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Localization of acidic fibroblast growth factor in proliferative vitreoretinopathy membranes
F Malecaze1, A Mathis, J L Arné
1Laboratoire d'Ophtalmologie, Hôpital de Rangueil, Toulouse, France.
Abstract:
The pathogenesis of proliferative vitreoretinopathy (PVR) membranes remains poorly understood. We have studied the presence of acidic fibroblast growth factor (aFGF), a potent mitogen for many cells, within these membranes. We have used affinity purified monospecific anti-aFGF polyclonal antibodies, in conjunction with highly sensitive immunofluorescence techniques. The labelling was exclusively localized to cell bodies and was absent from the extracellular matrix. Double labelling techniques revealed that all cytokeratin positive cells (probably pigmented epithelial cells) and macrophages contained aFGF-like immunoreactivity, whilst glial cells were unlabelled. Appropriate controls indicated the specificity of the antibodies. Hence, the presence of this mitogenic molecule within certain cell types constituting PVR membranes may contribute to the pathogenesis.
Insights
Proliferative vitreoretinopathy (PVR) pathogenesis involves acidic fibroblast growth factor (aFGF). This study found aFGF within specific cells in PVR membranes, suggesting its role in disease development.
Area of Science:
- Ophthalmology
- Cell Biology
- Molecular Biology
Background:
- Proliferative vitreoretinopathy (PVR) is a major cause of retinal detachment after ocular surgery.
- The molecular mechanisms driving PVR membrane formation are not fully elucidated.
Purpose of the Study:
- To investigate the presence and localization of acidic fibroblast growth factor (aFGF) within PVR membranes.
- To determine which cell types within PVR membranes express aFGF.
Main Methods:
- Utilized affinity-purified monospecific anti-aFGF polyclonal antibodies.
- Employed highly sensitive immunofluorescence techniques for cellular localization.
- Performed double labeling to identify specific cell types expressing aFGF.
Main Results:
- Acidic fibroblast growth factor (aFGF) immunoreactivity was detected exclusively within cell bodies of PVR membranes.
- Cytokeratin-positive cells (likely pigmented epithelial cells) and macrophages showed aFGF presence.
- Glial cells within the membranes did not exhibit aFGF immunoreactivity.
Conclusions:
- The presence of the mitogen aFGF within specific cellular components of PVR membranes may contribute to disease pathogenesis.
- Understanding aFGF localization offers insights into PVR development and potential therapeutic targets.