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Bone marrow adiposity modulation after long duration spaceflight in astronauts

Author

Listed:
  • Tammy Liu

    (Ottawa Hospital Research Institute)

  • Gerd Melkus

    (University of Ottawa)

  • Tim Ramsay

    (University of Ottawa)

  • Adnan Sheikh

    (University of Ottawa)

  • Odette Laneuville

    (University of Ottawa)

  • Guy Trudel

    (Ottawa Hospital Research Institute
    Division of Physical Medicine and Rehabilitation, The Ottawa Hospital
    University of Ottawa)

Abstract

Space travel requires metabolic adaptations from multiple systems. While vital to bone and blood production, human bone marrow adipose (BMA) tissue modulation in space is unknown. Here we show significant downregulation of the lumbar vertebrae BMA in 14 astronauts, 41 days after landing from six months’ missions on the International Space Station. Spectral analyses indicated depletion of marrow adipose reserves. We then demonstrate enhanced erythropoiesis temporally related to low BMA. Next, we demonstrated systemic and then, local lumbar vertebrae bone anabolism temporally related to low BMA. These support the hypothesis that BMA is a preferential local energy source supplying the hypermetabolic bone marrow postflight, leading to its downregulation. A late postflight upregulation abolished the lower BMA of female astronauts and BMA modulation amplitude was higher in younger astronauts. The study design in the extreme environment of space can limit these conclusions. BMA modulation in astronauts can help explain observations on Earth.

Suggested Citation

  • Tammy Liu & Gerd Melkus & Tim Ramsay & Adnan Sheikh & Odette Laneuville & Guy Trudel, 2023. "Bone marrow adiposity modulation after long duration spaceflight in astronauts," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40572-8
    DOI: 10.1038/s41467-023-40572-8
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