The precise mechanism underlying the effects of anti-CD4 antibody and calcium ions(Ca^(2+)) in peanut allergy remains unknown.C3 H/HeJ mice sensitized with peanut protein extract(PPE)were injected with anti-CD4 antibo...The precise mechanism underlying the effects of anti-CD4 antibody and calcium ions(Ca^(2+)) in peanut allergy remains unknown.C3 H/HeJ mice sensitized with peanut protein extract(PPE)were injected with anti-CD4 antibodies for 4 weeks.Stimulation with PPE increased the specific immunoglobulin E(IgE),cytokine,histamine,and mMcp-1 levels,upregulated decorin(Dcn)expression,induced Ca^(2+) inflow in the spleen,and augmented the expression of the transcription factors GATA-3 and Foxp3,which resulted in Th2 and Treg cell activation.Notably,the Ca^(2+) levels were positively correlated with the histamine,interleukin(IL)-4,IL-5,and IL-13 levels,and negatively correlated with IL-10 levels.However,administration of anti-CD4 antibodies markedly alleviated allergic symptoms,activated T cells,and reduced Ca^(2+) inflow,cytokine,histamine,mMcp-1,and the IgHG3,CXCLI2,MMP2 and FABP4 gene.Our results indicated that anti-CD4 antibodies can ameliorate PPE-induced allergy,which is probably related to the suppression of Ca^(2+) inflow,and inhibiting histamine,cytokine and IgHG3,CXCL12,MMP2,and FABP4,thus exerting a protective effect against PPEsensitized food allergy.展开更多
Objective To design and construct the eukaryotic expression vector which expresses Anti-CD3 ScFv-B7.1 fusion molecules and predict the biological characteristics, the rationality and feasibility of the spacer. Methods...Objective To design and construct the eukaryotic expression vector which expresses Anti-CD3 ScFv-B7.1 fusion molecules and predict the biological characteristics, the rationality and feasibility of the spacer. Methods To analyze the flexibility, Hoop & Woods hydrophilicity and the epitope of Anti-CD3 ScFv-B7.1 fusion molecule at secondary structure level by computer simulation utilizing the GoldKey software. Results By comparing with Anti-CD3 ScFv and B7.1 respectively, it shows that Anti-CD3 ScFv-B7.1 fusion molecules can form correct secondary structure with the linking of the spacer, the fusion does not change the original hydrophilicity and epitopes of both Anti-CD3 ScFv and B7.1, no new epitopes emerge; The spacer is flexible and shows low antigenicity. Conclusion The design of Anti-CD3 ScFv-B7.1 fusion molecule are rational and feasible, the expressed fusion protein could retain the maximum biological activity and the function of both Anti-CD3 ScFv and B7.1.展开更多
To evaluate the effect of anti-HER-2 × anti-CD3 bi-specific antibody（BsAb） on the growth of HER-2/neu-expressing human gastric carcinoma in vitro and in vivo, an MTT assay was carried out to test the inhibitive...To evaluate the effect of anti-HER-2 × anti-CD3 bi-specific antibody（BsAb） on the growth of HER-2/neu-expressing human gastric carcinoma in vitro and in vivo, an MTT assay was carried out to test the inhibitive rates of herceptin, anti-CD3 and BsAb antibodies on SGC-7901 gastric carcinoma cells. Immunocytochemistry methods were used to test the HER-2 level of SGC-7901. Nude mice models were employed to test the effect of HER-2 CD3 BsAh combined with effector ceils（ peripheral blood lymphatic cells of healthy human beings） on the growth of tumors in animals. Compared with that of the untreated control group, the tumor cell growth rates in vitro and in vivo will both be significantly inhibited when treated with effector cells combined with anti-CD3 McAb, herceptin or HER2 CD3 BsAb （p 〈0. 05）, and the growth inhibition is the most remarkable in the group treated with HER2 CD3 BsAb combined with effector cells. The growth of tumor xenografts will also be significantly inhibited in the group treated with HER2 CD3 BsAb combined with effector cells when compared with that in the group treated with anti-CD3 McAb or the group treated with herceptin combined with effector cells（p 〈0. 05）. We can conclude that HER-2/neu is possibly a useful target for immunotherapy of gastric carcinoma, and anti-HER2 × anti-CD3 BsAb has evident anti-tumor efficacy both, in vitro and in vivo.展开更多
目的探究抗B7-H3单克隆抗体(m Ab)在雨蛙肽诱导的急性胰腺炎(AP)中的作用。方法将小鼠随机分为对照组、AP组、抗B7-H3 m Ab治疗组。采用腹腔注射雨蛙肽的方法制备小鼠AP模型,治疗组于造模前1 h皮下注射抗B7-H3 m Ab,于造模后6、12、24 h...目的探究抗B7-H3单克隆抗体(m Ab)在雨蛙肽诱导的急性胰腺炎(AP)中的作用。方法将小鼠随机分为对照组、AP组、抗B7-H3 m Ab治疗组。采用腹腔注射雨蛙肽的方法制备小鼠AP模型,治疗组于造模前1 h皮下注射抗B7-H3 m Ab,于造模后6、12、24 h,收集各组小鼠血液、胰腺及肺组织。采用Western blot法和免疫组织化学染色检测对照组及AP组小鼠胰腺组织B7-H3蛋白表达。应用全自动生化免疫分析仪检测各组小鼠血清淀粉酶及脂肪酶活性;胰腺组织湿干比评估各组小鼠胰腺组织水肿变化;HE染色评估各组小鼠胰腺及肺组织病理变化,利用ELISA检测各组小鼠血清中肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)、IL-1β水平。结果 B7-H3蛋白在AP模型小鼠胰腺组织高表达,且在12 h左右达到高峰;AP组血清淀粉酶及脂肪酶明显高于对照组,抗B7-H3 m Ab处理后明显降低;AP组胰腺及肺组织出现明显炎症反应,治疗组炎症反应明显减弱,胰腺组织湿干比大幅降低;AP组TNF-α、IL-6、IL-1β水平随时间延长而升高,12 h达到高峰后开始下降,而治疗组促炎因子水平相对降低。结论 B7-H3在雨蛙肽诱导的AP模型中存在高表达,抗B7-H3 m Ab可以减弱炎症反应,缓解胰腺及肺组织的损伤。展开更多
基金supported by the National Natural Science Foundation of China(31972185)。
文摘The precise mechanism underlying the effects of anti-CD4 antibody and calcium ions(Ca^(2+)) in peanut allergy remains unknown.C3 H/HeJ mice sensitized with peanut protein extract(PPE)were injected with anti-CD4 antibodies for 4 weeks.Stimulation with PPE increased the specific immunoglobulin E(IgE),cytokine,histamine,and mMcp-1 levels,upregulated decorin(Dcn)expression,induced Ca^(2+) inflow in the spleen,and augmented the expression of the transcription factors GATA-3 and Foxp3,which resulted in Th2 and Treg cell activation.Notably,the Ca^(2+) levels were positively correlated with the histamine,interleukin(IL)-4,IL-5,and IL-13 levels,and negatively correlated with IL-10 levels.However,administration of anti-CD4 antibodies markedly alleviated allergic symptoms,activated T cells,and reduced Ca^(2+) inflow,cytokine,histamine,mMcp-1,and the IgHG3,CXCLI2,MMP2 and FABP4 gene.Our results indicated that anti-CD4 antibodies can ameliorate PPE-induced allergy,which is probably related to the suppression of Ca^(2+) inflow,and inhibiting histamine,cytokine and IgHG3,CXCL12,MMP2,and FABP4,thus exerting a protective effect against PPEsensitized food allergy.
文摘Objective To design and construct the eukaryotic expression vector which expresses Anti-CD3 ScFv-B7.1 fusion molecules and predict the biological characteristics, the rationality and feasibility of the spacer. Methods To analyze the flexibility, Hoop & Woods hydrophilicity and the epitope of Anti-CD3 ScFv-B7.1 fusion molecule at secondary structure level by computer simulation utilizing the GoldKey software. Results By comparing with Anti-CD3 ScFv and B7.1 respectively, it shows that Anti-CD3 ScFv-B7.1 fusion molecules can form correct secondary structure with the linking of the spacer, the fusion does not change the original hydrophilicity and epitopes of both Anti-CD3 ScFv and B7.1, no new epitopes emerge; The spacer is flexible and shows low antigenicity. Conclusion The design of Anti-CD3 ScFv-B7.1 fusion molecule are rational and feasible, the expressed fusion protein could retain the maximum biological activity and the function of both Anti-CD3 ScFv and B7.1.
文摘To evaluate the effect of anti-HER-2 × anti-CD3 bi-specific antibody（BsAb） on the growth of HER-2/neu-expressing human gastric carcinoma in vitro and in vivo, an MTT assay was carried out to test the inhibitive rates of herceptin, anti-CD3 and BsAb antibodies on SGC-7901 gastric carcinoma cells. Immunocytochemistry methods were used to test the HER-2 level of SGC-7901. Nude mice models were employed to test the effect of HER-2 CD3 BsAh combined with effector ceils（ peripheral blood lymphatic cells of healthy human beings） on the growth of tumors in animals. Compared with that of the untreated control group, the tumor cell growth rates in vitro and in vivo will both be significantly inhibited when treated with effector cells combined with anti-CD3 McAb, herceptin or HER2 CD3 BsAb （p 〈0. 05）, and the growth inhibition is the most remarkable in the group treated with HER2 CD3 BsAb combined with effector cells. The growth of tumor xenografts will also be significantly inhibited in the group treated with HER2 CD3 BsAb combined with effector cells when compared with that in the group treated with anti-CD3 McAb or the group treated with herceptin combined with effector cells（p 〈0. 05）. We can conclude that HER-2/neu is possibly a useful target for immunotherapy of gastric carcinoma, and anti-HER2 × anti-CD3 BsAb has evident anti-tumor efficacy both, in vitro and in vivo.
文摘目的探究抗B7-H3单克隆抗体(m Ab)在雨蛙肽诱导的急性胰腺炎(AP)中的作用。方法将小鼠随机分为对照组、AP组、抗B7-H3 m Ab治疗组。采用腹腔注射雨蛙肽的方法制备小鼠AP模型,治疗组于造模前1 h皮下注射抗B7-H3 m Ab,于造模后6、12、24 h,收集各组小鼠血液、胰腺及肺组织。采用Western blot法和免疫组织化学染色检测对照组及AP组小鼠胰腺组织B7-H3蛋白表达。应用全自动生化免疫分析仪检测各组小鼠血清淀粉酶及脂肪酶活性;胰腺组织湿干比评估各组小鼠胰腺组织水肿变化;HE染色评估各组小鼠胰腺及肺组织病理变化,利用ELISA检测各组小鼠血清中肿瘤坏死因子α(TNF-α)、白细胞介素6(IL-6)、IL-1β水平。结果 B7-H3蛋白在AP模型小鼠胰腺组织高表达,且在12 h左右达到高峰;AP组血清淀粉酶及脂肪酶明显高于对照组,抗B7-H3 m Ab处理后明显降低;AP组胰腺及肺组织出现明显炎症反应,治疗组炎症反应明显减弱,胰腺组织湿干比大幅降低;AP组TNF-α、IL-6、IL-1β水平随时间延长而升高,12 h达到高峰后开始下降,而治疗组促炎因子水平相对降低。结论 B7-H3在雨蛙肽诱导的AP模型中存在高表达,抗B7-H3 m Ab可以减弱炎症反应,缓解胰腺及肺组织的损伤。
