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Regulatory T Cells from Colon Cancer Patients Inhibit Effector T-cell Migration through an Adenosine-Dependent Mechanism.

Artikel i vetenskaplig tidskrift
Författare Patrik Sundström
Hanna Stenstad
Veronica Langenes
Filip Ahlmanner
Lisa Theander
Tapuka Gordon Ndah
Kamilla Fredin
Lars Börjesson
Bengt Gustavsson
Jérémy Bastid
Marianne Quiding-Järbrink
Publicerad i Cancer immunology research
Volym 4
Nummer/häfte 3
Sidor 183-93
ISSN 2326-6074
Publiceringsår 2016
Publicerad vid Institutionen för biomedicin, avdelningen för mikrobiologi och immunologi
Sidor 183-93
Språk en
Länkar dx.doi.org/10.1158/2326-6066.CIR-15...
Ämneskategorier Cancer och onkologi, Kirurgi

Sammanfattning

T cell-mediated immunity is a major component of antitumor immunity. In order to be efficient, effector T cells must leave the circulation and enter into the tumor tissue. Regulatory T cells (Treg) from gastric cancer patients, but not from healthy volunteers, potently inhibit migration of conventional T cells through activated endothelium. In this study, we compared T cells from colon cancer patients and healthy donors to determine the mechanisms used by Tregs from cancer patients to inhibit conventional T-cell migration. Our results showed that circulating Tregs from cancer patients expressed high levels of CD39, an ectoenzyme mediating hydrolysis of ATP to AMP, as a rate-determining first step in the generation of immunosuppressive adenosine. Tumor-associated Tregs expressed even more CD39, and we therefore examined the importance of adenosine in Treg-mediated inhibition of T-cell transendothelial migration in vitro. Exogenous adenosine significantly reduced migration of conventional T cells from healthy volunteers, and blocking either adenosine receptors or CD39 enzymatic activity during transmigration restored the ability of conventional T cells from cancer patients to migrate. Adenosine did not directly affect T cells or endothelial cells, but reduced the ability of monocytes to activate the endothelium. Taken together, our results indicate that Treg-derived adenosine acts on monocytes and contributes to reduced transendothelial migration of effector T cells into tumors. This effect of Tregs is specific for cancer patients, and our results indicate that Tregs may affect not only T-cell effector functions but also their migration into tumors. Cancer Immunol Res; 4(3); 183-93. ©2016 AACR.

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