GST-hDaxx蛋白的构建及其原核表达产物的鉴定

 目的　构建GST hDaxx蛋白并在原核细胞中诱导表达GST hDaxx融合蛋白 ,并研究其与 p5 3的结合能力。方法　构建GST hDaxx融合蛋白原核细胞表达载体pGEX 4T/hDaxx ,在大肠杆菌 (E .col i)中用异丙基 β D 硫代半乳糖苷 (IPTG)诱导表达。表达产物用亲和层析柱加以纯化后 ,Westernblot鉴定表达产物与纯化物。通过共免疫沉淀反应与Westernblot观察hDaxx与p5 3的结合反应。结果　在原核细胞中成功表达了GST hDaxx融合蛋白 ,hDaxx与 p5 3可发生共免疫沉淀反应。 结论　 1.GST hDaxx融合蛋白成功表达 ;2 .hDaxx和 p5 3的相互结合提示它们可能与肿瘤的发生有关。     

药物代谢酶维生素E琥珀酸酯抑制苯并(a)芘

目的　探讨药物代谢酶在维生素E琥珀酸酯 (VES)抑制苯并 (a)芘毒性中的作用。方法　建立B(a)P诱导的小鼠前胃癌模型 ,观察不同途径投予VES对前胃癌的抑制作用。再选择最佳途径观察两相药物代谢酶在此过程中的变化。采用免疫荧光光度法检测小鼠肝脏微粒体 (S - 9组分 )中Ⅰ相药物代谢酶乙氧基异吩恶唑 0 -脱乙基酶(Ethoxyresorufin 0 -deethylase,EROD)活性 ;应用试剂盒测定S - 9组分中Ⅱ相药物代谢酶谷胱甘肽 -S -转移酶(GST)活性。结果　经口投予和腹腔注射VES均可明显降低B(a)P诱导的小鼠前胃癌的发生。VES可显著降低肝脏Ⅰ相药物代谢酶乙氧基异吩恶唑 0 -脱乙基酶 (EROD)的活性 (39 1± 3 0 5 ) ,与阳性对照组 (5 7 9± 3 16 )比较 ,有显著性差异。结论　VES可降低B(a)P诱导的小鼠前胃癌 ,作用机制可能是通过影响肝脏药物代谢酶的活性来实现。     

多肽:N-乙酰氨基半乳糖转移酶2的原核表达、纯化及酶活检测

目的：以人类多肽：N-乙酰氨基半乳糖转移酶2（ppGalNAc-12）为研究对象，利用载体pGEX-5X-3在大肠杆菌（E．Coli）BL21中原核表达其编码序列，并对表达产物进行纯化、复性及酶活检测。方法：首先利用PCR技术从克隆载体pDONR201-T2得到ppGalNAc-T2全长编码序列，将其亚克隆至原核表达载体pGEX-5X-3，形成重组表达质粒pGEX-5X-3／T2。重组质粒转化大肠杆菌DH5α，测序鉴定后转化BL21，异丙基硫代半乳糖（IPTG）诱导后，表达产物为主要以包涵体形式存在的融合蛋白。对其复性后用谷胱甘肽-琼脂糖（Glutathione-Sepharose）4B亲和层析柱进行纯化。然后根据ppGalNAc-T2的催化功能，设计底物，建立酶促反应体系，利用高效液相色谱（HPLC）进行酶活分析。结果：成功构建了原核表达重组载体pGEX-5X-3／T2，通过蛋白质电泳检测到分子量约为90 kD的融合蛋白的表达，利用亲和层析得到纯化的酶蛋白，并经Western印迹得以验证。反应后体系上柱洗脱后出现酶促反应的产物洗脱峰。结论：成功构建了重组表达载体pGEX-5X-3／T2，ppGalNAc-T2伞长编码序列被成功表达、纯化及复性，检测到具有酶活性。     

In vitro ex vivo assessment of Morinda citrifolia on drug metabolizing enzymes in spontaneously hypertensive rats

Morinda citrifolia Linn. (Rubiaceae), common name noni, has been used as a herbal medicine for over 2000 years. The consumption of noni, and especially the fruit, stresses the importance, urgency, and possibility of the examination of drug interaction when concomitantly administered with a drug. The objectives of this study were to determine the effects of noni juice (NJ) on aminopyrine N-demethylase (APND), uridine diphosphoglucuronosyl-transferase (UGT), and cytosolic glutathione S-transferase (GST) drug metabolizing enzymes and the molecular mechanism elucidation of NJ on APND using different inhibitors and stimulators. The in vitro results for APND showed that different concentrations of NJ significantly increased the activity in isolated hepatocytes at 1.0?ng/mL, 10?ng/mL, 10?μg/mL, 20?μg/mL, 50?μg/mL, and 100?μg/mL. The ex vivo results demonstrated that NJ (210?mg/kg) produced a statistically significant increase in APND activity following 1 day of NJ treatment. The results for UGT and GST showed a decrease in the activity of UGT at a dose of 21?mg/kg following 1 day of treatment, and at 2.1 and 21?mg/kg following 14 days of treatment. GST enzyme demonstrated an increase in activity by 100% for all doses following 1 day of treatment. Molecular mechanism elucidation of the ex vivo effect of NJ on phase I APND showed that KT5720 significantly reduced the activity as compared to control. A change in activity of APND, UGT, and GST following 1 day and 14 days of treatment suggests that all three metabolic pathways may play a role in herb–drug interaction by modulation of metabolic enzymes.     

Torsemide Versus Furosemide After Continuous Renal Replacement Therapy Due to Acute Renal Failure in Cardiac Surgery Patients

Acute renal failure (ARF) usually develops in 5% to 30% of patients undergoing heart surgery and is associated with a more complicated clinical evolution course and with an excessive mortality of up to 80%. The objective of this study was to verify the frequency of ARF in postoperative coronary artery bypass surgery with and without cardiopulmonary bypass, by the evaluation of renal function markers' performance [ plasma creatinine, plasma urea, urinalysis, fractional excretion of sodium, creatinine clearance and Alpha‐glutathione S‐transferase (α‐GST)], besides to verify possible relations between clinical variables involved in postoperative heart surgery and the occurrence of renal insufficiency.     

Glutathione S-transferase (GST) inhibitors

The glutathione S-transferases (GSTs; EC 2.5.1.18) comprise a family of widely distributed Phase II detoxication enzymes that catalyse the conjugation of a broad variety of reactive electrophiles to the nucleophilic sulfur atom of the major intracellular thiol, the tripeptide glutathione. The diverse functions, including catalytic GSH conjugation, passive ligandin-type binding and modulation of signal transduction, may be selectively targeted by different inhibitors. GST inhibitors are emerging as promising therapeautic agents for managing the development of resistance amongst anticancer agents. In diagnostic medicine, as well as in antiparasitic drug development, GST inhibitors are important lead molecules. In this review, the important molecules known for their GST inhibition together with potential therapeutic uses are summarised.     

注射用丹参多酚酸对急性脑梗死患者NIHSS评分、ADL评分和血清NSE、GST的影响

目的 观察注射用丹参多酚酸对急性脑梗死患者美国国立卫生研究院卒中量表（NIHSS）、日常生活活动能力（ADL）评分和血清神经元特异性烯醇化酶（NSE）、谷胱甘肽-S-转移酶（GST）的影响。方法 选取2016年1月1日—2017年7月1日南阳医专第一附属医院神经内科住院的急性脑梗死患者100例为研究对象,按照随机数字表法将患者随机分为对照组和观察组,每组50例。对照组患者在入院后常规治疗,观察组患者在对照组治疗的基础上静脉滴注射用丹参多酚酸,100 mg加入0.9%氯化钠液250 mL静脉滴注,1次/d,连续14 d。分别两组患者NIHSS、ADL评分及GST、NSE水平进行测定。结果 两组患者在治疗后14 d NIHSS评分ADL评分均较治疗前明显改善,差别具有统计学意义（P<0.05）;治疗后14 d,与对照组相比,观察组患者NIHSS评分明显下降,ADL评分明显升高,差别具有统计学意义（P<0.05）。两组患者在治疗后14 d,GST、NSE水平均较治疗前明显改善,差别具有统计学意义（P<0.05）;治疗后14 d,与对照组患者相比,观察组GST及NSE水平改善情况更明显,差别具有统计学意义（P<0.05）。结论 注射用丹参多酚酸能明显提高急性脑梗死患者血清GST水平,降低NSE水平,改善患者ADL、NIHSS评分。