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Oral immunization of BALB/c mice with recombinant Helicobacter pylori antigens and double mutant heat-labile toxin (dmLT) induces prophylactic protective immunity against H. pylori infection.
Microbial Pathogenesis ( IF 3.3 ) Pub Date : 2020-04-27 , DOI: 10.1016/j.micpath.2020.104229
Youxiu Zhong 1 , Jing Chen 1 , Yu Liu 1 , Yanbin Zhang 1 , Chongfa Tang 1 , Xuewei Wang 1 , Ping Wang 1 , Wangxue Chen 2 , Bo Wei 1 , Meiying Liu 1
Affiliation  

Helicobacter pylori infection and associated diseases remain a major public health problem worldwide. Much effort has been made over the last several decades in vaccine development, but there is no licensed vaccine on the market. We have previously reported that oral immunization with H. pylori lysates and double mutant heat-labile toxin (dmLT) affords prophylactic protection against H. pylori infection in mice. In the present study, we investigated the effects of oral immunization with recombinant H. pylori protein antigens (NAP/UreA/UreB) and dmLT on H. pylori challenge in BALB/c mice. We found that oral immunization with candidate antigens and dmLT significantly reduced the gastric colonization of H. pylori 6 weeks after challenge, as compared to unimmunized mice. Moreover, the subunit vaccine appeared to provide a better protection than the bacterial lysate vaccine. The immunized mice showed enhanced antigen-specific lymphocyte proliferation, and serum IgG and mucosal IgA responses. Furthermore, the immunization increased the proportion of CD4+ IL-17+ lymphocytes in spleen and mesenteric lymph nodes, and enhanced the production of IL-17, IL-16, IL-6 and TNF-α in lymphocyte culture supernatants. Taken together, our results suggest that oral vaccination with recombinant H. pylori antigens (NAP/UreA/UreB) and dmLT confers more effective prophylactic protection against H. pylori infection than whole bacterial lysates in BALB/c mice. The reduction of H. pylori colonization was associated with the induction of antigen-specific Th17 and local mucosal IgA immune responses.

中文翻译:

用重组幽门螺杆菌抗原和双重突变体热不稳定毒素(dmLT)口服免疫BALB / c小鼠可诱导针对幽门螺杆菌感染的预防性保护性免疫。

幽门螺杆菌感染和相关疾病仍然是世界范围内的主要公共卫生问题。在过去的几十年中,在疫苗开发方面已经做出了很多努力,但是市场上没有许可的疫苗。我们以前已经报道过,用幽门螺杆菌溶胞产物和双重突变体不耐热毒素(dmLT)进行口服免疫可预防小鼠中的幽门螺杆菌感染。在本研究中,我们调查了重组H.pylori蛋白抗原(NAP / UreA / UreB)和dmLT口服免疫对BALB / c小鼠中H. pylori攻击的影响。我们发现,与未免疫的小鼠相比,用候选抗原和dmLT进行的口服免疫显着降低了攻击后6周幽门螺杆菌的胃定植。此外,亚单位疫苗似乎比细菌裂解液疫苗提供更好的保护。免疫小鼠表现出增强的抗原特异性淋巴细胞增殖,血清IgG和粘膜IgA反应。此外,免疫增加了脾脏和肠系膜淋巴结中CD4 + IL-17 +淋巴细胞的比例,并增加了淋巴细胞培养上清液中IL-17,IL-16,IL-6和TNF-α的产生。两者合计,我们的结果表明,与BALB / c小鼠中的完整细菌裂解物相比,重组H.pylori抗原(NAP / UreA / UreB)和dmLT的口服疫苗可更有效地预防H. pylori感染。幽门螺杆菌定植的减少与抗原特异性Th17和局部粘膜IgA免疫反应的诱导有关。免疫小鼠表现出增强的抗原特异性淋巴细胞增殖,血清IgG和粘膜IgA反应。此外,免疫增加了脾脏和肠系膜淋巴结中CD4 + IL-17 +淋巴细胞的比例,并增加了淋巴细胞培养上清液中IL-17,IL-16,IL-6和TNF-α的产生。两者合计,我们的结果表明,与BALB / c小鼠中的完整细菌裂解物相比,重组H.pylori抗原(NAP / UreA / UreB)和dmLT的口服疫苗可更有效地预防H. pylori感染。幽门螺杆菌定植的减少与抗原特异性Th17和局部粘膜IgA免疫反应的诱导有关。免疫小鼠表现出增强的抗原特异性淋巴细胞增殖,血清IgG和粘膜IgA反应。此外,免疫增加了脾脏和肠系膜淋巴结中CD4 + IL-17 +淋巴细胞的比例,并增加了淋巴细胞培养上清液中IL-17,IL-16,IL-6和TNF-α的产生。综上所述,我们的研究结果表明,与BALB / c小鼠中的完整细菌裂解物相比,重组H.pylori抗原(NAP / UreA / UreB)和dmLT口服疫苗可更有效地预防H. pylori感染。幽门螺杆菌定植的减少与抗原特异性Th17和局部粘膜IgA免疫反应的诱导有关。免疫增加了脾和肠系膜淋巴结中CD4 + IL-17 +淋巴细胞的比例,并增加了淋巴细胞培养上清液中IL-17,IL-16,IL-6和TNF-α的产生。两者合计,我们的结果表明,与BALB / c小鼠中的完整细菌裂解物相比,重组H.pylori抗原(NAP / UreA / UreB)和dmLT的口服疫苗可更有效地预防H. pylori感染。幽门螺杆菌定植的减少与抗原特异性Th17和局部粘膜IgA免疫反应的诱导有关。免疫增加了脾和肠系膜淋巴结中CD4 + IL-17 +淋巴细胞的比例,并增加了淋巴细胞培养上清液中IL-17,IL-16,IL-6和TNF-α的产生。两者合计,我们的结果表明,与BALB / c小鼠中的完整细菌裂解物相比,重组H.pylori抗原(NAP / UreA / UreB)和dmLT的口服疫苗可更有效地预防H. pylori感染。幽门螺杆菌定植的减少与抗原特异性Th17和局部粘膜IgA免疫反应的诱导有关。幽门螺杆菌抗原(NAP / UreA / UreB)和dmLT可以比BALB / c小鼠中的完整细菌裂解物提供更有效的预防幽门螺杆菌感染的保护。幽门螺杆菌定植的减少与抗原特异性Th17的诱导和局部粘膜IgA免疫反应有关。幽门螺杆菌抗原(NAP / UreA / UreB)和dmLT可以比BALB / c小鼠中的完整细菌裂解物提供更有效的预防幽门螺杆菌感染的保护措施。幽门螺杆菌定植的减少与抗原特异性Th17和局部粘膜IgA免疫反应的诱导有关。
更新日期:2020-04-27
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