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Stem Cells International
Volume 2016 (2016), Article ID 1628352, 11 pages
http://dx.doi.org/10.1155/2016/1628352
Research Article

Delta-Like-1 Changes the Immunomodulatory Property of OP9 Cells

1Laboratory of Animal Genetic Breeding and Reproduction, Yanbian University, Yanji, Jilin 133002, China
2Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences, 27 Taiping Road, Haidian District, Beijing 100850, China
3Department of Biology and Chemical Engineering, Tongren University, Tongren, Guizhou 554300, China
4Beijing Aiyuhua Hospital for Children and Women, 2 South Street, Beijing Economic and Technological Development Zone, Beijing 100176, China
5307-Ivy Translational Medicine Center, Laboratory of Oncology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing 100071, China

Received 29 January 2015; Revised 10 April 2015; Accepted 20 April 2015

Academic Editor: Vladislav Volarevic

Copyright © 2016 Lei Zhang 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

As stromal cells and recently confirmed mesenchymal stem cells, OP9 cells support hematopoiesis stem cell (HSC) differentiation into the B lymphocyte lineage, yet Delta-like-1 (DL1) overexpressing OP9 (OP9DL1) cells promote the development of early T lymphocytes from HSC. However, the immunomodulatory capacity of OP9 or OP9DL1 on mature B and T cell proliferation has not been elucidated. Here, we show that OP9 and OP9DL1 have similar proliferation capacities and immunophenotypes except DL1 expression. Compared with OP9, OP9DL1 displayed more osteogenesis and less adipogenesis when cultured in the respective induction media. Both OP9 and OP9DL1 inhibited mature B and T cell proliferation. Furthermore, OP9 showed stronger inhibition on B cell proliferation and OP9DL1 exhibited stronger inhibition on T cell proliferation. With stimulation, both OP9 and OP9DL1 showed increased nitrate oxide (NO) production. The NO levels of OP9 were higher than that of OP9DL1 when stimulated with TNFα/IFNγ or LPS/IL4. Taken together, our study reveals a previously unrecognized role of OP9 and OP9DL1 in mature B and T cell proliferation. DL1 overexpression alone changed the properties of OP9 cells in addition to their role in early B cell development.