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. 2020 May 22;9(6):23.
doi: 10.1167/tvst.9.6.23. eCollection 2020 May.

MicroRNAs in the Vitreous Humor of Patients with Retinal Detachment and a Different Grading of Proliferative Vitreoretinopathy: A Pilot Study

Mario Damiano Toro  1   2 , Michele Reibaldi  2 , Teresio Avitabile  2 , Claudio Bucolo  3 , Salvatore Salomone  3 , Robert Rejdak  1   4 , Katarzyna Nowomiejska  1 , Sarah Tripodi  5 , Chiara Posarelli  6 , Marco Ragusa  7   8 , Cristina Barbagallo  7
Affiliations

MicroRNAs in the Vitreous Humor of Patients with Retinal Detachment and a Different Grading of Proliferative Vitreoretinopathy: A Pilot Study

Mario Damiano Toro et al. Transl Vis Sci Technol. .

Abstract

Purpose: Although the expression of microRNAs (miRNAs) in retinal pigment epithelial (RPE) cells undergoing epithelial-mesenchymal transition (EMT) is involved in the pathogenesis of proliferative vitreoretinopathy (PVR), its expression in the vitreous of patients with primary retinal detachment (RD) and different PVR grading has not yet been investigated. We assessed the expression of miRNAs in the vitreous humor (VH) of patients diagnosed with RD and different grading of PVR.

Methods: The VH was extracted from the core of the vitreous chamber in patients who had undergone standard vitrectomy for primary RD. RNA was extracted and TaqMan Low-Density Arrays (TLDAs) were used for miRNA profiling that was performed by single TaqMan assays. A gene ontology (GO) analysis was performed on the differentially expressed miRNAs.

Results: A total of 15 eyes with RD, 3 eyes for each grade of PVR (A, B, C, and D) and 3 from unaffected individuals, were enrolled in this prospective comparative study. Twenty miRNAs were altered in the comparison among pathological groups. Interestingly, the expression of miR-143-3p, miR-224-5p, miR-361-5p, miR-452-5p, miR-486-3p, and miR-891a-5p increased with the worsening of PVR grading. We also identified 34 miRNAs showing differential expression in PVR compared to control vitreous samples. GO analysis showed that the deregulated miRNAs participate in processes previously associated with PVR pathogenesis.

Conclusions: The present pilot study suggested that dysregulated vitreal miRNAs may be considered as a biomarker of PVR and associated with the PVR-related complications in patients with RD.

Translational relevance: The correlation between vitreal miRNAs and the pathological phenotypes are essential to identify the novel miRNA-based mechanisms underlying the PVR disease that would improve the diagnosis and treatment of the condition.

Keywords: microRNA; profiling; proliferative vitreoretinopathy; retinal detachment.

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Conflict of interest statement

Disclosure: M.D. Toro, None; M. Reibaldi, None; T. Avitabile, None; C. Bucolo, None; S. Salomone, None; R. Rejdak, None; K. Nowomiejska, None; S. Tripodi, None; C. Posarelli, None; M. Ragusa, None; C. Barbagallo, None

Figures

Figure 1.
Figure 1.
Heatmap showing the expression of miRNAs analyzed through TLDA profiling. The miRNA expression is represented as relative quantity (RQ), calculated with respect to the average of ΔCts of all the analyzed samples.
Figure 2.
Figure 2.
Boxplots showing the expression of miR-143-3p, miR-224-5p, miR-361-5p, miR-452-5p, miR-486-3p, and miR-891a-5p in the three pathological groups. **P value versus A + B < 0.005; ***P value versus A + B < 0.0005; #P value versus C < 0.05.
Figure 3.
Figure 3.
Heatmap showing the expression of miRNAs analyzed through TLDA profiling in the comparisons of patients with PVR compared to unaffected individuals. The miRNA expression is represented as relative quantity (RQ), calculated with respect to the average of ΔCts of all the analyzed samples.
Figure 4.
Figure 4.
PVR-related Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways regulated by miR-143-3p, miR-224-5p, miR-361-5p, miR-452-5p, miR-486-3p, and miR-891a-5p. The X-axis represents the -log10 of the P value for each pathway.
Figure 5.
Figure 5.
PVR-related Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways regulated by miRNAs showing altered expression in the comparisons PVR versus CTRL, A + B versus CTRL, and C + D versus CTRL. The X-axis represents the -log10 of the P value for each pathway.
See this image and copyright information in PMC

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