Table of Contents Author Guidelines Submit a Manuscript
Clinical and Developmental Immunology
Volume 2011, Article ID 469135, 10 pages
http://dx.doi.org/10.1155/2011/469135
Clinical Study

Upregulated Expression of Indoleamine 2, 3-Dioxygenase in Primary Breast Cancer Correlates with Increase of Infiltrated Regulatory T Cells In Situ and Lymph Node Metastasis

1Department of Immunology, Key Laboratory of Cancer Prevention and Therapy, Tianjin Cancer Institute & Hospital, Tianjin Medical University, Tianjin 300060, China
2Department of Breast Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Cancer Institute & Hospital, Tianjin Medical University, Tianjin 300060, China
3Division of Tumor Cell Biology, Beckman Research Institute of City of Hope, Duarte, CA 91010, USA

Received 2 June 2011; Revised 25 July 2011; Accepted 25 July 2011

Academic Editor: W. Kast

Copyright © 2011 Jinpu Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

IDO has been reported to induce immunotolerance and promote metastasis in solid malignancy, but the mechanisms involved were not fully understood. In this study, the expression of IDO in primary breast cancer was examined and the correlation between the expression levels of IDO and the densities of Foxp3+ Tregs in situ was studied. The IDO stably-expressing CHO cells(IDO/CHO) were generated to evaluate the induction of Foxp3+ Tregs after coculturing with CD3+ T cells in vitro. The IDO expression in cancer was higher than that in benign diseases both at RNA and protein levels. The IDO expression was significantly upregulated in tumors of more advanced stages and with more extensive lymph node metastasis, and displayed positive linear correlation with the density of Foxp3+ Tregs. We further demonstrated that CD4+CD25+CD127 Tregs could be amplified by coculturing CD3+ T cells with IDO/CHO cells in vitro which displayed increasing Foxp3 expression both at mRNA and protein levels. Our results implied that up-regulation of IDO in primary breast cancer may inhibit local immune surveillance and promote metastasis by favoring development and infiltration of Foxp3+ Tregs in the tumor microenvironment.