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Xiaoyan Zhu, Lei Li, Lingyun Zou, Xudong Zhu, Guangjun Xian, Haijun Li, Yan Tan, Lin Xie; A Novel Aptamer Targeting TGF-β Receptor II Inhibits Transdifferentiation of Human Tenon's Fibroblasts into Myofibroblast. Invest. Ophthalmol. Vis. Sci. 2012;53(11):6897-6903. doi: 10.1167/iovs.12-10198.
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To isolate aptamers that were bound to the extracellular segment of TGF-β receptor II (TβRII) and evaluate their effect on the TGF-β–induced transdifferentiation of fibroblasts.
TβRII-binding aptamers were screened by Systematic Evolution of Ligands by Exponential Enrichment (SELEX) from a single stranded DNA (ssDNA) library. Human Tenon's fibroblasts (HTFs) were cultured and treated with TGF-β2, TGF-β2 and aptamer S58/68, or aptamer S58/68 alone. Western blot analysis was performed to determine levels of α-smooth muscle actin (α-SMA) and the signaling protein phosphorylated Smad2 (p-Smad2). α-SMA and p-Smad2 subcellular distribution and fibrous actin (F-actin) with rhodamine-phalloidin staining were evaluated by confocal immunofluorescence microscopy. Cell contractility was assessed in collagen gel contraction assays.
Twenty-one sequences were obtained after eight rounds of selection. Two preferential sequences, aptamer S58 and S68, were isolated and used in the following experiments. Aptamer S58 significantly inhibited α-SMA expression and incorporation into actin stress fibers, as induced by TGF-β2. Aptamer S58 also suppressed TGF-β2–induced cell contraction. Furthermore, aptamer S58 inhibited the TGF-β2–induced phosphorylation and nuclear translocation of Smad2. However, we did not find any effect of aptamer S68 on TGF-β2 activity in vitro.
Our study revealed that a novel aptamer binding TβRII inhibited TGF-β2–induced myofibroblast transdifferentiation in HTFs.
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