通经定晕丸阻断颈椎病大鼠NF-κB激活MCP-1/CCR2通路及TNF-α及IL-1β、IL-6表达的研究

目的:研究通经定晕丸阻断颈椎病大鼠核因子-κB(NF-κB)激活单核细胞趋化蛋白-1(MCP-1)/趋化因子受体-2(CCR2)通路及肿瘤坏死因子-α(TNF-α)、白介素-1β(IL-1β)、白介素-6(IL-6)表达的影响。方法:用手术的方法制作颈椎病大鼠模型,用通经定晕丸(5.0和10.0 g/kg)和颈复康冲剂(0.84 g/kg)灌胃给药,每天1次,连续4周,每天观察实验大鼠一般状况。4周后检测,腹主动脉取血,进行血液黏度,血液中TNF-α、IL-1β和IL-6含量分析;取颈椎椎间盘进行组织形态学分析;实时定量PCR检测颈椎椎间盘组织中MCP-1和CCR2的mRNA表达,Western blot检测椎间盘组织中NF-κBp65蛋白表达。结果: 通经定晕丸(5.0和10.0 g/kg)和颈复康冲剂(0.84 g/kg)可显著改善颈椎病模型大鼠的一般状况,降低血液低切黏度值、中切黏度值、高切黏度值,促炎因子TNF-α、IL-1β和IL-6含量及椎间盘组织中MCP-1、CCR2和NF-κBp65的mRNA和蛋白表达(P<0.05或P<0.01),减轻促炎因子对椎间盘造成的损伤,降低颈椎间盘高度和退变程度,降低纤维环裂隙、髓核、细胞数量、软骨厚度,其中以通经定晕丸10.0 g/kg剂量组作用效果更为显著。结论:通经定晕丸对颈椎病模型大鼠具有较好的治疗的作用,其作用机制与降低血液黏度,抑制MCP-1/CCR2信号通路激活、NF-κB活化及TNF-α、IL-1β和IL-6的生成相关。     

重整拔头油送气分装置生产发泡剂的研究

受2013年轻质C5征收消费税的影响,轻质C5售价比石脑油还低,将导致效益流失5000多万元/年,通过将重整拔头油送气分装置生产高附加值发泡剂产品出售,既可避免效益流失,还可创效5000多万元/年。     

Locally Trapping the C‐C Chemokine Receptor Type 7 by Gene Delivery Nanoparticle Inhibits Lymphatic Metastasis Prior to Tumor Resection

Triple negative breast cancer (TNBC) is the most aggressive breast cancer subtype. Currently, no targeted treatment is available for TNBC, and the most common clinical therapy is tumor resection, which often promotes metastasis risks. Strong evidence suggests that the lymphatic metastasis is mediated by the C‐C chemokine receptor type 7 (CCR7)/C‐C motif chemokine ligand 21 crosstalk between tumor cells and the lymphatic system. It is hypothesized that CCR7 is a key immune modulator in the tumor microenvironment and the local blockade of CCR7 could effectively inhibit TNBC lymphatic metastasis. Accordingly, a plasmid encoding an antagonistic CCR7 affinity protein‐CCR7 trap is delivered by tumor targeting nanoparticles in a highly metastatic 4T1 TNBC mouse model. Results show that CCR7 traps are transiently expressed, locally disrupt the signaling pathways in the tumor site, and efficiently inhibit TNBC lymphatic metastasis, without inducing immunosuppression as observed in systemic therapies using CCR7 monoclonal antibody. Significantly, upon applying CCR7 trap therapy prior to tumor resection, a 4T1 TNBC mouse model shows good prognosis without any further metastasis and relapse. In addition, CCR7 trap therapy efficiently inhibits the lymphatic metastasis in a B16F10 melanoma mouse model, indicating its great potential for various metastatic diseases treatment.     

The Chemokine Receptor CCR3 Is Potentially Involved in the Homing of Prostate Cancer Cells to Bone: Implication of Bone-Marrow Adipocytes

Bone metastasis remains the most frequent and the deadliest complication of prostate cancer (PCa). Mechanisms leading to the homing of tumor cells to bone remain poorly characterized. Role of chemokines in providing navigational cues to migrating cancer cells bearing specific receptors is well established. Bone is an adipocyte-rich organ since 50 to 70% of the adult bone marrow (BM) volume comprise bone marrow adipocytes (BM-Ads), which are likely to produce chemokines within the bone microenvironment. Using in vitro migration assays, we demonstrated that soluble factors released by human primary BM-Ads are able to support the directed migration of PCa cells in a CCR3-dependent manner. In addition, we showed that CCL7, a chemokine previously involved in the CCR3-dependent migration of PCa cells outside of the prostate gland, is released by human BM-Ads. These effects are amplified by obesity and ageing, two clinical conditions known to promote aggressive and metastatic PCa. In human tumors, we found an enrichment of CCR3 in bone metastasis vs. primary tumors at mRNA levels using Oncomine microarray database. In addition, immunohistochemistry experiments demonstrated overexpression of CCR3 in bone versus visceral metastases. These results underline the potential importance of BM-Ads in the bone metastatic process and imply a CCR3/CCL7 axis whose pharmacological interest needs to be evaluated.     

A Versatile Toolkit for Semi-Automated Production of Fluorescent Chemokines to Study CCR7 Expression and Functions

Chemokines guide leukocyte migration in different contexts, including homeostasis, immune surveillance and immunity. The chemokines CCL19 and CCL21 control lymphocyte and dendritic cell migration and homing to lymphoid organs. Thereby they orchestrate adaptive immunity in a chemokine receptor CCR7-dependent manner. Likewise, cancer cells that upregulate CCR7 expression are attracted by these chemokines and metastasize to lymphoid organs. In-depth investigation of CCR7 expression and chemokine-mediated signaling is pivotal to understand their role in health and disease. Appropriate fluorescent probes to track these events are increasingly in demand. Here, we present an approach to cost-effectively produce and fluorescently label CCL19 and CCL21 in a semi-automated process. We established a versatile protocol for the production of recombinant chemokines harboring a small C-terminal S6-tag for efficient and site-specific enzymatic labelling with an inorganic fluorescent dye of choice. We demonstrate that the fluorescently labeled chemokines CCL19-S6^Dy649P1 and CCL21-S6^Dy649P1 retain their full biological function as assessed by their abilities to mobilize intracellular calcium, to recruit β-arrestin to engaged receptors and to attract CCR7-expressing leukocytes. Moreover, we show that CCL19-S6^Dy649P1 serves as powerful reagent to monitor CCR7 internalization by time-lapse confocal video microscopy and to stain CCR7-positive primary human and mouse T cell sub-populations.     

Fucoxanthin Prevents Pancreatic Tumorigenesis in C57BL/6J Mice That Received Allogenic and Orthotopic Transplants of Cancer Cells

Fucoxanthin (Fx) is a marine carotenoid with anti-inflammatory and anti-cancer properties in various animal models of carcinogenesis. However, there is currently no information on the effects of Fx in animal models of pancreatic cancer. We investigated the chemopreventive effects of Fx in C57BL/6J mice that received allogenic and orthotopic transplantations of cancer cells (KMPC44) derived from a pancreatic cancer murine model (Ptf1a^Cre/+; LSL-kras^G12D/+). Using microarray, immunofluorescence, western blot, and siRNA analyses, alterations in cancer-related genes and protein expression were evaluated in pancreatic tumors of Fx-administered mice. Fx administration prevented the adenocarcinoma (ADC) development of pancreatic and parietal peritoneum tissues in a pancreatic cancer murine model, but not the incidence of ADC. Gene and protein expressions showed that the suppression of chemokine (C-C motif) ligand 21 (CCL21)/chemokine receptor 7 (CCR7) axis, its downstream of Rho A, B- and T-lymphocyte attenuator (BTLA), N-cadherin, αSMA, pFAK(Tyr³⁹⁷), and pPaxillin(Tyr³¹) were significantly suppressed in the pancreatic tumors of mice treated with Fx. In addition, Ccr7 knockdown significantly attenuated the growth of KMPC44 cells. These results suggest that Fx is a promising candidate for pancreatic cancer chemoprevention that mediates the suppression of the CCL21/CCR7 axis, BTLA, tumor microenvironment, epithelial mesenchymal transition, and adhesion.     

热力除氧设施在重整预加氢系统中的应用

热力除氧设施在延安石油化工厂120×104 t/a连续重整装置上的成功应用,解决了连续重整装置预加氢反应器压降大的技术瓶颈,避免了预加氢反应器频繁换剂、撇头,为装置的平稳长周期运行奠定了坚实的基础。     

区分有效决策单元的数据包络分析方法

针对DEA模型CCR不能较好区分有效决策单元的不足,采用转化有效决策单元的思想,构造了一个较差的决策单元,给出了能够比较决策单元的数据包络分析方法,经理论分析和实例验证,此法能够评价决策单元的优劣。     

硬质合金组合轧辊在邢钢高线CCR机组的应用

介绍了硬质合金组合轧辊在邢钢高线CCR机组的应用,从轧辊寿命、产品精度等方面探讨了硬质合金组合轧辊在高速线材轧机预精轧机组使用的优势。