云南红豆杉中四个新紫杉烷类四环二萜成分的分离和鉴定

从云南红豆杉(Taxus yunnanensis ChengetL.K.Fu)树皮的二氯甲烷部分又分离得到四个新紫杉烷类四环二萜化合物,分别命名为taxayuntin A,B,C和D。应用¹HNMR,¹³CNMR,¹H-¹HCOSY,¹³C-¹HCOSY及¹³C-¹HCOLOC等方法进行结构测定,证明它们都有5/7/6三环稠合的基本骨架,并在C₄和C₅上连有环氧丙烷。     

云南红豆杉化学成分的研究IV：二个新紫杉烷类三环二萜成分的分离和鉴定

在继续从云南红豆杉（ＴａｓｕｓｙｕｎｎａｎｅｎｓｉｓＣｈｅｎｇｅｔＬ．Ｋ．Ｆｕ）树皮中寻找抗肿瘤活性成分的研究中，又分离出７个紫杉烷类二萜化合物，经光谱解析（ＭＳ，１ＨＮＭＲ，１Ｈ－１ＨＣＯＳＹ，１３ＣＮＭＲ，１３Ｃ－１ＨＣＯＳＹａｎｄ１３Ｃ－１ＨＣＯＬＯＣ），鉴定其中５个为已知化合物：７－ｅｐｉ－１０－ｄｅａｃｅｔｙｌｔａｘｏｌ（Ｉ），７－ｅｐｉ－１０－ｄｅａｃｅｔｙｌｃｅｐｈａｌｏｍａｎｎｉｎｅ（ＩＩ），１０－ｄｅａｃｅｔｙｌｔａｘｏｌ（ＩＩＩ），１０－ｄｅａｃｅｔｙｌｃｅｐｈａｌｏｍａｎｎｉｎｅ（ＩＶ）和１０－ｄｅａｃｅｔｙｌｂａｃｃａｔｉｎＩＩＩ（ＶＩＩ）；２个新化合物是１３（２′，３′－ｄｉｈｙｄｒｏｘｙ－３′－ｐｈｅｎｙｌ）－ｐｒｏｐｉｏｎｙｌｂａｃｃａｔｉｎ，ＩＩＩ（Ｖ）和９－ｄｅｏｘｏ－９α－ｈｙｄｒｏｘｙｔａｘｏｌ（ＶＩ），分别命名为云南红豆杉醇（ｙｕｎｎａｎｘｏｌ）和云南红豆杉胺（ｙｕｎｎａｎｘａｍｉｎｅ）。     

格列吡嗪胶囊的药代动力学及生物利用度研究

格列吡嗪胶囊的药代动力学及生物利用度研究陈秋潮，杨春芹，赵彩虹，马永贵，李雪宁，陈伟力（上海医科大学中山医院药剂科２０００３２）格列吡嗪（ｇｌｉｐｉｚｉｄｅ，简称Ｇ）属新的磺酰脲类降糖药，主要用于Ⅱ型（非胰岛素依赖型）糖尿病。其药理作用主要是直接刺激...     

东北红豆杉枝叶化学成分的研究

东北红豆杉(Taxus cuspidata SibeetZucc)枝叶乙醇提取物的二氯甲烷溶部分显示有较强的抗肿瘤活性,从这部分中已分离出十二个紫杉烷类二萜化合物,经理化常数测定和光谱解析证明其中十个为已知化合物taxinine(I),taxinineA(II),taxinineB(III),taxacin(V),taxagifine(VI),taxol(VII),cephalomannine(VIII),taxinineM(IX),10-deacetyl baccatinIII(X)和taxayuntin(XI),另二个化合物为新成分,分别命名为10-deacetyl taxinineB(IV)和taxacustin(XII),其中化合物VII,VIII,IX,X和XI均为首次从该植物枝叶中分离得到。     

鼠颚毛厉螨和厩真厉螨自然感染和叮刺传播流行性出血热病毒的研究

从EHF疫区鼠窝采集鼠颚毛厉螨和厩真厉螨,饥饿16天后叮咬健康乳小鼠,在传代乳鼠以IFAT检查,有特异性荧光颗粒,并对第四代鼠肺进行鉴定,证明厩真厉螨和首次证明鼠颚毛厉螨自然感染、叮刺传播EHFV。     

Prognostic prediction of lung adenocarcinoma by integrative analysis of RHOH expression and methylation

Background and objective

The development of epigenetics holds great promise for diagnosis and treatment of lung adenocarcinoma (LUAD). The purpose of this work was to analyze the correlation between Ras Homolog Gene Family Member H (RHOH) expression and methylation in patients with LUAD and its association with survival.

Methods

Data related to gene expression, DNA methylation, and clinical features of LUAD from The Cancer Genome Atlas (TCGA) database were analyzed. A total of 50 patients were included in verification group. The methylation level of RHOH in verification group was detected by bisulfite amplicon sequencing.

Results

The RHOH methylation level in TCGA cohort was significantly and negatively correlated with its expression level (Cor = −0.5, p = 2.687e−33). Patients with hypermethylation and low expression of RHOH had significantly worse prognosis than patients with hypomethylation and low expression of RHOH (TCGA: p = 0.004; validation cohort: p = 0.006, HR: 4.740, 95% CI: 1.567–14.340).

Conclusion

Our research revealed that RHOH may prove to be a new potential prognostic predictor for LUAD patients.