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• W2135572018 abstract "Neurotrophic factors control a range of activities in developing neurons, including survival, proliferation, migration and neuronal differentiation. Two classes of neurotrophic factors that are strongly linked to neuronal development of the peripheral nervous system are the neurotrophins and GDNF family ligands. Like other trophic factors they act by triggering signalling through receptor tyrosine kinases. This thesis addresses novel functions for the receptor of GDNF family ligands in peripheral nervous system development and how specificity is achieved at different levels of the trophic factor signalling pathway. In paper I, NT3, which has been considered to be a promiscuous neurotrophin, is demonstrated to only signal through the TrkC receptor, despite the presence of TrkB. In genetically modified mice, NT3/TrkC, but not NT3/TrkB, could promote survival in the majority of cochleovestibular neurons. Furthermore, NT3/TrkC could not substitute for BDNF/TrkB in final target innervation of the vestibular system of the inner ear. In paper II and III, Ret, the receptor for GDNF family ligands, is shown to require the binding of the adaptor protein Frs2 to its phosphorylated tyrosine 1062 for migration. In addition, phosphorylated tyrosine 981 was also necessary for a full migratory response, showing cooperation between these tyrosines. Moreover, the subcellular localization of Ret was dependent on which adaptor that binds to tyrosine 1062, highlighting a new function for adaptor proteins. In paper IV we have ablated Ret in a subpopulation of nociceptive neurons in vivo. We show that Ret was important for the proper expression of ion channels and G protein-coupled receptors. The loss of Ret also led to behavioural changes when mechanical and hot stimuli were applied to the genetically modified mice. This demonstrates the necessity of Ret for normal development of mechanoand thermosensation. In conclusion this thesis contributes to the elucidation of how specificity in neurotrophic factor signalling is achieved and the definition of new roles for neurotrophic factors in development. LIST OF PUBLICATIONS I. Stenqvist A , Agerman K , Marmigere F, Minichiello L, Ernfors P. * * Genetic evidence for selective neurotrophin 3 signalling through TrkC but not TrkB in vivo. EMBO Rep. 2005 Oct;6(10):973-8. II. Lundgren TK, Stenqvist A, Scott RP, Pawson T, Ernfors P. Cell migration by a FRS2-adaptor dependent membrane relocation of Ret receptors. J Cell Biochem. 2008 Jan 11; [Epub ahead of print] III. Stenqvist A, Lundgren TK, Smith MJ, Pawson T, Ernfors P. Subcellular receptor redistribution and enhanced microspike formation by a Ret receptor preferentially recruiting Dok. Submitted IV. Stenqvist A, Li L, Hao J, Usoskin D, Wiesenfeld-Hallin Z, Sariola H, Xu X, Ernfors P. Functional implications of Ret deficiency for mechanoand thermosensation. Submitted *shared first authorship" @default.
• W2135572018 created "2016-06-24" @default.
• W2135572018 creator A5001841426 @default.
• W2135572018 date "2008-02-01" @default.
• W2135572018 modified "2023-09-26" @default.
• W2135572018 title "Neurotrophic factors in peripheral nervous system development : Function and specificity" @default.
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