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Micro RNA  (miR)‐451 is a cell metabolism‐related mi RNA  that can mediate cell energy‐consuming models by several targets. As miR‐451 can promote mechanistic target of rapamycin ( mTOR ) activity, and increased  mTOR  activity is related to increased differentiation of T‐helper 17 (Th17) cells, we sought to investigate whether miR‐451 can redistribute from cancer cells to infiltrated T cells and enhance the distribution of Th17 cells through  mTOR . Real‐time  PCR  was used for detecting expression of miR‐451 in gastric cancer, tumor infiltrated T cells and exosomes, and distribution of Th17 was evaluated by both flow cytometry and immunohistochemistry ( IHC ). Immunofluorescence staining was used in monitoring the exosome‐enveloped miR‐451 from cancer cells to T cells with different treatments, and signaling pathway change was analyzed by western blot. miR‐451 decreased significantly in gastric cancer ( GC ) tissues but increased in infiltrated T cells and exosomes; tumor miR‐451 was negatively related to infiltrated T cells and exosome miR‐451. Exosome miR‐451 can not only serve as an indicator for poor prognosis of post‐operation  GC  patients but is also related to increased Th17 distribution in gastric cancer. miR‐451 can redistribute from cancer cells to T cells with low glucose treatment. Decreased 5′  AMP ‐activated protein kinase ( AMPK ) and increased  mTOR  activity was investigated in miR‐451 redistributed T cells and the Th17 polarized differentiation of these T cells were also increased. Exosome miR‐451 derived from tumor tissues can serve as an indicator for poor prognosis and redistribution of miR‐451 from cancer cells to infiltrated T cells in low glucose treatment can enhance Th17 differentiation by enhancing  mTOR  activity.

Increased T‐helper 17 cell differentiation mediated by exosome‐mediated micro RNA ‐451 redistribution in gastric cancer infiltrated T cells