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• W2060694678 abstract "The barrier integrity of the corneal endothelium, which is conferred by its tight and adherens junctions, is critical for the maintenance of deturgescence of the corneal stroma. Although characteristically leaky, the barrier integrity restricts fluid leakage into the stroma such that the rate of leak does not exceed the rate of the endothelial active fluid transport directed toward the aqueous humor. At a molecular level, the barrier integrity is influenced by the actin cytoskeleton and microtubules, which are coupled to tight and adherens junctions via a variety of linker proteins. Since the cytoskeleton is affected by Rho family small GTPases and p38 MAP kinase, among others, many pathophysiological stimuli induce plasticity to the cytoskeleton and thereby elicit dynamic regulation of the barrier integrity. This review presents an overview of the impact of several bioactive factors on the barrier integrity of the corneal endothelium through altered actin cytoskeleton and/or disassembly of microtubules. The main focus is on the effect of TNF-α (tumor necrosis factor-α) which is a pro-inflammatory molecule found in the intraocular milieu during allograft rejection and anterior uveitis. This cytokine elicits acute activation of p38 MAP kinase, induces disassembly of microtubules, disrupts the peri-junctional actomyosin ring, and concomitantly breaks down the barrier integrity. These effects of TNF-α could be inhibited by stabilizing the microtubules, co-treating with a selective p38 MAP kinase inhibitor, and elevating intracellular cAMP via A2B receptors or direct exposure to forskolin. Overall, the corneal edema following a potential breakdown of the endothelial barrier integrity can be rescued pharmacologically by inhibiting specific cell-signaling mechanisms." @default.
• W2060694678 created "2016-06-24" @default.
• W2060694678 creator A5075822195 @default.
• W2060694678 date "2012-02-01" @default.
• W2060694678 modified "2023-09-26" @default.
• W2060694678 title "Cell signaling in regulation of the barrier integrity of the corneal endothelium" @default.
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• W2060694678 doi "https://doi.org/10.1016/j.exer.2011.09.009" @default.
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