›› 2012, Vol. 32 ›› Issue (2): 133-.doi: 10.3969/j.issn.1674-8115.2012.02.002

• Original article (Basic research) • Previous Articles     Next Articles

Mechanism of inhibitory effect of insulin-like growth factor binding protein-related protein 1 on retinal angiogenesis

SUN Tao, ZHU Bi-jun, XU Xun, SU Li, GU Qing, XU Lin   

  1. Department of Ophthalmology, the First People's Hospital, Shanghai Jiaotong University, Shanghai 200080, China
  • Online:2012-02-28 Published:2012-02-28
  • Supported by:

    State Key Program of National Natural Science Foundation of China, 30930097;National Natural Science Foundation for Young Scholars of China, 30801269;Doctoral Innovation Fund of Shanghai Jiaotong University School of Medicine, BXJ0935;Shanghai Key Laboratory for Ocular Fundus Diseases Foundation, 07Z22911

Abstract:

Objective To investigate the mechanism of inhibitory effect of insulin-like growth factor binding protein-related protein (IGFBP-rP1) on vascular endothelial growth factor (VEGF)-induced retinal angiogenesis in vitro. Methods Retina-choroid endothelial cell line (RF/6A) of macaque was cultured and starved for 24 h. Then RF/6A cells were divided into control group and 50, 100 and 200 ng/mL IGFBP-rP1 groups, and flow cytometry was used to detect the apoptotic ratios of RF/6A cells. The starved RF/6A cells were also divided into control group, 10 ng/mL VEGF group and 50, 100 and 200 ng/mL IGFBP-rP1+10 ng/mL VEGF groups, the expression of B-Raf protein was detected with immunocytochemical staining, and the activation of Caspase 3 was determined by spectrophotometric method. Results Flow cytometry revealed that there was no significant difference in apoptotic ratios of RF/6A cells between control group and 50, 100 and 200 ng/mL IGFBP-rP1 groups (P>0.05). Immunocytochemical detection and Caspase 3 activation detection demonstrated that the average optical density of RF/6A cells in 10 ng/mL VEGF group was significantly higher than that in control group (P<0.05), D405 in 10 ng/mL VEGF group was significantly lower than that in control group (P<0.05), the average optical density of RF/6A cells in 50, 100 and 200 ng/mL IGFBP-rP1+10 ng/mL VEGF groups was significantly lower than that in 10 ng/mL VEGF group (P<0.05), D405 in 50, 100 and 200 ng/mL IGFBP-rP1+10 ng/mL VEGF groups was significantly higher than that in 10 ng/mL VEGF group (P<0.05), and there were significant differences in average optical density of RF/6A cells and D405 among 50, 100 and 200 ng/mL IGFBP-rP1+10 ng/mL VEGF groups (P<0.05). Conclusion IGFBPrP1 inhibits the biologic proceedings induced by VEGF during retinal angiogenesis by intervention of expression of BRaf protein and upregulation of Caspase 3 activity.

Key words: insulin-like growth factor binding protein-related protein 1, vascular endothelial growth factor, RF/6A cell, B-Raf, Caspase 3