Expression of Claudin-2 in human esophageal squamous cell carcinoma tissues and its effect on the malignant biological behaviors of KYSE-450 cells / 中国肿瘤生物治疗杂志

@#目的：分析Claudin-2蛋白在食管鳞癌（esophageal squamous cell carcinomas，ESCC）组织中的表达及其与患者临床病理特征、5年生存率的关系，探索其对ESCC细胞KYSE450的增殖、迁移和侵袭的影响。方法：选取河南省肿瘤医院2010至2013年间初治的ESCC患者手术切除肿瘤组织52例及其中20例对应的癌旁组织标本，采用免疫组化和WB法检测Claudin-2的表达并分析其与患者临床病理特征和5年生存率的关系。WB法检测ESCC细胞（KYSE450、KYSE150、KYSE510、KYSE140）和人永生化食管上皮细胞SHEE中Claudin-2的表达，构建Claudin-2 shRNA慢病毒载体并转染KYSE450细胞构建敲低Claudin-2表达的细胞系，进一步通过克隆形成实验、细胞划痕实验及Transwell实验检测敲低Claudin-2对KYSE450细胞增殖、迁移和侵袭的影响。结果：ESCC组织中Claudin-2阳性率显著高于癌旁组织（P<0.05），ESCC组织中Claudin-2的表达与淋巴结转移有关（P<0.05）。Claudin-2表达阳性患者5年生存率显著低于阴性者（P<0.05）。成功构建敲低Claudin-2表达的KYSE450细胞系。sh-Claudin-2组细胞的克隆形成数、伤口愈合率和侵袭细胞数均显著低于sh-NT组和对照组（P<0.05）。结论：ESCC组织中Claudin-2的表达高于癌旁组织，且与患者5年生存率呈负相关，Claudin-2能够增强KYSE450细胞的增殖、迁移和侵袭能力。

Sulforaphene induces apoptosis and inhibits the invasion of esophageal cancer cells through MSK2/CREB/Bcl-2 and cadherin pathway in vivo and in vitro.

BACKGROUND: As a novel type of isothiocyanate derived from radish seeds from cruciferous vegetables, sulforaphene (SFE, 4-methylsufinyl-3-butenyl isothiocyanate) has various important biological effects, such as anti-oxidative and anti-bacterial effects. Recently, sulforaphene has attracted increasing attention for its anti-tumor effects and its ability to suppress the development of multiple tumors through different regulatory mechanisms. However, it has not yet been widely investigated for the treatment of esophageal cancer. METHODS: We observed an increased apoptosis in esophageal cancer cells on sulforaphene treatment through flow cytometry (FCM) analysis and transmission electron microscopy (TEM). Through mass spectrometry (MS) analysis, we further detected global changes in the proteomes and phosphoproteomes of esophageal cancer cells on sulforaphene treatment. The molecular mechanism of sulforaphene was verified by western blot,the effect and mechanism of SFE on esophageal cancer was further verified by patient-derived xenograft mouse model. RESULTS: We identified multiple cellular processes that were changed after sulforaphene treatment by proteomics. We found that sulforaphene could repress the phosphorylation of CREB through MSK2, leading to suppression of Bcl-2 and further promoted cell apoptosis. Additionally, we confirmed that sulforaphene induces tumor cell apoptosis in mice. Interestingly, we also observed the obvious inhibition of cell migration and invasion caused by sulforaphene treatment by inhibiting the expression of cadherin, indicating the complex effects of sulforaphene on the development of esophageal cancer. CONCLUSIONS: Our data demonstrated that sulforaphene induced cell apoptosis and inhibits the invasion of esophageal cancer through a mechanism involving the inhibition of the MSK2-CREB-Bcl2 and cadherin pathway. Sulforaphene could therefore serve as a promising anti-tumor drug for the treatment of esophageal cancer.

[Temporal pattern of arthropod community on cultivated alfalfa grassland].

The variation of species and diversities of the arthropod community on cultivated alfalfa grassland was investigated and studied. Principal component analysis and optimal sorting method were used to study its temporal patterns. The results showed that the difference and regularity of species richness, and the diversity and evenness of the arthropod community at different time were obvious. The numbers of the species of insect pests and their natural enemies were the most in the last ten days of June, but the peak period of individual numbers of the natural enemies was later than that of insect pests. The main factors and temporal patterns of arthropod community in the course of seasons were obvious. Based on the results, the temporal patterns of arthropod community on cultivated alfalfa grassland could be divided into four stages: before the first ten days of May, the middle ten days of May to the first ten days of June, the middle ten days of June to the middle ten days of July, and after the middle ten days of July. Considering the climatic and phenological development, the characteristics of the pests and the natural enemies occurring in each stage were analyzed, and the corresponding management tactics were discussed.