Polarizing activity and retinoid synthesis in the floor plate of the neural tube
Polarizing activity and retinoid synthesis in the floor plate of the neural tube
复制标题
神经管底板的极化活动和类维生素A合成
作者:
M. Wagner;C. Thaller;T. Jessell;G. Eichele
IN many developing organisms the establishment of axial polarity and the patterning of cells depend on local signals that derive from restricted regions of the embryo1–2. In vertebrate embryos, the origins of tissue polarity have been examined extensively in the developing limb3–5. The anteroposterior pattern of the chick limb seems to be controlled by a morphogen, possibly retinoic acid, that is enriched in a region of the limb known as the zone of polarizing activity (ZPA)6–11. Certain tissues other than the ZPA have also shown polarizing activity experimentally in the chick limb12–14, raising the possibility that signalling molecules involved in pattern formation in different embryonic tissues are conserved. Here we provide evidence that a similar polarizing activity is also present in a restricted region of the developing central nervous system (CNS). We show that a specialized group of neural cells termed the floor plate15, but not other regions of the CNS, mimics the ZPA in respecifying the digit pattern in the developing chick limb. In addition, using an in vitro biochemical assay, we show that the floor plate can synthesize retinoic acid and 3,4-didehydroretinol, the precursor of a second morphogenetically active retinoid, 3,4-didehydroretinoic acid16. These results show that the floor plate is a local source of a ZPA-like polarizing signal, possibly a retinoid, which may regulate the pattern of cell differentiation in the developing CNS.
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DOI:
10.1002/jez.1402500107
发表时间:
1989
期刊:
The Journal of experimental zoology
影响因子:
--
作者:
Smith,JL;Schoenwolf,GC
通讯作者:
Schoenwolf,GC
DOI:
--
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Napoli,JL
通讯作者:
Napoli,JL
DOI:
10.1002/jez.1402490305
发表时间:
1989
期刊:
The Journal of experimental zoology
影响因子:
--
作者:
Schoenwolf,GC;Bortier,H;Vakaet,L
通讯作者:
Vakaet,L
DOI:
10.1016/0168-9525(89)90096-6
发表时间:
1989
期刊:
Trends in genetics : TIG
影响因子:
--
作者:
Eichele,G
通讯作者:
Eichele,G
DOI:
10.1242/dev.103.3.473
发表时间:
1988
期刊:
Development (Cambridge, England)
影响因子:
--
作者:
Thaller,C;Eichele,G
通讯作者:
Eichele,G