Pflügers Archiv

, Volume 447, Issue 2, pp 247–253 | Cite as

Effects of heat stress and mechanical stretch on protein expression in cultured skeletal muscle cells

  • K. Goto
  • R. Okuyama
  • H. Sugiyama
  • M. Honda
  • T. Kobayashi
  • K. Uehara
  • T. Akema
  • T. Sugiura
  • S. Yamada
  • Y. Ohira
  • T. Yoshioka
Skeletal Muscle


Effects of heat stress, mechanical stretching or a combination of both on the expression of heat shock proteins (HSPs) and total protein level were studied in a culture system. Rat skeletal muscle cells (L6) were cultured on flexible-bottomed culture plates. They were subjected to one of the four following conditions: (1) 97 h incubation at 37 °C, (2) 1 h incubation at 41 °C followed by 96 h incubation at 37 °C, (3) 1 h incubation at 37 °C followed by 96 h cyclic stretching (18% of initial length, 2-s stretch and 4-s release) at 37 °C or (4) 1 h incubation at 41 °C followed by 96 h cyclic stretching at 37 °C. The expression of HSP72 and HSP90 and total protein was determined in the crude homogenates, supernatant and pellets. Cellular protein concentrations in the homogenates and pellets were increased by heat stress and/or mechanical stress (stretch). A cumulative effect of the combination of heating and stretch on the protein concentration in the homogenates and in the pellets was noted. The expressions of HSP72 and HSP90 in the pellets were also increased by heat stress and/or stretch. However, HSP90 in the supernatant did not change following heat stress and/or stretch. The regulation of HSP72 and HSP90 expression in skeletal muscle cells may be closely related to total protein, the abundance of which is also stimulated by mechanical and heat stresses. These observations suggest strongly that heating and passive stretch of muscle may be useful as a means of increasing muscle mass, not only in athletes but also in patients during rehabilitation.


Skeletal muscle cells Proteins Culture Heat Stretch 



This study was supported, in part, by a Grant-in-Aid for Encouragement of Young Scientists (B, 14780025) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) to KG, and the Grant-in-Aid for Scientific Research (A, 15200049) from Japan Society for the Promotion of Science to Y.O.


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Copyright information

© Springer-Verlag  2003

Authors and Affiliations

  • K. Goto
    • 2
  • R. Okuyama
    • 2
  • H. Sugiyama
    • 2
  • M. Honda
    • 2
  • T. Kobayashi
    • 2
  • K. Uehara
    • 2
  • T. Akema
    • 2
  • T. Sugiura
    • 3
  • S. Yamada
    • 4
  • Y. Ohira
    • 1
  • T. Yoshioka
    • 2
    • 5
  1. 1.School of Health and Sport SciencesOsaka UniversityToyonaka City, OsakaJapan
  2. 2.Department of PhysiologySt. Marianna University School of MedicineKawasakiJapan
  3. 3.Faculty of EducationYamaguchi UniversityYamaguchiJapan
  4. 4.Department of Life Science, Graduate School of Arts and ScienceUniversity of TokyoTokyoJapan
  5. 5.Aomori University of Health and WelfareAomoriJapan

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