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

L Robel, M Ding, AJ James, X Lin, A Simeone, JF Leckman and FM Vaccarino
Journal of Neuroscience 1 December 1995, 15 (12) 7879-7891; DOI: https://doi.org/10.1523/JNEUROSCI.15-12-07879.1995
L Robel
Child Study Center, Yale University, New Haven, Connecticut 06520, USA.
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M Ding
Child Study Center, Yale University, New Haven, Connecticut 06520, USA.
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AJ James
Child Study Center, Yale University, New Haven, Connecticut 06520, USA.
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X Lin
Child Study Center, Yale University, New Haven, Connecticut 06520, USA.
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A Simeone
Child Study Center, Yale University, New Haven, Connecticut 06520, USA.
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JF Leckman
Child Study Center, Yale University, New Haven, Connecticut 06520, USA.
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FM Vaccarino
Child Study Center, Yale University, New Haven, Connecticut 06520, USA.
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Abstract

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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The Journal of Neuroscience: 15 (12)
Journal of Neuroscience
Vol. 15, Issue 12
1 Dec 1995
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Fibroblast growth factor 2 increases Otx2 expression in precursor cells from mammalian telencephalon
L Robel, M Ding, AJ James, X Lin, A Simeone, JF Leckman, FM Vaccarino
Journal of Neuroscience 1 December 1995, 15 (12) 7879-7891; DOI: 10.1523/JNEUROSCI.15-12-07879.1995

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Fibroblast growth factor 2 increases Otx2 expression in precursor cells from mammalian telencephalon
L Robel, M Ding, AJ James, X Lin, A Simeone, JF Leckman, FM Vaccarino
Journal of Neuroscience 1 December 1995, 15 (12) 7879-7891; DOI: 10.1523/JNEUROSCI.15-12-07879.1995
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