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Identification of myeloid-derived suppressor cells and T regulatory cells in lung microenvironment after Urethane-induced lung tumor.

Abstract：

:Tumor growth occurs by the imbalance between cells with effector function and cells with suppressor/regulatory functions. To investigate this scenario we administered the chemical carcinogen Urethane in BALB/c mice and followed these animals during 120 days to observe lung tumor development. In another set of experiments the same protocol was performed with the harvest of spleen, lung and blood at 20 and 30 days after Urethane injection. The lung was used for histology, spleen cells were evaluated for IFN-γ production, and serum nitrite was measured as an indirect form of nitric oxide (NO) evaluation. The spleen and lung-infiltrating cells were evaluated by flow cytometry for CD11b+Gr-1+ myeloid suppressor cells and CD4+FoxP3+ T regulatory cells. Urethane led to lung nodules development after 120 days and the time point evaluation showed that splenocytes stimulated ex vivo expressed higher levels of IFN-γ 20 days after the chemical injection. Also, the level of nitric oxide in serum was higher after 20 days of Urethane injection. There was no statistical difference in spleen cells percentages for CD11b+Gr-1+ and CD4+Foxp3+ in all groups. However, lung-infiltrating cells presented early (20 days) a higher expression of CD11b+Gr-1+ suggesting suppression at this site. In conclusion, it was possible to observe two distinct events at the very early time point after Urethane injection. In periphery there was an increase at the effector immune response (as depicted by IFN-γ-producing cells) and in tumor development site there was an increase at the suppressor cell (CD11b+Gr-1+) phenotype. Suppressor/regulatory cells are targets for cancer therapy.

journal_name

Int Immunopharmacol

journal_title

International immunopharmacology

authors

Rosin FC,Pedregosa JF,de Almeida JS,Bueno V

doi

10.1016/j.intimp.2010.12.025

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

873-8

issue

7

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(11)00012-9

journal_volume

11

pub_type

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