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J Exp Med. 2016 Oct 17;213(11):2259-2267. Epub 2016 Oct 10.

Progressive alterations in multipotent hematopoietic progenitors underlie lymphoid cell loss in aging.

Author information

1
The Jackson Laboratory for Mammalian Genetics, Bar Harbor, ME 04609.
2
The Jackson Laboratory for Mammalian Genetics, Bar Harbor, ME 04609 jennifer.trowbridge@jax.org.

Abstract

Declining immune function with age is associated with reduced lymphoid output of hematopoietic stem cells (HSCs). Currently, there is poor understanding of changes with age in the heterogeneous multipotent progenitor (MPP) cell compartment, which is long lived and responsible for dynamically regulating output of mature hematopoietic cells. In this study, we observe an early and progressive loss of lymphoid-primed MPP cells (LMPP/MPP4) with aging, concomitant with expansion of HSCs. Transcriptome and in vitro functional analyses at the single-cell level reveal a concurrent increase in cycling of aging LMPP/MPP4 with loss of lymphoid priming and differentiation potential. Impaired lymphoid differentiation potential of aged LMPP/MPP4 is not rescued by transplantation into a young bone marrow microenvironment, demonstrating cell-autonomous changes in the MPP compartment with aging. These results pinpoint an age and cellular compartment to focus further interrogation of the drivers of lymphoid cell loss with aging.

PMID:
27811054
PMCID:
PMC5068232
DOI:
10.1084/jem.20160168
[Indexed for MEDLINE]
Free PMC Article

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