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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2016 ; 291
(22
): 11689-97
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Tumor Suppressor Folliculin Regulates mTORC1 through Primary Cilia
#MMPMID27072130
Zhong M
; Zhao X
; Li J
; Yuan W
; Yan G
; Tong M
; Guo S
; Zhu Y
; Jiang Y
; Liu Y
; Jiang Y
J Biol Chem
2016[May]; 291
(22
): 11689-97
PMID27072130
show ga
Folliculin (FLCN) is the tumor suppressor associated with Birt-Hogg-Dubé (BHD)
syndrome that predisposes patients to incident of hamartomas and cysts in
multiple organs. Its inactivation causes deregulation in the mammalian target of
rapamycin complex 1 (mTORC1) signaling pathway. However, the underlying mechanism
is poorly defined. In this study, we show that FLCN is a ciliary protein that
functions through primary cilia to regulate mTORC1. In response to flow stress,
FLCN associates with LKB1 and recruits the kinase to primary cilia for activation
of AMPK resided at basal bodies, which causes mTORC1 down-regulation. In cells
depleted of FLCN, LKB1 fails to accumulate in primary cilia and AMPK at the basal
bodies remains inactive, thus nullifying the inhibitory effect of flow stress on
mTORC1 activity. Our results demonstrate that FLCN is part of a flow sensory
mechanism that regulates mTORC1 through primary cilia.