Correlation of CD105 and vascular endothelial growth factor in laser-induced choroidal neovascularization in rats.
OBJECTIVE
Choroidal neovascularization (CNV) plays an important role in pathogenesis of age-related macular degeneration (AMD), ocular histoplasmosis syndrome (OHS) and so on. However, mechanisms of CNV formation are not fully understood. The aim of this study is to investigate the correlation between expressions of CD105 and vascular endothelial growth factor (VEGF) in experimental laser-induced CNV in rats.


METHODS
CNV model was established by 532 nm laser photocoagulation in Brown-Norway rats. The expression of CD105 and VEGF in CNV was observed by immunohistochemistry at 3, 7, 14, 21, 28 and 56 days after laser photocoagulation. The image analysis was performed with the professional software of Image-Pro Plus.


RESULTS
Fluorescein angiography showed fluorescein leakage in CNV from days 7 to 56 after photocoagulation. VEGF expression was mainly observed in vascular endothelial cells, ganglion cells, inner nuclear layers and retinal pigment epithelial cells in normal retina and vascular endothelial cells in normal choroid of the rats. On day 3 after photocoagulation, VEGF began to express in laser-induced lesions. VEGF was strongly expressed in CNV after 7 days (P < 0.05) and decreased after 14 days (P > 0.05). CD105 was initially presented in CNV at 7 days and obviously expressed at 14 days after photocoagulation (P < 0.05). Four weeks later, when angiogenesis tended toward inactive status, expression of CD105 was markedly decreased (P>0.05). There was notablely direct correlation between CD105-positive-microvessel density and positively semiquantitative scoring of VEGF in the CNV (r = 0.989, P < 0.01).


CONCLUSIONS
There is direct correlation between the expression of CD105 and VEGF in the laser-induced CNV in rat. It suggests that CD105 and VEGF might participate in the new blood vessel formation and promote the growth of CNV.
Xu
Jianfeng
J
Department of Ophthalmology, Institute of Ophthalmology of Chinese PLA, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China.
Wang
Yusheng
Y
Yang
Xiumei
X
Zhang
Peng
P
Chen
Lijun
L
D000818:Animals; D015703:Antigens, CD / Q000096:biosynthesis*; D002829:Choroid / Q000378:metabolism / Q000473:pathology; D020256:Choroidal Neovascularization / Q000209:etiology / Q000378:metabolism* / Q000473:pathology; D000071063:Endoglin; D004730:Endothelium, Vascular / Q000378:metabolism / Q000473:pathology; D017075:Laser Coagulation / Q000009:adverse effects; D008297:Male; D051381:Rats; D011914:Rats, Inbred BN; D011956:Receptors, Cell Surface / Q000096:biosynthesis*; D012160:Retina / Q000378:metabolism / Q000473:pathology; D042461:Vascular Endothelial Growth Factor A / Q000096:biosynthesis*
D015703:Antigens, CD; C064206:ENG protein, human; D000071063:Endoglin; D011956:Receptors, Cell Surface; D042461:Vascular Endothelial Growth Factor A