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Argon laser photocoagulation-induced modification of gene expression in the retina
Ann S Wilson1, Bridget G Hobbs, Wei-Yong Shen
1Department of Molecular Ophthalmology, Lions Eye Institute, The University of Western Australia, Nedlands, Australia.
Purpose:
To generate a profile of genes expressed in the retina, RPE, and choroid after laser treatment and to identify genes that may contribute to the beneficial effects of laser photocoagulation in the treatment of angiogenic retinal diseases.
Methods:
Argon laser irradiation was delivered to the left eye of normal C57BL/6J mice (n = 30), with the right eye serving as the control in each animal. Three days after laser treatment, mice were culled, eyes enucleated, and the retinas dissected and pooled into respective groups. The total RNA of replicate samples was extracted, and expression profiles were obtained by microarray analysis. Data comparisons between control and treated samples were performed and statistically analyzed.
Results:
Data revealed that the expression of 265 known genes and expressed sequence tags (ESTs) changed after laser treatment. Of those, 25 were found to be upregulated. These genes represented a number of biological processes, including photoreceptor metabolism, synaptic function, structural proteins, and adhesion molecules. Thus angiotensin II type 2 receptor (Agtr2), a potential candidate in the inhibition of VEGF-induced angiogenesis, was upregulated, whereas potential modulators of endothelial cell function, permeability factors, and VEGF inducers, such as FGF-14, FGF-16, IL-1beta, calcitonin receptor-like receptor (CRLR), and plasminogen activator inhibitor-2 (PAI2), were downregulated.
Conclusions:
In this study, genes were identified that both explain and contribute to the beneficial effects of laser photocoagulation in the treatment of angiogenic retinal diseases. The molecular insights into the therapeutic effects of laser photocoagulation may provide a basis for future therapeutic strategies.
Insights
Laser photocoagulation alters gene expression in the retina, RPE, and choroid. This study identifies key genes, like Agtr2, that may explain the therapeutic benefits for angiogenic retinal diseases.
Area of Science:
- Ophthalmology
- Molecular Biology
- Genetics
Background:
- Angiogenic retinal diseases pose significant challenges in treatment.
- Laser photocoagulation is a common therapeutic modality.
- Understanding the molecular mechanisms underlying laser treatment is crucial.
Purpose of the Study:
- To profile gene expression in the retina, retinal pigment epithelium (RPE), and choroid post-laser treatment.
- To identify genes contributing to the therapeutic effects of laser photocoagulation.
- To elucidate molecular pathways involved in treating angiogenic retinal diseases.
Main Methods:
- Argon laser irradiation was applied to mouse eyes, with contralateral eyes serving as controls.
- Retinal tissues were collected three days post-treatment for RNA extraction.
- Microarray analysis was employed to generate gene expression profiles.
Main Results:
- Gene expression changes were observed in 265 known genes and expressed sequence tags (ESTs).
- Twenty-five genes were upregulated, including angiotensin II type 2 receptor (Agtr2), implicated in inhibiting angiogenesis.
- Several genes involved in endothelial cell function and vascular endothelial growth factor (VEGF) pathways were downregulated.
Conclusions:
- This study identified specific genes that contribute to the beneficial outcomes of laser photocoagulation.
- The identified molecular insights provide a foundation for developing novel therapeutic strategies.
- Understanding these gene expression changes enhances our knowledge of laser photocoagulation's efficacy in angiogenic retinal diseases.