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Hematopoietic stem cell ageing is uncoupled from p16(INK4A)-mediated senescence.

Attema, Joanne LU ; Pronk, Kees-Jan LU ; Norddahl, Gudmundur LU ; Nygren, Jens LU and Bryder, David LU (2009) In Oncogene 28. p.2238-2243
Abstract
Somatic stem cells are ultimately responsible for mediating appropriate organ homeostasis and have therefore been proposed to represent a cellular origin of the ageing process-a state often characterized by inappropriate homeostasis. Specifically, it has been suggested that ageing stem cells might succumb to replicative senescence by a mechanism involving the cyclin-dependent kinase inhibitor p16(INK4A). Here, we tested multiple functional and molecular parameters indicative of p16(INK4A) activity in primary aged murine hematopoietic stem cells (HSCs). We found no evidence that replicative senescence accompanies stem cell ageing in vivo, and in line with p16(INK4A) being a critical determinant of such processes, most aged HSCs (>99%)... (More)
Somatic stem cells are ultimately responsible for mediating appropriate organ homeostasis and have therefore been proposed to represent a cellular origin of the ageing process-a state often characterized by inappropriate homeostasis. Specifically, it has been suggested that ageing stem cells might succumb to replicative senescence by a mechanism involving the cyclin-dependent kinase inhibitor p16(INK4A). Here, we tested multiple functional and molecular parameters indicative of p16(INK4A) activity in primary aged murine hematopoietic stem cells (HSCs). We found no evidence that replicative senescence accompanies stem cell ageing in vivo, and in line with p16(INK4A) being a critical determinant of such processes, most aged HSCs (>99%) failed to express p16(INK4A) at the mRNA level. Moreover, whereas loss of epigenetically guided repression of the INK4A/ARF locus accompanied replicative senescent murine embryonic fibroblasts, such repression was maintained in aged stem cells. Taken together, these studies indicate that increased senescence as mediated by the p16(INK4A) tumor suppressor has only a minor function as an intrinsic regulator of steady-state HSC ageing in vivo.Oncogene advance online publication, 27 April 2009; doi:10.1038/onc.2009.94. (Less)
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Contribution to journal
publication status
published
subject
in
Oncogene
volume
28
pages
2238 - 2243
publisher
Nature Publishing Group
external identifiers
  • wos:000266640300006
  • pmid:19398954
  • scopus:67349161638
ISSN
1476-5594
DOI
10.1038/onc.2009.94
language
English
LU publication?
yes
id
6f00c9bb-a3c6-46e5-97e0-0ba6c899a537 (old id 1391796)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/19398954?dopt=Abstract
date added to LUP
2009-05-05 15:22:41
date last changed
2017-08-06 04:46:48
@article{6f00c9bb-a3c6-46e5-97e0-0ba6c899a537,
  abstract     = {Somatic stem cells are ultimately responsible for mediating appropriate organ homeostasis and have therefore been proposed to represent a cellular origin of the ageing process-a state often characterized by inappropriate homeostasis. Specifically, it has been suggested that ageing stem cells might succumb to replicative senescence by a mechanism involving the cyclin-dependent kinase inhibitor p16(INK4A). Here, we tested multiple functional and molecular parameters indicative of p16(INK4A) activity in primary aged murine hematopoietic stem cells (HSCs). We found no evidence that replicative senescence accompanies stem cell ageing in vivo, and in line with p16(INK4A) being a critical determinant of such processes, most aged HSCs (>99%) failed to express p16(INK4A) at the mRNA level. Moreover, whereas loss of epigenetically guided repression of the INK4A/ARF locus accompanied replicative senescent murine embryonic fibroblasts, such repression was maintained in aged stem cells. Taken together, these studies indicate that increased senescence as mediated by the p16(INK4A) tumor suppressor has only a minor function as an intrinsic regulator of steady-state HSC ageing in vivo.Oncogene advance online publication, 27 April 2009; doi:10.1038/onc.2009.94.},
  author       = {Attema, Joanne and Pronk, Kees-Jan and Norddahl, Gudmundur and Nygren, Jens and Bryder, David},
  issn         = {1476-5594},
  language     = {eng},
  pages        = {2238--2243},
  publisher    = {Nature Publishing Group},
  series       = {Oncogene},
  title        = {Hematopoietic stem cell ageing is uncoupled from p16(INK4A)-mediated senescence.},
  url          = {http://dx.doi.org/10.1038/onc.2009.94},
  volume       = {28},
  year         = {2009},
}