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2015 ; 19
(9
): 2273-85
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Apelin promotes diabetic nephropathy by inducing podocyte dysfunction via
inhibiting proteasome activities
#MMPMID26103809
Guo C
; Liu Y
; Zhao W
; Wei S
; Zhang X
; Wang W
; Zeng X
J Cell Mol Med
2015[Sep]; 19
(9
): 2273-85
PMID26103809
show ga
Podocyte injuries are associated with progression of diabetic nephropathy (DN).
Apelin, an adipocyte-derived peptide, has been reported to be a promoting factor
for DN. In this study, we aim to determine whether apelin promotes progression of
DN by inducing podocyte dysfunction. kk-Ay mice were used as models for DN.
Apelin and its antagonist, F13A were intraperitoneally administered for 4 weeks,
respectively. Renal function and foot process proteins were analysed to evaluate
the effects of apelin on kk-Ay mice and podocytes. Apelin increased albuminuria
and decreased podocyte foot process proteins expression in kk-Ay mice, which is
consistent with the results that apelin receptor (APLNR) levels increased in
glomeruli of patients or mice with DN. In cultured podocytes, high glucose
increased APLNR expression and apelin administration was associated with
increased permeability and decreased foot process proteins levels. All these
dysfunctions were associated with decreased 26S proteasome activities and
increased polyubiquitinated proteins in both kk-Ay mice and cultured podocytes,
as demonstrated by 26S proteasome activation with cyclic adenosine monophosphate
(cAMP) or oleuropein. These effects seemed to be related to endoplasmic reticulum
(ER) stress, as apelin increased C/EBP homologous protein (CHOP) and peiF? levels
while cAMP or oleuropein reduced it in high glucose and apelin treated podocytes.
These results suggest that apelin induces podocyte dysfunction in DN through ER
stress which was induced by decreased proteasome activities in podocytes.
|Albumins/metabolism
[MESH]
|Animals
[MESH]
|Apelin Receptors
[MESH]
|Basement Membrane/drug effects/pathology
[MESH]
|Cell Membrane Permeability/drug effects
[MESH]
|Creatinine/metabolism
[MESH]
|Cyclic AMP/pharmacology
[MESH]
|Diabetes Mellitus, Type 2/pathology/physiopathology
[MESH]