Clinical Sciences
The changes of aqueous humor vascular endothelial growth factor and pigment epithelium-derived factor levels before and after intravitreal injection of ranibizumab in proliferative diabetic retinopathy
Yunpeng Wang, Xiaohong Chen, Meizhu Chen
Published 2016-01-10
Cite as Chin J Exp Ophthalmol, 2016, 34(1): 60-64. DOI: 10.3760/cma.j.issn.2095-0160.2016.01.012
Abstract
BackgroundIntraocular neovascularization is a primary cause of visual reduce in proliferative diabetic retinopathy (PDR), and intravitreal injection of ranibizumab is one of treating approachs.Researching the mechanism of intravitreal injection of ranibizumab for PDR is a new target for the prevention and management of PDR.
ObjectiveThis study was to determine the levels of vascular endothelial growth factor (VEGF) and pigment epithelium-derived factor (PEDF) in aqueous humor of PDR eyes before and after intravitreal injection of ranibizumab.
MethodsSelf-controlled observational study was designed.Fifteen eyes of 15 PDR patients with type 2 diabetes mellitus were included in Fuzhou General Hospital of Nanjing Military Command from January to August 2014, and 1 eye combined with neovascular glaucoma and iris rubeosis.Aqueous samples of 0.1 ml at each time were collected before and 7 days after the injection of ranibizumab from all patients under the informed consent.The changes of aqueous VEGF and PEDF concentrations were detected and analyzed by enzyme-linked immunosorbent assay.This study complied with Declaration of Helsinki and the protocol was approved by this hospital.
ResultsThe freeVEGF concentrations before and 7 days after intravitreal injection were (179.4±136.5) pg/ml and (27.1±23.5) pg/ml, respectively, showing a significant reduce after intravitreal injection of ranibizumab (t=4.172, P=0.001). PEDF concentrations before and 7 days after intravitreal injection were (394.0±237.2) pg/ml and (267.7±199.6) pg/ml, respectively, showing a significant reduce after intravitreal injection of ranibizumab (t=5.443, P=0.000). Intraocular neovascularization vanished after intravitreal injection of ranibizumab and vitrectomy was carried out at the seventh day after intravitreal injection.
ConclusionsFree VEGF and PEDF levels in aqueous humor appear to be significantly decreased after intravitreal injection of ranibizumab, and ocular neovascularization disappears at same time, which avoids intraoperative bleeding during vitrectomy.
Key words:
Angiogenic factor/aqueous humor; Angiostatic proteins/aqueous humor; Diabetic retinopathy; Neovascularization; Vascular endothelial growth factor; Pigment epithelium-derived factor; Enzyme-linked immunosorbent assay; Ranibizumab
Contributor Information
Yunpeng Wang
Department of Ophthalmology, Fuzhou General Hospital of Nanjing Military Command, PLA, Dongfang Hospital Affiliated to Xiamen University, Clinical Medical College of Fujian Medical University, Clinical Medical College of the Second Military Medical University, Fuzhou 350025, China
Xiaohong Chen
Meizhu Chen