IGF-Ⅱ和IGF-ⅠR及IGFBP-3在结直肠癌组织中的表达及其临床意义

目的 :检测IGF-Ⅱ、IGF-ⅠR、IGFBP-3在结直肠癌中的表达,探讨其表达在结直肠癌的早期诊断中的价值。方法:应用免疫组织化学SP法分别检测结直肠癌、结直肠腺瘤、炎性息肉及正常结肠黏膜组织中IGF-Ⅱ、IGF-ⅠR、IGFBP3的表达情况。结果:1)IGF-Ⅱ、IGF-ⅠR、IGFBP-3在结直肠癌组织中表达的阳性率均高于结直肠腺瘤、炎性息肉和正常组织,且具有统计学意义(P<0.05);2)IGF-Ⅱ、IGF-ⅠR、IGFBP-3在炎性息肉和管状腺瘤、混合型腺瘤及绒毛状腺瘤中表达阳性率依次增高,但差异无统计学意义(P>0.05);3)IGF-Ⅱ、IGF-ⅠR、IGFBP-3与患者的年龄、性别、吸烟情况、有无饮酒史及肿瘤家族史等指标之间均无统计学意义(P>0.05);4)IGF-Ⅱ、IGF-ⅠR、IGFBP-3间的表达呈正相关。结论:结直肠癌患者血清IGF-Ⅱ、IGF-ⅠR、IGFBP-3水平明显升高可能与结直肠癌的发生相关。     

加速试验法研究黄芩药材的贮藏稳定性

目的：采用加速试验法研究黄芩药材的贮藏稳定性。方法：黄芩药材置于湿度为70%、温度为37℃的恒温箱内,分别于0、1、2、个月取样,以红外光谱法和高效液相色谱法分析黄芩药材的整体变化和局部变化。结果：加速试验条件下,红外光谱法显示在贮藏期内黄芩中有效成分黄酮类已酸变为其它成分,糖（苷）类物质的含量减少;高效液相色谱法显示,在贮藏期内黄芩苷和汉黄芩苷的含量明显下降,黄芩素和汉黄芩素的含量先增加后减少。结论：黄芩药材的质量在贮藏期内发生明显变化,提示应有效控制黄芩药材的贮藏期。     

有氧运动和大豆多肽对高脂饮食大鼠胰岛素抵抗形成中肿瘤坏死因子-α和白介素-6分泌的影响

目的:探讨有氧运动和补充大豆多肽对高脂饮食大鼠胰岛素抵抗形成中肿瘤坏死因子-α和白介素-6分泌的影响。方法:在给SD大鼠喂饲高脂饮食的同时,进行10周的有氧运动锻炼或/和补充大豆多肽,实验结束时测定空腹血糖(FPG)、空腹胰岛素(FINS)、血清肿瘤坏死因子-α(TNF-α)和白介素-6(IL-6)等指标,并计算胰岛素敏感性指数(ISI)、稳态模型-IR指数(HOMA-IR)。结果(1)10周的高脂饮食可使大鼠FPG、FINS、HOMA-IR指数显著升高,而ISI显著降低,与此同时,有氧运动或补充SPH可以显著降低高脂饮食大鼠FPG、FINS、HOMA-IR指数,提高ISI指数。(2)高脂饮食可使大鼠血清IL-6水平显著升高,TNF-α水平有所升高,但无统计学意义。运动锻炼可以显著降低高脂饮食大鼠血清TNF-α和IL-6含量,而补充大豆多肽可以显著降低高脂饮食大鼠血清IL-6含量,但不能显著降低血清TNF-α含量;运动锻炼联合补充大豆多肽使高脂饮食大鼠血清TNF-α和IL-6含量进一步降低,具有显著的交互作用。结论:(1)10周的高脂饮食可以诱导大鼠IR的形成;运动训练或补充SPH可以预防高脂饮食大鼠IR的形成;(2)高脂饮食诱导大鼠IR的形成机制与高脂饮食大鼠TNF-α和IL-6分泌增多有关;而运动训练或补充大豆多肽可通过抑制TNF-α和IL-6的分泌预防IR的形成。     

兔脊髓缺血再灌注损伤与正常组蛋白质组的差异分析

目的建立脊髓缺血再灌注损伤双向凝胶电泳图谱,对照观察蛋白质的差异表达。方法建立脊髓缺血再灌注损伤模型,获取损伤和正常脊髓的蛋白质组双向电泳荧光图谱,观察差异蛋白的不同时间点的变化规律,建立缺血再灌注24 h与正常脊髓蛋白质组的匹配差异图谱,鉴定差异蛋白。结果成功建立损伤和正常的双向电泳荧光图谱和肽质量指纹图谱,比较再灌注损伤24 h组与正常组可检测到46个蛋白差异点,鉴定出10个差异蛋白。结论损伤24 h组较其他组变化明显,与正常脊髓的蛋白质组存在明显差异。     

Late gadolinium enhancement of acute myocardial infarction in mice at 7T: cine-FLASH versus inversion recovery

Purpose

To investigate myocardial infarction (MI), late gadolinium (Gd) enhancement (LGE), cardiovascular magnetic resonance imaging (CMRI) is used as the current gold standard for the in vivo diagnosis in patients and preclinical studies. While inversion recovery (IR) fast gradient echo LGE imaging is the preferred technique at clinical field strengths it remains to be investigated which is the best sequence at higher field strength. We therefore compared the IR technique against cine fast low shot angle (cine‐FLASH) for the quantification of MI size in mice at 7T in vivo.

Materials and Methods

Five mice were used to optimize cine‐FLASH and IR parameters. Nine mice were subsequently imaged with optimized parameters using both techniques 2–3 days after MI and ≈30 minutes post Gd injection.

Results

The difference in infarct size values was within 3.3% between the two CMRI techniques and within 7.5% of histological values by Bland–Altman analysis. Contrast‐to‐noise‐ratio between infarcted and normal tissue as well as blood was higher for cine‐FLASH with the additional benefit of a 2‐time‐fold shorter scan time than with the IR method. Furthermore, left ventricular function/volumes could be calculated from cine‐FLASH images before as well as after Gd injection.

Conclusion

In conclusion, cine‐FLASH LGE MRI represents an attractive alternative to IR LGE MRI for infarct size assessment in mice at high field strengths because it provides similar accuracy while being more robust, faster, and less user dependent. J. Magn. Reson. Imaging 2010;32:878–886. © 2010 Wiley‐Liss, Inc.     

Optical Properties of Bulk Single-Crystal Diamonds at 80–1200 K by Vibrational Spectroscopic Methods

Bulk diamonds show great potential for optical applications such as for use in infrared (IR) windows and temperature sensors. The development of optical-grade bulk diamond synthesis techniques has facilitated its extreme applications. Here, two kinds of bulk single-crystal diamonds, a high-pressure and high-temperature (HPHT) diamond and a chemical vapor deposition (CVD) diamond, were evaluated by Raman spectroscopy and Fourier Transform Infra-Red (FTIR) spectroscopy at a range of temperatures from 80 to 1200 K. The results showed that there was no obvious difference between the HPHT diamond and the CVD diamond in terms of XRD and Raman spectroscopy at 300–1200 K. The measured nitrogen content was ~270 and ~0.89 ppm for the HPHT diamond and the CVD diamond, respectively. The moderate nitrogen impurities did not significantly affect the temperature dependence of Raman spectra for temperature-sensing applications. However, the nitrogen impurities greatly influence FTIR spectroscopy and optical transmittance. The CVD diamond showed higher transmittance, up to 71% with only a ~6% drop at temperatures as high as 873 K. This study shows that CVD bulk diamonds can be used for IR windows under harsh environments.     

妊娠糖尿病患者网IRS-1与GLUT4的表达及其与胰岛素抵抗关系的研究

妊娠期糖尿病指妊娠前无糖尿病亦无糖耐量减低的妇女,在妊娠期间首次发生或发现的葡萄糖耐量异常.     

东菱迪芙和银杏达莫联合应用对大鼠局灶性脑缺血损伤的影响

目的探讨东菱迪芙和银杏达莫联合应用对大鼠局灶性脑缺血损伤的影响。方法采用大脑中动脉线栓法（MCAO）建立大鼠局灶性脑缺血再灌注模型,用免疫印迹法检测生存通路胞外信号调节酶（EBK）的活性,同时观察脑梗死体积比。结果东菱迪芙和银杏达莫可上调ERK蛋白活性,降低脑梗死体积,联合应用组间差异更显著。结论东菱迪芙和银杏达莫明显减轻脑缺血脑损伤,具有脑保护作用,联合应用效果更佳。