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2015 ; 211
(5
): 1057-75
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English Wikipedia
A keratin scaffold regulates epidermal barrier formation, mitochondrial lipid
composition, and activity
#MMPMID26644517
Kumar V
; Bouameur JE
; Bär J
; Rice RH
; Hornig-Do HT
; Roop DR
; Schwarz N
; Brodesser S
; Thiering S
; Leube RE
; Wiesner RJ
; Vijayaraj P
; Brazel CB
; Heller S
; Binder H
; Löffler-Wirth H
; Seibel P
; Magin TM
J Cell Biol
2015[Dec]; 211
(5
): 1057-75
PMID26644517
show ga
Keratin intermediate filaments (KIFs) protect the epidermis against mechanical
force, support strong adhesion, help barrier formation, and regulate growth. The
mechanisms by which type I and II keratins contribute to these functions remain
incompletely understood. Here, we report that mice lacking all type I or type II
keratins display severe barrier defects and fragile skin, leading to perinatal
mortality with full penetrance. Comparative proteomics of cornified envelopes
(CEs) from prenatal KtyI(-/-) and KtyII(-/-)(K8) mice demonstrates that absence
of KIF causes dysregulation of many CE constituents, including downregulation of
desmoglein 1. Despite persistence of loricrin expression and upregulation of many
Nrf2 targets, including CE components Sprr2d and Sprr2h, extensive barrier
defects persist, identifying keratins as essential CE scaffolds. Furthermore, we
show that KIFs control mitochondrial lipid composition and activity in a
cell-intrinsic manner. Therefore, our study explains the complexity of
keratinopathies accompanied by barrier disorders by linking keratin scaffolds to
mitochondria, adhesion, and CE formation.