Cited by 145T-cell and B-cell ImmunologyHematopoietic Stem Cell TransplantationDNA Repair Mechanisms

Bone Marrow Microenvironmental Changes Underlie Reduced RAG-mediated Recombination and B Cell Generation in Aged Mice

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Labrie, Joseph E., Sah, Alex P., Allman, David M., Cancro, Michael P., Gerstein, Rachel M.·2004·The Journal of Experimental Medicine

Abstract

During aging, adaptive immunity is severely compromised, due in part to decreased production of B lymphocytes and loss of immunoglobulin (Ig) diversity. However, the molecular mechanisms that underlie age-associated diminished B cell production remain unclear. Using in vivo labeling, we find that this reduction in marrow pre–B cells reflects increased attrition during passage from the pro–B to pre–B cell pool. Analyses of reciprocal bone marrow chimeras reveal that the magnitude and production rates of pre–B cells are controlled primarily by microenvironmental factors, rather than intrinsic events. To understand changes in pro–B cells that could diminish production of pre–B cells, we evaluated rag2 expression and V(D)J recombinase activity in pro–B cells at the single cell level. The percentage of pro–B cells that express rag2 is reduced in aged mice and is correlated with both a loss of V(D)J recombinase activity in pro–B cells and reduced numbers of pre–B cells. Reciprocal bone marrow chimeras revealed that the aged microenvironment also determines rag2 expression and recombinase activity in pro–B cells. Together, these observations suggest that extrinsic factors in the bone marrow that decline with age are largely responsible for less efficient V(D)J recombination in pro–B cells and diminished progression to the pre–B cell stage.

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  • Declines in the bone marrow microenvironment, possibly from reduced IL-7 secretion by stromal cells, have been implicated in B cell lineage aging.

    “Declines in the bone marrow microenvironment, possibly as a result of decreased IL-7 secretion by stromal cells, have been implicated in B cell lineage aging (36,37).”

    From Causes, consequences, and reversal of immune system aging (2013) · cites this paper as [36]

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Authors
Labrie, J. E., Sah, A. P., Allman, D. M., Cancro, M. P., & Gerstein, R. M.
Affiliations
  • University of Massachusetts Chan Medical School (US)
  • University of Pennsylvania (US)
Venue
The Journal of Experimental Medicine
Published
2004-08-16
Volume
200
Issue
4
Pages
411-423
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2163109682
Cited by
145
References
51
Citations by year
2026: 4 · 2025: 6 · 2024: 6 · 2023: 4 · 2022: 4 · 2021: 6 · 2020: 2 · 2019: 10 · 2018: 4 · 2017: 7 · 2016: 6 · 2015: 8 · 2014: 3 · 2013: 11 · 2012: 9
FWCI
3.12
Type
journal article
Language
en
Open access
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • eScholarship@UMassChan (submittedVersion)
Funders
  • National Institutes of Health (1r03ag019042-01, 1r03ag015623-01)
  • National Institute on Aging (AG19042, AG15623)
  • National Institute of Allergy and Infectious Diseases (R01AI043534, AI043534, R56AI043534)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 32520, 5 P30 DK 32520, P30DK032520)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
bone marrow microenvironment, aging, B cell development, V(D)J recombination, RAG2, pro-B cells, pre-B cells, immunosenescence, immunoglobulin diversity, bone marrow chimeras
MeSH terms
Aging, Animals, B-Lymphocytes, Bone Marrow, Bromodeoxyuridine, DNA-Binding Proteins, Flow Cytometry, Gene Expression Regulation, Immunity, Cellular, Mice, Inbred Strains, Time Factors, VDJ Recombinases, Mice

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