Gingival crevicular fluid levels of SLIT3 are increased in periodontal disease

This study aims to investigate the levels of SLIT3 in gingival crevicular fluid (GCF) of healthy and periodontal disease subjects, and their correlations to periodontal disease. A total of 45 periodontal patients and 45 periodontally healthy volunteers were enrolled. The clinical parameters, radiographic bone loss and the levels of SLIT3, receptor activator of NF‐κB ligand (RANKL) and osteoprotegerin (OPG) in GCF were measured. The prevalences of Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia in subgingival plaque were also analyzed. The expression of SLIT3 and RANKL was detected in the periodontium of experimental periodontitis in rats and lipopolysaccharide (LPS)‐induced mouse macrophage. The total amounts and concentrations of SLIT3 and RANKL were significantly higher in periodontitis than those in healthy, while the level of OPG was significantly lower (p < .05). Significant positive correlations were observed between the level of GCF SLIT3 and clinical attachment level and radiographic bone loss (p < .05). There existed a significant positive correlation between SLIT3 and RANKL (p < .05). Increased expression of SLIT3 and RANKL was observed in the periodontium of periodontal rats. SLIT3 expression was induced by LPS stimulation in macrophages. These results suggest that SLIT3 may act as a diagnostic indicator of periodontal disease and should be further investigated.     

动物类中药材使用情况及常见质量问题探讨

目的：动物类中药材在中国具有悠久的应用历史,在中医药宝库中占有重要的地位,但部分动物药材品种在炮制加工、贮藏、使用方法等方面尚存在一定的安全风险。本文梳理了动物类中药材可能存在的质量安全风险点,以期对保障动物类中药材的质量和控制生物安全隐患提供借鉴。方法：本文通过对动物类中药材相关标准及文献的整理研究,发现可能存在的质量安全风险点。结果与结论：目前动物类中药材存在质量标准不完善,药材在运输、保存过程中受污染、变质,缺少相关指导原则的问题。对此,应提高、完善质量标准,加强动物类中药材在贮藏、流通、运输过程的管理,制定相关质控指导原则,保障人民用药安全。     

Ca2+ influx through T- and L-type Ca2+ channels have different effects on myocyte contractility and induce unique cardiac phenotypes

T-type Ca(2+) channels (TTCCs) are expressed in the developing heart, are not present in the adult ventricle, and are reexpressed in cardiac diseases involving cardiac dysfunction and premature, arrhythmogenic death. The goal of this study was to determine the functional role of increased Ca(2+) influx through reexpressed TTCCs in the adult heart. A mouse line with cardiac-specific, conditional expression of the alpha1G-TTCC was used to increase Ca(2+) influx through TTCCs. alpha1G hearts had mild increases in contractility but no cardiac histopathology or premature death. This contrasts with the pathological phenotype of a previously studied mouse with increased Ca(2+) influx through the L-type Ca(2+) channel (LTCC) secondary to overexpression of its beta2a subunit. Although alpha1G and beta2a myocytes had similar increases in Ca(2+) influx, alpha1G myocytes had smaller increases in contraction magnitude, and, unlike beta2a myocytes, there were no increases in sarcoplasmic reticulum Ca(2+) loading. Ca(2+) influx through TTCCs also did not induce normal sarcoplasmic reticulum Ca(2+) release. alpha1G myocytes had changes in LTCC, SERCA2a, and phospholamban abundance, which appear to be adaptations that help maintain Ca(2+) homeostasis. Immunostaining suggested that the majority of alpha1G-TTCCs were on the surface membrane. Osmotic shock, which selectively eliminates T-tubules, induced a greater reduction in L- versus TTCC currents. These studies suggest that T- and LTCCs are in different portions of the sarcolemma (surface membrane versus T-tubules) and that Ca(2+) influx through these channels induce different effects on myocyte contractility and lead to distinct cardiac phenotypes.     

胰腺癌伴神经浸润动物模型的建立

目的 建立胰腺癌伴神经浸润的动物模型.方法 32只裸鼠分为4组,每组8只.将人胰腺癌细胞SW1990、CAPAN-2、PANC1分别注射于裸鼠的坐骨神经周围,以不做任何处理的裸鼠作为对照组.观察术后裸鼠体质量变化、成瘤情况、成瘤时间、造模成功率等指标.结果 对照组裸鼠体质量增加,各癌细胞注射组裸鼠成瘤后体质量明显下降,甚至呈现恶液质,成瘤侧肢体活动受限.CAPAN-2注射组及SW1990注射组的8只裸鼠最终均成瘤,PANC1注射组只有5只成瘤.以肿瘤最长径长至约0.8 cm为时间截点,CAPAN-2注射组、PANC1注射组、SW1990注射组裸鼠的成瘤时间分别为（49.8±5.0）、（56.6±2.4）、（25.4±3.0）d.SW1990注射组成瘤时间最短,PANC1注射组成瘤时间最长,3组间成瘤时间的差异具有统计学意义（F=73.51,P＜0.01）.CAPAN-2注射组、PANC1注射组、SW1990注射组裸鼠神经浸润造模成功率分别为87.5％ （7/8）、20.0％（1/5）、50.0％ （4/8）.结论 成功建立了胰腺癌伴神经浸润动物模型,但不同的胰腺癌细胞系建立的动物模型具有不同的特点.     

吉西他滨对Beclinl基因沉默的人胰腺癌MiaPaCa-2细胞的周期及凋亡的影响

目的 探讨吉西他滨对Beclinl基因沉默的人胰腺癌MiaPaCa-2细胞周期及凋亡的影响.方法 构建靶向Beclinl的siRNA,插入表达质粒,转染MiaPaCa-2细胞.采用RT-PCR法和蛋白质印迹法检测细胞Beclinl mRNA及蛋白的表达,应用吉西他滨处理Beclinl基因沉默的MiaPaCa-2细胞,应用流式细胞仪检测细胞周期及细胞凋亡状况.结果 成功获得Beclin1基因沉默的MiaPaCa-2细胞,转染后细胞的Beclin1 mRNA表达量从对照组的1.0下降到0.295;S、G2期细胞数减少,而G1期细胞增多;细胞凋亡未受影响.应用吉西他滨处理后,Beclin1基因沉默的MiaPaCa-2细胞的S期细胞数进一步减少,而G1、G2期细胞增多,细胞凋亡被抑制.结论 Beclinl表达沉默使人胰腺癌细胞系MiaPaCa-2细胞周期发生改变,并影响吉西他滨对细胞周期及凋亡的作用.     

Recombinant Lactococcus Expressing a Novel Variant of Infectious Bursal Disease Virus VP2 Protein Can Induce Unique Specific Neutralizing Antibodies in Chickens and Provide Complete Protection

Recent reports of infectious bursal disease virus (IBDV) infections in China, Japan, and North America have indicated the presence of variant, and the current conventional IBDV vaccine cannot completely protect against variant IBDV. In this study, we constructed recombinant Lactococcus lactis (r-L. lactis) expressing a novel variant of IBDV VP2 (avVP2) protein along with the Salmonella resistance to complement killing (RCK) protein, and Western blotting analysis confirmed that r-L. lactis successfully expressed avVP2-RCK fusion protein. We immunized chickens with this vaccine and subsequently challenged them with the very virulent IBDV (vvIBDV) and a novel variant wild IBDV (avIBDV) to evaluate the immune effect of the vaccine. The results show that the r-L. lactis-avVP2-RCK-immunized group exhibited a 100% protection rate when challenged with avIBDV and 100% survival rate to vvIBDV. Furthermore, this immunization resulted in the production of unique neutralizing antibodies that cannot be detected by conventional ELISA. These results indicate that r-L. lactis-avVP2-RCK is a promising candidate vaccine against IBDV infections, which can produce unique neutralizing antibodies that cannot be produced by other vaccines and protect against IBDV infection, especially against the variant strain.