重组人干扰素α-2b两步柱色谱分离纯化工艺研究

通过改进柱色谱条件,两步柱色谱分离纯化重组人干扰素α-2b,简化了工艺,缩短了生产流程,纯化倍率达到5.6倍,纯度98%.蛋白比活性1.43×108IU/mg蛋白,活性回收率58%.     

Class I major histocompatibility complex antigen expression on early murine trophoblast and its induction by lymphokines in vitro

The expression of paternal class I and class II major histocompatibility complex (MHC) antigens in cultures of murine ectoplacental cone trophoblast was examined using immunogold labelled antibodies and electron microscopy. Class I MHC antigens could be induced on ectoplacental cone derived trophoblast following exposure to concanavalin A stimulated T cell supernatants. Class I MHC antigens were not detected in untreated trophoblast cultures. Class II MHC antigens were never detected on trophoblast whether treated or untreated. This is the first report of the experimental induction of Class I MHC antigens on a population of normally MHC-negative trophoblast cells.     

Inhibition of homodimerization of Toll-like receptor 4 by curcumin

Toll-like receptors play a key role in sensing microbial components and inducing innate immune responses. Ligand-induced dimerization of TLR4 is required for the activation of downstream signaling pathways. Thus, the receptor dimerization may be one of the first lines of regulation in activating TLR-mediated signaling pathways and induction of subsequent immune responses. LPS induces the activation of NF-kappaB and IRF3 through MyD88- or TRIF-dependent pathways. Curcumin, a polyphenol found in the plant Curcuma longa, has been shown to suppress the activation of NF-kappaB induced by various pro-inflammatory stimuli by inhibiting IKKbeta kinase activity in MyD88-dependent pathway. Curcumin also inhibited LPS-induced IRF3 activation. These results imply that curcumin inhibits both MyD88- and TRIF-dependent pathways in LPS-induced TLR4 signaling. However, in TRIF-dependent pathway, curcumin did not inhibit IRF3 activation induced by overexpression of TRIF in 293T cells. These results suggest that TLR4 receptor complex is the molecular target of curcumin in addition to IKKbeta. Here, we report biochemical evidence that phytochemicals (curcumin and sesquiterpene lactone) inhibit both ligand-induced and ligand-independent dimerization of TLR4. Furthermore, these results demonstrate that small molecules with non-microbial origin can directly inhibit TLRs-mediated signaling pathways at the receptor level. These results imply that the activation of TLRs and subsequent immune/inflammatory responses induced by endogenous molecules or chronic infection can be modulated by certain dietary phytochemicals we consume daily.     

Astrocytes in the damaged brain: Molecular and cellular insights into their reactive response and healing potential

Long considered merely a trophic and mechanical support to neurons, astrocytes have progressively taken the center stage as their ability to react to acute and chronic neurodegenerative situations became increasingly clear. Reactive astrogliosis starts when trigger molecules produced at the injury site drive astrocytes to leave their quiescent state and become activated. Distinctive morphological and biochemical features characterize this process (cell hypertrophy, upregulation of intermediate filaments, and increased cell proliferation). Moreover, reactive astrocytes migrate towards the injured area to constitute the glial scar, and release factors mediating the tissue inflammatory response and remodeling after lesion. A novel view of astrogliosis derives from the finding that subsets of reactive astrocytes can recapitulate stem cell/progenitor features after damage, fostering the concept of astroglia as a promising target for reparative therapies. But which biochemical/signaling pathways modulate astrogliosis with respect to both the time after injury and the type of damage? Are reactive astrocytes overall beneficial or detrimental for neuroprotection and tissue regeneration? This debate has been animating this research field for several years now, and an integrated view on the results obtained and the possible future perspectives is needed. With this Commentary article we have attempted to answer the above-mentioned questions by reviewing the current knowledge on the molecular mechanisms controlling and sustaining the reaction of astroglia to injury and its stem cell-like properties. Moreover, the cellular/molecular mechanisms supporting the detrimental or beneficial features of astrogliosis have been scrutinized to gain insights on possible pharmacological approaches to enhance astrocyte neuroprotective activities.     

重组人干扰素β-1a注射液制剂安全性研究

目的 检测重组人干扰素β-1a注射液的制剂安全性并探讨可能的影响因素。方法 分别以重组人干扰素β-1a注射液进行家兔肌肉和皮下刺激性试验、豚鼠主动全身过敏性试验、大鼠被动皮肤过敏性试验和体外溶血性试验,检测药物的局部刺激性、Ⅰ型过敏反应性和溶血作用。结果 pH 3.6的11、22 μg/kg重组人干扰素及其空白溶媒对家兔肌肉和皮肤黏膜具有轻度刺激作用,相应剂量下pH为4.3的重组干扰素及其空白溶媒对家兔组织无明显刺激作用;pH 3.5的5.5、22 μg/kg剂量下重组人干扰素及其空白溶媒对大鼠无被动致敏作用,对豚鼠主动致敏作用呈强阳性,辅料中不含人血清白蛋白的样品则对豚鼠无致敏作用;pH 3.5的重组人干扰素对家兔红细胞具有极轻度体外溶血作用,pH 4.5样品则无体外溶血和致红细胞凝聚作用。结论 pH值对重组人干扰素β-1a注射液刺激性和体外溶血性具有一定影响,应注意对其pH值的控制;干扰素对豚鼠致敏作用为辅料中人血清白蛋白所致,临床使用中对人产生致敏的可能性很小。重组人干扰素β-1a注射液制剂安全性较好。     

结核感染T细胞斑点试验在手、腕部腱鞘结核诊断中的应用评价

目的 探讨结核感染T细胞斑点试验(T-cell spot of Tuberculosis,T-SPOT.TB)在手、腕部腱鞘结核诊断中的临床应用价值.方法 通过对2012年1月至2018年1月我院收集64例怀疑手、腕部腱鞘结核临床资料进行回顾性分析,根据病理诊断及临床表现判断有无结核分枝杆菌感染;全部病例均经过T-SP...     

奥平栓联合微波治疗宫颈糜烂的临床体会

目的:探索不同类型宫颈糜烂患者适宜的治疗方法。方法:2004年10月至2008年5月我院将729例宫颈糜烂患者(单纯型140例,颗粒型235例,乳头型354例)随机分成3组,分别采用奥平栓、微波进行治疗,观察和比较其疗效和副反应。结果:奥平栓对单纯型宫颈糜烂的治疗率显著优于颗粒型和乳头型(P<0.05,P<0.01);微波对单纯型宫颈糜烂的治疗率显著优于颗粒型及乳头型(P<0.01),奥平栓加微波对颗粒型治愈率同其他两组差异无显著性意义(P>0.05),而对乳头型宫颈糜烂的治愈率在3种疗法中最高(P<0.01)。副反应以奥平栓最少。结论:单纯型及乳头型宫颈糜烂以奥平栓加微波治疗效果最佳。     

干扰素联合苦参素抗乙型肝炎病毒疗效观察

目的:探讨干扰素联合苦参素治疗慢性乙型肝炎的抗病毒效果。方法:98例慢性乙肝患者,随机分为治疗组51例,对照组47例。治疗组采用α干扰素5MU/d,肌注,连用15d后改tiw,疗程6个月。同时加用苦参素注射液-600mg/d,3个月后改口服苦参素胶囊,200mg,tid,疗程共6个月。对照组单用干扰素,剂量疗程相同。疗程结束时,观察两组患者乙肝病毒标志和HBV载量。结果:干扰素联合苦参素治疗组和对照组HBeAg阴转率分别为54.9%(28/51)与34.0%(16/47),P<0.05;HBsAg阴转率分别为9.8%(5/51)与6.4%(3/47),P>0.05;HBV-DNA阴转率分别为58.8%(30/51)与40.4%(19/47),P>0.05。结论:干扰素联合苦参素具有较好的抑制病毒复制功效并可减轻药物副反应故可作为慢,,性乙肝治疗方案的参考。     

IFIH1基因突变致Aicardi⁃Goutières综合征7型1例并文献复习

目的 报道1例Aicardi-Goutières综合征(AGS)7型患儿的临床特点,总结国外既往报道病例特点.方法 回顾分析1例AGS7型患儿的临床表现、Ⅰ型干扰素刺激基因表达和全外显子(WES)测序结果.检索PubMed数据库、万方数据库及中国知网数据库中IFIH1或MDA5基因突变导致AGS7的病例,总结临床特征和...