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Chronic Exposure to a TLR Ligand Injures Hematopoietic Stem Cells

Esplin, Brandt L, Shimazu, Tomoyuki, Welner, Robert S, Garrett, Karla P, Nie, Lei, Zhang, Qingzhao, Humphrey, Mary Beth, Yang, Qi, Borghesi, Lisa A, Kincade, Paul W·2011·The Journal of Immunology
DOI 10.4049/jimmunol.1003438PMC PMC3086167
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Abstract

Hematopoietic stem cells (HSC) can be harmed by disease, chemotherapy, radiation, and normal aging. We show in this study that damage also occurs in mice repeatedly treated with very low doses of LPS. Overall health of the animals was good, and there were relatively minor changes in marrow hematopoietic progenitors. However, HSC were unable to maintain quiescence, and transplantation revealed them to be myeloid skewed. Moreover, HSC from treated mice were not sustained in serial transplants and produced lymphoid progenitors with low levels of the E47 transcription factor. This phenomenon was previously seen in normal aging. Screening identified mAbs that resolve HSC subsets, and relative proportions of these HSC changed with age and/or chronic LPS treatment. For example, minor CD150HiCD48− populations lacking CD86 or CD18 expanded. Simultaneous loss of CD150Lo/−CD48− HSC and gain of the normally rare subsets, in parallel with diminished transplantation potential, would be consistent with age- or TLR-related injury. In contrast, HSC in old mice differed from those in LPS-treated animals with respect to VCAM-1 or CD41 expression and lacked proliferation abnormalities. HSC can be exposed to endogenous and pathogen-derived TLR ligands during persistent low-grade infections. This stimulation might contribute in part to HSC senescence and ultimately compromise immunity.

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Metadata

Authors
Esplin, B. L., Shimazu, T., Welner, R. S., Garrett, K. P., Nie, L., Zhang, Q., Humphrey, M. B., Yang, Q., Borghesi, L. A., & Kincade, P. W.
Affiliations
  • Immunobiology and Cancer Program, Oklahoma Medical Research Foundation , Oklahoma City, OK 73104
  • Veterans Affairs, University of Oklahoma Health Sciences Center , Oklahoma City, OK 73104
  • Department of Immunology, University of Pittsburgh , Pittsburgh, PA 15261
Venue
The Journal of Immunology
Publisher
Oxford University Press (OUP)
Published
2011-05-01
Volume
186
Issue
9
Pages
5367-5375
ISSN
  • 0022-1767
  • 1550-6606
DOI
10.4049/jimmunol.1003438
PMC
PMC3086167
Cited by
319
References
13
Language
en
Licence
academic.oup.com/pages/standard-publication-reuse-rights (vor)

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