Immunosurveillance against tetraploidization-induced colon tumorigenesis Academic Article uri icon

Overview

MeSH Major

  • Cell Transformation, Neoplastic
  • Colonic Neoplasms
  • Immunologic Surveillance
  • Tumor Suppressor Protein p53

abstract

  • Circumstantial evidence suggests that colon carcinogenesis can ensue the transient tetraploidization of (pre-)malignant cells. In line with this notion, the tumor suppressors APC and TP53, both of which are frequently inactivated in colon cancer, inhibit tetraploidization in vitro and in vivo. Here, we show that-contrarily to their wild-type counterparts- Tp53 (-/-) colonocytes are susceptible to drug-induced or spontaneous tetraploidization in vitro. Colon organoids generated from tetraploid Tp53 (-/-) cells exhibit a close-to-normal morphology as compared to their diploid Tp53 (-/-) counterparts, yet the colonocytes constituting these organoids are characterized by an increased cell size and an elevated expression of the immunostimulatory protein calreticulin on the cell surface. The subcutaneous injection of tetraploid Tp53 (-/-) colon organoids led to the generation of proliferating tumors in immunodeficient, but not immunocompetent, mice. Thus, tetraploid Tp53 (-/-) colonocytes fail to survive in immunocompetent mice and develop neoplastic lesions in immunocompromised settings only. These results suggest that tetraploidy is particularly oncogenic in the context of deficient immunosurveillance.

publication date

  • February 2013

Research

keywords

  • Academic Article

Identity

Language

  • eng

PubMed Central ID

  • PMC3587448

Digital Object Identifier (DOI)

  • 10.4161/cc.23369

PubMed ID

  • 23324343

Additional Document Info

start page

  • 473

end page

  • 9

volume

  • 12

number

  • 3