High-resolution tracking of cell division suggests similar cell cycle kinetics of hematopoietic stem cells stimulated in vitro and in vivo

被引:87
作者
Oostendorp, RAJ
Audet, J
Eaves, CJ
机构
[1] British Columbia Canc Agcy, Terry Fox Lab, Vancouver, BC V5Z 1L3, Canada
[2] Univ British Columbia, Dept Med Genet, Vancouver, BC, Canada
[3] Univ British Columbia, Biotechnol Lab, Vancouver, BC, Canada
[4] Erasmus Univ, Dept Cell Biol & Genet, Rotterdam, Netherlands
关键词
D O I
10.1182/blood.V95.3.855.003k41_855_862
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
The kinetics of proliferation of primitive murine bone marrow (BM) cells stimulated either in vitro with growth factors (fetal liver tyrosine kinase ligand 3 [FL], Steel factor [SF], and interleukin-11 [IL-11], or hyper-IL-6) or in vivo by factors active in myeloablated recipients were examined. Cells were first labeled with 5- and B-carboxyfluorescein diacetate succinimidyl ester (CFSE) and then incubated overnight prior to isolating CFSE+ cells, After 2 more days in culture, more than 90% of the in vivo lymphomyeloid repopulating activity was associated with the most fluorescent CFSE+ cells (ie, cells that had not yet divided), although this accounted for only 25% of the repopulating stem cells measured in the CFSE+ "start" population. After a total of 4 days in culture (1 day rater), 15-fold more stem cells were detected (ie, 4-fold more than the day 1 input number), and these had become (and thereafter remained) exclusively associated with cells that had divided at least once in vitro. Flow cytometric analysis of CFSE+ cells recovered from the BM of transplanted mice indicated that these cells proliferated slightly faster (up to 5 divisions completed within 2 days and up to 8 divisions completed within 3 days in vivo versus 5 and 7 divisions, respectively, in vitro). FL, SF, and ligands which activate gp130 are thus efficient stimulators of transplantable stem cell self-renewal divisions in vitro. The accompanying failure of these cells to accumulate rapidly indicates important changes in their engraftment potential independent of accompanying changes in their differentiation status. (C) 2000 by The American Society of Hematology.
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页码:855 / 862
页数:8
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