Decreased blood riboflavin levels are correlated with defective expression of RFT2 gene in gastric cancer

AIM: To investigate the relationship between blood riboflavin levels and riboflavin transporter 2 (RFT2) gene expression in gastric carcinoma (GC) development.METHODS: High-performance liquid chromatography was used to detect blood riboflavin levels in patients with GC. Real-time fluorogenic quantitative polymerase chain reaction and immunohistochemistry were used to analyze the expression of RFT2 mRNA and protein in samples from 60 GC patients consisting of both tumor and normal tissue.RESULTS: A significant decrease in the RFT2 mRNA levels was detected in GC samples compared with those in the normal mucous membrane (0.398 ± 0.149 vs 1.479 ± 0.587; P = 0.040). Tumors exhibited low RFT2 protein expression (75%, 16.7%, 8.3% and 0% for no RFT2 staining, weak staining, medium staining and strong staining, respectively), which was significantly lower than that in the normal mucous membrane (10%, 16.7%, 26.7% and 46.7% for no RFT2 staining, weak staining, medium staining and strong staining, respectively; P < 0.05). Tumors with low RFT2 expression were significantly associated with tumor stage and histological grade. Moreover, a significantly decrease in Uyghur patients was observed compared with Han patients. However, other parameters-gender, tumor location and lymph node metastasis-showed no significant relationship with RFT2 expression. Blood riboflavin levels were reverse correlated with development of GC (1.2000 ± 0.97 569 ng/mL in high tumor stage patients vs 2.5980 ± 1.31 129 ng/mL in low tumor stage patients; P < 0.05). A positive correlation of plasma riboflavin levels with defective expression of RFT2 protein was found in GC patients (χ² = 2.619; P = 0.019).CONCLUSION: Defective expression of RFT2 is associated with the development of GC and this may represent a mechanism underlying the decreased plasma riboflavin levels in GC.     

蜂胶黄酮PB3A作用下结肠癌细胞株中miRNA-198和miRNA-296-5p的表达及功能预测

目的:探讨蜂胶黄酮短叶松素-3-乙酸酯(pinobanksin-3-acetate,PB3A)对结肠癌SW480细胞微小RNA(microRNA,miRNA)表达谱的影响,为结肠癌的治疗及靶向药物研发提供理论依据。方法:使用miRNA芯片技术分析检测蜂胶黄酮PB3A处理人类结肠癌SW480细胞后miRNA表达谱的变化。通过实时荧光定量PCR方法检测miRNA-198和miRNA-296-5p的表达水平,以此来验证miRNA芯片结果的准确性和可靠性。利用miRWalk、Micro T、miRanda等12个网上数据库预测这2条miRNAs的靶基因并进行靶基因功能富集分析。结果:miRNA芯片分析结果显示,蜂胶黄酮PB3A干预24 h后结肠癌SW480细胞中差异表达倍数在2倍及以上的miRNA有267条,其中差异表达倍数达10倍及以上的miRNA有30条,28条为上调表达,2条下调表达;RT-qPCR实验结果显示miRNA-198和miRNA-296-5p的表达量趋势跟miRNA芯片结果一致,表达差异有统计学意义(P0.05)。miRNA靶基因预测发现miRNA-198有859个靶基因,miRNA-296-5p有906个靶基因;对这些可能被调控的靶基因进行Gene Class分析,结果显示miRNA-198和miRNA-296-5p的靶基因功能主要为转录因子、拷贝数变异、细胞分化、癌基因、蛋白激酶、组蛋白、转移癌基因、肿瘤抑制基因等(P0.05)。信号通路富集分析结果显示,miRNA-198靶基因显著富集于肿瘤通路、Wnt信号通路、胞吞通路、Erb B信号通路、黏着斑通路、黑素生成通路等信号通路,而miRNA-296-5p靶基因在MAPK信号通路、胞吞通路、轴突导向通路、Wnt信号通路、胰岛素信号通路、钙离子信号通路等信号通路中出现聚集(P0.05)。结论:蜂胶黄酮PB3A影响结肠癌SW480细胞的miRNA表达谱。PB3A作用下miRNA-198和miRNA-296-5p的异常表达可能参与PB3A抗结肠癌的过程。     

Correlation analysis of riboflavin,RFT2 and Helicobater pylori in gastric carcinoma

Objective: To investigate the relationship between tissue riboflavin level and riboflavin transporter 2 (RFT2) protein expression, and the relationship between Helicobacter pylori (H.pylori) infection and the plasma riboflavin level in gastric carcinoma (GC). Methods: Enzyme-linked immunosorbent assay (ELISA) was used to detect tissue riboflavin level in patients with GC. Western blotting was applied to analyze the expression of RFT2 protein in 60 tissue samples from gastric carcinoma together with their normal tissues. The Warthin-starry method, rapid urease test and ¹⁴C-UBT were administered to detect the infection of H.pylori. High performance liquid chromatography (H.PYLORILC) was performed to detect plasma riboflavin level in the GC. Results: A significant decrease in the tissue riboflavin level was detected in GC samples compared to those in the normal mucous membrane (17.02±3.91 vs. 21.0±4.73; P = 0.043), and a significant decrease in the RFT2 protein was found in GC samples compared to those in the normal mucous membrane (0.92±0.39 vs. 1.23±0.51; P = 0.042). A positive correlation of tissue riboflavin level with defective expression of RFT2 protein was observed in GC patients (χ² = 1.969; P = 0.039). Plasma riboflavin level in gastric cancer without H.pylori infection group (1.6674 ng/mL ±0.37009 ng/mL) was higher than H.pylori infection group (1.2207 ng/mL ±0.17727 ng/mL, P = 0.043). Conclusion: The results indicate that RFT2 plays an important role in gastric carcinogenesis by modulating riboflavin absorption. H.pylori infection affects plasma riboflavin level and the prognosis of patients with gastric cancer.     

1951～2007年新疆猩红热流行特征分析

目的掌握新疆猩红热的流行状况,为制定防制策略和预测疫情趋势提供依据。方法对1951—2007年新疆猩红热的疫情进行描述分析并了解发病水平和流行特征。结果57年问新疆猩红热疫情呈现波动起伏状态,具有一定的周期性,有过2次大的流行;全年均有病例发生;发病集中于学生、幼托儿童和散居儿童;北疆地区发病高于南疆地区;1994年之后全疆发病水平呈现相对较低状态,2002年起猩红热疫情呈上升趋势。结论3～14岁年龄组为新疆猩红热发病的高危人群,应加强全疆中、小学校和托幼机构疫情监测,提高医疗机构的诊疗水平,防止暴发流行。     

雌二醇对兔离体血管条收缩及钙流动的影响

用离体兔胸主动脉条标本观察雌二醇对NE、KCL和CaCl_2引起血管收缩的量—效曲线的影响,发现大剂量Est使NE、KCL和CaCl_2的量—效曲线非平行右移,最大反应均轻度压低IC_(50),分别为250umol.L~(-1)和220umol.L~(-1);”提示Est的扩张血管作用,可能与抑制血管平滑肌膜Ca~(++)内流内关。     

基于HPLC的维医“异病同证”肿瘤患者血浆氨基酸代谢研究

目的：探讨不同肿瘤异常黑胆质证患者体内氨基酸代谢变化过程，从而认识维医“异病同证”氨基酸代谢特点。方法：选择15名健康志愿者和肺癌、宫颈癌、乳腺癌及胃癌患者各30例(每种肿瘤包括异常黑胆质证和非异常黑胆质证患者各15例)。对健康组和患者血浆采用高效液相色谱法(high-performance liquid chromatography，HPLC)进行19种氨基酸的定量检测，并比较健康志愿者与异常黑胆质证患者以及异常黑胆质证与非异常黑胆质证患者之间的差异。结果：肺癌、宫颈癌、乳腺癌及胃癌异常黑胆质证患者血浆氨基酸含量除个别氨基酸外都明显低于健康对照组(P<0.05)；肺癌异常黑胆质证患者血浆苯丙氨酸、丝氨酸、胱氨酸、缬氨酸、异亮氨酸、亮氨酸和天冬氨酸含量比非异常黑胆质证患者高(P<0.05)；宫颈癌异常黑胆质证患者血浆精氨酸含量比非异常黑胆质证患者低，但胱氨酸含量比非异常黑胆质证患者高(P<0.05)；乳腺癌异常黑胆质证患者血浆亮氨酸、丝氨酸、牛磺酸、胱氨酸、酪氨酸、缬氨酸、异亮氨酸和天冬酰胺等氨基酸含量比非异常黑胆质证患者高(P<0.05)；胃癌异常黑胆质证患者血浆胱氨酸含量比非异常黑胆质证患者高，而苯丙氨酸、苏氨酸和精氨酸含量比非异常黑胆质证患者低(P<0.05)。结论：不同肿瘤异常黑胆质证患者与对应的非异常黑胆质证患者血浆氨基酸代谢差异有共性，也有明显的不同。     

Aqueous extracts of Ocimum basilicum L. (sweet basil) decrease platelet aggregation induced by ADP and thrombin in vitro and rats arterio--venous shunt thrombosis in vivo

Objective

To study the effects of aqueous extract of Ocimum basilicum L (OBL) on platelet aggregation and experimental thrombus.

Methods

Platelet aggregation induced by ADP (5 μM) and thrombin (4 UI), and thrombus weight in an arteriovenous thrombosis (AVT) model were tested after 2 weeks treatment with 15, 75 and 375 mg/kg OBL orally in rats, compared to 8.8 mg/kg/day aspirin. AVT was also tested 2 h after 75 mg/kg OBL orally, after 3 and 7 days treatment, and one, three and seven days after the end of a two-week treatment. Analysis was done by ANOVA followed by protected t-tests (Tukey).

Results

OBL (15, 75, 375 mg/Kg) dose-dependently inhibits platelet aggregation by ADP and thrombin, with 75 mg/kg/day having approximately the same effect as 8.8 mg/kg/day aspirin. ADP induced aggregation reached 45%, 28% and 18% for OBL, respectively, 15, 75, 375 mg/kg compared to 71% for control and 27% for aspirin (all p < 0.01 except aspirin vs. OBL 75 mg/kg/day p = 0.7). Thrombin-induced aggregation reached 33%, 22%, 21% for OBL, respectively, 15, 75, 375 mg/kg compared to 67% for control and 48% for aspirin (all p < 0.01 except OBL 75 vs. OBL 375 mg/kg/day, p = 1.0). Compared to a control thrombus weight of 48.1 mg (SD 4.9), thrombus weight was 29.4 (3.3), 19.0 (1.9) and 12.3 (1.7) after treatment for 2 weeks with 15, 75 and 375 mg/kg OBL, respectively, and 27.4 (5.3) after 8.8 mg/kg aspirin (all p < 0.001 except aspirin vs. OBL 75 mg/kg/day p = 1.0). Maximum effect of OBL was reached after one week's treatment. The effect subsided between 3 and 7 days.

Conclusion

OBL possesses an inhibitory effect on platelet aggregation induced by ADP and thrombin, that is dose-dependent and results in an anti-thrombotic effect in vivo which develops progressively over 7 days and disappears over 3-7 days. The active ingredient now needs to be characterized.     

老年患者颈动脉粥样斑块与血脂、血糖水平的相关性研究

目的 探讨老年患者血脂、血糖水平与颈动脉粥样斑块形成的关系.方法采用高分辨彩色多普勒超声,对111例老年患者进行颈动脉超声检查,测定空腹血糖,总胆固醇(TC),甘油三酯(TG),高密度脂蛋白(HDL-C),低密度脂蛋白( LDL-C),并进行相关的统计学分析.结果颈动脉粥样斑块组的老年患者空腹血糖、总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白(HDL-C)、低密度脂蛋白(LDL-C)的水平明显高于颈动脉超声结果正常的老年患者,两组比较,差异有显著性(P<0.05).结论血脂、血糖可作为老年患者颈动脉粥样斑块形成的危险因子.     

424例新疆不同民族胃癌特征分析

目的：了解近8年来就诊于我院的胃癌患者流行病学及临床病理资料的特点。方法：以我院2003年-2010年收治的行手术治疗的424例胃癌患者为研究对象,对其一般资料、病理类型、发生部位、临床分期等进行回顾性分析。结果：424例胃癌患者中,男女比为3．36：1,年龄23—83岁,中位年龄61岁,高发年龄61—70岁。临床大体病理分型上,BorrmannⅡ型占大多数（78．77％）;病理组织学类型以腺癌居多,占81．6％。分化程度以低、中分化为主。TNM临床分期中以Ⅲ期为主,占41．0％。民族分组分析发现汉族以胃下部（幽门、胃窦）多见,而维吾尔族偏上,以胃中部（胃体、胃角）多见;维吾尔族发病年龄较汉族相对提前,肿瘤大小较汉族大;维吾尔族肿瘤T分期,TNM分期较汉族晚。结论：胃癌老年男性易患,组织学病理类型以低、中分化腺癌多见。各民族组间的临床特征有所不同,在临床上应采取相应的诊疗措施。行手术治疗的大部分为中晚期患者,胃癌的早期诊断有待进一步提高。     

多壁碳纳米管表面甘草酸分子印迹聚合物的制备及其应用

目的:研制甘草酸为模板的固相萃取柱,并将其应用到药草中高纯度甘草酸的分离富集方面。方法:以丙烯酰胺修饰的碳纳米管为载体,甘草酸为模板,丙烯酰胺为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,N,N-二甲基甲酰胺(DMF)为致孔剂,采用沉淀聚合技术,在碳纳米管表面成功接枝甘草酸印迹聚合材料。采用红外光谱、扫描电镜和热重分析对印迹材料的性能进行表征。结果:当功能单体为丙烯酰胺,沉淀聚合温度为60℃,致孔剂是DMF,EGDMA与溶剂比例为1∶20时,能够在在碳纳米管表面印迹一层稳定、均匀的印迹材料;Scatchard模型表明,多壁碳纳米管-分子印迹聚合物(MWCNTs-MIP)对甘草酸有着不同亲和力的2种结合位点,即高结合位点的平衡常数(Kd)1.17 mmol·L-1,最大表观吸附量(Qmax)741.5μg·g-1,低结合点的Kd 3.96 mmol·L-1,Qmax1 668.5μg·g-1,并且MWCNTs-MIP对甘草酸有特异性识别能力。结论:优化条件合成的分子印迹聚合物具有更好的形态结构,对目标分子具有很好的吸附效率,故作为固相萃取材料应用于药草中甘草酸的分离富集方面有一定研究价值。