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The components of the proliferative membranes in retinopathy of prematurity: an electron microscopic study
1Department of Ophthalmology, College of Medicine, Seoul National University, Korea.
Insights
Electron microscopy reveals that proliferative membranes in retinopathy of prematurity (ROP) are primarily composed of collagen matrix, with cellular components like astrocytes and myofibroblasts degenerating over time. This suggests a collagen-rich scar forms in advanced ROP.
Area of Science:
- Ophthalmology
- Cell Biology
- Pathology
Background:
- Retinopathy of prematurity (ROP) is a leading cause of blindness in premature infants.
- Proliferative membranes are a hallmark of advanced ROP (Stage 5).
- Understanding the cellular and matrix composition of these membranes is crucial for therapeutic development.
Observation:
- Electron microscopy was used to examine proliferative membranes from nine ROP Stage 5 patients.
- Membranes were obtained during surgical procedures like lensectomy and vitrectomy.
- Analysis focused on identifying cellular and extracellular matrix components.
Findings:
- Fibrous astrocytes, myofibroblasts, lymphocytes, macrophages, and calcification were identified in some cases.
- Fibroblast-like cells were present in one case.
- Collagenous and vascular tissues were prevalent, with most membranes being hypocellular and collagen-rich.
Implications:
- Fibrous astrocytes, myofibroblasts, fibroblasts, and vascular structures are implicated in ROP membrane formation.
- These cellular components appear to degenerate, leaving a residual collagen matrix.
- The findings suggest a scar-like tissue composition in advanced ROP, potentially guiding future treatment strategies.
Abstract:
Electron microscopic examination of proliferative membranes in retinopathy of prematurity (ROP) was performed in order to evaluate the components of the membranes. The proliferative membranes were obtained from nine patients with ROP stage 5 during pars plicata lensectomy, vitrectomy, and delamination of membrane. Fibrous astrocytes, myofibroblasts, lymphocytes, macrophages, and calcification were found respectively in two cases, and fibroblast-like cells were found in one case. Varying amounts of collagen tissues were found in eight cases and vascular tissues in four cases. Most of membranes were hypocellular and composed mainly of collagen matrix. It is considered that fibrous astrocytes, myofibroblasts, fibroblasts, and vascular structures are involved in the formation of proliferative membranes of ROP, and that later these cells degenerate and disappear, and that finally only collagen matrix remains in the membranes.