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2017 ; 12
(7
): e0180853
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Inflammation dependent mTORC1 signaling interferes with the switch from
keratinocyte proliferation to differentiation
#MMPMID28700632
Buerger C
; Shirsath N
; Lang V
; Berard A
; Diehl S
; Kaufmann R
; Boehncke WH
; Wolf P
PLoS One
2017[]; 12
(7
): e0180853
PMID28700632
show ga
Psoriasis is a frequent and often severe inflammatory skin disease, characterized
by altered epidermal homeostasis. Since we found previously that Akt/mTOR
signaling is hyperactivated in psoriatic skin, we aimed at elucidating the role
of aberrant mTORC1 signaling in this disease. We found that under healthy
conditions mTOR signaling was shut off when keratinocytes switch from
proliferation to terminal differentiation. Inflammatory cytokines (IL-1?, IL-17A,
TNF-?) induced aberrant mTOR activity which led to enhanced proliferation and
reduced expression of differentiation markers. Conversely, regular
differentiation could be restored if mTORC1 signaling was blocked. In mice,
activation of mTOR through the agonist MHY1485 also led to aberrant epidermal
organization and involucrin distribution. In summary, these results not only
identify mTORC1 as an important signal integrator pivotal for the cells fate to
either proliferate or differentiate, but emphasize the role of
inflammation-dependent mTOR activation as a psoriatic pathomechanism.