RNF43 p.G659fs 通过 PI3K/AKT/mTOR 信号通路和 HLA-E 上调导致 MSI-high 结直肠癌中 NK 细胞功能障碍
RNF43 p.G659fs leads to natural killer cell dysfunction in MSI-high colorectal cancer through PI3K/AKT/mTOR signaling and HLA-E up-regulation.
CELL INTELLIGENCE · 肿瘤细胞治疗研究
肿瘤细胞治疗研究
英文原题:MUC2 expression modulates immune infiltration in colorectal cancer.
MUC2 expression modulates immune infiltration in colorectal cancer.
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我们的研究首次证明 MUC2 在体外作为结直肠癌(CRC)中免疫浸润的物理屏障发挥作用。在 HT-29 细胞中,MUC2 敲除增加了免疫浸润,而在 LS-174T 细胞中,其他黏蛋白(MUC6、MUC5B)的代偿性表达维持了屏障。这些发现揭示了 CRC 中黏蛋白生物学的复杂性,并提示靶向黏蛋白通路可能是一种新的治疗策略。
结直肠癌(CRC)是一种全球范围内发病率和死亡率都很高的常见恶性肿瘤。深入理解癌细胞与肿瘤微环境中其他细胞的相互作用,对于制定有效的治疗策略至关重要。MUC2是胃肠道保护性黏液层的主要成分,已被认为与CRC进展和免疫反应调节有关。
本研究旨在利用两种成熟细胞系HT-29和LS-174T的体外模型,阐明MUC2表达与CRC内免疫浸润之间的关系。通过CRISPR介导的MUC2敲除,我们探讨了MUC2对肿瘤免疫浸润的影响及其在3D球体培养中与富集T细胞和NK细胞的外周血单个核细胞(PBMCs)的相互作用。
虽然与HT-29相比,MUC2在LS-174T细胞系中更为丰富,但其敲除仅在HT-29细胞系中导致免疫浸润增加,而在LS-174T细胞系中则未出现此现象。我们发现,在LS-174T中,MUC2蛋白的去除被胃肠道上皮中常见表达的其他凝胶形成黏蛋白(MUC6、MUC5B)的表达所补偿,而在HT-29细胞系中则未观察到这一现象。
While MUC2 was more abundant in LS-174T cell line compared to HT-29, its knockout resulted in increased immune infiltration solely in the HT-29 cell line, but not in the LS-174T cell line. We revealed that the removal of MUC2 protein was compensated in LS-174T by the expression of other gel-forming mucin proteins (MUC6, MUC5B) commonly expressed in the gastrointestinal epithelium, while this was not observed in HT-29 cell line.
Our study is the first to demonstrate that MUC2 functions as a physical barrier to immune infiltration in colorectal cancer (CRC) in vitro . In HT-29 cells, MUC2 knockout increased immune infiltration, while in LS-174T cells, compensatory expression of other mucins (MUC6, MUC5B) maintained the barrier. These findings reveal the complexity of mucin biology in CRC and suggest that targeting mucin pathways could be a novel therapeutic approach.
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