Cancer occurrence and development has been demonstrated to be associated with escape from immune surveillance, and low eostimulatory molecules expression has been considered as one of the important reasons for cancer ...Cancer occurrence and development has been demonstrated to be associated with escape from immune surveillance, and low eostimulatory molecules expression has been considered as one of the important reasons for cancer evading the immune system. 4-1BB （CD137） is a costimulatory molecule expressed on the surface of activated T cells. Interaction of 4-1BB with its natural ligand （4-1BBL） expressed on antigen presenting cells （APCs） has been shown to amplify T-cell mediated immunity. We therefore examined whether murine cancer cells expressing 4-1BBL could produce antitumor effects in inoculated mice. Mouse forestomach carcinoma （MFC） cells were transfected with 4-1BBL gene （MFC/4-1BBL）. The proliferation of the transduced cells in vitro was not different from that of parental cells. However, MFC/4-1BBL cells developed small tumors and induced higher cytotoxicity of tumor infiltration lymphocyte （TIL）. Production of cytokines （IFN-γ TNF-α and IL-2） in serum and cytotoxic T lymphocyte （CTL） activity of splenocytes from mice immunized with mitomycin C （MMC）-treated MFC/4-1BBL cells were significantly higher than that from mice immunized with MMC-treated parental MFC and MFC/ pMKITneo cells. These results suggest that modification of cancer cells with 4-1BBL gene can produce antitumor immune responses.展开更多
Artificial antigen-presenting cells are expected to stimulate the expansion and acquisition of optimal therapeutic features of T cells before infusion. Here CD32 that binds to a crystallizable fragment of IgG monoclon...Artificial antigen-presenting cells are expected to stimulate the expansion and acquisition of optimal therapeutic features of T cells before infusion. Here CD32 that binds to a crystallizable fragment of IgG monoclonal antibody was genetically expressed on human K562 leukemia cells to provide a ligand for T-cell receptor. CD86 and 4-1BBL, which are ligands of co-stimulating receptors of CD28 and 4-1BB, respectively, were also expressed on K562 cells. Then we accomplished the artificial antigen-presenting cells by coupling K32/CD86/4-1BBL cell with OKT3 monoclonal antibody against CD3, named K32/CD86/4-1BBL/OKT3 cells. These artificial modified cells had the abilities of inducing CD8^＋ T cell activation, promoting CD8^＋ T cell proliferation, division, and long-term growth, inhibiting CD8^＋ T cell apoptosis, and enhancing CD8^＋ T cell secretion of IFN-T and perforin. Furthermore, antigen-specific cytotoxic T lymphocytes could be retained in the culture stimulated with K32/CD86/4-1BBL/OKT3 cells at least within 28 days. This approach was robust, simple, reproducible and economical for expansion and activation of CD8^＋ T cells and may have important therapeutic implications for adoptive immunotherapy. Cellular ＆ Molecular Immunology.展开更多
Human immunodeficiency virus type-1 （HIV-1）-specific dendritic cell （DC） vaccines have been used in clinical trials. However, they have been found to only induce some degree of immune responses in these studies. W...Human immunodeficiency virus type-1 （HIV-1）-specific dendritic cell （DC） vaccines have been used in clinical trials. However, they have been found to only induce some degree of immune responses in these studies. We previously demonstrated that the HIV-1 Gag-specific Gag-Texo vaccine stimulated Gag-specific effector CD8＋ cytotoxic T lymphocyte （CTL） responses, leading to completely protective, but very limited, therapeutic immunity. In this study, we constructed a recombinant adenoviral vector, adenovirus （AdV）4-1BBL, which expressed mouse 4-1BB ligand （4-1BBL）, and generated transgenic 4-1BBL-engineered OVA-Texo/4.1BSL and Gag-Texo/4.1BSL vaccines by transfecting ovalbumin （OVA）-Texo and Gag-＇rexo cells with AdV4.1BBL, respectively. We demonstrate that the OVA-specific OVA-Texo/4.ZSSL vaccine stimulates more efficient OVA-specific CTL responses （3.26%） compared to OVA-Texo-activated responses （1.98%） in wild-type C57BIJ6 mice and the control OVA-TeXO/Nu, vaccine without transgenic 4-1BBL expression, leading to enhanced therapeutic immunity against 6-day established OVA-expressing B16 melanoma BL6-1OovA cells. OVA-Texo/4.1BBL-stimulated CTLs, which have a CD44＋CD62Lhigh IL-7R＋ phenotype, are likely memory CTL precursors, demonstrating prolonged survival and enhanced differentiation into memory CTLs with functional recall responses and long-term immunity against BL6-1OovA melanoma. In addition, we demonstrate that OVA-Texo/4_ZBBL-Stimulated CTLs up- and downregulate the expression of anti-apoptosis （Bcl2110, Naipl, No13, Pak7 and Tnfrsfllb） and pro-apoptosis （Casp12, Trp63 and Trp73） genes, respectively, by RT2 Profiler PCR array analysis. Importantly, the Gag-specific Gag-Texo/4.1BBL vaccine also stimulates more efficient Gag-specific therapeutic and long-term immunity against HLA-A2/Gag-expressing B 16 melanoma BL6-1OGag/A2 cells than the control Gag-TeXO/NuH vaccine in transgenic HLA-A2 mice. Taken together, our novel Gag-Texo/4-ZBBL vaccine, which is capable of st展开更多
目的探讨共刺激分子4-1BB/4-1BBL在过敏性紫癜性肾炎(HSPN)患儿外周血单个核细胞(PBMC)中的表达及其临床意义。方法选取初发过敏性紫癜无肾炎(HSP组)、初发过敏性紫癜性肾炎(HSPN组)患儿各20例(其中15例进行了肾脏病理检查),20例正常儿...目的探讨共刺激分子4-1BB/4-1BBL在过敏性紫癜性肾炎(HSPN)患儿外周血单个核细胞(PBMC)中的表达及其临床意义。方法选取初发过敏性紫癜无肾炎(HSP组)、初发过敏性紫癜性肾炎(HSPN组)患儿各20例(其中15例进行了肾脏病理检查),20例正常儿童为对照组,分离培养PBMC。应用逆转录-聚合酶链式反应(RT-PCR)检测并比较三组PBMC中4-1BB m RNA和4-1BBL m RNA的变化,分析4-1BB/4-1BBL m RNA变化与肾脏病理的关系。结果HSPN、HSP患儿PBMC中4-1 BB m RNA、4-1 BBL m RNA的表达均高于对照组,差异有统计学意义(P均<0.01)。HSPN患儿的病理积分与4-1BB/4-1BBL m RNA表达呈正相关关系(r=0.570、0.515,P均<0.05)。PBMC中,加入植物血凝素后,HSPN组、HSP组和对照组4-1 BB/4-1 BBL m RNA的表达均高于空白对照组,差异有统计学意义(P均<0.01),其中HSP、HSPN组增高幅度较对照组明显,HSPN组增高幅度较HSP组更为显著,差异有统计学意义(P均<0.01);加入地塞米松后,HSPN组、HSP组4-1 BB/4-1 BBL m RNA的表达均较空白对照组减少,差异有统计学意义(P均<0.01)。结论 HSPN患儿PBMC中共刺激分子4-1BB/4-1BBL m RNA的表达显著增高,植物血凝素能诱导其高表达,而地塞米松能抑制其表达,提示4-1BB/4-1BBL可能参与HSPN的发病。展开更多
基金a grant from Hebei Provincial Department of Educationa grant from Hebei Provincial Department of Science and Technology (06276102D-95)
文摘Cancer occurrence and development has been demonstrated to be associated with escape from immune surveillance, and low eostimulatory molecules expression has been considered as one of the important reasons for cancer evading the immune system. 4-1BB （CD137） is a costimulatory molecule expressed on the surface of activated T cells. Interaction of 4-1BB with its natural ligand （4-1BBL） expressed on antigen presenting cells （APCs） has been shown to amplify T-cell mediated immunity. We therefore examined whether murine cancer cells expressing 4-1BBL could produce antitumor effects in inoculated mice. Mouse forestomach carcinoma （MFC） cells were transfected with 4-1BBL gene （MFC/4-1BBL）. The proliferation of the transduced cells in vitro was not different from that of parental cells. However, MFC/4-1BBL cells developed small tumors and induced higher cytotoxicity of tumor infiltration lymphocyte （TIL）. Production of cytokines （IFN-γ TNF-α and IL-2） in serum and cytotoxic T lymphocyte （CTL） activity of splenocytes from mice immunized with mitomycin C （MMC）-treated MFC/4-1BBL cells were significantly higher than that from mice immunized with MMC-treated parental MFC and MFC/ pMKITneo cells. These results suggest that modification of cancer cells with 4-1BBL gene can produce antitumor immune responses.
基金the National Natural Science Foundation of China（No.30400399,No.30671917）the Natural Science Fund of Jiangsu Province（BK2004404） the Natural Science Fund of the Educational Committee of Jiangsu Province（04KJB320162） in China.
文摘Artificial antigen-presenting cells are expected to stimulate the expansion and acquisition of optimal therapeutic features of T cells before infusion. Here CD32 that binds to a crystallizable fragment of IgG monoclonal antibody was genetically expressed on human K562 leukemia cells to provide a ligand for T-cell receptor. CD86 and 4-1BBL, which are ligands of co-stimulating receptors of CD28 and 4-1BB, respectively, were also expressed on K562 cells. Then we accomplished the artificial antigen-presenting cells by coupling K32/CD86/4-1BBL cell with OKT3 monoclonal antibody against CD3, named K32/CD86/4-1BBL/OKT3 cells. These artificial modified cells had the abilities of inducing CD8^＋ T cell activation, promoting CD8^＋ T cell proliferation, division, and long-term growth, inhibiting CD8^＋ T cell apoptosis, and enhancing CD8^＋ T cell secretion of IFN-T and perforin. Furthermore, antigen-specific cytotoxic T lymphocytes could be retained in the culture stimulated with K32/CD86/4-1BBL/OKT3 cells at least within 28 days. This approach was robust, simple, reproducible and economical for expansion and activation of CD8^＋ T cells and may have important therapeutic implications for adoptive immunotherapy. Cellular ＆ Molecular Immunology.
文摘Human immunodeficiency virus type-1 （HIV-1）-specific dendritic cell （DC） vaccines have been used in clinical trials. However, they have been found to only induce some degree of immune responses in these studies. We previously demonstrated that the HIV-1 Gag-specific Gag-Texo vaccine stimulated Gag-specific effector CD8＋ cytotoxic T lymphocyte （CTL） responses, leading to completely protective, but very limited, therapeutic immunity. In this study, we constructed a recombinant adenoviral vector, adenovirus （AdV）4-1BBL, which expressed mouse 4-1BB ligand （4-1BBL）, and generated transgenic 4-1BBL-engineered OVA-Texo/4.1BSL and Gag-Texo/4.1BSL vaccines by transfecting ovalbumin （OVA）-Texo and Gag-＇rexo cells with AdV4.1BBL, respectively. We demonstrate that the OVA-specific OVA-Texo/4.ZSSL vaccine stimulates more efficient OVA-specific CTL responses （3.26%） compared to OVA-Texo-activated responses （1.98%） in wild-type C57BIJ6 mice and the control OVA-TeXO/Nu, vaccine without transgenic 4-1BBL expression, leading to enhanced therapeutic immunity against 6-day established OVA-expressing B16 melanoma BL6-1OovA cells. OVA-Texo/4.1BBL-stimulated CTLs, which have a CD44＋CD62Lhigh IL-7R＋ phenotype, are likely memory CTL precursors, demonstrating prolonged survival and enhanced differentiation into memory CTLs with functional recall responses and long-term immunity against BL6-1OovA melanoma. In addition, we demonstrate that OVA-Texo/4_ZBBL-Stimulated CTLs up- and downregulate the expression of anti-apoptosis （Bcl2110, Naipl, No13, Pak7 and Tnfrsfllb） and pro-apoptosis （Casp12, Trp63 and Trp73） genes, respectively, by RT2 Profiler PCR array analysis. Importantly, the Gag-specific Gag-Texo/4.1BBL vaccine also stimulates more efficient Gag-specific therapeutic and long-term immunity against HLA-A2/Gag-expressing B 16 melanoma BL6-1OGag/A2 cells than the control Gag-TeXO/NuH vaccine in transgenic HLA-A2 mice. Taken together, our novel Gag-Texo/4-ZBBL vaccine, which is capable of st
文摘目的探讨共刺激分子4-1BB/4-1BBL在过敏性紫癜性肾炎(HSPN)患儿外周血单个核细胞(PBMC)中的表达及其临床意义。方法选取初发过敏性紫癜无肾炎(HSP组)、初发过敏性紫癜性肾炎(HSPN组)患儿各20例(其中15例进行了肾脏病理检查),20例正常儿童为对照组,分离培养PBMC。应用逆转录-聚合酶链式反应(RT-PCR)检测并比较三组PBMC中4-1BB m RNA和4-1BBL m RNA的变化,分析4-1BB/4-1BBL m RNA变化与肾脏病理的关系。结果HSPN、HSP患儿PBMC中4-1 BB m RNA、4-1 BBL m RNA的表达均高于对照组,差异有统计学意义(P均<0.01)。HSPN患儿的病理积分与4-1BB/4-1BBL m RNA表达呈正相关关系(r=0.570、0.515,P均<0.05)。PBMC中,加入植物血凝素后,HSPN组、HSP组和对照组4-1 BB/4-1 BBL m RNA的表达均高于空白对照组,差异有统计学意义(P均<0.01),其中HSP、HSPN组增高幅度较对照组明显,HSPN组增高幅度较HSP组更为显著,差异有统计学意义(P均<0.01);加入地塞米松后,HSPN组、HSP组4-1 BB/4-1 BBL m RNA的表达均较空白对照组减少,差异有统计学意义(P均<0.01)。结论 HSPN患儿PBMC中共刺激分子4-1BB/4-1BBL m RNA的表达显著增高,植物血凝素能诱导其高表达,而地塞米松能抑制其表达,提示4-1BB/4-1BBL可能参与HSPN的发病。
