title: [The correlation study of the expression of VEGF with t-PA and PAI expression in plasma and intraocular tissue in proliferative diabetic retinopathy].
abstract: OBJECTIVE
  To evaluate the correlation between the expression of VEGF with t-PA and PAI expression in plasma aqueous humor and vitreous of proliferative diabetic retinopathy (PDR).
  
  
  METHODS
  It was an experimental study. The concentrations of VEGF t-PA and PAI in plasma, aqueous humor and vitreous body in PDR and normal group were detected by ELISA.
  
  
  RESULTS
  The levels of VEGF (53.37 ng/L) and PAI (8.00 µg/L) in the plasma of PDR patients were higher than control group, and there was significant statistically difference between them (Z = -3.437, -5.816; P < 0.01). The levels of t-PA (24.32 µg/L) in plasma of PDR patients and control group was no statistically difference between them (Z = -1.715, P = 0.086). The levels of VEGF (335.00 ng/L) t-PA (5.70 µg/L) and PAI (0.63 µg/L) in the aqueous humor of PDR patients were higher than control group, and there was statistically difference between them (Z = -4.805, -1.967, -4.018; P < 0.05). The levels of VEGF (691.69 ng/L) t-PA (13.05 µg/L) and PAI (4.01 µg/L) in the vitreous of PDR patients were higher than control group , and there was statistically difference between them (Z = -2.807, -2.642, -2.230;P < 0.05). Compare the plasma aqueous humor and vitreous of PDR patients. The levels of VEGF is: vitreous>aqueous humor>plasma. The levels of t-PA is: plasma>vitreous>aqueous humor. The levels of PAI is: plasma and vitreous>aqueous humor. The expression of VEGF was highly correlated with t-PA and PAI in plasma aqueous humor and vitreous of PDR (P < 0.05).
  
  
  CONCLUSIONS
  VEGF PAI in plasma, VEGF t-PA PAI in aqueous humor and vitreous were increases. The expression of VEGF was positive correlated with t-PA and PAI in plasma aqueous humor and vitreous of PDR.
authors.affiliation: Department of Ophthalmology, General Hospital of Ningxia Medical University, Yinchuan 750004, China. Email: shulingwtt@sina.com.
authors.forename: Shuling
authors.initials: S
authors.lastname: Wu
authors.affiliation: Department of Ophthalmology, General Hospital of Ningxia Medical University, Yinchuan 750004, China.
authors.forename: Xianglian
authors.initials: X
authors.lastname: He
mesh_terms: D001082:Aqueous Humor / Q000737:chemistry*; D003930:Diabetic Retinopathy / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D015849:Plasminogen Inactivators / Q000032:analysis* / Q000097:blood; D010959:Tissue Plasminogen Activator / Q000032:analysis* / Q000097:blood; D042461:Vascular Endothelial Growth Factor A / Q000032:analysis* / Q000097:blood; D014822:Vitreous Body / Q000737:chemistry*
chemical_list: D015849:Plasminogen Inactivators; D042461:Vascular Endothelial Growth Factor A; D010959:Tissue Plasminogen Activator