软骨多糖对荷瘤小鼠免疫功能影响的初步研究

目的研究软骨多糖对荷瘤小鼠的作用,并探讨其对免疫功能的影响。方法采用小鼠肉瘤S180细胞建立动物腹水瘤模型,然后随机将小鼠分为生理盐水对照组和软骨多糖给药组,连续腹腔注射生理盐水或软骨多糖,分别测量ConA和LPS刺激下小鼠脾细胞淋巴增殖情况、外周血NK细胞的活性,及外周血单个核细胞E花环形成率。结果软骨多糖能刺激淋巴细胞增殖,明显提高NK细胞的活性,提高E花环形成率。结论软骨多糖能通过增强S180荷瘤小鼠的免疫功能而抑制肿瘤的生长。     

野生地参多糖对四氧嘧啶致糖尿病小鼠血糖和血脂的影响

为了研究野生地参多糖对四氧嘧啶(ALX)致糖尿病小鼠血糖和血脂的影响,利用四氧嘧啶(ALX)建立糖尿病小鼠模型,分别灌胃低(100 mg/(kg.d))、中(200 mg/(kg.d))、高(400 mg/(kg.d))剂量地参多糖溶液及阳性对照药盐酸苯乙双胍,正常对照组及糖尿病模型对照组则给等体积生理盐水。结果表明:连续给药14 d后,地参多糖对正常小鼠血糖无明显影响,100、200和400 mg/(kg.d)地参多糖均能明显降低ALX所致糖尿病小鼠高血糖,与糖尿病模型对照组相比,P<0.01;同时,相同剂量的地参多糖还能极显著降低ALX致糖尿病小鼠血清总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)(P<0.01)。中、高剂量地参多糖使糖尿病小鼠血清高密度脂蛋白胆固醇(HDL-C)显著回升(P<0.05),但低剂量地参多糖对糖尿病小鼠血清HDL-C则无明显影响(P>0.05)。地参多糖能明显降低ALX致糖尿病小鼠高血糖及高血脂。     

4-PA对BEL-7402细胞的生长调控和诱导凋亡作用的研究

应用ＭＴＴ、流式细胞术研究了新型肿瘤诱导分化剂４－ ＰＡ 对人肝癌细胞系ＢＥＬ－ ７４０２ 细胞的生长调控、诱导凋亡作用。结果表明： ４ － ＰＡ 对ＢＥＬ－ ７４０２ 细胞增殖抑制的ＩＣ５０ 为４ －９ｍ ｍｏｌ／Ｌ,随着作用时间的增加,ＩＣ５０ 增加。作用效果迅速,在０ ．５ 小时就有效地抑制了细胞增殖,抑制率随４－ ＰＡ 浓度的增加和作用时间的延长而增加,在达到最大抑制率后出现饱和。流式细胞仪对细胞周期和细胞凋亡的分析发现：４ － ＰＡ 对细胞增殖期（Ｓ期、Ｇ２ 期） 有较强的抑制和逆转作用,使细胞群截止在Ｇ１ 期。随着作用时间的延长和４ － ＰＡ 浓度的增加,细胞凋亡的比例增加,凋亡细胞多来自于细胞增殖期（Ｓ 期、Ｇ２ 期） 。诱导凋亡和使细胞截止于细胞静息期是４ － ＰＡ 抑制细胞增殖的主要途径。     

白花蛇舌草豆甾醇对肝癌细胞的体内外抑制作用及对其增殖周期、凋亡的影响

目的:研究白花蛇舌草豆甾醇(stigmasterol from Hedyotis diffusa willd.,SHD)对人肝癌细胞SMMC-7721、BEL-7402的体外抑制作用,对肝癌H22的体内抑制作用及对其增殖周期、凋亡的影响。方法:MTT法评价SHD对人肝癌细胞SMMC-7721、BEL-7402的抑制率变化规律。昆明雄性小鼠60只,随机取10只为正常对照组,余接种H22瘤株,随机分为模型对照组、5-FU阳性对照组(30mg/kg)和高中低剂量SHD给药组(剂量分别为15、30、60mg/kg),腹腔给药10 d后,比较各组瘤重抑制率、H22细胞周期分布、凋亡率。结果:SHD对SMMC-7721、BEL-7402细胞具有体外抑制作用;SHD显著抑制H22肿瘤,增加G0-G1期细胞比例,降低G2/M期细胞比例,促进肿瘤细胞凋亡。结论:SHD在体外、体内均具有抑制肝癌细胞的作用,此作用与阻滞肿瘤细胞增殖周期,促进肿瘤细胞凋亡有关。     

马齿苋多糖对S180荷瘤小鼠免疫功能的影响

本文探讨马齿苋多糖对S180荷瘤小鼠免疫功能的影响。马齿苋采用水提醇沉法得到马齿苋多糖,分别以50、100、200mg／kg通过腹腔给药10d,观察马齿苋多糖对S180荷瘤小鼠的抑瘤作用及对小鼠淋巴细胞转化功能、腹腔巨噬细胞的吞噬能力、白介素-l（IL-1）和白介素-2（IL-2）生成量的影响。结果显示,马齿苋多糖对S180荷瘤小鼠有明显的抑瘤作用,抑瘤率分别为16．92％、51．45％和64．96％。不同剂量马齿苋多糖与对照组相比可明显促进淋巴细胞的转化、小鼠腹腔巨噬细胞吞噬能力,可有效的增加荷瘤小鼠脾淋巴细胞的转化和腹腔巨噬细胞的吞噬能力以及白介素-1（IL-1）和白介素-2（IL-2）的分泌。说明马齿苋多糖对S180荷瘤小鼠具有显著的抗肿瘤作用,其作用机制与增强小鼠免疫作用有关。     

蛋白组学研究抗菌肽对BEL-7402细胞的作用

目的:采用蛋白组学研究家蝇抗菌肽cecropin对人肝癌BEL-7402细胞蛋白的影响,从蛋白质水平探讨抗菌肽抗肿瘤机制.方法:在测定肿瘤细胞生长指数的基础上,通过双向凝胶电泳分离差异蛋白,银染后进行图像分析,对表达差异2倍以上蛋白质点进行胶内酶解和MALDI-TOF-MS检测,获得肽质量指纹谱,应用Mascot搜索引擎在NCBI nr数据库中进行检索鉴定.结果:家蝇抗菌肽cecropin能够抑制BEL-7402细胞的生长,与对照组比较,抗菌肽处理组双向凝胶电泳共答定出12个差异表达蛋白点(上调蛋白6个,下调蛋白6个),大部分与细胞凋亡、细胞代谢、基因转录以及细胞骨架等相关.结论:这为深入研究抗菌肽抗肿瘤机制打下了基础.     

刺参酸性粘多糖对人宫颈癌Hela细胞株增殖的影响

目的:研究刺参酸性粘多糖(SJAMP)对人宫颈癌Hela细胞株增殖的影响,并探讨其可能的作用机制.方法:体外培养Hela细胞;采用四甲基偶氮唑蓝比色法(MTT法)测定SJAMP对Hela细胞的增殖抑制率;免疫细胞化学法检测SJAMP对Hela细胞内突变型P53、细胞周期抑制蛋白P21表达的影响.结果:SJAMP在体外抑制Hela细胞生长呈时效和量效关系;与对照组比,各SJAMP浓度组均能影响细胞周期调控因子p53、p21蛋白的表达:降低p53蛋白的表达(p＜0.05),刺激p21蛋白的表达(p＜0.05).结论:SJAMP可能通过调整细胞周期调节蛋白而在体外对宫颈癌Hela细胞起到生长抑制作用.     

刺参酸性粘多糖对人宫颈癌Hela细胞株增殖的影响(英文)

目的:研究刺参酸性粘多糖(SJAMP)对人宫颈癌Hela细胞株增殖的影响,并探讨其可能的作用机制。方法:体外培养Hela细胞;采用四甲基偶氮唑蓝比色法(MTT法)测定SJAMP对Hela细胞的增殖抑制率;免疫细胞化学法检测SJAMP对Hela细胞内突变型P53、细胞周期抑制蛋白P21表达的影响。结果:SJAMP在体外抑制Hela细胞生长呈时效和量效关系;与对照组比,各SJAMP浓度组均能影响细胞周期调控因子p53、p21蛋白的表达:降低p53蛋白的表达(p<0.05),刺激p21蛋白的表达(p<0.05)。结论:SJAMP可能通过调整细胞周期调节蛋白而在体外对宫颈癌Hela细胞起到生长抑制作用。     

雪灵芝粗多糖对S180荷瘤小鼠免疫功能的影响

目的:建立S180荷瘤小鼠模型,探讨雪灵芝粗多糖(AKCP)对荷瘤小鼠免疫功能的影响.方法:Balb/c小鼠随机分为6组:正常组、模型组、香菇多糖(LNT,0.25 mg/kg)组和AKCP-H(200 mg/kg)、AKCP-M(100 mg/kg)、AKCP-L(50 mg/kg)剂量组,除正常组外,其余5组建立S...     

紫菜多糖对免疫细胞及肿瘤细胞生长的影响（英文）

采用细胞培养技术测定从条斑紫菜中得到的多糖PY3对小鼠免疫细胞及人肿瘤细胞K562生长的影响。结果表明,PY3对小鼠骨髓细胞和脾脏淋巴细胞的增殖以及对混合淋巴细胞反应均有一定的促进作用。PY3对血癌细胞K562的生长有一定的抑制作用,研究表明多糖PY3不仅能够提高小鼠免疫细胞的功能,而且有一定的抗肿瘤作用。     

硬毛地笋化学成分研究

采用各种色谱对硬毛地笋(Lycopus lucidus Turcz.var.hirtus Regel)的化学成分进行分离,通过理化性质和波谱分析进行结构鉴定。从硬毛地笋全草甲醇提取物中分离鉴定了9个化合物:β-胡萝卜素(1),7,3’,4’-三羟基黄酮(2),β-谷甾醇(3),3’,4’,5-三羟基-3,7-二甲氧基黄酮(4),α-香树脂醇(5),β-香树脂醇(6),24-羟基-乌苏-12-烯-28-酸(7),β-胡萝卜苷(8),24-甲基-5α-胆甾-7,22-二烯-6α-醇-3β-O-葡萄糖苷(9)。化合物4,7和9为首次从该科植物中分离得到,化合物1～9均为首次从硬毛地笋中分离得到。     

Manganese superoxide dismutase expressed in silkworm larvae,Bombyx mori L enhances the NK activity and splenocyte proliferation against Sarcoma 180 tumor cells in vivo

Natural killer cell (NK) is known as a major immune system in body through mediating cell death via several possible pathways, and one of three subpopulations of lymphocytes functioning as scavenger of tumor, virus infected cells etc. Our present results found that the SOD-contained silkworm larvae powder caused an enhancement of the effect on NK cell cytotoxicity, which implied this material modulated the immune system in mice in vivo. The NK cell activities of S180 tumor modeled mice treated with silkworm powder including SOD were enhanced significantly ranging from 30% to 48%, respectively, compare to a distilled water feeding control and silkworm powder without SOD. Meanwhile, the ConA-stimulated splenocyte proliferation of all three treated groups was higher than that of the control both in T cells or B cells. The average tumor weight of S180 modeled mice treated with doses of SOD-contained silkworm powder was lighter than that of water control showing the tumor inhibition rates (IR) reached to 22.51% to 37%, respectively. In conclusion, these findings demonstrate that administration of silkworm larvae powder containing SOD results in activation of NK cells and immune T-cell and B-cell, suggesting the silkworm larvae powder containing SOD play a positive role in tumor inhibition.     

Effects of basic fibroblast growth factor on angiogenin expression and cell proliferation in H7402 human hepatoma cells

Hepatocellular carcinoma （HCC） is one of the most common cancers worldwide. Basic fibroblast growth factor （bFGF）, which is highly expressed in developing tissues and malignant cells, regulates cell growth, differentiation, and migration. Its expression is essential for the progression and metastasis of HCC. This study aims to investigate the effects of bFGF on the expression of angiogenin, another growth factor, which plays an important role in tumor angiogenesis, and on cell proliferation in H7402 human hepatoma cells. The bFGF sense cDNA or antisense cDNA was stably transfected into H7402 cells. Genomic DNA PCR analysis demonstrated that human bFGF sense cDNA or antisense cDNA was inserted into the genome. Furthermore, the expression of bFGF and angiogenin was examined by RT-PCR and Western blot assays. MTT and colony formation assays were employed to determine cell proliferation. Stable bFGF over-expressing and under-expressing transfectants were successfully established. Expression of angiogenin was decreased in the over-expressing bFGF cells （sense transfectants） and was increased in the under-expressing bFGF cells （antisense transfectants）. Cell proliferation increased in the bFGF sense transfectants and decreased in the bFGF antisense transfectants. These results demonstrated that the endogenous bFGF may not only negatively regulate the angiogenin expression but also contribute to the overall cell proliferation in H7402 human hepatoma cells. This study may be helpful in finding a potential therapeutic approach to HCC.     

Activity of Porphyridium sp. polysaccharide against herpes simplex viruses in vitro and in vivo.

The cell wall sulfated polysaccharide of the red microalga Porphyridium sp. exhibited impressive antiviral activity against herpes simplex virus types 1 and 2 (HSV-1 and -2) both in vitro (cell culture) and in vivo (rats and rabbits). Depending on the concentration, this polysaccharide completely inhibited or slowed down the development of the cytopathic effect in HSV-infected cells, but did not show any cytotoxic effects on vero cells even when a concentration as high as 250 μg/ml was used. There was indirect evidence for a strong interaction between the polysaccharide and HSV and a weak interaction with the cell surface. When tested in vivo, Porphyridium sp. polysaccharide conferred significant and efficient protection against HSV-1 infection: at a concentration as low as 100 μg/ml, it prevented the appearance and development of symptoms of HSV-1 infection in rats and rabbits. The polysaccharide did not exhibit any cytotoxic effects at a concentration of 2 mg/ml in vivo.     

Suppressor factor from tumor-allosensitized spleen cells--its effect on in vitro proliferation of tumor cells and in vivo skin allograft survival

C57BL/6 mice are sensitized ip with allogeneic P-815 mastocytoma cells. Fifteen days later the spleen cells of the sensitized mice are used in the production of suppressor factor or treated with mitomycin and used as suppressor cells. Sensitized spleen cells incubated with the specific alloantigen (DBA/2 m-treated spleen cells) release suppressor factor (SF)² which inhibits cell proliferation in mixed lymphocyte culture (MLC) as well as the in vitro generation of cytotoxic cells (CML). SF is most effective when added eary during MLC. SF also inhibits mitogen responsiveness of normal spleen cells. In addition to inhibiting lymphocyte function in vitro, suppressor cells as well as SF inhibit the in vitro proliferation of tumor cells. This inhibition is specific for the tumor to which the suppressor cells are induced. The inhibition of tumor cell proliferation is not due to the presence of cytotoxic cells in the spleen of the tumor-allosensitized mice. Suppressor cells from neonatal mice do not inhibit the in vitro proliferation of tumor cells. SF injected iv into C57BL/6 mice decreases the mixed lymphocyte reactivity of the host spleen cells and decreases the ability of the host to reject skin allografts. We interpret these data to suggest that tumor-allosensitized spleen cells, and the SF they produce, not only affect lymphocyte function but also inhibit tumor cell proliferation. This dual effect of suppressor cells could be an important part of the immune surveillance against tumors.     

Catalytic synthesis and antioxidant activity of sulfated polysaccharide from Momordica charantia L.

Sulfated derivatives of polysaccharide from Momordica charantia L. (MCPS) with different degree of sulfation (DS) were synthesized by chlorosulfonic acid method with ionic liquids as solvent. Fourier transform infrared spectra and ¹³C nuclear magnetic resonance spectra indicated that C‐6 substitution was predominant in MCPS compared with the C‐2 position. Compared with the native polysaccharide from Momordica charantia L. (MCP), MCPS exhibited more excellent antioxidant activities in vitro, which indicated that sulfated modification could enhance antioxidant activities of MCP. Furthermore, high DS and moderate molecular weight could improve the antioxidant activities of polysaccharide. © 2013 Wiley Periodicals, Inc. Biopolymers 101: 210–215, 2014.     

川芎嗪对体外培养的胎鼠神经干细胞增殖和分化的影响

目的：探讨川芎嗪（TMP）在体外神经干细胞（NSCs）增殖与分化中的作用。方法：原代提取孕14 d雌性大鼠的胎鼠大脑皮层分离培养,并作免疫荧光染色鉴定,取传代培养第3代的NSCs进行实验。实验分为对照组、β-巯基乙醇阳性对照组、TMP诱导组和TMP+EGTA组（n=4）。采用BrdU法和MTT法观察川芎嗪对NSCs增殖数量的影响,采用蛋白免疫印迹法检测NSCs的分化表达情况。结果：实验成功分离纯化原代NSCs,培养3~5 d可见部分神经球形成,具备典型的NSCs形态并表达NSCs特异抗原巢蛋白;BrdU法和MTT法结果均显示,与对照组和β-巯基乙醇阳性对照组相比,TMP组NSCs增殖数量明显增多（P<0.05）;蛋白免疫印迹结果显示,TMP组和TMP+EGTA组NSCs的神经元分化率明显增高,TMP+EGTA组分化率增高更明显（P<0.05）。结论：TMP能显著增强NSCs的增殖和神经元分化率。减少细胞外Ca²⁺可促进TMP诱导NSCs向神经元分化,Ca²⁺信号在TMP诱导NSCs向神经元分化过程中起重要作用。     

枸杞多糖LBP－I的分离纯化及性质鉴定

枸杞多糖ＬＢＰ－Ｉ的分离纯化及性质鉴定何进梁运祥张声华（华中农业大学生命科学技术学院,武汉４３００７０）（华中农业大学食品科学技术系）Ｉｓｏｌａｔｉｏｎ,ｐｕｒｉｆｉｃａｔｉｏｎａｎｄｐｒｏｐｅｒｔｙｉｄｅｎｔｉｆｉｃａｔｉｏｎｏｆｐｏｌｙｓａｃｃｈ...