title: Hepatocyte growth factor in vitreous and serum from patients with proliferative diabetic retinopathy.
abstract: BACKGROUND
  Hepatocyte growth factor (HGF) is an endothelium specific growth factor that has been implicated in angiogenesis, a crucial event for the development of proliferative diabetic retinopathy (PDR). The aim of the study is to determine the intravitreous concentrations of HGF in diabetic patients with PDR, and to investigate whether its serum levels could contribute to its intravitreous concentration.
  
  
  METHODS
  17 diabetic patients and seven non-diabetic patients in whom a vitrectomy was performed were studied. Both groups were matched by serum levels of HGF. Venous blood and vitreous samples were collected simultaneously at the time of vitreoretinal surgery. Vitreous and serum HGF were determined by ELISA.
  
  
  RESULTS
  Intravitreous concentrations of HGF (median and range) were higher in diabetic patients (17.04 ng/ml (9.98-80)) in comparison with non-diabetic patients (5.88 ng/ml (2.57-14.20); p=0. 003). Intravitreous HGF concentrations were strikingly higher than serum HGF concentrations both in diabetic patients (17.04 ng/ml (9. 98-80) v 0.66 ng/ml (0.26-1.26); p<0.001) and in the control group (5.88 ng/ml (2.57-14.20) v 0.68 ng/ml (0.49-0.96); p=0.003). No correlation was found between serum and vitreous levels of HGF in both groups (diabetic patients, r= -0.31; p=0.5 and control subjects r= -0.15; p=0.5).
  
  
  CONCLUSIONS
  The high vitreous levels of HGF observed in diabetic patients with PDR cannot be attributed to serum diffusion across the blood-retinal barrier. Therefore, intraocular synthesis appears to be the main contributing factor for the high vitreous HGF concentrations in diabetic patients, a cytokine that seems to be directly involved in the pathogenesis of PDR.
authors.affiliation: Endocrinology Department, Hospital Universitari, Vall d' Hebron, Barcelona, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Cantón
authors.forename: R
authors.initials: R
authors.lastname: Burgos
authors.forename: C
authors.initials: C
authors.lastname: Hernández
authors.forename: C
authors.initials: C
authors.lastname: Mateo
authors.forename: R M
authors.initials: RM
authors.lastname: Segura
authors.forename: J
authors.initials: J
authors.lastname: Mesa
authors.forename: R
authors.initials: R
authors.lastname: Simó
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D003930:Diabetic Retinopathy / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D017228:Hepatocyte Growth Factor / Q000032:analysis* / Q000096:biosynthesis; D006801:Humans; D008875:Middle Aged; D014822:Vitreous Body / Q000378:metabolism*
chemical_list: D017228:Hepatocyte Growth Factor