简介：AbstractLeucine-rich repeats containing 4 (LRRC4, also named netrin-G ligand 2 [NGL-2]) is a member of the NetrinGs ligands (NGLs) family. As a gene with relatively high and specific expression in brain, it is a member of the leucine-rich repeat superfamily and has been proven to be a suppressor gene for gliomas, thus being involved in gliomagenesis. LRRC4 is the core of microRNA-dependent multi-phase regulatory loops that inhibit the proliferation and invasion of glioblastoma (GB) cells, including LRRC4/NGL2-activator protein 2 (AP2)-microRNA (miR) 182-LRRC4 and LRRC4-miR185-DNA methyltransferase 1 (DNMT1)-LRRC4/specific protein 1 (SP1)-DNMT1-LRRC4. In this review, we demonstrated LRRC4 as a new member of the partitioning-defective protein (PAR) polarity complex that promotes axon differentiation, mediates the formation and plasticity of synapses, and assists information input to the hippocampus and storage of memory. As an important synapse regulator, aberrant expression of LRRC4 has been detected in autism, spinal injury and GBs. LRRC4 is a candidate susceptibility gene for autism and a neuro-protective factor in spinal nerve damage. In GBs, LRRC4 is a novel inhibitor of autophagy, and an inhibitor of protein-protein interactions involving in temozolomide resistance, tumor immune microenvironment, and formation of circular RNA.

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简介：摘要目的探讨血清免疫球蛋白G4（IgG4）和IgG4/免疫球蛋白G（IgG）比率在IgG4相关性疾病（IgG4-RD）和其他自身免疫性疾病鉴别诊断中的价值。方法收集2021年1月至2022年7月在北京医院治疗的确诊为IgG4-RD患者35例、自身免疫性疾病患者937例及同期健康体检者200例的资料。使用IMMAGE 800和BNⅡ全自动特种蛋白分析仪检测IgG和IgG4，并绘制IgG4、IgG4/IgG比率的受试者工作特征曲线（ROC曲线）进行分析。结果IgG4-RD组血清IgG4含量、IgG4/IgG比率分别为2.83（2.01，5.07）g/L、25（18，43）%，高于自身免疫性疾病患者组的0.35（0.16，0.72）g/L、3（1，6）%及健康对照组的0.27（0.14，0.49）g/L、2（1，4）%，差异均有统计学意义（U=795.50、82.50、1 744.50、205.50，均P < 0.001）。以IgG4 ≥ 1.35 g/L为标准，筛选出三组中IgG4 ≥ 1.35 g/L的病例，IgG4-RD组血清IgG4/IgG与非IgG4-RD患者组差异有统计学意义（U=453.50，P < 0.001）。绘制IgG4、IgG4/IgG比率ROC曲线，IgG4为1.47 g/L时，敏感性91.7%，特异性83.5%，曲线下面积0.96；IgG4/IgG为12.5%时，敏感性91.4%，特异性85%，曲线下面积0.96。以IgG4 ≥ 1.47g/L、IgG4/IgG ≥ 12.5%为诊断标准时，敏感性94.3%，特异性85.9%，曲线下面积0.96，高于单独血清IgG4诊断IgG4- RD综合敏感性的87.2%、特异性的82.6%。结论由于非IgG4-RD疾病也可出现IgG4升高的现象，故以IgG4 ≥ 1.47 g/L为诊断标准时，其敏感性、特异性最高，同时联合检测IgG4/IgG比率可提高IgG4-RD的诊断效能。

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简介：摘要：以聚乙二醇（Agilent DB-FFAP（30m×0.25mm×0.25µm）或极性相近）为固定液的毛细管色谱柱，采用GC法测定4-甲基吡啶有关物质，该方法对有关物质检测准确、有效。各杂质定量限符合要求、线性关系良好。

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