Patrick Hwu

Melanoma Medical Oncology, Cancer Medicine

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Overexpression of interleukin 21 induces expansion of hematopoietic progenitor cells

Katsutoshi Ozaki; Ai Hishiya; Keiko Hatanaka; Hideaki Nakajima; Gang Wang; Patrick Hwu; Toshio Kitamura; Keiya Ozawa; Warren J. Leonard; Tetsuya Nosaka (Profiled Author: Patrick Hwu)

International Journal of Hematology. 2006;84(3):224-230.

The interleukin 21 (IL-21) receptor is expressed on T-cells, B-cells, and natural killer cells, and IL-21 is critical for regulating immunoglobulin production in vivo in cooperation with IL-4. So far, however, little is known about a role for IL-21 outside the immune system. We investigated the effect of IL-21 on hematopoiesis in vivo by using the hydrodynamics gene-delivery method. Overexpression of IL-21 increases Sca-1⁺ cells in the periphery and spleen. It also increases the numbers of C-Kit⁺, Sca-1⁺, and lineage^-/low (KSL) cells and colony-forming units-granulocyte- macrophage (CFU-GM) in the spleen, indicating the expansion of hematopoietic progenitor cells. We found that even in RAG2^-/- mice, which lack mature T-cells and B-cells, IL-21 induced an increase in KSL cells and CFU-GM in the spleen. These results demonstrate that IL-21 can induce the expansion of hematopoietic progenitor cells in vivo, even in the absence of mature T-cells and B-cells. © 2006 The Japanese Society of Hematology.

PMID: 17050196    

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