响。胚胎日(E)13.5。Otx1, Otx2, Dlx1, Dlx2, Dlx5和Emx1的区域表达模式在原代培养中保持不变,这表明细胞在这一阶段已经致力于区域身份。在这些培养中,Otx2由前体细胞表达,而Dlx1和Emx1主要由有丝分裂后细胞表达。我们发现FGF2增加了Otx2在前体细胞中的表达和Otx2表达细胞的总数。这种影响是基因特异性的、剂量依赖性的、暂时受调节的,在早期发育阶段的影响更大(E11.5)。在E13.5时,FGF2对Otx2表达的影响仅限于基底端脑。我们的研究结果表明,有限数量的神经母细胞通过增殖和增加Otx2的表达,以暂时调节的方式对FGF2作出反应。FGF2和Otx2之间的相互作用可能对前脑神经发生的调节很重要。
Dissociated primary cultures from rat telencephalon at different developmental stages were used to study the effect of basic fibroblast growth factor (FGF2) on Otx2, Dlx1, and Emx1, three homeobox genes expressed in different regions of the developing mammalian forebrain. At embryonic day (E)13.5. the regional pattern of expression of Otx1, Otx2, Dlx1, Dlx2, Dlx5, and Emx1 is maintained in primary culture, suggesting that cells are already committed to a regional identity at this stage. In these cultures, Otx2 is expressed by precursor cells, whereas Dlx1 and Emx1 are predominantly expressed by postmitotic cells. We found that FGF2 increased Otx2 expression within precursor cells and the total number of Otx2-expressing cells. This effect was gene- specific, dose-dependent, and temporally regulated, with larger effects at earlier stages of development (E11.5). At E13.5, the effect of FGF2 on Otx2 expression was restricted to the basal telencephalon. Our results suggest that a restricted population of neuroblasts respond to FGF2 in a temporally regulated fashion by proliferating and increasing Otx2 expression. This interaction between FGF2 and Otx2 may be important for the regulation of neurogenesis in the forebrain.
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期刊: Development
影响因子: 4.6
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DOI: 10.1016/0169-328x(91)90023-q
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期刊: Brain research. Molecular brain research
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