Journal
AGING CELL
Volume 11, Issue 6, Pages 949-959Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1474-9726.2012.00862.x
Keywords
cell proliferation; cytokine; hematopoiesis cytokine; hematopoietic stem cells; self-renewal
Categories
Funding
- NIH [R01HL095675, R01HL110806, R21HL102688, T32HL007971]
- Myeloproliferative Neoplasm Research Foundation
- Gabrielle's Angel Foundation for Cancer Research
- American Heart Association (AHA)
Ask authors/readers for more resources
Upon aging, the number of hematopoietic stem cells (HSCs) in the bone marrow increases while their repopulation potential declines. Moreover, aged HSCs exhibit lineage bias in reconstitution experiments with an inclination toward myeloid at the expense of lymphoid potential. The adaptor protein Lnk is an important negative regulator of HSC homeostasis, as Lnk deficiency is associated with a 10-fold increase in HSC numbers in young mice. However, the age-related increase in functional HSC numbers found in wild-type HSCs was not observed in Lnk-deficient animals. Importantly, HSCs from aged Lnk null mice possess greatly enhanced self-renewal capacity and diminished exhaustion, as evidenced by serial transplant experiments. In addition, Lnk deficiency ameliorates the aging-associated lineage bias. Transcriptome analysis revealed that WT and Lnk-deficient HSCs share many aging-related changes in gene expression patterns. Nonetheless, Lnk null HSCs displayed altered expression of components in select signaling pathways with potential involvement in HSC self-renewal and aging. Taken together, these results suggest that loss of Lnk partially mitigates age-related HSC alterations.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available