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  • Title: ERK1/2 signaling pathways involved in VEGF release in diabetic rat retina.
    Author: Ye X, Xu G, Chang Q, Fan J, Sun Z, Qin Y, Jiang AC.
    Journal: Invest Ophthalmol Vis Sci; 2010 Oct; 51(10):5226-33. PubMed ID: 20445124.
    Abstract:
    PURPOSE: Vascular endothelial growth factor (VEGF) is one of the major factors promoting diabetic retinopathy (DR). A better understanding of the signaling pathway in VEGF regulation is of clinical importance to identify more precise therapeutic targets for diabetic retinopathy. The ERK1/2 signaling pathway has been shown to play a key role in some oncoma and hematologic diseases by mediating VEGF release. This research was conducted to determine whether the ERK1/2 signaling pathway also plays a major role in VEGF release in DR development. METHODS: One hundred Sprague-Dawley (SD) rats were induced to diabetes by streptozotocin (STZ) injection and monitored at several time points (1, 2, 3, 4, 8, and 12 weeks) for ERK1/2 phosphorylation, Activator protein (AP)-1 activity and concentration, and VEGF protein and mRNA expression, using immunohistochemical and biochemical methods. RESULTS. The ERK1/2 signaling pathway was rapidly activated 1 week after diabetes was induced. AP-1, the downstream transcription factor of ERK1/2, was also activated, and VEGF became highly regulated in a similar trend. U0126, an inhibitor of ERK1/2, also downregulated VEGF expression, in addition to ERK1/2 and AP-1 activity. CONCLUSIONS: ERK1/2 signaling pathway is involved in VEGF release in diabetic rat retina; therefore, ERK1/2 may be a potential therapeutic target of DR.
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