Oleanolic acid regulates the proliferation and extracellular matrix of keloid fibroblasts by mediating the TGF-β1/SMAD signaling pathway

Background

Keloid (KD) is a unique pathological fibroproliferative disease that seriously affects the appearance of patients. This study investigated the effect of oleanolic acid (OA) on the proliferation of keloid fibroblasts (KFs) and the expression of extracellular matrix (ECM)-related proteins.

Methods

The proliferation of KFs was evaluated using an MTT assay. The effects of OA on intra- and extracellular levels of fibronectin (FN), procollagen I, matrix metalloproteinase-1 (MMP-1), and α-smooth muscle actin (α-SMA) were evaluated using Western blotting. To simulate the KD microenvironment, TGF-β1 was added to the serum-free culture medium, and KFs were incubated with TGF-β1 and OA for 24 h. The intra- and extracellular levels of the ECM-related proteins and the effect of OA on TGF-β1-induced phosphorylation of the SMAD2 and SMAD3 proteins were evaluated using Western blotting.

Results

OA inhibited the proliferation of KFs in a concentration- and time-dependent manner. Furthermore, OA treatment of KFs reduced the intra- and extracellular levels of FN, procollagen I, and α-SMA and increased those of MMP-1. OA also reduced TGF-β1-induced increases in the intra- and extracellular levels of FN, procollagen I, and α-SMA and increased the levels of the MMP-1 protein. Additionally, OA significantly reduced TGF-β1-induced phosphorylation of SMAD2 and SMAD3 in KFs.

Conclusions

OA inhibited KF proliferation and reduced ECM deposition through the TGF-β1/SMAD pathway, which suggests that OA may be an effective drug for the prevention and treatment of KD.     

犀地凉血方通过LncRNA NEAT1/miR-485-5p/STAT3调控网络对HaCaT细胞增殖、凋亡影响的研究

目的探讨犀地凉血方对HaCaT细胞LncRNA NEAT1/miR-485-5p/STAT3调控网络及细胞增殖、凋亡的影响。方法以IL-17诱导的HaCaT细胞为研究对象, 通过qPCR、Western印迹法检测LncRNA NEAT1、miR-485-5p、STAT3 mRNA和蛋白在HaCaT细胞和正常人表皮角质形成细胞(NHEK细胞)中的表达。采用荧光原位杂交技术(FISH)观察LncRNA NEAT1、miR-485-5p在HaCaT细胞中的表达;采用双萤光素酶报告基因实验验证LncRNA NEAT1、miR-485-5p、STAT3之间的靶向调控关系。犀地凉血方煎煮取汁给予大鼠灌胃后采集含药血清, 以含药血清干预和/或LncRNA-NEAT1过表达载体转染HaCaT细胞, 将HaCaT细胞分对照组、过表达LncRNA NEAT1组、犀地凉血方组、犀地凉血方+过表达LncRNA NEAT1组, 采用qPCR、Western印迹法、流式细胞仪、CCK8等实验技术分别检测LncRNA NEAT1、miR-485-5p、STAT3表达及细胞增殖、凋亡情况。采用独立样本t检验、单因素方...