Cited by 73Spaceflight effects on biologyBone and Dental Protein StudiesImmunotoxicology and immune responses

Osteopontin regulates hindlimb-unloading-induced lymphoid organ atrophy and weight loss by modulating corticosteroid production

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Wang, Kathryn X., Shi, Yufang, Denhardt, David T.·2007·Proceedings of the National Academy of Sciences

Abstract

Osteopontin (OPN), a multifunctional secreted phosphoglycoprotein, plays diverse roles in bone biology, immune regulation, cell survival, inflammation, and cancer metastasis. Here we show its role in determining lymphocyte homeostasis and body mass in response to hindlimb unloading (HU), a model for evaluating effects of weightlessness on the musculoskeletal and other physiological systems. Using this stress model, we compared OPN(-/-) mice with OPN(+/+) mice subjected to HU for 3 days. Whereas OPN(+/+) mice suffered a marked reduction of body weight and significant spleen and thymus atrophy, OPN(-/-) mice exhibited minor weight loss and much less spleen and thymus atrophy. The HU-induced lymphoid organ atrophy was the result of dramatically diminished numbers, respectively, of T and B cells in the spleen and CD4(+)CD8(+) double-positive cells in the thymus of OPN(+/+) mice. Increased levels of corticosterone, which modulates lymphocyte activation responses and apoptosis during stress, were found only in OPN(+/+) mice. Apoptotic cell death was evident in the spleen and thymus of OPN(+/+) mice subjected to HU but not in OPN(-/-)mice. Importantly, lymphocytes from both OPN(+/+) and OPN(-/-) mice were equally sensitive to corticosteroid-induced apoptosis. These results reveal that OPN is required for enhanced corticosterone production, immune organ atrophy, and weight loss in mice subjected to HU.

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Crossref · 10.1073/pnas.0703236104

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Authors
Wang, K. X., Shi, Y., & Denhardt, D. T.
Affiliations
  • Rutgers, The State University of New Jersey (US)
  • University of Medicine and Dentistry of New Jersey (US)
Corresponding author
Denhardt, David T.
Venue
Proceedings of the National Academy of Sciences
Published
2007-09-11
Volume
104
Issue
37
Pages
14777-14782
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2089332722
Cited by
73
References
40
Citations by year
2025: 3 · 2024: 2 · 2023: 1 · 2022: 5 · 2021: 6 · 2020: 5 · 2019: 7 · 2018: 3 · 2017: 4 · 2016: 5 · 2015: 1 · 2014: 9 · 2013: 5 · 2012: 1
FWCI
2.89
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Spaceflight effects on biology
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotoxicology and immune responses
Keywords
osteopontin, hindlimb unloading, microgravity, lymphoid organ atrophy, splenic atrophy, thymic atrophy, corticosterone, T cells, B cells, double-positive thymocytes, weight loss, lymphocyte homeostasis
MeSH terms
Adrenal Cortex Hormones, Animals, Anti-Inflammatory Agents, Atrophy, Cell Count, Corticosterone, Dexamethasone, Lymphatic System, Spleen, Thymus Gland, Weight Loss, T-Lymphocyte Subsets, Cytokines, Apoptosis, Mice, Knockout, Fluorescent Antibody Technique, Direct, Hindlimb Suspension, Mice, Osteopontin

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