Unknown

Dataset Information

0

Hematopoietic stem cells lacking Ott1 display aspects associated with aging and are unable to maintain quiescence during proliferative stress.


ABSTRACT: Aging degrades hematopoietic stem cell (HSC) functions, including stress response; however, the involved molecular pathways are incompletely defined. Murine BM conditionally deleted for One-Twenty-Two-1 (Ott1), is able to maintain lifelong hematopoiesis and has preserved numbers of long-term HSCs, yet cannot repopulate nor sustain itself after transplantation against a competitor even when Ott1 is excised after engraftment. We show, specifically under replicative stress, that Ott1-deleted HSCs have a significant reduction of the G(0) cell-cycle fraction associated with self-renewal and undergo early failure. Therefore, Ott1 is required to preserve HSC quiescence during stress but not steady-state hematopoiesis. Reduced tolerance of replicative stress, increased myeloid potential, and greater absolute numbers are mutual characteristics of both Ott1-deleted and aged HSCs, and comparison of their gene expression profiles reveals a shared signature. Ott1-deleted HSCs share multiple aging-associated physiologic changes, including increases in NF-?B activation and DNA damage. Loss of Ott1 causes increased reactive oxygen species; however, antioxidant treatment does not rescue the competitive defect, indicating the existence of additional essential Ott1-dependent HSC pathways. In conclusion, our data establish a requirement for Ott1 in stress hematopoiesis and suggest that Ott1-dependent processes may converge with those affected by aging.

SUBMITTER: Xiao N 

PROVIDER: S-EPMC3367894 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature

altmetric image

Publications

Hematopoietic stem cells lacking Ott1 display aspects associated with aging and are unable to maintain quiescence during proliferative stress.

Xiao Nan N   Jani Kaushal K   Morgan Kelly K   Okabe Rachel R   Cullen Dana E DE   Jesneck Jonathan L JL   Raffel Glen D GD  

Blood 20120406 21


Aging degrades hematopoietic stem cell (HSC) functions, including stress response; however, the involved molecular pathways are incompletely defined. Murine BM conditionally deleted for One-Twenty-Two-1 (Ott1), is able to maintain lifelong hematopoiesis and has preserved numbers of long-term HSCs, yet cannot repopulate nor sustain itself after transplantation against a competitor even when Ott1 is excised after engraftment. We show, specifically under replicative stress, that Ott1-deleted HSCs h  ...[more]

Similar Datasets

2012-04-23 | E-GEOD-37047 | biostudies-arrayexpress
2012-04-24 | GSE37047 | GEO
| S-EPMC8387025 | biostudies-literature
| S-EPMC3821873 | biostudies-literature
| S-EPMC6534147 | biostudies-literature
| S-EPMC2839936 | biostudies-literature
| S-EPMC3230534 | biostudies-literature
| S-EPMC5664522 | biostudies-literature
| S-EPMC3144254 | biostudies-literature
| S-EPMC4258871 | biostudies-literature