Cited by 108Bone Metabolism and DiseasesBone health and osteoporosis researchEstrogen and related hormone effects

Ovariectomy Activates Chronic Low-Grade Inflammation Mediated by Memory T Cells, Which Promotes Osteoporosis in Mice

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Cline-Smith, Anna, Axelbaum, Ariel, Shashkova, Elena, Chakraborty, Mousumi, Sanford, Jessie, Panesar, Prabhjyot, Peterson, Macey, Cox, Linda +3 more·2020·Journal of Bone and Mineral Research

Abstract

The loss of estrogen (E2) initiates a rapid phase of bone loss leading to osteoporosis in one-half of postmenopausal women, but the mechanism is not fully understood. Here, we show for the first time how loss of E2 activates low-grade inflammation to promote the acute phase of bone catabolic activity in ovariectomized (OVX) mice. E2 regulates the abundance of dendritic cells (DCs) that express IL-7 and IL-15 by inducing the Fas ligand (FasL) and apoptosis of the DC. In the absence of E2, DCs become long-lived, leading to increased IL-7 and IL-15. We find that IL-7 and IL-15 together, but not alone, induced antigen-independent production of IL-17A and TNFα in a subset of memory T cells (TMEM). OVX of mice with T-cell–specific ablation of IL15RA showed no IL-17A and TNFα expression, and no increase in bone resorption or bone loss, confirming the role of IL-15 in activating the TMEM and the need for inflammation. Our results provide a new mechanism by which E2 regulates the immune system, and how menopause leads to osteoporosis. The low-grade inflammation is likely to cause or contribute to other comorbidities observed postmenopause. © 2020 American Society for Bone and Mineral Research.

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  • Loss of estrogen promotes low-grade T-cell-regulated inflammation.

    “Cline-Smith et al. (2020) further strengthened this model by demonstrating a relationship between the loss of estrogen and the promotion of low-grade T-cell-regulated inflammation [21].”

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Authors
Cline-Smith, A., Axelbaum, A., Shashkova, E., Chakraborty, M., Sanford, J., Panesar, P., Peterson, M., Cox, L., Baldan, A., Veis, D., & Aurora, R.
Affiliations
  • Saint Louis University (US)
  • Washington University in St. Louis (US)
  • Department of Biochemistry and Molecular Biology Saint Louis University School of Medicine St. Louis MO USA
  • Division of Bone and Mineral Diseases Washington University School of Medicine in St. Louis St. Louis MO USA
Corresponding author
Aurora, Rajeev
Venue
Journal of Bone and Mineral Research
Published
2020-01-29
Volume
35
Issue
6
Pages
1174-1187
ISSN
  • 0884-0431 (ISSN-L)
  • 1523-4681
OpenAlex
W3003921069
Cited by
108
References
131
Citations by year
2026: 23 · 2025: 20 · 2024: 20 · 2023: 17 · 2022: 15 · 2021: 9 · 2020: 4
FWCI
3.65
Type
journal article
Language
en
Open access
Locations
  • Journal of Bone and Mineral Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Washington University in St. Louis
  • Saint Louis University School of Medicine
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
Keywords
ovariectomy, estrogen deficiency, postmenopausal osteoporosis, low-grade inflammation, memory T cells, dendritic cells, IL-15, IL-7, IL-17A, TNF-α, Fas ligand, dendritic cell apoptosis, bone resorption, bone loss, menopause
MeSH terms
Animals, Female, Humans, Immunologic Memory, Inflammation, Osteoporosis, Ovariectomy, T-Lymphocytes, Mice

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