Functional expression of B7H1 on pancreatic carcinoma panc-1 cells

AIM: To observe the effect of B7H1 expression in pancreatic carcinoma cells on the proliferation and activation of co-cultured T lymphocytes. METHODS: B7H1 expression in panc-1 cells before and after interferon-γ(IFN-γ) treatment or B7H1-siRNA transfection was evaluated by RT-PCR and flow cytometry. The influence of B7H1 expression on co-cultured PHA-activated T lymphocytes was determined by the methods of MTT and enzyme-linked immunosorbent assay (ELISA). RESULTS: B7H1 was highly expressed in panc-1 cells and up-regulated after IFN-γ stimulation. Such up-regulation led to the significant inhibition of T cell proliferation and secretion of cytokines such as IFN-γ and interleukin-2(IL-2). However, IL-10 production was enhanced. In contrast, knockdown of B7H1 expression in panc-1 cells by RNA interference resulted in increased T cell proliferation as well as IFN-γ and IL-2 production. Meanwhile, the IL-10 secretion decreased. CONCLUSION: B7H1-expressing panc-1 cells suppress T cell function by inhibiting T cell proliferation and production of Th1 cytokines. Suppression of B7H1 expression through siRNA restores T cell immune functions, indicating a potential strategy for immunotherapy against pancreatic cancer.     

单克隆抗体在水产无脊椎动物血淋巴细胞研究中的应用

近年来,单克隆抗体在水产无脊椎动物血淋巴细胞研究中的应用越来越广泛,迄今报道的研究种类主要是对虾和贝类,另外还包括一些其他水产无脊椎动物,如海参等。主要应用于血淋巴细胞的识别和鉴定,并对其个体的发生和分化方面也进行了初步的研究。对单克隆抗体在水产无脊椎动物血淋巴细胞的分类、分布、发生和功能研究等方面的应用进行了综述。     

甘氨胆酸对小鼠体外脾淋巴细胞凋亡的影响

本研究旨在探索不同浓度的甘氨胆酸(Glycocholic acid,GCA)对小鼠体外脾淋巴细胞凋亡的影响。在0.02μg/ml,0.035μg/ml,0.07μg/ml,0.21μg/ml,1.05μg/mL不同浓度的GCA作用下,应用倒置显微镜观察了体外脾淋巴细胞的核形态,采用琼脂糖凝胶电泳法检测了脾淋巴细胞的DNA片段,采用流式细胞仪测定了脾淋巴细胞凋亡早期磷脂酰丝氨酸外翻百分率;采用分光光度法测定了凋亡细胞氧化还原反应活性——GSH的含量;通过ELISA法检测了Caspase-3和Caspase-9的活性。结果:GCA能够使脾淋巴细胞细胞产生核固缩和凋亡小体;显著引起脾淋巴细胞DNA片段化(P<0.05),极显著的诱导脾淋巴细胞磷脂酰丝氨酸外翻(P<0.01);显著降低GSH的含量(P<0.05);显著提高Caspase-9和Caspase-3的活性(P<0.05)。结论:GCA具有显著的提高小鼠体外脾淋巴细胞凋亡的作用(P<0.05)。     

肉仔鸡肠道B淋巴细胞Ca2+浓度流式细胞术测定方法的建立

[目的]建立以流式细胞术结合Fluo-3-AM测定肉仔鸡肠道B淋巴细胞胞内Ca2+浓度的方法.[方法]分离培养21 d肉仔鸡肠道B淋巴细胞,以不同质量浓度(0,5,10,15,20 μg/mL)脂多糖(LPS)刺激B淋巴细胞,测定B淋巴细胞刺激指数(SI),确定B淋巴细胞增殖的最适LPS质量浓度,建立肉仔鸡B淋巴细胞体...     

马蹄香含药血清对小鼠脾淋巴细胞和腹腔巨嗜细胞的影响

[目的]研究马蹄香（Valeriana jatamansiJones）含药血清对小鼠脾淋巴细胞及腹腔巨嗜细胞的影响。[方法]通过MTT法检测含药血清对正常小鼠脾淋巴细胞转化的影响,结合中性红吞噬实验检测含药血清对小鼠腹腔巨噬细胞能量代谢水平及吞噬能力的影响。[结果]在一定剂量范围内,马蹄香含药血清组的脾淋巴细胞和腹腔巨噬细胞无论单独作用或协同非特异性丝裂原（Con A或LPS）作用与对照组均有显著性差异。[结论]马蹄香含药血清能够增强小鼠脾淋巴细胞转化能力,提高腹腔巨噬细胞能量代谢水平和吞噬能力,具有一定的免疫增强作用。     

Effect of dietary rosemary extract on cell-mediated immunity of young rats

The impact of rosemary extract on splenic mononuclear cell proliferation was determined. Weanling male Sprague-Dawley rats were fed diets containing 0, 100, 200 or 400 ppm rosemary extract or 400 ppm butylated hydroxytoluene (BHT) in combinatiion with 10 or 20% casein enriched diets for 8 weeks. Splenic mononuclear cells were isolated from these animals and mitogenic response to Concanavalin A (Con A), Phytohemagglutinin (PHA) and lipopolysaccharide was determined. Con A and PHA-stimulated proliferation of spleen cells from rats fed 10% casein and 200 ppm rosemary extract was significantly higher than that of cells from the corresponding control animals. However, other levels of rosemary at 10% dietary casein or rosemary at any concentration fed along with 20% dietary casein had no impact on the mitogenic stimulation of splenic mononuclear cells. Thus, these results suggest that the use of rosemary might not have a generalized immunoenhancing effect, and will probably be effective in some stressed conditions, such as protein or antioxidant deficiency.