Contribution of IL-13 to early exocrinopathy in Id3-/- mice

Id3-/- mice represent a model for T cell mediated primary Sjogren's syndrome (PSS). An intriguing feature of this disease model is the early appearance of impaired salivary function or exocrinopathy prior to lymphocytic infiltration of the salivary glands. This phenomenon prompted us to examine the role of cytokines produced by T cells in the systemic regulation of gland function. A comprehensive examination of serum cytokine profiles revealed elevated levels of IL-13 in Id3-/- mice. We found that the increase in serum IL-13 levels in Id3-/- mice was largely dependent on αβ T cells. Removal of αβ T cells in Id3-/- mice also eliminates disease symptoms, including lymphocytic infiltration in the gland tissues, and impaired saliva production. We further show that the number of mast cells in the salivary glands of Id3-/- mice is significantly increased, in a trend inversely related to the saliva production. This increase in the number of mast cells is also dependent on the presence of αβ T cells. Treatment of young Id3-/- mice with anti-IL-13 antibodies over a two-month period resulted in a reduction of both serum IL-13 levels and the number of mast cells in the salivary gland tissues, as well as correspondingly improved saliva production. These findings indicate a potentially important role for IL-13 in gland regulation and disease pathology.     

Identification of non-essential regions in nucleocapsid protein of porcine reproductive and respiratory syndrome virus for replication in cell culture

Nucleocapsid (N) protein of porcine reproductive and respiratory syndrome virus (PRRSV) plays a central role in virus replication. In this study, serial N- and C-terminal truncations of N protein were performed in the context of type 2 PRRSV infectious cDNA clone, and our results revealed that a stretch of inter-genotypic variable N terminal residues aa 5-13 ((5)NGKQQKKK(13)K) and the last four inter-genotypic variable aa residues ((120)SPS(123)A) at the C terminus of N protein were dispensable for type 2 PRRSV infectivity. All the recovered deletion mutant viruses had spontaneous mutations in the N coding region, including substitution, deletion and insertion. We re-engineered the additional internal deletion with or without the original C-terminal deletion back into wild-type APRRS and found that the internal domain spanning the inter-genotypic variable residues 39-42 ((39)KGP(42)G) and conserved residues 48-52 ((48)KNPE(52)K), respectively, were dispensable for type 2 PRRSV viability. These results demonstrated that N protein contains non-essential regions for virus viability in cell culture. Such dispensable regions could be utilized as insertion site for foreign tag expression and the rescued viruses could be the candidates for marker vaccine.     

Helicobacter pylori-infected macrophages induce Th17 cell differentiation

Th17 cells represent a novel subset of CD4(+) T cells, which is associated with chronic inflammation. The present study evaluated Th17 cell responses to Helicobacter pylori infection in mouse model and CD4(+) T cell differentiation in response to H. pylori-infected macrophages. Th17 cells were observed in the H. pylori-infected gastric tissue. Co-culture of CD4(+) T cells with H. pylori-infected macrophages elevated IL-17 and IFN-γ secretion, up-regulated retinoid-related orphan receptor gamma t (RORγt) and T box expressed in T cells (T-bet) expression and increased the numbers of Th17 and Th1 cells. The expression of CD40, CD80, and CD86 and the secretion of IL-6, TGF-β1, IL-23, and CCL20 were significantly increased in H. pylori-stimulated macrophages. NF-κB pathway participated in the production of IL-6, IL-23, and CCL20 from macrophages in response to H. pylori, and inhibition of NF-κB pathway of macrophages resulted in less Th17 cell differentiation. Taken together, these results suggest that H. pylori induces Th17 cell differentiation via infected macrophages.     

小柴胡汤滴丸质量标准研究

目的建立小柴胡汤滴丸的质量标准。方法采用薄层色谱(TLC)法对小柴胡汤滴丸中的柴胡、黄芩进行薄层色谱定性鉴别,采用HPLC法对制剂中黄芩的黄芩苷进行含量测定,采用Hypemil C18色谱柱(250 mm×4.6 mm,5μm),流动相为甲醇-0.2%磷酸溶液(45∶55),检测波长为280 nm,柱温30℃。结果薄层鉴别的色谱斑点清晰,阴性对照无干扰;黄芩苷在0.1～1.2μg/mL范围内呈良好线性关系,平均回收率为99.20%,RSD为2.29%(n=6)。结论本方法可用于小柴胡汤滴丸的质量控制,具有简便、准确及专属性强的特点。     

临床实验室仪器设备的校准与校准验证

本文从临床实验室仪器设备校准和校准验证的重要性出发,分析当前实验室仪器设备校准和校准验证工作不容乐观的现状;论述临床实验室仪器设备校准中存在的诸多问题;探讨针对这些问题应采取哪些措施以规范、改进临床实验室的仪器设备的校准和校准验证工作.     

冬青注射液血管刺激性、溶血性及过敏性试验研究

目的评价毛冬青注射液的安全性,为临床用药提供实验依据。方法通过血管刺激性试验、体外溶血性试验、全身主动过敏性试验(ASA)和被动皮肤过敏试验(PCA),评价毛冬青注射液的安全性。结果毛冬青注射液无明显血管刺激性;无溶血和凝集反应;豚鼠全身主动过敏性试验与被动皮肤过敏试验均为阴性。结论在本次实验条件下,毛冬青注射液符合注射剂安全要求。     

川崎病辅助检查分析

目的:通过对川崎病(KD)的辅助检查分析,达到早期诊断、早期治疗的目的。方法:对吕梁市人民医院儿科2000年1月—2012年6月住院的98例川崎病患儿实验室检查资料进行回顾性分析和总结。结果:98例川崎病中异常冠状动脉32例,其中冠状动脉测定内径正常,但动脉壁增厚,回声增强者5例,冠状动脉内径扩张者24例,冠状动脉瘤3例,均有血沉增快,血小板增多。结论:川崎病易合并冠状动脉损害,严重影响儿童身体健康,而不典型病例较多,故结合辅助检查早期诊断、及时适当治疗可减少并发症,改善预后。     

信号通路在弥漫性大B细胞淋巴瘤发病过程中的作用

弥漫性大B细胞淋巴瘤(DLBCL)是最常见的一种B细胞恶性肿瘤,约占成人非霍奇金淋巴瘤的30%～40%.依据肿瘤细胞起源大致可将DLBCL分为生发中心B细胞型(GCB型)及非生发中心B细胞型(非GCB型).B细胞发育过程中,多种信号通路精确地调控其细胞周期、增殖、分化及凋亡,以达到平衡,确保B细胞的正常发育及成熟.     

完全脾切除增加了小鼠胰岛对STZ的敏感性

目的: 探讨脾脏对链脲菌素(STZ)损伤胰岛β细胞是否具有保护作用。方法: 以外科手术切除小鼠全脾。60只脾切除小鼠随机分为3组,分别以80 mg/kg、160 mg/kg STZ给小鼠腹腔注射,另一组腹腔注射生理盐水。60只正常小鼠做同样分组及处理。1周后,测定各组小鼠空腹血糖、血清胰岛素水平,免疫组化分析各组胰岛β细胞总量,ELISA法分析胰岛细胞凋亡,Luminol化学发光法测定各组胰腺活性氧簇(ROS)水平。结果: 80 mg/kg STZ处理脾切除组空腹血糖浓度显著升高,血清胰岛素显著降低;同剂量STZ处理的正常小鼠血糖及胰岛素水平则正常;此外, 80 mg/kg STZ处理的脾切除小鼠β细胞总量、胰岛凋亡细胞核小体聚集值及胰腺组织ROS的产生与同剂量STZ处理的正常小鼠相比均有显著差异。结论: 脾可以阻止低剂量STZ对正常小鼠胰岛β细胞的破坏作用。完全脾切除增加了胰岛对STZ的敏感性,这一作用与胰腺组织ROS增加相关。