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Graefe's Archive for Clinical and Experimental Ophthalmology

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01-11-2011 | Basic Science

Monocyte/macrophages promote vasculogenesis in choroidal neovascularization in mice by stimulating SDF-1 expression in RPE cells

Authors: Yuan-yuan Shi, Yu-sheng Wang, Zhao-xia Zhang, Yan Cai, Jing Zhou, Hui-yuan Hou, Nico van Rooijen

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 11/2011

Abstract

Background

Monocyte-macrophages play important roles in choroidal neovascularization (CNV); however, the mechanism is unclear. This study investigated the effects of monocyte depletion on laser-induced CNV in mice, especially the involvement of bone marrow-derived cells (BMCs) and underlying molecular mechanisms.

Methods

Clodronate-liposomes (lip) were used to deplete monocytes and their effect on retinal pigmental epithelium (RPE) cells, endothelial cells, and BMCs was analyzed. Green fluorescent protein (GFP)-chimeric mice were developed by transplanting bone marrow cells from GFP transgenic mice to C57BL/6 J mice. CNV was induced by laser photocoagulation. Chimeric mice were intravenously treated with clodronate-lip, PBS-lip or PBS, 1 day before and after lasering. Histopathological and choroidal flatmount analysis were performed to measure CNV severity and BMCs recruitment. BMCs expression of endothelial cell marker CD31 and vascular smooth muscle cell marker α-SMA in CNV were detected by immunofluorescence. Expression of stromal cell-derived factor-1 (SDF-1) protein in vivo was detected by immunofluorescence as well as ELISA assay. SDF-1 was also examined by RT-PCR and ELISA in a human monocytes-RPE cells co-culturing system.

Results

No valid evidence for the toxicity of clodronate-lip was found. Depletion led to significant inhibition of CNV and BMCs recruitment into laser spots on days 3 and 14, reduced BMC expression of CD31 and α-SMA on day 14, and decreased expression of SDF-1 in vivo on day 3. SDF-1 was mostly within and around the RPE cells in the laser lesion. SDF-1 was dramatically up-regulated in RPE cells after co-culturing with monocytes.

Conclusions

Monocytes may promote experimental CNV, especially BMC contribution in mice, by promoting SDF-1 production in RPE cells.

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Title: Monocyte/macrophages promote vasculogenesis in choroidal neovascularization in mice by stimulating SDF-1 expression in RPE cells
Authors: Yuan-yuan Shi
Yu-sheng Wang
Zhao-xia Zhang
Yan Cai
Jing Zhou
Hui-yuan Hou
Nico van Rooijen
Publication date: 01-11-2011
Publisher: Springer-Verlag
Published in: Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 11/2011
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-011-1699-4

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Monocyte/macrophages promote vasculogenesis in choroidal neovascularization in mice by stimulating SDF-1 expression in RPE cells

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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