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fig6
L'amplification de l'expression de JunB en réponse à la tension membranaire inhibe l'endocytose de BMP2.
Les images montrent BMP2 (a et b) et JunB (c et d) dans une lignée cellulaire myoblastique de souris, C2C12, par microscopie à immunofluorescence. (a) Dix minutes après le début de l'endocytose, la protéine de signalisation BMP2 s'est accumulée dans la cellule. (b) L'augmentation de la tension membranaire induite par choc osmotique bloque l'endocytose de BMP2 et, au bout de 10 minutes, la protéine reste sur la surface de la cellule. (c) Expression dépendante de BMP2 de JunB dans les noyaux cellulaires 30 minutes après incubation des cellules avec BMP2. (d) Augmentation de l'expression de JunB dans les noyaux cellulaires 30 minutes après l'inhibition de l'endocytose par choc osmotique et incubation des cellules avec BMP2. Le fait de bloquer l'endocytose empêche l'internalisation et la dégradation de BMP2 et augmente ainsi la signalisation par le récepteur lié à BMP2 sur la surface cellulaire, stimulant ainsi l'expression de JunB.