Volume 84, Issue 6 pp. 538-546

Effective ex vivo expansion of hematopoietic stem cells using osteoblast-differentiated mesenchymal stem cells is CXCL12 dependent

Seiji Mishima

Seiji Mishima

Central of Clinical Laboratory, Shimane University Hospital

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Atsushi Nagai

Atsushi Nagai

Department of Laboratory Medicine, Shimane University Faculty of Medicine, Izumo, Japan

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Sk Abdullah

Sk Abdullah

Department of Laboratory Medicine, Shimane University Faculty of Medicine, Izumo, Japan

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Chikashi Matsuda

Chikashi Matsuda

Central of Clinical Laboratory, Shimane University Hospital

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Takeshi Taketani

Takeshi Taketani

Division of Blood Transfusion, Shimane University Hospital

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Shunichi Kumakura

Shunichi Kumakura

Department of Education for Rural Medicine, Shimane University Faculty of Medicine

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Hiroshi Shibata

Hiroshi Shibata

Central of Clinical Laboratory, Shimane University Hospital

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Hiroto Ishikura

Hiroto Ishikura

Cancer Center, Shimane University Hospital

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Seung U. Kim

Seung U. Kim

Division of Neurology, UBC Hospital, University of British Columbia, Vancouver, Canada

Medical Research Institute, Chung-Ang University College of Medicine, Seoul, Korea

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Junichi Masuda

Junichi Masuda

Department of Laboratory Medicine, Shimane University Faculty of Medicine, Izumo, Japan

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First published: 17 May 2010
Citations: 46
Atsushi Nagai, MD, PhD, Department of Laboratory Medicine, Shimane University Faculty of Medicine, Izumo, 693-8501 Japan. Tel & Fax: +81 853 20 2312; e-mail: [email protected]

Abstract

Effective ex vivo expansion of hematopoietic stem cells (HSCs) is a prerequisite for HSC transplantation. Growth and maintenance of HSC is dependent on cytokine and niche factors. We investigated whether mesenchymal stem cells (MSCs) or osteogenic cytokine-differentiated MSCs play a role in HSC expansion. We used the human HM3.B10 (B10) MSC cell line and the osteoblast-differentiated B10 (Ost-B10) as a feeder layer and examined ex vivo expansion of CD34+CD38 HSCs obtained from peripheral blood (PB) and cord blood (CB) with or without several growth cytokines. Both undifferentiated B10 and Ost-B10 cells exhibited similar effects on total HSC expansion; however, Ost-B10 demonstrated a higher potency in CD34+CD38 cell-specific proliferation in the presence of cytokines compared to undifferentiated B10 HSCs. Colony-forming cell assay and long-term culture initiating cell assay revealed that Ost-B10 displayed multipotent differentiation and enabled long-term ex vivo culture of HSCs. We next examined the relationship between HSC expansion and the presence of various chemokines. CXCL4 and CXCL12 expression were increased in Ost-B10 cells compared with the B10 cells. CD34+CD38 cells were significantly increased with CXCL12, but not CXCL4 treatment. siRNA inhibition of CXCL12 decreased CXCL12 secretion in both B10 and Ost-B10, whereas expansion of CD34+CD38 cells was decreased in Ost-B10 alone. These results demonstrated that ex vivo expansion of HSCs may be highly effective through osteoblast-differentiated MSCs acting as a feeder layer, and likely operates through the CXCL12 chemokines signaling pathway.

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