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Vitreous Microparticle Shedding in Retinal Detachment: A Prospective Comparative Study
Perle Tumahai1, Philippe Saas2, Fanny Ricouard1
1Department of Ophthalmology, University Hospital of Besançon, Besançon, France.
Purpose:
Microparticles (MPs) are membrane-derived vesicles measuring less than 1 μm in diameter. They are shed from nearly every activated or preapoptotic cell and may exhibit biologic activities in inflammation or apoptosis settings. The main purpose of this study was to determine whether MP shedding was higher in the vitreous of patients with retinal detachment (RD).
Methods:
This was a prospective, comparative study. Levels of vitreous MPs (including phosphatidylserine [PS]-expressing MPs, photoreceptor cell-derived MPs, and photoreceptor cell-derived MPs expressing PS) and soluble proinflammatory factors (i.e., monocyte chemoattractant protein-1, intercellular adhesion molecule-1, and IL-6) were analyzed by flow cytometry. Samples were obtained from 49 eyes undergoing RD surgery and 41 control eyes.
Results:
Vitreous levels of all the MPs studied were significantly increased in the RD group. Vitreous MP levels were correlated with levels of at least one proinflammatory factor depending on MP subsets. Concerning clinical parameters, vitreous PS-expressing MP and PS-expressing photoreceptor cell-derived MP levels were higher depending on the duration of RD at surgery, the detached retina surface, and the macula status and were found more sensitive than proinflammatory factors only for the duration of RD at surgery.
Conclusions:
Vitreous concentrations of MPs (mainly derived from photoreceptor cells) are higher after rhegmatogenous RD and found to be correlated with soluble proinflammatory factors.
Insights
Microparticle (MP) shedding is elevated in the vitreous of patients with retinal detachment (RD). These MPs, particularly those from photoreceptor cells, correlate with inflammation and RD severity.
Area of Science:
- Ophthalmology
- Cell Biology
- Inflammation Research
Background:
- Microparticles (MPs) are small vesicles shed from activated or apoptotic cells.
- MPs may play a role in biological processes like inflammation and apoptosis.
- Previous research has not extensively studied MP levels in retinal detachment (RD).
Purpose of the Study:
- To investigate if microparticle (MP) shedding is increased in the vitreous of patients with retinal detachment (RD).
- To explore the correlation between MP levels and soluble proinflammatory factors in RD.
- To assess the relationship between MP levels and clinical parameters of RD.
Main Methods:
- Prospective, comparative study analyzing vitreous samples from 49 RD eyes and 41 control eyes.
- Flow cytometry used to quantify various MP subsets (e.g., PS-expressing, photoreceptor-derived) and proinflammatory factors (MCP-1, ICAM-1, IL-6).
- Clinical data including RD duration, retinal surface area, and macula status were collected.
Main Results:
- Significantly higher vitreous levels of all studied MPs were observed in the RD group compared to controls.
- Vitreous MP levels showed correlations with specific soluble proinflammatory factors.
- Elevated PS-expressing MPs correlated with RD duration, detached retinal surface area, and macula status, demonstrating higher sensitivity than proinflammatory factors for RD duration.
Conclusions:
- Rhegmatogenous retinal detachment (RD) is associated with increased vitreous concentrations of microparticles (MPs).
- Photoreceptor cell-derived MPs are a major component of the elevated MP levels in RD.
- Vitreous MP levels in RD are correlated with soluble proinflammatory factors.
