[Experimental choroidal neovascularization is inhibited by subretinal administration of Endostatin].
OBJECTIVE
Endostatin is an endogeneous angiogenesis inhibitor. The purpose of this study was to investigated the effect of Endostatin on the eyes of rats with experimental choroidal neovascularization (CNV).


METHODS
Experimental CNV was induced by laser photocoagulation. Animals were given subretinal injections of recombinant human Endostatin 20 microl (5 g/L) or 0.9% chlorine sodium. The intensity of fluorescein leakage from the photocoagulated lesions was studied 13 days after photocoagulation. The area of CNV at each rupture site was measured using high molecular weight FITC-dextran (MW 2 x 10(6)) for high resolution angiography in RPE-choroid-sclera flat mounts. In addition, 8 eyes in each group were removed and fixed 14 days after photocoagulation, cut into thin sections. The sections were examined by light microscopy. Immunolocalization of Endoglin (CD105) and factor VIII on sections of CNV lesions was studied by immunohistochemical evaluation.


RESULTS
After Endostatin injection, fluorescein leakage from the CNV lesions decreased significantly compared with the control eyes. The average area of CNV at sites of the Bruch's membrane rupture showed significant difference in eyes injected with Endostatin compared with control eyes. Endothelial cells demonstrated strong immunoreactivity of CD105 and factor VIII in CNV lesions of control eyes. CD105-positive cell were not detected in normal chorioretinal tissues.


CONCLUSIONS
The development of CNV can be inhibited by injection of Endostatin, which suggest that Endostatin may be beneficial in treating CNV and that further studies can be considered to evaluate this possibility.
Department of Ophthalmology, Second Affiliated Hospital, Hebei Medical College, Shijiazhuang 050000, China.
Qing-Li
QL
Shang
Jing-Xue
JX
Ma
Jing-Shuang
JS
Wei
Zhong-Lin
ZL
Shang
He-Ming
HM
Xiu
Ai-Qin
AQ
Yang
D020533:Angiogenesis Inhibitors / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D015703:Antigens, CD; D015153:Blotting, Western; D020256:Choroidal Neovascularization / Q000209:etiology / Q000378:metabolism / Q000517:prevention & control*; D004591:Electrophoresis, Polyacrylamide Gel; D000071063:Endoglin; D043169:Endostatins / Q000008:administration & dosage / Q000494:pharmacology*; D005123:Eye / Q000098:blood supply / Q000737:chemistry / Q000187:drug effects; D007150:Immunohistochemistry; D017075:Laser Coagulation / Q000009:adverse effects; D008297:Male; D051381:Rats; D011956:Receptors, Cell Surface; D012160:Retina / Q000737:chemistry / Q000187:drug effects / Q000473:pathology; D019010:Vascular Cell Adhesion Molecule-1 / Q000032:analysis
D020533:Angiogenesis Inhibitors; D015703:Antigens, CD; C064206:ENG protein, human; D000071063:Endoglin; D043169:Endostatins; D011956:Receptors, Cell Surface; D019010:Vascular Cell Adhesion Molecule-1