Volume 125, Issue 4 p. 868-878
Tumor Immunology

CD4+ lymphocytes modulate prostate cancer progression in mice

Theofilos Poutahidis

Theofilos Poutahidis

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

Laboratory of Pathology, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece

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Varada P. Rao

Varada P. Rao

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

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Werner Olipitz

Werner Olipitz

Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA

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Christie L. Taylor

Christie L. Taylor

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

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Erin A. Jackson

Erin A. Jackson

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

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Tatiana Levkovich

Tatiana Levkovich

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

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Chung Wei Lee

Chung Wei Lee

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

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James G. Fox

James G. Fox

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

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Zhongming Ge

Zhongming Ge

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

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Susan E. Erdman

Corresponding Author

Susan E. Erdman

Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, MA

Fax: +617-258-5708.

Division of Comparative Medicine, Massachusetts Institute of Technology, 77 Massachusetts Ave., Bldg. 68-0032, Cambridge, MA 02139, USASearch for more papers by this author
First published: 11 June 2009
Citations: 26

Abstract

Chronic inflammation contributes to the development of prostate cancer in humans. Here, we show that male ApcMin/+ mice also develop prostate carcinoma with increasing age, mimicking that seen in humans in their 5th or 6th decade of life. Proinflammatory cytokines were significantly linked with cancer and increasing age in our mouse model; however, prostate and bowel tissues lacked evidence of inflammatory cell infiltrates other than mast cells. Lymphocytes protected against cancer, and protection from prostate cancer resided in antiinflammatory CD4+CD25+ regulatory (TREG) cells that downregulated inflammatory cytokines. Supplementation with syngeneic TREG cells collected from wild-type mice reduced the levels of interleukin (IL)-6 (p < 0.05) and IL-9 (p < 0.001) and lowered prostate cancer risk (p < 0.05). Depletion of CD25+ cells in 2-month-old animals increased the expression of IL-6 (p < 0.005) within prostate and increased the frequency of high-grade prostatic intraepithelial neoplasia (p < 0.05) and microinvasive prostatic carcinoma (p < 0.05) in dorsolateral prostate. Depletion of CD25+ cells in young animals also increased the frequency of intestinal cancer in Min mice. Taken together, chronically elevated proinflammatory cytokines promoted carcinoma in ApcMin/+ mice. TREG lymphocytes downregulated inflammation-associated carcinogenic processes and contributed to immune and epithelial homeostasis. © 2009 UICC

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