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• W2885155934 abstract "The development of the sensory nervous system is the result of fine-tuned waves of neurogenesis and apoptosis which control the appropriate number of precursors and newly generated neurons and orient them toward a specific lineage. Neurotrophins and their tyrosine-kinase receptors (RTK) orchestrate this process. They have long been in the scope of the neurotrophic theory which established that a neuron is committed to die unless a trophic factor generated by its target provides it with a survival signal. The neural death has thus always been described as a default program, survival being the major player to control the number of cells. New insights have been brought by the gain of function studies which recently demonstrated that TrkC (NTRK3) is a dependence receptor able to actively trigger apoptosis in absence of its ligand NT-3. In order to address the role of TrkC pro-apoptotic activity in the control of sensory neurons number, we generated a TrkC gene-trap mutant mice. We found out that this new murine model recapitulates the sensory phenotype of TrkC constitutive mutants, with reduced DRG size and reduced number of DRG neurons. We engineered these mice strain with a lacZ reporter in order to follow the fate of neurons committed to a TrkC lineage and observed that they are specifically protected from NT-3 mediated apoptosis in NT-3/TrkC double knock-out embryos. Finally, using a chicken model we demonstrated that silencing NT-3 emanating from the ventral neural tube induced apoptosis in the DRG anlage. This apoptosis was inhibited by silencing TrkC. This work thus demonstrates that, during in vivo DRG development, TrkC behaves as a two-sided receptor transducing positive signals of neuronal survival in response to NT-3, but actively inducing neuronal cell death when unbound. This functional duality sets adequate number of neurons committed to a TrkC identity in the forming DRG." @default.
• W2885155934 created "2018-08-22" @default.
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• W2885155934 date "2018-10-01" @default.
• W2885155934 modified "2023-10-12" @default.
• W2885155934 title "The dependence receptor TrkC regulates the number of sensory neurons during DRG development" @default.
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• W2885155934 doi "https://doi.org/10.1016/j.ydbio.2018.07.022" @default.
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