Inhibition of α_1(Ⅰ) collagen gene in vitro transcription by antisense oligodeoxynucleotides

Objective and Methods: Excessive accumulation of collagen typeⅠ and type Ⅲ causes the formation of keloids and hypertrophic scars. To understand the mechanism by which antisense oligodeoxynucleotide (Oligo) acts on in vitro transcrption α1 (I) collagen gene, isotopes (α-32pGTP) was incorporated into 2 SP6 in vitro transcription systems. Results and Conclu- sion: Oligo 2 (at the transcription start region) could effectively inhibit in vitro transcription of pGEM3-Col13 and the control (random oligodeoxynucleotides) showed no inhibition. However, oligo 1 (at the transcription start region) obviously inhibited the in vitro transcription of pGEM3-Col14, while Oligo 2, which targeted at the down stream region (about 200 bp) of the promoter showed no significant inhibition effect.

氧化苦参碱对皮肤创面愈合中PCNA、α-SMA及Type Ⅰ collagen的影响

目的探讨氧化苦参碱对小鼠皮肤创面愈合中血清增殖细胞核抗原(PCNA)、α-平滑肌肌动蛋白(α-SMA)及细胞Ⅰ型胶原蛋白(Type Ⅰ collagen)的影响。方法昆明小鼠背部手术制备1.5 cm×1.5 cm全层皮肤缺损创面模型。自第1 d始,除对照组给予等量生理盐水外,余各组分别按20、40、80 mg/kg给予氧化苦参碱。Van Gieson纤维胶原染色法观察小鼠背部皮肤创面组织胶原纤维的表达;免疫组学法评价创面组织中PCNA、α-SMA及Type Ⅰ collagen的表达。结果Van Gieson纤维胶原染色显示,氧化苦参碱可促进新生肉芽组织、毛细血管及新生纤维胶原生长。免疫组学研究显示,在第7 d时,氧化苦参碱20、40、80 mg/kg使小鼠皮肤创面组织中PCNA表达明显升高(P<0.05);在第9 d、11 d时,氧化苦参碱20 mg/kg使小鼠皮肤创面组织中α-SMA显著增加;氧化苦参碱20 mg/kg在第3 d、11 d,氧化苦参碱40 mg/kg在第3 d,氧化苦参碱80 mg/kg在第3 d、7 d引起Type Ⅰ collagen的表达显著升高(P<0.05)。结论氧化苦参碱能增加皮肤创面愈合中PCNA、α-SMA及Type Ⅰ collagen的表达。

白细胞介素1β与机械牵拉共同作用角膜成纤维细胞CollagenⅠ及Lumican的表达

背景:继发性圆锥角膜是角膜屈光手术后的并发症之一,但其发生机制尚不清楚。目的:探讨白细胞介素1β与机械牵拉对角膜成纤维细胞CollagenⅠ和Lumican表达的影响。方法:体外培养角膜成纤维细胞,对其施加不同幅度(5%,10%,15%)的机械牵拉和不同质量浓度的白细胞介素1β,共同作用12,24,36 h,通过实时荧光定量PCR检测CollagenⅠ和Lumican m RNA的表达变化。结果与结论:(1)白细胞介素1β单独作用12 h使CollagenⅠα1的表达降低(P<0.05),作用24 h使Lumican的表达升高(P<0.05);(2)5%牵拉单独作用24,36 h使CollagenⅠα1表达升高(P<0.05);10%和15%牵拉单独作用12,24,36 h使CollagenⅠα1和CollagenⅠα2的表达降低(P<0.05);(3)5%牵拉单独作用12 h使Lumican表达升高(P<0.05),而10%和15%牵拉单独作用12 h使Lumican表达降低(P<0.05);5%,10%,15%牵拉24 h和36 h时使Lumican表达升高(P<0.05);(4)白细胞介素1β和机械牵拉共同作用24,36 h使CollagenⅠα1和CollagenⅠα2表达降低,Lumican表达升高;(5)结果提示,白细胞介素1β能抑制CollagenⅠ的合成,而促进Lumican的表达。低幅度机械牵拉能促进角膜成纤维细胞胶原的合成,中高幅度机械牵拉抑制其胶原的合成。两者共同作用能抑制角膜成纤维细胞胶原合成且促进Lumican的表达。

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。

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。

TGF-β/Smad信号转导通路对紫外线致人工皮肤光损伤中MMP-1、pro-collagen Ⅰ mRNA表达影响的初步研究

目的探讨人工皮肤光损伤中TGF-β/Smad信号转导通路与基质金属蛋白酶1及Ⅰ型前胶原蛋白的相互作用。方法以紫外线照射人工皮肤后,通过Real-Time RT-PCR法(荧光染料掺入法)检测其中基质金属蛋白酶1、Ⅰ型前胶原蛋白、TGFβRⅠ及TGFβRⅡmRNA的表达量。结果紫外线使人工皮肤中基质金属蛋白酶1(MMP-1)的mRNA表达量明显增加,而Ⅰ型前胶原蛋白mRNA的表达下调(P<0.05),TGFβRⅡmRNA表达显著下调(P<0.01);加入TGF-β1后MMP-1表达显著下调(P<0.01),Ⅰ型前胶原蛋白及TGFβRⅡmRNA表达显著增高(P<0.01);而UV照射后8小时加入TGF-β1,MMP-1表达量较对照组高(P<0.05),Ⅰ型前胶原蛋白及TGFβRⅡmRNA表达量均较对照组低(P<0.05)。结论 UV可以抑制人工皮肤中Ⅰ型前胶原mRNA的表达、上调MMP-1的表达,而这种调控作用可能与TGF-βRⅡ的表达受抑制,TGF-β/Smad信号传导通路被削弱有关。

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.

Effects of Icariin on Expression of OPN mRNA and Type ⅠCollagen in Rat Osteoblasts in Vitro

To study the effects of Icariin on expression of osteopontin （OPN） mRNA and type Ⅰ collagen in rat osteoblasts in vitro and to explore its possible mechanisms in preventing osteoporosis. OB was isolated from calvaria of new-born new-born fetal Sprague-Dawley （SD） rats by means of modified sequential collagenase digestion and incubated in MEM medium and the cell morphology was observed under inverted phase contrast microscope, OB was identified by alkaline phosphatase （ALP） staining. Different concentration （0.1μg/mL, 1.0 μg/mL, 10 μ/mL） of Icariin was added to the OB and incubated. The effect of Icariin on the proliferation and osteogenesis of OB was monitored by MTT analysis. The expression of type l collagen was estimated with immunohistochemistry techniques. The expression levels of mRNA of OPN in the cells in every group were examined by reverse-transcriptase ploymerase chain reaction （RT-PCR）. The expression of OPN mRNA and type Ⅰ collagen was strengthened gradually with the increase of Icariin concentration and peaked with 10 μg/mL Icariin on the 5th day. Icariin could significantly promote the expression of OPN mRNA and type Ⅰ collagen in rat osteoblasts in vitro. The levels of expression of OPN mRNA and type Ⅰ collagen were changed with different concentration of Icariin. Icariin could effectively prevent and treat osteoporosis and promote the bone formation.

TypeⅠinositol 1, 4, 5-triphosphate receptors increase in kidney of mice with fulminant hepatic failure

AIM： To delineate the mechanisms of renal vasoconstriction in hepatorenal syndrome （HRS）, we investigated the expression of type I inositol 1, 4, 5-triphosphate receptors （IP3R I） of kidney in mice with fulminant hepatic failure （FHF）. METHODS： FHF was induced by lipopolysaccharide （LPS） in D-galactosamine （GAIN） sensitized BALB/c mice. There were 20 mice in normal saline （NS）-treated group, 20 mice in LPS-treated group, 20 mice in GaIN- treated group, and 60 mice in GalN/LPS-treated group （FHF group）. Liver and kidney tissues were obtained at 2, 6, and 9 h after administration. The liver and kidney specimens were stained with hematoxylin-eosin for studying morphological changes under light microscope. The expression of IP3R I in kidney tissue was tested by immunohistochemistry, Western blot and reverse transcription （RT）-PCR. RESULTS： Kidney tissues were morphologically normal at all time points in all groups. IP3R I proteins were found localized in the plasma region of glomerular mesangial cells （GMC） and vascular smooth muscle cells （VSMC） in kidney by immunohistochemical staining. In kidney of mice with FHF at 6 h and 9 h IP3R I staining was upregulated. Results from Western blot demonstrated consistent and significant increment of IP3R I expression in mice with FHF at 6 h and 9 h （t = 3.16, P 〈 0.05; t = 5.43, P 〈 0.01）. Furthermore, we evaluated IP3R I mRNA expression by RT-PCR and observed marked upregulation of IP3R I mRNA in FHF samples at 2 h, 6 h and 9 h compared to controls （t = 2.97, P 〈 0.05; t = 4.42, P 〈 0.01; t = 3.81, P 〈 0.01）. CONCLUSION： The expression of IP3R I protein increased in GMC and renal VSMC of mice with FHF, possibly caused by up-regulation of IP3R I mRNA.

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。

Novel electrospun poly(ε-caprolactone)/type Ⅰ collagen nanofiber conduits for repair of peripheral nerve injury

Recent studies have shown the potential of artificially synthesized conduits in the repair of peripheral nerve injury. Natural biopolymers have received much attention because of their biocompatibility. To investigate the effects of novel electrospun absorbable poly(ε-caprolactone)/type Ⅰ collagen nanofiber conduits(biopolymer nanofiber conduits) on the repair of peripheral nerve injury, we bridged 10-mm-long sciatic nerve defects with electrospun absorbable biopolymer nanofiber conduits, poly(ε-caprolactone) or silicone conduits in Sprague-Dawley rats. Rat neurologica1 function was weekly evaluated using sciatic function index within8 weeks after repair. Eight weeks after repair, sciatic nerve myelin sheaths and axon morphology were observed by osmium tetroxide staining, hematoxylin-eosin staining, and transmission electron microscopy.S-100(Schwann cell marker) and CD4(inflammatory marker) immunoreactivities in sciatic nerve were detected by immunohistochemistry. In rats subjected to repair with electrospun absorbable biopolymer nanofiber conduits, no serious inflammatory reactions were observed in rat hind limbs, the morphology of myelin sheaths in the injured sciatic nerve was close to normal. CD4 immunoreactivity was obviously weaker in rats subjected to repair with electrospun absorbable biopolymer nanofiber conduits than in those subjected to repair with poly(ε-caprolactone) or silicone. Rats subjected to repair with electrospun absorbable biopolymer nanofiber conduits tended to have greater sciatic nerve function recovery than those receiving poly(ε-caprolactone) or silicone repair. These results suggest that electrospun absorbable poly(ε-caprolactone)/type Ⅰ collagen nanofiber conduits have the potential of repairing sciatic nerve defects and exhibit good biocompatibility. All experimental procedures were approved by Institutional Animal Care and Use Committee of Taichung Veteran General Hospital, Taiwan, China(La-1031218) on October 2, 2014.

Expression and role of specificity protein 1 and collagenⅠin recurrent pterygial tissues

AIM:To investigate the expression profiles of the transcription factor specificity protein 1(Sp1)and collagenⅠin recurrent pterygial tissues.What is more,to compare the changes of Sp1 and collagen I among primary pterygial tissue,recurrent pterygial tissue and conjunctival tissue.METHODS:In the prospective study,we collected the pterygial tissues of 40 patients who underwent resection of primary pterygial tissue and recurrent pterygial tissue,and the conjunctival tissues of 10 patients with enucleation due to trauma.The relative expression levels of Sp1 and collagen I were analyzed by reverse transcription quantitative-polymerase chain reaction and Western blot.Paired t-test was performed to compare the Sp1 and collagen I of recurrent pterygial tissues,as well as the primary pterygial tissues and conjunctival tissues.In further,Pearson’s hypothesis testing of correlation coefficients was used to compare the correlations of Sp1 and Collagen I.RESULTS:The content of Sp1 and collagen I m RNA and protein was significantly greater in recurrent pterygial tissue than that was in primary and conjunctival tissue(P<0.05).There was a positive correlation between the m RNA and protein levels of Sp1 and collagen I in recurrent pterygial tissues(protein:r=0.913,P<0.05;m RNA:r=0.945,P<0.05).CONCLUSION:Sp1 and collagen I are expressed in normal conjunctival,primary,and recurrent pterygial tissues,but expression is significantly greater in the latter.Sp1 and collagen I may be involved in the regulation of the development of recurrent pterygium.

IGF-1、β-CTX与胫骨平台骨折术后感染及骨痂X线评分的关系

目的分析血清胰岛素样生长因子-1(IGF-1)、β-Ⅰ型胶原羧基端肽(β-CTX)水平与胫骨平台骨折患者术后感染及骨痂X线评分的关系。方法回顾性分析2020年1月至2023年1月北京市仁和医院收治的90例胫骨平台骨折患者的临床资料,根据术后感染情况分为感染组(n=23例)和未感染组(n=67例)。对比两组的临床资料,应用二元Logistic回归模型分析胫骨平台骨折患者术后感染影响因素;采用Spearman相关系数分析IGF-1、β-CTX与术后3个月的骨痂X线评分的相关性,绘制受试者工作特征(ROC)曲线分析IGF-1和β-CTX对患者术后骨折愈合情况的预测价值。结果两组一般资料中性别、损伤机制、骨质疏松情况、合并糖尿病情况、手术时间、联合应用抗生素情况以及住院天数比较差异均无统计学意义(P>0.05);感染组中年龄≥60岁、开放性骨折损伤类型、有遗留死腔的比例均高于未感染组,血清IGF-1和β-CTX水平均低于未感染组,差异有统计学意义(P<0.05);骨痂X线分级Ⅰ~Ⅱ级患者的血清IGF-1和β-CTX水平低于骨痂X线分级Ⅲ~Ⅳ级患者,差异有统计学意义(P<0.05);年龄≥60岁(OR=3.840,95%CI:1.803~8.178)、开放行骨折损伤类型(OR=3.656,95%CI:1.705~7.834)、有遗留死腔(OR=3.407,95%CI:1.670~6.955)、<中位数水平的血清IGF-1(OR=2.578,95%CI:1.388~4.789)和β-CTX(OR=2.550,95%CI:1.262~5.153)的胫骨平台骨折患者术后感染风险更高(P<0.05);血清IGF-1和β-CTX水平与胫骨平台骨折患者术后骨痂X线评分均呈正相关(r=0.671、0.699,P<0.05);血清IGF-1、β-CTX水平及二者联合预测胫骨平台骨折患者术后骨折愈合情况的AUC分别为0.799、0.832、0.884,敏感度分别为0.727、0.727、0.909,特异性分别为0.785、0.798、0.772。结论胫骨平台骨折患者术后感染情况与年龄、损伤类型、遗留死腔、血清IGF-1和β-CTX水平有关,临床可通过检测IGF-1和β-CTX水平变化预测患者术后骨折愈合情况。

Significance of elevated serum concentration of type Ⅰ collagen metabolites and its correlation with serum interleukin 6 activities in multiple myeloma

In this study, serum concentrations of carboxyterminal propeptide of type Ⅰ collagen(PICP) and carboxyterminal cross-linked telopeptide of type Ⅰ collagen (ICTP), which represent the rates of synthesis and degradation of type Ⅰ collagen, were determined by radioimmunoassay in 56 patients with multiple myeloma (MM) and 22 healthy controls. It was discovered that serum concentrations of both PICP and ICTP were higher in MM than those in healthy controls (P<0. 01 ). With the disease progressing and the number of bone lesions increasing,serum concentration of ICTP elevated while serum concentration of PICP showed no significant change. Neither serum PICP nor ICTP concentration was related to M-component classes. Our results indicated that serum ICTP concentration was a good serological marker to reflect severity of bone lesions in MM and elevated serum PICP concentration might be due to compensatory increase in type Ⅰ collagen synthesis. Moreover, we also found that serum ICTP concentrations in MM correlated with serum interleukin-6 (IL-6) activities (r= 0. 610, P< 0. 01),which confirms the effectiveness of IL-6 as an osteoclast activating factor.

Protein Flexibility and Multiple Docking in Ligand Docking and Virtual Screening to the BRAF(TypeⅠ1/2)Inhibitors

BRAF has been recognized as a promising target for cancer therapy. A number of crystal structures have been published. Molecular docking is one of the most effective techniques in the field of computer-aided drug design（CADD）. Appropriate protein conformation and docking method are essential for the successful virtual screening experiments. One approach considering protein flexibility and multiple docking methods was proposed in this study. Six DFG-in/αC-helix-out crystal structures of BRAF, three docking programs（Glide, GOLD and Ligand Fit） and 12 scoring functions were applied for the best combination by judging from the results of pose prediction and retrospective virtual screening（VS）. The most accurate results（mean RMSD of about 0.6 A） of pose prediction were obtained with two complex structures（PDB： 3 C4 C and 3 SKC） using Glide SP. From the retrospective VS, the most active compounds were identified by using the complex structure of 3 SKC, indicated by a ROC/AUC score of 0.998 and an EF of 20.6 at 5% of the database screen with Glide-SP. On the whole, PDB 3 SKC could achieve a higher rate of correct reproduction, a better enrichment and more diverse compounds. A comparison of 3 SKC and the other X-ray crystal structures led to a rationale for the docking results. PDB 3 SKC could achieve a broad range of sulfonamide substitutions through an expanded hydrophobic pocket formed by a further shift of the αC-helix. Our study emphasized the necessity and significance of protein flexibility and scoring functions in both ligand docking and virtual screening.

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。

ACLP、COL11A1在胰腺癌组织中的表达及其与临床病理特征和预后的关系

目的研究胰腺癌中主动脉羧肽酶类样蛋白(ACLP)、Ⅺ型胶原α1(COL11A1)表达及临床预后价值。方法回顾性选择2019年1月—2021年1月陕西省肿瘤医院中西医科和陕西中医药大学附属医院肿瘤科手术治疗的胰腺癌患者88例为研究对象。采用实时荧光定量PCR和免疫组织化学检测癌组织及癌旁组织中ACLP、COL11A1 mRNA表达和蛋白水平;Pearson相关分析ACLP mRNA与COL11A1 mRNA的相关性;Kaplan-Meier法分析ACLP、COL11A1表达对胰腺癌患者生存预后的影响;Cox回归分析胰腺癌预后的影响因素。结果胰腺癌患者癌组织ACLP、COL11A1 mRNA的相对表达量高于癌旁组织(t/P=31.058/<0.001,27.642/<0.001);胰腺癌患者癌组织中ACLP、COL11A1阳性率分别为69.32%(61/88)、70.45%(62/88),高于癌旁组织的9.09%(8/88)、6.82%(6/88),差异有统计学意义(χ^(2)=66.963、75.155,P均<0.001);胰腺癌组织中ACLP mRNA与COL11A1 mRNA表达呈正相关(r=0.642,P<0.001);TNM分期ⅡB~Ⅲ期、有淋巴结转移的胰腺癌组织中ACLP、COL11A1蛋白阳性率高于TNM分期Ⅰ~ⅡA期、无淋巴结转移(ACLP:χ^(2)/P=19.704/<0.001、12.908/<0.001;COL11A1:χ^(2)/P=22.440/<0.001、14.569/<0.001)。ACLP阳性组3年总生存率为22.95%(14/61),低于阴性组44.44%(12/27),差异有统计学意义(Log rankχ^(2)=5.433,P=0.020);COL11A1阳性组3年总生存率为20.97%(13/62),低于阴性组50.00%(13/26),差异有统计学意义(Log rankχ^(2)=7.281,P=0.007)。TNM分期ⅡB~Ⅲ期、淋巴结转移、ACLP阳性、COL11A1阳性是影响胰腺癌患者预后的独立危险因素[HR(95%CI)=1.781(1.199~2.646),1.962(1.172~3.285),1.505(1.066~2.125),1.568(1.117~2.201)]。结论胰腺癌组织中ACLP、COL11A1 mRNA表达和蛋白水平均明显上调,二者在胰腺癌的发生和进展中发挥促进作用,是新的临床上评估胰腺癌患者预后的标志物。