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2015 ; 5
(ä): 11231
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Aggravation of post-ischemic liver injury by overexpression of insulin-like
growth factor binding protein 3
#MMPMID26073647
Zhou L
; Koh HW
; Bae UJ
; Park BH
Sci Rep
2015[Jun]; 5
(ä): 11231
PMID26073647
show ga
Insulin-like growth factor-1 (IGF-1) is known to inhibit reperfusion-induced
apoptosis. IGF-binding protein-3 (IGFBP-3) is the major circulating carrier
protein for IGF-1 and induces apoptosis. In this study, we determined if IGFBP-3
was important in the hepatic response to I/R. To deliver IGFBP-3, we used an
adenovirus containing IGFBP-3 cDNA (AdIGFBP-3) or an IGFBP-3 mutant devoid of IGF
binding affinity but retaining IGFBP-3 receptor binding ability (AdIGFBP-3(GGG)).
Mice subjected to I/R injury showed typical patterns of hepatocellular damage.
Protein levels of IGFBP-3 were increased after reperfusion and showed a positive
correlation with the extent of liver injury. Prior injection with AdIGFBP-3
aggravated liver injury: serum aminotransferases, prothrombin time,
proinflammatory cytokines, hepatocellular necrosis and apoptosis, and neutrophil
infiltration were markedly increased compared to control mice. A decrease in
antioxidant potential and an upregulation of NADPH oxidase might have caused
these aggravating effects of IGFBP-3. Experiments using HepG2 cells and
N-acetylcysteine-pretreated mice showed a discernible effect of IGFBP-3 on
reactive oxygen species generation. Lastly, AdIGFBP-3 abolished the beneficial
effects of ischemic preconditioning and hypothermia. Mice treated with
AdIGFBP-3(GGG) exhibited effects similar to those of AdIGFBP-3, suggesting a
ligand-independent effect of IGFBP-3. Our results suggest IGFBP-3 as an
aggravating factor during hepatic I/R injury.
|Acetylcysteine/pharmacology
[MESH]
|Adenoviridae/genetics
[MESH]
|Alanine Transaminase/blood
[MESH]
|Animals
[MESH]
|Apoptosis/genetics
[MESH]
|Aspartate Aminotransferases/blood
[MESH]
|Free Radical Scavengers/pharmacology
[MESH]
|Gene Expression Regulation
[MESH]
|Genetic Vectors
[MESH]
|Hep G2 Cells
[MESH]
|Humans
[MESH]
|Hypothermia, Induced
[MESH]
|Insulin-Like Growth Factor Binding Protein 3/*genetics/metabolism
[MESH]