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Original Article |
Correspondence to: Hiromitsu Nakauchi, Dept. of Immunology, Institute of Basic Medical Sciences, University of Tsukuba and CREST (JST), 1-1-1 Tennodai, Tsukuba 305-8575, Japan. Tel:81-298-53-6964 Fax:81-298-53-6966
Little is known about how hematopoietic stem cells (HSCs) self-renew. We studied the regeneration of HSCs in culture. Effects of various cytokines on cell division of CD34-/low c-Kit+Sca-1+ lineage markernegative (CD34-KSL) bone marrow cells of the mouse were first evaluated in serum-free single cell culture. We then performed a competitive repopulation assay on divided cells to ask if such cell division involved self-renewal of HSCs.
In the presence of stem cell factor (SCF), thrombopoietin (TPO) induced a first cell division of CD34-KSL cells more efficiently than did interleukin (IL)-3 or IL-6. Multilineage repopulating cells were detected in a significant proportion of cells derived from single cells in culture with TPO and SCF, although this culture condition led to a substantial decrease in HSC number. These regenerated repopulating cells could be further transplanted into secondary recipients. When paired daughter cells were separately studied, one of a pair gave rise to repopulating cells with self-renewal potential, suggesting asymmetric self-renewal division. This study provides evidence that one HSC regenerates at least one HSC in culture.
Key Words: mouse, bone marrow transplantation, hematopoiesis, self-renewal, cell division
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