LAMTOR2 regulates dendritic cell homeostasis through FLT3-dependent mTOR signalling

Julia M. Scheffler, Florian Sparber, Christoph H. Tripp, Caroline Herrmann, Alexandra Humenberger, Johanna Blitz, Nikolaus Romani, Patrizia Stoitzner and Lukas A. Huber ()
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Julia M. Scheffler: Biocenter, Innsbruck Medical University, Innrain 80-82
Florian Sparber: Innsbruck Medical University
Christoph H. Tripp: Innsbruck Medical University
Caroline Herrmann: Biocenter, Innsbruck Medical University, Innrain 80-82
Alexandra Humenberger: Austrian Drug Screening Institute (ADSI)
Johanna Blitz: Biocenter, Innsbruck Medical University, Innrain 80-82
Nikolaus Romani: Innsbruck Medical University
Patrizia Stoitzner: Innsbruck Medical University
Lukas A. Huber: Biocenter, Innsbruck Medical University, Innrain 80-82

Nature Communications, 2014, vol. 5, issue 1, 1-14

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6138

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