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TIMP-3 suppression induces choroidal neovascularization by moderating the polarization of macrophages in age-related macular degeneration.

Mol. Immunol.2019 Feb;106:119-126. Epub 2018 Dec 27
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摘要


PURPOSE:To investigate the role of tissue inhibitor of metalloproteinases-3 (TIMP-3) as a key moderator of macrophage polarization in choroidal neovascularization (CNV) lesions of model mice and in bone marrow-derived macrophage (BMDM). METHOD:We used siR-TIMP-3 to transfect BMDM and gave an intravitreal injection of siR-TIMP-3 to laser-induced CNV mice model, real time-PCR and western blot were applied for detecting the expressions of TIMP-3 and macrophages' biomarker. Besides, CNV lesions in different treatment groups of animal model were examined by the optical coherence tomography angiography (OCTA). RESULTS:Our experimental data showed that lack of TIMP-3 stimulated M2 polarization proved by real time-PCR and western blot in BMDMs and CNV mice model. Moreover, intravitreal injection of siR-TIMP-3 accelerated CNV formation using OCTA, which indicated that TIMP-3 suppression is related to pro-angiogenesis of M2 macrophage. CONCLUSION:We showed that the absence of TIMP-3 leads to a more pro-angiogenic microenvironment, playing a key role in CNV formation by positively modulating M2 polarization. The role of TIMP-3 in the regulating inflammation and novel therapeutic target of nAMD needs to be further studied.

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