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LAMTOR2 regulates dendritic cell homeostasis through FLT3-dependent mTOR signalling.

ABSTRACT: The receptor tyrosine kinase Flt3 and its ligand are crucial for dendritic cell (DC) homeostasis by activating downstream effectors including mammalian target of Rapamycin (mTOR) signalling. LAMTOR2 is a member of the Ragulator/LAMTOR complex known to regulate mTOR and extracellular signal-regulated kinase activation on the late endosome as well as endosomal biogenesis. Here we show in mice that conditional ablation of LAMTOR2 in DCs results in a severe disturbance of the DC compartment caused by accumulation of Flt3 on the cell surface. This results in an increased downstream activation of the AKT/mTOR signalling pathway and subsequently to a massive expansion of conventional DCs and plasmacytoid DCs in ageing mice. Finally, we can revert the symptoms in vivo by inhibiting the activation of Flt3 and its downstream target mTOR.

SUBMITTER: Scheffler JM

PROVIDER: S-EPMC4220488 | biostudies-literature | 2014 Oct

REPOSITORIES: biostudies-literature

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LAMTOR2 regulates dendritic cell homeostasis through FLT3-dependent mTOR signalling.

Scheffler Julia M JM Sparber Florian F Tripp Christoph H CH Herrmann Caroline C Humenberger Alexandra A Blitz Johanna J Romani Nikolaus N Stoitzner Patrizia P Huber Lukas A LA

Nature communications 20141022

The receptor tyrosine kinase Flt3 and its ligand are crucial for dendritic cell (DC) homeostasis by activating downstream effectors including mammalian target of Rapamycin (mTOR) signalling. LAMTOR2 is a member of the Ragulator/LAMTOR complex known to regulate mTOR and extracellular signal-regulated kinase activation on the late endosome as well as endosomal biogenesis. Here we show in mice that conditional ablation of LAMTOR2 in DCs results in a severe disturbance of the DC compartment caused b ...[more]

PMID: 25336251

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