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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

HPV16-associated tumors control myeloid cell homeostasis in lymphoid organs, generating a suppressor environment for T cells

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Stone, Simone Cardozo [1] ; Marques Rossetti, Renata Ariza [1] ; Bolpetti, Aline [2] ; Boccardo, Enrique [3] ; de Araujo Souza, Patricia Savio [4, 5] ; Lepique, Ana Paula [1]
Total Authors: 6
[1] Univ Sao Paulo, Dept Immunol, Inst Biomed Sci, BR-05508 Sao Paulo - Brazil
[2] Sao Paulo State Univ, Dept Pathol, Sch Med, Sao Paulo - Brazil
[3] Univ Sao Paulo, Dept Microbiol, Inst Biomed Sci, BR-05508 Sao Paulo - Brazil
[4] Univ Fed Fluminense, Dept Immunobiol, Rio De Janeiro - Brazil
[5] Brazilian Natl Canc Inst, Program Cellular Biol, Rio De Janeiro - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Journal of Leukocyte Biology; v. 96, n. 4, p. 619-631, OCT 2014.
Web of Science Citations: 7

Tumors are complex structures containing different types of cells and molecules. The importance of the tumor microenvironment in tumor progression, growth, and maintenance is well-established. However, tumor effects are not restricted to the tumor microenvironment. Molecules secreted by, as well as cells that migrate from tumors, may circulate and reach other tissues. This may cause a series of systemic effects, including modulation of immune responses, and in some cases, leukocytosis and metastasis promotion. Leukocytosis has been described as a poor prognostic factor in patients with cervical cancer. The main etiological factor for cervical cancer development is persistent infection with high oncogenic risk HPV. Our laboratory has been exploring the effects of high oncogenic risk, HPV-associated tumors on lymphoid organs of the host. In the present study, we observed an increase in myeloid cell proliferation and alteration in cell signaling in APCs in the spleen of tumor-bearing mice. In parallel, we characterized the cytokines secreted in the inflammatory and tumor cell compartments in the tumor microenvironment and in the spleen of tumor-bearing mice. We show evidence of constitutive activation of the IL-6/STAT3 signaling pathway in the tumor, including TAMs, and in APCs in the spleen. We also observed that IL-10 is a central molecule in the tolerance toward tumor antigens through control of NF-B activation, costimulatory molecule expression, and T cell proliferation. These systemic effects over myeloid cells are robust and likely an important problem to be addressed when considering strategies to improve anti-tumor T cell responses. (AU)

FAPESP's process: 08/03232-1 - HPV and tumor microenvironment
Grantee:Luisa Lina Villa
Support type: Research Projects - Thematic Grants
FAPESP's process: 10/20010-2 - Immune response modulation by tumor cells
Grantee:Ana Paula Lepique
Support type: Regular Research Grants