“Real life” polycyclic aromatic hydrocarbon (PAH) mixtures modulate hCG,hPL and hPLGF levels and disrupt the physiological ratio of MMP-2 to MMP-9 and VEGF expression in human placenta cell lines

Using JEG-3 and BeWo cells, we examined the effect of “real life” mixtures of polycyclic aromatic hydrocarbons (PAHs), at doses reported in maternal blood (Mix I) and in placental tissue (Mix II), on human chorionic gonadotropin (hCG), placental lactogen (hPL) and placental growth factor (hPLGF) secretion, protein expression and immunolocalization. Additionally, the action of PAH mixtures on basal and hormone-stimulated matrix metalloproteinase-2 (MMP-2), MMP-9 and vascular endothelial growth factor (VEGF) protein expression was evaluated. Under basal conditions, the PAH mixtures increased hCG and decreased hPLGF levels in both cell lines, while hPL expression was stimulated in JEG-3 and inhibited in BeWo. There was no effect on the MMP-2/MMP-9 ratio or VEGF expression. In hormone-stimulated cells, PAH mixtures changed the MMP-2/MMP-9 ratio in JEG-3 cells in favor of MMP-9, while in BeWo MMP-2 was favored. The effect on VEGF expression was cell specific and dependent on the mixture. In hCG-treated cells, only Mix II inhibited VEGF expression in JEG-3 cells. Neither PAH mixtures affected this protein in BeWo cells. In hPL-treated cells, Mix I had a stimulatory effect in JEG-3 cells, while Mix II exerted an inhibitory effect in BeWo cells. In hPLGF-treated cells, Mix II decreased in JEG-3 cells, but in BeWo cells, both mixtures increased VEGF expression. Considering that the evaluated protein hormones play crucial roles in angiogenesis and neovascularization in the placenta, “real life” PAH mixtures by disrupting protein hormones levels, the MMP-2/MMP-9 ratio and VEGF expression can lead to insufficiency and many pregnancy-related disorders.     

壮精合剂治疗围绝经期综合征58例

目的:探讨壮精合剂治疗围绝经期综合征的临床疗效。方法:选取符合围绝经期综合征诊断标准的病人58例,应用壮精合剂加减口服治疗1~2个月。结果:显效31例占53.4%;有效23例占39.7%;无效4例占6.9%,总有效率为93%。结论:壮精合剂治疗围绝经期综合征能收到良好的临床疗效。     

A mixture of experts network structure for modelling Doppler ultrasound blood flow signals

Mixture of experts (ME) is a modular neural network architecture for supervised learning. This paper illustrates the use of ME network structure to guide modelling Doppler ultrasound blood flow signals. Expectation-Maximization (EM) algorithm was used for training the ME so that the learning process is decoupled in a manner that fits well with the modular structure. The ophthalmic and internal carotid arterial Doppler signals were decomposed into time-frequency representations using discrete wavelet transform and statistical features were calculated to depict their distribution. The ME network structures were implemented for diagnosis of ophthalmic and internal carotid arterial disorders using the statistical features as inputs. To improve diagnostic accuracy, the outputs of expert networks were combined by a gating network simultaneously trained in order to stochastically select the expert that is performing the best at solving the problem. The ME network structure achieved accuracy rates which were higher than that of the stand-alone neural network models.     

逍遥合剂的质量标准研究

目的：建立逍遥合剂的质量标准。方法;采用TLC法对处方中的白芍、甘草进行定性鉴别;用HPLC法测定芍药苷的含量。结果：在TLC色谱中均能检出白芍、甘草、芍药苷在0．3980－1．3930μg范围内呈良好的线性关系,r=0.9999,平均回收率为98.5%,RSD=0.83%。结论：所建立的方法可准确地进行定性,定量检测可用于该制剂的质量控制。     

46例急性有机磷农药中毒死亡原因分析

目的 :探讨急性有机磷中毒 (AOPP)死亡。方法 :回顾分析 1998年至 2 0 0 0年 8月死亡病例 4 6例 ,占同期中AOPP5 0 8例的 9.0 6 %。结果 :洗胃不彻底 15例 (32 .6 % ) ,阿托品用量不足 12例(2 6 .1% ) ;中间综合征 (IMS) 7例 (15 .2 % )阿托品中毒 5例 (10 .9% ) ;混合性中毒 3例 (6 .5 % ) ,其余存在严重并发症。结论 :表明洗胃不彻底 ,阿托品用量不足及中毒、IMS、混合性中毒是AOPP死亡的主要原因。对AOPP并发的紧急凶险症状未及时控制也是其死亡原因之一。     

强心合剂对大鼠充血性心力衰竭血流动力学及心钠素的影响

目的：主要观察强心合剂对实验性大鼠充血性心力衰竭的作用及机理。方法：观察强心合剂对尾静脉注射盐酸阿霉素制备心肌病性充血性心力衰竭（CHF）大鼠模型的血流动力学,血浆心钠素等的影响,结果：强心合剂能改善CHF大鼠血流动力学各项指标,提高LVSP,＋dp/dtmax降低LVEDP－dp/dtmax,缩短T－dp/dtmax,减少血浆心钠素含量;降低肺,肝重指数,且作用效应以中药大剂量组最为明显。结论：强心合剂不仅改善实验性大鼠心脏收缩功能,而且改善舒张功能,减轻脏器充血。     

川芎茶调散及其4种改型制剂的质量分析

目的：考察川芎茶调散改型制剂的质量,分析影响质量的工艺因素。方法：按中国药典检测方法对各制剂所含挥发油及浸出物进行定量分析,并用ＴＬＣ法对各制剂进行川芎、白芷的主成分鉴别。结果：挥发油含量最高为０．４％（散剂、片剂）,最低为０．０８５％（袋泡剂）;醇溶性浸出物最高为１５．７６％（散剂）,最低为１０．２３％（冲剂）;水溶性浸出物最高为２４．８９％（散剂）,最低为１８．４３％（袋泡剂）;袋泡剂中川芎、白芷的ＴＬＣ鉴别为阴性。结论：与散剂相比,４种改型制剂均存在不同程度的质量问题,其中冲剂、袋泡剂各项指标最低,提示单纯以水提取的剂改工艺欠合理     

四君子合剂的薄层色谱鉴别

目的：鉴别四君子合剂中的党参、白术、茯苓、甘草。方法：采用薄层色谱法。结果：建立简便、灵敏、可靠的薄层色谱(TLC)法。结论；可用于本品质量控制。     

复方三根制剂对MDR细胞株K562/ADR和K562/VCR逆转作用的研究

目的：研究复方中药——复方三根制剂对多药耐药(MDR)细胞株的逆转作用。方法：应用MTT比色法，观察复方三根制剂对MDR细胞的逆转作用。运用流式细胞仪(FCM)，测定其对耐药细胞积聚和外排阿霉素(ADR)的影响，以及对耐药株细胞表达P=gp的影响。结果：复方三根制剂可部分恢复K562／ADR和K562／VCR耐药细胞对ADR的敏感性，而对VCR抗药性的逆转作用不明显；可增加K562／ADR和K562／VCR耐药细胞内ADR的积聚，并对外排ADR有一定影响；可部分下调p-gp的表达。结论：复方三根制剂可部分逆转耐药细胞的抗药性。     

温经化瘀合剂药效学研究

目的：观察温经化瘀合剂(当归、川芎、香附、益母草等)治疗痛经、月经不调等作用。方法：对小鼠子宫、卵巢进行重量测定，二甲苯致小鼠耳肿胀法，缩宫素诱发大鼠痛经模型和前列腺素E1诱发小鼠痛经模型法，对大鼠离体子宫收缩活动的影响。结果：温经化瘀合剂能明显增加小鼠子宫重量，减轻二甲苯引起的小鼠耳肿胀度，减少缩宫素所致大鼠扭体反应次数和前列腺素E1所致小鼠扭体反应次数，既能使正常大鼠离体子宫收缩，又能对抗缩宫素对大鼠离体子宫的收缩作用。结论：温经化瘀合剂具有镇痛、抗炎作用，对子宫有双向调节作用。