Volume 91, Issue 9 pp. 556-567
Original Article

Modulation of antitumour immune responses by intratumoural Stat1 expression

Nicole L Messina

Nicole L Messina

Cancer Therapeutics Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia

Deptartment of Pathology, University of Melbourne, Parkville, Victoria, Australia

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Kellie M Banks

Kellie M Banks

Cancer Therapeutics Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia

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Eva Vidacs

Eva Vidacs

Cancer Therapeutics Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia

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Ben P Martin

Ben P Martin

Cancer Therapeutics Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia

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Fennella Long

Fennella Long

Cancer Therapeutics Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia

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Ailsa J Christiansen

Ailsa J Christiansen

Institute of Pharmaceutical Science, Swiss Federal Institute of Technology (ETHZ), Zurich, Switzerland

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Mark J Smyth

Mark J Smyth

Immunology in Cancer and Infection Laboratory, Queensland Institute of Medical Research, Herston, Queensland, Australia

School of Medicine, University of Queensland, Herston, Queensland, Australia

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Christopher J P Clarke

Christopher J P Clarke

Cancer Therapeutics Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia

Deptartment of Pathology, University of Melbourne, Parkville, Victoria, Australia

Equal senior authors.

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Ricky W Johnstone

Ricky W Johnstone

Cancer Therapeutics Program, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia

Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Victoria, Australia

Equal senior authors.

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First published: 20 August 2013
Citations: 11
Professor RW Johnstone, Cancer Therapeutics Program, Peter MacCallum Cancer Centre, St Andrews Place, University of Melbourne, East Melbourne, Victoria 3010, Australia. E-mail: [email protected]

Abstract

Signal transducer and activator of transcription 1 (Stat1) mediates anti-viral responses and cytokine-driven anti-proliferative, apoptotic and immunomodulatory activities. As de-regulated Stat1 function can affect tumour progression we sought to elucidate the effects of tumour cell-intrinsic Stat1 expression on immunosurveillance. Knockout of Stat1 enhanced the development of sarcomas induced by the chemical carcinogen 3-methylcholanthrene (MCA). Growth of transplanted MCA-induced Stat1−/− sarcomas was suppressed in wild-type mice compared to growth in Stat1−/− and immunocompromised recipients. Co-depletion of NK and CD8+ T cells from wild-type mice facilitated Stat1-deficient tumour growth whereas depletion of CD4+ T cells and CD8+ T cells did not. In vitro and in vivo analysis of the tumours implicated a role for NK cell-mediated, perforin-dependent killing of Stat1-deficient tumours. Interestingly, restoration of Stat1 expression in Stat1−/− tumours resulted in diminished involvement of NK cells and increased contribution of CD8+ T cells in anti-tumour responses. Therefore, Stat1 expression within tumour cells modulated anti-tumour immune responses by altering the dominant immune effector cell involvement from NK cells to CD8+ T cells in the absence or presence of Stat1 respectively.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

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