The circular RNA circSlc7a11 promotes bone cancer pain pathogenesis in rats by modulating LLC-WRC 256 cell proliferation and apoptosis

Molecular and Cellular Biochemistry - Treatment of bone cancer pain (BCP) caused by bone metastasis in advanced cancers remains a challenge in clinical oncology, and the underlying mechanisms of...     

辣椒碱对小菜蛾的驱避活性及其体内谷胱甘肽-S-转移酶和Na+，K+-ATP酶活性的影响

采用常规生测方法和酶活力测定方法,初步研究了辣椒碱对小菜蛾Plutella xylostella L.的产卵忌避和拒食作用,及其对小菜蛾体内谷胱甘肽-S-转移酶、Na⁺,K⁺-ATP酶活性的影响,以期阐明辣椒碱对害虫的作用机制。结果表明,辣椒碱对小菜蛾表现出较强的产卵忌避活性和拒食活性。在6.25×10⁴ mg/L浓度下,处理24 h辣椒碱对小菜蛾的非选择性产卵忌避率达96.55%,选择性产卵忌避率为84.30%;在相同浓度下,处理48 h辣椒碱对小菜蛾的非选择性拒食率达81.47%,选择性拒食率为69.69%。 另外,经1.25×10⁵ mg/L辣椒碱不同时间处理后,小菜蛾体内的谷胱甘肽-S-转移酶酶活力和Na⁺,K⁺-ATP酶活力与对照相比均产生了波动,处理18 h时小菜蛾体内GSTs活力最高,为152.01 U·mg^-1pro·min^-1,处理1 h时小菜蛾体内Na⁺,K⁺-ATP酶活力最高,为19.99 U·mg^-1pro·min^-1。结果说明辣椒碱能够影响小菜蛾产卵和取食行为,并且对其体内的酶系也产生了影响。     

鸭跖草叶点霉粗毒素的提取方法和产毒条件的研究

以石油醚、乙酸乙酯、四氯化碳三种极性不同的溶剂对鸭跖草叶点霉病原菌的菌丝和培养液进行萃取,获取粗毒素。结果表明,叶点霉菌产生的毒素既有胞外毒素,又有胞内毒素,且用极性中等的乙酸乙酯萃取效果最好。大豆培养基和PSK分别是适合菌株生长和毒素分泌的固体培养基和液体培养基。确定有利于叶点霉产毒的温度为32℃、培养时间为14d、培养方式为150r/min振荡培养。     

鸭跖草叶点霉粗毒素的提取方法和产条件的研究

以石油醚、乙酸乙酯、四氯化碳三种极性不同的溶剂对鸭跖草叶点霉病原菌的菌丝和培养液进行萃取,获取粗毒素。结果表明,叶点霉菌产生的毒素既有胞外毒素,又有胞内毒素,且用极性中等的乙酸乙酯萃取效果最好。大豆培养基和PSK分别是适合菌株生长和毒素分泌的固体培养基和液体培养基。确定有利于叶点霉产毒的温度为32℃、培养时间为14d、培养方式为150r/min振荡培养。     

Connexin 43 Mediates CXCL12 Production from Spinal Dorsal Horn to Maintain Bone Cancer Pain in Rats

Neurochemical Research - Tumor metastasis to bone can subsequently lead to bone cancer pain (BCP). Currently, BCP is difficult to conquer due to a poor understanding of the potential mechanisms....     

Pigment Epithelial-derived Factor (PEDF)-triggered Lung Cancer Cell Apoptosis Relies on p53 Protein-driven Fas Ligand (Fas-L) Up-regulation and Fas Protein Cell Surface Translocation

Pigment epithelium-derived factor (PEDF), a potent antiangiogenesis agent, has recently attracted attention for targeting tumor cells in several types of tumors. However, less is known about the apoptosis-inducing effect of PEDF on human lung cancer cells and the underlying molecular events. Here we report that PEDF has a growth-suppressive and proapoptotic effect on lung cancer xenografts. Accordingly, in vitro, PEDF apparently induced apoptosis in A549 and Calu-3 cells, predominantly via the Fas-L/Fas death signaling pathway. Interestingly, A549 and Calu-3 cells are insensitive to the Fas-L/Fas apoptosis pathway because of the low level of cell surface Fas. Our results revealed that, in addition to the enhancement of Fas-L expression, PEDF increased the sensitivity of A549 and Calu-3 cells to Fas-L-mediated apoptosis by triggering the translocation of Fas protein to the plasma membrane in a p53- and FAP-1-dependent manner. Similarly, the up-regulation of Fas-L by PEDF was also mediated by p53. Furthermore, peroxisome proliferator-activated receptor γ was determined to be the upstream regulator of p53. Together, these findings uncover a novel mechanism of tumor cell apoptosis induced by PEDF and provide a potential therapeutic strategy for tumors that are insensitive to Fas-L/Fas-dependent apoptosis because of a low level of cell surface Fas.