Cited by 330Immune Response and InflammationCholesterol and Lipid MetabolismT-cell and B-cell Immunology

25-Hydroxycholesterol secreted by macrophages in response to Toll-like receptor activation suppresses immunoglobulin A production

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Bauman, David R., Bitmansour, Andrew D., McDonald, Jeffrey G., Thompson, Bonne M., Liang, Guosheng, Russell, David W.·2009·Proceedings of the National Academy of Sciences

Abstract

25-Hydroxycholesterol is produced in mammalian tissues. The function of this oxysterol is unknown. Here we describe a central role for 25-hydroxycholesterol in regulating the immune system. In initial experiments, we found that stimulation of macrophage Toll-like receptors (TLR) induced expression of cholesterol 25-hydroxylase and the synthesis of 25-hydroxycholesterol. Treatment of naïve B cells with nanomolar concentrations of 25-hydroxycholesterol suppressed IL-2-mediated stimulation of B cell proliferation, repressed activation-induced cytidine deaminase (AID) expression, and blocked class switch recombination, leading to markedly decreased IgA production. Consistent with these findings, deletion of the mouse cholesterol 25-hydroxylase gene caused an increase in serum IgA. Conversely, inactivation of the CYP7B1 oxysterol 7α-hydroxylase, which degrades 25-hydroxycholesterol, decreased serum IgA. The suppression of IgA class switching in B cells by a macrophage-derived sterol in response to TLR activation provides a mechanism for local and systemic negative regulation of the adaptive immune response by the innate immune system.

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Authors
Bauman, D. R., Bitmansour, A. D., McDonald, J. G., Thompson, B. M., Liang, G., & Russell, D. W.
Affiliations
  • The University of Texas Southwestern Medical Center (US)
  • Department of Molecular Genetics and
Venue
Proceedings of the National Academy of Sciences
Published
2009-09-29
Volume
106
Issue
39
Pages
16764-16769
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2038363528
Cited by
329
References
34
Citations by year
2026: 15 · 2025: 10 · 2024: 19 · 2023: 26 · 2022: 16 · 2021: 21 · 2020: 30 · 2019: 28 · 2018: 27 · 2017: 19 · 2016: 21 · 2015: 13 · 2014: 19 · 2013: 18 · 2012: 21
FWCI
6.76
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Welch Foundation (I-0971)
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (HL 20848)
  • National Institute of General Medical Sciences (U54GM069338, GM 069338)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 07745, T32DK007745)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
Keywords
25-hydroxycholesterol, oxysterols, macrophages, Toll-like receptor activation, immunoglobulin A, class switch recombination, activation-induced cytidine deaminase, B cell proliferation, cholesterol 25-hydroxylase, CYP7B1, negative regulation of immune response
MeSH terms
Animals, B-Lymphocytes, Hydroxycholesterols, Immunoglobulin A, Macrophages, Mice, Transgenic, Steroid Hydroxylases, Cytokines, Toll-Like Receptors, Mice

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