摘要：本文设计合成了多条全2?-F/OMe修饰的抗肝癌siRNA,并在细胞水平进行活性评价,探究2?-F/OMe修饰的位置差异对siRNA活性的影响。使用K&A DNA/RNA H-8合成仪合成全2?-F/OMe修饰siRNA,利用中性胞苷脂材DNCA混合阳离子脂材CLD包载递送siRNA入胞。通过RT-qPCR实验检测Huh-7和HepG2细胞的靶基因沉默活性, CCK-8实验检测Huh-7和HepG2细胞增殖活力, RNA结合蛋白免疫沉淀及RT-qPCR实验检测siRNA载入Ago2蛋白的情况,流式细胞术检测药物摄取和细胞凋亡, Western blot实验检测PLK1蛋白的表达。部分全2?-F/OMe修饰siRNA增强了与Ago2蛋白的结合,进而增强了基因沉默活性及肝癌细胞增殖抑制活性。此外,多数siRNA修饰物制剂的Huh-7细胞摄取率提高,更大幅度下调PLK1蛋白,诱导更多Huh-7细胞凋亡,其中siPLK1A3最优。以上结果为进一步研究siRNA修饰模式及研发抗肝癌新型制剂提供了工作基础。

摘要：2021年11月15日,北京大学药学院天然药物及仿生药物国家重点实验室刘涛研究员团队在化学生物学领域顶级期刊Nature Chemical Biology (IF=15.0)在线发表了最新研究成果"Genetic code expanded cell-based therapy for treating diabetes in mice"。近年来,随着CAR-T细胞的成功上市,利用合成生物学设计的细胞治疗方式已显现出广阔的疾病治疗前景。

摘要：A series of new cyclic phosphoramidate mustard-quinazoline conjugates were designed and synthesized based on the drug candidate EMB-3, a multi-target-directed ligand against tumor cells, and their anti-tumor activities were evaluated on breast cancer and lung cancer cells. Compound 6d exhibited the best anti-tumor performance with IC5o = 0.6 pM （8-fold of EMB-3） on BT474 breast tumor cells. Compound 6d inhibited epidermal growth factor receptor （EGFIL biomarker for NSCLC） and human epidermal growth factor 2 （HER2, biomarker for breast cancer） with IC50 of 18 nM and 78 nM, respectively. The preliminary pharmacokinetic study revealed that 6d was more stable than EMB-3 during the in vivo metabolism. A single dose per os （PO） administration of 6d in rat model （10 mg/kg） resulted in a moderate tl/2 of 1.7 h. These results indicated that compound 6d was a potential lead compound for the treatment of breast cancer.

摘要：Two photolabile amphiphilic supramolecules were designed and synthesized with mono-dendrite and tri-dendrite, which can reversibly self-assemble to spheroid and wedge-shaped nanoparticles. With multiple branches of terminal amine labeled PEG, these nanoparticles can associate with a negatively charged oligonucleotide and their usage for oligonucleotide delivery was evaluated. Oligonucleotide/nanoparticle complex containing tri-dendrite can efficiently deliver oligonucleotide into cells via endocytosis, while the complex containing mono-dendrite almost lost their ability to deliver oligonucleotide. Further light activation triggered the dissociation of tri-dendrite supramolecular assembly via 1,4- and 1,6-quinone-methide rearrangement, leading to the efficient unpacking of the oligonucleotide in cells.

摘要：结合曲氨南(Aztreonam)、奥美拉唑(Omeprazole)与一种席夫碱对含氮化合物在核磁共振(NMR)测试中的某些特性进行了研究.结果表明,14N四偶极矩、分子间氢键以及分子间质子转移导致的异构,是影响含氮化合物核磁特性的主要因素.这些因素虽然在NMR的实验设计与谱图分析方面是无法避免的,但却能为结构解析以及其他化学研究方面提供一定的有趣的信息.

摘要：CD38是一种多功能的跨膜糖蛋白,其酶催化活性与哺乳动物体内多种疾病的发生和发展密切相关。本文以CD38抑制剂H2为先导结构,将其吲哚母环替换为嘌呤环,设计合成了33个嘌呤衍生物,活性评价结果显示化合物20、38表现出与先导结构相当的抗CD38 NADase活性。研究结果揭示嘌呤6位小取代基对化合物活性的影响不大,嘌呤2-位是否有苯丙酰基取代对化合物与CD38的结合模式有重要影响。

摘要：α7烟碱型乙酰胆碱受体(α7 nAChR)是一种配体门控型离子通道,在认知、学习和记忆方面具有关键作用,α7 nAChR功能下降与神经精神疾病认知障碍相关。本研究通过在中氮茚的不同位置引入多种类型的取代基,设计合成了一系列中氮茚类衍生物,并用双电极电压钳方法评价了化合物的激动活性。研究发现了16c(EC_(50)为1.60±0.19μmol·L^(-1),E_(max)为69.0%±2.8%)和17b(EC_(50)为2.74±0.74μmol·L^(-1),E_(max)为81.1%±9.3%)两个活性较高的化合物。构效关系研究表明,在中氮茚的6-位和8-位引入小的疏水基团分别能够提高化合物的效价和最大效应。

摘要：设计和合成了病毒唑的光探针:5-叠氮基-1-1-(β-呋喃核糖基)-1,2,4-三唑-3-酰胺(1)和3-叠氨-1-(β-呋喃核糖基)-1,2,4-三唑-5-酰胺(2),并以光探针1的前体化合物5-叠氮基-1-(2,3,5-三乙酰基-β-呋喃核糖基)-1,2,4-三唑-3-酰甲酯(3)为模型化合物,初步研究了叠氮基-1,2,4-三唑的光化学性质。结果表明:在不同溶剂(环戊烷和甲醇)中,化合物3在光辐射下得到不同光化学产物,其光化学反应速度快,主要产物明显,且对碳-氢键的插入能力要比插入氧-氢键的强。

摘要：Cisplatin （CDDP）, a platinum-containing drug, has been widely used in the therapy of many types of cancers today. However, the side effects of CDDP have limited its clinical application. Butaselen （BS）, a TrxR inhibitor designed by our group, has shown anti-tumor effects in vivo and in vitro. In this study, we investigated the combinatory effects of BS and CDDP on BEL-7402 cells, LoVo cells, HeLa cells and A549 cells. We observed synergistic effects when BS and CDDP were used in combination, especially in BEL-7402 cells. Apoptosis analysis also revealed that the combination treatment of BS and CDDP （1：1） for 48 h induced higher apoptotic effects in BEL-7402 cells. A further study in BEL-7402 cells showed that the synergistic effect might be mediated by the sharp reduction of ratio of Bcl-2/Bax protein. Taken together, the combination of CDDP and BS might be of great potential for chemotherapy.

摘要：HIV-1 reverse transcriptase（RT） inhibitors are major components of HAART（highly active antiviral therapy）. The S-DABOs（dihydro-alkylthio-benzyl-oxopyrimidines） series and their similar skeletons have exhibited preferable activities to inhibit HIV-1 RT. In the present study, we generated field-based QSAR models using common structure alignment, which was characterized by Gaussian steric, electrostatic, hydrophobic, hydrogen bond donor, hydrogen bond acceptor and aromatic ring fields（R2 = 0.8421, RCV2 = 0.5949 for the training set, Q2 = 0.5486, Pearson-r = 0.7460 for the test set）. Docking, pocket surface and contour map analyses were carried out. Key pharmacophore features were investigated, including（i） π-π interaction with residue Tyr181, Tyr188 and Trp229, σ-π interaction with His236,（ii） hydrogen bond with residue Lys101 and halogen bond with residue Tyr188. The docking analysis and field-based QSAR models could provide reasonable guidance in the rational design of potent HIV-1 RT inhibitors.