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Paving the way for intratumoral T cells

Tumors often express unusual antigens and are surrounded by immune cells. Unfortunately, this immune surveillance is imperfect and does not always prevent the tumors from growing. In addition, tumors are often hypoxic, because their rapid growth outstrips that of their blood and oxygen supply. Now, Hatfield et al. have linked these two phenomena by demonstrating that T cells avoid going into the hypoxic areas of tumors. The authors have also shown a way to overcome this problem in mice with lung tumors by having the animals breathe supplementary oxygen. Having a higher concentration of oxygen throughout the body improved the oxygenation inside the tumors, allowing immune cells to enter the tumors and attack them, extending the animals’ survival.

Abstract

Antitumor T cells either avoid or are inhibited in hypoxic and extracellular adenosine-rich tumor microenvironments (TMEs) by A2A adenosine receptors. This may limit further advances in cancer immunotherapy. There is a need for readily available and safe treatments that weaken the hypoxia–A2-adenosinergic immunosuppression in the TME. Recently, we reported that respiratory hyperoxia decreases intratumoral hypoxia and concentrations of extracellular adenosine. We show that it also reverses the hypoxia-adenosinergic immunosuppression in the TME. This, in turn, stimulates (i) enhanced intratumoral infiltration and reduced inhibition of endogenously developed or adoptively transfered tumor-reactive CD8 T cells, (ii) increased proinflammatory cytokines and decreased immunosuppressive molecules, such as transforming growth factor–β (TGF-β), (iii) weakened immunosuppression by regulatory T cells, and (iv) improved lung tumor regression and long-term survival in mice. Respiratory hyperoxia also promoted the regression of spontaneous metastasis from orthotopically grown breast tumors. These effects are entirely T cell– and natural killer cell–dependent, thereby justifying the testing of supplemental oxygen as an immunological coadjuvant to combine with existing immunotherapies for cancer.

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Supplementary Material

Summary

Materials and Methods
Fig. S1. The tumor-regressing effects of respiratory hyperoxia are lost in cγ/Rag-2−/− mice.
Fig. S2. ROS scavenger does not prevent the antitumor effects of respiratory hyperoxia.
Fig. S3. Respiratory hyperoxia reverses hypoxia-adenosinergic inhibition of NK cells.
Fig. S4. Respiratory hyperoxia does not further improve the activity of tumor-reactive A2AR−/− T cells.
Fig. S5. CD8 and CD4 T cells avoid hypoxic TME.
Fig. S6. Tregs with higher expression of CTLA-4 are more hypoxic.
Fig. S7. CD8 T cells from TDLN are enriched after culture activation for adoptive transfer.
Fig. S8. Breathing 60% oxygen increased IFN-γ production by CD8 T cells in the lung TME.
Table S1. Immunostimulating cytokines/chemokines increased by respiratory hyperoxia.
Table S2. Full list of primer sets in RT-PCR arrays.

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Published In

Science Translational Medicine
Volume 7 | Issue 277
March 2015

Submission history

Received: 23 October 2014
Accepted: 28 January 2015

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Acknowledgments

We thank J. Stagg at the University of Montreal for providing the 4T1 tumor cell line and sharing his expertise. We thank S. Ohman for assistance in all steps leading to the preparation of the manuscript. We also thank R. Marsh, professor of biology at Northeastern University, for assistance with monitoring and controlling gas levels in hyperoxic units. Funding: This work was supported by funding from Northeastern University and NIH grants to M.V.S. (R01 CA 112561, R01 CA 111985, R21 AT 002788, U19 AI 091693, Dana-Farber Cancer Institute, and Harvard Medical School–Northeastern University Joint Program in Cancer Drug Development) as well as by National Cancer Institute grant 5PO1CA109094-03 and National Institute of Allergy and Infectious Diseases 1P01 grant AI096396-01 3 to E.R.P.; HL109002, DK091190, DK068575, DK079307, and CA168628 to E.K. J.; and a Bankhead-Coley Postdoctoral Fellowship to T.H.S. Author contributions: S.M.H., J.K., A.O., and M.V.S. performed and/or analyzed cancer immunology assays. S.R. and J.L.K. performed, enumerated, and interpreted immunohistochemistry assays. J.K. established and supervised lung tumor models. E.R.P. and T.H.S. designed and performed assays with custom-made RNA arrays to scan lung TME. D.L., B.B., R.A., S.S., P.P., K.K., R.C., and M.T. performed or assisted in tumor immunology, immunohistochemistry, and flow cytometry assays. E.K.J. and B.K. analyzed and interpreted changes in the TME. M.V.S. designed the overall approach, directed all stages of research, and wrote the manuscript with S.M.H. Competing interests: U.S. government, NIH holds an issued patent “Methods for using extracellular adenosine inhibitors and adenosine receptor inhibitors to enhance immune response and inflammation,” US 8,716,301, which is related to the work described in this paper, with A.O. and M.V.S. named as inventors. M.V.S. is a founder of RedoxTherapies, a company that is charged with the translation of this approach into the clinic and has licensed this patent. E.R.P. has a provisional patent for “Anti-immune suppression tumor therapy” and is the scientific cofounder, paid consultant, and equity owner of Heat Biologics Inc., and T.H.S. is an employee at Heat Biologics Inc. J.L.K. is an employee and shareholder at Infinity Pharmaceuticals Inc. E.K.J. holds equity in Adenopaint, which is unrelated to the current study. Data and materials availability: Correspondence and requests for materials should be addressed to M.V.S. ([email protected]).

Authors

Affiliations

Stephen M. Hatfield
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Jorgen Kjaergaard
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Dmitriy Lukashev
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Taylor H. Schreiber*
Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
Bryan Belikoff
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Robert Abbott
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Shalini Sethumadhavan
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Phaethon Philbrook
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Kami Ko
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Ryan Cannici
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Molly Thayer
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Scott Rodig
Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, 20 Shattuck Street, Boston, MA 02115, USA.
Jeffrey L. Kutok
Department of Pathology, Brigham and Women’s Hospital, Harvard Medical School, 20 Shattuck Street, Boston, MA 02115, USA.
Edwin K. Jackson
Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA.
Barry Karger
Barnett Institute of Chemical and Biological Analysis, Northeastern University, Boston, MA 02115, USA.
Eckhard R. Podack
Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
Akio Ohta
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Michail V. Sitkovsky [email protected]
New England Inflammation and Tissue Protection Institute, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA.
Cancer Vaccine Center, Dana-Farber Cancer Institute, Harvard Institutes of Medicine, 44 Binney Street, Boston, MA 02115, USA.

Notes

*
Present address: Heat Biologics Inc., 801 Capitola Drive, Durham, NC 27713, USA.
Present address: Infinity Pharmaceuticals Inc., 780 Memorial Drive, Cambridge, MA 02139, USA.
Corresponding author. E-mail: [email protected]

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