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1.
The immune reaction as a stimulator of tumor growth 总被引：13，自引：0，他引：13
R T Prehn 《Science (New York, N.Y.)》1972,176(31):170-171
Various numbers of spleen cells from specifically immunized mice were mixed with constant numbers of target tumor cells, and were inoculated subcutaneously into thymectomized, x-irradiated recipients. Small numbers of admixed immune spleen cells produced a statistically significant, and reproducible, acceleration of tumor growth in the inoculum as compared with controls of either nonimmune spleen cells or spleen cells from animals immune to a different, non-cross-reacting, tumor. Larger. numbers of specifically immune spleen cells, however, produced inhibition of tumor growth. These data imply that the normal immune reaction may have a dual function in relation to neoplasia: (i) stimulation of tumor growth, early in the course of the disease, or whenever the immune reaction is minimal; (ii) inhibition of tumor growth at other times. 相似文献
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Specific inhibition of migration of spleen cells from C57B1/6J mice, which had rejected A/J sarcoma-1 tumors, occurred in the presence of A/J lymph mode antigens. The migration inhibitory effect was transferable to normal C57B1/6J spleen cells by RNA extracted from lymph nodes and spleens of immunized animals. 相似文献
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通过对白木通(A kebia trifoliata subsp.australis)茎藤和果实的皂苷、多糖和水提液等提取物饲养小白鼠,分别测定10 d后小白鼠的脾脏指数、胸腺指数、血浆白细胞总教、中性杆状白细胞、中性分叶白细胞、淋巴细胞、单核细胞百分率,同时还测定了小白鼠血液、肝、脑组织中蛋白质、MDA含量和SOD活性,探讨白木通茎藤和果实提取物对小白鼠活血通脉的效果.结果表明,白木通茎藤水提液明显提高了小白鼠的脾脏指数,效果显著优于果实多糖和果实皂苷；茎藤多糖显著提高小白鼠肝、脑组织中的SOD活性；白木通茎藤和果实提取物对小白鼠白细胞总数没有影响,但白木通果实皂苷能极显著地提高小白鼠淋巴细胞百分比. 相似文献
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[目的]研究蒲黄醇提物对C57BIM6荷瘤小鼠免疫功能影响。[方法]通过建立Lewis肺癌小鼠移植瘤动物模型,以抑瘤率为指标考察蒲黄醇提物的体内抗肿瘤活性,分别测定其抑瘤率、胸腺指数和脾脏指数;四氮唑盐（MTY）法对荷瘤小鼠脾淋巴细胞增殖活性进行测定;ELISA法测定荷瘤小鼠血清中白细胞介素一2（IL-2）、肿瘤坏死因子-a（TNF-a水平。[结果]蒲黄醇提取物100mg／kg·d组对肿瘤生长有明显的抑制作用（P〈0．01）,其抑瘤率为48．3％,蒲黄醇提物三个剂量组均能提高荷瘤小鼠的胸腺指数和脾脏指数。同时100和200mg／kg·d组能显著提高荷瘤小鼠脾淋巴细胞的增殖能力和荷瘤小鼠血清中IL-2、TNF—ol的水平。[结论]蒲黄醇提物具有提高荷瘤小鼠体液免疫和细胞免疫的作用。 相似文献
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Humoral immunosuppressive substance in mice bearing plasmacytomas 总被引：10，自引：0，他引：10
The mechanism by which plasmacytomas (PC) depress the primary immune response to sheep red cells was investigated by determining the ability of normal spleen cells to produce antibody when enclosed in Millipore chambers and implanted in PC-bearing mice. Chamber-enclosed normal spleen cells implanted in PC-bearing mice responded poorly to the sheep red cells when compared to similar cells enclosed in chambers and implanted in normal mice or in mice with other lymphoid and nonlymphoid tumors. The data suggest that PC-induced immune suppression is mediated by a humoral factor. 相似文献
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Thymus-derived lymphocytes: humoral and cellular reactions distinguished by hydrocortisone 总被引：16，自引：0，他引：16
Lymphocytes derived from the thymus (T cells) take part in the induction of humoral antibody and also effect cell-mediated graft-versus-host reactions. Preliminary treatment of mice with hydrocortisone caused an inhibition of T-cell function in humoral immunity, while enhancing the graft-versus-host reactivity of the same population of spleen cells. This suggests that different types of T cells participate in cellular and humoral immune reactions. 相似文献
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Antibody-dependent lymphoid cell-mediated cytotoxicity: no requirement for thymus-derived lymphocytes 总被引：49，自引：0，他引：49
The capacity of lymphoid cells from nonsensitized mice to lyse antibody-coated target erythrocytes in vitro does not require the presence of thymus-derived or thymus-dependent lymphocytes. Thus, spleen cells from thymus-deprived mice and spleen cell populations from which thymus-dependent lymphocytes had been removed were fully competent to mediate destruction of antibody-coated target cells. However, prior treatment of spleen cell populations with antibody to kappa chains diminished this function, suggesting a role for bone marrow-derived lymphocytes. 相似文献
11.
齐艳萍 《黑龙江八一农垦大学学报》2012,24(1):55-57
为了探讨鹿茸对小鼠肿瘤的抑制作用,利用S180肉瘤和H22荷瘤瘤株建立小鼠肿瘤模型,并将小鼠随机分为空白组、模型组、鹿茸大剂量组、鹿茸中剂量组、鹿茸小剂量组、环磷酰胺（CTX）组,每组10只。其中空白对照组和模型组小鼠每天以生理盐水灌胃,CTX对照组和鹿茸（大、中、小剂量）灌胃组则灌胃相应药物,以观察实验各组的抑瘤效果和脾、胸腺指数。结果显示,鹿茸可以提高小鼠的抑瘤率,其抑制效果与剂量成正比,并可以从器官水平上增强小鼠的免疫力,从而间接达到抗肿瘤效果。 相似文献
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[目的]观察魟鱼软骨多糖对小鼠免疫器官胸腺和脾脏重量的影响以及脾脏组织细胞IL-2、IL-6、IFN-γ细胞因子的表达水平。[方法]腹腔注射环磷酰胺（CY）造成小鼠免疫抑制模型,以香菇多糖为阳性对照,魟鱼软骨多糖（低、中、高剂量）,灌胃给药14 d,试验结束后称量胸腺和脾脏重量计算胸腺指数和脾指数,检测脾脏中细胞因子的表达情况：运用抗原对应抗体进行免疫组化SP法检测脾中IL-2、IL-6、IFN-γ细胞因子的表达水平。[结果]魟鱼软骨多糖能显著提高小鼠胸腺和脾脏重量,能拮抗环磷酰胺导致的免疫抑制,升高脾脏中细胞因子的表达水平从而提高机体的免疫功能。[结论]魟鱼软骨多糖对小鼠的免疫功能具有一定的调节作用,是一种良好的免疫调节剂。 相似文献
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Rosas-Ballina M Olofsson PS Ochani M Valdés-Ferrer SI Levine YA Reardon C Tusche MW Pavlov VA Andersson U Chavan S Mak TW Tracey KJ 《Science (New York, N.Y.)》2011,334(6052):98-101
Neural circuits regulate cytokine production to prevent potentially damaging inflammation. A prototypical vagus nerve circuit, the inflammatory reflex, inhibits tumor necrosis factor-α production in spleen by a mechanism requiring acetylcholine signaling through the α7 nicotinic acetylcholine receptor expressed on cytokine-producing macrophages. Nerve fibers in spleen lack the enzymatic machinery necessary for acetylcholine production; therefore, how does this neural circuit terminate in cholinergic signaling? We identified an acetylcholine-producing, memory phenotype T cell population in mice that is integral to the inflammatory reflex. These acetylcholine-producing T cells are required for inhibition of cytokine production by vagus nerve stimulation. Thus, action potentials originating in the vagus nerve regulate T cells, which in turn produce the neurotransmitter, acetylcholine, required to control innate immune responses. 相似文献
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Murine lymphoma-induced immunosuppression: requirement for direct tumour cell contact 总被引：2，自引：0，他引：2
The FBL-3 lymphoma cell line caused impaired antibody formation in vivo when injected into mice intraperitoneally, and in vitro when added to normal syngeneic spleen cells immunized in vitro with sheep erythrocytes. Immunosuppression occurred only when intact viable tumor cells were cocultivated with the normal spleen cells. As few as 10(5) FBL-3 cells, when added to 5 X 10(6) normal cells, impaired antibody formation. However, cell-free extracts of filtrates from even much larger numbers of tumor cells did not affect antibody formation, either in vitro or in vivo. Heating the tumor cells at 56 degrees C or irradiation with as little as 1000 rads completely abolished immunosuppressive activity, both in vitro and in vivo. Separation of viable tumor cells from target antibody-forming cells by cell-impermeable membranes prevented immunosuppression, showing that direct cell-to-cell contact is required for immunosuppression. 相似文献
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小鼠实验性小花棘豆中毒的病理学观察 总被引：2，自引：0，他引：2
将40只小鼠随机分为4组,即对照组、试验Ⅰ组、试验Ⅱ组和试验Ⅲ组,3个试验组分别按照每千克体重1、5、10 g的剂量饲喂小花棘豆,63 d后采集小鼠心、肾、肝、脾、肺、脑等组织器官进行病理组织学检查,并计算脏器系数。结果显示,小花棘豆中毒可导致小鼠肝脏系数、肾脏系数和肺脏系数增大,脑系数、心脏系数和脾脏系数降低,部分组间差异显著或极显著(P0.05或P0.01);镜检发现小花棘豆中毒小鼠大脑、小脑、肾脏、肝脏、脾脏等组织细胞空泡变性,部分神经细胞肿胀,胞浆空泡化,且HE染色变淡。结果表明,小花棘豆中毒对小鼠组织器官有显著影响,并呈现出一定的时间和剂量效应关系,小花棘豆中毒可引起机体组织器官广泛性的病理损伤。 相似文献
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研究了磺胺喹噁啉对小鼠的急性毒性作用。采用改良寇氏法测定小鼠口服磺胺喹噁啉的LD50。将小鼠随机分为5组,分别灌服不同剂量的磺胺喹噁啉和生理盐水。观察小鼠灌服不同剂量磺胺喹噁啉后的临床症状以及小鼠腹腔巨噬细胞吞噬鸡红细胞的吞噬活性,测定脏器指数。结果表明,磺胺喹噁啉对小鼠口服的LD50为4889.90 mg/kg,95%可信限为5471.71~4308.09 mg/kg。磺胺喹噁啉中毒后,小鼠巨噬细胞吞噬鸡红细胞的能力降低,心脏指数和脾脏指数降低,肝脏指数和肾脏指数升高。主要病理变化为心脏色泽暗淡,心肌纤维肿胀;肝脏和肾脏明显肿大,肾小管上皮细胞肿胀变性,部分肾小管上皮细胞破裂;脾脏肿大,脾小体萎缩,淋巴细胞减少。研究结果说明,小鼠磺胺喹噁啉中毒后,非特异性免疫功能活性降低,心脏、肝脏、脾脏和肾脏等主要器官都受到一定程度的损害。 相似文献
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Neonatal thymectomy results in a repertoire enriched in T cells deleted in adult thymus 总被引：15，自引：0，他引：15
In B6AF1 mice, T lymphocytes that use the V beta 11-positive (and not V beta 6-positive or V beta 8-positive) segment in their receptor for antigen are greatly reduced in the thymus and peripheral lymphoid tissues, most likely as a result of clonal deletion. The relative number of V beta 11-positive cells in adult lymph nodes was ten times as high in B6AF1 mice thymectomized 1 to 4 days after birth as in normal mice. Moreover, for the first 10 days of life of B6AF1 mice, mature V beta 11-positive T cells were readily detected in the thymus and spleen. Thus neonatal thymectomy results in the maintenance of the receptor repertoire of early postnatal life, and this correlates with the subsequent development of organ-specific autoimmune diseases. 相似文献
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钙调蛋白(CaM)作为重要的抗逆信号转导蛋白,在调控木薯抗逆境和块根采后生理腐烂中起重要作用,为给快速检测木薯在不同生长环境中CaM蛋白的表达水平提供优良抗体,克隆木薯CaM基因并将目的基因插入原核表达载体,经Escherichia coli表达并纯化,用纯化的融合蛋白ACP-CaM免疫Balb/C小鼠,间接ELISA测定小鼠血清效价后,取小鼠脾细胞与SP2/0细胞融合,筛选能产生抗CaM单克隆抗体的杂交瘤细胞株,用Western blot、ELISA等方法对制备的单克隆抗体进行初步鉴定。Western blot分析结果显示原核表达重组质粒在E.coli中能高效表达CaM,免疫小鼠后取效价高的2#小鼠脾细胞和SP2/0细胞融合,共获得7株效价均达到106以上、能稳定分泌抗CaM抗体的细胞株,这7株单抗与淀粉磷酸化酶、His、BSA均无交叉反应,4D5株与标签蛋白ACP有交叉反应,表明其余6株均为CaM特异性抗体;抗体亚型鉴定结果显示7株单抗均为IgG型抗体。 相似文献
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Focal antibody production by transferred spleen cells in irradiated mice 总被引：18，自引：0，他引：18
Lethally irradiated mice were injected with small numbers of normal spleen cells and then immunized with sheep erythrocytes. Antibody activity was found in their spleens in localized areas whose number corresponded to the number of spleen cells injected. When sheep and pig erythrocytes were injected together, antibody against each was found in separate areas. Each area may consist of the progeny of a single precursor cell, restricted to forming a single antibody. 相似文献