Trichostatin A inhibits transforming growth factor-β-induced reactive oxygen species accumulation and myofibroblast differentiation via enhanced NF-E2-related factor 2-antioxidant response element signaling.
Trichostatin A (TSA) has been shown to prevent fibrosis in vitro and in vivo. The present study aimed at investigating the role of reactive oxygen species (ROS) scavenging by TSA on transforming growth factor-β (TGF-β)-induced myofibroblast differentiation of corneal fibroblasts in vitro. Human immortalized corneal fibroblasts were treated with TGF-β in the presence of TSA, the NAD(P)H oxidase inhibitor diphenyleneiodonium (DPI), the antioxidant N-acetyl-cysteine (NAC), the NF-E2-related factor 2-antioxidant response element (Nrf2-ARE) activator sulforaphane, or small interfering RNA. Myofibroblast differentiation was assessed by α-smooth muscle actin (α-SMA) expression, F-actin bundle formation, and collagen gel contraction. ROS, H(2)O(2), intracellular glutathione (GSH) level, cellular total antioxidant capacity, and the activation of Nrf2-ARE signaling were determined with various assays. Treatment with TSA and the Nrf2-ARE activator resulted in increased inhibition of the TGF-β-induced myofibroblast differentiation as compared with treatment with DPI or NAC. Furthermore, TSA also decreased cellular ROS and H(2)O(2) accumulation induced by TGF-β, whereas it elevated intracellular GSH level and cellular total antioxidant capacity. In addition, TSA induced Nrf2 nuclear translocation and up-regulated the expression of Nrf2-ARE downstream antioxidant genes, whereas Nrf2 knockdown by RNA interference blocked the inhibition of TSA on myofibroblast differentiation. In conclusion, this study provides the first evidence implicating that TSA inhibits TGF-β-induced ROS accumulation and myofibroblast differentiation via enhanced Nrf2-ARE signaling.
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CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL GENE-Y GENE-Y GENE-Y GENE-N CHEMICAL GENE-Y GENE-Y GENE-Y GENE-N GENE-Y GENE-Y GENE-Y GENE-N GENE-Y GENE-N CHEMICAL GENE-Y GENE-N GENE-Y GENE-Y GENE-N GENE-N GENE-Y GENE-N GENE-Y GENE-N CHEMICAL GENE-Y GENE-Y GENE-N GENE-Y CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL
TSA TSA TSA TSA NAD(P)H diphenyleneiodonium DPI N-acetyl-cysteine NAC sulforaphane Trichostatin A H(2)O(2) glutathione GSH TSA Trichostatin A oxygen TGF-β Nrf2 Nrf2 ARE DPI Nrf2 TGF-β Nrf2 ARE transforming growth factor-β TGF-β) TGF-β NAD(P)H oxidase NF-E2-related factor 2 antioxidant response element NAC Nrf2 ARE α-smooth muscle actin α-SMA F-actin collagen Nrf2 ARE Nrf2 ARE TSA TGF-β NF-E2-related factor 2 antioxidant response element transforming growth factor-β H(2)O(2) GSH TSA oxygen TSA