• Author: Jung, Ji-Won

    University of Queensland

  • Author: Veitch, Margaret

    University of Queensland

  • Author: Bridge, Jennifer A.

    University of Queensland

  • Author: Overgaard, Nana H.

    T-cells & Cancer, Division of Immunology & Vaccinology, National Veterinary Institute, Technical University of Denmark, Kemitorvet, 2800, Kgs. Lyngby, Denmark

  • Author: Cruz, Jazmina L. G.

    University of Queensland

  • Author: Linedale, Richard

    University of Queensland

  • Author: Franklin, Michael E.

    Princess Alexandra Hospital Brisbane

  • Author: Saunders, Nicholas A.

    University of Queensland

  • Author: Simpson, Fiona

    University of Queensland

  • Author: Frazer, Ian H.

    University of Queensland

  • Author: Steptoe, Raymond J.

    University of Queensland

  • Author: Wells, James W.

    University of Queensland

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Patients receiving immunosuppressive drugs to prevent organ transplant rejection exhibit a greatly increased risk of developing cutaneous squamous cell carcinoma (SCC). However, not all immunosuppressive drugs confer the same risk. Randomised, controlled trials demonstrate that switching renal transplant recipients receiving calcineurin inhibitor-based therapies to mammalian target of rapamycin (mTOR) inhibitors results in a reduced incidence of de novo SSC formation, and can even result in the regression of pre-existing premalignant lesions. However, the contribution played by residual immune function in this setting is unclear. We examined the hypotheses that mTOR inhibitors promote the enhanced differentiation and function of CD8+ memory T cells in the skin. Here, we demonstrate that the long-term oral administration of rapamycin to achieve clinically-relevant whole blood drug target thresholds, creates a “low rapamycin dose” environment in the skin. While both rapamycin and the calcineurin inhibitor tacrolimus elongated the survival of OVA-expressing skin grafts, and inhibited short-term antigen-specific CD8+ T cell responses, rapamycin but not tacrolimus permitted the statistically significant infiltration of CD8+ effector memory T cells into UV-induced SCC lesions. Furthermore, rapamycin uniquely enhanced the number and function of CD8+ effector and central memory T cells in a model of long-term contact hypersensitivity provided that rapamycin was present during the antigen sensitization phase. Thus, our findings suggest that patients switched to mTOR inhibitor regimens likely experience enhanced CD8+ memory T cell function to new antigen-challenges in their skin, which could contribute to their lower risk of de novo SSC formation and regression of pre-existing premalignant lesions.

Original languageEnglish
Article numbere1479627
JournalOncoImmunology
Volume7
Issue number9
Number of pages17
ISSN2162-4011
DOIs
StatePublished - 2 Sep 2018
CitationsWeb of Science® Times Cited: 0

    Research areas

  • Memory, Skin, T cells, Transplantation
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