ArticleInternational journal of ophthalmology2011
Control of peroxyntrite-induced production of inducible nitric oxide synthase isoforms and antagonism of cholecystokinin octapeptide -8 in retinal pigment epithelial cells in vivo.
Article in International journal of ophthalmology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors at 1 institution in 1 country.
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Abstract
aimTo explore if peroxyntrite (ONOO(-)) induced iNOS via Fas/Fas/L pathway in diabetic rats and the effection of cholecystokinin octapeptide-8 (CCK-8) as therapeutic agent for decrease diabetic retinopathy.
methodsThirty-six rats were taken as control group, seventy two were given (streptozotocin) STZ (45mg/kg) and then divided into ONOO(-) group and CCK-8 group (peritoneal injection CCK-8). STZ-induced diabetic rats were treated with CCK-8 for 60 days. Western blotting analysis, DNA ladder, RT-PCR, immunohistochemistry and flow cytometry were used for determining the expression of nitrotyrosine (NT, the foot print of ONOO(-)); apoptosis and inducible nitric oxide synthase (iNOS) mRNA as well as Fas/Fasl signal transduction in RPE cells.
resultsBoth RPE cells in ONOO(-) and CCK-8 group developed apoptosis and expressed NT, iNOS mRNA and Fas/Fasl. But latter delayed the all changes in a time-dependent manner compared with control and ONOO(-) group (P<0.001). iNOS and Fas/Fasl were up-regulated and associated with an increase of expression of ONOO(-)in vivo.
conclusionThe study suggested that apoptosis of RPE was partly induced by ONOO(-) may be the new way of oxidative damage to the RPE cells. CCK-8 decreased RPE cells apoptosis partly induced by ONOO(-) and is a potential drug for therapy of diabetic retinopathy. The mechanism of CCK-8 dealing with RPE cells may be related to its direct inhibition of the formation of iNOS to produce ONOO(-) and antagnism of damage of ONOO(-) to RPE cells.
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