Abstract
Aims
Ischemia-induced neovascularization is the key feature of proliferative diabetic retinopathy. Macrophage migration inhibitory factor (MIF) is a pleiotropic proinflammatory and proangiogenic cytokine, and its levels are elevated in the vitreous of patients with proliferative diabetic retinopathy. In this study, we aimed at investigating the relative potential of MIF in the ischemia-induced retinal neovascularization.
Methods
Both WT and MIF-knockout mice were subjected to the retinopathy of prematurity (ROP) model. Intraretinal vessel regrowth was assessed by whole-mount immunofluorescence, and preretinal neovascularization was analyzed in retinal vertical sections after periodic acid-Schiff staining in the hypoxic stage of the ROP model. Gene expression of selected proangiogenic and proinflammatory factors at postnatal day 13 (p13) was measured by real-time PCR. Vascular endothelial growth factor (VEGF) expression, recruitment of endothelial progenitor cells (EPCs) and microglial activation were analyzed with immunofluorescence.
Results
MIF deficiency increased areas of vascular obliteration by 49%, reduced sprouting tips by 27% and inhibited preretinal angiogenesis by 35%. VEGF expression was reduced in Müller cells of MIF-knockout mice. MIF absence reduced gene expression of erythropoietin, tumor necrosis factor alpha and intercellular adhesion molecule-1 by 30, 70 and 50%, respectively, decreased the number of retinal EPCs by 37.5% and inhibited microglial activation in the hypoxic condition.
Conclusions
In conclusion, we found that MIF has proangiogenic and proinflammatory properties in retinal neovascularization. The proangiogenic role of MIF in ischemia-induced retinal neovascularization is associated with the expression of VEGF and erythropoietin, EPC recruitment and inflammation. Therefore, MIF has a potential role in the pathological angiogenesis of proliferative retinopathy.
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Acknowledgements
This study was supported by Grants from the DDG (Deutsche Diabetes Gesellschaft) and the EFSD (European Foundation for the Study of Diabetes). The authors thank P. Bugert and N. Dietrich for their excellent technical assistance.
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Jing Wang, Jihong Lin, Ulrike Kaiser and Hans-Peter Hammes have nothing to disclose. Paulaus Wohlfart is full research employee of Sanofi and involved in identification and validation of new therapeutic approaches in diabetes.
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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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All applicable national and institutional guidelines for the care and use of animals were followed.
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Wang, J., Lin, J., Kaiser, U. et al. Absence of macrophage migration inhibitory factor reduces proliferative retinopathy in a mouse model. Acta Diabetol 54, 383–392 (2017). https://doi.org/10.1007/s00592-016-0956-8
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DOI: https://doi.org/10.1007/s00592-016-0956-8