Related Experiment Video
Updated: Aug 20, 2026
Retinal Pathophysiological Evaluation in a Rat Model
Published on: May 6, 2022
A transmission and scanning electron microscopic study of surgically excised preretinal membrane proliferations in
Abstract:
Thirty preretinal membranes excised from diabetic patients during pars plana vitrectomy were examined by transmission electron microscopy, scanning electron microscopy, or both. All the specimens were still correctly orientated after removal from the eyes. All the specimens contained collagen in varying amounts and most had blood vessels with a thickened basal lamina and adjacent pericytes. Fenestrated capillaries were identified in only four of the 21 membranes containing blood vessels. A wide variety of cell types were scattered within the membranes, including polymorphonuclear leukocytes, lymphocytes, plasma cells, macrophages (containing melanin and hemosiderin), glial cells, retinal pigment epithelium, and cells of uncertain derivation. Scanning electron microscopy showed the retinal side of the membranes to be smoother than the vitreal side and disclosed preretinal cells on the vitreal side of the membranes, either as individual stellate cells or as a monolayer of flattened cells with microvilli. Membranes stripped from the surface of the retina had a smooth, generally acellular surface on the retinal side.
Insights
Diabetic preretinal membranes contain collagen and diverse cells, including blood vessels with thickened basal laminae. These membranes exhibit distinct cellular structures on their retinal and vitreal surfaces.
Area of Science:
- Ophthalmology
- Cell Biology
- Diabetic Retinopathy Research
Background:
- Preretinal membranes are a common complication in diabetic retinopathy.
- Understanding the cellular and structural composition of these membranes is crucial for developing effective treatments.
Purpose of the Study:
- To characterize the ultrastructural and cellular components of preretinal membranes from diabetic patients.
- To investigate the morphology of blood vessels and cell types within these membranes.
Main Methods:
- Examination of 30 preretinal membranes using transmission electron microscopy (TEM) and scanning electron microscopy (SEM).
- Analysis of membrane orientation, collagen content, blood vessel structure, and cell populations.
Main Results:
- All membranes contained collagen; most had blood vessels with thickened basal laminae.
- Fenestrated capillaries were rare. Diverse cell types were identified, including leukocytes, lymphocytes, plasma cells, macrophages, glial cells, and retinal pigment epithelium.
- SEM revealed a smoother retinal side and a cellular vitreal side with distinct cell arrangements.
Conclusions:
- Diabetic preretinal membranes are complex structures with varied cellular infiltration and vascular abnormalities.
- The distinct surface morphologies suggest specific roles in membrane formation and interaction with ocular tissues.
