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GZMK high CD8 + T effector memory cells are associated with CD15 high neutrophil abundance in non-metastatic colorectal tumors and predict poor clinical outcome.

Silvia TibertiCarlotta CatozziOttavio CrociMattia BalleriniDanilo CagninaChiara SorianiCaterina ScirgoleaZheng GongJiatai HeAngeli D MacandogAmir NabinejadCarina B Nava LausonArianna Quinte'Giovanni BertalotWanda L PetzSimona P RavendaValerio LicursiPaola PaciMarco RasponiLuca RottaNicola FazioGuangwen RenUberto Fumagalli RomarioMartin H SchaeferStefano CampanerEnrico LugliLuigi NeziTeresa Manzo
Published in: Nature communications (2022)
CD8 + T cells are a major prognostic determinant in solid tumors, including colorectal cancer (CRC). However, understanding how the interplay between different immune cells impacts on clinical outcome is still in its infancy. Here, we describe that the interaction of tumor infiltrating neutrophils expressing high levels of CD15 with CD8 + T effector memory cells (T EM ) correlates with tumor progression. Mechanistically, stromal cell-derived factor-1 (CXCL12/SDF-1) promotes the retention of neutrophils within tumors, increasing the crosstalk with CD8 + T cells. As a consequence of the contact-mediated interaction with neutrophils, CD8 + T cells are skewed to produce high levels of GZMK, which in turn decreases E-cadherin on the intestinal epithelium and favors tumor progression. Overall, our results highlight the emergence of GZMK high CD8 + T EM in non-metastatic CRC tumors as a hallmark driven by the interaction with neutrophils, which could implement current patient stratification and be targeted by novel therapeutics.
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