Related Experiment Video
Updated: May 8, 2025
An Ex Vivo Tissue Culture Model for Fibrovascular Complications in Proliferative Diabetic Retinopathy
Published on: January 25, 2019
miR-124, miR-126-3p, and miR-200b: Potential therapeutic targets for VEGF-mediated complications in proliferative
Irfan Akaray1, Sadık Altan Ozal2, Hilal Sancar3
1Department of Ophthalmology, Private Nefes Hospital, Kastamonu, Turkey.
Introduction:
This study aimed to investigate alterations in intravitreal microRNA and vascular endothelial growth factor (VEGF) levels in patients with proliferative diabetic retinopathy (PDR) as these factors are implicated in PDR pathogenesis.
Methods:
Fifty-two participants, including 26 patients with PDR and 26 controls without diabetes, were included in this study. VEGF levels were assessed using ELISA, and seven microRNAs (miRNAs) (miR-19a, miR-20b, miR-27a, miR-124, miR-126-3p, miR-146a, and miR-200b) were analyzed using quantitative real-time PCR.
Results:
PDR patients exhibited significantly higher miR-124 and miR-126-3p levels in the vitreous material compared to controls ( P < 0.05). Conversely, miR-200b levels were significantly lower in the PDR group ( P < 0.05). VEGF-A levels were markedly elevated in PDR patients compared with controls ( P < 0.05). A nonsignificant positive correlation was found between miR-124 and miR-126-3p levels and VEGF levels (r = 0.361, P = 0.076 and r = 0.168, P = 0.422, respectively), whereas a nonsignificant negative correlation was observed between miR-200b and VEGF levels (r = -0.145, P = 0.488).
Conclusion:
Our study demonstrated a significant upregulation of miR-124 and miR-126-3p, along with a downregulation of miR-200b, in vitreous samples from patients with PDR, accompanied by elevated VEGF-A levels. These findings provide valuable insights into the pathogenesis of PDR. Further research is needed to evaluate the potential diagnostic and therapeutic implications of these molecular changes and to explore their viability as potential therapeutic targets.
Insights
Vitreous levels of miR-124 and miR-126-3p were elevated, while miR-200b was decreased in proliferative diabetic retinopathy (PDR). Vascular endothelial growth factor-A (VEGF-A) was also higher in PDR patients, suggesting roles in disease pathogenesis.
Area of Science:
- Ophthalmology
- Molecular Biology
- Diabetology
Background:
- Proliferative diabetic retinopathy (PDR) pathogenesis involves complex molecular mechanisms.
- Intravitreal microRNAs (miRNAs) and vascular endothelial growth factor (VEGF) are implicated in PDR development.
Purpose of the Study:
- To investigate alterations in intravitreal microRNA and VEGF levels in patients with PDR.
- To understand the role of specific miRNAs (miR-19a, miR-20b, miR-27a, miR-124, miR-126-3p, miR-146a, miR-200b) and VEGF in PDR pathogenesis.
Main Methods:
- A case-control study involving 26 PDR patients and 26 healthy controls.
- Vascular endothelial growth factor (VEGF) levels measured by ELISA.
- Quantitative real-time PCR used to analyze seven specific microRNAs (miRNAs) in vitreous samples.
Main Results:
- Significantly higher levels of miR-124 and miR-126-3p in PDR patients compared to controls (P < 0.05).
- Significantly lower levels of miR-200b in the PDR group (P < 0.05).
- Markedly elevated VEGF-A levels in PDR patients (P < 0.05).
Conclusions:
- Upregulation of miR-124 and miR-126-3p, downregulation of miR-200b, and elevated VEGF-A in PDR vitreous samples.
- These molecular changes offer insights into PDR pathogenesis.
- Further research is warranted to explore diagnostic and therapeutic potential.
