鹅掌藤中三萜类化合物的分离与鉴定

目的研究五加科鹅掌柴属植物鹅掌藤(Schefflera arboricola)枝茎的化学成分.方法采用柱色谱分离,通过理化数据和光谱分析确定化合物的结构.结果从鹅掌藤乙酸乙酯提取物中分离得到7个三萜化合物,分别鉴定为羽扇醇(1)、桦木酸(2)、3-epi-betulinic acid(3)、齐墩果酸(4)、3-乙酰齐墩果酸(5)、mesembryanthemoidigenic acid(6)、quinatic acid(7).结论化合物1、5、6、7为首次从该属植物中分得.     

Gatifloxacin inducing apoptosis of stromal fibroblasts through cross-talk between caspase-dependent extrinsic and intrinsic pathways

AIM: To reveal the cytotoxicity and related mechanisms of gatifloxacin (GFX) to stromal fibroblasts (SFs) in vitro. METHODS: SFs were treated with GFX at different concentrations (0.009375%-0.3%), and their viability was detected by MTT method. The cell morphology was observed using light/transmission electron microscope. The plasma membrane permeability was measured by AO/EB double-staining. Then cell cycle, phosphatidylserine (PS) externalization, and mitochondrial transmembrane potential (MTP) were analyzed by flow cytometry. DNA damage was analyzed by electrophoresis and immunostaining. ELISA was used to evaluate the caspase-3/-8/-9 activation. Finally, Western blotting was applied for detecting the expressions of apoptosis-related proteins. RESULTS: Morphological changes and reduced viability of GFX-treated SFs demonstrated that GFX above 0.009375% had cytotoxicity to SFs with dependence of concentration and time. GFX-treating cells also showed G1 phase arrest, increased membrane permeability, PS externalization and DNA damage, which indicated that GFX induced apoptosis of SFs. Additionally, GFX could activate the caspase-8, caspase-9, and caspase-3, induce MTP disruption, downregulate B-cell leukemia-2 (Bcl-2) and B-cell leukemia-XL (Bcl-XL), and upregulate Bcl-2 assaciated X protein (Bax), Bcl-2-associated death promoter (Bad), Bcl-2 interacting domain (Bid) and cytoplasmic cytochrome C in SFs, suggesting that caspase-dependent extrinsic and intrinsic pathways were related to GFX-contributed apoptosis of SFs. CONCLUSION: The cytotoxicity of GFX induces apoptosis of SFs through triggering the caspase-dependent extrinsic and intrinsic pathways.     

肝癌热休克蛋白—抗原肽复合物的构建及诱导CTL反应的初步研究

目的：研究体外构建热休克蛋白-抗原肽复合的方法,观察其在体外的抗肿瘤作用。方法：用经43℃热处理1小时的人肝细胞悬液,经过裂解液裂解,60%-80%饱和硫酸铵沉淀,用SephadexG-100柱制备,取分子量为70KD组份,Westen blot进行性质鉴定。应用多肽解离液处理该组份,SephadexG-25柱过滤获得未结合多肽的蛋白分子,使其在体外与肝癌抗原肽SLIVHLNEV结合,构建成热休克蛋白-抗原肽复合物。应用此复合物树突状细胞,激活同源外周血T淋巴细胞产生肿瘤特异性杀伤T淋巴细胞（CTL）,应用MTT法检测其对T2细胞及肿瘤细胞的杀伤活性。结果：所得蛋白经电泳及Western blot进行蛋白分子量及性质鉴定为热休克蛋白70。SephadexG-25柱双分离法证实应用上述方法成功构建了肝癌热休克蛋白70-抗原肽复合物,用该复合物负荷树突状细胞在体外可以诱导出较强的肝癌抗原肽物特异性CTL,可以杀伤负荷有该肽的T2细胞及递呈该肽的肿瘤细胞系。结论：体外构建的热休克蛋白-抗原肽复合物可以增强抗原肽诱导CTL反应能力,热休克蛋白是良好的T细胞免疫佐剂,有可能在肿瘤疫苗治疗中发挥重要作用。     

“保胎Ⅰ冲剂”提高反复自然流产患者免疫功能的临床观察

为探讨中药对反复自然流产患者的免疫调节作用 ,用自制“保胎Ⅰ冲剂”治疗反复自然流产患者 3 6例 ,观察治疗前后患者血清中封闭抗体对配偶外周血T淋巴细胞CD3 、CD4及CD8抗原反应的变化。结果 :治疗后抗CD3 、抗CD8明显升高 ,抗CD4/CD8下降 ;妊娠成功率 91 67%。提示中药对母胎免疫有调节作用 ,且作用安全     

携带靶向沉默LSD1基因表达shRNA慢病毒载体的构建与鉴定

目的:构建慢病毒干扰LSD1表达的载体并鉴定。方法:设计并合成3对针对LSD1基因的shRNA链,退火形成双链,与酶切的质粒连接,转化DH5a菌株,提取质粒,进行酶切鉴定和测序分析。脂质体法转染人胃癌MKN-28细胞,通过荧光倒置显微镜判定转染效率,并通过real time-PCR法检测细胞中LSD1基因的表达水平。结果:经酶切鉴定筛选出的重组质粒测序结果与目的序列相同,重组质粒构建成功;转染胃癌MKN-28细胞后,LSD1基因在mRNA水平的表达降低。结论:成功构建了靶向LSD1基因的shRNA慢病毒载体,并筛选出1种对LSD1基因有显著抑制作用的shRNA。     

三维可视化引导放疗摆位系统的研发及临床应用

目的:开发一种三维可视化技术辅助放疗患者摆位,并对比分析其在乳腺和盆腔放疗中与传统摆位方法的差异。方法:选取2020年6月至2021年4月常州第二人民医院40例放疗患者作为研究对象,其中乳腺、盆腔患者各20例。利用患者定位CT数据进行三维可视化重建,并将三维可视化模型与真实治疗环境融合,通过交互操作使得三维可视化模型位...     

威海地区健康人群血尿酸浓度的调查

目的了解本地区健康人群血尿酸浓度,及正常人群存在的无症状性高、低尿酸血症群体比例。方法用尿酸氧化酶法,检测了624份健康人血清样品。结果男性<10岁为163.2±50.0umol/L,11~20岁为253.2±65.3umol/L,中青年(21~50)为232.5±73.2umol/L,>51岁组为231.6±69.3umol/L。女性<10岁组为140.6±49.7umol/L,11~20岁组为174.3±62.2umol/L,中青年(21~50)为177.0±58.1umol/L,>51岁组为214.4±69.4umol/L。同年龄段男女间比较:在<10岁,无显著性差异(p>0.05);在11~50岁,相差均非常显著(p<0.001);从51岁以后,差异无显著性(p>0.05)。男性UA在l~10组水平较低,与其它组比较,差异显著(P<0.001),11~20组与41~50、51~60组相比差异显著(p<0.05)。女性UA在1~10年龄段水平较低,与其它组比较,差异显著(P<0.001),31~40水平最低,41岁以后呈增高趋势。61岁以后比50岁以前水平增高,差异有显著性(p<0.05)。结论诊断高、低尿酸血症各地区最好建立自己的血清尿酸参考范围。     

Subset analysis of safety and efficacy in asian patients treated with RRx-001 across three clinical trials

RRx-001, a CD47 antagonist via its inhibition of MYC and the γ-subtype of the peroxisome proliferator-activated receptor (PPAR) has been associated to date with minimal toxicity. The aim of this post-hoc analysis was to evaluate the toxicity and efficacy of RRx-001 in Asian patients since RRx-001, in the context of multiple Phase 3 studies, will be administered in China and Chinese territories as well as potentially throughout the rest of Asia. Patients received 4 mg of RRx-001 in three different antitumor clinical trials with chemotherapy and/or radiation and a retrospective subset efficacy and toxicity analysis was conducted for patients with Asian ancestry in comparison to patients with other ethnic backgrounds. The toxicity and efficacy data from these studies were similar between Asians and the rest of the treated patients. While the sample sizes are too small to draw definitive conclusions, at a dose of 4 mg, when RRx-001 is combined with chemotherapy, no apparent differences in terms of safety and efficacy are observed in cancer patients with Asian ancestry.     

Effects of 10-Day Complete Fasting on Physiological Homeostasis,Nutrition and Health Markers in Male Adults

Fasting shows great potential in preventing chronic diseases and has to be surmounted under some extraordinary circumstances. This study aimed to investigate the safety, time effects of metabolic homeostasis and health indexes during prolonged fasting. Thirteen participants were recruited to conduct a 10-day complete fasting (CF) in a controlled health research building under medical supervision including 3-day Baseline (BL), 10-day CF, 4-day calorie restriction (CR) and 5-day full recovery (FR). Body healthy status was assessed by surveying pulse, blood pressure, body weight (BW), blood glucose and ketones, body composition and nutritional and biochemistry indexes at different times. BW declined about 7.28 kg (−9.8%) after 10-day CF, accompanied by increased pulse and decreased systolic blood pressure, but there were no changes to the myocardial enzymogram. Body composition analysis showed fat mass was constantly lost, but lean mass could recover after CR. The energy substrate switch from glucose to ketone occurred and formed a stable dynamic balance between 3–6 days of CF. The lipid metabolism presented increased total cholesterol, LDL-C, ApoA1 and almost no changes to TG and HDL-C. Prolonged CF did not influence liver function, but induced a slight decrease of kidney function. The interesting results came from the marked increase of lipid-soluble vitamins and a significant decrease of sodium and chlorine. Adults could well tol-erate a 10-day CF. A new metabolic homeostasis was achieved. No vitamins but NaCl supplement should be considered. These findings provide evidence to design a new fasting strategy for clinical practice.     

A variant in microRNA-124 is involved in the control of neural cell apoptosis and associated with recovery after spinal cord injury (SCI)

IntroductionIn this study, we aimed to investigate the role of rs531564 and the underlying signaling pathways.MethodsFive hundred and twenty-eight spinal cord injury (SCI) patients were genotyped for the analysis of the effect of rs531564 upon the miR-124 expression.ResultsBy luciferase assays, we validated Bcl-2-like protein 11 (BIM) as a target gene of miR-124 with a negative regulatory relationship between them. We also observed that miR-124 suppressed cell viability and accelerated cell apoptosis.Conclusionsrs531564 could affect the expression of BIM by reducing the expression of miR-124, and it could be a bio-marker for the length of recovery after SCI.