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Dynamic temporal and cell type-specific expression of Wnt signaling components in the developing midbrain.

Abstract：

:Wnt1 and -5a have been shown to modulate the proliferation and differentiation of midbrain dopaminergic (DA) neurons. However, it is not known whether other Wnts or which Frizzled (Fz) receptors are expressed in the developing midbrain. We found that 13 out of 19 Wnts, all 10 Fzs, and several intracellular Wnt signaling modulators, including Axin, FRAT, Naked, Par-1, and Ltap are developmentally regulated between embryonic days (E) 10.5 and 15.5. Next, we studied whether Fzs are differentially expressed in different cell types and examined neuronal-progenitor- or glial-enriched cultures and DA neurons isolated from TH-GFP reporter mice. We found that Fz8 is expressed at high levels in DA neurons at E11.5 and E13.5. Fz6 and -7 are the predominant transcripts in glial precursors, and Fz9, which is absent in DA neurons at E11.5, is the main receptor expressed in neuronal precursors. We therefore examined the function of Fz9 in DA cells and found that overexpression of Fz9 reduced Wnt5a- but not Wnt3a-induced hyperphosphorylation of Dishevelled. Thus, our results show that Fzs are developmentally regulated and differentially expressed in VM precursors, DA neurons, and glia. These findings suggest that Fz expression contributes to provide specificity to Wnt-mediated effects.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Rawal N,Castelo-Branco G,Sousa KM,Kele J,Kobayashi K,Okano H,Arenas E

doi

10.1016/j.yexcr.2006.01.032

keywords:

subject

Has Abstract

pub_date

2006-05-15 00:00:00

pages

1626-36

issue

9

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(06)00035-8

journal_volume

312

pub_type

杂志文章

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