基于TGF-β_(1)/Smads信号通路探讨大蒜素对2型糖尿病大鼠肾纤维化的影响

目的:探讨大蒜素对2型糖尿病(type 2 diabetes mellitus,T2DM)大鼠肾纤维化和TGF-β_(1)/Smads信号通路的影响以及大蒜素对T2DM所致肾纤维化的作用机制。方法:将50只SD大鼠随机分为正常对照组、模型组和大蒜素低剂量组(5 mg/kg)、大蒜素中剂量组(10 mg/kg)、大蒜素高剂量组(20 mg/kg),每组10只。正常对照组大鼠常规饲养,其余各组采用高糖高脂饲料喂养加腹腔注射链尿佐菌素的方法复制T2DM大鼠模型。造模完成后,大蒜素各剂量组大鼠腹腔注射相应剂量大蒜素溶液,正常对照组及模型组腹腔注射等剂量生理盐水,每天1次,共4周。干预4周后,测定各组大鼠空腹血糖水平,称量体质量;生化分析法测定24h尿蛋白(24 hour urine protein,24h UP)、血清尿素氮(blood urea nitrogen,BUN)、血清肌酐(serum creatinine,SCr)表达水平;苏木精-伊红染色法(hematoxylin-eosin staining,HE)进行肾组织病理学检查;Masson染色进行肾组织纤维化检查并计算胶原容积分数(collagen volume fraction,CVF);免疫组织化学(immunohistochemistry,IHC)法检测肾组织中转化生长因子β_(1)(transforming growth factor-β_(1),TGF-β_(1))、磷酸化Smad2(phospho-Smad2,p-Smad2)、p-Smad3蛋白表达以及Ⅰ型胶原蛋白(collagenⅠ,ColⅠ)和Ⅲ型胶原蛋白(collagenⅢ,ColⅢ)表达。结果:与正常对照组比较,模型组大鼠肾小球增大、系膜基质增厚、肾小管上皮细胞空泡变性、炎性细胞浸润,大鼠空腹血糖、24h UP、BUN、SCr、CVF、TGF-β_(1)、p-Smad2、p-Smad3、Col I、ColⅢ均升高,体质量下降;与模型组比较,大蒜素中、高剂量组大鼠空腹血糖水平降低、体质量升高(P<0.05),24h UP和血清BUN、SCr水平降低(P<0.01),病理学改变改善;与模型组比较,大蒜素低、中、高剂量组大鼠肾组织纤维化改善,肾组织CVF降低(P<0.01);与模型组比较,大蒜素中、高剂量组大鼠肾组织TGF-β_(1)、p-Smad2、p-Smad3、Col I、ColⅢ蛋白表达下调(P<0.01)。结论:大蒜素对T2DM大鼠肾纤维化具有抑制作用,其机制可能与大蒜素调控TGF-β_(1)/Smads信号通路进而抑制细胞外基质生成有关。

Expressions of type I collagen, α2 integrin and β1 integrin in sclera of guinea pig with defocus myopia and inhibitory effects of bFGF on the formation of myopia

AIM:To investigate the expressions of type I collagen, α2 integrin and β1 integrin in the posterior sclera of guinea pigs with defocus myopia and whether basic fibroblast growth factor (bFGF) injection inhibits the formation and development of myopia by upregulating the expression of type I collagen, α2 integrin and β1 integrin. METHODS:After 14 days of treatment, the refractive state and axial length were measured and the levels of type I collagen, α2 integrin and β1 integrin were assayed in the posterior sclerae of groups of guinea pigs that wore a monocular-7D polymethylmethacrylate (PMMA) lens or had -7D lens wear followed by the peribulbar injection of Phosphate Buffer Solution (PBS) or bFGF. The untreated fellow eye served as a control. Guinea pigs with no treatment served as normal group. ·RESULTS:The results showed that 14 days of monocular defocus increased axial eye length and refraction, while bFGF delivery inhibited them markedly. Further, it was also found that the monocular-7D lens could decrease the levels of type I collagen, α2 integrin and β1 integrin expressions, while, unlike PBS, bFGF increased them significantly in comparison to contralateral control eyes and normal eyes. CONCLUSION:bFGF can prevent the formation anddevelopment of defocus myopia by upregulating the expressions of type I collagen, α2 integrin and β1 integrin. Taken together, our results demonstrate that bFGF promotes sclera remodeling to prevent myopia in guinea pigs.

血清COL10A1、TK1、MIP-3α水平与胃癌患者病理特征的关系及其对腹膜转移的诊断价值研究

目的研究血清X型胶原α1链(COL10A1)、胸苷激酶1(TK1)、巨噬细胞炎症蛋白-3α(MIP-3α)水平与胃癌患者病理特征的关系及其对胃癌腹膜转移的诊断价值。方法以2021年1月至2022年12月邢台市人民医院收治的96例胃癌患者作为恶性组,其中有腹膜转移27例,无腹膜转移69例;选取同期收治的104例胃良性病变患者作为良性病变组,选取112例健康体检者作为健康对照组。比较各组血清COL10A1、TK1、MIP-3α水平及不同病理特征、有无腹膜转移胃癌患者血清COL10A1、TK1、MIP-3α水平,采用受试者工作特征(ROC)曲线分析血清COL10A1、TK1、MIP-3α对胃癌患者腹膜转移的诊断价值。结果恶性组血清COL10A1、MIP-3α、TK1水平高于健康对照组、良性病变组,良性病变组血清COL10A1、MIP-3α水平高于健康对照组,差异均有统计学意义(P<0.05)。低/未分化、有脉管浸润、肿瘤临床病理分期(TNM)分期Ⅲ~Ⅳ期胃癌患者血清COL10A1、TK1、MIP-3α水平高于高/中分化、无脉管浸润、TNM分期Ⅰ~Ⅱ期患者(P<0.05)。有腹膜转移胃癌患者血清COL10A1、TK1、MIP-3α水平高于无腹膜转移患者(P<0.05)。血清COL10A1、TK1、MIP-3α单项及3项联合检测诊断胃癌腹膜转移的曲线下面积(AUC)分别为0.722(95%CI:0.621~0.809)、0.749(95%CI:0.651~0.832)、0.736(95%CI:0.637~0.821)、0.853(95%CI:0.766~0.917),3项联合检测诊断的AUC大于3项单独检测(Z=1.990、3.617、2.986,P<0.001)。结论胃癌的发生导致患者血清COL10A1、TK1、MIP-3α水平升高,同时随着胃癌患者病情的进展,血清COL10A1、TK1、MIP-3α水平升高,且3项指标联合检测对胃癌患者腹膜转移具有较好的诊断价值。

Changes on lysosomal compartment during PMA-induced differentiation of THP-1 monocytic cells: Influence of type I and type IV collagens

In this work, the influence of different substrate adhesion during phorbol-12-myristate-13-acetate (PMA)-induced differentiation of THP-1 monocytic cell line was studied. In particular, by morphocytochemical and cytometric approaches, the influence of type I and type IV collagens in an experimental model representative of three phases (initial, intermediate and terminal) of monocyte-macrophage transition was analyzed. The cells in these three phases of differentiation were obtained by using 6, 30 e 60 nM PMA. In this experimental model, referring to adhesion to glass as control, by using the azo-dye coupling method, we have considered the analysis of Acid Phosphatase (AcP) activity as a marker of differentiated status expression, in relation to the acquisition of macrophagic phenotype. Endosomal/lysosomal system was further characterized by taking into account the uptake of fluorescent probe LysoTracker Red. Fluorochromization in the various experimental conditions was analyzed morphologically (fluorescence microscopy) and quantitatively (static cytometry). Data related to lysosome compartment were integrated, from a cytokinetic point of view, by flow cytometry measurements of DNA/protein content. Our results have indicated that type I and type IV collagens were able to influence, with respect to glass adhesion, various differentiation phases. Type I collagen showed the higher effects in the condition of high differentiation (60 nM PMA), causing an increase in AcP activity and lysosomal system. Type IV collagen, besides determining effects on lysosomal compartment of intermediate and terminally differentiated cells, influenced mainly proliferative activity of cells with initial differentiation level (6 nM PMA).

EFFECTS OF TGF-β_1 ON CELLULAR PROLIFERATION ANDEXPRESSION OF TYPE Ⅲ COLLAGEN BY CULTURED RATRENAL INTERSTITIAL FIBROBLASTS

Objective To investigate the effects of TGF- β1 on proliferation and type N collagen mRNAexpression of rat renal interstitial libroblasts in vitro for elucidating the role of fibroblasts in renal interstitialfibrosis. Methods The cells were cultured in media containing various concentrations of TGF- β1. Theproliferation and the type Ⅲ collagen mRNA expression of the cells were assayed with MTT method andRT- PCR respectively. Results TGF- β1, has a stimulating proliferation effect with dose- dependence and aincreasing expression of type Ⅲ collagen mRNA with both dose- and time- dependence to the renal fibroblasts. Conclusion It is suggested that TGF- β, is involved in proliferation of renal fibroblasts and their type Ⅲcollagen mRNA expression, and may play an important role in renal interstitial fibrosis.

结直肠腺癌中COL9A1蛋白的表达及其临床意义

目的:探讨微环境中Ⅸ型胶原α1(collagen type IX alpha 1 chain,COL9A1)在结直肠腺癌中的表达及其与肿瘤进展的相关性和临床意义。方法:收集2012年1月至2021年1月手术切除的结直肠癌标本408例,采用免疫组织化学检测结直肠腺癌肿瘤组织及癌旁正常组织中COL9A1表达,同时检测肿瘤组织中肿瘤蛋白53(tumor protein 53,P53)和错配修复(mismatch repair,MMR)蛋白MLH1、MSH6和PMS2的表达,统计分析COL9A1的表达与各临床病理特征参数的关系,以及与P53突变和MMR状态的相关性,并分析COL9A1阳性表达患者的预后情况。结果:COL9A1在结直肠腺癌肿瘤组织中表达显著低于癌旁正常组织(P<0.001);COL9A1的表达与肿瘤浸润深度、临床分期和肠系膜淋巴结转移有关(χ^(2)=16.943、89.031和84.814;均P<0.001),而与P53突变和MMR状态无关(χ^(2)=0.677、1.260,均P>0.05);Log-rank检验显示COL9A1阴性表达患者的无进展生存期(progression free survival,PFS)和总体生存期(overall survival,OS)显著低于COL9A1阳性表达患者(分别P<0.001,P=0.040)。结论:结直肠腺癌中COL9A1蛋白的表达缺失与肿瘤浸润及转移密切相关,并提示不良预后,这可为结直肠癌预后评估、药物筛选等提供可能的分子标志物和治疗策略。

3D Collagen Gels:A Promising Platform for Dendritic Cell Culture in Biomaterials Research

The three-dimensional(3D)cell culture system has garnered significant attention in recent years as a means of studying cell behavior and tissue development,as opposed to traditional two-dimensional cultures.These systems can induce specific cell reactions,promote specific tissue functions,and serve as valuable tools for research in tissue engineering,regenerative medicine,and drug discovery.This paper discusses current developments in the field of three-dimensional cell culture and the potential applications of 3D type 1 collagen gels to enhance the growth and maturation of dendritic cells.

Production and Characterization of Recombinant Rat Non-Collagen Domain of α3 Chain of Type IV Collagen α3 (IV) NC1 Antigen

The glomerulonephritis disease is characterized by inflammation of glomeruli or small blood vessels in the kidney that causes kidney diseases. The reason of glomerulonephritis disease is to deposit the anti-GBM auto antibody in the glomerular basement membrane. The type IV collagen is the main component of glomerular basement membrane that has α3 chain of type (IV) collagen of non-collagenous domain which contains N-terminal 7S domain, a triple helical collagenous domain and C-terminal non-collagenous glomerular domain (NC1). The amino terminal of α3 (IV) NC1 that induces the Experimental Autoimmuno Glomerulonephritis (EAG) in rat model has been identified. The recombinant rat α3 (IV) NC1 antigen has nine amino acid spans that are consistent with antibody or T cell epitope that induces in EAG. The research is carried out on the recombinant rat α3 (IV) NC1 production, purification, quantification, and characterization. The circulation of anti-GBM antibody in glomerular basement membrane can be measured by the ELISA assay. In addition, the recombinant rat antigen is secreted in HEK293 cell supernatant that is purified by Anti-FLAG M2 monoclonal IgG antibody affinity column and characterized and quantified by SDS-PAGE gel electrophoresis and Western blotting techniques.

终末期肾脏病患者桡动脉中膜钙化与核心结合因子α_1及Ⅰ型胶原的关系研究

目的探讨终末期肾脏病（ESRD）患者桡动脉中膜钙化与核心结合因子α1（Cbfα1）及Ⅰ型胶原的关系。方法选择2009年5月—2012年12月在河北医科大学第四医院肾内科住院初次行前臂动-静脉内瘘成形术的ESRD患者62例。采用von kossa染色法观察桡动脉钙化情况,并根据组织钙化积分将患者分为无钙化组（〈1.0分）和钙化组（1.0~4.0分）;采用免疫组织化学法观察Cbfα1及Ⅰ型胶原的表达情况;检测相关临床指标〔空腹血清钙（Ca）、血清磷（P）、三酰甘油（TG）、总胆固醇（TC）、低密度脂蛋白（LDL）、高密度脂蛋白（HDL）、血红蛋白（Hb）、碱性磷酸酶（ALP）、铁蛋白、甲状旁腺素（iPTH）和C反应蛋白（CRP）,血压,体质指数（BMI）〕。结果62例ESRD患者桡动脉标本中25例（40.3%）发生血管钙化,其中轻中度钙化22例（35.5%）,重度钙化3例（4.8%）,均发生在血管中膜。根据组织钙化积分,无钙化组37例,钙化组25例。钙化组桡动脉中膜均有Cbfα1及Ⅰ型胶原的阳性表达;无钙化组桡动脉中膜31例（83.8%）Cbfα1阳性表达,19例（51.4%）Ⅰ型胶原阳性表达。钙化组Cbfα1及Ⅰ型胶原的阳性表达积分均高于无钙化组（P〈0.05）。钙化组与无钙化组的年龄、BMI、血压、Ca、iPTH、TG、TC、LDL、HDL、Hb、CRP、铁蛋白、ALP比较,差异无统计学意义（P〉0.05）;钙化组血清P水平高于无钙化组（P〈0.05）。钙化组Cbfα1阳性表达积分与血清P呈正相关（r=0.679,P〈0.05）,与年龄、BMI、血压、血清Ca、TG、TC、LDL、HDL、iPTH、Hb、CRP、铁蛋白、ALP无相关性（P〉0.05）;Ⅰ型胶原阳性表达积分与血清P呈正相关（r=0.393,P〈0.05）,与年龄、BMI、血压、血清Ca、TG、TC、LDL、HDL、iPTH、Hb、CRP、铁蛋白、ALP无相关性（P〉0.05）;Cbfα1阳性表达积分与Ⅰ型胶原阳性表达积分呈正相关（r=0.307,P〈0.05）。结论 ESRD患者血管中膜钙化发生率较高,其发生机制可能与高磷诱导血管平滑肌细胞表型转化,促进I型胶原表达增加有关,为临床进一步研究提供了参考依据。

绝经后妇女骨密度与Ⅰ型胶原α_1链及α_2链基因多态性相关性研究

目的探讨人Ⅰ型胶原α1链(COL1A1)及α2链(COL1A2)基因型与绝经后妇女骨密度相互关系。方法选取年龄≥42岁绝经后妇女(自然绝经≥2年)231例,采用双能X线吸收法(DEXA)测定其全身、腰椎2～4(L2～4)、股骨颈(Neck)、Ward?三角和大转子区等部位的骨密度(BMD)值,并采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法检测外周血白细胞基因组Ⅰ型胶原α1链及α2链基因型。结果231例受试对象中,Ⅰ型胶原α1链PCR扩增产物未发现ACCB7I酶切位点,SpⅠ结合位点不存在G→T突变,Ⅰ型胶原α1链基因型均为SS型;Ⅰ型胶原α2链基因型分别为EE型113例,Ee型91例,ee型27例(分别占48.9%、39.4%、11.7%),等位基因频率E和e各为68.6%、31.4%。基因型分布符合Hardy-weinberg定律。携带EE基因型的个体比Ee基因型和ee基因型个体的骨密度值为低,但只在腰椎侧位(L2-L4)、股骨颈(Neck)、大转子(Troch)、Ward?s三角(Ward?s)等部位的骨密度值EE基因型比Ee基因型携带者明显降低(P<0.05)。结论广州地区绝经后妇女COL1A1SpⅠ结合位点不存在G→T突变。COL1A2基因EE型个体较Ee基因型及ee基因个体的骨密度值低,绝经后妇女骨密度与COL1A2基因多态性存在一定相关性。

广州地区部分汉族人群骨密度与I型胶原α_1及α_2链基因多态性相关性

目的探讨I型胶原α1链(COL1A1)及α2链(COL1A2)基因型与广州地区部分汉族人群骨密度相互关系。方法选取成年个体628例[年龄20￣79岁,平均(53.4±15.9)岁],双能X线吸收法测定其全身、腰椎2￣4(L2￣4)、股骨颈、Ward氏三角和大转子区等部位的骨密度值,采用PCR-RFLP方法检测外周血白细胞基因组COL1A1及COL1A2基因型。结果628例受试对象中,未能观察到I型胶原α1链Sp1结合位点G→T突变,COL1A1基因型均为SS型;COL1A2基因型分别为EE型311例,占49.5%;Ee型252例,40.1%;ee型65例,10.4%。基因及基因型分布符合Hardy-weinberg平衡定律。不同基因型个体的骨密度值没有显著差异。结论在汉族人群中,不存在COLIA1Sp1结合位点的多态性,COLIA2EcoRI位点多态性与骨密度的关系不密切,尚不能作为筛查广州地区骨质疏松症高危人群的候选基因。

半乳糖凝集素1在退变椎间盘中的差异表达

背景:半乳糖凝集素1调控诸多组织、器官的生理病理过程,其与椎间盘退变的关系尚不明确。目的:分析半乳糖凝集素1在不同退变程度椎间盘中的差异性表达,并探讨其对大鼠椎间盘退变的影响。方法:收集新疆医科大学第一附属医院15例患者的椎间盘标本,采用Pfirrmann分级后检测半乳糖凝集素1在不同退变程度椎间盘中的差异性表达。建立SD大鼠腰椎退变模型,随机分为3组,造模后隔日进行干预,对照组、模型组分别尾静脉注射生理盐水,半乳糖凝集素1干预组尾静脉注射半乳糖凝集素1重组蛋白,1次/d,各组均干预7 d;造模术后8周使用Bruker Pharmascan 7.0T核磁共振仪进行Pfirrmann分级后观察椎间盘的病理变化,并检测椎间盘中半乳糖凝集素1、Ⅱ型胶原及蛋白聚糖的表达。结果与结论:①qRT-PCR、免疫组织化学染色及Western Blot结果提示随着椎间盘退变的加重,半乳糖凝集素1表达逐渐减少,3组之间比较差异有显著性意义(P<0.05);②术后8周,大鼠腰椎MRI提示半乳糖凝集素1干预可降低改良Pfirrmann分级;苏木精-伊红染色提示半乳糖凝集素1干预减少椎间盘退变的病理改变;免疫组化及Western blot结果提示半乳糖凝集素1干预在增加椎间盘中半乳糖凝集素1表达的同时减少Ⅱ型胶原及蛋白聚糖的降解,3组之间相比差异有显著性意义(P<0.05);③结果提示随着椎间盘退变程度的加重半乳糖凝集素1表达逐渐减少;半乳糖凝集素1干预可以延缓大鼠椎间盘针刺退变模型的进展。

LncRNA COL1A2-AS1调控人瘢痕疙瘩成纤维细胞功能的研究

目的研究长链非编码RNA(LncRNA)Ⅰ型胶原α2自然反义转录物1(COL1A2-AS1)对人瘢痕疙瘩成纤维细胞增殖、凋亡、迁移的影响。方法在COL1A2-AS1的功能研究中将人成纤维细胞分为3组:空白组、空载组、COL1A2-AS1-过表达组。qRT-PCR检测miR-181a-5p、TGF-β1、Smad7、Col-Ⅲ、COL1A2-AS1的表达。CCK-8法检测细胞增殖率,流式细胞术检测细胞凋亡,Transwell法检测细胞迁移,Western blot检测TGF-β1、Smad7、Col-Ⅲ蛋白的表达水平。双荧光素酶报告实验验证COL1A2-AS1与所预测的靶标miR-181a-5p的结合关系。结果与空载组比较,COL1A2-AS1-过表达组的人成纤维细胞增殖OD值、迁移细胞数以及Col-Ⅲ的表达都明显下调(P<0.05),而TGF-β1和Smad7的表达水平都明显升高(P<0.05)。与空载组比较,COL1A2-AS1-过表达组细胞的凋亡率增加(P<0.05)。另外,与空载组比较,COL1A2-AS1-过表达组明显抑制miR-181a-5p的表达(P<0.05),且经过双荧光素酶报告实验验证COL1A2-AS1和miR-181a-5p可直接结合。结论COL1A2-AS1直接靶向抑制miR-181a-5p的表达,并抑制人瘢痕疙瘩成纤维细胞的增殖和迁移,促进细胞的凋亡。

慢性肾功能不全患者血清Ⅳ型胶原和α_1-微球蛋白测定评价

目的 为了探讨慢性肾功能不全患者血清Ⅳ型胶原 (typeⅣcollagen ,Ⅳ -C)和α1 -微球蛋白 (α1 -microglobulin ,α1 -MG)含量的变化和临床意义。方法 76例慢性肾功能不全患者以血肌酐 (Cr)水平分为氮质血症组和尿毒症组 ,用放免分析法对全部患者血清Ⅳ -C和α1 -MG进行检测。结果 氮质血症组与尿毒症组血清Ⅳ -C和α1 -MG分别与正常对照组相比 ,相差均有显著性 (P<0 .0 5) ,尿毒症组血清α1 MG水平明显高于氮质血症组 (P <0 .0 1 ) ,尿毒症组与氮质血症组血清Ⅳ -C水平差异无显著性 (P >0 .0 5)。结论 血Ⅳ -C和α1 -MG测定可作为肾功能不全的实验室指标之一。

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.

Herbal compound 861 regulates mRNA expression of collagen synthesis- and degradation-related genes in human hepatic stellate cells

AIM:To identify the role of herbal compound 861(Cpd 861)in the regulation of mRNA expression of collagen synthesis-and degradation-related genes in human hepatic stellate cells(HSCs). METHODS:mRNA levels of collagen typesⅠand III,matrix metalloproteinase 1(MMP-1),matrix metalloproteinase 2(MMP-2),membrane type-1 matrix metalloproteinase(MT1-MMP),tissue inhibitor of metalloproteinase 1(TIMP-1),and transforming growth factorβ1(TGF-β1)in cultured-activated HSCs treated with Cpd 861 or interferon-g(IFN-g)were determined by real-time PCR. RESULTS:Both Cpd 861 and IFN-g reduced the mRNA levels of collagen typeⅢ,MMP-2 and TGF-β1.Moreover, Cpd 861 significantly enhanced the MMP-1 mRNA levels while down-regulated the TIMP-1 mRNA expression, increasing the ratio of MMP-1 to TIMP-1 to(6.3+0.3)- fold compared to the control group. CONCLUSION:The anti-fibrosis function of Cpd 861 may be mediated by both decreased interstitial collagen sythesis by inhibiting the transcription of collagen type Ⅲand TGF-β1 and increased degradation of these collagens by up-regulating MMP-1 and down-regulating TIMP-1 mRNA levels.

Urinary type IV collagen excretion predicts an increased urinary albumin-to-creatinine ratio in normoalbuminuric patients with diabetes

Aims: We evaluated whether urinary excretion of type IV collagen (U-COL) may predict an increase in the urinary albumin-to-creatinine ratio (ACR) and what factors regulate U-COL in 145 normoalbuminuric patients with type 2 diabetes. Methods: We measured HbA1c, systolic blood pressure (SBP), urinary 8-hydroxydeoxyguanosine (8-OHdG) and monocyte chemoattractant protein (MCP)-1 at start of this study (Baseline), ACR and U-COL in addition to these measurements at one year later (Evaluation-1), and ACR and SBP after two years of the Evaluation-1 (Evaluation-2). The relationships were investigated between the increase of ACR and the U-COL. The effect of angiotensin receptor blockers (ARB) treatment on the correlations between U-COL and ACR at Evaluation-2 on one hand, and between U-COL and percent change of ACR on the other, was also analyzed. Furthermore, we investigated whether the increase in 8-OHdG and in MCP-1 in a year prior to the Evaluation-1 were risk factors of the rise in U-COL levels. Results: Both U-COL and SBP at Evaluation-1, but not ARB treatment, were independent risk factors for an increased ACR after 2 years. ARB treatment significantly suppressed the increase in ACR after 2 years in patients with higher U-COL excretion. The percentage changes in 8-OHdG (%8-OHdG) and MCP-1 (%MCP-1) in one year prior to Evaluation-1 measurements are independent risk factors for U-COL. HbA1c and SBP values one year prior to Evaluation-1 are independent risk factors not only for %8-OHdG but also, for baseline U-COL. The %8-OHdG is an independent risk factor for %MCP-1. Conclusions: U-COL may predict an increase in the ACR. The U-COL seems to be increased with oxidative stress and inflammation induced by past hyperglycemia.

乳腺癌组织中COL11A1表达与ER、PR、HER-2和Ki-67的相关性分析

目的探讨乳腺癌组织中Ⅺ型胶原α1(COL11A1)表达与雌激素受体(ER)、孕激素受体(PR)、人表皮生长因子受体-2(HER-2)和Ki-67的关系。方法采用免疫组化EnVision两步法检测18例乳腺纤维腺瘤组织和120例乳腺癌组织(36例原位癌组织、84例浸润性癌组织)中COL11A1的表达,同时对乳腺癌组织进行ER、PR、HER-2和Ki-67免疫组化检测,对HER-2(2+)进行荧光原位杂交检测;分析COL11A1表达与乳腺癌临床病理特征和多种免疫标记(ER、PR、HER-2和Ki-67)的关系。结果免疫组化结果显示COL11A1主要表达于乳腺癌细胞中。在纤维腺瘤组织中COL11A1表达呈弱阳性。COL11A1在原位癌中表达高于浸润性乳腺癌(P<0.05)。COL11A1表达与乳腺癌患者的年龄、部位、肿块大小和淋巴结转移无关(P>0.05),而中、高分化组织的COL11A1表达水平高于低分化组织,差异有统计学意义(P<0.05)。进一步分析COL11A1与乳腺癌其他免疫标记间的相关性发现,在Ki-67高表达组织中COL11A1低表达的比例更高,差异有统计学意义(P<0.05),而其他3种标记与COL11A1的表达无关(P>0.05)。结论COL11A1在浸润性乳腺癌中表达较原位癌低,在低分化乳腺癌中表达水平较中高分化更低,且与Ki-67表达有关,提示COL11Al表达在乳腺癌发生发展过程中是动态变化的,为乳腺癌的诊断治疗提供潜在标记物。

Promotion of minTBP-1-PRGDN on the attachment,proliferation and collagen I synthesis of human keratocyte on titanium

AIM: To investigate the influence of minTBP-1-PRGDN on the attachment,proliferation and collagen I synthesis of human keratocyte on titanium(Ti) surface. · METHODS: The chimeric peptide RKLPDAPRGDN(minTBP-1-PRGDN) was synthesized by connecting RKLPDA(minTBP-1) to the N-terminal of PRGDN,the influence of minTBP-1-PRGDN on the attachment,proliferation and collagen I synthesis of human keratocyte on Ti surface were tested using PRGDN and minTBP-1 as controls. The keratocytes attached to the surface of Ti were either stained with FITC-labeled phalloidin and viewed with fluorescence microscope or quantified with alamar Blue method. The proliferation of keratocytes on Ti were quantified with 3-(4,5-dim-ethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide uptaking methods. The secretion of type I collagen was determined using an ELISA kit. ·RESULTS: The results showed that minTBP-1-PRGDN at a concentration of 100ng/mL was the most potent peptide to enhance the attachment of human keratocytes to the surface of Ti(1.40±0.03 folds,P =0.003),to promote the proliferation(1.26 ±0.05 folds,P =0.014) and the synthesis of type I collagen(1.530 ±0.128,P =0.008). MinTBP-1 at the same concentration could only promote the attachment(1.13±0.04 folds,P =0.020) and proliferation(1.15±0.06 folds,P =0.021),while PRGDN had no significant influence(P 】0.05). ·CONCLUSION: Our data show that the novel chimericpeptide minTBP-1-PRGDN could promote the attachment,proliferation and type I collagen synthesis of human keratocytes on the surface of titanium.

Type XIX collagen: a promising biomarker from the basement membranes

Among collagen members in the collagen superfamily,type XIX collagen has raised increasing interest in relation to its structural and biological roles.Type XIX collagen is a Fibril-Associated Collagen with Interrupted Triple helices member,one main subclass of collagens in this superfamily.This collagen contains a triple helix composed of three polypeptide segments aligned in parallel and it is associated with the basement membrane zone in different tissues.The molecular structure of type XIX collagen consists of five collagenous domains,COL1 to COL5,interrupted by six non-collagenous domains,NCI to NC6.The most relevant domain by which this collagen exerts its biological roles is NCI domain that can be cleavage enzymatically to release matricryptins,exerting anti-tumor and anti-angiogenic effect in murine and human models of cancer.Under physiological conditions,type XIX collagen expression decreases after birth in different tissues although it is necessary to keep its basal levels,mainly in skeletal muscle and hippocampal and telencephalic interneurons in brain.Notwithstanding,in amyotrophic lateral sclerosis,altered transcript expression levels show a novel biological effect of this collagen beyond its structural role in basement membranes and its anti-tumor and anti-angiogenic properties.Type XIX collagen can exert a compensatory effect to ameliorate the disease progression under neurodegenerative conditions specific to amyotrophic lateral sclerosis in transgenic SOD1 G93 A mice and amyotrophic lateral sclerosis patients.This novel biological role highlights its nature as prognostic biomarker of disease progression in and as promising therapeutic target,paving the way to a more precise prognosis of amyotrophic lateral sclerosis.