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Kit regulates maintenance of quiescent hematopoietic stem cells.

Thorén, Lina LU ; Liuba, Karina LU ; Bryder, David LU ; Nygren, Jens LU ; Jensen, Christina LU ; Qian, Hong LU ; Antonchuk, Jennifer LU and Jacobsen, Sten Eirik W LU (2008) In Journal of Immunology 180(4). p.2045-2053
Abstract
Hematopoietic stem cell (HSC) numbers are tightly regulated and maintained in postnatal hematopoiesis. Extensive studies have supported a role of the cytokine tyrosine kinase receptor Kit in sustaining cycling HSCs when competing with wild-type HSCs posttransplantation, but not in maintenance of quiescent HSCs in steady state adult bone marrow. In this study, we investigated HSC regulation in White Spotting 41 (Kit(W41/W41)) mice, with a partial loss of function of Kit. Although the extensive fetal HSC expansion was Kit-independent, adult Kit(W41/W41) mice had an almost 2-fold reduction in long-term HSCs, reflecting a loss of roughly 10,000 Lin(-)Sca-1(+)Kit(high) (LSK)CD34(-)Flt3(-) long-term HSCs by 12 wk of age, whereas... (More)
Hematopoietic stem cell (HSC) numbers are tightly regulated and maintained in postnatal hematopoiesis. Extensive studies have supported a role of the cytokine tyrosine kinase receptor Kit in sustaining cycling HSCs when competing with wild-type HSCs posttransplantation, but not in maintenance of quiescent HSCs in steady state adult bone marrow. In this study, we investigated HSC regulation in White Spotting 41 (Kit(W41/W41)) mice, with a partial loss of function of Kit. Although the extensive fetal HSC expansion was Kit-independent, adult Kit(W41/W41) mice had an almost 2-fold reduction in long-term HSCs, reflecting a loss of roughly 10,000 Lin(-)Sca-1(+)Kit(high) (LSK)CD34(-)Flt3(-) long-term HSCs by 12 wk of age, whereas LSKCD34(+)Flt3(-) short-term HSCs and LSKCD34(+)Flt3(+) multipotent progenitors were less affected. Whereas homing and initial reconstitution of Kit(W41/W41) bone marrow cells in myeloablated recipients were close to normal, self-renewing Kit(W41/W41) HSCs were progressively depleted in not only competitive but also noncompetitive transplantation assays. Overexpression of the anti-apoptotic regulator BCL-2 partially rescued the posttransplantation Kit(W41/W41) HSC deficiency, suggesting that Kit might at least in the posttransplantation setting in part sustain HSC numbers by promoting HSC survival. Most notably, accelerated in vivo BrdU incorporation and cell cycle kinetics implicated a previously unrecognized role of Kit in maintaining quiescent HSCs in steady state adult hematopoiesis. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Immunology
volume
180
issue
4
pages
2045 - 2053
publisher
American Association of Immunologists
external identifiers
  • PMID:18250409
  • WOS:000253005600013
  • Scopus:42149157791
ISSN
1550-6606
language
English
LU publication?
yes
id
4b7d9226-195d-439e-8b7e-4c56c0a24ea8 (old id 1042212)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/18250409?dopt=Abstract
date added to LUP
2008-03-06 14:26:39
date last changed
2016-12-04 04:37:47
@misc{4b7d9226-195d-439e-8b7e-4c56c0a24ea8,
  abstract     = {Hematopoietic stem cell (HSC) numbers are tightly regulated and maintained in postnatal hematopoiesis. Extensive studies have supported a role of the cytokine tyrosine kinase receptor Kit in sustaining cycling HSCs when competing with wild-type HSCs posttransplantation, but not in maintenance of quiescent HSCs in steady state adult bone marrow. In this study, we investigated HSC regulation in White Spotting 41 (Kit(W41/W41)) mice, with a partial loss of function of Kit. Although the extensive fetal HSC expansion was Kit-independent, adult Kit(W41/W41) mice had an almost 2-fold reduction in long-term HSCs, reflecting a loss of roughly 10,000 Lin(-)Sca-1(+)Kit(high) (LSK)CD34(-)Flt3(-) long-term HSCs by 12 wk of age, whereas LSKCD34(+)Flt3(-) short-term HSCs and LSKCD34(+)Flt3(+) multipotent progenitors were less affected. Whereas homing and initial reconstitution of Kit(W41/W41) bone marrow cells in myeloablated recipients were close to normal, self-renewing Kit(W41/W41) HSCs were progressively depleted in not only competitive but also noncompetitive transplantation assays. Overexpression of the anti-apoptotic regulator BCL-2 partially rescued the posttransplantation Kit(W41/W41) HSC deficiency, suggesting that Kit might at least in the posttransplantation setting in part sustain HSC numbers by promoting HSC survival. Most notably, accelerated in vivo BrdU incorporation and cell cycle kinetics implicated a previously unrecognized role of Kit in maintaining quiescent HSCs in steady state adult hematopoiesis.},
  author       = {Thorén, Lina and Liuba, Karina and Bryder, David and Nygren, Jens and Jensen, Christina and Qian, Hong and Antonchuk, Jennifer and Jacobsen, Sten Eirik W},
  issn         = {1550-6606},
  language     = {eng},
  number       = {4},
  pages        = {2045--2053},
  publisher    = {ARRAY(0x881f6f0)},
  series       = {Journal of Immunology},
  title        = {Kit regulates maintenance of quiescent hematopoietic stem cells.},
  volume       = {180},
  year         = {2008},
}