共查询到20条相似文献,搜索用时 15 毫秒
1.
目的对正常成人脑组织进行扩散峰度成像(DKI)的可重复性研究。材料与方法选取年龄在31~66岁的正常成人志愿者26例,采用b值为0、500、1000、1500、2000 s/mm2多参数和多方向的DKI序列进行头部扫描,经2名观察者(放射科医师)分别独立在不同的时间,测量相同区域的扩散系数(MD)和扩散峰度系数(MK)值并记录。运用SPSS 19.0进行统计学分析评估DKI扩散系数(MD)和扩散峰度系数(MK)值观察者内、观察者间一致性。结果经2名观察者在不同的时间点测量得到胼胝体膝部、胼胝体压部、内囊前肢、内囊后肢及丘脑等部位的MD和MK值。同一观察者两次所测得值(观察者内)之间差异无统计学意义(P0.05);2名观察者分别所测得值(观察者间)之间差异无统计学意义(P0.05)。结论脑组织扩散峰度成像(DKI)具有良好的可重复性,可应用于反映脑组织微观结构变化特点。 相似文献
2.
碱性成纤维细胞生长因子在人体脂肪移植中的应用 总被引:2,自引:1,他引:2
目的:碱性成纤维细胞生长因子可促进再血管化过程,有利于脂肪细胞的成活。观察碱性成纤维细胞生长因子在自体脂肪移植治疗面部凹陷畸形中的作用效果。方法:选择2001-11/2006-03于南昌大学第二附属医院整形美容科采用自体脂肪移植治疗面部凹陷畸形的患者60例,共73个部位,所有患者均排除器质性病变且知情同意。按随机数字表法分为2组,每组30例。取出的脂肪经过清洗、过滤备用。①碱性成纤维细胞生长因子组在要移植的脂肪中加入10μg/L的碱性成纤维细胞生长因子和庆大霉素液,每100mL脂肪颗粒中加入庆大霉素8万单位及碱性成纤维细胞生长因子2万单位。②对照组只加入庆大霉素液不加碱性成纤维细胞生长因子。术后半年随访,观察一次注射后的治疗效果。评估标准:凹陷充填后丰满平坦,双侧对称满意者为优;凹陷充填后较丰满平坦,双侧基本对称较满意者为良。结果:①术后半年随访,本组60例患者均使凹陷部位得到不同改善,无一例发生感染、液化及干酪样坏死等并发症。②术后半年碱性成纤维细胞生长因子组优良率为87%,对照组优良率为57%,两组相比差异具有显著性意义(P<0.05)。结论:碱性成纤维细胞生长因子可以促进人体移植脂肪的存活,改善面部凹陷畸形脂肪移植的术后效果。 相似文献
3.
目的 观察血液透析过程对维持性血液透析 (maintenancehemodialysis,MHD)患者血浆中组织因子 (tissuefactor,TF)及其调节物 -组织因子途径抑制物 (tissuefactorpathwayinhibitor,TFPI)活性的影响。方法 应用发色底物法检测了 4 3名慢性肾衰竭患者的血浆组织因子、组织因子途径抑制物活性 ,其中 2 0例为未进行血液透析的终末期肾病 (end -stagerenaldisease ,ESRD)患者 (肾衰竭组 ) ,2 3例为慢性MHD患者在一次透析开始前 (透析前组 )和透析结束时 (透析后组 )的血浆TF、TFPI活性指标。同时观察透析过程中肝素对血浆TF、TFPI活性的影响。并对 2 3名健康自愿者 (正常对照组 )进行了血浆TF、TFPI活性的测定。结果 ①TF活性在肾衰竭组和透析前组均较正常对照组明显升高 ,分别为 [(1.1790± 0 .2 937)nmvs (0 .30 5 5±0 .190 1)nm ;(0 .884 8± 0 .5 4 6 1)nmvs (0 .30 5 5± 0 .190 1)nm ,(P均 <0 .0 1) ];肾衰竭组高于透析前组 ,但差异无显著性 (P >0 .0 5 ) ;②TFPI活性在透析前组和肾衰竭组均较对照组轻度升高 ,且肾衰竭组TFPI活性低于透析前组 ,但P均 >0 .0 5 ,无统计学意义 ;③一次透析过程中 ,透析后组TFPI活性明显高于透析前组[(2 .110 5± 1.36 37)u/mlvs (1.3347± 0 .84 19)u/ml,(P <0 .0 5 ) 相似文献
4.
目的:采用经颅电刺激模式研究影响运动诱发电位的相关因素,从而筛选合理的电刺激信号模式。方法:利用家猫进行波宽50μs的方波经颅电刺激,刺激电压为100,200或500V,刺激信号单个刺激或连续刺激,其中连续刺激为333,200Hz连续3个刺激、连续5个刺激等多种信号模式,同时进行双侧股内侧肌皮电极与针电极肌电图的记录与测量,并进行统计分析。结果:刺激不影响猫的生存,连续刺激后可见到猫头部活动,单个刺激100V时均可记录在低幅的肌电图,波幅在10.1~11.6μV,低于80V后无法记录到肌电活动,在高幅电压及重复刺激时可以见到典型的三相肌电活动诱发电位,而在低电压单个刺激时见到的是单相或双相低幅的钝波。肌电电位随刺激电压、重复次数的增加而增高,特别是连续5个刺激时随电压的增高呈直线相关性,200Hz时电位高于333Hz,记录用针电极或皮电极对肌电图影响不明显,两侧肢体记录到的肌电图亦无明显差异。结论:经颅电刺激是一种方便、安全的运动诱发电位刺激模式,200Hz,500V、连续5个刺激的50μV方波是比较理想的经颅电刺激信号。 相似文献
5.
The effects of brain tissue decomposition on diffusion tensor imaging and tractography 总被引:1,自引:0,他引:1
There have been numerous high resolution diffusion tensor imaging studies in fixed animal brains, but relatively few studies in human brains. While animal tissues are generally fixed pre-mortem or directly postmortem, this is not possible for human tissue, therefore there is always some delay between death and tissue fixation. The elapsed time between death and tissue fixation, the postmortem interval (PMI), will most likely adversely affect the tissue's diffusion properties. We studied the effects of PMI on the diffusion properties of rodent brain. Eight mice were euthanized and the brains (kept in the skull) were placed in formalin at PMIs of 0, 1, 4 and 14 days. Post fixation they were placed in a solution of GdDTPA and phosphate buffered saline. Brains were scanned with a 3D EPI DTI sequence at 4.7T. DTI data were processed to generate apparent diffusion coefficient (ADC) and fractional anisotropy (FA) maps. DTI tractography was also performed. The temporal changes in regional ADC and FA values were analyzed statistically using a one-way ANOVA, followed by individual Student's T-tests. Regional FA and ADC of gray and white matter decreased significantly with time (p<0.05). DTI tractography showed a decrease in the number and coherence of reconstructed fiber pathways between PMIs 0 and 14. Elapsed time between death and tissue fixation has a major effect upon the brain's diffusion properties and should be born in mind when interpreting fixed brain DTI. 相似文献
6.
碱性成纤维细胞生长因子对成骨细胞与多孔生物材料黏附特性的影响 总被引:3,自引:1,他引:2
目的研究碱性成纤维细胞生长因子(BasicFibroblastGrowthFactor,bFGF)对成骨细胞与多孔生物材料粘附特性的影响.方法分别用0.1、1、10、100、1000ng/ml系列浓度的bFGF诱导培养基诱导培养成骨细胞24h后,接种成骨细胞于多孔生物材料上,测定接种后1h的粘附细胞率.结果bFGF在0~10ng/ml范围内能促进细胞在材料上的粘附,并在10ng/ml浓度下达到最大粘附率(P<0.05),当bFGF浓度进一步增加时,细胞粘附率不再增加,在1000ng/ml时细胞粘附率与对照组无明显差异.结论10ng/ml的bFGF诱导可明显促进成骨细胞与多孔生物材料间的粘附. 相似文献
7.
Residual sodium dodecyl sulfate in decellularized muscle matrices leads to fibroblast activation in vitro and foreign body response in vivo 下载免费PDF全文
Emily E. Friedrich Steven T. Lanier Solmaz Niknam‐Bienia Gabriel A. Arenas Divya Rajendran Jason A. Wertheim Robert D. Galiano 《Journal of tissue engineering and regenerative medicine》2018,12(3):e1704-e1715
Detergents such as sodium dodecyl sulfate (SDS) are commonly used to extract cells from tissues in a process called “decellularization”. Residual SDS is difficult to completely remove and may lead to an undesirable host response towards an implanted biomaterial. In this study, we developed a modification for SDS cell extraction from muscle equally efficient to previous methods but leading to significantly less residual SDS remnants in the matrices. Muscle‐derived matrices were prepared via 2 SDS‐based decellularization methods, which led to removal of either 81.4% or 98.4% of the SDS. In vitro, matrices were seeded with thp1 macrophages and primary human foreskin fibroblasts. By Day 2, both matrices demonstrated similar macrophage polarization; however, fibroblasts cultured on matrices with greater residual SDS expressed higher levels of mRNA associated with fibroblast activation: α‐smooth muscle actin and connective tissue growth factor. In vivo, Collagen I gels spiked with increasing concentrations of SDS displayed a corresponding decrease in cell infiltration when implanted subcutaneously in rats after 4 days. Finally, as a model for muscle regeneration, matrices produced by each method were implanted in rat latissimus dorsi defects. At POD 30 greater levels of IL‐1β mRNA were present in defects treated with matrices containing higher levels of SDS, indicating a more severe inflammatory response. Although matrices containing higher levels of residual SDS became encapsulated by POD 30 and showed evidence of a foreign body response, matrices with the lower levels of SDS integrated into the defect area with lower levels of inflammatory and fibrosis‐related gene expression. 相似文献
8.
目的通过将碱性成纤维细胞生长因子(basic
fibroblast growth factor,bFGF)与胶原基组织工程支架进行复合,实现对bFGF的控制释放,从而更有效的实现组织再生功能.方法采用ELISA酶联免疫试剂盒对溶出的bFGF进行定量分析,考察支架对bFGF的短期控制释放过程.结果bFGF可以通过静电作用与胶原基支架结合,均匀分布在多孔三维支架中,48
h后,bFGF的溶出浓度趋于恒定,经过甲醛交联的支架对bFGF的结合量较高;bFGF的结合量受到壳聚糖的含量和交联方法的影响.结论胶原基组织工程支架能够对生长因子在较长时间内实现控制释放,促进组织的再生修复. 相似文献
9.
The influence of brain tissue anisotropy on human EEG and MEG. 总被引:4,自引:0,他引:4
J Haueisen D S Tuch C Ramon P H Schimpf V J Wedeen J S George J W Belliveau 《NeuroImage》2002,15(1):159-166
The influence of gray and white matter tissue anisotropy on the human electroencephalogram (EEG) and magnetoencephalogram (MEG) was examined with a high resolution finite element model of the head of an adult male subject. The conductivity tensor data for gray and white matter were estimated from magnetic resonance diffusion tensor imaging. Simulations were carried out with single dipoles or small extended sources in the cortical gray matter. The inclusion of anisotropic volume conduction in the brain was found to have a minor influence on the topology of EEG and MEG (and hence source localization). We found a major influence on the amplitude of EEG and MEG (and hence source strength estimation) due to the change in conductivity and the inclusion of anisotropy. We expect that inclusion of tissue anisotropy information will improve source estimation procedures. 相似文献
10.
背景:有研究表明改构型酸性成纤维细胞生长因子是多功能生长因子,但其抗衰老作用至今尚未有报道。目的:观察改构型酸性成纤维细胞生长因子对D-半乳糖致衰老大鼠脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力的影响。方法:将Wistar大鼠采用皮下注射D-半乳糖建立衰老模型,建模成功后随机分为模型组、生理盐水对照组和改构型酸性成纤维细胞生长因子组,另设正常对照组。改构型酸性成纤维细胞生长因子组按12μg/kg剂量肌肉注射改构型酸性成纤维细胞生长因子,生理盐水对照组肌肉注射等量的生理盐水,模型组不干预。结果与结论:与正常对照组相比,模型组大鼠脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力均明显著降低(P〈0.01)。改构型酸性成纤维细胞生长因子组脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力均明显高于模型组和生理盐水对照组(P〈0.05)。结果提示,改构型酸性成纤维细胞生长因子能提高衰老大鼠脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力,具有延缓衰老作用。 相似文献
11.
背景:有研究表明改构型酸性成纤维细胞生长因子是多功能生长因子,但其抗衰老作用至今尚未有报道.目的:观察改构型酸性成纤维细胞生长因子对D-半乳糖致衰老大鼠脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力的影响.方法:将Wistar大鼠采用皮下注射D-半乳糖建立衰老模型,建模成功后随机分为模型组、生理盐水对照组和改构型酸性成纤维细胞生长因子组,另设正常对照组.改构型酸性成纤维细胞生长因子组按12 μg/kg剂量肌肉注射改构型酸性成纤维细胞生长因子,生理盐水对照组肌肉注射等量的生理盐水,模型组不干预.结果与结论:与正常对照组相比,模型组大鼠脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力均明显著降低(P < 0.01).改构型酸性成纤维细胞生长因子组脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力均明显高于模型组和生理盐水对照组(P < 0.05).结果提示,改构型酸性成纤维细胞生长因子能提高衰老大鼠脑组织、肝组织及红细胞膜Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力,具有延缓衰老作用. 相似文献
12.
目的观察老龄小鼠寰枢椎肌肉、韧带、筋膜损伤对其脑衰老进程的影响。方法利用手术损伤小鼠寰枢椎周围软组织。利用跳台试验检测小鼠学习、记忆能力;组织切片HE染色观察脑海马神经元数量;免疫组织化学染色观察β-淀粉样多肽(Aβ)、caspase-3的表达;试剂盒检测血清NO及脑组织SOD、MDA的变化。结果与对照组相比,跳台试验:模型组小鼠反应期明显延长,潜伏期明显缩短,错误次数显著增加(P〈0.01);HE染色可见模型组脑海马神经元数量明显减少,大脑皮层嗜神经现象明显;免疫组化:模型组脑海马区Aβ、caspase-3阳性细胞数均明显增加;生化指标检测结果:模型组小鼠脑组织MDA含量显著增加(P〈0.05),SOD活性明显下降(P〈0.01);其血清NO含量也显著增加(P〈0.05)。结论寰枢椎软组织损伤促进老龄小鼠脑细胞凋亡,导致其学习、记忆功能明显减退,加速了脑衰老的进程。 相似文献
13.
随着医学模式的改变,护理模式也随之发生变革,以病人为中心的整体护理取代了传统的功能制护理,健康教育已贯穿到从病人人院到出院的各个环节,成为检验整体护理效果、评价整体护理质量的重要指标,健康教育不仅使患者对自己的病情有不同程度的了解,促进病人身心健康和转归,而且使患 相似文献
14.
In diffusion tensor magnetic resonance imaging (DT-MRI), limitations concerning complex fiber architecture (when an image voxel contains fiber populations with more than one dominant orientation) are well-known. Fractional anisotropy (FA) values are lower in such areas because of a lower directionality of diffusion on the voxel-scale, which makes the interpretation of FA less straightforward. Moreover, the interpretation of the axial and radial diffusivities is far from trivial when there is more than one dominant fiber orientation within a voxel. In this work, using (i) theoretical considerations, (ii) simulations, and (iii) experimental data, it is demonstrated that the mean diffusivity (or the trace of the diffusion tensor) is lower in complex white matter configurations, compared with tissue where there is a single dominant fiber orientation within the voxel. We show that the magnitude of this reduction depends on various factors, including configurational and microstructural properties (e.g., the relative contributions of different fiber populations) and acquisition settings (e.g., the b-value). These results increase our understanding of the quantitative metrics obtained from DT-MRI and, in particular, the effect of the microstructural architecture on the mean diffusivity. More importantly, they reinforce the growing awareness that differences in DT-MRI metrics need to be interpreted cautiously. 相似文献
15.
Diffusion tensor imaging (DTI) permits non-invasive probing of tissue microstructure and provides invaluable information in brain diagnostics. Our aim was to examine approaches capable of capturing more detailed information on the propagation mechanisms and underlying tissue microstructure in comparison to the conventional methods. In this work, we report a detailed in vivo diffusion study of the human brain in an extended range of the b-factors (up to 7000 s mm(-2)) performed on a group of 14 healthy volunteers at 3T. Combined diffusion kurtosis imaging (DKI) and biexponential diffusion tensor analysis (BEDTA) were applied to quantify the attenuation curves. New quantitative indices are suggested as map parameters and are shown to improve the underlying structure contrast in comparison to conventional DTI. In particular, fractional anisotropy maps related to the slow diffusion tensor are shown to attain significantly higher values and to substantially improve white matter mapping. This is demonstrated for the specified regions of the frontal and occipital lobes and for the anterior cingulate. The findings of this work are substantiated by the statistical analysis of the whole slice histograms averaged over 14 subjects. Colour-coded directional maps related to the fast and slow diffusion tensors in human brain tissue are constructed for the first time and these demonstrate a high degree of axial co-alignment of the two tensors in the white matter regions. It is concluded that a combined DKI and BEDTA offers a promising framework for monitoring tissue alteration during development and degeneration or as a consequence of the neurological disease. 相似文献
16.
目的;探讨热休克反应对百日咳菌液致大鼠感染性脑水肿的影响及意义。方法:将SD大鼠分为3组:(1)正常对照组(NS);(2)感染性脑水肿组(PB);(3)热休克处理组(HS+PB);每组又分为8.24,h 两个时间点,取左大脑半球全层脑组织分别测定脑组织含水量,干脑组织Na^ ,K^ 含量,同侧大脑皮层和海马组织做电镜检查。结果:PB各组脑组织含水量明显高于NS组(P<0.01),HS+PB各组脑组织含水量明显低于PB组(P<0.01),同时HS+PB组脑组织含水量与NS组比较在统计学上无显著性意义(P>05),NS各组干脑组织Na^ ,K^ 含量变化不大(P>0.05),PB各组Na^ 含量明显高于NS组,K+含量明显低于NS组,在统计学上有显著性意义(P<0.01),HS+PB各组Na 含量明显低于PB组(P<0.01或P<0.05),K+含量除24h之外均明显高于PB组(P<0.01),各组Na^ 含量与脑含水量的变化呈正相关(P<0.01或P<0.05),K^ 含量与含水量的变化呈负相关,K+含量与Na^ 含量的变化呈负相关(P<0.01或P<0.05),电镜发现8h PB组神经细胞出现亮,暗两类细胞相间排列,细胞间胶质细胞足突水肿透亮;8h HS PB组胶质细胞中度水肿,细胞内线粒体基质电子密度增大,并可见大量微丝。24h PB组见亮,暗两类细胞,亮细胞水肿,而暗细胞体系变小,碎裂成凋亡小体,胶质细胞崩解成裸核,24h HS PB组仅见神经细胞呈椭圆或梭形的明细胞和暗细胞,细胞间胶质细胞足突水肿透亮,细胞间隙增宽。结论:以上结果提示热休克处理组可降低大鼠感染性脑水肿的脑组织含水量及钠离子含量,在形态学上表现为能减轻脑组织细胞水肿病变,对大鼠感染性脑水肿具有保护作用。 相似文献
17.
学术背景:碱性成纤维细胞生长因子广泛存在于人体各种组织中,在体内参与多种组织的创伤修复过程,是体内重要的创伤愈合因子之一。目的:总结碱性成纤维细胞生长因子在骨折愈合过程中作用的研究进展。检索策略:应用计算机检索Pubmed数据库2000—01/2007—12期间碱性成纤维细胞生长因子在骨折愈合过程中作用相关的文章,检索词为“fibroblast growth factor 2(basic fibroblast growth factor),fracture healing:regulation,signal transduction”,并限定文章语言种类为“English”。同时计算机检索中国期刊全文数据库、万方数据库2000-01/2007-12期间的相关文章,检索词为”碱性成纤维细胞生长因子,骨折愈合,调控,信号传导”。排除标准:重复性研究和缺乏原创性的研究。文献评价:经过筛选共收集到33篇文献。有关碱性成纤维细胞生长因子的分布3篇、生物学特性3篇和加速骨折愈合作用27篇文章。资料综合:骨愈合实质是骨损伤后的再生过程,也是骨组织的形成过程。碱性成纤维细胞生长因子可通过其趋化作用促进细胞迁移,使间充质细胞、巨噬细胞、成纤维细胞等向创伤部位聚集,从而启动创伤愈合过程。目前关于碱性成纤维细胞生长因子的动物实验研究已比较深入,临床应用也有报道,其在骨折愈合中的作用也逐渐的明朗,碱性成纤维细胞生长因子通过调节细胞增殖、分化并改变细胞产物的合成而作用于成骨过程,不仅能促进骨细胞的生长,且能促进成骨细胞与支架材料的黏附。结论:①碱性成纤维细胞生长因子的分布、生物学特性已被初步认识,其加速骨折的愈合的研究也进一步的深入。②碱性成纤维细胞生长因子及相关载体复合而成的骨修复材料已进入实验阶段,并有待进一步的研究。 相似文献
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目的:研究连续性血液净化(CBP)治疗对热射病患者组织因子的影响。方法:以34例热射病导致的多器官功能不全综合征(MODS)患者作为研究对象,所有患者行持续静脉血液滤过(CVVH)48h;以健康成人为对照。在治疗前以及CBP治疗各时间点,以ELISA法测定患者血清组织因子(TF)、可溶性血栓调节蛋白(sTM)、可溶性E选择素(sE-selectin)的水平,以流式细胞术测定单核细胞膜表面TF活性。用Pearson积差相关系数,研究血清TF与单核细胞膜表面TF活性、血清sTM以及sE-selectin的相关性。结果:与正常对照组比较,热射病患者血清TF、sTM和sE-selectin水平以及单核细胞膜表面TF活性明显增高(P〈0.01)。与治疗前比较,CBP治疗导致血清TF、sTM和sE-selectin水平、单核细胞膜表面TF活性明显下降(P〈0.05)。血清TF与单核细胞膜表面TF活性、血清sTM以及sE-selectin有显著相关性(P〈0.05)。结论:CBP可以通过抑制单核细胞和内皮细胞产生TF以及直接清除血清TF,达到降低血清中过度产生的TF作用。 相似文献
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碱性成纤维细胞生长因子复合降解膜对自体神经移植的影响 总被引:1,自引:0,他引:1
目的:用碱性成纤维细胞生长因子复合降解膜包裹自体神经移植部位观察其对神经再生的影响。
方法:实验于2002-05/2003-08在沈阳医学院奉天医院手外科研究所完成。取健康成年新西兰大耳白兔30只,将兔左、右肢正中神经切除3cm,并用左、右肢切下来的神经互换移植。其中,左肢神经移植处包裹碱性成纤维细胞生长因子复降解膜为实验侧,30例;右肢神经移植处包裹不含碱性成纤维细胞生长因子复合剂的降解膜为对照侧,30例。术后3,12,24周切取神经移植部,制成光、电镜标本和血-神经屏障HRP示踪标本,镜下观察组织学变化,显微图像分析测定有髓神经再生情况。
结果:实验大白兔30只均进入结果分析。①实验侧的再生有髓神经纤维在数量和直径上较对照侧差异有显著性[数量:实验侧近端为(648&;#177;144)条,远端为(504&;#177;82)条;对照侧近端为(614&;#177;178)条,远端为(224&;#177;59)条,P〈0.001。直径:实验侧近端为(4.5033&;#177;0.5461)μm,远端为(3.8000&;#177;0.7329)μm,对照侧近端为(4.4783&;#177;1.2689)μm。远端为(2.5416&;#177;0.7214)μm。P〈0.01]。②实验侧神经缝合段组织增生明显较对照侧的少,粘连程度明显较对照侧的轻(实验侧:无粘连0,轻度粘连85.7%,中度粘连14.3%,重度粘连0;对照侧:无粘连0,轻度粘连14.3,中度粘连14.3%,重度粘连71.4%)。③实验侧肌电反应强度明显优于对照侧[潜伏期:实验侧(4.94&;#177;0.897)ms,对照侧(7.30&;#177;1.620)ms,P〈0.01]。④实验侧神经移植段的血-神经屏障功能较对照侧恢复快。
结论:包裹成纤维细胞生长因子复合降解膜有减轻移植神经局部结缔组织增生、加速血-神经屏障功能恢复和促进神经再生的作用。增强神经自身再生能力结合抑制结缔组织增生可能是提高神经再生效果的新思路。 相似文献
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外源性碱性成纤维细胞生长因子对肠缺血再灌注大鼠肝脏内源性碱性成纤维细胞生长因子及其受体表达的影响 总被引:1,自引:1,他引:1
目的:通过观察外源性碱性成纤维细胞生长因子(bFGF)对缺血 再灌注大鼠肝脏内源性bFGF及碱性成纤维细胞生长因子受体(FGFR1)表达水平的影响,探讨bFGF调控内脏损伤修复的分子机制。方法:采用大鼠肠系膜上动脉夹闭模型,将动物随机分为假手术组、缺血即刻组、外源性bFGF治疗组及未治疗的再灌注6、24 和48小时组。bFGF和FGFR1 的表达水平采用免疫组织化学SP方法测定。结果:缺血 再灌注损伤后内源性bFGF和FGFR1 表达水平均明显提高,分别在再灌注6小时和24 小时达峰值,48小时后下降。应用外源性bFGF治疗后,在组织学损伤得到明显改善的同时,bFGF表达水平也较非治疗组明显提高,而FGFR1 的表达水平无变化。结论:缺血 再灌注损伤诱导了内源性bFGF和FGFR1 的表达,而外源性bFGF可能通过上调内源性bFGF的表达或其自身与FGFR1 结合,调控肝损伤后的组织修复。 相似文献