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1.
茶多酚抗突变和消除自由基作用的研究 总被引：6，自引：0，他引：6
采用Ｅ．ＣｏｌｉＳＯＳ显色法，小鼠骨髓细胞微核及染色体畸变试验和体外自由基消除实验等方法测定了茶多酚复合物（ＴＰ）的抗突变和消除自由基作用．结果表明：（１）ＴＰ的终浓度在２．５和５ｍｇ／ｍｌ时，对由阳性致突变物ＭＮＮＧ，ＥＭＳ和ＮａＮ＿３诱导的ＳＯＳ应答反应均具有明显的抑制作用；（２）小鼠每日ｉｇ４０、８０和１２０ｍｇ／ｋｇ剂量的ＴＰ能明显抑制由环磷酰胺（ＣＰ）诱发的骨髓ＰＣＥ的ＭＮＣＦ，三种剂量ＴＰ的抑制率分别为４０．９８％、６６．７６％和６５．９４％；（３）ＴＰ对ＭＭＣ诱发的骨髓细胞染色体畸变（ＣＡ）的抑制率分别为６２．５６％、５５．７１％和４７．９５％；（４）在Ｘ／ＸＯ－ＥＳＲ、Ｘ／ＸＯ／Ｌｕｍｉｎｏｌ－ＢＣＬ和ＩＲ／ＮＢＴ－ＳＰＭ三种模型中ＴＰ对超氧阴离子Ｏ＿２自由基均具有极强的消除作用，消除率分别为９８±６％、９８±１．２％和９５±１．５％，对Ｏ＿２的消除效率明显强于维生素Ｃ和Ｅ，对不同工艺制备的ＴＰ消除活性氧自由基作用的测定结果显示：脱咖啡碱程度高，ＥＧＣ和Ｌ－ＥＧＣＧ含量比例高的ＴＰ－３制剂消除Ｏ＿２的效率最高．因此，ＴＰ消除有害自由基，中断或终止自由基的氧化反应是抗突变，抗肿瘤作用的主要机制 相似文献
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采用甲基磺酸乙酯（ＥＭＳ）诱变草鱼吻端组织细胞（ＺＣ－７９０１）．用乌苯苷（Ｏｕａｂａｉｎ）筛选抗药性突变体．结果表明，ＥＭＳ对草鱼细胞的诱变效果与该药物对哺乳类细胞的诱变效果有明显差异．草鱼细胞对乌苯苷的敏感性也大大低于哺乳类细胞．ＺＣ－７９０１细胞在传代后２４ｈ，用浓度为２．８ｍｇ／ｍｌ的ＥＭＳ处理２４ｈ，诱变效果较理想，细胞杀伤率约３０％，这比通常用ＥＭＳ诱变哺乳类细胞所使用的浓度（０．４ｍｇ／ｍｌ）增大了７倍，存留下来的细胞用浓度为２５ｍｍｏｌ／Ｌ乌苯苷筛选抗性突变体，有少数细胞存活，并具有分裂增殖能力．但在细胞瓶内不易形成单层 相似文献
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氨基酸清除活性氧自由基作用的研究 总被引：22，自引：0，他引：22
分别采用Ｘ－ＸＯＤ－Ｌｕｍｉｎｏｌ的Ｏ２＾－产生模型和Ｖｃ－Ｃｕ＾２＋－Ｈ２Ｏ２－酵母多糖的ＯＨ产生体系，以还原型谷胱甙肽（ＧＳＨ）作为参照，用化学发光法研究了１９在酸对活性氧自由基的清除能力，证实了氨基酸普遍具有生物抗氧化活性，其抗Ｏ２＾－的有效浓度范围在１０＾－２￣１０＾－４ｍｏｌ／Ｌ，比ＧＳＨ高出二个数量级。 相似文献
5.
抗人甲胎蛋白（AFP）单克隆抗体的制备及其特性研究 总被引：2，自引：0，他引：2
采用亲和层析法纯化的ＡＦＰ抗原免疫的ＢＡＬＢ／ｃ鼠脾细胞与ＳＰ２／０小鼠骨髓瘤细胞系融合,获三株分泌抗人ＡＦＰ单克隆抗体（ＭｃＡｂ）的杂交瘤细胞系．用ＥＬＩＳＡ阻断试验和夹心ＥＬＩＳＡ试验作特异性鉴定,杂交瘤细胞株染色体的众数为１０４条,三株细胞系ＭｃＡｂ均属小鼠ＩｇＧ１型．经体外连续传代３个月及冻存一年复苏后均能持续分泌抗ＡＦＰ抗体 相似文献
6.
目的:研究苦豆子总碱(Total Alkaloids from Sophora Alopecuroides L,TASA)对滤泡辅助性T(follicular helper T cells, Tfh)细胞的作用。方法:将20只正常ICR小鼠随机分为TASA高剂量组、TASA中剂量组、TASA低剂量组和正常对照组,除正常对照组腹腔注射生理盐水外,其余三组分别行腹腔注射三个不同剂量的苦豆子总碱,连续15d。每天监测小鼠体重的变化,15d后颈脱臼处死各组小鼠,称量小鼠脾重,采用流式检测小鼠脾Tfh细胞的百分比。结果:苦豆子总碱对小鼠体重无明显影响,TASA高、中、低剂量组小鼠脾指数和Tfh细胞的百分比明显低于正常组。结论:苦豆子总碱具免疫抑制作用,其免疫抑制作用可能与调节脾指数和Tfh细胞有关。 相似文献
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最近发现睾丸中存在ＩＬ－Ｉ样物质，但其来源不明，作者用改良的Ｋｌｉｎｅｆｅｌｔｅｒ方法分离纯种大鼠睾丸Ｌｅｙｄｉｇ细胞，培养于含有人重组ＩＬ－１β的牛血清的ＤＥＭＥ／Ｆ１２培养基中，根据Ｃｈｏｍｃｚｙｎｓ－ｋｉ及Ｓａｃｄｃｈｉ方法，抽提全部细胞的ＲＮＡ，最后用Ｎｏｒｔｈｅｒｎ印迹分析发现ＩＬ－β导致Ｌｅｙｄｉｇ细胞中ＩＬ－１αｍＲＮＡ表达增加，且呈剂量依赖性，脂多糖亦刺激ＩＬ－１αｍＲＮＡ的表达，但佛波脂无此作用．结果表明Ｌｅｙｄｉｇ细胞为ＩＬ－Ｉ的主要来源，它具有自分泌和旁分泌效应． 相似文献
9.
以16个水稻品种为材料，测定了铜对水稻种子萌发相关指标，并观察了根尖有丝分裂及分生区Ca分布的影响。结果表明：（1）0．1mM和0．2mMCuSO4溶液处理对水稻根长的抑制作用大于对芽长的抑制，且对不同品种根长的抑制作用存在明显差异；（2）随着铜处理浓度（25、50、75、100μM）的升高，根尖细胞有丝分裂指数及相对有丝分裂指数皆呈下降趋势；（3）t常生长条件下，水稻根尖分生区细胞中的Ca主要分布在液泡和细胞间隙中，而细胞质、细胞核中分布很少；50μM铜处理下，根尖分生区细胞液泡和胞间的Ca沉淀颗粒明显减少，而胞质及核基质中的Ca沉淀颗粒增多。铜胁迫造成根尖细胞中原有Ca分布的变化可能是引起细胞功能的紊乱，进而影响根系生长的原因之一。 相似文献
10.
白细胞介素1β对大鼠海马神经元电压门控钠离子通道的影响 总被引：3，自引：0，他引：3
白细胞介素-1β(IL-1β)及受体表达增加可见于脑缺血、外伤和退行性病变等多种病理情况，而对IL-1β作为中枢神经系统信号物质的作用及其机制知之甚少．本实验采用全细胞电压钳记录，研究了不同浓度的IL-1β对急性分离大鼠海马锥体细胞Na’电流的调制作用．实验结果如下：1)IL-1β(0．1ng／mL)使Na^ 电流峰值增加，但对离子通道动力学无显著影响；2)IL-1β(10ng／mL)对海马神经元电压门控钠通道具有抑制作用，并使Na^ 通道开放阈值提高．实验结果提示：1)中枢神经系统中存在的IL-1β基础分泌可以通过电压门控Na^ 离子通道参于神经元兴奋性调节；2)IL-1β水平的异常增加对Na^ 通道具有抑制作用，对防止损伤导致的神经元去极化具有积极意义． 相似文献
11.
Xue Wang Yuetong Wang Zhaoyuan Fang Hua Wang Jian Zhang Longfu Zhang Hsinyi Huang Zhonglin Jiang Yujuan Jin Xiangkun Han Shenda Hou Bin Zhou Feilong Meng Luonan Chen Kwok-Kin Wong Jinfeng Liu Zhiqi Zhang Xin Zhang Haiquan Chen Yihua Sun Liang Hu Hongbin Ji 《国家科学评论(英文版)》2021,8(10)
Somatic mutations of the chromatin remodeling gene ARID2 are observed in ∼7% of human lung adenocarcinomas (LUADs). However, the role of ARID2 in the pathogenesis of LUADs remains largely unknown. Here we find that ARID2 expression is decreased during the malignant progression of both human and mice LUADs. Using two KrasG12D-based genetically engineered murine models, we demonstrate that ARID2 knockout significantly promotes lung cancer malignant progression and shortens overall survival. Consistently, ARID2 knockdown significantly promotes cell proliferation in human and mice lung cancer cells. Through integrative analyses of ChIP-Seq and RNA-Seq data, we find that Hspa1a is up-regulated by Arid2 loss. Knockdown of Hspa1a specifically inhibits malignant progression of Arid2-deficient but not Arid2-wt lung cancers in both cell lines as well as animal models. Treatment with an HSPA1A inhibitor could significantly inhibit the malignant progression of lung cancer with ARID2 deficiency. Together, our findings establish ARID2 as an important tumor suppressor in LUADs with novel mechanistic insights, and further identify HSPA1A as a potential therapeutic target in ARID2-deficient LUADs. 相似文献
12.
Subcutaneous administration of monosodium glutamate (MSG), to normal adult male mice, for six consecutive days at dose levels
of 4 and 8 mg/g body weight, significantly increased the level of free radical initiating enzyme, xanthine oxidase, whereas
the activity of free radical scavenging enzymes, like catalase and superoxide dismutase was significantly decreased in hepatic
tissue. These observations suggested that ingestion of MSG at dose level of 4 mg/g body weight and above, induced oxidative
stress in the hepatic tissue of adult male mice. 相似文献
13.
建立小鼠顺铂耳毒性模型,研究不同剂量的顺铂对小鼠耳蜗中Calpain表达水平的影响。将70只成年BALB/c小鼠随机分成4组,用不同剂量的顺铂进行干预后,通过听脑干反应测试用药前后小鼠听力的变化;应用Western blot以及免疫荧光检测耳蜗中Calpain的表达。不同剂量顺铂组小鼠的体重和听力明显下降,随着给药时间的增加,Calpain1在耳蜗中的表达水平逐渐减弱,而Calpain2在耳蜗中的表达水平逐渐增强。应用顺铂可建立小鼠耳毒性模型;正常小鼠耳蜗中存在Calpain1和Calpain2的表达,并且calpain2与顺铂所致的耳毒性相关。 相似文献
14.
采用不同剂量的天然防腐保鲜剂给小鼠灌胃，造成小鼠急性中毒。用组织病理学及组织化学方法观察小鼠肝组织的结构变化。实验结果表明用药组小鼠肝细胞明显变性，肝血窦扩张变窄，肝细胞肿胀，呈明显的空泡状。ＰＡＳ反应显示肝细胞内有超常量的肝糖原累积。 相似文献
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Govinda Rao Duddukuri Y. Vasudeva Rao D. N. Rao Rao R Athota 《Indian journal of clinical biochemistry : IJCB》2001,16(1):89-94
It was reported earlier that intraperitoneal administration of honey had immunosuppressive activity on elicitation of allergen-specific
murine antibody response as evaluated by passive cutaneous anaphylaxis and double immunodiffusion methods. In this study,
the immunomudulatory effect of honey is evaluated by enzyme linked immunosorbent assay (ELISA) using ovalbumin as model allergen.
It was found that ovalbumin (OVA)-specific IgG antibody responses elicited with various doses of OVA were significantly suppressed
by rock bee honey (p<0.01). Honey was also found to have inhibited the production of OVA-specific IgM, IgA, IgG1, and IgG2b whereas that of IgG2a and IgG3 were not affected. Furthermore, honey also suppressed the OVA-specific total IgG antibody response in various inbred mice
with different genetic background. In addition, the suppressive activity of honey was examined in different groups of mice
by injecting honey at different time intervals, before and after immunization with OVA. The anti-OVA IgG antibody response
was suppressed significantly when honey was injected 12 hours prior/latter to OVA injection. These results confirm the suppressive
activity of honey on antibody response and suggest possible clinical application. 相似文献
16.
Shanmugam Velayuthaprabhu Arunachalam Chinnathambi Sulaiman Ali Alharbi Hidehiko Matsubayashi Govindaraju Archunan 《Indian journal of clinical biochemistry : IJCB》2017,32(3):347-352
To investigate the effects of antiphospholipid antibodies on establishment of pregnancy and changes in hormones such as estradiol-17ß (E2) and progesterone (P) levels in circulation. Hence, mice were immunized with human β2-Glycoprotein I (β2GPI) and the effect of these antibodies on fetuses weight, placental obsrvation, Serum levels of P and E2 in pregnant mice, hematological were observed. Immunization of mice with human β2-GPI resulted in elevated levels of antiphospholipid antibodies. The experimentally induced antiphospholipid syndrome mouse showed higher rate of fetal resorption, low number of viable fetuses, and “placental abnormalities”. In these animals, serum E2 and P levels were reduced significantly. In addition, the blood cell variation among APS induced and control mice were determined. No significant variations were observed in number of Red Blood Cell count, White Blood Cell count and Hemoglobin content, while platelet number was significantly reduced as compared to control. These results clearly demonstrate that human β2-GPI might be involved in causing gestational failure in APS by exerting their effect on serum hormones. 相似文献
17.
Namdev S. Togre Priyanka S. Bhoj Vishal K. Khatri Aditya Tarnekar Kalyan Goswami Moreshwar R. Shende M. V. R. Reddy 《Indian journal of clinical biochemistry : IJCB》2018,33(3):282-289
Helminthic infections lead to the release of various molecules which play an important role in modulation of the host immune system. Such filarial proteins with immunomodulatory potential can be used for therapeutic purpose in inflammatory and immune mediated diseases. In the present study, we have explored the prophylactic effect of filarial SXP–RAL family protein of Wuchereria bancrofti i.e. rWbL2 protein in DSS induced inflammatory ulcerative colitis in a mouse model. Prior treatment of rWbL2, followed by induction of colitis, showed significantly reduced disease severity as indicated by the decreased disease manifestations and improved macroscopic and microscopic inflammation. This preventive effect was found to be associated with increased release of anti-inflammatory cytokine IL-10 and decreased release of proinflammatory cytokines IFN-γ, TNF-α, IL-6 and IL-17 by the splenocytes of treated mice. From this study, it can be envisaged that pretreatment with filarial protein, rWbL2, can prevent the establishment of ulcerative colitis in BALB/c mice. The underlying immunological mechanism may involve the up-regulation of Th2 immune response with down-regulation of Th1 response. 相似文献
18.
Manish K. Singh Shailendra Dwivedi Suraj S. Yadav Praveen Sharma Sanjay Khattri 《Indian journal of clinical biochemistry : IJCB》2014,29(1):29-37
Arsenic a metalloid and environmental contaminated has been found to be associated with public health problems in the affected areas. It is naturally occurred in groundwater and its accumulation in plant and animals leads to toxicity in several tissues most notably hepatic organ. Arsenic exposures (3 mg/kg body weight/day for 30 days) in mice exhibited increased arsenic and Zn levels in hepatocytes associated with enhanced oxidative stress in hepatocytes while there were no significantly changes were observed in Cu level. An increase in the lipid peroxidation and decrease in the levels of reduced glutathione and activity of superoxide dismutase, catalase, and glutathione peroxidase were observed in arsenic treated mice as compared to controls. Arsenic exposure in mice also caused a significant change in serum biomarkers in the SGOT, SGPT and creatinine as compared to the controls. There were no significant changes in the serum levels of total protein in these mice. Co-administration of arsenic and fruit extract of amla (500 mg/kg body weight/day for 30 days) caused a significant reduction of arsenic transference associated with significantly decreases hepatic arsenic levels and balanced the antioxidant enzyme and levels of serum hepatic enzymes like SGOT and SGPT. The results of the present study clearly demonstrate the antioxidant property of amla that could be responsible for its protective efficacy in arsenic induced hepatic toxicity. 相似文献
19.
定期给荷瘤小鼠注射或灌服一定剂量浓度的绞股蓝浸出液后,小鼠体质增强,胸腺的萎缩速度减慢,每克体重的胸腺和脾脏重均显著高于对照组.胸腺与脾脏每克重细胞数增多.每克体重的瘤重明显降低,瘤细胞数减少,取荷瘤小鼠胸腺淋巴细胞与瘤细胞离体混合培养后,被致敏的淋巴细胞的“粘瘤”和“钻瘤”作用加强,癌细胞发生轻度皱缩,淋巴细胞钻入的癌细胞发生裂解,碎片逐渐增多,而淋巴细胞的形态和数量无变化.实验结果表明:纹股蓝浸出液具有增强荷瘤小鼠免疫力和抑制;肿瘤生长的作用。 相似文献
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以遗传性非胰岛素依赖型糖尿病ＫＫ小鼠为动物模型,研究钒对雌雄性糖尿病小鼠的降糖作用．实验选择３周龄的ＫＫ小鼠,雌雄各半,通过自由饮水方式给予雌雄性小鼠０ｍｇ/Ｌ、０.１ｍｇ/Ｌ和１００ｍｇ/Ｌ的钒酸铵,实验周期为１７周,观察不同剂量钒酸铵对血糖、甘油三酯和总胆固醇代谢的影响．研究结果表明,０１ｍｇ?Ｌ钒酸铵对雌雄性小鼠的血糖水平和血液生化指标没有明显的影响,高剂量钒酸铵（１００ｍｇ?Ｌ）明显降低雄性糖尿病小鼠的饮水量、血糖水平、糖基化血红蛋白、甘油三酯和总胆固醇等,葡萄糖耐量水平得到显著改善,对糖尿病小鼠的肝肾功能没有影响．结果提示钒酸铵对雌性小鼠和雄性小鼠具有降血糖作用,其作用效果有明显的性别差异． 相似文献