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TISSUE-SPECIFIC STEM CELLS

A Novel Function of Interleukin-10 Promoting Self-Renewal of Hematopoietic Stem Cells

^aCatholic High-Performance Cell Therapy Center and Department of Cellular Medicine;
^bDepartment of Pediatrics;
^cDepartment of Dermatology, The Catholic University of Korea, Seoul, Republic of Korea

Key Words. Stem cells • Hematopoiesis • Transplantation • Self-renewal

Correspondence: Il-Hoan Oh, M.D., Ph.D., Catholic High-Performance Cell Therapy Center, The Catholic University of Korea, 505, Banpo-Dong, Seocho-Ku, Seoul, Korea 137-701. Telephone: 82-2-590-2515; Fax: 82-2-591-3994; e-mail: iho{at}catholic.ac.kr

Received on January 2, 2007; accepted for publication on April 5, 2007.

First published online in STEM CELLS EXPRESS  April 26, 2007.


Self-renewal of hematopoietic stem cells (HSCs) is key to their reconstituting ability, but the factors regulating the process remain poorly understood. Here, we show that Interleukin-10 (IL-10), a pleiotropic immune modulating cytokine, can also play a role in regulating HSC self-renewal. First, a quantitative decrease of primitive hematopoietic cell populations, but not more matured cells, was observed in the bone marrows of IL-10 disrupted mice as determined by long-term in vitro cultures or in vivo competitive repopulation assays. In contrast, normal HSCs from 5-fluorouracil treated marrows cultured on the IL-10 secreting stroma displayed an enhanced repopulating activity compared with cells grown on control stroma, with ninefold higher numbers of donor-derived HSCs in the reconstituted recipient marrows. Moreover, limiting dilution transplantation assay demonstrated that exogenous addition of IL-10 in the stroma-free cultures of purified Lin^–Sca-1⁺c-kit⁺ cells caused three- to fourfold higher frequencies of HSCs in the 5-day short-term culture without indirect inhibitory effect of IL-10 on tumor necrosis factor- or interferon- secretion. Interestingly, primitive hematopoietic cells, including Lin^–Sca-1⁺c-kit⁺ or side population cells, expressed the surface receptor for IL-10, and microenvironmental production of IL-10 was sharply increased in the osteoblasts lining the trabecular regions of the radiation-stressed marrow but not in the steady-state marrows. These results show that IL-10 may be a ligand that can stimulate self-renewal of HSCs to promote their regeneration in addition to being a ligand for immune regulation.

Disclosure of potential conflicts of interest is found at the end of this article.

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