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2016 ; 6
(ä): 26557
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FAM83H and casein kinase I regulate the organization of the keratin cytoskeleton
and formation of desmosomes
#MMPMID27222304
Kuga T
; Sasaki M
; Mikami T
; Miake Y
; Adachi J
; Shimizu M
; Saito Y
; Koura M
; Takeda Y
; Matsuda J
; Tomonaga T
; Nakayama Y
Sci Rep
2016[May]; 6
(ä): 26557
PMID27222304
show ga
FAM83H is essential for the formation of dental enamel because a mutation in the
FAM83H gene causes amelogenesis imperfecta (AI). We previously reported that the
overexpression of FAM83H often occurs and disorganizes the keratin cytoskeleton
in colorectal cancer cells. We herein show that FAM83H regulates the organization
of the keratin cytoskeleton and maintains the formation of desmosomes in
ameloblastoma cells. FAM83H is expressed and localized on keratin filaments in
human ameloblastoma cell lines and in mouse ameloblasts and epidermal germinative
cells in vivo. FAM83H shows preferential localization to keratin filaments around
the nucleus that often extend to cell-cell junctions. Alterations in the function
of FAM83H by its overexpression, knockdown, or an AI-causing truncated mutant
prevent the proper organization of the keratin cytoskeleton in ameloblastoma
cells. Furthermore, the AI-causing mutant prevents desmosomal proteins from being
localized to cell-cell junctions. The effects of the AI-causing mutant depend on
its binding to and possible inhibition of casein kinase I (CK-1). The suppression
of CK-1 by its inhibitor, D4476, disorganizes the keratin cytoskeleton. Our
results suggest that AI caused by the FAM83H mutation is mediated by the
disorganization of the keratin cytoskeleton and subsequent disruption of
desmosomes in ameloblasts.