自然杀伤T细胞(natural killer T cells,NKT细胞)属于T淋巴细胞,能特异性识别抗原递呈细胞表面主要组织相容性复合体I类样分子CD1d递呈的糖脂类抗原。活化的NKT细胞能发挥抗病毒感染和抗肿瘤等作用,参与机体重要的免疫反应。本文对NKT...自然杀伤T细胞(natural killer T cells,NKT细胞)属于T淋巴细胞,能特异性识别抗原递呈细胞表面主要组织相容性复合体I类样分子CD1d递呈的糖脂类抗原。活化的NKT细胞能发挥抗病毒感染和抗肿瘤等作用,参与机体重要的免疫反应。本文对NKT细胞抗病毒作用的相关进展进行综述,同时分析NKT细胞参与肝损伤等慢性病毒感染的发病进程。展开更多
Background Many types of human tumors can suppress the immune system to enhance their survival. Loss or down-regulation of human leukocyte antigens （HLA） class I on tumors is considered to be a major mechanism of tu...Background Many types of human tumors can suppress the immune system to enhance their survival. Loss or down-regulation of human leukocyte antigens （HLA） class I on tumors is considered to be a major mechanism of tumor immune escape. Our previous studies found that HLA class I on peripheral-blood mononuclear cells was significantly lower in gastric cancer patients. The present study made an analysis of HLA class I expression on peripheral-blood T lymphocytes and NK cells from subjects of Lijiadian village, a village with high-incidence gastrointestinal tumor. Methods A total of 181 villagers from Lijiadian village and 153 normal controls from the Department of Health Examination Center were enrolled in this study. Using a multi-tumor markers detection system, these villagers were divided into two groups： high-risk group （tumor markers positive group） and low-risk group （tumor markers negative group）. The percentage of T lymphocytes and NK cells and levels of HLA class I on their surface were determined in these subjects by flow cytometry. Results Percentages of T lymphocytes and NK cells in peripheral-blood mononuclear cells did not vary with age. The expression level of HLA class I on peripheral T lymphocytes and NK cells was not affected by age or gender, but was significantly down-regulated in Lijiadian villagers （P 〈0.05）, with the low-risk group, there was a significant reduction of cells （P 〈0.05） in the high-risk group. especially on the surface of NK cells （P 〈0.01）. Compared HLA class I on peripheral T lymphocytes （P 〈0.05） and NK Conclusions HLA class I on peripheral T lymphocytes and NK cells may be involved in tumorigenesis and development of gastrointestinal tumor, and understanding their changes in expression may provide new insights into the mechanism of tumor immunity.展开更多
Background Humoral immunity is an important factor for long-term survival of renal allograft. Here we performed a four-year follow-up to explore the clinical significance of monitoring anti-human leukocyte antigens （...Background Humoral immunity is an important factor for long-term survival of renal allograft. Here we performed a four-year follow-up to explore the clinical significance of monitoring anti-human leukocyte antigens （HLA） and anti-major histocompatibility complex class I-related chain A （MICA） antibody expression after kidney transplantation. Methods We obtained serial serum samples from 84 kidney transplant patients over a four-year period. All patients were followed up at least 6 months after transplantation and had at least two follow-up points. Anti-HLA and anti-MICA antibody titres and serum creatinine （SCr） levels were evaluated at each follow-up. Patients were divided into 4 groups： HLA（＋） MICA（-）, HLA（-）MICA（＋）, HLA（＋）MICA（＋） and HLA（-）MICA（-）. The impact of post-transplant antibody level on kidney allograft function was evaluated. Results Antibodies were detected in 38.1% （32/84） of the renal allograft recipients. HLA, MICA and HLA＋MICA expression was observed in 18.89%, 14.44% and 5.93% of the recipients respectively. The most frequent anti-HLA and anti-MICA specific antibodies identified were All, A24, A29, A32, A33, A80; B7, B13, B37; DR17, DR12, DR18, DR52, DR53, DR1, DR4, DR9, DR51; DQ7, DQ4, DQ8, DQ2, DQ9, DQ5, DQ6 and MICA02, MICA18, MICA19, MICA07, MICA27. As the time after transplantation elapsed, more recipients developed de novo antibody expression. Total 11.91% （10/84） of the recipients had de novo antibody expression during the follow up. The average level of SCr and the percentage of recipients with abnormal allograft function were significantly higher in recipients with anti-HLA and/or anti- MICA antibody expression than those without. The appearance of anti-HLA and anti-MICA antibody expression always preceded the increase in SCr value. Conclusions Anti-HLA and anti-MICA antibody expression has predictive value for early and late allograft dysfunction. The presence of donor specific antibody is detrimental to graft function an展开更多
目的探讨膀胱尿路上皮癌中MHCI类链相关蛋白A（MHC class I chain．relatedA，MICA）的表达，以及与核因子-KB（ntlclear factor-κB，NF—κB）和p53的相互关系，为研究膀胱癌组织中MICA蛋白的表达机制提供组织学依据。方法用免疫组化...目的探讨膀胱尿路上皮癌中MHCI类链相关蛋白A（MHC class I chain．relatedA，MICA）的表达，以及与核因子-KB（ntlclear factor-κB，NF—κB）和p53的相互关系，为研究膀胱癌组织中MICA蛋白的表达机制提供组织学依据。方法用免疫组化方法检测75例膀胱尿路上皮癌及15例正常膀胱黏膜中MICA、NF-κB和p53蛋白表达，对MICA、NF-κB和p53在正常膀胱黏膜、浸润和非浸润膀胱癌中的表达进行统计学分析。结果（1）MICA、NF—κB和p53蛋白在膀胱癌的表达率分别为48．0％、85．3％和49．3％，均显著高于正常膀胱黏膜（P〈0．05）。MICA蛋白在浸润性膀胱癌的表达低于非浸润性膀胱癌（P〈0．05）。（2）膀胱癌组织中MICA与NF-κB蛋白表达呈正相关（r=0．256，P=0．027），而MICA和p53蛋白的表达呈负相关（r=-0．23，P=0．047）。结论膀胱癌中MICA蛋白常表达上调，可作为膀胱癌的肿瘤相关抗原；NF-κB通路可能参与MICA的表达调控；p53通路可能不参与膀胱尿路上皮恶性转化过程中MICA蛋白的表达。展开更多
文摘自然杀伤T细胞(natural killer T cells,NKT细胞)属于T淋巴细胞,能特异性识别抗原递呈细胞表面主要组织相容性复合体I类样分子CD1d递呈的糖脂类抗原。活化的NKT细胞能发挥抗病毒感染和抗肿瘤等作用,参与机体重要的免疫反应。本文对NKT细胞抗病毒作用的相关进展进行综述,同时分析NKT细胞参与肝损伤等慢性病毒感染的发病进程。
基金This study was supported by grants from Shandong Province Science Foundation for Key Programs （No. 2007GG20002027, 2008GG2NS0216 and 2009GG10002043） and Shandong Province Natural Science Foundation （No. Y2008C104）.
文摘Background Many types of human tumors can suppress the immune system to enhance their survival. Loss or down-regulation of human leukocyte antigens （HLA） class I on tumors is considered to be a major mechanism of tumor immune escape. Our previous studies found that HLA class I on peripheral-blood mononuclear cells was significantly lower in gastric cancer patients. The present study made an analysis of HLA class I expression on peripheral-blood T lymphocytes and NK cells from subjects of Lijiadian village, a village with high-incidence gastrointestinal tumor. Methods A total of 181 villagers from Lijiadian village and 153 normal controls from the Department of Health Examination Center were enrolled in this study. Using a multi-tumor markers detection system, these villagers were divided into two groups： high-risk group （tumor markers positive group） and low-risk group （tumor markers negative group）. The percentage of T lymphocytes and NK cells and levels of HLA class I on their surface were determined in these subjects by flow cytometry. Results Percentages of T lymphocytes and NK cells in peripheral-blood mononuclear cells did not vary with age. The expression level of HLA class I on peripheral T lymphocytes and NK cells was not affected by age or gender, but was significantly down-regulated in Lijiadian villagers （P 〈0.05）, with the low-risk group, there was a significant reduction of cells （P 〈0.05） in the high-risk group. especially on the surface of NK cells （P 〈0.01）. Compared HLA class I on peripheral T lymphocytes （P 〈0.05） and NK Conclusions HLA class I on peripheral T lymphocytes and NK cells may be involved in tumorigenesis and development of gastrointestinal tumor, and understanding their changes in expression may provide new insights into the mechanism of tumor immunity.
基金the grants from the the National Science Foundation of China，the Key Discipline of Medicine of Jiangsu Province，the Outstanding Medical Academic Leader Program of Jiangsu Province，the Science Foundation of Jiangsu Province，the Key Laboratory Foundation of Suzhou
文摘Background Humoral immunity is an important factor for long-term survival of renal allograft. Here we performed a four-year follow-up to explore the clinical significance of monitoring anti-human leukocyte antigens （HLA） and anti-major histocompatibility complex class I-related chain A （MICA） antibody expression after kidney transplantation. Methods We obtained serial serum samples from 84 kidney transplant patients over a four-year period. All patients were followed up at least 6 months after transplantation and had at least two follow-up points. Anti-HLA and anti-MICA antibody titres and serum creatinine （SCr） levels were evaluated at each follow-up. Patients were divided into 4 groups： HLA（＋） MICA（-）, HLA（-）MICA（＋）, HLA（＋）MICA（＋） and HLA（-）MICA（-）. The impact of post-transplant antibody level on kidney allograft function was evaluated. Results Antibodies were detected in 38.1% （32/84） of the renal allograft recipients. HLA, MICA and HLA＋MICA expression was observed in 18.89%, 14.44% and 5.93% of the recipients respectively. The most frequent anti-HLA and anti-MICA specific antibodies identified were All, A24, A29, A32, A33, A80; B7, B13, B37; DR17, DR12, DR18, DR52, DR53, DR1, DR4, DR9, DR51; DQ7, DQ4, DQ8, DQ2, DQ9, DQ5, DQ6 and MICA02, MICA18, MICA19, MICA07, MICA27. As the time after transplantation elapsed, more recipients developed de novo antibody expression. Total 11.91% （10/84） of the recipients had de novo antibody expression during the follow up. The average level of SCr and the percentage of recipients with abnormal allograft function were significantly higher in recipients with anti-HLA and/or anti- MICA antibody expression than those without. The appearance of anti-HLA and anti-MICA antibody expression always preceded the increase in SCr value. Conclusions Anti-HLA and anti-MICA antibody expression has predictive value for early and late allograft dysfunction. The presence of donor specific antibody is detrimental to graft function an
文摘目的探讨膀胱尿路上皮癌中MHCI类链相关蛋白A（MHC class I chain．relatedA，MICA）的表达，以及与核因子-KB（ntlclear factor-κB，NF—κB）和p53的相互关系，为研究膀胱癌组织中MICA蛋白的表达机制提供组织学依据。方法用免疫组化方法检测75例膀胱尿路上皮癌及15例正常膀胱黏膜中MICA、NF-κB和p53蛋白表达，对MICA、NF-κB和p53在正常膀胱黏膜、浸润和非浸润膀胱癌中的表达进行统计学分析。结果（1）MICA、NF—κB和p53蛋白在膀胱癌的表达率分别为48．0％、85．3％和49．3％，均显著高于正常膀胱黏膜（P〈0．05）。MICA蛋白在浸润性膀胱癌的表达低于非浸润性膀胱癌（P〈0．05）。（2）膀胱癌组织中MICA与NF-κB蛋白表达呈正相关（r=0．256，P=0．027），而MICA和p53蛋白的表达呈负相关（r=-0．23，P=0．047）。结论膀胱癌中MICA蛋白常表达上调，可作为膀胱癌的肿瘤相关抗原；NF-κB通路可能参与MICA的表达调控；p53通路可能不参与膀胱尿路上皮恶性转化过程中MICA蛋白的表达。
