Tuberculosis and Respiratory Diseases

  • 제73권6호
  • /
  • Pages.312-319
  • /
  • 2012
  • /
  • 1738-3536(pISSN)
  • /
  • 2005-6184(eISSN)
대한결핵및호흡기학회 (The Korean Academy of Tuberculosis and Respiratory Diseases)
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Role of IL-15 in Sepsis-Induced Skeletal Muscle Atrophy and Proteolysis

  • Kim, Ho Cheol (Department of Internal Medicine, Institute of Health Science, Gyeongsang National University School of Medicine) ;
  • Cho, Hee-Young (Gyeongsang National University Hospital, Biomedical Research Institute) ;
  • Hah, Young-Sool (Gyeongsang National University Hospital, Biomedical Research Institute)
  • 투고 : 2012.09.07
  • 심사 : 2012.12.10
  • 발행 : 2012.12.30
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초록

Background: Muscle wasting in sepsis is associated with increased proteolysis. Interleukin-15 (IL-15) has been characterized as an anabolic factor for skeletal muscles. Our study aims to investigate the role of IL-15 in sepsis-induced muscle atrophy and proteolysis. Methods: Mice were rendered septic either by cecal ligation and puncture or by intraperitoneal injection of lipopolysaccharide (LPS, 10 mg/kg i.p.). Expression of IL-15 mRNA and protein was determined by reverse transcriptase polymerase chain reaction and Western blot analysis in the control and septic limb muscles. C2C12 skeletal muscle cells were stimulated in vitro with either LPS or dexamethasone in the presence and absence of IL-15 and sampled at different time intervals (24, 48, or 72 hours). IL-15 ($10{\mu}g/kg$) was intraperitoneally administered 6 hours before sepsis induction and limb muscles were sampled after 24 hours of sepsis. Cathepsin L activity was determined to measure muscle proteolysis. Atrogin-1 and muscle-specific ring finger protein 1 (MuRF1) expressions in limb muscle protein lysates was analyzed. Results: IL-15 mRNA expression was significantly lower in the limb muscles of septic mice compared to that of controls. Cathepsin L activity in C2C12 cells was significantly lower in presence of IL-15, when compared to that observed with individual treatments of LPS or dexamethasone or tumor necrosis factor ${\alpha}$. Further, the limb muscles of mice pre-treated with IL-15 prior to sepsis induction showed a lower expression of atrogin-1 and MuRF1 than those not pre-treated. Conclusion: IL-15 may play a role in protection against sepsis-induced muscle wasting; thereby, serving as a potential therapeutic target for sepsis-induced skeletal muscle wasting and proteolysis.

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참고문헌

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