Inhibitory effects of He-Ne laser repeated irradiation on collagen synthesis in hypertrophic scar-derived fibroblasts in culture

Objective To explore the inhibitory effects of He-Ne laser repeated irradiation on the collagen synthesis of cultured scar fibroblasts. Method Cultured fibroblasts derived from hypertrophic scars(HS) were irradiated with He-Ne laser for 30 minutes at various power densities(10,50,100 and 150 mW/cm2),once a day for 3 consecutive days.In 24 hours after repeated irradiation collagen production and type I procollagen mRNA level of fibroblasts were measured with the incorporation of 3H proline and blot hybridization techniques respectively.Results Collagen synthesis and type I procollagen mRNA level remained unchanged when the laser was irradiated at the power density of 10 mW/cm2 or 50 mW/cm2.Compared with control,collagen synthesis and type I procollagne mRNA level were significantly decreases at the power density of 100 mW/cm2 or 150mW/cm2(P< 0.05).Type I procollagen mRNA level at the power density of 150 mW/cm2 was lower than that at the 100 mW/cm2 (P< 0.05).Conclusion Repeated He-Ne laser irradiation at the power density of 100 mW/cm2 or 150 mW/cm2 can suppress collagen synthesis of cultured fibroblasts in HS.The cause of suppression may be associated with down regulation of type I procollagen mRNA expression.

Expression of integrins in hypertrophic scar-derived fibroblasts

Objective: To gain the knowledge of expression levels of integrins in hypertrophic scar--derived andnormal skin-derived fibroblasts. Methods: Using anti--β1 α1. α2. α3 and a4 integrin McAbs, the expressions ofintegrins were detected in hypertrophic scar--derived and normal skin-- derived fibroblasts of passage 5 and 15 byenzyme--linked immunosorbent assay (ELISA ) technique. ResultS: The hypertrophic scar-- derived fibroblastspossessed higher expression levels of integrin subunits than normal skin--derived fibroblasts. After the cells werecultured from passage 5 to passage 15, the decrease range of integrin expression in hypertrophic scar-derived was5. 94%~18. 26%, and 26. 19% ~ 46. 84% in normal skin- derived fibroblasts, showing a statistical difference(P<0. 01). Conclusion: Overexpression of integrins in hypertrophic scar fibroblasts may play an important rolein the hypertrophic scar formation and contemporaneous tissue contracture.

Effects of the He-Ne laser with various power densities on the growth of cultured fibroblasts in hypertrophic scar

Objective To explore the relationship between power density of He -Ne laser with the growth of fibroblasts in hypertroph ic scar (HS).Methods The cultured fibroblasts in HS were i rradiated with He -Ne laser(Wavelenth 632.8nm),various power densities such as50mW/cm 2 ,100mW/cm 2 and 150mW/cm 2 were respectively adopted once a day for 10minutes.After 1,3and 5times o f He -Ne laser for dose rate irradiation separatedly ,the cell count and cell circle analysis were counted and examined by trypa n blue staining and flow cytometry .Results The amount of cell after 1times of 50mW /cm 2 laser irradiation was markedly more than teh control(P<0.01).The amount of cells after 5times of 100mW/cm 2 ,3and 5times of 150mW/cm 2 laser irradiation was less than the controls(P <0.05).The result of cell circle analysis was corresponded with that of the cell count.Conclusion Both stimualtion and inhibition of He -Ne laser on the growth of scar fibroblasts can be obtained with vario us power densities.Power density of He -Ne laser associates with the effects on the growth of scar fibroblasts.

STUDY ON FUNCTION OF FOCAL ADHENSIVE KINASE AND INTEGRIN α_1 IN HYPERTROPHIC SCAR FIBROBLASTS

Objective To study the function of focal adhesion kinase （FAK） in the formation of hypertrophic scar and its interrelationship with integrin α1. Methods Original fibroblasts from human hypertrophic scar and human normal dermis were cultured, and immunocytochemistry was applied to detect localization of expres- sion of FAK and integrin α1 in hypertrophic scar and human normal skin fibroblasts. The expression of integrin α1 was detected before and after FAK antibody blocking hypertrophic scar fibroblasts （HSFB） 48 h later. Meanwhile the collagen synthesis was evaluated by [^3 H]-proline incorporation and HSFB cell proliferation was measured by MTT method. Results The expression of FAK and integrin aI of hypertrophic scar fibroblasts was higher than that of the normal skin fibroblasts significantly （ P 〈 0.01 ）. The expression of integrin α1 was reduced after FAK being blocked （ P 〈 0.01 ）. Meanwhile the collagen synthesis of human scar-derived fibroblasts by [^3H] -proline incor- poration was depressed respectively （ P 〈 0. 01 ）. The cell proliferation was inhibited by using 1：100 and 1：200 FAK antibody with MTI＂ method （ P 〈 0. 01 ）. Conclusion FAK is the key point of signal transmission pathway mediated by integrin α1 , which regulates protein synthesis of integrin α1 , it may play an important role in the proliferation and constriction of hypertrophic scar. FAK antibody can inhibit the collagen synthesis and cell proliferation of hypertrophic scar fibroblasts.

Experimental study on effect of endothelin in the proliferation and collagen synthesis of human scar-derived fibroblasts

Objective To investigate the role of endothelin(ET) in the proliferation and collagen synthesis of human scar-derived fibroblasts and the moduktion of its antagonists such as nitric oxide(NO), tetrandrine ( Tet). Methods With the cultured fibroblasts from the scarring tissue, the cell pdiferation was determined by[3H]-TdR incorporation, while the collagen synthesis was evaluated by[3H]-proline incorporation. Results The ET-1 was significantly increasing the proliferation and collagen synthesis of human scar-derived fibroblasts. The values of [3H]-TdR absorption in the 2.5 ng/ml,25 ng/ml and 100 ng/ml of ET-1 groups were 1.8 times,4 times and 4.9 times more than in the control group, respectively(P【0. 01),while the values of the [3H]-proline incorporation were 1.1 times,3.1 times and 3.8 times respectively(P【0.01). The fibroblasts, treated with 50 μg/ml of S-nitroso-N-acetyl penicillamine(SNAP), were no detectable effect on the basal level of DNA synthesis,but produced decreasing effect on the

Expression of MMP-3 mRNA in hypertrophic scar fibroblasts and MMP-3 gene transfection

To investigate the molecular mechanism of extracellular matrix overdeposition in hypertrophic scar tissues and to explore MMPs gene therapy for hypertrophic scar. Methods: Hypertrophic scarderived and normal skin-derived fibroblasts were cultured and a recombinant retrovirus vector containing MMP-3 gene was constructed and then transfected into hypertrophic scar fibroblasts. Expressive level of MMP-3 mRNA was detected by dot blotting, and the activity of MMPs was determined by DNP-peptide.Results: Lower expression of MMP-3 mRNA and fewer DNP-peptide hydrolyzed fragments were observed in hypertrophic scar-derived fibroblasts compared with normal skin-derived fibroblasts. Transfection of MMP-3gene into hypertrophic scar-derived fibroblasts could enhance the expression of MMP-3 mRNA (3. 4 fold)and the de novo capacity to hydrolyze DNP-peptide (2. 1 fold). Conclusion: Overdeposition of extracellular matrix in hypertrophic scar tissue was related to low expression of MMP-3 due to its down-degradation of extracellular matrix. MMP-3 gene transfection could be a better way to treat hypertrophic scars by degrading extracellular matrix.

The expression of Cyclin A and p21^(cip1)in fibroblast of hypertrophic scar

Objective To study the relation of the mRNA and protein expression of CyclinA and p21cip1 in different stages hypertrophic scar fibroblast (FB) with its cell cycle,so as to provide theoretical evidence for intervention therapy of

β-谷甾醇对增生性瘢痕成纤维细胞作用机制的网络药理学分析

背景:目前针对增生性瘢痕有效的预防和治疗措施仍然有限。而大多数植物中草药不良反应小且来源丰富,为预防和治疗增生性瘢痕提供了新的思路和方法。目的:通过网络药理学和分子对接技术探讨植物来源β-谷甾醇作用于增生性瘢痕成纤维细胞的潜在分子机制,并通过细胞学实验进行初步验证。方法:通过网络药理学方法,利用相关数据库及软件筛选β-谷甾醇的药物靶点,获取增生性瘢痕相关疾病靶点,取交集得到β-谷甾醇作用于增生性瘢痕的潜在作用(交集)靶点,使用Cytoscape软件和STRING数据库构建“药物-靶点-疾病”网络和蛋白质互作网络(PPI),同时筛选出PPI中核心作用靶点。通过DAVID数据库对交集靶点进行GO生物学功能和KEGG通路富集分析,结合文献分析进一步确立与交集靶点关系密切的信号通路及核心靶点基因,应用AutoDock软件对β-谷甾醇和核心靶点蛋白进行分子对接。采用体外细胞实验验证β-谷甾醇对人增生性瘢痕成纤维细胞增殖、凋亡、细胞周期分布和核心靶点基因mRNA表达的影响。结果与结论:①β-谷甾醇和增生性瘢痕的交集靶点共56个,PPI网络中筛选出10个核心靶点:酪氨酸激酶(SRC)、丝裂原活化蛋白激酶3(MAPK3)、半胱氨酸蛋白酶3(CASP3)、载脂蛋白E(APOE)、雌激素受体1(ESR1)、固醇调节元件结合转录因子1(SREBF1)、过氧化物酶体增殖物激活受体α(PPARα)、C-反应蛋白(CRP)、细胞间黏附分子1(ICAM1)和过氧化氢酶(CAT)。②结合文献报道和KEGG通路、GO功能分析结果,进一步认定MAPK信号通路与交集靶点关系密切,确定MAPK3(即为ERK1-MAPK)、CASP3、P53和肿瘤坏死因子为其核心靶点。③分子对接结果提示β-谷甾醇与核心靶点蛋白结合良好。④细胞实验结果表明,100μmol/L的β-谷甾醇能抑制增生性瘢痕成纤维细胞增殖,降低线粒体膜电位、诱导细胞凋亡(P<0.01),使G1期细胞占比增加,S期细胞占比减少(P<0.05),同时上调CASP3、P53和肿瘤坏死因子mRNA表达(P<0.05),并下调MAPK3 mRNA表达(P<0.001)。⑤上述数据证实,β-谷甾醇可能通过激活肿瘤坏死因子通路,上调CASP3和P53的表达,诱导增生性瘢痕成纤维细胞凋亡,同时抑制ERK-MAPK通路使细胞周期阻滞从而降低增生性瘢痕成纤维细胞增殖活性。

增生性瘢痕差异表达基因及小分子药物预测的生物信息学分析与验证

背景:增生性瘢痕是以成纤维细胞过度增殖、表皮增厚和角质层功能不良为特征的皮肤纤维化疾病,目前其具体发病机制仍不清楚。目的:基于生物信息学筛选增生性瘢痕相关数据集的核心(Hub)基因及重要信号通路,再用细胞实验加以验证,预测对其可能有治疗作用的小分子药物。方法:从基因表达综合数据库搜索增生性瘢痕相关的数据集,通过R软件筛选差异表达基因,对差异表达基因进行基因本体论和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Gnomes,KEGG)富集分析,使用String在线平台构建差异表达基因的蛋白质相互作用网络,然后分别利用Cytoscape软件中的Cytohubba和MCODE插件筛选出蛋白质相互作用网络中的关键基因和核心模块,进一步将上述关键基因和构成核心模块的基因求交集得到Hub基因,通过荧光定量PCR验证Hub基因mRNA在人增生性瘢痕与正常皮肤表皮干细胞中的表达差异,并利用人类蛋白图谱中组织学数据验证Hub基因编码蛋白在2种组织中表达量和分布的差异,最后用connectivity map数据库预测针对增生性瘢痕的潜在作用药物。结果与结论:①筛选出的差异表达基因中上调基因102个、下调基因702个,基因本体论和KEGG分析结果显示,富集的信号通路及生物学过程主要涉及紧密连接、花生四烯酸代谢、细胞外基质受体交互、表皮发育和角质化等;②取交集得到8个Hub基因与调控胆固醇代谢的甲羟戊酸途径密切相关,分别是HMGCS1、DHCR7、MSMO1、FDPS、MVK、HMGCR、MVD和ACAT2;③荧光定量PCR结果显示,相比正常皮肤组,增生性瘢痕组HMGCS1、DHCR7、MSMO1、FDPS、HMGCR、MVD和ACAT2 mRNA的表达均显著下降(P<0.05),而MVK mRNA的表达无明显变化(P>0.05);④除MVK外,其余Hub基因编码蛋白在正常皮肤组织中表达水平均高于增生性瘢痕组织(P<0.05);⑤评分排列前10的候选药物包括蛋白激酶A抑制剂(H-89)、丝氨酸蛋白酶抑制剂(Dabigatran-Etexilate)、FLT3抑制剂(舒尼替尼)等,其中白藜芦醇和β-谷甾醇均为植物来源;⑥提示与甲羟戊酸代谢途径密切相关的Hub基因可能通过调控脂质代谢影响表皮结构与功能,这可能是增生性瘢痕的重要发病机制之一,此次研究筛选的小分子化合物可作为治疗增生性瘢痕的候选药物。

RNA pull-down联合质谱分析lncRNA HSFAS在增生性瘢痕中的作用及机制

背景:课题组前期研究发现,增生性瘢痕特异性长链非编码RNA HSFAS是一种可用于增生性瘢痕诊断的新型生物标志物,但其如何在增生性瘢痕中发挥作用尚不清楚。目的:探讨长链非编码RNA HSFAS在增生性瘢痕中的作用及机制。方法:临床收集3例行增生性瘢痕组织切除手术患者的新鲜增生性瘢痕皮肤组织和增生性瘢痕旁正常皮肤组织标本,应用免疫荧光技术检测两种皮肤组织冰冻切片中长链非编码RNA HSFAS的表达。应用酶消化法体外分离增生性瘢痕皮肤组织与正常皮肤组织原代成纤维细胞,采用qRT-PCR检测细胞中长链非编码RNA HSFAS mRNA表达,通过RNA pull-down联合质谱技术检测与长链非编码RNA HSFAS相互结合的蛋白,利用GO和KEGG分析长链非编码RNA HSFAS参与增生性瘢痕进展的主要功能和通路,通过catRAPID和RPISeq网站分析确定长链非编码RNA HSFAS与蛋白的靶向结合。结果与结论:①与正常皮肤组织相比,增生性瘢痕组织中的长链非编码RNA HSFAS表达升高(P<0.05);与正常皮肤组织来源成纤维细胞相比,增生性瘢痕组织来源成纤维细胞中长链非编码RNA HSFAS mRNA表达升高(P<0.05);②RNA pull-down联合质谱技术明确与长链非编码RNA HSFAS相互结合的蛋白有510个;GO和KEGG分析结果显示:这些蛋白主要涉及RNA剪接和加工、染色体合成和分离、细胞周期等过程,其中涉及RNA剪接和加工的蛋白有支架附着因子B2和DICER1,并且与长链非编码RNA HSFAS的结合分数较高;生物信息学技术分析验证结果显示,长链非编码RNA HSFAS与支架附着因子B2和DICER1蛋白存在相互结合;③结果显示,长链非编码RNA HSFAS可能通过与支架附着因子B2和DICER1蛋白相互结合调控RNA剪接和加工修饰影响基因表达,从而促进增生性瘢痕的发生发展。

miR-192-5p在增生性瘢痕组织及成纤维细胞中的表达及调控

背景:研究表明,miRNAs的表达与肝纤维化、肾纤维化及皮肤纤维化发生有关;并证实在痛风性关节炎中miR-192-5p与表皮调节素存在靶向调控关系。目的:探讨miR-192-5p在增生性瘢痕中的表达及调控作用,并验证miR-192-5p与表皮调节素之间存在靶向调控关系。方法:①在新疆医科大学第一附属医院收集6例增生性瘢痕组织及6例正常皮肤组织,采用qRT-PCR法检测miR-192-5p与表皮调节素mRNA表达。②组织块法获取原代增生性瘢痕成纤维细胞,传代培养至3-6代用于后续实验,实验分为3个组:阴性对照组、miR-192-5p模拟物组和miR-192-5p抑制物组,分别转染对应的序列。采用CCK-8法和EdU试剂盒检测细胞增殖活力,划痕实验检测细胞迁移能力,流式细胞术检测细胞凋亡,qRT-PCR和Western blot法检测表皮调节素、Ⅰ型胶原、Ⅲ型胶原和α-SMA的基因和蛋白表达,生物信息学网站预测miR-192-5p靶点,双荧光素酶实验验证靶向结合。结果与结论:①与正常皮肤组织及其成纤维细胞相比,miR-192-5p和表皮调节素在增生性瘢痕和增生性瘢痕成纤维细胞中均呈高表达(P<0.05或P<0.01);②过表达miR-192-5p后,与阴性对照组比较,细胞增殖能力增强(P<0.05),EdU阳性细胞率增加(P<0.01);抑制miR-192-5p后细胞活力降低(P<0.05),EdU阳性细胞率减少(P<0.05);③过表达miR-192-5p 24 h后,与阴性对照组比较,模拟物组细胞划痕间面积、细胞凋亡率减小(P<0.05),miR-192-5p抑制物组细胞划痕间面积、细胞凋亡率增加(P<0.01);④转染48 h后,miR-192-5p模拟物组表皮调节素mRNA及蛋白水平显著降低、Ⅰ型胶原、Ⅲ型胶原和α-平滑肌肌动蛋白mRNA及蛋白水平显著增高(P<0.05或P<0.01);miR-192-5p抑制物组上述4项指标呈现相反的变化(P<0.05或P<0.01);⑤Targetscan网站预测表皮调节素与miR-192-5p有潜在结合位点;⑥双荧光素酶实验显示,miR-192-5p能够与表皮调节素靶向结合。结果说明:miR-192-5p过表达可降低表皮调节素的表达,二者可能存在负向调控;提示通过调控表皮调节素可能起到抑制增生性瘢痕成纤维细胞增殖的作用。

miR-27a-3p激活MAPK信号通路促进人增生性瘢痕成纤维细胞的增殖

背景:目前多项研究证实了丝裂原活化蛋白激酶信号通路参与了细胞的增殖过程,且miRNA参与增生性瘢痕的发生发展,因此深入探讨了miR-27a-3p和丝裂原活化蛋白激酶信号通路在病理性瘢痕形成中的作用。目的:探究miR-27a-3p通过丝裂原活化蛋白激酶信号通路对人增生性瘢痕成纤维细胞增殖的影响。方法:收集皮肤标本并分别分离出原代成纤维细胞,倒置显微镜观察原代细胞,免疫荧光予以验证;采用qRT-PCR检测miR-27a-3p在组织中的相对表达水平;利用数据库预测miR-27a-3p的靶基因,再将预测的靶基因进行基因本体功能富集分析及京都基因与基因组百科全书生物通路富集分析;设置分组为:空白对照组、阴性对照组、miR-27a-3p过表达组、miR-27a-3p抑制组、miR-27a-3p过表达+p38丝裂原活化蛋白激酶抑制剂组、miR-27a-3p过表达+细胞外信号调节蛋白激酶抑制剂组、miR-27a-3p过表达+c-Jun氨基末端激酶抑制剂组,Western blot检测细胞外调节蛋白激酶、c-Jun氨基末端激酶和p38激酶总量及其磷酸化水平,采用CCK-8法和EdU检测细胞增殖情况。结果与结论:①与正常皮肤成纤维细胞相比,增生性瘢痕成纤维细胞的增殖活性更强(P<0.05),增殖速度也更快(P<0.001);②与正常皮肤相比,miR-27a-3p在增生性瘢痕中呈高表达(P<0.001);③与阴性对照组相比,过表达miR-27a-3p能促进细胞的增殖活性(P<0.001)和增殖水平(P<0.001);④与阴性对照组相比,敲低miR-27a-3p能抑制细胞的增殖活性(P<0.05)和增殖水平(P<0.001);⑤与阴性对照组相比,过表达miR-27a-3p促进细胞外调节蛋白激酶、c-Jun氨基末端激酶和p38丝裂原活化蛋白激酶的磷酸化水平(P<0.05);与阴性对照组相比,敲减miR-27a-3p能抑制细胞外调节蛋白激酶、c-Jun氨基末端激酶和p38丝裂原活化蛋白激酶的磷酸化水平(P<0.05);⑥与miR-27a-3p过表达组相比,细胞外调节蛋白激酶、c-Jun氨基末端激酶和p38丝裂原活化蛋白激酶的特异性抑制剂可逆转miR-27a-3p对成纤维细胞的增殖活性(P<0.01)和增殖水平(P<0.001);⑦提示miR-27a-3p通过激活丝裂原活化蛋白激酶信号通路促进人增生性瘢痕成纤维细胞的增殖。

circ-0030042通过miR-145/PTEN轴调控对增生性瘢痕成纤维细胞增殖及迁移的影响

目的:探讨circ-0030042与人第10号染色体缺失的磷酸酶(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)的相互作用关系,并分析其在增生性瘢痕(Hypertrophic scar,HS)患者中对成纤维细胞增殖与迁移的影响及作用机制。方法:通过circRNA序列和定量聚合酶链反应(PCR技术)检测正常皮肤成纤维细胞(NSFBs)和增生性瘢痕患者成纤维细胞(HSFBs)中circ-0030042的表达。用CCK8检测法检测转染48 h后的HSFBs细胞增殖情况。利用stubRFP-sensGFP-LC3基因转染、流式细胞仪及电子显微镜观察circ-0030042对miR-145/PTEN轴调控VEGF水平的表达。利用生物信息学分析、RNA免疫沉淀、免疫荧光检测等方法,揭示circ-0030042介导HS患者成纤维细胞增殖与迁移的作用机制。结果:circ-0030042在增生性瘢痕中显著上调,过表达时作为VEGF海绵抑制miR-145诱导的成纤维细胞,维持体内稳定性。此外,circ-0030042通过海绵化VEGF水平并阻断其miR-145捕获转录因子(FOXO1)mRNA来影响自噬,而circ-0030042诱导FOXO1的抑制被VEGF水平过表达或circ-0030042结合减少所抵消。过表达circ-0030042对成纤维细胞的增殖抑制与VEGF表达的抑制作用被过表达miR-145部分抵消。结论:干扰circ-0030042通过靶向下调miR-145/PTEN轴进而抑制HSFBs细胞的增殖与迁移,进一步诱导恶性细胞凋亡。

Comparative proteomic analysis of extracellular matrix proteins secreted by hypertrophic scar witb normal skin fibroblasts

The formation of hypertrophic scars (HSs) is a fibroproliferative disorder of abnormal wound healing. HSs usually characterize excessive proliferation of fibroblasts, abnormal deposition of extracellular matrix (ECM) during wound healing, associated with cosmetic, functional, and psychological problems. Owing to the role of ECM proteins in scar formation, we comparatively analyzed matrix proteins secreted by normal skin fibroblasts (NSFs) and HS fibroblasts (HSFs). The acetone-extracted secreted proteins were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), and identified by mass spectrometry (MS). Based on Go annotation of MS data, the profiling of ECM proteins was established and scar-related proteins have been screened out. The functions of several ECM proteins identified by MS have been discussed, such as collagens I, VI, XII, fibronectin, decorin, lumican, and protein procollagen C endopeptidase enhancer 1 (PCPE-1). Among them, the MS result of PCPE-1 was supported by Western blotting that PCPE-1 from HSFs were significantly upregulated than that from NSFs. It is suggested that PCPE-1 could be a potential target for scar treatment. The exploration of scar related proteins may provide new perspectives on understanding the mechanism of scar formation and open a new way to scar treatment and prevention.

Overexpression of miR-101 suppresses collagen synthesis by targeting EZH2 in hypertrophic scar fibroblasts

Background:MicroRNA-101(miR-101)is a tumor suppressor microRNA(miRNA)and its loss is associated with the occurrence and progression of various diseases.However,the biological function and target of miR-101 in the pathogenesis of hypertrophic scars(HS)remains unknown.Methods:We harvested HS and paired normal skin(NS)tissue samples from patients and cultured their fibroblasts(HSF and NSF,respectively).We used quantitative reverse transcriptase polymerase chain reaction(qRT-PCR),fluorescence in situ hybridization(FISH),enzyme-linked immunosorbent assays(ELISA)and Western blot analyses to measure mRNA levels and protein expression of miR-101,enhancer of zeste homolog 2(EZH2),collagen 1 and 3(Col1 and Col3)andα-smooth muscle actin(α-SMA)in different in vitro conditions.We also used RNA sequencing to evaluate the relevant signaling pathways and bioinformatics analysis and dual-luciferase reporter assays to predict miR-101 targets.We utilized a bleomycin-induced fibrosis mouse model in which we injected miR-101 mimics to evaluate collagen deposition in vivo.Results:We found low expression of miR-101 in HS and HSF compared to NS and NSF.Overexpressing miR-101 decreased Col1,Col3 andα-SMA expression in HSF.We detected high expression of EZH2 in HS and HSF.Knockdown of EZH2 decreased Col1,Col3 andα-SMA in HSF.Mechanistically,miR-101 targeted the 3-untranslated region(3UTR)of EZH2,as indicated by the decreased expression of EZH2.Overexpressing EZH2 rescued miR-101-induced collagen repression.MiR-101 mimics effectively suppressed collagen deposition in the bleomycin-induced fibrosis mouse model.Conclusions:Our data reveal that miR-101 targets EZH2 in HS collagen production,providing new insight into the pathological mechanisms underlying HS formation.

A型肉毒毒素基于TGF-β1/MAPK通路抑制增生性瘢痕的体外实验研究

目的研究A型肉毒毒素(Botulinum toxin type A,BTXA)对增生性瘢痕成纤维细胞(Hypertrophic scar fibroblasts,HSFbs)的增殖、迁移、凋亡的作用及细胞因子的变化与信号通路的影响。方法切取增生性瘢痕组织,分离培养成增生性成纤维细胞(HSFbs),通过CCK8法检测不同浓度的BTXA对成纤维细胞增殖的影响,划痕试验观察不同浓度的BTXA对成纤维细胞迁移能力的影响,转化生长因子β1(TGFβ1)刺激体外培养的HSFbs,模拟增生性瘢痕的形成机制,用MAPK通路抑制剂或BTXA参与该过程,蛋白印迹法(Western blot)检测B淋巴细胞瘤-2基因(bcl-2)、人型胶原蛋白(col-1)及P-p38MAPK的表达,明确BTXA对MAPK信号通路的影响。结果与空白对照组比较,不同浓度A型肉毒毒素(BTXA)对增生性瘢痕成纤维细胞的增殖抑制率均升高,并随着浓度的升高而增高,差异有统计学意义(药物浓度在2 u/mL时P<0.05,8 u/mL时P<0.01,该浓度细胞增殖抑制率为59%)。不同浓度的BTXA对增生性成纤维细胞的迁移能力均有抑制作用,随着药物浓度升高而抑制作用增强(8 u/mL时,P<0.01)。BTXA对bcl-2、col-1的表达具有降低作用,BTXA降低P-p38的表达,bcl-2、col-1的表达降低与P-p38表达下降、p38MAPK的磷酸化过程受抑制有关。结论BTXA可通过TGFβ1/p38MAPK信号通路抑制HSFbs的形成。

脂肪干细胞外泌体传递miR-145调控增生性瘢痕成纤维细胞生物学特性的实验研究

目的:探究脂肪干细胞(Adipose-derived stem cells,ADSCs)来源的外泌体(Exosome,Exo)传递miR-145对增生性瘢痕成纤维细胞(hypertrophic scar fibroblasts,HSF)生物学功能的影响。方法:从增生性瘢痕组织中分离培养HSF细胞,从脂肪组织中分离培养ADSCs,流式细胞术检测其表面标记物表达情况;采用含miR-145过表达慢病毒及阴性对照miR-NC慢病毒感染ADSCs,实时荧光定量PCR测定转染效果,并提取各转染组ADSCs上清液中Exo,获得含miR-145过表达的ADSCs来源Exo,利用透射电镜观察其形态、纳米颗粒跟踪分析仪检测粒径分布以及Western blot检测表面标志性蛋白CD63、CD81、CD9和TSG101的表达情况对提取的外泌体进行鉴定;添加外泌体培养HSF细胞,具体分组包括对照组、Exo组、miR-NCExo组、miR-145-Exo组,PKH26荧光标记的ADSC来源的Exos与HSF细胞培养,共聚焦荧光显微镜观察外泌体能否被细胞摄取,EdU检测各组HSF细胞的增殖能力,AnnexinⅤ-FITC/PI法检测各组HSF细胞的凋亡水平,Western blot检测各组细胞内凋亡相关蛋白(cleaved-caspase-3、Bax、Bcl-2)及Ⅰ型胶原、Ⅲ型胶原(COL-Ⅰ、COL-Ⅲ)的蛋白表达水平。结果:成功分离到ADSCs,其表面标志物CD44、CD90及CD105均呈阳性表达;经miR-145过表达的慢病毒转染的miR-145-ADSCs组细胞中miR-145相对表达量升高,差异有统计学意义(P<0.05)。分离到直径约100 nm、呈双层膜结构的杯状或球状以及外泌体标志蛋白CD63、CD81、CD9和TSG101均为阳性表达的ADSCs来源Exo;将ADSCs来源Exo与HSF细胞共培养后,Exo可被HSF细胞摄取,miR-145过表达的ADSCs来源Exo能够明显抑制HSF细胞增殖(P<0.05),促进其凋亡(P<0.05),上调促凋亡蛋白cleavedcaspase-3和Bax的蛋白相对表达量(P<0.05),抑制抗凋亡蛋白Bcl-2及COL-Ⅰ、COL-Ⅲ的蛋白相对表达量(P<0.05)。结论:脂肪干细胞来源的外泌体可通过传递miR-145抑制增生性瘢痕皮肤中成纤维细胞的增殖活性并促进其凋亡,其分子机制可能与上调cleaved-caspase-3和Bax的蛋白表达以及抑制Bcl-2、COL-Ⅰ、COL-Ⅲ的蛋白表达有关。

松萝酸对增生性瘢痕成纤维细胞生物学行为及JNK/MAPK信号通路的影响

目的:探讨松萝酸对增生性瘢痕成纤维细胞(HSFBs)增殖、凋亡、迁移和侵袭的影响,并阐明其对c-Jun氨基末端激酶(JNK)/丝裂原活化蛋白激酶(MAPK)信号通路的调节作用。方法:取对数生长期HSFBs分为对照组、10μmol·L^(-1)松萝酸组、20μmol·L^(-1)松萝酸组和50μmol·L^(-1)松萝酸组,除对照组外,其他各组细胞给予相应浓度松萝酸处理。噻唑蓝(MTT)法检测各组细胞存活率,流式细胞术检测各组细胞凋亡率,Transwell小室实验检测各组细胞侵袭和迁移能力,Western blotting法检测各组细胞中磷酸化JNK(p-JNK)、JNK、B细胞淋巴瘤2(Bcl-2)和Bcl-2相关X蛋白(Bax)蛋白表达水平。结果:MTT法和流式细胞术检测,与对照组比较,10、20和50μmol·L^(-1)松萝酸组细胞存活率均降低(P<0.05),细胞凋亡率均升高(P<0.05);与10μmol·L^(-1)松萝酸组比较,20和50μmol·L^(-1)松萝酸组细胞存活率均降低(P<0.05),细胞凋亡率均升高(P<0.05);与20μmol·L^(-1)松萝酸组比较,50μmol·L^(-1)松萝酸组细胞存活率降低(P<0.05),细胞凋亡率升高(P<0.05)。Transwell小室实验检测,与对照组比较,10、20和50μmol·L^(-1)松萝酸组侵袭细胞数和迁移细胞数均减少(P<0.05);与10μmol·L^(-1)松萝酸组比较,20和50μmol·L^(-1)松萝酸组侵袭细胞数和迁移细胞数均减少(P<0.05);与20μmol·L^(-1)松萝酸组比较,50μmol·L^(-1)松萝酸组侵袭细胞数和迁移细胞数均减少(P<0.05)。Westernblotting法检测,与对照组比较,10、20和50μmol·L^(-1)松萝酸组细胞中Bcl-2蛋白表达水平均降低(P<0.05),Bax和p-JNK蛋白表达水平均升高(P<0.05);与10μmol·L^(-1)松萝酸组比较,20和50μmol·L^(-1)松萝酸组细胞中Bcl-2蛋白表达水平均降低(P<0.05),Bax和p-JNK蛋白表达水平均升高(P<0.05);与20μmol·L^(-1)松萝酸组比较,50μmol·L^(-1)松萝酸组细胞中Bcl-2蛋白表达水平降低(P<0.05),Bax和p-JNK蛋白表达水平均升高(P<0.05)。结论:松萝酸可抑制HSFBs增殖、侵袭和迁移,诱导HSFBs凋亡,并激活JNK/MAPK信号通路。

PTEN介导紫草素抑制人增生性瘢痕成纤维细胞的胶原沉积

目的从PTEN角度探讨紫草素对人增生性瘢痕成纤维细胞胶原沉积的影响。方法苏木精-伊红染色(HE染色)和马松染色(Masson染色)鉴定增生性瘢痕组织,免疫荧光鉴定人增生性瘢痕成纤维细胞(HSFBs);Western blot检测人增生性瘢痕(HS)和同一个体正常皮肤(NS)组织中PTEN表达水平;将HSFBs随机分组为:DMSO组、shikonin组、control组、si-NC组、si-PTEN组、shikonin+si-NC组和shikonin+si-PTEN组;Western blot检测各组中PTEN和胶原相关蛋白(Col1、Col3、α-SMA)的表达。结果与正常皮肤组织相比,PTEN在增生性瘢痕组织中呈低表达(P<0.05);用IC50浓度(13.46μmol/L)的紫草素干预人增生性瘢痕成纤维细胞24 h后,人增生性瘢痕成纤维细胞中Col1、Col3和α-SMA的表达降低(P<0.05),而PTEN的表达升高(P<0.05);转染si-PTEN后,与si-NC组相比,人增生性瘢痕成纤维细胞中Col1,Col3和α-SMA的表达升高(P<0.05);共转染shikonin+si-PTEN后,与shikonin+si-NC组相比,人增生性瘢痕成纤维细胞中Col1、Col3和α-SMA的表达升高(P<0.05)。结论紫草素可通过上调PTEN的表达抑制增生性瘢痕成纤维细胞的胶原沉积。

紫草素调控MicroRNA-382-5p抑制人增生性瘢痕成纤维细胞纤维化

背景:目前已有研究表明紫草素具有治疗增生性瘢痕的潜力,且miRNA参与增生性瘢痕的病理机制调控,猜测紫草素有可能通过影响miRNA调控增生性瘢痕的发生发展。目的:探讨紫草素通过影响MicroRNA-382-5p对人增生性瘢痕成纤维细胞纤维化的作用机制。方法:收集宁夏医科大学总医院烧伤整形外科提供的增生性瘢痕组织及瘢痕旁正常皮肤组织(瘢痕旁3 cm以内),并分别分离出人增生性瘢痕成纤维细胞和正常成纤维细胞用于后续实验。苏木精-伊红染色鉴定正常皮肤和增生性瘢痕;免疫荧光鉴定成纤维细胞;采用实时荧光定量PCR从组织水平检测MicroRNA-382-5p相对表达水平。将增生性瘢痕成纤维细胞随机分为紫草素组(紫草素溶于二甲基亚砜配成浓度为13.46μmol/L的药物干预细胞24 h)、二甲基亚砜组、MicroRNA-382-5p阴性对照组、MicroRNA-382-5p抑制组、紫草素+MicroRNA-382-5p阴性对照组及紫草素+MicroRNA-382-5p过表达组。实时荧光定量PCR检测Ⅰ型胶原蛋白α1、Ⅲ型胶原蛋白α1和α-平滑肌肌动蛋白mRNA表达;Western blot检测Ⅰ型胶原蛋白α1、Ⅲ型胶原蛋白α1和α-平滑肌肌动蛋白的蛋白表达;CCK-8法检测细胞活性;划痕实验检测细胞迁移能力。结果与结论:①与正常皮肤成纤维细胞相比,增生性瘢痕成纤维细胞增殖活性更强(P<0.01);②与二甲基亚砜组相比,紫草素组可以下调增生性瘢痕成纤维细胞中Ⅰ型胶原蛋白α1、Ⅲ型胶原蛋白α1和α-平滑肌肌动蛋白的表达水平(mRNA:P<0.01,蛋白:P<0.01),并抑制增生性瘢痕成纤维细胞迁移(P<0.05);③与正常皮肤相比,MicroRNA-382-5p在增生性瘢痕中呈高表达(P<0.01),且紫草素能下调增生性瘢痕成纤维细胞中MicroRNA-382-5p的表达(P<0.01);④敲低MicroRNA-382-5p能下调增生性瘢痕成纤维细胞中Ⅰ型胶原蛋白α1、Ⅲ型胶原蛋白α1和α-平滑肌肌动蛋白的表达水平(mRNA:P<0.01,蛋白:P<0.01),并抑制增生性瘢痕成纤维细胞迁移(P<0.05);⑤过表达MicroRNA-382-5p能上调在紫草素影响下增生性瘢痕成纤维细胞中Ⅰ型胶原蛋白α1、Ⅲ型胶原蛋白α1和α-平滑肌肌动蛋白的表达水平(mRNA:P<0.01,蛋白:P<0.01),并促进增生性瘢痕成纤维细胞迁移(P<0.01);⑥提示紫草素可通过下调MicroRNA-382-5p的表达抑制增生性瘢痕成纤维细胞的纤维化和迁移。