Related Experiment Video
Updated: Aug 23, 2026
An Ex Vivo Tissue Culture Model for Fibrovascular Complications in Proliferative Diabetic Retinopathy
Published on: January 25, 2019
Red blood cell membrane mechanical fluctuations in non-proliferative and proliferate diabetic retinopathy
Michaella Goldstein1, Igal Leibovitch, Shlomo Levin
1Department of Ophthalmology, Tel-Aviv Medical Center, 6 Weitzman Street, 64239, Tel-Aviv, Israel.
Purpose:
To study whether cell membrane mechanical fluctuation (CMF) of red blood cells (RBCs) are attenuated in non-proliferative diabetic retinopathy (NPDR) and proliferative diabetic retinopathy (PDR).
Patients And Methods:
Point dark-field microscopy-based recordings of local membrane displacements (frequency 0.3-25 Hz) were compared between type 2 diabetes patients with mild-to-moderate and severe NPDR and type 2 diabetes patients with PDR. The matched control group, corresponding to each stage of diabetic retinopathy, was based on non-diabetic patients who were evaluated in our clinic due to cataract.
Results:
The average mean values of the maximal CMF amplitude did not differ between RBCs of NPDR patients (n=20) and controls (n=20) (19.5+/-1.5% and 19.6+/-1.7%, respectively). A statistically significant decrease in CMF amplitudes was observed in patients with PDR compared with patients with a non-proliferative disease (NPDR -20%, PDR -90%).
Conclusion:
This new rheological characteristic demonstrates differences in the mechanical properties of RBCs in different stages of diabetic retinopathy. The significant reduction in CMF in patients with PDR may shed more light on the possible mechanism modulating retinal ischemia and leading to angiogenesis in these patients. Larger-scale studies are needed to evaluate these findings and the possible correlation between significantly lower CMF values and the progression of diabetic retinopathy.
Insights
Cell membrane mechanical fluctuation (CMF) in red blood cells (RBCs) remains unchanged in non-proliferative diabetic retinopathy (NPDR) but significantly decreases in proliferative diabetic retinopathy (PDR). This finding may explain retinal ischemia in PDR patients.
Area of Science:
- Ophthalmology
- Rheology
- Diabetology
Background:
- Diabetic retinopathy (DR) is a major complication of diabetes.
- Red blood cell (RBC) mechanical properties may be altered in DR.
- Cell membrane mechanical fluctuation (CMF) is a potential indicator of RBC health.
Purpose of the Study:
- To investigate whether CMF of RBCs is altered in non-proliferative diabetic retinopathy (NPDR) and proliferative diabetic retinopathy (PDR).
- To compare CMF in diabetic patients with different stages of DR and healthy controls.
Main Methods:
- Point dark-field microscopy was used to record RBC membrane displacements.
- CMF was analyzed in type 2 diabetes patients with NPDR (mild-to-severe) and PDR.
- Matched control groups of non-diabetic individuals were included.
Main Results:
- No significant difference in CMF was found between NPDR patients and controls.
- A statistically significant decrease in CMF was observed in PDR patients (-90%) compared to NPDR patients (-20%).
Conclusions:
- CMF differs across stages of diabetic retinopathy, indicating altered RBC mechanical properties.
- Reduced CMF in PDR may contribute to retinal ischemia and angiogenesis.
- Further research is needed to validate these findings and explore the correlation with DR progression.
