title: [The relationship between corneal lymphangiogenesis and inflammation index after corneal alkali injury].
abstract: OBJECTIVE
  To discuss the relationship between corneal lymphangiogenesis and inflammation index (IF) in alkali burned corneas.
  
  
  METHODS
  Experimental research. Rat corneal hemangiogenesis and lymphangiogenesis were examined by 5'-nase-alkaline phosphatase (5'-NA-ALP) double enzyme-histochemistry and whole mount immunofluorescence at 1 day, 3 days, and 1, 2, 3, 4, 5, 6, 7, 8 weeks after alkaline burns, and the blood vessel counting (BVC) and the lymphatic vessel counting (LVC) were recorded. The state of corneal inflammation was observed under the slit lamp and evaluated by inflammation index (IF) grading at the same time. Then, the association of LVC with IF was examined. In addition, eleven human alkali burned corneas were obtained from 11 patients undergoing corneal transplantation in Zhongshan Ophthalmic Center from January 2005 to June 2008. Corneal lymphangiogenesis was examined by lymphatic vessel endothelial receptor (LYVE-1) immunohistochemistry. The significance of the differences in IF, inflammatory cells counting, burn history, and age between two groups was analyzed by using paired student's t-test.
  
  
  RESULTS
  New lymphatic vessels were present in rat alkali burned corneas. Corneal lymphangiogenesis developed 3 days after alkaline burns, reached the top 2 weeks after the injury, then decreased gradually, and disappeared at the end of the 5th week. Corneal lymphatics occurred behind corneal inflammation, but disappeared before corneal inflammation and hemangiogenesis. LVC was strongly and positively correlated with IF (r = 0.572, P < 0.01) after corneal alkaline burns. Among eleven human alkali burned corneas, corneal lymphatic vessels were present in 3 corneas. Compared with the other 8 cases without corneal lymphangiogenesis, the scores of IF was significantly higher (t = 3.28, P < 0.05), the inflammatory cells counting dramatically increased (t = 2.42, P < 0.05), but the age decreased significantly (t = 2.62, P < 0.05). However, the difference in burn history between two groups was not significant (t = 1.28, P > 0.05).
  
  
  CONCLUSIONS
  Corneal lymphangiogenesis develops after alkaline-burns and correlates closely with inflammation index.
authors.affiliation: Department of Ophthalmology, Guangzhou Women and Children's Medical Center, Guangzhou, China. lingshiqi123@163.com
authors.forename: Shi-qi
authors.initials: SQ
authors.lastname: Ling
authors.forename: Wei-hua
authors.initials: WH
authors.lastname: Li
authors.forename: Jian-gang
authors.initials: JG
authors.lastname: Xu
authors.forename: Wen-hui
authors.initials: WH
authors.lastname: Kuang
authors.forename: Chao-yang
authors.initials: CY
authors.lastname: Li
mesh_terms: D000818:Animals; D002057:Burns, Chemical / Q000473:pathology*; D065306:Corneal Injuries; D005126:Eye Burns / Q000473:pathology*; D006801:Humans; D007249:Inflammation; D042583:Lymphangiogenesis; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley