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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 Dev+Cell
2014 ; 28
(6
): 647-58
Nephropedia Template TP
gab.com Text
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English Wikipedia
PI3K class II ? controls spatially restricted endosomal PtdIns3P and Rab11
activation to promote primary cilium function
#MMPMID24697898
Franco I
; Gulluni F
; Campa CC
; Costa C
; Margaria JP
; Ciraolo E
; Martini M
; Monteyne D
; De Luca E
; Germena G
; Posor Y
; Maffucci T
; Marengo S
; Haucke V
; Falasca M
; Perez-Morga D
; Boletta A
; Merlo GR
; Hirsch E
Dev Cell
2014[Mar]; 28
(6
): 647-58
PMID24697898
show ga
Multiple phosphatidylinositol (PtdIns) 3-kinases (PI3Ks) can produce PtdIns3P to
control endocytic trafficking, but whether enzyme specialization occurs in
defined subcellular locations is unclear. Here, we report that PI3K-C2? is
enriched in the pericentriolar recycling endocytic compartment (PRE) at the base
of the primary cilium, where it regulates production of a specific pool of
PtdIns3P. Loss of PI3K-C2?-derived PtdIns3P leads to mislocalization of PRE
markers such as TfR and Rab11, reduces Rab11 activation, and blocks accumulation
of Rab8 at the primary cilium. These changes in turn cause defects in primary
cilium elongation, Smo ciliary translocation, and Sonic Hedgehog (Shh) signaling
and ultimately impair embryonic development. Selective reconstitution of PtdIns3P
levels in cells lacking PI3K-C2? rescues Rab11 activation, primary cilium length,
and Shh pathway induction. Thus, PI3K-C2? regulates the formation of a PtdIns3P
pool at the PRE required for Rab11 and Shh pathway activation.