Chemotherapy-induced ileal crypt apoptosis and the ileal microbiome shape immunosurveillance and prognosis of proximal colon cancer

Nat Med. 2020 Jun;26(6):919-931. doi: 10.1038/s41591-020-0882-8. Epub 2020 May 25.

Abstract

The prognosis of colon cancer (CC) is dictated by tumor-infiltrating lymphocytes, including follicular helper T (TFH) cells and the efficacy of chemotherapy-induced immune responses. It remains unclear whether gut microbes contribute to the elicitation of TFH cell-driven responses. Here, we show that the ileal microbiota dictates tolerogenic versus immunogenic cell death of ileal intestinal epithelial cells (IECs) and the accumulation of TFH cells in patients with CC and mice. Suppression of IEC apoptosis led to compromised chemotherapy-induced immunosurveillance against CC in mice. Protective immune responses against CC were associated with residence of Bacteroides fragilis and Erysipelotrichaceae in the ileum. In the presence of these commensals, apoptotic ileal IECs elicited PD-1+ TFH cells in an interleukin-1R1- and interleukin-12-dependent manner. The ileal microbiome governed the efficacy of chemotherapy and PD-1 blockade in CC independently of microsatellite instability. These findings demonstrate that immunogenic ileal apoptosis contributes to the prognosis of chemotherapy-treated CC.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenocarcinoma / drug therapy*
  • Adenocarcinoma / immunology
  • Adenocarcinoma / microbiology
  • Adenocarcinoma / pathology
  • Adult
  • Aged
  • Aged, 80 and over
  • Animals
  • Antineoplastic Agents / pharmacology*
  • Antineoplastic Agents / therapeutic use
  • Apoptosis / drug effects*
  • Apoptosis / immunology
  • Bacteroides fragilis
  • Cell Line, Tumor
  • Colonic Neoplasms / drug therapy*
  • Colonic Neoplasms / immunology
  • Colonic Neoplasms / microbiology
  • Colonic Neoplasms / pathology
  • Epithelial Cells / drug effects
  • Epithelial Cells / immunology
  • Epithelial Cells / pathology
  • Female
  • Firmicutes
  • Gastrointestinal Microbiome / immunology*
  • Gastrointestinal Microbiome / physiology
  • Humans
  • Ileum / drug effects*
  • Ileum / immunology
  • Ileum / microbiology
  • Ileum / pathology
  • Immunogenic Cell Death / drug effects
  • Immunogenic Cell Death / immunology
  • Immunologic Surveillance / drug effects
  • Immunologic Surveillance / immunology
  • Interleukin-12 / immunology
  • Intestinal Mucosa
  • Lymphocytes, Tumor-Infiltrating / drug effects*
  • Lymphocytes, Tumor-Infiltrating / immunology
  • Male
  • Mice
  • Middle Aged
  • Oxaliplatin / pharmacology*
  • Oxaliplatin / therapeutic use
  • Prognosis
  • Programmed Cell Death 1 Receptor / antagonists & inhibitors
  • Receptors, Interleukin-1 Type I / immunology
  • T-Lymphocytes, Helper-Inducer / drug effects
  • T-Lymphocytes, Helper-Inducer / immunology

Substances

  • Antineoplastic Agents
  • Programmed Cell Death 1 Receptor
  • Receptors, Interleukin-1 Type I
  • Oxaliplatin
  • Interleukin-12