title: A bio-mathematical model of time prediction in corneal angiogenesis after alkali burn.
abstract: BACKGROUND
  The determination of angiogenesis time is the key prerequisite to obtaining a balance between valid repair and excessive angiogenesis in wound healing. The aim of the investigation was to establish a bio-mathematical model predicting corneal angiogenesis time after alkali burn by back propagation neural network (BP neural network).
  
  
  METHODS
  The corneas of mice in 24 groups were burned by 0.01 mol/l NaOH. Five mice in each group were sacrificed at 6h after alkali burn. The expression levels of vegf and tsp2, determined by real-time quantitive PCR, were used as input vectors in BP neural network. Meanwhile, the corneal angiogenesis of other mice, inspected every 3h in 24 groups till the angiogenesis time were determined, served as output vectors. The data of 18 groups were randomly chosen for network adaptation while that of other 6 groups for simulation forecasting with functions of minmax (), postreg, prepca, trapca, respectively.
  
  
  RESULTS
  A bio-mathematical model of two-level BP neural network was established, for its purpose to predict the angiogenesis time through the expression values of vegf and tsp2. The performance index (0.00999996) was smaller than the target value (0.01) after adapting 36,557 times and the accuracy rate of this predict system was 83.33%. Furthermore, the ideal regression line and the optimization regression line were almost coincident (R=0.988 in network adaptation and R=0.793 in simulation forecasting).
  
  
  CONCLUSIONS
  The investigation indicated that the bio-mathematical model had available performance of simulation and forecasting. It might provide a novel method to solve clinical problems.
authors.affiliation: State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute for Traffic Medicine, Department 4, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, PR China. yanjun990820@yahoo.com
authors.forename: Jun
authors.initials: J
authors.lastname: Yan
authors.forename: Kaifa
authors.initials: K
authors.lastname: Wang
authors.forename: Yijun
authors.initials: Y
authors.lastname: Zeng
authors.forename: Jianxin
authors.initials: J
authors.lastname: Jiang
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Wang
authors.forename: Peifang
authors.initials: P
authors.lastname: Zhu
mesh_terms: D000818:Animals; D002057:Burns, Chemical / Q000209:etiology* / Q000378:metabolism; D016510:Corneal Neovascularization / Q000139:chemically induced*; D018076:DNA, Complementary / Q000378:metabolism; D005126:Eye Burns / Q000139:chemically induced*; D005260:Female; D008297:Male; D051379:Mice; D008954:Models, Biological; D009415:Nerve Net / Q000378:metabolism; D016133:Polymerase Chain Reaction / Q000379:methods; D012313:RNA / Q000378:metabolism; D011897:Random Allocation; D012972:Sodium Hydroxide / Q000009:adverse effects; D019699:Thrombospondins / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism; D000099262:Thrombospondin 2
chemical_list: D018076:DNA, Complementary; D012313:RNA; D012972:Sodium Hydroxide; D019699:Thrombospondins; D042461:Vascular Endothelial Growth Factor A; D000099262:Thrombospondin 2