Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 251.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 251.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 251.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\29593848
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Int+J+Physiol+Pathophysiol+Pharmacol
2018 ; 10
(1
): 29-38
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Saturated fatty acids bound to albumin enhance osteopontin expression and
cleavage in renal proximal tubular cells
#MMPMID29593848
Cobbs A
; Ballou K
; Chen X
; George J
; Zhao X
Int J Physiol Pathophysiol Pharmacol
2018[]; 10
(1
): 29-38
PMID29593848
show ga
Osteopontin (OPN) is one of the proinflammatory cytokines upregulated in the
kidneys of diabetic animals and patients with nephropathy. An increase in urinary
albumin and albumin-bound fatty acids (FA) presents a proinflammatory environment
to the proximal tubules in proteinuric kidney diseases including diabetic
nephropathy. This study was designed to examine if FA overload could stimulate
OPN expression and cleavage in renal tubule epithelial cells. OPN gene and
protein expression was examined in the kidney of Zucker diabetic (ZD) rats and
cultured proximal tubular cells exposed to either bovine serum albumin (BSA) or
BSA conjugated with palmitic acid (PA), the most abundant saturated plasma FA.
Real-time PCR analysis confirmed an upregulation of renal cortical OPN gene
correlated with albuminuria and nephropathy progression in ZD rats at the age of
7-20 weeks. Immunofluorescence staining of kidney sections revealed a massive
induction of OPN protein in albumin-overloaded proximal tubules of ZD rats. A
significant increase in both intact and cleaved OPN proteins was further
demonstrated in the diabetic kidney and urine samples, which was attenuated by
antiproteinuric treatment with losartan, an angiotensin II receptor blocker. When
exposed to fatty acid-free BSA, NRK-52E cells exhibited an increase in protein
levels of full-length and cleaved OPN. Moreover, the increase in OPN fragments
was greatly enhanced in the presence of PA (250-500 µM). Together, our results
support a stimulatory effect of albumin and conjugated FA on OPN expression and
cleavage in renal tubule epithelial cells. Thus, besides lowering
albuminuria/proteinuria, mitigating circulating FAs may be an effective
intervention for preventing and slowing down the progression of nephropathy
associated with obesity and type 2 diabetes.