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Genre/Form: | Thèses et écrits académiques |
---|---|
Material Type: | Document, Thesis/dissertation, Internet resource |
Document Type: | Internet Resource, Computer File |
All Authors / Contributors: |
Céline Barbotin; Alain Eychène; Jonathan Weitzman, professeur de geÌneÌtique).; Heather Etchevers, chercheur en geÌneÌtique).; Charles Durand, membre du jury d'une theÌse de doctorat en Immunologie).; Flavio Maina; Université Sorbonne Paris Cité.; École doctorale Hématologie, oncogenèse et biothérapies (Paris / 2014-....).; Signalisation, radiobiologie et cancer (Orsay, Essonne / 2010-....).; Université Paris Diderot - Paris 7 (1970-2019). |
OCLC Number: | 1226473869 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Céline Barbotin ; sous la direction de Alain Eychène. |
Abstract:
The constitutive activation of the RAS/RAF/MEK/ERK signaling pathway is observed in about 65% of cutaneous melanoma. NRAS and BRAF mutations are found in cells of origin of melanoma which have common characteristics with melanocyte stem cells (MSCs). Despite the large number of study about the role of the RAF/MEK/ERK in melanoma, little is known about its role in the melanocyte lineage in vivo. We generated mice deleted for B-raf and C-raf genes specifically in the melanocyte lineage. These animals displayed normal pigmentation at birth, revealing that raf genes are not required for the development of the melanocyte lineage. However, following the first hair molting, the double knockout animals unveiled a hair graying phenotype, which is characterized by the substitution of black hairs by white ones. This phenotype is the consequence of the depletion of the hair follicles in melanocyte stem cells (MSCs). Therefore, RAF proteins play a key role in the MSCs self-renewal process. We performed a transcriptomic analysis in order to identify target genes of the RAF/MEK/ERK signaling pathway which might be involved in MSCs self-renewal regulation. This analysis showed a downregulation of the transcription of the c-met gene in MSCs from animals lacking raf genes. The c-met gene encodes a tyrosine kinase receptor which is responsible for the RAF/MEK/ERK signaling pathway activation. We demonstrated that MSCs proliferation is controlled via c-MET receptor activation by its ligand HGF. Moreover, MSCs wild-type treated with a c-MET inhibitor are unable to survive in vitro. Taken together, our results show that RAF and MET kinases are required for proper MSCs maintenance.
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