筋膜间隔综合征的高压氧治疗与血浆纤粘素变化的关系

本文首次报道采用253kPa的高压氧治疗24例创伤后筋膜间隔综合征(PACS)病人并采用免疫单扩散法检测了治疗前后血浆纤粘素(FN)的变化与预后的关系。30例健康人作为血浆FN的对照组。结果表明:16例早期PACS病人,经3～5次高压氧治疗,症状和体征逐渐好转,无1例作筋膜切开减压。6例筋膜切开减压后行高压氧治疗者,水肿、炎症消退,体温降低,临床症状好转。2例坏死期PACS虽然临床症状好转,但效果差。高压氧治疗后,病人血浆FN显著高于治疗前。分别较治疗前高43(18.9％;P<0.01)、61(24.7％;P<0.01)、49(17.2％;P<0.01)、57(17.4％;P<0.05)和55mg/L(16.6％;P<0.05)。根据本组研究的结果,提示高压氧是治疗早期PACS的有效非手术疗法和筋膜减压后有效辅助疗法。     

显露血管内皮下层纤维连接素的方法

本文报道了一种显露内皮下层纤维连接素的理想方法。大白鼠主动脉壁分别用1.0％NP-40作用5min,30.0mmol/L KCl作用10min后,内皮细胞全部脱离,内皮下层大部分纤维连接素被保留。本法适用于建立细胞与血管壁相互作用的体外实验模型。     

Fibronectin inhibits endocytosis of calcium oxalate crystals by renal tubular cells

BACKGROUND: Fibronectin (FN; 230 kDa) is a multifunctional alpha2-glycoprotein distributed throughout the extracellular matrix and body fluids. We recently reported that FN has a protective effect against injury of renal tubular cells by exposure to oxalate and calcium oxalate (CaOX) crystals and inhibits the adhesion of CaOX crystals to renal tubular cells. In the study presented here, we investigated whether FN has inhibitory effect on crystal endocytosis by renal tubular cells. METHODS: The inhibitory effect of FN on endocytosis of CaOX crystals by MDCK cells was examined by using a radioactivity uptake assay. Also, crystal endocytosis by cells was morphologically assessed by means of transmission electron microscopy (TEM). RESULTS: FN had inhibitory effects on CaOX crystal endocytosis by MDCK cells. The morphological TEM study showed that few crystals were taken into cells when FN was added compared to the number of crystals when FN was not added. CONCLUSION: We found that FN had the inhibitory effects on the interaction between crystals and renal tubular cells, including the adhesion or endocytosis of crystals by cells.     

血管紧张素对增生性瘢痕成纤维细胞纤维连接蛋白合成的影响

目的：探讨血管紧张素Ⅱ（AngⅡ）及其Ⅰ型、Ⅱ型受体阻断剂和钙调神经磷酸激酶（CaN）的阻滞利环胞素A（CsA）对增生性瘢痕来源的成纤维细胞纤维连接蛋白mRNA和蛋白表达的作用。方法：体外分离培养增生性瘢痕成纤维细胞，分别将一定浓度的AngⅡ（10^-9～10^-5mmol／L），和AngⅡ10^-6mmol／L加上不同阻滞剂losartan、PD123319、环胞素A（浓度均为10^-5mmol／L）加入细胞培养液中刺激48h，分别采用逆转录聚合酶链反应（RT—PCR）及Westernblot印迹方法检测增生性瘢痕成纤维细胞纤维连接蛋白（FN）的mRNA及蛋白表达。结果：体外成功地培养增生性瘢痕成纤维细胞。经AngⅡ刺激48h后，FN mRNA和蛋白表达量明显增高，增高程度与AngⅡ浓度呈正比；加入losaartan和环胞素A后，FN原mRNA和蛋白表达量较单用AngⅡ组下降，而加入PD123319后，FNmRNA和蛋白表达量较单用AngⅡ组无明显改变。结论：AngⅡ可促增生性瘢痕成纤维细胞的FN合成，可能在增生性瘢痕的发展过程中起重要作用，该作用主要通过AngⅡ的Ⅰ型受体介导完成，该作用可能与CaN信号通路有关。     

血浆纤维连接蛋白含量对肺性脑病预后判断的临床价值

采用火箭电泳法对６４例（８０例次）肺性病患者进行血浆纤维连接蛋白（Ｆｎ）测定。合并肺性脑病１９例，并与１０６例健康人及１０４例其他呼吸疾患进行对比．结果表明：正常组、肺性病缓解组、急性发作组、肺性脑病组血浆Ｆｎ水平分别为３４．２７±６．３６ｍｇ／ｄｌ，２９．６１±４．２５ｍｓ／ｄｌ，１５．２１±５．２０ｍｇ／ｄｌ，１１．８２±５．６７ｍｇ／ｄｌ．肺性脑病患者血浆Ｆｎ显著降低，并随病情恶化而进一步下降。同时，其含量变化与ｐＨ值和ＰａＯ２呈正相关，与ＰａＣＯ２，呈负相关。因此动态观察肺性脑病患者血浆Ｆｎ含量可作为判断顶后一项较为可靠的指标。     

In-vivo studies on Haemaccel-fibronectin interaction in man

An enzyme-linked immunoassay has been recently set up for direct measurement of the binding capacity of plasma fibronectin to gelatin. This binding capacity could be completely inhibited in vitro by an eight-fold excess of gelatin, of Haemaccel, but not of Geloplasma. On the contrary, the levels of immunoreactive fibronectin measured by laser nephelometry did not change, in presence of 10 to 1000 micrograms ml-1 of gelatin, of Haemaccel or of Geloplasma. When infused into normal volunteers, Haemaccel provoked a strong and immediate inhibition of the plasma fibronectin binding capacity to gelatin. This inhibition was dose-dependent and maximal after infusion of 500 ml of Haemaccel. Twenty-four hours after this infusion, there was a progressive recovery of the gelatin-binding capacity, which was almost completely achieved 96 h later. The formation of complexes between Haemaccel and fibronectin was demonstrated by gel filtration chromatography and by affinity chromatography. Immunoreactive plasma fibronectin levels remained unchanged up to 24 h after infusion of 500 ml of Haemaccel. A transient decline to 50% of its initial value then occurred the second day after the infusion. Therefore, a delay existed between the formation of fibronectin-Haemaccel complexes and their elimination from the bloodstream. This delay decreased when smaller volumes of Haemaccel were infused, which strongly suggests that plasma fibronectin is cleared by means of Haemaccel and does not seem to play a role of opsonin in these conditions.(ABSTRACT TRUNCATED AT 250 WORDS)     

纤维连接蛋白对生物矿化影响的体外实验研究

目的:探讨纤维连接蛋白(Fn)对生物矿化过程的影响,为其应用于临床作盖髓剂提供理论依据.方法:应用体外凝胶矿化系统结合微观形态学观察,研究有无羟基磷灰石(HAP)晶核时Fn对钙磷沉积的影响.结果:凝胶体系中随Fn浓度升高,吸光度值也升高(P<0.01),表明磷酸钙沉淀量的增多;加入HAP并不降低Fn的促沉积活性.结论:Fn可能通过促进钙磷沉积及其与HAP的相互作用参与矿化过程,此特性可能有利于Fn作为盖髓剂成份诱导牙本质桥形成.     

纤维结合素在实验性肝纤维化中动态变化研究

本实验研究了血浆纤维结合素和肝组织中纤维结合素的动态变化规律。结果显示F_n在肝中的沉积与肝纤维化的严重程度有关。在肝纤维化早期血浆F_n增高,当胶元在肝中沉积达最高峰时,血浆F_n反而下降低于正常。这提示F_n可能参予胶元在肝中的沉积并对肝纤维化的早期诊断有一定意义。     

A study on content and distribution of plasma and tissue fibronectin in rats using ELISA and immunofluorescence

Summary The content of plasma fibronectin and tissue extractable fibronectin in normal rats was measured with rocket immunoelectrophoresis and ELISA in the present study. The difference in tissue fibronectin distribution in various organs and the correlation between distribution and content of fibronectin have been studied. We suggest that tissue fibronectin may be a complex component. The change in plasma fibronectin reflects a dynamic balance existing between the tissue fibronectin pool and plasma fibronectin pool in normal rats. Plasma fibronectin and tissue fibronectin concentrations are not static, and they can only be maintained in a relatively stable state in normal rats.