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2016 ; 15
(8
): 1615-23
Nephropedia Template TP
gab.com Text
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English Wikipedia
PDK1 Is a Regulator of Epidermal Differentiation that Activates and Organizes
Asymmetric Cell Division
#MMPMID27184845
Dainichi T
; Hayden MS
; Park SG
; Oh H
; Seeley JJ
; Grinberg-Bleyer Y
; Beck KM
; Miyachi Y
; Kabashima K
; Hashimoto T
; Ghosh S
Cell Rep
2016[May]; 15
(8
): 1615-23
PMID27184845
show ga
Asymmetric cell division (ACD) in a perpendicular orientation promotes cell
differentiation and organizes the stratified epithelium. However, the upstream
cues regulating ACD have not been identified. Here, we report that
phosphoinositide-dependent kinase 1 (PDK1) plays a critical role in establishing
ACD in the epithelium. Production of phosphatidyl inositol triphosphate (PIP3) is
localized to the apical side of basal cells. Asymmetric recruitment of atypical
protein kinase C (aPKC) and partitioning defective (PAR) 3 is impaired in PDK1
conditional knockout (CKO) epidermis. PDK1(CKO) keratinocytes do not undergo
calcium-induced activation of aPKC or IGF1-induced activation of AKT and fail to
differentiate. PDK1(CKO) epidermis shows decreased expression of Notch, a
downstream effector of ACD, and restoration of Notch rescues defective expression
of differentiation-induced Notch targets in vitro. We therefore propose that PDK1
signaling regulates the basal-to-suprabasal switch in developing epidermis by
acting as both an activator and organizer of ACD and the Notch-dependent
differentiation program.
|*Asymmetric Cell Division
[MESH]
|*Cell Differentiation
[MESH]
|*Epidermal Cells
[MESH]
|3-Phosphoinositide-Dependent Protein Kinases/*metabolism
[MESH]