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Updated: Jun 4, 2026
Characterization of a Novel Human Organotypic Retinal Culture Technique
Published on: June 9, 2021
Interleukin-6 and the matrix metalloproteinase response in the vitreous during proliferative vitreoretinopathy
Chrysanthos Symeonidis1, Eleni Papakonstantinou, Sofia Androudi
1Department of Ophthalmology, Leicester Royal Infirmary, University Hospitals of Leicester NHS Trust, United Kingdom.
Purpose:
To investigate the levels of IL-6 in the vitreous of patients with RRD complicated with PVR and correlate the IL-6 levels with matrix metalloproteinase (MMP)-1,-2,-3,-8,-9 and tissue inhibitor of metalloproteinases (TIMP)-1 with respect to RRD extent, duration and PVR grade.
Design:
Cohort study.
Participants:
Twenty-eight vitreous samples from 28 eyes of 28 patients with RRD complicated with PVR.
Methods:
Institutional study. Twenty-eight vitreous samples from 28 eyes of 28 patients with RRD complicated with PVR were collected during pars plana vitrectomy (PPV) and were compared to vitreous control samples. IL-6, MMP-1,-3,-8 and TIMP-1 levels were measured using ELISA while enzymatic activity of MMP-2, and -9 was determined employing gelatin zymography.
Results:
Protein IL-6 (p=0.030), MMP-1 (p=0.003), MMP-3 (p=0.003), TIMP-1 (p=0.001) levels as well as enzymatic activity of proMMP-9 (p=0.013), MMP-9 (p=0.017) and proMMP-2 (p=0.010), were significantly increased in PVR patients as compared to controls. IL-6 levels correlated with MMP-1 (p=0.002), proMMP-2 (p=0.006), MMP-3 (p=0.001) and TIMP-1 (p=0.006). Regression analysis revealed positive correlations between IL-6 and all MMPs and TIMP-1.
Conclusions:
Taking into account the previously established effect of interleukins in MMP activity, the findings of this study suggest a role of IL-6 in MMP stimulation during PVR development.
Insights
Elevated levels of Interleukin-6 (IL-6) and matrix metalloproteinases (MMPs) were found in patients with rhegmatogenous retinal detachment (RRD) and proliferative vitreoretinopathy (PVR). This suggests IL-6 may stimulate MMPs, contributing to PVR development.
Area of Science:
- Ophthalmology
- Retinal Diseases
- Inflammation and Immunology
Background:
- Proliferative vitreoretinopathy (PVR) is a major cause of visual impairment following rhegmatogenous retinal detachment (RRD).
- The role of inflammatory mediators, such as Interleukin-6 (IL-6), and matrix metalloproteinases (MMPs) in PVR pathogenesis requires further elucidation.
Purpose of the Study:
- To quantify IL-6 levels in the vitreous of patients with RRD complicated by PVR.
- To correlate IL-6 levels with specific MMPs (MMP-1, -2, -3, -8, -9) and tissue inhibitor of metalloproteinases (TIMP-1).
- To investigate the relationship between these molecular markers and RRD extent, duration, and PVR grade.
Main Methods:
- A cohort study involving 28 patients with RRD and PVR.
- Vitreous samples were collected during pars plana vitrectomy (PPV).
- IL-6, MMP-1, -3, -8, TIMP-1 levels were measured via ELISA; MMP-2 and -9 activity was assessed using gelatin zymography.
- Samples were compared to vitreous control samples.
Main Results:
- Significantly elevated levels of IL-6, MMP-1, MMP-3, TIMP-1, proMMP-9, MMP-9, and proMMP-2 were observed in PVR patients compared to controls.
- IL-6 levels showed significant positive correlations with MMP-1, proMMP-2, MMP-3, and TIMP-1.
- Regression analysis confirmed positive correlations between IL-6 and all measured MMPs and TIMP-1.
Conclusions:
- The study findings suggest a significant role for IL-6 in stimulating MMP activity during the development of PVR.
- These results highlight the potential involvement of the IL-6/MMP pathway in the pathophysiology of PVR in RRD patients.
