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Blood, 15 June 2006, Vol. 107, No. 12, pp. 4817-4824. Prepublished online as a Blood First Edition Paper on February 21, 2006; DOI 10.1182/blood-2006-01-0057. This Article Full Text Full Text (PDF) All Versions of this Article: 2006-01-0057v1 107/12/4817    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Chan, J. L. Articles by Rameshwar, P. Search for Related Content PubMed PubMed Citation Articles by Chan, J. L. Articles by Rameshwar, P. Related Collections Immunobiology Stem Cells in Hematology Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  IMMUNOBIOLOGY Antigen-presenting property of mesenchymal stem cells occurs during a narrow window at low levels of interferon- Jennifer L. Chan, Katherine C. Tang, Anoop P. Patel, Larissa M. Bonilla, Nicola Pierobon, Nicholas M. Ponzio, and Pranela Rameshwar From the Graduate School of Biomedical Sciences, the Department of Pharmacology and Physiology, the Department of Pathology and Laboratory Medicine, and the Department of Medicine-Hematology/Oncology, New Jersey Medical School (NJMS)–University of Medicine and Dentistry of New Jersey (UMDNJ), Newark, NJ. Mesenchymal stem cells (MSCs) are mostly found around the vasculature system of the adult bone marrow (BM). They function as immune suppressors, express MHC-II, are phagocytic, and support T-cell cytotoxicity. We hypothesize that these contradictory properties of MSCs are important for BM homeostasis and occur partly through antigen presentation (antigen-presenting cells [APCs]) within a narrow window. Indeed, we have verified APC functions of MSCs to recall antigens, Candida albicans and Tetanus toxoid. The target cells have been identified to be CD4+ T cells. APC assays with IFN-knockdown MSCs and with anti–IFN receptor confirmed that MHC-II expression requires autocrine stimulation by IFN. During APC functions, as IFN levels become elevated, there was a concomitant decrease in MHC-II on MSCs. This observation was correlated with flow cytometry studies showing a gradual decrease in MHC-II expression as IFN levels were increased. The reduced levels of MHC-II correlated with losses in their allogeneic potential, as indicated in mixed lymphocyte reaction. In summary, endogenous and low levels of IFN are required for MHC-II expression on MSCs, and for APC functions. APC functions occur during a narrow window before IFN levels are increased. The study has implications for BM protection against infection and exacerbated inflammatory responses. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: Q. Liu, Z. Chen, T. Terry, J. M. McNatt, J. T. Willerson, and P. Zoldhelyi Intra-Arterial Transplantation of Adult Bone Marrow Cells Restores Blood Flow and Regenerates Skeletal Muscle in Ischemic Limbs Vascular and Endovascular Surgery, October 1, 2009; 43(5): 433 - 443. [Abstract] [PDF] M. Francois, R. Romieu-Mourez, S. Stock-Martineau, M.-N. Boivin, J. L. Bramson, and J. Galipeau Mesenchymal stromal cells cross-present soluble exogenous antigens as part of their antigen-presenting cell properties Blood, September 24, 2009; 114(13): 2632 - 2638. [Abstract] [Full Text] [PDF] R. Romieu-Mourez, M. Francois, M.-N. Boivin, M. Bouchentouf, D. E. Spaner, and J. 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