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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 Nat+Commun
2015 ; 6
(ä): 6496
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Defective podocyte insulin signalling through p85-XBP1 promotes ATF6-dependent
maladaptive ER-stress response in diabetic nephropathy
#MMPMID25754093
Madhusudhan T
; Wang H
; Dong W
; Ghosh S
; Bock F
; Thangapandi VR
; Ranjan S
; Wolter J
; Kohli S
; Shahzad K
; Heidel F
; Krueger M
; Schwenger V
; Moeller MJ
; Kalinski T
; Reiser J
; Chavakis T
; Isermann B
Nat Commun
2015[Mar]; 6
(ä): 6496
PMID25754093
show ga
Endoplasmic reticulum (ER) stress is associated with diabetic nephropathy (DN),
but its pathophysiological relevance and the mechanisms that compromise adaptive
ER signalling in podocytes remain unknown. Here we show that nuclear
translocation of the transcription factor spliced X-box binding protein-1 (sXBP1)
is selectively impaired in DN, inducing activating transcription factor-6 (ATF6)
and C/EBP homology protein (CHOP). Podocyte-specific genetic ablation of XBP1 or
inducible expression of ATF6 in mice aggravates DN. sXBP1 lies downstream of
insulin signalling and attenuating podocyte insulin signalling by genetic
ablation of the insulin receptor or the regulatory subunits phosphatidylinositol
3-kinase (PI3K) p85? or p85? impairs sXBP1 nuclear translocation and exacerbates
DN. Corroborating our findings from murine DN, the interaction of sXBP1 with p85?
and p85? is markedly impaired in the glomerular compartment of human DN. Thus,
signalling via the insulin receptor, p85, and XBP1 maintains podocyte
homeostasis, while disruption of this pathway impairs podocyte function in DN.