脊髓损伤模型大鼠神经修复与法舒地尔和RhoA基因沉默的干预

背景：研究认为Rho激酶可致使神经生长锥塌陷,对神经修复具有抑制作用。 目的：观察Rho激酶抑制剂法舒地尔及RNA干预介导的RhoA基因沉默对脊髓损伤大鼠在体神经损伤修复的作用。 方法：雄性SD大鼠60只半切法制成脊髓半横断模型,随机等分成对照组、法舒地尔组和RhoA siRNA组。法舒地尔组于腹腔注射10 mg/kg法舒地尔,2次/d,连续用药1周;RhoA siRNA干扰组将RhoA siRNA表达质粒注射于大鼠脊髓损伤区。 结果与结论：伤后4周,法舒地尔和RhoA siRNA组大鼠后肢运动功能均有明显恢复,可见少量神经轴索样结构,辣根过氧化物酶阳性神经纤维数增多(P < 0.05),体感诱发电位的潜伏期明显缩短、波幅显著增强(P < 0.05)。提示大鼠脊髓损伤后给予Rho激酶抑制剂法舒地尔及RNA介导的RhoA基因沉默能够促进受损伤的脊髓神经功能恢复。     

法舒地尔通过抑制兔尿道成纤维细胞Rho/ROCK通路激活减少尿道损伤后狭窄的发生

目的:研究法舒地尔对创伤后兔尿道狭窄发生的影响及机制,观察兔尿道成纤维细胞活力、迁移以及细胞外基质合成情况。方法:利用显微外科技术建立兔尿道创伤动物模型,分为5组:假手术组,手术组,不同剂量(3 mg/kg、10 mg/kg、30 mg/kg)法舒地尔组,术后3个月逆行尿道造影测量狭窄直径。从兔尿道瘢痕组织提取成纤维细胞进行传代培养,培养液中分别加入TGF-β1(10μg/L)和/或法舒地尔(12.5μmol/L,25μmol/L,50μmol/L)。MTT比色法检测细胞活力;用Transwell小室实验检测细胞迁移能力;Western blot法检测各组Rho相关激酶(ROCK)、α-平滑肌肌动蛋白(α-SMA)以及胶原蛋白Ⅰ和Ⅲ的表达情况。结果:法舒地尔显著减少尿道损伤后狭窄发生(P0.05)。随着法舒地尔浓度的增加,成纤维细胞的活力受到抑制,细胞迁移能力逐渐减弱,ROCK、α-SMA以及胶原蛋白Ⅰ和Ⅲ的表达受到抑制;法舒地尔对兔尿道成纤维细胞外基质及ROCK表达起抑制作用,并呈剂量依赖性(P0.05)。结论:法舒地尔可以通过下调TGF-β1诱导的兔尿道成纤维细胞Rho/ROCK通路,抑制细胞外基质形成,减少尿道损伤后狭窄的发生。     

Effects of Nogo-A and its receptor on the repair of sciatic nerve injury in rats

Regeneration of injured peripheral nerves is an extremely complex process. Nogo-A (neurite outgrowth inhibitor-A) inhibits axonal regeneration by interacting with Nogo receptor in the myelin sheath of the central nervous system (CNS). The aim of this study was to investigate the effects of Nogo-A and its receptor on the repair of sciatic nerve injury in rats. Sprague-Dawley rats (n=96) were randomly divided into 4 groups: control group (control), sciatic nerve transection group (model), immediate repair group (immediate repair), and delayed repair group (delayed repair). The rats were euthanized 1 week and 6 weeks after operation. The injured end tissues of the spinal cord and sciatic nerve were obtained. The protein expressions of Nogo-A and Nogo-66 receptor (NgR) were detected by immunohistochemistry. The protein expressions of Nogo-A, NgR, and Ras homolog family member A (RhoA) were detected by western blot. At 1 week after operation, the pathological changes in the immediate repaired group were less, and the protein expressions of Nogo-A, NgR, and RhoA in the spinal cord and sciatic nerve tissues were decreased (P<0.05) compared with the model group. After 6 weeks, the pathological changes in the immediate repair group and the delayed repair group were alleviated and the protein expressions decreased (P<0.05). The situation of the immediate repair group was better than that of the delayed repair group. Our data suggest that the expression of Nogo-A and its receptor increased after sciatic nerve injury, indicating that Nogo-A and its receptor play an inhibitory role in the repair process of sciatic nerve injury in rats.     

法舒地尔和RhoA沉默对许旺细胞增殖的影响

背景：许旺细胞在周围神经损伤和修复再生过程中发挥重要作用。 目的：观察Rho激酶抑制剂法舒地尔和RNAi介导的RhoA基因沉默对大鼠许旺细胞增殖的影响。 方法：体外培养Wistar大鼠许旺细胞,分6组干预：对照组,5,10,15,20 μmol/L 法苏地尔组,siRNA沉默RhoA基因组。处理后第3天,RT-PCR、Western blot检测各组许旺细胞RhoA基因和蛋白的表达。连续5 d用细胞计数法测定生长曲线。应用MTT比色法观察许旺细胞增殖情况;采用流式细胞术测定许旺细胞周期分布的变化。 结果与结论：法苏地尔浓度增加到20 μmol/L时对细胞的作用并非随浓度的增加而增强,与15 μmol/L组的差异无显著性意义(P > 0.05)。Rho激酶抑制剂法舒地尔和RNAi介导的RhoA基因沉默在体外实验均能促进许旺细胞,法舒地尔最佳作用浓度为15 μmol/L,沉默RhoA基因效果较好。     

大鼠视神经损伤后大胶质细胞去分化及预变性腓总神经的诱导

目的研究视神经损伤后神经胶质细胞的去分化及其诱导。方法成年雄性SD大鼠,分为正常对照组、损伤组、移植组和压榨移植组,在视神经伤后3d、7d、14d和28d 4个不同时相点取视神经,用HE方法计数细胞数量,用免疫组织化学、免疫印迹、原位杂交组织化学结合计算机图像分析检测巢蛋白(Nestin)、胶质纤维酸性蛋白(GFAP)、髓鞘碱性蛋白(MBP)、神经丝(NF)、脑源性神经营养因子(BDNF)、Nogo-A及Nogo-A mRNA的表达,用免疫荧光双标组织化学法检测Nestin-GFAP和Nestin-MBP的共表达。结果损伤组细胞数量仅在伤后7d明显增多,Nestin、MBP、Nogo-A及其mRNA表达上调,GFAP、NF、BDNF下调,出现一些Nestin-GFAP双标细胞和少量Nestin-MBP双标细胞;与损伤组相比,移植组和压榨移植组一些时相点的细胞数量不同程度地增多,Nestin、GFAP、BDNF和NF表达上调,MBP、Nogo-A及其mRNA表达下调,Nestin-GFAP双标细胞有所增加,且28d组高于14d组。结论视神经损伤后,主要是星形胶质细胞发生去分化,大胶质细胞呈现一些不利于神经再生的基因表达变化;移植预变性周围神经能进一步诱导星形胶质细胞去分化,大胶质细胞的一些基因表达变化有利于神经再生。     

鹿茸多肽对APP/PS1双转基因小鼠Rho/ROCK通路的影响

目的 探讨鹿茸多肽(VAP)对APP/PS1双转基因小鼠Rho/ROCK通路的影响.方法 APP/PS1双转基因小鼠随机分为模型组和鹿茸多肽组,每组20只,另以同窝同性别阴性小鼠20只设立为对照组.鹿茸多肽组小鼠鹿茸多肽100 mg/kg灌胃给药,每天1次,连续28 d.治疗后水迷宫实验检测并记录小鼠逃避潜伏期和穿越平...     

运动预适应与力竭运动大鼠心肌损伤：Rho/ROCK信号通路的作用

背景:目前,关于运动预适应的心肌保护机制尚未完全阐明,据报道Rho/ROCK信号通路在心血管疾病中起到关键作用,运动预适应是否通过Rho/ROCK信号通路对心肌起到保护作用有待研究。目的:基于Rho/ROCK信号通路探讨运动预适应在力竭运动大鼠心肌损伤中的作用。方法:将60只5周龄的SPF级SD雄性大鼠随机分为3组:安静对照组、单纯力竭运动组、运动预适应+力竭运动组,各组建模结束后1 h,取血清进行全生化分析检测心肌酶谷草转氨酶、磷酸肌酸激酶、乳酸脱氢酶水平,取心肌组织标本进行苏木精-碱性复红-苦味酸染色观察心肌组织病理变化,分析缺血缺氧程度,TUNEL法观察心肌细胞凋亡情况,ELISA法检测心肌组织肿瘤坏死因子α和白细胞介素10水平,Western blot检测心肌组织RhoA、ROCK1、ROCK2、Bax和Bcl-2蛋白的表达。结果与结论:①单纯力竭运动组谷草转氨酶、磷酸肌酸激酶、乳酸脱氢酶水平显著高于安静对照组(P<0.05);而运动预适应+力竭运动组谷草转氨酶、磷酸肌酸激酶、乳酸脱氢酶水平显著低于单纯力竭运动组(P<0.05);②单纯力竭运动组心肌细胞界限不清楚,呈现出较多斑块状或片状艳红色样区域,与安静对照组相比,有明显的缺血缺氧改变;运动预适应+力竭运动组部分心肌细胞界限不清楚,出现部分斑块状艳红色染色,较单纯力竭运动组缺血缺氧程度明显减轻;③单纯力竭运动组较安静对照组凋亡指数值明显升高,运动预适应+力竭运动组与单纯力竭运动组相比凋亡指数值明显下降(P<0.05);④单纯力竭运动组的肿瘤坏死因子α和白细胞介素10水平显著高于安静对照组(P<0.05),运动预适应+力竭运动组肿瘤坏死因子α和白细胞介素10水平显著低于单纯力竭运动组(P<0.05);⑤单纯力竭运动组的Bcl-2/Bax显著低于安静对照组(P<0.05),运动预适应+力竭运动组Bcl-2/Bax显著高于单纯力竭运动组(P<0.05);⑥与安静对照组相比,单纯力竭运动组RhoA、ROCK1、ROCK2蛋白水平明显升高,而运动预适应+力竭运动组RhoA、ROCK1、ROCK2蛋白水平显著低于单纯力竭运动组(P<0.05);⑦结果表明,运动预适应对心肌损伤具有保护作用,可改善大鼠的心脏功能,其作用机制可能与Rho/ROCK通路有关。     

Expression and modulation of Rho kinase in human pregnant myometrium

There is little information outlining the role of Rho kinase, RhoA, and calcium sensitization in regulation of human uterine contractility during pregnancy. The aims of this study were to investigate the expression of RhoA, and the Rho kinases ROCK I and ROCK II in human pregnant myometrium, to evaluate the effects of Rho kinase inhibition on pregnant human myometrial contractility in vitro, and to compare these effects with those of the calcium channel blocker nifedipine. RT-PCR using primers for RhoA, ROCK I and ROCK II was performed on mRNA isolated from human pregnant myometrium. Isometric recording was performed in isolated myometrial strips obtained at Caesarean section. The effects of the Rho kinase inhibitor Y-27632 (1 nmol/l to 10 mmol/l), and nifedipine (1 nmol/l to 10 mmol/l), on oxytocin (0.5 nmol/l) induced contractions were measured and compared. Expression of RhoA, ROCK I and ROCK II mRNA was identified in human pregnant myometrium (n = 3). Y-27632 exerted a potent relaxant effect on myometrial contractility with a pD(2) value (+/- SEM) of 7.63 +/- 0.38 (n = 6). The maximum net relaxant effect (+/- SEM) was 72.3 +/- 6.1% (n = 6). Corresponding values for nifedipine were 7.24 +/- 0.48 (n = 6; P = 0.469) and 93.40 +/- 3.1% (n = 6; P = 0.028). Rho A/Rho kinase-mediated calcium sensitization may play role in the physiology of human parturition, and pharmacological inhibition of this pathway may therefore provide a novel approach to tocolysis for pre-term labour.     

前列腺素E1对肾缺血再灌注损伤大鼠内皮的Rho/Rho激酶信号通路的影响

探讨前列腺素E1对肾缺血再灌注损伤大鼠内皮细胞Rho/Rho激酶信号通路的影响.建立大鼠IRI模型,将健康Wistar大鼠75只随机平均分为假手术组、模型组、治疗组,每组各25只;并按术后观察时间分为6、12、24、48、72 h5个不同时段亚组,每组各5只.检测各组血清肌酐(Scr)、血管内皮生长因子(Vascula...     

Fasudil,an inhibitor of Rho-associated coiled-coil kinase,attenuates hyperoxia-induced pulmonary fibrosis in neonatal rats

Background: Oxygen therapy is important during the management of high-risk neonatal infants, such as those with preterm birth, low birth weight, and asphyxia. However, prolonged exposure to high oxygen concentrations can readily lead to diffuse nonspecific inflammation, which promotes airway remodeling and pulmonary fibrosis. The Rho/Rho-associated coiled-coil kinase (Rho/ROCK) signaling pathway plays an important role in numerous developmental and proliferative diseases. This study was performed to determine the efficacy of ROCK inhibitor fasudil in blocking the development of hyperoxia-induced lung injury and fibrosis in neonatal rats. Methods: Neonatal rats were randomly divided into four groups: air + saline group, air + fasudil group, hyperoxia + saline group, and hyperoxia + fasudil group. The hyperoxia + saline and Hyp + fasudil groups were exposed to 95% oxygen for 21 days and administered intraperitoneal saline or fasudil once daily. The air + saline and air + fasudil group were exposed to 21% oxygen (room air) and administered the same volume of intraperitoneal saline or fasudil. Results: Fasudil-treated rats exhibited improved histopathological changes and decreased lung hydroxyproline content. Fasudil attenuated the protein level of alpha-smooth muscle actin, transforming growth factor-β1, and connective tissue growth factor. Additionally, fasudil reduced the activation of ROCK1 and myosin phosphatase targeting subunit 1 protein in the Rho/ROCK signaling pathway. Conclusions: Fasudil may be a potentially effective therapeutic drug for hyperoxia-induced pulmonary fibrosis.     

法舒地尔和RhoA沉默对神经干细胞增殖的影响

背景：Rho及其相关分子在神经轴突生长、分化、延伸及突触形成中起重要作用,阻断和抑制RhoA/ROCK通路可促进神经干细胞的增殖与生长。 目的：观察Rho激酶抑制剂法舒地尔和RNAi介导的RhoA基因沉默对大鼠神经干细胞增殖的影响。 方法：体外培养Wistar胎鼠神经干细胞,分6组干预：空白对照组,5,10,15,20 μmol/L 法舒地尔组,siRNA 沉默RhoA基因组。干预后第3天,采用RT-PCR,Western blot检测各组神经干细胞RhoA基因及蛋白的表达。应用MTT比色法观察神经干细胞增殖情况;采用流式细胞术测定神经干细胞周期分布的变化。 结果与结论：15,20 μmol/L 法舒地尔组、siRNA 沉默RhoA基因组神经干细胞RhoA基因及蛋白表达量较5,10 μmol/L 法舒地尔组、空白对照组明显降低(P< 0.05),细胞的生长速度较5,10 μmol/L 法舒地尔组、空白对照组明显增快(P < 0.05),细胞周期G0/G1期减少(P< 0.05),S期细胞数增多(P< 0.05)。当法舒地尔浓度增加到20 μmol/L时对细胞的作用并非随浓度的增加而增强,与15 μmol/L组的差异无显著性意义(P > 0.05)。15,20 μmol/L 法舒地尔组与siRNA 沉默RhoA基因组相比差异无显著性意义(P> 0.05)。说明Rho激酶抑制剂法舒地尔和RNAi介导的RhoA基因沉默在体外均能促进神经干细胞增殖,法舒地尔最佳作用浓度为15 μmol/L。     

视神经横断后生长抑制因子Nogo及其受体NgR mRNA表达的变化及意义

观察大鼠视神经横断后Nogo-A及其受体NgR mRNA表达的变化.将36只正常成年SD大鼠随机分为三组,视神经横断7d组、14d组和正常对照组,每组12只.分别提取视神经组织,使用实时荧光定量聚合酶链式反应法定量分析Nogo-A及NgR mRNA表达量的变化.实验结果显示,在大鼠的视神经组织中存在Nogo-A及其受体...     

RhoA经基质金属蛋白酶-3、-9通路介导心力衰竭大鼠心肌重塑及心功能恶化

目的:探讨RhoA、Rho激酶、基质金属蛋白酶家族(MMPs)MMP-3、MMP-9表达与心肌重塑及心功能损害的关系。方法:建立假手术组及心力衰竭大鼠(造模12周及20周)模型。应用Nikon 4多导生理记录仪检测血液动力学指标以评价心功能情况,心肌肥厚指数及H-E染色评价心肌重塑情况,并采用RT-PCR方法检测各组大鼠心肌组织RhoA、Rho激酶及MMP-3、MMP-9基因表达。结果:造模20周、造模12周心力衰竭组大鼠与假手术组大鼠对比,随心肌重塑加重、心功能恶化,RhoA、Rho激酶及MMP-3、MMP-9基因表达显著增加,且直线相关分析结果显示RhoA基因表达与Rho激酶、MMP-3、MMP-9基因表达呈正相关趋势。结论:RhoA可能通过刺激MMP-3、MMP-9的表达引起细胞外基质结构发生改变,引起心肌重塑和心功能恶化。     

Effect of combined therapy with ephedrine and hyperbaric oxygen on neonatal hypoxic–ischemic brain injury

Perinatal hypoxic–ischemic (HI) is a major cause of brain injury in the newborn, and there is a lack of effective therapies to reduce injury-related disorders. The aim of the present study was to evaluate the effect of a combination of ephedrine and hyperbaric oxygen (HBO) on neonatal hypoxic–ischemic brain injury. 7-day-old Sprague–Dawley rat pups were randomly divided into sham operation, HI, ephedrine, HBO, and combined group. The ephedrine group was intraperitoneally injected with ephedrine, HBO group was treated for 2 h at 2.5 absolute atmosphere (ATA) per day, the combined group received both ephedrine and HBO treatments, the sham operation and HI groups were intraperitoneally injected with normal saline. Rat brains at 7 days after HI, were collected to determine histopathological damage and the expression levels of Caspase-3 and Nogo-A. Four weeks after insult, animals were challenged with Morris water maze test. The expressions of Caspase-3 and Nogo-A were reduced in treating groups compared to those in HI group (P < 0.01). Compared with the single treatment groups, the expression levels of Caspase-3 and Nogo-A were significantly reduced in the combined group (P < 0.01). Compared with the single treatment groups, the average time of escape latency was significantly shorter (P < 0.01) and the number of platform location crossing was more (P < 0.05) in combined group. These findings indicate that the combination of ephedrine and HBO can enhance the neuroprotective effect in the neonatal rat HI model partially mediated by inhibiting Caspase-3 and Nogo-A pathways.     

Increased activity of Rho kinase contributes to hemoglobin-induced early disruption of the blood-brain barrier in vivo after the occurrence of intracerebral hemorrhage

This study is to examine whether the activation of Rho kinase (ROCK) accounts for hemoglobin (Hb)-induced disruption of blood-brain barrier (BBB) after the occurrence of intracerebral hemorrhage. A model of intracerebral injection of Hb was established in rats. Changes in the levels of mRNA of RhoA, ROCK2 and matrix metalloproteinase-9 (MMP-9) were measured using quantitative real-time polymerase chain reaction. Protein expression of RhoA, ROCK2, claudin-5 and MMP-9, as well as ROCK activity, were determined using Western blotting. Immunohistochemical assay was performed to visualize the expression of RhoA, ROCK2, claudin-5 and MMP-9 in endothelial cells. Hb injection produced a significant increase in BBB permeability and water content in the brain. Significant reduction of claudin-5 expression was detected by Western blotting and immunofluorescence in Hb group. The levels of RhoA and ROCK2 were significantly up-regulated from 6 h to 12 h after Hb injection and were concomitant with the increase in ROCK activity. Immunofluorescence double staining showed enhanced p-myosin light chain immunoreactivity but diminished claudin-5 staining in endothelial cells. Significant up-regulation of MMP-9 expression was detected after Hb injection, and statistical analyses further confirmed a positive correlation of MMP-9 expression with ROCK activity. The results showed that ROCK was activated in endothelial cells by Hb. This may account for the early disruption of the BBB via up-regulation of p-myosin light chain expression and aggravation of injuries to TJ proteins. The activation of ROCK may also increase MMP-9 expression, thereby leading to further BBB disruption.     

RhoA和ROCK2在SOD1-G93A转基因小鼠脊髓中的表达

目的:通过研究RhoA和ROCK2在SOD1-G93A转基因小鼠脊髓内的表达变化以阐明Rho/ROCK信号通路在肌萎缩侧索硬化症(ALS)病程中的作用。方法:饲养SOD1-G93A转基因小鼠和同窝野生型小鼠至发病早期、中期和晚期,部分小鼠冰上剥离新鲜脊髓组织,利用RT-PCR方法检测RhoA和ROCK2 mRNA的表达,利用Western Blot方法检测RhoA和ROCK2蛋白的表达;部分小鼠行心脏灌注并剥离其脊髓组织制成冰冻切片,利用免疫组织化学染色方法检测RhoA和ROCK2蛋白的表达。结果:在SOD1-G93A鼠发病的早期、中期和晚期,转基因小鼠脊髓中RhoA和ROCK2的mRNA及蛋白表达均上调。免疫组织化学染色实验结果显示,野生型小鼠脊髓中RhoA和ROCK2弥散分布于胞质和突起中,阳性染色浅,SOD1-G93A转基因小鼠脊髓中RhoA和ROCK2阳性染色深,大量聚集在细胞膜及细胞质。结论:RhoA和ROCK2在SOD1-G93A转基因小鼠脊髓中异常高水平表达与ALS脊髓区病变密切相关,可能参与ALS疾病进程。     

小鼠脊髓损伤后Nogo-A的免疫组织化学研究

目的研究小鼠脊髓损伤后Nogo-A的表达情况。方法 C57小鼠分为脊髓损伤组、假手术组和正常对照组,每组均在损伤后不同时间点（损伤后1 h,12 h,24 h）取材,然后行Nogo-A免疫组织化学染色。结果 Nogo-A明显表达于神经元胞体及其突起形成的神经纤维。随着损伤后存活时间的延长,Nogo-A阳性细胞数量和免疫反应强度均逐渐升高。结论脊髓损伤后24 h内Nogo-A在神经元的表达逐渐升高,导致神经再生困难。     

Intranasal delivery of FSD‐C10, a novel Rho kinase inhibitor,exhibits therapeutic potential in experimental autoimmune encephalomyelitis

Viewing multiple sclerosis (MS) as both neuroinflammation and neurodegeneration has major implications for therapy, with neuroprotection and neurorepair needed in addition to controlling neuroinflammation in the central nervous system (CNS). While Fasudil, an inhibitor of Rho kinase (ROCK), is known to suppress experimental autoimmune encephalomyelitis (EAE), an animal model of MS, it relies on multiple, short‐term injections, with a narrow safety window. In this study, we explored the therapeutic effect of a novel ROCK inhibitor FSD‐C10, a Fasudil derivative, on EAE. An important advantage of this derivative is that it can be used via non‐injection routes; intranasal delivery is the preferred route because of its efficient CNS delivery and the much lower dose compared with oral delivery. Our results showed that intranasal delivery of FSD‐C10 effectively ameliorated the clinical severity of EAE and CNS inflammatory infiltration and promoted neuroprotection. FSD‐C10 effectively induced CNS production of the immunoregulatory cytokine interleukin‐10 and boosted expression of nerve growth factor and brain‐derived neurotrophic factor proteins, while inhibiting activation of p‐nuclear factor‐κB/p65 on astrocytes and production of multiple pro‐inflammatory cytokines. In addition, FSD‐C10 treatment effectively induced CD4⁺ CD25⁺, CD4⁺ FOXP3⁺ regulatory T cells. Together, our results demonstrate that intranasal delivery of the novel ROCK inhibitor FSD‐C10 has therapeutic potential in EAE, through mechanisms that possibly involve both inhibiting CNS inflammation and promoting neuroprotection.     

The role of Rho/Rho-kinase pathway in the expression of ICAM-1 by linoleic acid in human aortic endothelial cells

Linoleic acid (LA), a dietary unsaturated fatty acid, has been known to increase the expression of adhesion molecules such as intercellular adhesion molecule-1 (ICAM-1) through the activation of nuclear factor-kappa B. Rho/Rho-kinase (ROCK) pathway mediates various cellular functions related to cardiovascular disease and affects the expression of ICAM-1. However, the exact mechanism underlying this action has not been fully elucidated. In this study, we aimed to find out the role of Rho/ROCK pathway in LA-induced ICAM-1 expression in human aortic endothelial cells (HAECs). We found that LA increased ICAM-1 expression and phosphorylation of ROCK and MYPT-1, a distal signal of ROCK. Y-27632, a ROCK inhibitor, suppressed ICAM-1 expression and phosphorylation of MYPT-1 induced by LA. The effect of LA on the increased phosphorylation of MYPT1 and expression of ICAM-1 was abolished by knocking down RhoA and ROCK2 protein level expression using small interfering RNA. LA increased NF-κB DNA-binding activity, which was inhibited with pretreatment with Y-27632. This study suggests that Rho/ROCK pathway plays a role in LA-induced ICAM-1 expression, which is possibly mediated by NF-κB in HAECs.     

RhoA/ROCK信号通路在异常应力下关节软骨中的表达

背景：RhoA/ROCK信号通路在活体内关节软骨退变或者骨性关节炎的病理过程中是否发挥着作用,为此设计了该实验。 目的：探索RhoA/ROCK信号通路在软骨退变过程中的作用。 方法：采用家兔右膝关节伸直位制动模型,对制动2,4,6 周及对照组家兔的右膝关节胫骨平台负重面全层软骨进行苏木精-伊红染色、番红O染色及RhoA、ROCK免疫组织化学染色,比较制动前后软骨组织学、病理积分及RhoA、ROCK表达变化情况。 结果与结论：随着制动时间的延长,关节软骨退变程度逐渐加重,Mankin评分逐渐增加,且各组评分之间差异有显著性意义(P < 0.05)。免疫组织化学提示RhoA、ROCK表达变化主要集中在切线层及中间层软骨,且二者在关节软骨退变过程中表达变化趋势一致,均为先增多后减少。结果表明,在关节软骨退变过程中,RhoA/ROCK信号通路表达先递增后逐渐降低,RhoA/ROCK信号通路在异常应力所致的关节软骨退变过程中发挥了效应。