核转录因子-κB诱导肿瘤坏死因子-α在肝肺综合征大鼠肺血管内巨噬细胞中的表达及吡咯醛二硫氨基甲酸对其表达的影响

目的 探讨核转录因子-κB(NF-κB)及肿瘤坏死因子-α(TNF-α)在大鼠肺血管内巨噬细胞(PIM)内的表达及吡咯醛二硫氨基甲酸(PDTC)对其表达的影响.方法 SD大鼠随机分4组:对照组、PDTC对照组、CCI4组、CCI4+PDTC组.取动脉血作血气分析,静脉血测内毒素和肝功能.取肠系膜淋巴结作细菌培养.应用免疫组化方法 观察PIM的粘附、聚集情况,以及TNF-α和NF-κB的蛋白表达和定位.非放射性凝胶电泳阻滞实验(EMSA)检测NF-κB活性,SYBR Green I实时定量PCR方法 检测肺组织中TNF-α的mRNA表达.结果 CCl4组发展成肝肺综合征(HPS)模型,表现为PaO2、PaCO2降低和肺泡一动脉血氧分压(A-aDO2)升高,肝功能异常,内毒素血症.CCl4组肠系膜淋巴结培养阳性率为62.5%(5/8),与CCl4+PDTC组的66.7%(6/9)比较差异无统计学意义(P>0.05).CCl4组超过10个巨噬细胞的血管为60.8%(292/480),而CCl4+PDTC组仅为19.6%(106/540),两组比较差异有统计学意义(P<0.01).对照组和PDTC对照组中肺血管内无巨噬细胞聚集.免疫组化染色NF-κB和TNF-α蛋白均在CCl4组的PIM中表达.CCl4组的NF-κB活性和TNF-α的mRNA表达明显高于对照组、PDTC对照组和CCl4+PDTC组(均P<0.05).结论 NF-κB诱导PIM内TNF-α表达在HPS中发挥重要作用,PDTC通过抑制PIM中NF-κB的活性,降低PIM活性以及其中TNF-α表达,从而改善HPS.     

α－干扰素加冷冻治疗慢性宫颈炎疗效分析

精制人白细胞α－干扰素治疗妇科宫颈糜烂４１３３例，Ｉ°１７９４例，治愈率８５．４５％，有效率９８．２２％；Ⅱ°２１４３例，治愈率７９．６１％，有效率９３．２３％；Ⅲ°１９６例，治愈率３５．７１％，有效率５３．０６％。α－干扰素对轻度及中度糜烂疗效显著，对重度疗效较差。α－干扰素对轻度及中度疗效与冷冻、激光、微波、电的术疗效无显著差异，且副作用少，对重度糜烂采用α－干扰素和冷冻联合治疗疗效明显。     

Resveratrol inhibits hypoxia-induced metastasis potential enhancement by restricting hypoxia-induced factor-1α expression in colon carcinoma cells

Resveratrol has been shown recently to exhibit antimetastatic effect on various human solid tumors. However, the possible molecular mechanism for its antimetastatic action needs to be elucidated. In this study, we investigated the effect of resveratrol on metastasis potential of colon carcinoma cells under normoxia and hypoxia in vitro. These results showed that, resveratrol can restrict the migration, adhesion, invasion and MMP-9 and MMP-2 secretion in Lovo cells cultured under normoxia and hypoxia. Hypoxia and iron chelator 2,2′-dipyridyl treatment can stimulate the invasion and migration enhancement of Lovo cells, while resveratrol exhibited substantial resistance on the metastasis potential stimulation by inhibiting the mRNA expression of VEGF and MMP-9 in colon carcinoma cells under normoxia and hypoxia, reducing HIF-1α protein expression under hypoxia. Also, iron chelator 2,2′-dipyridyl treatment showed approximately the same effect on metastasis potential as Lovo cells cultured under hypoxia. These data demonstrated that, the antimetastatic effect of resveratrol under hypoxia were associated with the restriction of HIF-1α protein expression and stabilization, which could be a promising drug target for resveratrol in the development of an effective chemopreventive and anticancer therapy in human tumors.     

High levels of soluble GPR56/ADGRG1 are associated with positive rheumatoid factor and elevated tumor necrosis factor in patients with rheumatoid arthritis

Background

GPR56/ADGRG1 is a member of the adhesion-class G protein-coupled receptor (aGPCR) family important in brain development, oncogenesis and tumor metastasis. Like other aGPCRs, GPR56 is cleaved at the GPCR proteolysis site (GPS) motif into an N-terminal fragment (NTF) and a C-terminal fragment (CTF). Existence of soluble GPR56 (sGPR56) has been shown in vitro, however the underlying mechanism and its pathophysiologic role remains undetermined.

An algorithm for the classification of mRNA patterns in eosinophilic esophagitis: Integration of machine learning

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Myalgic Encephalomyelitis/Chronic Fatigue Syndrome – Evidence for an autoimmune disease

Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a frequent and severe chronic disease drastically impairing life quality. The underlying pathomechanism is incompletely understood yet but there is convincing evidence that in at least a subset of patients ME/CFS has an autoimmune etiology. In this review, we will discuss current autoimmune aspects for ME/CFS. Immune dysregulation in ME/CFS has been frequently described including changes in cytokine profiles and immunoglobulin levels, T- and B-cell phenotype and a decrease of natural killer cell cytotoxicity. Moreover, autoantibodies against various antigens including neurotransmitter receptors have been recently identified in ME/CFS individuals by several groups. Consistently, clinical trials from Norway have shown that B-cell depletion with rituximab results in clinical benefits in about half of ME/CFS patients. Furthermore, recent studies have provided evidence for severe metabolic disturbances presumably mediated by serum autoantibodies in ME/CFS. Therefore, further efforts are required to delineate the role of autoantibodies in the onset and pathomechanisms of ME/CFS in order to better understand and properly treat this disease.     

α_1-抗胰蛋白酶活性测定方法及其影响因素的研究

目的研究用发色底物法测定α1-AT生物活性时,以正常人混合血浆为参考标准的血浆稀释度范围和测定的影响因素。方法采用酶标仪测定抗胰蛋白酶与过量的胰蛋白酶反应后,剩余的胰蛋白酶与BAPNA发色反应的OD值(405nm),观察时间和温度对反应的影响,优化正常人混合血浆(30人份)稀释度范围,建立并验证血浆标准曲线,同时观察几种物质对测定的影响。结果通过优化实验,血浆的稀释倍数在1/50~1/100之间有良好的线性;PEG4000、蔗糖、Tween80/TNBP(S/D)、辛酸钠等对活性测定无明显影响,而枸橼酸钠浓度>0.125mol/L,α1-AT生物活性测定结果偏高约20%。结论以正常人混合血浆为参考标准品,用酶标仪测定α1-AT的生物活性,快速、准确,方法稳定可靠,α1-AT制备过程中常用的几种物质,除枸橼酸钠外,对其活性测定均无影响。