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Published on: August 14, 2013
MicroRNA Expression in Subretinal Fluid in Eyes Affected by Rhegmatogenous Retinal Detachment
Paolo Carpineto1,2, Ester Sara Di Filippo3, Agbeanda Aharrh Gnama2
1Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, 66100 Chieti, Italy.
Abstract:
Proliferative vitreoretinopathy (PVR) is an abnormal intraocular scarring process that can complicate cases of rhegmatogenous retinal detachment (RRD). Although previous studies have examined the relevance of microRNAs (miRNAs) in ophthalmic diseases, only a few studies have evaluated the expression profiles of microRNAs in subretinal fluid. We hypothesized that the expression profiles of specific miRNAs may change in response to RRD, in the subretinal fluid that is directly in contact with photoreceptors and the retinal pigment epithelium (RPE). We looked for a potential correlation between the expression of specific miRNAs in eyes with RRD and known clinical risk factors of PVR. A total of 24 patients (59 ± 11 years) who underwent scleral buckling procedure were enrolled in this prospective study. Twenty-four undiluted subretinal fluid samples were collected, RNA was isolated and qRT-PCR was performed to analyze the expression of 12 miRNAs. We found the existence of a positive association between the expression of miR-21 (p = 0.017, r = 0.515) and miR-34 (p = 0.030, r = 0.624) and the duration of symptoms related to retinal detachment. Moreover, the expression of miR-146a tended to decrease in patients who developed PVR. Subretinal fluid constitutes an intriguing biological matrix to evaluate the role of miRNAs leading to the development of PVR.
Insights
MicroRNAs (miRNAs) in subretinal fluid may indicate risk for proliferative vitreoretinopathy (PVR) after retinal detachment. Elevated miR-21 and miR-34 correlate with longer symptom duration, while miR-146a may decrease in PVR development.
Area of Science:
- Ophthalmology
- Molecular Biology
- Genetics
Background:
- Proliferative vitreoretinopathy (PVR) is a significant cause of vision loss following rhegmatogenous retinal detachment (RRD).
- MicroRNAs (miRNAs) play crucial roles in cellular processes, but their specific involvement in subretinal fluid during RRD and PVR development is underexplored.
- Subretinal fluid offers a unique biological matrix for studying intraocular disease mechanisms.
Purpose of the Study:
- To investigate the expression profiles of specific miRNAs within subretinal fluid from patients with RRD.
- To explore potential correlations between miRNA expression and clinical risk factors for PVR.
- To identify miRNAs that may serve as biomarkers for PVR development.
Main Methods:
- Prospective collection of 24 subretinal fluid samples from patients undergoing scleral buckling for RRD.
- RNA isolation and quantitative reverse transcription polymerase chain reaction (qRT-PCR) analysis of 12 selected miRNAs.
- Statistical analysis to correlate miRNA expression levels with clinical data, including symptom duration and PVR development.
Main Results:
- A positive association was observed between the expression of miR-21 and miR-34 and the duration of RRD symptoms (p=0.017, r=0.515 for miR-21; p=0.030, r=0.624 for miR-34).
- A trend towards decreased expression of miR-146a was noted in patients who subsequently developed PVR.
- These findings suggest distinct miRNA expression patterns related to RRD progression and PVR risk.
Conclusions:
- Subretinal fluid is a valuable source for analyzing miRNA expression in the context of RRD and PVR.
- Specific miRNAs, such as miR-21 and miR-34, may be linked to the chronicity of retinal detachment.
- Further research into miR-146a could elucidate its role as a potential protective factor or biomarker in PVR prevention.
