17β-estradiol inhibits TGF-β-induced collagen gel contraction mediated by human Tenon fibroblasts via Smads and MAPK signaling pathways

AIM:To investigate the impact of 17β-estradiol on the collagen gels contraction(CGC)and inflammation induced by transforming growth factor(TGF)-βin human Tenon fibroblasts(HTFs).METHODS:HTFs were three-dimensionally cultivated in type I collagen-generated gels with or without TGF-β(5 ng/mL),17β-estradiol(12.5 to 100μmol/L),or progesterone(12.5 to 100μmol/L).Then,the collagen gel diameter was determined to assess the contraction,and the development of stress fibers was analyzed using immunofluorescence staining.Immunoblot and gelatin zymography assays were used to analyze matrix metalloproteinases(MMPs)and tissue inhibitors of metalloproteinases(TIMPs)being released into culture supernatants.Enzyme-linked immunosorbent assay(ELISA)and reverse transcription-quantitative polymerase chain reaction(RT-PCR)were used to detect interleukin(IL)-6,monocyte chemoattractant proteins(MCP)-1,and vascular endothelial growth factor(VEGF)in HTFs at the translational and transcriptional levels.The phosphorylation levels of Sma-and Mad-related proteins(Smads),mitogen-activated protein kinases(MAPKs),and protein kinase B(AKT)were measured by immunoblotting.Statistical analysis was performed using either the Tukey-Kramer test or Student’s unpaired t-test to compare the various treatments.RESULTS:The CGC caused by TGF-βin HTFs was significantly inhibited by 17β-estradiol(25 to 100μmol/L),and a statistically significant difference was observed when comparing the normal control group with 17β-estradiol concentrations exceeding 25μmol/L(P<0.05).The suppressive impact of 17β-estradiol became evident 24h after administration and peaked at 72h(P<0.05),whereas progesterone had no impact.Moreover,17β-estradiol attenuated the formation of stress fibers,and the production of MMP-3 and MMP-1 in HTFs stimulated by TGF-β.The expression of MCP-1,IL-6,and VEGF mRNA and protein in HTFs were suppressed by 100μmol/L 17β-estradiol(P<0.01).Additionally,the phosphorylation of Smad2 Smad3,p38,and extracellular signal-regulated kinase(ERK)were downregulated(P<0.01).CONCLUSION:17β-estradiol significantly inhibits the CGC and inflammation caused by TGF-βin HTFs.This inhibition is likely related to the suppression of stress fibers,inhibition of MMPs,and attenuation of Smads and MAPK(ERK and p38)signaling.17β-estradiol may have potential clinical benefits in preventing scar development and inflammation in the conjunctiva.

Triptolide inhibits TGF-β-induced matrix contraction and fibronectin production mediated by human Tenon fibroblasts

AIM： To determine if triptolide influences the contractility and fibronectin production in human Tenon fibroblasts（HTFs）. METHODS： HTFs were cultured in type I collagen gels with or without transforming growth factor beta（TGF-β） and/or triptolide. The diameter of the collagen gel was used to measure contraction. Immunoblot analysis was used to quantify myosin light chain（MLC） phosphorylation and integrin expression. Laser confocal fluorescence microscopy was used to monitor the formation of actin stress fibers. Fibronectin production was measured with an enzyme immunoassay. RESULTS： Triptolide inhibition of contraction in TGF-β-induced collagen gel mediated by HTFs was dosedependent and statistically significant at 3 nmol/L（P〈0.05） and maximal at 30 nmol/L and significantly time dependent at 2 d（P〈0.05）. Triptolide reduced TGF-β-induced expression of integrins α5 and β1, phosphorylation of MLC, and formation of stress fibers in HTFs. Furthermore, the inhibition of triptolide on the attenuated TGF-β-induced production of fibronectin by HTFs was concentration-dependent and significant at 1 nmol/L（P〈0.05） and maximal at 30 nmol/L. CONCLUSION： Triptolide suppress the contractility of HTFs induced by TGF-β and the production of fibronectin by these cells. It is promising that triptolide treatment may possibly inhibit scar formation after glaucoma filtration surgery.

Interference of Y-27632 on the signal transduction of transforming growth factor beta type 1 in ocular Tenon capsule fibroblasts

AIM: To investigate the interfering effect of Y-27632, a ROCK-I selective inhibitor, on the signal transduction pathway of transforming growth factor-beta 1 (TGF-beta 1) in ocular Tenon capsule fibroblasts (OTFS) in vitro. METHODS: After OTFS from passages 4 to 6 47 vitro were induced by TGF-beta 1 and then treated by Y-27632, the changes of the OTFS cell cycles were analyzed via flow cytometry, and the proteins expression of the alpha -smooth muscular actin (alpha -SMA), connective tissue growth factor (CTGF), collagen I were calculated by Western blot. After OTFS treated by the different concentrations of Y-27632, the expression levels of the alpha -SMA, CTGF and collagen I mRNA were assayed by RT-PCR. RESULTS: Y-27632 had no markedly effect on the OTFS cell cycles. After treated by TGF-beta 1, OTFS in G1 period significantly increased. The cell cycles distribution by both TGF-beta 1 and Y-27632 had no remarkable difference from that in control group. Y-27632 significantly inhibited the proteins expressions of both alpha -SMA and CTGF, while to some extent inhibited that of collagen I. TGF-beta 1 significantly promoted the proteins expressions of alpha -SMA, CTGF and collagen I. After OTFS treated by both TGF-beta 1 and Y-27632, of alpha -SMA, the protein expression was similar with that in control group (P=0.066>0.05), but the protein expression of CTGF or collagen I, respectively, was significantly different from that in control group (P=0.000<0.01). The differences of expressions of the alpha -SMA, CTGF and collagen I mRNA in 30, 150, 750 mu mol/L Y-27632 group were statistically significant, compared with those in control group, respectively (alpha -SMA, P=0.002, 0.000, 0.000; CTGF, P=0.014, 0.002, 0.001; collagen I,P=0.003, 0.002, 0.000). CONCLUSION: Blocking the Rho/ROCK signaling pathway by using of Y-27632 could inhibit the cellular proliferation and the expression of both CTGF and alpha -SMA whatever OTFS induced by TGF-beta 1 or not. Y-27632 suppressed the expression of collagen I mRNA without induction.

Effect of Apigenin on Gap Junctional Intercellular Communication in Human Tenon's Capsule Fibroblasts

Purpose:To investigate the effect of apigenin on gap junctional intercellular communication (GJIC) in human Tenon's capsule fibroblasts (HTFs) and its underlying mechanism. Methods:After a 48 h treatment of cultured HTFs with apigenin.(80 μmol/L),the GJIC was detected by a scrape-loading/dye transfer technique with Lucifer yellow dye and rhodamine (Rh) dextran. The coupling index represents a quantification of GJIC where a high coupling index is associated with a greater number of cells demonstrating cell-cell communication through gap junction channels.The changes in connexin 43 (Cx43) distribution and the expression of Cx43 at the protein and mRNA levels were statistically compared between the two groups by means of immunocytochemistry, western blotting,and real-time polymerase chain reaction (PCR). Results:The functioning of GJIC in the HTFs was significantly enhanced after 48 hours by apigenin treatment when compared with the control cells. In the apigenin group, the intercellular dye transfer grade was above 9, while this value was only grade 3-4 in the control group. The coupling index was significantly increased up to 9.205±0.3621 in the apigenin group,compared with 5.1775 ±0.3177 in the control group (F=279.581, P=0.000). The expression of Cx43 at the protein and mRNA levels was significantly up-regulated in the apigenin group compared with the control group. Conclusion:Apigenin can significantly enhance the function of GJIC in HTFs by up-regulating the expression of Cx43 at both the protein and mRNA levels,suggesting that the enhancement of GJIC in HTFs by apigenin probably acts as an important mechanism underlying the inhibitory effect of apigenin on HTF proliferation.

Inhibitive effect of TAK-242 on Tenon’s capsule fibroblasts proliferation in rat eyes

AIM: To study the inhibition effect of TAK-242 on the proliferation of rat eye Tenon's capsule fibroblasts via the toll-like receptor 4(TLR4) signaling pathway.METHODS: SD rat Tenon's capsule fibroblasts were extracted and cultured, then the cells were divided into normal control group, lipopolysaccharide(LPS) group(10 g/m L LPS) and TAK-242 group(1 μmol/L TAK-242, and 10 μg/m L LPS after 30 min). The expressions of TLR4, transforming growth factor-β1(TGF-β1) and interleukin-6(IL-6) in each group were detected by Western blot and reverse transcriptase-polymerase chain reaction(RT-PCR). Cell proliferation was detected by cell counting kit-8(CCK-8).RESULTS: Double immunofluorescent labeling in the extracted cells showed negative keratin staining and positive vimentin staining. Western blot showed that the LPS group had the highest expression of TLR4 and TGF-β1(P<0.01). Enzyme linked immunosorbent assay(ELISA) also showed that the secretion of IL-6 was the highest in LPS group(P<0.01). But there was no significant difference in TLR4 and TGF-1, as well as IL-6 expressions between the TAK-242 group and the normal control group(P>0.05). RT-PCR showed that the IL-6 m RNA expression in LPS group was the highest in the three groups(P<0.01). CONCLUSION: TAK-242 inhibits the proliferation of LPSinduced Tenon's capsule fibroblasts and the release of inflammatory factors by regulating the TLR4 signalingpathway, providing a new idea for reducing the scarring of the filter passage after glaucoma filtration surgery.

Anti-scarring effects of butaprost on human subconjunctival Tenon's fibroblasts

AIM： To investigate the toxicity of the E-prostanoid 2（EP2） receptor agonist, butaprost against human subconjunctival（Tenon＇s capsule） fibroblasts, and to determine the underlying mechanism. METHODS： We isolated Tenon＇s fibroblasts from the subconjunctival area of healthy subjects and evaluated the types of EP receptors expressed using quantitative realtime reverse transcription polymerase chain reaction（RTPCR）. The toxicity of butaprost against the fibroblasts was evaluated using methyl thiazolyl tetrazolium and lactic dehydrogenase assays. The inhibition of conjunctival fibroblast proliferation by butaprost was assessed by measuring α-actin levels. The underlying mechanism was assessed by measuring intracellular cyclic adenosine monophosphate（c AMP） levels. Intergroup differences were statistically analyzed using an independent t-test. Densitometry of the Western blot bands was performed using the Image J software. RESULTS： Quantitative real-time RT-PCR revealed that the fibroblast EP2 receptor levels were higher than those of the other EP receptors. Butaprost did not show toxicity against Tenon＇s tissue, but inhibited conjunctival fibroblast proliferation by reducing collagen synthesis. EP2 receptor activation enhanced the c AMP cascade, which might be an important mechanism underlying this effect.CONCLUSION： Butaprost effectively reduces the subconjunctival scarring response. Given the significanceof wound healing modulation in blebs, butaprost＇s inhibitory effect on subconjunctival Tenon＇s fibroblasts may be beneficial in managing postoperative scarring in glaucoma surgery.

Bifunctional Effect of Human IFN-γ on Cultured Human Fibroblasts from Tenon's Capsule

Purpose:To study the effect of human IFN-γon in vitro cultured human fibroblasts form Tenon's capsule.Materials and methods:The effect of different concentrations of human INF-γand mitomycin-C(MMC),5-fluorouracil(5-Fu）on cultured human Tenon's capsule fibroblasts(HTCF)was measured using a MTT[3-(4,5-dimethylthiazo-2-yl)]-2,5-diphenyltetrazolium bromide;Thiazolyl blue)colorimetric assay,The results were analyzed using ANOVA of the statistical package for social sciences(SPSS)9.0 version.The difference was considered to be significant if P<0.05.Results:The effects of MMC and 5-Fu on the growth of HTCF were negative,while the effects of IFN-γon the growth of HTCF were both negative(10^2-10^4units/ml in two experiments)and positive(10^6,10^5,10units/ml in two experiments).The inhibition rate of MMC ranged from5.73%to46.9%,which was similar to the inhibition rate of 5-Fu ranged from12.49%to38.92%(P=0.351),The inhibition rate of IFN-γin two experiments was smaller than MMC and 5-Fu(P<0.05).Conclusion:IFN-γhas bifunctional effect(both enhancement and inhibition)on proliferation of cultured HTCF,The antiproliferative effect of IFN-γwas weatker than MMCand 5-FU,Further study has to bd carride out to document the inhibition of scar formation of filtration bleb by IFN-γand the molecular mechanisms of its bifunctional effect on HTCF proliferation.Eye Science2000;16:43-47.

EW-7197对TGF-β1诱导人Tenon囊成纤维细胞增殖和迁移的影响及机制

目的:探讨ALK5抑制剂EW-7197对转化生长因子β1(TGF-β1)诱导的人Tenon囊成纤维细胞(HTFs)增殖和迁移的影响及其机制。方法:采用MTS法检测细胞增殖率,并摸索EW-7197最佳的作用浓度和作用时间。之后将细胞分为3个组,分别为正常对照组、TGF-β1诱导组和TGF-β1+EW-7197处理组,采用Transwell小室观察各组细胞迁移情况,采用Western blot检测各组细胞Fibronectin、α-SMA、p-Smad2、p-Smad3的蛋白表达水平。结果:MTS结果显示,不同处理条件的EW-7197以6.0μmol/L作用24h的细胞增殖率最低(均P<0.01)。Transwell小室实验结果显示,TGF-β1诱导组的细胞迁移数量为228.0±17.0个/视野,明显高于正常对照组(149.0±15.0个/视野)和TGF-β1+EW-7197处理组(46.0±8.0个/视野)(均P<0.01)。Western blot检测结果显示,TGF-β1诱导组细胞中Fibronectin、α-SMA、p-Smad2、p-Smad3相对表达量高于正常对照组和TGF-β1+EW-7197处理组(均P<0.001)。结论:EW-7197能够通过TGF-β/Smad信号通路抑制TGF-β1诱导的HTFs增殖和迁移。

转化生长因子-β2诱导人Tenon囊成纤维细胞转化及其在瘢痕形成中的作用

背景研究表明转化生长因子-β2（TGF-β2）能够促进瘢痕形成，但其在青光眼滤过术后局部瘢痕形成中的作用机制值得研究。目的探讨TGF-β2对人Tenon囊成纤维细胞（HTFs）转化以及在滤过术后瘢痕形成中的作用。方法在斜视手术中获取3例患者的Tenon囊组织，并用组织块培养法在含质量分数10％胎牛血清的DMEM中培养，培养的细胞贴壁后达到70％～80％亚融合状态时更换为无血清培养基饥饿培养24h，然后分别加入质量浓度1、2、5、10、20Ixg／LTGF-β2诱导HTFs24h，另用2tzg／L或5μg／LTGF-β2 诱导HTFs6、24、48、72h，阴性对照组培养基中不加TGF-β2 用Westernblot法检测HTFs中α-平滑肌肌动蛋白（n—SMA）和pSmad2蛋白的表达，采用细胞免疫荧光技术检测“-SMA及纤维状肌动蛋白（F—actin）表达的定位，采用凝胶收缩实验检测培养细胞收缩力的变化。结果不同质量浓度TGF—B，组HTFs中0I—SMA表达的强度均明显强于阴性对照组，2tzg／L、5μg／LTGF—B，作用24～48h后HTFs中d—SMA表达强度达峰值，10μg／L、20μg／LTGF-β2组较2μg／L、5μg／LTGF-β2组α—SMA蛋白表达强度减弱。对照组HTFs中有少量α—SMA及F—actin表达，1、2、5μg／LTGF-β2组d—SMA及F—actin荧光表达明显增强，阳性细胞数明显增加，10μg／LTGF-β2组α—SMA及F-actin荧光表达较低质量浓度组减弱。2μg／LTGF-β2作用后pSmad2表达强度明显强于PBS组和FBS组，在作用后30rain～2h表达较强，2h后开始出现下降。对照组HTFs收缩凝胶面积所占原面积的百分数为（78．00-3．13）％，1、2、5、10tzg／LTGF-β2组分别为（63．88±1．78）％、（20．69±O．65）％、（19．49±O．54）％、（16．24~0．84）％，HTFs收缩凝胶面积占原面积的百分数随着TGF-β2质量浓度的增加而明显增加（F组别=859．400，P=0．000）。结论TGF-β2可诱导成纤维细胞转分化，一定程度上其作用呈质量浓度依赖性和时间依赖性，且细胞收缩力随质量浓度的增加而增强，可能是青光眼滤过术后滤过通道建立失败的重要机制。

TGF-β_1对Tenon’s囊成纤维细胞增殖和结缔组织生长因子表达的影响

目的研究转化生长因子β1(TGFβ1)对Tenon’s囊成纤维细胞增殖和诱导表达结缔组织生长因子(CTGF)的影响。方法用MTT法检测不同质量浓度TGFβ1(0、0.1、1、10ng/mL)对Tenon’s囊成纤维细胞增殖的影响;免疫细胞化学染色法检测不同质量浓度TGFβ1(0、0.1、1、10ng/mL)对Tenon’s囊成纤维细胞诱导表达CTGF的影响。结果GFβ1能够剂量依赖性地促进Tenon’s囊成纤维细胞增殖(P<0.05);TGFβ1能够促进CTGF的表达,有随质量浓度的增加而增强的趋势(P<0.05),但1ng/mL和10ng/mLTGFβ1组之间无统计学差异(P>0.05)。结论GFβ1能够促进Tenon’s囊成纤维细胞增殖,并促进其下游介质CTGF的表达,可能是青光眼滤过术后滤过泡瘢痕形成的重要机制。

人眼Tenon囊成纤维细胞体外培养及生长特性的比较

目的观察在相同培养条件下不同组织来源的人眼Tenon囊成纤维细胞的生长特性,探讨不同组织来源对细胞培养的影响。方法分别取正常人、青光眼患者及翼状胬肉患者Tenon囊组织,均采用组织块贴壁法培养成纤维细胞,用含10%胎牛血清的DMEM培养基,于相同培养条件下进行离体培养,倒置显微镜下观察细胞生长情况并拍照记录,分别取传代第3、4、5代的成纤维细胞,于接种后第3天行MTT试验检测细胞增殖活力。结果青光眼组、翼状胬肉组较正常人组Tenon囊成纤维细胞离体培养细胞生长无明显差异,培养细胞2 d至6 d处于对数生长期。结论青光眼、翼状胬肉患者Tenon囊组织离体培养成纤维细胞的生长及增殖特性较正常人无明显差异,提示对相关疾病的研究及药物治疗的评价应以体内实验为主要参考,才能准确进行评估。

小檗胺抑制兔Tenon囊和滤过道内成纤维细胞增殖的实验研究

目的:研究钙调素拮抗剂小檗胺(berbamine,BER)对兔Tenon囊成纤维细胞和兔小梁切除术后滤过道内成纤维细胞增殖的抑制作用。方法:体外培养兔Tenon囊成纤维细胞,经不同浓度BER处理不同时间后,细胞计数Kit8(CCK8)法检测BER对兔Tenon囊成纤维细胞增殖的抑制作用,流式细胞仪检测其凋亡率及细胞周期的变化。HE染色检测BER对兔小梁切除术后滤过道内成纤维细胞增殖的抑制作用。结果:兔Tenon囊成纤维细胞经不同浓度BER处理不同时间后细胞增殖受到抑制,并呈时间剂量依赖性。流式细胞仪检测发现BER处理后兔Tenon囊成纤维细胞呈现G1期阻滞,细胞凋亡率明显增加,20mg/LBER处理9h,细胞凋亡率从0.64%增加到31.86%。HE染色显示BER显著抑制兔小梁切除术后滤过道内成纤维细胞的增殖。结论:小檗胺在体内外均能抑制成纤维细胞的增殖,其可能是通过诱导细胞凋亡方式抑制兔Tenon囊和滤过道内成纤维细胞的增殖。

重组γ-干扰素作用人Tenons囊成纤维细胞体外研究

目的 体外研究人重组γ－干扰素对人Ｔｅｎｏｎｓ囊成纤维细胞作用。方法 以人Ｔｅｎｏｎｓ囊成纤维细胞作为实验对象，分别加入０．１～１０＾６ Ｕ／ｍｌ人重组γ－干扰素（ＩＦＮ－γ）、０．００１～１０ｍｇ／Ｌ丝裂霉素（ＭＭＣ）、０．１～１０３ｍｇ／Ｌ５－氟尿嘧啶（５－Ｆｕ）孵育４８ｈ，然后以ＭＴＴ法进行检测。结果 高浓度和低浓度ＩＦＮ－γ实验组ＯＤ值较对照组升高（Ｐ〈０．０５）。

人Tenon囊成纤维细胞的体外培养及增殖能力研究

目的:离体培养人Tenon囊成纤维细胞(HTF)并观察细胞增殖能力。方法:取斜视患者手术切除Tenon囊组织进行成纤维细胞原代培养,培养的细胞通过免疫荧光染色法进行鉴定。CCK-8法描述细胞生长曲线,测定细胞活力。流式细胞术分析细胞周期,计算增殖指数。结果:通过组织块法成功培养出HTF。不同代次原代培养的HTF之间增殖能力无明显统计学差异(P>0.05)。结论:HTF在体外易于培养,经过数次传代,增殖能力稳定,是进行Tenon囊抗纤维化研究的良好靶细胞。

人Tenon's囊成纤维细胞的离体培养及生长特性观察

目的离体培养人Tenon′s囊成纤维细胞,观察其生长特性。方法将人Tenon′s囊成纤维细胞进行离体培养及生长抑制实验,采用含10%胎牛血清的DMEM培养基,细胞计数法及MTT法描述细胞生长曲线。并通过免疫组织化学法对细胞进行鉴定。结果人Tenon′s囊成纤维细胞离体培养48 h至7 d处于对数生长期。细胞角蛋白染色阴性,波蛋白染色阳性。结论人Tenon′s囊成纤维细胞在体外易于生长,是细胞离体实验研究的良好材料。

特异性转化生长因子-β_2 shRNA对人眼Tenon囊成纤维细胞的抑制作用

目的观察转化生长因子-β2(TGF-β2)特异性短发夹RNA(shRNA)对人眼Tenon囊成纤维细胞(TCFs)TGF-β2表达的影响及对人TCFs增生的抑制作用。方法根据小干扰RNA(siRNA)的设计原则,针对TGF-β2基因序列特征构建特异性shRNA载体,转染培养的人TCFs。MTT比色法检测细胞的增生情况;ELISA法检测shRNA对TGF-β2蛋白表达的抑制作用。结果 TGF-β2shRNA转染组的细胞增生及TGF-β2蛋白的表达均受到抑制。转染24、48、72h后MTT比色法检测显示,TGF-β2shRNA转染组培养的Tenon囊的成纤维细胞的增生值分别为0.5426±0.05、0.5210±0.03、0.4055±0.04,明显低于阴性对照组的0.5655±0.03、0.5378±0.03、0.5268±0.04,3个组和各时间点的总体差异均有统计学意义(F组=54.691,P=0.000;Ftime=66.888,P=0.000)。ELISA法检测显示,TGF-β2shRNA转染组TGF-β2蛋白的表达水平下降,24、48、72hTGF-β2蛋白的表达量分别为(543.58±25.32)、(400.26±30.74)、(202.72±23.24)ng/L,明显低于阴性对照组的(659.78±20.95)、(547.45±24.65)、(442.87±17.43)ng/L及空白组的(721.75±30.19)、(756.61±30.19)、(787.60±18.37)ng/L,3个组和各时间点的总体差异均有统计学意义(F组=163.082,P=0.000;F时间=31.498,P=0.000)。结论 TGF-β2特异性shRNA能显著抑制人TCFsTGF-β2的表达,载体介导的TGF-β2特异性shRNA对眼前节术后的抗瘢痕化治疗具有潜在的可能性。

汉防己甲素抑制人眼Tenon囊成纤维细胞的凋亡效应

目的研究汉防己甲素(Tet)抑制人眼Tenon囊成纤维细胞(TCFs)的凋亡效应。方法用组织块混合消化液培养法体外培养人眼TCFs,并对培养的传代细胞进行形态学鉴定。通过透射电镜、TUNEL法和流式细胞仪观察Tet抑制人眼TCFs的凋亡作用。结果人眼TCFs体外生长良好。透射电镜下见Tet处理后的人眼TCFs细胞质固缩,呈现凋亡表现;TUNEL法可见Tet组出现大量的阳性凋亡细胞;流式细胞仪检测TCFs经Tet作用后G0/G1期细胞减少22.2%,S期细胞增加20.53%,G2/M期细胞增加1.6%,Tet抑制TCFs细胞周期于G1期,Tet组凋亡率明显高于对照组(P=0.000)。结论Tet可以诱导人眼TCFs发生凋亡,进而发挥其抑制增生的作用。

汉防己甲素对人眼Tenon囊成纤维细胞中bax、bcl-2、TGF-β2 mRNA表达的影响

目的观察汉防己甲素(Tet)对体外培养的人眼Tenon囊成纤维细胞(tenon's capsule fibroblasts,TCFS)中bax、bcl-2、转化生长因子-β2(TGF-β2)mRNA表达的影响,探讨其可能的作用机制。方法将体外培养的第3代TCFS分别置于浓度为10-5mol/LTet的培养液和1640培养液中培养48 h,采用实时荧光定量PCR检测细胞中bax、bcl-2和TGF-β2 mRNA的表达变化。结果同对照组比较,Tet实验组中bax mRNA的表达量明显升高,bcl-2、TGF-β2 mRNA的表达量显著下降,差异均有统计学意义(P<0.05)。结论一定浓度的汉防己甲素可以通过降低bcl-2、TGF-β2 mRNA的表达量,同时提高bax mRNA的表达量来抑制TCFS的增殖,并可诱导其凋亡,可能成为一种潜在的抗青光眼滤过瘢痕药物。

K115对TGF-β1诱导的人Tenon囊成纤维细胞增殖和迁移的影响及其机制

目的探讨K115对转化生长因子-β1(TGF-β1)诱导的人Tenon囊成纤维细胞增殖和迁移的影响及其机制。方法人Tenon囊成纤维细胞取自于河北省人民医院眼科行青光眼手术的患者。采用CCK-8实验检测K115对人Tenon囊成纤维细胞增殖的影响,筛选出TGF-β1对细胞增殖最佳作用浓度为5.0μg·L^(-1),最佳作用时间为24 h;K115对细胞增殖起始作用浓度为5.0μmol·L^(-1),最佳作用浓度为10.0μmol·L^(-1)。依据这两个浓度进行分组,分别是对照组(不加TGF-β1与K115),TGF-β1组(加5.0μg·L^(-1) TGF-β1),TGF-β1+5.0μmol·L^(-1) K115组(加5.0μg·L^(-1)TGF-β1和5.0μmol·L^(-1)的K115),TGF-β1+10.0μmol·L^(-1) K115组(加5.0μg·L^(-1) TGF-β1和10.0μmol·L^(-1)的K115)。采用Transwell实验检测K115对人Tenon囊成纤维细胞迁移的影响;免疫荧光法测定人Tenon囊成纤维细胞中α-SMA蛋白的表达;流式细胞仪检测细胞凋亡情况。对实验所得各指标进行统计学分析。结果本研究细胞培养状态良好,6~8周可见人Tenon囊成纤维细胞铺满培养瓶瓶底。用CCK-8试剂盒检测各组细胞增殖情况结果显示,对照组、TGF-β1组、TGF-β1+5.0μmol·L^(-1) K115组、TGF-β1+10.0μmol·L^(-1) K115组光密度值分别为0.977±0.042、1.306±0.059、0.862±0.035、0.558±0.042,TGF-β1+5.0μmol·L^(-1) K115组、TGF-β1+10.0μmol·L^(-1) K115组光密度值均小于TGF-β1组(均为P<0.05),并且呈现浓度依赖性减小,K115浓度越大细胞增殖减少幅度越大。Transwell实验结果显示,对照组、TGF-β1组、TGF-β1+5.0μmol·L^(-1) K115组、TGF-β1+10.0μmol·L^(-1) K115组迁移细胞数分别为(38.67±3.06)个、(81.00±4.00)个、(44.33±3.21)个、(23.67±2.52)个;TGF-β1+5.0μmol·L^(-1) K115组与TGF-β1组比较,迁移细胞数降低,差异有统计学意义(P<0.05);TGF-β1+10.0μmol·L^(-1) K115组与对照组及TGF-β1组比较,迁移细胞数均明显降低,差异均有统计学意义(均为P<0.05)。各组细胞内α-SMA蛋白免疫荧光染色结果显示,对照组人Tenon囊成纤维细胞胞浆内可见散在分布的绿色荧光物质,TGF-β1处理后24 h(TGF-β1组),胞浆内绿色丝状荧光物质明显增加,荧光强度差异有统计学意义(P<0.05);与TGF-β1组比较,TGF-β1+5.0μmol·L^(-1) K115组和TGF-β1+10.0μmol·L^(-1) K115组细胞胞浆内的荧光强度呈浓度依赖性减弱,K115浓度越高荧光强度减弱越明显(均为P<0.05)。流式细胞仪检测结果显示,对照组细胞凋亡率为(2.400±0.346)%,TGF-β1组为(0.900±0.173)%,TGF-β1+5.0μmol·L^(-1) K115组为(1.333±0.252)%,TGF-β1+10.0μmol·L^(-1) K115组为(1.067±0.058)%;TGF-β1组的细胞凋亡率较对照组降低(P<0.05);TGF-β1+5.0μmol·L^(-1) K115组和TGF-β1+10.0μmol·L^(-1) K115组的细胞凋亡率均较对照组降低(均为P<0.05),而与TGF-β1组比较,差异均无统计学意义(均为P>0.05)。结论K115对TGF-β1诱导的人Tenon囊成纤维细胞增殖和迁移有明确的抑制作用,其作用机制可能与K115抑制了TGF-β1诱导的细胞内α-SMA的表达进而调控了细胞活化有关。