药物配合“八段锦”治疗老年性类风湿关节炎

目的：探讨药物配合＂八段锦＂治疗老年性类风湿关节炎的临床疗效。方法：总结老年性类风湿关节炎的特点、病因病机、治疗方法,并结合临床观察药物配合八段锦治疗老年性类风湿关节炎的疗效。结果：经药物配合＂八段锦＂治疗有效率为94.44%。结论：药物配合气功＂八段锦＂可以有效缓解症状,疗效显著。     

反相高效液相色谱法测定清开灵中黄芩苷的含量

目的:测定清开灵注射液、清开灵颗粒(哈尔滨、广州)中黄芩苷的含量。方法:反相高效液相色谱法。色谱柱为Kro-masil C1 8(4.6 mm×15 0 mm,5 μm) ;流动相为甲醇-水-磷酸(6 0∶4 0∶0 .2 ) ;检测波长:2 80 nm;流速:1.0 ml·min- 1 ;柱温:30℃。结果:黄芩苷对照品溶液在2 5～2 0 0μg/ ml范围内呈良好的线性关系(r=0 .9995 ) ,平均回收率为10 6 .5 3% ,RSD为1.2 % (n=5 )。结论:该法快捷、简便、准确性高,为中药复方提供了更加简便、合理、可靠的质控方法。     

Calcium channel current facilitation in porcine adrenal chromaffin cells

 The mechanisms of depolarizing-prepulse-induced facilitation of Ca²⁺ channel current were investigated in a study of porcine chromaffin cells. The Ba²⁺ current evoked by a pulse to 0 mV was increased by a strong depolarizing prepulse (conditioning pulse), termed ”facilitation”. This facilitation increased with an increase in either the duration or the voltage of the conditioning pulse, and decreased with an increase in the interpulse interval. For example, the Ba²⁺ current was increased to 1.14 times the control (facilitation ratio) by a 150-ms conditioning pulse to +100 mV followed by a 10-ms interpulse interval. Forskolin, 8-bromo-adenosine 3′,5′-cyclic monophosphate (8-bromo-cAMP) and Rp-adenosine 3′,5′-cyclic monophosphothioate (Rp-cAMPS) did not affect the facilitation of the Ba²⁺ current, suggesting that a cAMP-dependent mechanism is not involved. Intracellular guanosine 5′-O-(3-thiotriphosphate) (GTPγS) decreased the Ba²⁺ current to 0.59 times the control and GDPβS increased it to 1.19. However, neither GTPγS nor guanosine 5′-O-(2-thiodiphosphate) (GDPβS) changed the amplitude of the Ba²⁺ current that was facilitated by the conditioning pulse. Thus, GTPγS increased the facilitation ratio to 2.05 and GDPβS decreased it to 1.05. Furthermore, the facilitation of the Ba²⁺ current was abolished by ω-conotoxin GVIA but not by either ω-agatoxin IVA or nifedipine. These results suggest that, in porcine chromaffin cells, there is a ω-conotoxin GVIA-sensitive N-type Ca²⁺ channel that is under the inhibitory control of a G protein, which can be relieved by a conditioning pulse. Received: 25 September 1997 / Received after revision: 14 November 1997 / Accepted: 16 December 1997     

加味八珍汤治疗糖尿病周围神经病变30例

目的：观察加味八珍汤治疗糖尿病周围神经病变（DPN）的疗效。方法：将60例DPN患者,采用单盲法,随机分为2组,对照组30例,口服维生素B1,每次10mg,每日3次;弥可保注射液（日本卫材株式会社生产）500μg,每日1次,肌注;拜阿司匹林片100mg,每日1次,口服;治疗组30例,在对照组基础上加用八珍汤治疗;平均治疗30d后统计疗效。结果：治疗组总有效率87%,对照组60%（P〈0.05）;治疗组治疗后血脂及运动传导速度（MNCV）、感觉传导速度（SNCV）的改善均较对照组明显（P〈0.05）。结论：加味八珍汤治疗DPN疗效显著。     

Differences of HBV genotypes and hepatocellular carcinoma in Asian countries

Hepatitis B virus (HBV) genotype B (HBV B) and genotype C (HBV C) are prevalent in Asia. Recently HBV B has been classified into two subtypes, HBV Ba, which is ubiquitous in Asia, and HBV Bj specific to Japan. However, little is known about etiological, virological and clinical differences among patients who have various genotypes and who developed hepatocellular carcinoma (HCC). We investigated the relation of HBV subgenotype with etiological and clinical differences of HCC patients between Taiwan and Okinawa in Japan. HBV Bj may be associated with lower incidence of HCC and older development of HCC while HBV Ba or HBV C may be associated withhigher incidence of HCC and younger development of HCC. In addition, we demonstrated the relationship of the specific mutation of HBV, T1653 mutation in the core promoter region, with development of HCC in Japanese patients with HBV C. These data suggest that great differences exist among patients with HCC who are infected with different HBV genotypes or genotype-specific mutations.     

巴马小型猪脑死亡状态下的肺脏形态变化及其机制

目的 探讨脑死亡状态下肺脏形态变化及可能的机制。方法 巴马小型猪10只，随机分为2组，即脑死亡组与对照组。应用改进的缓慢间断颅内加压法建立脑死亡模型，通过呼吸、循环支持维持实验动物脑死亡状态24h，对照组仅行开颅。分别测定脑死亡后第3、6、12、18和24h时血清中肿瘤坏死因子（TNF—α）、白细胞介素1（IL-1β）及IL-6水平；脑死亡后24h时取肺脏组织，HE染色观察肺脏组织变化，电镜观察肺脏超微结构变化，免疫组化染色观察蛋白激酶C（PKC—α）的表达水平，逆转录聚合酶链反应检测PKC—amRNA的表达水平。结果 对照组各检测时点的IL-1β、IL-6、TNF-α水平变化不明显，脑死亡组血清IL-1β、IL-6、TNF—α明显高于对照组（P〈0．05），并随脑死亡时间的延长而逐渐升高（P〈0．05）。肺组织中PKC-α蛋白及其mRNA水平明显高于对照组（P〈0．05）。对照组的肺组织在光镜及电镜下未见明显的损伤性变化，脑死亡组动物的组织结构发生明显改变，光镜下可见肺泡间隔增宽，肺泡腔有渗出液，肺毛细血管充血，肺组织中有淋巴细胞浸润；电镜下，脑死亡组的肺泡细胞胞质水肿，肺泡上皮Ⅱ型细胞线粒体肿胀，线粒体部分膜溶解等改变，微绒毛缺失。结论 脑死亡状态导致肺脏出现损伤性形态学变化，机体炎症介质水平升高；肺脏中PKC—α mRNA转录和蛋白翻译水平明显升高可能是肺脏发生损伤性形态学变化的原因之一。     

钾通道阻滞剂及毒毛花甙G对依血管内皮舒张作用的影响

四乙铵(TEA),Ba~(2+),格列本脲(可阻滞ATP敏感K~+通道)及毒毛花甙G均显著抑制Ach诱发的兔主动脉环依内皮舒血管效应.cromakalim的舒血管作用是不依赖内皮的,且为上述药物所抑制,本实验结果提示离体兔主动脉环上ACh诱发的依内皮舒张中,可能有ATP敏感的K~+通道及Na~-—K~+泵参与.     

Block and activation of the hyperpolarization-activated inward current by Ba and Cs in frog sinus venosus

Voltage clamp experiments were performed on isolated frog sinus venosus trabeculae using the double mannitol gap voltage clamp technique.On hyperpolarization from the holding potential (–30, –50 mV) to various potential levels slow activation of inward current was recorded. Several basic features of this current system resemble those of the currenti _f in mammalian pace-maker tissues. The current activates from a threshold ranging between –50, –70 mV and increases in the inward direction with the negative pulse amplitude. Conductance measurements during current development show a conductance increase. The current is strongly reduced during perfusion with Na-free medium.However, there were several important differences in its properties from those of thei _f current in other preparations. Ba in concentrations of 0.3–5 mM reduces the amplitude of the inward current in a concentration-dependent manner. Cs in low concentration range (1–10 mM) fails to have any effect on the time dependent current. Cs concentrations higher than 10 mM increase the current amplitude in a dose-dependent manner. The current increase induced by Cs still remains in Na-free solution and is not affected by Cl replacement. These results suggest that Cs may carry inward current. The identity of the ionic mechanism responsible for the observed current is discussed.     

Utility of the Ba/F3 cell system for exploring on‐target mechanisms of resistance to targeted therapies for lung cancer

Molecular targeted therapies are the standard of care for front‐line treatment of metastatic non‐small‐cell lung cancers (NSCLCs) harboring driver gene mutations. However, despite the initial dramatic responses, the emergence of acquired resistance is inevitable. Acquisition of secondary mutations in the target gene (on‐target resistance) is one of the major mechanisms of resistance. The mouse pro‐B cell line Ba/F3 is dependent on interleukin‐3 for survival and proliferation. Upon transduction of a driver gene, Ba/F3 cells become independent of interleukin‐3 but dependent on the transduced driver gene. Therefore, the Ba/F3 cell line has been a popular system to generate models with oncogene dependence and vulnerability to specific targeted therapies. These models have been used to estimate oncogenicity of driver mutations or efficacies of molecularly targeted drugs. In addition, Ba/F3 models, together with N‐ethyl‐N‐nitrosourea mutagenesis, have been used to derive acquired resistant cells to investigate on‐target resistance mechanisms. Here, we reviewed studies that used Ba/F3 models with EGFR mutations, ALK/ROS1/NTRK/RET fusions, MET exon 14 skipping mutations, or KRAS G12C mutations to investigate secondary/tertiary drug resistant mutations. We determined that 68% of resistance mutations reproducibly detected in clinical cases were also found in Ba/F3 models. In addition, sensitivity data generated with Ba/F3 models correlated well with clinical responses to each drug. Ba/F3 models are useful to comprehensively identify potential mutations that induce resistance to molecularly targeted drugs and to explore drugs to overcome the resistance.     

Research Progress of Ba(Zn1/3Nb2/3)O3 Microwave Dielectric Ceramics: A Review

Ba(Zn_1/3Nb_2/3)O₃ (BZN) microwave dielectric ceramics have attracted great attention due to their high-quality factor (Q), near-zero temperature coefficient of resonant frequency (τ_f), and suitable dielectric constant (ε_r), making them promising materials for application in microwave devices. Due to their superior dielectric properties, composite perovskite ceramics are widely used in the field of microwave communication, base stations, navigation, radar, etc. This article summarized the latest research progress of BZN ceramics and discusses the main preparation methods and performance modifications. Furthermore, the problems faced by BZN ceramics and solutions to improve their performance, as well as their potential applications, are analyzed. This article provides a reference for the design and preparation of BZN ceramics.