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Aquaporin-1 expression in proliferative vitreoretinopathy and in epiretinal membranes
Elie Motulsky1, Dany Salik2, Xavier Janssens3
1Laboratory of Pathophysiological and Nutritional Biochemistry, Université Libre de Bruxelles, Blg G/E, CP 611, 808 Route de Lennik, 1070 Brussels, Belgium ; Department of Ophthalmology, CHU Saint-Pierre, Université Libre de Bruxelles, Brussels, Belgium ; Department of Ophthalmology, CHU Brugmann, Brussels, Belgium.
Purpose:
Aquaporin-1 (AQP1) is involved in cell migration and proliferation; therefore, the purpose of the study was to investigate its expression in proliferative vitreoretinopathy (PVR) and epiretinal membranes (ERM).
Methods:
19 membranes from PVR and ERM were collected following eye surgery. AQP1 mRNA and protein expressions were determined by RT-qPCR and immunofluorescence in the membranes from PVR and ERM.
Results:
AQP1 mRNA and protein were expressed in both PVR and ERM as shown by RT-qPCR and immunofluorescence. AQP1 protein expression was heterogeneous among and between PVR and ERM and colocalized with alpha-smooth muscle actin ( α SMA) and with glial fibrillary acidic protein (GFAP). There were a higher percentage of cells coexpressing AQP1 and α SMA than AQP1 and GFAP. GFAP and α SMA did not colocalize.
Conclusion:
Our data show for the first time AQP1 expression in both PVR and ERM. AQP1 is expressed mostly by the α SMA-positive cells, presumably myofibroblasts, but also by GFAP-positive cells, assumed to be glial cells. These original findings warrant further functional investigations aiming at studying the potential role of AQP1 in cell migration and proliferation occurring during the development of PVR and ERM.
Insights
Aquaporin-1 (AQP1) is expressed in proliferative vitreoretinopathy (PVR) and epiretinal membranes (ERM). This water channel protein is found in myofibroblasts and glial cells, suggesting a role in these conditions.
Area of Science:
- Ophthalmology
- Cell Biology
- Molecular Biology
Background:
- Aquaporin-1 (AQP1) is implicated in cell migration and proliferation.
- Proliferative vitreoretinopathy (PVR) and epiretinal membranes (ERM) are conditions characterized by cellular proliferation and migration.
- Understanding the molecular mechanisms underlying PVR and ERM is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the expression of Aquaporin-1 (AQP1) in proliferative vitreoretinopathy (PVR) and epiretinal membranes (ERM).
- To determine the cellular localization of AQP1 within these pathological tissues.
Main Methods:
- Collection of 19 human membranes from PVR and ERM cases following eye surgery.
- Quantitative real-time PCR (RT-qPCR) to assess AQP1 mRNA expression.
- Immunofluorescence staining to evaluate AQP1 protein expression and colocalization with alpha-smooth muscle actin (αSMA) and glial fibrillary acidic protein (GFAP).
Main Results:
- AQP1 mRNA and protein were detected in both PVR and ERM tissues.
- AQP1 protein expression was heterogeneous within and between PVR and ERM samples.
- AQP1 colocalized with αSMA-positive cells (presumed myofibroblasts) and GFAP-positive cells (presumed glial cells), with a higher degree of coexpression with αSMA.
Conclusions:
- This study provides the first evidence of AQP1 expression in PVR and ERM.
- AQP1 is primarily expressed by αSMA-positive myofibroblasts and also by GFAP-positive glial cells in these conditions.
- Further research is warranted to explore the functional role of AQP1 in the pathogenesis of PVR and ERM, particularly in cell migration and proliferation.
