Calcified Tissue International

, Volume 94, Issue 6, pp 569–579 | Cite as

Physiological Effects of Microgravity on Bone Cells

  • Yasir Arfat
  • Wei-Zhong Xiao
  • Salman Iftikhar
  • Fan Zhao
  • Di-Jie Li
  • Yu-Long Sun
  • Ge Zhang
  • Peng Shang
  • Ai-Rong Qian
Original Research

Abstract

Life on Earth developed under the influence of normal gravity (1g). With evidence from previous studies, scientists have suggested that normal physiological processes, such as the functional integrity of muscles and bone mass, can be affected by microgravity during spaceflight. During the life span, bone not only develops as a structure designed specifically for mechanical tasks but also adapts for efficiency. The lack of weight-bearing forces makes microgravity an ideal physical stimulus to evaluate bone cell responses. One of the most serious problems induced by long-term weightlessness is bone mineral loss. Results from in vitro studies that entailed the use of bone cells in spaceflights showed modification in cell attachment structures and cytoskeletal reorganization, which may be involved in bone loss. Humans exposed to microgravity conditions experience various physiological changes, including loss of bone mass, muscle deterioration, and immunodeficiency. In vitro models can be used to extract valuable information about changes in mechanical stress to ultimately identify the different pathways of mechanotransduction in bone cells. Despite many in vivo and in vitro studies under both real microgravity and simulated conditions, the mechanism of bone loss is still not well defined. The objective of this review is to summarize the recent research on bone cells under microgravity conditions based on advances in the field.

Keywords

Bone cell Microgravity Simulated microgravity Physiological effect Bone loss Mechanotransduction 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yasir Arfat
    • 1
  • Wei-Zhong Xiao
    • 2
  • Salman Iftikhar
    • 3
  • Fan Zhao
    • 1
  • Di-Jie Li
    • 1
  • Yu-Long Sun
    • 1
  • Ge Zhang
    • 4
  • Peng Shang
    • 1
  • Ai-Rong Qian
    • 1
  1. 1.Key Laboratory for Space Biosciences & Biotechnology, Institute of Special Environmental Biophysics, Faculty of Life SciencesNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China
  2. 2.Department of NeurologyNanhui Branch of Huashan Hospital Affiliated to Fudan UniversityShanghaiChina
  3. 3.Department of PharmacologyFMH College of Medicine and DentistryLahorePakistan
  4. 4.Institute for Advancing Translational Medicine in Bone and Joint Diseases, School of Chinese MedicineHong Kong Baptist UniversityHong KongChina

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