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Expression of PDGF-β receptor, EGF receptor, and receptor adaptor protein Shc in rat osteoblasts during spaceflight

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Abstract

A number of studies have indicated that microgravity induces osteopenia and modulates functions of mammalian cells. However, the molecular mechanisms underlying these effects of microgravity are still unknown. Rat osteoblasts were cultured for 4 and 5 days during Shuttle-Spacelab flight, and fixed by guanidine isothiocyanate solution on board after treatment with 1α, 25 (OH)2 vitamin D3. The mRNA levels for platelet-derived growth factor (PDGF)-β receptor, epidermal growth factor (EGF) receptor, the growth factor receptor adaptor protein Shc, and c-fos were determined using the method of quantitative reverse transcription-polymerase chain reaction. The mRNA levels for EGF receptor were not altered by microgravity. However, the mRNA levels for PDGF-β receptor, Shc, and c-fos were decreased to 62, 55 and 25% on the 4th day of flight, and 47, 40, and 43% on the 5th day, respectively, as compared to the corresponding ground controls. Expression of the growth factor receptor and the receptor adaptor protein was modulated in rat osteoblasts during spaceflight. Data suggest that signal transduction via growth factor receptors in rat osteoblasts is impaired by microgravity. Dysfunction of osteoblasts might be involved in spaceflight-induced osteopenia.

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Authors and Affiliations

  1. Biological Sciences Department, Toray Research Center Inc., Japan

    Hideo Akiyama, Shozo Kanai & Masahiko Hirano

  2. Faculty of Dentristry, Tokyo Medical and Dental University, Japan

    Hitoyata Shimokawa, Hisako Katano & Yasuhiro Kumei

  3. National Space Development Agency of Japan/Tsukuba Space Center, Japan

    Chiaki Mukai & Shunji Nagaoka

  4. Division of Rehabilitation Medicine, Tokyo Medical and Dental University, Japan

    Sadao Morita

Authors
  1. Hideo Akiyama
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  2. Shozo Kanai
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  3. Masahiko Hirano
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  4. Hitoyata Shimokawa
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  5. Hisako Katano
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  6. Chiaki Mukai
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  7. Shunji Nagaoka
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  8. Sadao Morita
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  9. Yasuhiro Kumei
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Akiyama, H., Kanai, S., Hirano, M. et al. Expression of PDGF-β receptor, EGF receptor, and receptor adaptor protein Shc in rat osteoblasts during spaceflight. Mol Cell Biochem 202, 63–71 (1999). https://doi.org/10.1023/A:1007097511914

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  • DOI: https://doi.org/10.1023/A:1007097511914

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