热休克蛋白47重组质粒对病理性瘢痕的体内干预研究

Objective To study the significance of HSP47 gene in the development of pathological scar. Methods The nude mice were used to reconstruct animal model of pathological scar. 16 days later, the mixture of recombinant HSP47siRNA and liposome was injected into the pathological scar in experimental group. In the control group, 0.25ml PBS was injected intraperitoneally. 7 days after Injection, the specimens were collected for detection of mRNA of HSP47, the collagen and for immunohistochemical study. Results In the control and experimental greup, the collagen content was (91.71±1.24)% and (82.12±4.79)%, respectively; the expression of HSP47mRNA was 1 042 862.01±604 194.36 and 306 123.68±105 857.08, respectively;the expression of collagen Ⅰ mRNA was 10 228 614.70±2 532 879.04 and 6 011 841.97±2 886 897.17, respectively;the scar volume was (255.60±21.34) mm3 and (132.99±24.06) mm3 ,respectively. All the above results showed significant difference between the two groups (P < 0.05). Conclusions The collagen production can be reduced through suppression of the expression of HSP47 gene. It indicates that HSP47 geue enhance the development of keloid and could be used as the taget of treatment.     

RNA干扰技术阻抑热休克蛋白对瘢痕疙瘩生成的影响

目的利用RNA干扰（RNAi）技术,通过热休克蛋白47重组质粒（HSP47siRNA）和脂质体的混合液,对瘢痕疙瘩裸鼠动物模型的体内干预后,分析HSP47基因在瘢痕疙瘩生成中的作用。方法构建裸鼠瘢痕疙瘩动物模型,于第16天腹腔麻醉后在实验组瘢痕疙瘩内注射质粒、脂质体混合液0．25ml,对照组裸鼠腹腔注射磷酸缓冲液（PBS）0．25ml,原笼饲养,7d回收标本,分别做mRNA水平检测、胶原蛋白水平检测以及免疫组织化学检测。结果实验组HSP47mRNA表达明显降低,且实验组总胶原含量,I型胶原蛋白mRNA表达与对照组比较也明显降低,差异均有统计学意义（P〈0．05）。结论利用RNAi技术,通过过HSP47siRNA表达载体特异性沉默瘢痕疙瘩中HSP47基因表达后,瘢痕疙瘩中胶原蛋白的合成和分泌均能得到明显抑制,表明HSP47基因具有促进瘢痕疙瘩生成作用,为抑制瘢痕疙瘩提供新的靶点。     

RNA干扰技术阻抑热休克蛋白对瘢痕疙瘩生成的影响

目的 利用RNA干扰(RNAi)技术,通过热休克蛋白47重组质粒(HSP47 siRNA)和脂质体的混合液,对瘢痕疙瘩裸鼠动物模型的体内干预后,分析HSP47基因在瘢痕疙瘩生成中的作用.方法 构建裸鼠瘢痕疙瘩动物模型,于第16天腹腔麻醉后在实验组瘢痕疙瘩内注射质粒、脂质体混合液0.25 ml,对照组裸鼠腹腔注射磷酸缓冲液(PBS)0.25 ml,原笼饲养,7 d回收标本,分别做mRNA水平检测,胶原蛋白水平检测以及免疫组织化学检测.结果 实验组 HSP47 mRNA表达明显降低,且实验组总胶原含量,Ⅰ型胶原蛋白 mRNA表达与对照组比较也明显降低,差异均有统计学意义(P＜0.05).结论 利用RNAi技术,通过过HSP47 siRNA表达载体特异性沉默瘢痕疙瘩中HSP47基因表达后,瘢痕疙瘩中胶原蛋白的合成和分泌均能得到明显抑制,表明HSP47基因具有促进瘢痕疙瘩生成作用,为抑制瘢痕疙瘩提供新的靶点.     

病理性瘢痕中热休克蛋白47的表达与胶原沉积相关性研究

目的　探讨热休克蛋白 4 7(heatshock protein 4 7,HSP4 7)在病理性瘢痕中的表达与胶原沉积的相关性。　方法　取经病理科确诊的正常皮肤 (10名 )、增生性瘢痕 (19例 )和瘢痕疙瘩 (16例 )组织标本 ,应用免疫组织化学方法、苦味酸 -天狼星红偏振光分析法检测组织中 HSP4 7的表达及胶原纤维含量。　结果　增生性瘢痕平均 IOD值5 2 115 9.5 0± 2 72 994 .13,瘢痕疙瘩组织平均 IOD值 4 0 74 4 0 .30± 2 95 780 .6 3中 HSP4 7表达量显著高于正常皮肤组织平均 IOD值 130 5 0 .17± 4 789.4 1,差异有统计学意义 (P<0 .0 1) ;HSP4 7的表达量与病理性瘢痕总胶原纤维含量呈正相关关系 (r=0 .386 ,P<0 .0 5 )。　结论　 HSP4 7在病理性瘢痕中异常高表达 ,并可能在病理性瘢痕胶原沉积的过程中发挥重要作用。     

热休克因子1及其与热休克蛋白表达的关系研究进展

This article reviews the advances in the research of the structural characteristics and the activating process of heat shock factor 1(HSF-1),the factors that influence the expression of HSF-1,and the r...     

shRNA介导的热休克蛋白70敲低对人结肠癌细胞在裸鼠体内生长的影响

目的:探讨热休克蛋白70(HSP70)敲低对结肠癌细胞在裸鼠体内生长的影响。方法:构建两种干扰HSP70的shRNA(HSP70 shRNA-1和HSP70 shRNA-2)质粒表达载体,分别转染到结肠癌HT29细胞,并以空质粒转染(阴性对照)和未转染的HT29细胞(空白对照)为对照,用RT-PCR和Western blot方法检测各组HT29细胞HSP70基因和蛋白的表达;将HSP70shRNA-2转染、空质粒转染及未转染的HT29细胞分别接种至裸鼠皮下建立移3组植瘤模型,观察肿瘤生长情况,3周后剥离瘤块,用HE染色、免疫组化和TUNEL法分别检测移植瘤组织形态学、增殖细胞核抗原(PCNA)的表达及细胞凋亡情况。结果:RT-PCR和Western blot结果显示HSP70 shRNA-1和HSP70 shRNA-2均能明显抑制HT29细胞HSP70基因和蛋白的表达,且HSP70 shRNA-2的抑制作用更为明显,空质粒转染对HSP70的表达无明显影响;与空白对照组比较,HSP70 shRNA-2转染组裸鼠移植瘤生长明显较明显减慢(P<0.01),瘤组织中心出现明显坏死,PCNA表达明显降低,细胞凋亡率明显增加(P<0.01),而空质粒转染组无明显上述改变(P>0.05)。结论:HSP70沉默能抑制结肠癌HT29细胞裸鼠移植瘤的生长,促进细胞凋亡,HSP70可能是治疗结肠癌有效靶点。     

苦参素对大鼠急性脊髓损伤后热休克蛋白47表达的影响

目的探讨苦参素治疗大鼠急性脊髓损伤(SCI)的机制。方法用30只Wistar大鼠制作钳夹型SCI模型,随机分成正常组、假手术组、SCI组、对照组和治疗组,在SCI后3d及每周评价BBB评分,并在第8周用免疫组化方法分析脊髓中热休克蛋白47(HSP47)的表达情况。结果正常组和假手术组Wistar大鼠脊髓组织低表达胶质细胞酸性蛋白(GFAP)和HSP47,高表达神经丝蛋白(NF),在SCI后GFAP和HSP47表达明显提高(P<0.05),NF表达明显降低(P<0.05)。苦参素治疗后,GFAP和HSP47表达降低(P<0.05),NF表达升高(P<0.05)。结论苦参素对Wistar大鼠SCI具有治疗作用,很可能通过抑制HSP47的表达发挥治疗作用。     

热休克蛋白27、70与恶性肿瘤

热休克蛋白(heat shock protein,HSP)广泛存在于生物体内,是一类在进化上高度保守的细胞应激蛋白.其中HSP27和HSP70在抗凋亡过程中发挥重要的作用,在多种肿瘤细胞中异常高表达,尤其是腺癌起源的肿瘤.HSP27和HSP70在恶性肿瘤的发生、发展中的作用及其机制是近年来研究的热点,有望对肿瘤的治疗提供新的平台.     

热休克蛋白47与肾脏纤维化

热休克蛋白47(HSP47)是胶原特异性“分子伴侣”，可能在不同器官的纤维化进程中起重要作用。本文综述了HSP47的基因结构、分子特点、功能及在肾脏纤维化中的作用。     

Effect of heat shock protein 47 on epithelial-mesenchymal transdifferentiation induced by transforming growth factor β1 in the renal tubular epithelial cells

Objective To detect the expression of heat shock protein 47(HSP47) in renal proximal epithelial cell lines (HK-2) and to investigate the role of HSP47 in the progress of transforming growth factor β1 (TGF-β1) induced epithelial-mesenchymal transdifferentiation (EMT) in HK-2 cells. Methods HK-2 cells were exposed to TGF-β1 (0, 2.5, 5, 10 μg/L) for different time (0, 12, 24, 48 h). The expression of HSP47 was examined by Western blotting. Then HK-2 cells were exposed to 10 μg/L TGF-β1, the expressions of vimentin, zona occludens-1 (ZO-1) were examined by Western blotting and real-time PCR. Furthermore, the expressions of p-Smad3 and Smad3 were examined by Western blotting. HK-2 cells were transfected with HSP47 siRNA and siRNA negative control before exposing to TGF-β1. Then the expressions of vimentin, ZO-1 were detected by Western blotting and real-time PCR, meanwhile Western blotting for HSP47, p-Smad3 and Smad3. Results Stimulating HK-2 with TGF-β1resulted in a significant increased expression of HSP47 in time-and concentration-dependent manner (P＜0.05). Meanwhile, TGF-β1up-regulated the protein and mRNA expression of vimentin (P＜0.05), and down-regulated the protein and mRNA expression of ZO-1 (P＜0.05), all in time-dependent manner. Stimulating HK-2 with TGF-β1 resulted in phosphorylation of Smad3, which was peaked at 30 min, slightly decreased at 1 h, and then increased again between 24 and 48 h (P＜0.05). Compared to the TGF-β1group, inhibition of HSP47 expression in HK-2 up-regulated the protein and mRNA expression of ZO-1, down-regulated the protein and mRNA expression ofvimentin (P＜0.05) and down-regulated the ratio of p-Smad3/Smad3. HSP47 siRNA negative control had no significant effect on the expressions of ZO-1, vimentin and p-Smad3/Smad3 (P＞0.05). Conclusion HSP47 can promote the EMT of renal tubular epithelial cell which is possibly via the TGF-β1-Smad3 pathway.     

Localization of HSP47 in cisplatin-treated rat kidney: a possible role in tubulointerstitial damage

Background. A 47-kDa heat-shock protein (HSP47) is a major collagen-binding stress protein and is assumed to play an important role in the fibrotic process, but its role in cisplatin-induced tubulointerstitial fibrosis is not yet clear. To explore the possible role(s) of collagen-binding stress protein HSP47 in cisplatin-induced tubulointerstitial fibrosis, the expression of HSP47 was examined in cisplatin-treated rat kidneys. Methods. Eighteen male Wistar rats were divided into two groups; group I were age-matched controls and group II, animals were injected intraperitoneally with a single dose of cisplatin (6 mg/kg body weight). One hour after cisplatin injection, three rats from group II were killed along with control rats. The remaining rats in both groups were killed on the 7th, 14th, and 28th days of the experiment and the kidneys were collected for morphological and immunohistochemical study. The expression of collagen-binding HSP47 with various proteins implicated in phenotypic modulation (α-smooth muscle actin and vimentin) and fibrosis (type I and type III collagens) was examined in control and cisplatin-treated kidneys. Results. Cisplatin induced marked tubulointerstitial damage, including interstitial fibrosis, which was characterized by increased deposition of type I and type III collagens. Increased expression of HSP47 was also noted in and around the expanded interstitium in cisplatin-treated rats; by double-staining, HSP47-expressing cells were found to be α-smooth muscle actin-positive myofibroblasts and vimentin-positive tubular epithelial cells. In addition, colocalization of HSP47 and collagens was seen in and around the interstitial fibrosis in cisplatin-treated kidneys. Conclusion. From the results, we concluded that overexpression of HSP47 by phenotypically altered renal cells may play an important role in the excessive assembly of collagens and could thereby contribute significantly to the development of the tubulointerstitial fibrosis found in cisplatin-treated rat kidneys. Received: October 5, 1998 / Accepted: March 5, 1999     

靶向增殖诱导配体的RNA干扰对人结直肠癌裸鼠移植瘤的影响

目的 利用RNA干扰(RNAi)技术观察增殖诱导配体(APRIL)siRNA(pGC-shAPRIL重组干扰质粒)对裸鼠SW480移植瘤的影响.方法 建立裸鼠人结直肠癌移植瘤模型,待皮下瘤块长到一定体积,全部裸鼠分为APRIL siRNA组、空载体组和磷酸盐缓冲液(PBS)组,分别进行瘤块内注射.逆转录-聚合酶链反应(RT-PCR)检测移植瘤APRIL mRNA水平;瘤块和裸鼠肝肺苏木素-伊红(HE)染色病理检测;免疫组织化学法检测APRIL、核增殖抗原(Ki-67)、基质金属蛋白酶(MMP)-2蛋白表达.结果 APRIL siRNA组,与空载体组和PBS组比较,APRIL mRNA[(1.36±0.03)×10~7、(1.05±0.02)×10~8、(1.04±0.01)×10~8 copy/ml]和蛋白表达得分(2.00±0.40、7.00±0.45、8.00±0.40)明显降低(P<0.05);瘤块体积显著减小[(0.78±0.04)、(1.60±0.07)、(1.66±0.06)cm~3](P<0.05);与之相应Ki-67(2.00±0.45、8.00±0.54、7.00±0.44)和MMP-2(3.00±0.44、7.00±0.45、7.00±0.55)蛋白表达显著减弱(P<0.05).结论 RNAi敲低APRIL基因表达,抑制了裸鼠SW480移植瘤的生长和转移,打靶APRIL基因的RNAi技术有望成为人结直肠癌的治疗途径.     

Effect of heat shock protein 47 on collagen synthesis of keloid in vivo

Keloid is regarded as a fibroproliferative disorder with excessive accumulation of extracellular matrix. However, the molecular mechanism of keloid formation is not well understood and no treatment modality is consistently effective. Heat shock protein 47 (HSP47) is known as a collagen-specific molecular chaperone which plays a critical role in collagen biosynthesis. Results of our previous in vitro experiments demonstrated that HSP47 might be an important reason for excessive collagen accumulation in regard to keloid formation. Our objective is to investigate whether HSP47 has an influence on collagen metabolism in animal keloid models. The constructed plasmids, carrying HSP47-small hairpin RNA (shRNA), were transfected into animal keloid models, in comparison with the control groups. After transfection, the mRNA and protein expression of HSP47 and collage type I were detected by quantitative real-time PCR and Western blot. Both the mRNA and protein levels of HSP47 in animal keloid models were decreased dramatically after transfection of the HSP47- shRNA plasmid, in comparison with the control group. Following the down-regulation of HSP47, we found that the volume of animal keloid models and the major collagen expression were reduced correspondingly. Combining the results of our previous in vitro experiment results, we suggest that overexpression of HSP47 in keloid fibroblast cells could induce excessive collagen accumulation by enhancing collagen synthesis, which not only presents a possible mechanism of keloid formation, but also offers a therapeutic potential of RNA interference to HSP47 for the treatment of keloids and other fibroproliferative disorders.     

蛋白糖基化抑制剂对病理性瘢痕成纤维细胞Fas蛋白的表达与功能的影响

目的 研究N-糖链合成抑制剂衣霉素对病理性瘢痕成纤维细胞Fas蛋白的表达与诱导凋亡功能的影响.方法 瘢痕疙瘩及增生性瘢痕各5例,以健康皮肤为对照,免疫组织化学法检测组织中成纤维细胞Fas蛋白表达;组织块贴壁法培养成纤维细胞;Western Blot法及流式细胞术检测衣霉素处理及未处理各组成纤维细胞Fas蛋白水平的表达及凋亡率的变化.结果 病理性瘢痕及健康皮肤成纤维细胞胞质及胞膜中均可见Fas蛋白表达;增生性瘢痕、瘢痕疙瘩及健康皮肤成纤维细胞Fas蛋白糖基化水平依次降低,3组成纤维细胞在Fas单克隆抗体(Fas monoelonal antibody,FasMcAb)作用后凋亡率与Fas蛋白糖基化成正相关,衣霉素可明显降低病理性瘢痕成纤维细胞Fas蛋白糖基化水平,但对健康皮肤成纤维细胞Fas蛋白糖基化水平抑制作用不明显.结论 FasMcAb诱导病理性瘢痕成纤维细胞凋亡与成纤维细胞Fas蛋白糖基化水平成正相关,而衣霉素可显著降低成纤维细胞Fas蛋白糖基化水平.     

siRNA对胆管癌细胞自分泌运动因子表达的影响

目的研究针对自分泌运动因子(autotaxin,ATX)的小干扰RNA(siRNA)对人胆管癌细胞ATX基因表达的影响,探讨RNA干扰技术治疗胆管癌的前景。方法参考人黑色素瘤ENPP2基因序列,设计合成ATX-siRNA及随机阴性对照。在阳离子脂质体的介导下转染人胆管癌细胞HCCC-9810。分别于转染后24,48,72h收集细胞,用半定量RT-PCR方法检测转染后ATXmRNA表达的变化,并与对照组及ATX表达抑制剂IL-1β的作用进行比较。结果体外合成的siRNA在转染胆管癌细胞24h后ATXmRNA的表达降低,48h抑制作用最为明显,与对照组比较差异有显著性意义(P<0.01),并明显强于IL-1β(P<0.01)。结论siRNA可有效地抑制胆管癌细胞ATX的表达,从而有可能阻断ATX对肿瘤细胞运动的促进作用。