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• W1981154110 endingPage "e18373" @default.
• W1981154110 startingPage "e18373" @default.
• W1981154110 abstract "During development, precise temporal and spatial gradients are responsible for guiding axons to their appropriate targets. Within the developing ventral midbrain (VM) the cues that guide dopaminergic (DA) axons to their forebrain targets remain to be fully elucidated. Wnts are morphogens that have been identified as axon guidance molecules. Several Wnts are expressed in the VM where they regulate the birth of DA neurons. Here, we describe that a precise temporo-spatial expression of Wnt5a accompanies the development of nigrostriatal projections by VM DA neurons. In mice at E11.5, Wnt5a is expressed in the VM where it was found to promote DA neurite and axonal growth in VM primary cultures. By E14.5, when DA axons are approaching their striatal target, Wnt5a causes DA neurite retraction in primary cultures. Co-culture of VM explants with Wnt5a-overexpressing cell aggregates revealed that Wnt5a is capable of repelling DA neurites. Antagonism experiments revealed that the effects of Wnt5a are mediated by the Frizzled receptors and by the small GTPase, Rac1 (a component of the non-canonical Wnt planar cell polarity pathway). Moreover, the effects were specific as they could be blocked by Wnt5a antibody, sFRPs and RYK-Fc. The importance of Wnt5a in DA axon morphogenesis was further verified in Wnt5a−/− mice, where fasciculation of the medial forebrain bundle (MFB) as well as the density of DA neurites in the MFB and striatal terminals were disrupted. Thus, our results identify a novel role of Wnt5a in DA axon growth and guidance." @default.
• W1981154110 created "2016-06-24" @default.
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• W1981154110 date "2011-03-31" @default.
• W1981154110 modified "2023-10-17" @default.
• W1981154110 title "Wnt5a Regulates Midbrain Dopaminergic Axon Growth and Guidance" @default.
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• W1981154110 doi "https://doi.org/10.1371/journal.pone.0018373" @default.
• W1981154110 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3069098" @default.
• W1981154110 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21483795" @default.
• W1981154110 hasPublicationYear "2011" @default.
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