小儿尿道下裂尿道板组织中雌激素受体及微血管密度的表达及临床意义

目的 探讨尿道下裂患儿尿道板组织和尿道部皮肤组织中雌激素受体(ER)和微血管密度(MVD)的表达及意义.方法 选取2013年6月-2015年1月天津儿童医院收治的尿道下裂手术患儿30例,术中分别取部分尿道板和尿道部皮肤组织,检测不同组织中ER及MVD的表达及分布情况.结果 2组均检测到ER及MVD的表达.尿道板组织与尿道部皮肤组织中ER表达水平比较差异无统计学意义(P＞0.05),尿道板组织中MVD低于尿道部皮肤组织(P＜0.05).结论 尿道板组织和尿道部皮肤组织ER含量接近,可能与尿道发育异常有关;尿道板组织中存在微血管分布,为保留尿道板的尿道成形术提供了理论依据;尿道板组织内MVD显著降低,可能为术后发生尿瘘的原因之一.     

Comparative hepatocarcinogenicity of hexachlorobenzene, pentachlorobenzene, 1,2,4,5-tetrachlorobenzene, and 1,4-dichlorobenzene: application of a medium-term liver focus bioassay and molecular and cellular indices.

Of the twelve different chlorobenzene isomers, a thorough evaluation of carcinogenicity has only been assessed on monochlorobenzene, 1,2-, and 1,4-dichlorobenzene, and hexachlorobenzene. In the studies presented here, we measured the ability of 1,4-dichlorobenzene (DCB), 1,2,4,5-tetrachlorobenzene (TeCB), pentachlorobenzene (PeCB), and hexachlorobenzene (HCB) to promote glutathione S-transferase pi (GSTP1-1) positive preneoplastic foci formation in rat liver, following diethylnitrosamine (DEN) initiation. The results from these studies show that TeCB, PeCB, and HCB all promote the formation of GSTP1-1 positive foci and that DCB does not. The numbers and area of foci were greatest following HCB promotion, and TeCB and PeCB were approximately equal in their promoting ability. Levels of hepatic CYP1A2, CYP2B1/2, non-focal GSTP1-1, and c-fos were measured in response to treatment with the 4 chlorobenzene isomers, as were reduced glutathione (GSH) and oxidized glutathione (GSSG) levels. Results from these studies show that induction of CYP1A2 and CYP2B1/2 have correlation with both the presence and degree of GSTP1-1 foci promotion by the 4 chlorobenzenes. Alterations in GSH and GSSG levels were similar in PeCB- and TeCB-treated animals in that GSSG levels were significantly decreased, whereas HCB and DCB did not have this effect, although HCB treatment led to a significant increase in GSH levels. We conclude that induction of CYP1A2 or CYP2B1/2 by chlorobenzene isomers may indicate promotional ability, and that this property might be exploited to predict the hepatocarcinogenicity of other chlorobenzene isomers.     

The latest review on the polyphenols and their bioactivities of Chinese Morus plants

The mulberry tree (Morus alba) plays a key role in agriculture, and its different parts have been used as popular Traditional Chinese Medicines for thousands of years. There are 16 species belonging to the Morus genus. Among them, 11 species distribute in China, most of which have been used as the substitutes of M. alba in local provinces. This review summarizes the structural characters of polyphenols, the main components in Morus, including Diels–Alder-type adducts, flavonoids, 2-arylbenzofurans, and stilbenes, and also their related bioactivities in the last 10 years.     

实验用藏猪和巴马小型猪线粒体DNA控制区碱基序列比较

目的：分析比较实验用藏猪和巴马小型猪线粒体DNA控制区D．100p区碱基序列的差异,探讨小型猪的遗传标记。方法：提取59头藏猪和16头巴马小型猪血液基因组DNA,设计特异引物扩增mtDNAD．100p,从凝胶中纯化后直接测序,进行比较。结果：2种小型猪mtDNAD-loop都存在串连重复序列区和非重复序列区（5’端和3’端）;重复序列区处于中间位置,藏猪有2种类型（A型和B型）,巴马小型猪只有1种类型（A型）;藏猪D—loop5’端（704bp）发现有20个变异位点,其中有3个主要的转换位点：305,500,691,巴马小型猪未发现多态位点,与藏猪以及其他猪相比,巴马小型猪D．100p5’端在180、404位有2个碱基差异。结论：藏猪mtDNA D-100p区碱基序列存在2种类型（A型和B型）;巴马小型猪mtDNAD—loop区碱基序列多态性较低,有2个遗传标记位点。     

复方丙谷胺西咪替丁片溶出度测定方法的研究

目的：确定复方丙谷胺西昧替丁片溶出度测定的方法。方法：采用转篮法，以磷酸盐缓冲液（pH7．2）为溶出介质，转速100r·min^-1，高效液相法检测。结果：45分钟的溶出量不少于70％，三种主要成分丙谷胺、西咪替丁、尿囊素分别在120～280μg／ml；58．4～136．4μg／ml；65．3～153．7μg／ml范围内呈现良好的线性关系。结论：本方法操作简单，准确可靠，能满足质量控制的要求。     

经左室流出道消融治疗疑似右室流出道起源室性早搏1例并文献复习

心室流出道(ventricular outflow tract,VOT)起源室性早搏(premature ventricular contraction,PVC)因临床常见,具有典型的心电图(ECG)特征,诊断并不困难,射频消融术是该病非药物治疗的主要手段。文中报道1例初步诊断右心室流出道起源(RVOT)的PVC的患者,于左心室流出道(LVOT)获得成功消融的诊治经过。文献复习了PVC定位的方法、VOT局部独特的解剖特点对定位的影响,以及三维标测新技术对PVC消融手术的帮助。     

移植性肿瘤的自然消退与免疫形成的研究

本文对小鼠移植性肿瘤的自然消退与其免疫形成进行观察,结果表明:自然消退的EAC昆明鼠对肿瘤的再次攻击具有强烈的排斥反应。应用化疗药物RS034(Sodium sald.ofbishemisuccinate of 7β-Hydroxycholesterol)治愈的L_(1210) DBA/2小鼠进行肿瘤再次移植时,同样产生对抗作用。而用化疗药物5-Fu治愈的小鼠没有出现免疫排斥反应。     

Preparation and characterisation of the colistin-entrapped liposome driven by electrostatic interaction for intravenous administration

Potential use of liposome for polycationic colistin is hindered by their phospholipid membrane permeability. In this study, liposomes were modified with sodium cholesteryl sulphate (Chol-SO₄^?) for improving the colistin loading by enhancing the colistin-bilayer electrostatic attraction. We have evaluated two liposomes: colistin-entrapped liposome of Chol-SO₄^? (CCL) and coated Chol-SO₄^?/colistin complex liposome (CCCL). In comparison with CCL which formed large aggregates at Chol-SO₄^?/colistin charge ratio below 2:1, CCCL showed a smaller size less dependent on the charge ratio, probably arising from more colistin entrapped on the inner leaflet of bilayer. Both liposomes exhibited significantly increased entrapment efficiency as compared with the liposome without Chol-SO4^?. But colistin released upon dilution, implying free transfer of colistin through bilayers. Pharmacokinetics results showed the approximately four-fold increase in the plasma AUC_0–8?h for CCCL and CCL as compared with colistin solution, showing potential benefit for infectious target localisation by prolonging the systemic circulation of colistin.     

Enhancing the Buccal Mucosal Delivery of Peptide and Protein Therapeutics

Pharmaceutical Research - With continuing advances in biotechnology and genetic engineering, there has been a dramatic increase in the availability of new biomacromolecules, such as peptides and...