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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 J+Biol+Chem
2013 ; 288
(24
): 17631-42
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Insulin-like growth factor I (IGF-I)-induced chronic gliosis and retinal stress
lead to neurodegeneration in a mouse model of retinopathy
#MMPMID23620587
Villacampa P
; Ribera A
; Motas S
; Ramírez L
; García M
; de la Villa P
; Haurigot V
; Bosch F
J Biol Chem
2013[Jun]; 288
(24
): 17631-42
PMID23620587
show ga
Insulin-like growth factor I (IGF-I) exerts multiple effects on different retinal
cell types in both physiological and pathological conditions. Despite the growth
factor's extensively described neuroprotective actions, transgenic mice with
increased intraocular levels of IGF-I showed progressive impairment of
electroretinographic amplitudes up to complete loss of response, with loss of
photoreceptors and bipolar, ganglion, and amacrine neurons. Neurodegeneration was
preceded by the overexpression of genes related to retinal stress, acute-phase
response, and gliosis, suggesting that IGF-I altered normal retinal homeostasis.
Indeed, gliosis and microgliosis were present from an early age in transgenic
mice, before other alterations occurred, and were accompanied by signs of
oxidative stress and impaired glutamate recycling. Older mice also showed
overproduction of pro-inflammatory cytokines. Our results suggest that, when
chronically increased, intraocular IGF-I is responsible for the induction of
deleterious cellular processes that can lead to neurodegeneration, and they
highlight the importance that this growth factor may have in the pathogenesis of
conditions such as ischemic or diabetic retinopathy.