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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 Endocrinology
2014 ; 155
(12
): 4665-75
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Blocking ligand occupancy of the ?V?3 integrin inhibits the development of
nephropathy in diabetic pigs
#MMPMID25171599
Maile LA
; Busby WH
; Gollahon KA
; Flowers W
; Garbacik N
; Garbacik S
; Stewart K
; Nichols T
; Bellinger D
; Patel A
; Dunbar P
; Medlin M
; Clemmons D
Endocrinology
2014[Dec]; 155
(12
): 4665-75
PMID25171599
show ga
Hyperglycemia stimulates secretion of ?V?3 ligands from vascular cells, including
endothelial cells, resulting in activation of the ?V?3 integrin. This study
determined whether blocking ligand occupancy of ?V?3 would inhibit the
development of diabetic nephropathy. Ten diabetic pigs received an F(ab)2
fragment of an antibody directed against the extracellular domain of the
?3-subunit, and 10 received a control IgG F(ab)2 for 18 weeks. Nondiabetic pigs
excreted 115 ± 50 ?g of protein/mg creatinine compared with control
F(ab)2-treated diabetic animals (218 ± 57 ?g/mg), whereas diabetic animals
treated with the anti-?3 F(ab)2 excreted 119 ± 55 ?g/mg (P < .05). Mesangial
volume/glomerular volume increased to 21 ± 2.4% in control-treated diabetic
animals compared with 14 ± 2.8% (P < .01) in animals treated with active
antibody. Diabetic animals treated with control F(ab)2 had significantly less
glomerular podocin staining compared with nondiabetic animals, and this decrease
was attenuated by treatment with anti-?3 F(ab)2. Glomerular basement membrane
thickness was increased in the control, F(ab)2-treated diabetic animals (212 ± 14
nm) compared with nondiabetic animals (170 ± 8.8 nm), but it was unchanged (159.9
± 16.4 nm) in animals receiving anti-?3 F(ab)2. Podocyte foot process width was
greater in control, F(ab)2-treated, animals (502 ± 34 nm) compared with animals
treated with the anti-?3 F(ab)2 (357 ± 47 nm, P < .05). Renal ?3 tyrosine
phosphorylation decreased from 13 934 ± 6437 to 6730 ± 1524 (P < .01) scanning
units in the anti-?3-treated group. We conclude that administration of an
antibody that inhibits activation of the ?3-subunit of ?V?3 that is induced by
hyperglycemia attenuates proteinuria and early histologic changes of diabetic
nephropathy, suggesting that it may have utility in preventing the progression of
this disease complication.