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2015 ; 112
(13
): E1624-31
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Folliculin-interacting proteins Fnip1 and Fnip2 play critical roles in kidney
tumor suppression in cooperation with Flcn
#MMPMID25775561
Hasumi H
; Baba M
; Hasumi Y
; Lang M
; Huang Y
; Oh HF
; Matsuo M
; Merino MJ
; Yao M
; Ito Y
; Furuya M
; Iribe Y
; Kodama T
; Southon E
; Tessarollo L
; Nagashima K
; Haines DC
; Linehan WM
; Schmidt LS
Proc Natl Acad Sci U S A
2015[Mar]; 112
(13
): E1624-31
PMID25775561
show ga
Folliculin (FLCN)-interacting proteins 1 and 2 (FNIP1, FNIP2) are homologous
binding partners of FLCN, a tumor suppressor for kidney cancer. Recent studies
have revealed potential functions for Flcn in kidney; however, kidney-specific
functions for Fnip1 and Fnip2 are unknown. Here we demonstrate that Fnip1 and
Fnip2 play critical roles in kidney tumor suppression in cooperation with Flcn.
We observed no detectable phenotype in Fnip2 knockout mice, whereas Fnip1
deficiency produced phenotypes similar to those seen in Flcn-deficient mice in
multiple organs, but not in kidneys. We found that absolute Fnip2 mRNA copy
number was low relative to Fnip1 in organs that showed phenotypes under Fnip1
deficiency but was comparable to Fnip1 mRNA copy number in mouse kidney.
Strikingly, kidney-targeted Fnip1/Fnip2 double inactivation produced enlarged
polycystic kidneys, as was previously reported in Flcn-deficient kidneys.
Kidney-specific Flcn inactivation did not further augment kidney size or cystic
histology of Fnip1/Fnip2 double-deficient kidneys, suggesting pathways
dysregulated in Flcn-deficient kidneys and Fnip1/Fnip2 double-deficient kidneys
are convergent. Heterozygous Fnip1/homozygous Fnip2 double-knockout mice
developed kidney cancer at 24 mo of age, analogous to the heterozygous Flcn
knockout mouse model, further supporting the concept that Fnip1 and Fnip2 are
essential for the tumor-suppressive function of Flcn and that kidney
tumorigenesis in human Birt-Hogg-Dubé syndrome may be triggered by loss of
interactions among Flcn, Fnip1, and Fnip2. Our findings uncover important roles
for Fnip1 and Fnip2 in kidney tumor suppression and may provide molecular targets
for the development of novel therapeutics for kidney cancer.