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Heping Xu, Mei Chen, John V. Forrester, Noemi Lois; Cataract Surgery Induces Retinal Pro-inflammatory Gene Expression and Protein Secretion. Invest. Ophthalmol. Vis. Sci. 2011;52(1):249-255. doi: 10.1167/iovs.10-6001.
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To investigate the effect(s) of cataract surgery on the expression of pro-inflammatory genes and proteins in the retina using an experimental rodent model.
An extracapsular lens extraction was performed in one eye of C57BL/6 mice (n = 24); the contralateral unoperated eyes (n = 24) as well as eyes from unoperated animals (n = 9) served as controls. The neurosensory retina and retinal pigment epithelium (RPE)/choroid were collected postoperatively. Expression of genes involved in the acute inflammatory/injury response, including IL-1β, fibroblast growth factor, transforming growth factor β, chemokine CCL2, SDF-1, and complements C3, C4, and factor B (CFB), were examined by real-time PCR and, selectively, by immunohistochemistry.
The expression of IL-1β and CCL2 genes was markedly upregulated (>20-fold, P < 0.01) in the neurosensory retina 30 minutes postoperatively and maintained for the 2-week postoperative period of observation; IL-1β expression was also upregulated in RPE/choroid. The expression of complement C3 (>5-fold) and CFB (>30-fold) genes in the neurosensory retina was also significantly upregulated (P < 0.01 in both cases). Increased IL-1b, CCL2, and CFB as well as enhanced C5b-9 immunostaining were observed by confocal microscopy.
In rodents, lens extraction elicited an acute pro-inflammatory gene and protein response in the posterior segment of the eye, indicating induction of the inflammasome as well as complement activation, as occurs in the “danger” response. A similar response in humans might explain the pathogenesis of cataract surgery–associated retinal complications such as cystoid macular edema.
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