Cancer Immunology, Immunotherapy

, Volume 58, Issue 1, pp 135–144

MSI-H colorectal cancers preferentially retain and expand intraepithelial lymphocytes rather than peripherally derived CD8+ T cells

  • Kristi Baker
  • William D. Foulkes
  • Jeremy R. Jass
Original Article


The healthy colorectal mucosa contains many resident intraepithelial lymphocytes (IELs) consisting of partially activated yet hyporesponsive CD8+ T cells. A predominant feature of colorectal cancers (CRCs) characterized by high levels of microsatellite instability (MSI-H) is heavy infiltration by an intraepithelial population of tumor infiltrating lymphocytes (iTILs). While it has been assumed that these iTILs originate from tumor infiltration by peripheral CD8+ effector T cells, their origin remains unknown. In light of the phenotypic and functional differences exhibited by IELs and peripheral T cells, elucidation of the precursor population of iTILs in MSI-H CRCs could clarify the role played by these lymphocytes in tumor progression. The aim of the present study was to investigate whether MSI-H CRCs interact differently with IEL- versus peripherally-derived CD8+ T cells. Using a Transwell assay system to mimic basolateral infiltration of tumor cells by lymphocytes, T cell migration, retention, proliferation and phenotypic alterations were investigated. Results indicate that MSI-H CRCs preferentially retain and expand IEL-derived cells to a greater degree than their microsatellite stable (MSS) counterparts. While MSI-H CRCs also retained more peripherally derived T cells, this number was considerably less than that from the IEL population. While interaction of IELs with either CRC type led to baseline lymphocyte activation, MSS CRCs induced upregulation of additional activation markers on retained IELs compared to MSI-H CRCs. These results suggest that the abundant iTILs present in MSI-H CRCs result from expansion of the preexisting mucosal IEL population and imply a limited prognostic role for iTILs in MSI-H CRC.


Colorectal cancer Microsatellite instability Intraepithelial lymphocytes Tumor infiltrating lymphocytes 



Colorectal cancer


Intraepithelial lymphocytes


Intraepithelial tumor infiltrating lymphocytes


Magnetic activated cell sorting


Mismatch repair


Microsatellite instability high


Microsatellite stable


Transforming growth factor β


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Kristi Baker
    • 1
  • William D. Foulkes
    • 2
    • 3
  • Jeremy R. Jass
    • 1
    • 4
  1. 1.Department of PathologyMcGill UniversityMontréalCanada
  2. 2.Program in Cancer GeneticsMcGill UniversityMontréalCanada
  3. 3.Cancer Prevention CentreSegal Cancer Centre, Sir M.B. Davis-Jewish General HospitalMontréalCanada
  4. 4.Department of Cellular PathologySaint Mark’s HospitalMiddlesexUK

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