将中文句子翻译为英文段落使更加学术化：本章旨在研究香菇多糖对于免疫抑制小鼠肠道菌群的影响。根据体内试验研究结果发现LNT能够显著提高肠道派氏淋巴结中的CD4+、CD8+T淋巴细胞的数量和比例考虑到肠道菌群与免疫之间具有密切关系因此本章内容从肠道菌群角度进一步分析LNT提高免疫水平的机理。

The aim of this chapter is to investigate the impact of polysaccharides from shiitake mushrooms on the gut microbiota of immunosuppressed mice. Based on the results of in vivo experiments, it was found that LNT significantly increased the number and proportion of CD4+ and CD8+ T lymphocytes in the Peyer's patches of the intestine. Given the close relationship between gut microbiota and immunity, this chapter further analyzes the mechanism by which LNT enhances immune function from the perspective of gut microbiota.