Lactobacillus rhamnosus GG Orchestrates an Antitumor Immune Response

免疫系统 免疫疗法 鼠李糖乳杆菌 CD8型 免疫学 T细胞 癌症 癌症免疫疗法 癌症研究 生物 细胞毒性T细胞 医学 乳酸菌 内科学 体外 细菌 生物化学 遗传学
作者
Joshua Owens,Bejan Saeedi,Crystal Naudin,Sarah Hunter-Chang,Maria E. Barbian,Richard U. Eboka,Lauren C. Askew,Trevor Darby,Brian Robinson,Rheinallt Jones
出处
期刊:Cellular and molecular gastroenterology and hepatology [Elsevier]
卷期号:12 (4): 1311-1327 被引量:45
标识
DOI:10.1016/j.jcmgh.2021.06.001
摘要

In colorectal cancer, approximately 95% of patients are refractory to immunotherapy because of low antitumor immune responses. Therefore, there is an exigent need to develop treatments that increase antitumor immune responses and decrease tumor burden to enhance immunotherapy.The gut microbiome has been described as a master modulator of immune responses. We administered the human commensal, Lactobacillus rhamnosus GG (LGG), to mice and characterized the changes in the gut immune landscape. Because the presence of lactobacilli in the gut microbiome has been linked with decreased tumor burden and antitumor immune responses, we also supplemented a genetic and a chemical model of murine intestinal cancer with LGG. For clinical relevance, we therapeutically administered LGG after tumors had formed. We also tested for the requirement of CD8 T cells in LGG-mediated modulation of gut tumor burden.We detected increased colonic CD8 T-cell responses specifically in LGG-supplemented mice. The CD8 T-cell induction was dependent on dendritic cell activation mediated via Toll-like receptor-2, thereby describing a novel mechanism in which a member of the human microbiome induces an intestinal CD8 T-cell response. We also show that LGG decreased tumor burden in the murine gut cancer models by a CD8 T-cell-dependent manner.These data support the potential use of LGG to augment antitumor immune responses in colorectal cancer patients and ultimately for increasing the breadth and efficacy of immunotherapy.
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