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·The common feature of retinal neovascularization is the formation of pathological neovascularization. The primary one of endogenous retinal neovascularization factor in current research is vascular endothelial growth factor (VEGF). SFlt-1, the soluble form of splicing in mRNA extracellular region of VEGFR - 1, which is short of intracellular tyrosine kinase domain can only encode the extracellular domain. Therefore, it only can bind with ligands but can not transmit signals, thus preventing the formation of neovascularization. SFlt-1,as a hot research topic in recent years, may provide a new gene therapy method for this disease. This review focus on the mechanism and research progress of sFlt-1 in retinal neovascularization.
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Objective To investigate the expression of soluble vascular endothelial growth factor receptor 1 (sFlt1) in human umbilical cord-derived mesenchymal stem cells (HUCMSC) under the condition of inflammatory cytokine and co-culture with rheumatoid arthritis fibroblast-like synoviocytes (RA-FLSs).Methods ① HUCMSC were cultured alone or stimulated by Tumour necrosis factor (TNF)-αt,interferon (IFN)-γor the combination of TNF-α and IFN-γ.The sFh1 levels of each group were detected by enzyme-linked immunosorbent assay (ELISA) at 24 h,48 h and 72 h respectively.② RA-FLSs and HUCMSC were cocultured in a transwell system with both of them cultured alone as control for 72 hours.ELISA was used to detect sFlt1 levels in each group.T test was used for comparison between two groups,and ANOVA was used to compare multi-group variables.Results ① The sFlt1 levels of TNF-α + IFN-γ group were significantly higher than those of the control group at 24 h and 48 h (24 h (5.4±0.4) ng/ml vs (2.8±1.7) ng/ml,t=0.942,P=0.026;48 h (7.2±0.8) vs (4.3±1.0) ng/ml,t=4.285,P=0.005),while that at 72 h was not significantly different [(9.1±1.7) ng/ml vs (7.0±1.4) ng/ml,t=0.683,P=0.52].And no significant difference in sFlt1 levels between control group and TNF-α group or IFN-γ stimulation group were observed.② Compared with RA-FLSs,the expression of sFlt1 in HUCMSC was significantly higher (8.19±3.64) ng/ml vs (0.19±0.08) ng/ml,t=7.280,P＜0.01].After co-cultured with RA-FLSs and HUCMSC,the sFlt1 concentration of the co-culture group was significantly higher than that of HUCMSC group [(17.26±6.92) ng/ml vs (8.19±3.64) ng/ml,t=3.985,P=0.000 7].Conclusion The sFlt1 expression of HUCMSC is up-regulated by inflammatory cytokine TNF-α combined with IFN-γ.RA FLSs may promote the co-cultured HUCMSC to increase sFlt1 expression by secreting inflammatory factors.
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Objective To research the correlation between the level of serum brain natriuretic peptide (BNP) ,soluble vascular endothelial growth factor receptor 1 (sFlt-1) and nitric oxide (NO) and the changes of condition in preeclampsia(PE) patients.Methods Totally 89 patients with PE who had prenatal examina-tion and normal delivery in the hospital from May 2014 to January 2017 were enrolled in this study as the PE group ,and 94 healthy pregnant women who underwent normal delivery during the same period were selected as the NP group.The levels of serum BNP ,sFlt-1 and NO in PE patients with different severity and different onset stages were compared and analyzed.Results The levels of serum BNP and sFlt-1 in the PE group were significantly higher than those in the NP group ,and the level of NO was significantly lower than that in the NP group ,and the differences were statistically significant (P＜0.05).The levels of serum BNP and sFlt-1 in the severe PE group were significantly higher than those in the mild PE group ,and the level of NO was signifi-cantly lower than that in the mild PE group ,and the differences were statistically significant (P＜0.05).The levels of serum BNP and sFlt-1 in the early and late onset PE groups were significantly higher than those in the early NP group and the late NP group ,while the NO levels were significantly lower than those in the early NP group and the late NP group ,and the differences were statistically significant (P＜0.05).Conclusion On the occurrence of PE ,the levels of serum BNP and sFlt-1 in pregnant women elevated abnormally ,and the lev-el of NO decreased.The changes of serum BNP ,sFlt-1 and NO levels are closely related to the development of PE ,and can be used as a reference index to detect the changes of PE.
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Age-related macular degeneration (AMD) is the leading cause of blindness in people over 50 years old. Vascular endothelial growth factor (VEGF) plays a critical role in the development of wet AMD. At present, the main treatment is monoclonal antibodies against VEGF, but the maintenance time is short, and it requires frequent and repeated treatment. Recently with the fast development of gene therapy, soluble VEGF receptor -1 (sFlt-1), which may act as one of the biomarkers of AMD, is gaining more attention. sFlt-1 is the unique endogenous VEGF inhibitor. With the development of AMD, serum sFlt-1 decreases markedly. This article reviewed the molecular structure and pathophysiological function of sFlt-1, its role in the advance of AMD, and the preclinical studies as well as clinical studies about it.
ABSTRACT
Age-related macular degeneration (AMD) is the leading cause of blindness in people over 50 years old. Vascular endothelial growth factor (VEGF) plays a critical role in the development of wet AMD. At present, the main treatment is monoclonal antibodies against VEGF, but the maintenance time is short, and it requires frequent and repeated treatment. Recently with the fast development of gene therapy, soluble VEGF receptor -1 (sFlt-1), which may act as one of the biomarkers of AMD, is gaining more attention. sFlt-1 is the unique endogenous VEGF inhibitor. With the development of AMD, serum sFlt-1 decreases markedly. This article reviewed the molecular structure and pathophysiological function of sFlt-1, its role in the advance of AMD, and the preclinical studies as well as clinical studies about it.
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Objective To investigate the level of serum vascular endothelial growth factor and soluble vascular endothelial growth factor receptor-1 in patients with pre-eclampsia and eclampsia.Methods Serum vascular endothelial growth factor and soluble vascular endothelial growth factor receptor-1 in peripheral venous blood were determined by ELISA in patients with pre-eclampsia(n=9),severe pre-eclampsia(n=10) and eclampsia(n=5)(total eclampsia n=24) and healthy controls(n=18).Results Patients with pre-eclampsia and eclampsia had higher level of serum sVEGFR-1(pre-eclampsia:58?7 mg/L,severe pre-eclampsia:82?15 mg/L,eclampsia:96?13 mg/L vs control:11?3 mg/L,P