bFGF对血管性痴呆大鼠海马神经干细胞的影响

目的皮下注射bFGF于血管性痴呆大鼠,研究用药前后对大鼠海马神经干细胞增殖能力的影响。方法制作VD大鼠模型,随机取用VD大鼠模型12只,分治疗组6只,痴呆组6只。另外,取假手术组6只。皮下注射bFGF于治疗组中血管性痴呆大鼠。治疗5周后,以Morris水迷宫定位航行试验和空间探索试验来检测大鼠的学习记忆能力,巢蛋白（nestin）免疫组织化学染色,观察海马nestin阳性细胞数的变化。结果治疗组大鼠海马nestin阳性细胞数较痴呆组明显增多。结论皮下注射bFGF后能迁移至海马,诱导海马产生nestin阳性细胞,刺激大鼠海马神经干细胞增殖,修复受损组织。     

小鼠血管损伤后巨噬细胞与平滑肌细胞的相互作用

目的研究血管损伤后病变形成过程中的巨噬细胞与平滑肌细胞的相互作用。方法C57BL/6（6～8周龄）小鼠24只,右侧股动脉植入透明塑料微导管,制作小鼠血管损伤模型,术后给予特异性抗体AFS98及APB5,分别阻断巨噬细胞和平滑肌细胞增殖的信息传导通路。给药2周后采集股动脉组织,用免疫组织化学的方法对血管病变进行分析。结果小鼠股动脉血管损伤2周后,病变部位聚集了大量的巨噬细胞、平滑肌细胞。给予阻断巨噬细胞增殖的信息传导通路的特异性抗体AFS98后,病变部位的巨噬细胞数量显著减少,平滑肌细胞数量反而增多。相反,给予抑制平滑肌细胞增殖的抗体APB5后,病变局部平滑肌细胞数量减少,而巨噬细胞数量急剧增加。结论小鼠股动脉血管损伤后,构成病变的细胞主要为巨噬细胞与平滑肌细胞。这两种细胞在分化成终末成熟细胞的过程中,存在着相互拮抗的作用。     

Dihydrotestosterone and estradiol-17β mutually neutralize their inhibitory effects on human vascular smooth muscle cell growth in vitro

We reported previously that high concentrations of either estradiol-17β (E₂) or dihydrotestosterone (DHT) inhibit growth of human cultured vascular smooth muscle cells (VSMC), mediated by cell membrane receptors and MAP-kinase–kinase activity (MEK). We now tested whether the presence of the opposite gender's dominant sex hormone modifies these effects. We incubated VSMC with various concentrations of E₂ and DHT or protein bound hormones (E₂–BSA or T–BSA), alone or in various combinations. High concentration of E₂ or E₂–BSA inhibited VSMC growth and stimulated MEK. In the presence of 3 nM DHT, high concentration of E₂ no longer inhibited ³[H] thymidine incorporation or increased MEK. Moreover, when high DHT concentration (300 nM) was added to VSMC exposed to high E₂, VSMC growth actually increased without change in MEK. DHT at 300 nM suppressed VSMC growth and increased MEK while 0.3 nM E₂ had only marginal effect on this interaction, and 30 nM E₂ reversed the inhibitory effect of DHT on cell growth. The inhibitory effects of both E₂ and DHT on VSMC cell growth and the stimulation of MEK was apparently mediated by cell membrane receptors, as it persisted when bovine serum albumin (BSA)-bound hormones were used. Further, inhibition of VSMC growth induced by E₂–BSA was reversed in the presence of T–BSA and vice versa. These results suggest that while female and male sex hormones affect VSMC growth similarly, they interfere in a dose-, hormone- and MEK-dependent manner with each other's effect.     

子宫腺肌病中异位和正位子宫内膜血管发生的研究

目的探讨子宫腺肌病中异位和正位内膜组织中血管内皮生长因子(VEGF)的表达及微血管密度(MVD)与发病机制的关系.方法采用免疫组织化学技术检测21例正常子宫内膜(对照组)和38例子宫腺肌病(疾病组)异位内膜及正位内膜中VEGF的表达,利用Ⅷ因子相关抗原标记血管内皮细胞,再应用计算机图像分析系统分析VEGF免疫染色密度值及计数切片中微血管(20×视野).结果疾病组异位内膜腺上皮细胞及间质细胞中VEGF的表达明显高于对照组腺上皮及间质细胞(P<0.01).疾病组正位内膜腺上皮细胞中的VEGF的表达亦高于对照组(P<0.05).疾病组异位内膜中的平均微血管密度明显高于正位内膜及对照组(P<0.05).VEGF与MVD表达呈明显正相关(P<0.01).结论子宫腺肌病异位和正位内膜中VEGF表达的明显增高及局部微血管密度的明显增加,可能导致局部新生毛细血管的增多,从而促进子宫内膜在子宫肌层内异位种植和生长.     

Diversity and Vertical Distribution Characteristics of Vascular Epiphytes in Bulong Nature Reserve Mengsong Section,Xishuangbanna

The first survey of vascular epiphytes was conducted using ground based inventory assisted by single rope technique in the recently established Bulong Nature Reserve, Xishuangbanna, China. Results indicated that vascular epiphytes were abundant and diverse there. On a total of 77 phorophytes in six plots (96 trees were examined in total, covered ca. 02ha area), 1756 individuals were recorded and were identified to 103 species (47 genera, 14 families). Compared with other regions, the epiphytes were as diverse as Paleotropics, and more diverse than temperate zone, but significantly less than the Neotropics. Orchids and ferns comprised 60%, 24% of the total flora, respectively, while others only took up 16%. The highest species richness and richest life form diversity was found in the middle canopy zone from 10 to 15m (51% of total species), where also supported high individual abundance (19% of total individuals). Besides the middle canopy, the most abundant zone of epiphyte individuals was detected at the base of the trunk (zone 0-5m, 24% of total individuals and 37% of total species), indicating another important niche for epiphytes in this forest environment. Primary hemiepiphytic figs were rare in the area and were not found on the surveyed host trees, while hemiepiphytic Araliaceae species (Schefflera elliptica and Tupidanthus calyptratus) were popular.     

Mechanoresponse of stem cells for vascular repair

Stem cells have shown great potential in vascular repair. Numerous evidence indicates that mechanical forces such as shear stress and cyclic strain can regulate the adhesion, proliferation, migration, and differentiation of stem cells via serious signaling pathways. The enrichment and differentiation of stem cells play an important role in the angiogenesis and maintenance of vascular homeostasis. In normal tissues, blood flow directly affects the microenvironment of vascular endothelial cells (ECs); in pathological status, the abnormal interactions between blood flow and vessels contribute to the injury of vessels. Next, the altered mechanical forces are transduced into cells by mechanosensors to trigger the reformation of vessels. This process occurs when signaling pathways related to EC differentiation are initiated. Hence, a deep understanding of the responses of stem cells to mechanical stresses and the underlying mechanisms involved in this process is essential for clinical translation. In this the review, we provide an overview of the role of stem cells in vascular repair, outline the performance of stem cells under the mechanical stress stimulation, and describe the related signaling pathways.     

血管超声与64排螺旋CT血管造影在评价颈动脉狭窄中的对比研究

目的:比较血管超声与64排螺旋CT血管造影(CTA)对颈动脉狭窄的诊断价值。方法:选取2014年12月到2015年12月我院收治的疑似颈动脉狭窄患者70例(278节段),所有患者入院1周内均行血管超声、64排螺旋CTA检查,以数字减影血管造影(DSA)为金标准,比较血管超声与64排螺旋CTA对颈动脉狭窄诊断的符合率、特异度和灵敏度。结果:血管超声和64排螺旋CTA对不同程度颈动脉狭窄诊断的符合率比较,差异均无统计学意义(P0.05);血管超声和64排螺旋CTA对颈动脉狭窄诊断的灵敏度和特异度分别为87.28%、85.71%和85.55%、90.48%,比较差异无统计学意义(P0.05)。结论:血管超声和64排螺旋CTA对颈动脉狭窄均具有较高的诊断价值。     

VEGF和IGF-I在子宫内膜异位症患者血清中的表达及临床意义

目的：探究血管内皮生长因子（VEGF）和胰岛素样生长因子-I（IGF-I）在子宫内膜异位症患者血清中的表达及临床意义,为 子宫内膜异位症的治疗提供参考。方法：选取我院2015 年1 月至2016 年1 月收治的子宫内膜异位症患者50 例为实验组,另选 体检中心健康妇女50 例为对照组。实验组患者根据疾病不同分期分为I、II期（n=24）和III、IV 期（n=26）。通过酶联免疫吸附法 （ELISA）检测两组对象血清中VEGF和IGF-I的水平,采用Pearson相关分析法分析实验组患者血清中VEGF 和IGF-I 表达的相 关性。结果：实验组患者血清中VEGF和IGF-I的水平均明显高于对照组,差异有统计学意义（P<0.05）;实验组III、IV期患者血清 中VEGF和IGF-I的水平明显高于I、II期患者,差异有统计学意义（P<0.05）;Pearson 相关性分析显示实验组患者血清中VEGF 和IGF-I的水平变化呈正相关关系（r=0.507,P<0.05）。结论：子宫内膜异位症患者血清中VEGF和IGF-I的水平高于正常水平,并 随着病情的加重而不断升高,且二者呈正相关关系,可协同作用加快病情发展。     

沙利度胺对原发性肝癌介入后血管内皮生长因子及生存质量的影响

目的:探讨沙利度胺对原发性肝癌(HCC)介入后血管内皮生长因子(VEGF)及生存质量的影响。方法:将2014年1月至2016年1月期间我院收治的拟行肝动脉栓塞化疗(TACE)的HCC患者60例按照随机数字表法分为A、B两组,各30例。A组患者采用TACE+沙利度胺治疗,每晚200 mg,口服一个月;B组患者单行TACE治疗。分别于治疗前、治疗后3周检测两组患者的VEGF水平,于治疗前、治疗后1个月应用生存质量评分量表(QOL)评价患者生存质量,并比较两组患者治疗前后的体重及治疗过程中的不良反应。结果:治疗前两组患者血清VEGF水平差异无统计学意义(P0.05)。治疗后两组患者VEGF水平均较治疗前升高,其中A组患者治疗后VEGF水平显著低于B组患者(P0.01)。治疗前两组患者QOL分数和体重比较差异无统计学意义(P0.05)。而治疗后两组患者的QOL分数较治疗前均有所降低,但A组患者的QOL分数显著高于B组患者(P0.05),而两组患者治疗后的体重无统计学差异(P0.05)。A组30例患者中有1例(3.33%)患者因严重嗜睡、2例(6.67%)患者因严重口腔干燥而终止口服沙利度胺,其余27例患者均能耐受。结论:沙利度胺联合TACE方法治疗HCC可降低VEGF水平和改善癌症患者的生存质量,值得在临床上推广使用。     

Genomics in space life sciences

Since the early days of manned spaceflight, hazardous effects of the space environment on living organisms have been disputed. With the continuous manning of the International Space Station, the planned Chinese space station, and renewed interest in returning to the Moon and sending manned flights to Mars, identifying and addressing the potential outcomes of long-term space exposures is critically important.