생명과학회지 (Journal of Life Science)

  • 제27권8호
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  • Pages.879-887
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  • 2017
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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DOI QR코드

DOI QR Code

C2C12 골격근 세포에서 히스톤 탈 아세틸 효소의 억제가 인슐린 유사성장인자(IGF-I)에 의한 BDNF 발현 조절에 미치는 영향

Insulin-like Growth Factor-I Modulates BDNF Expression by Inhibition of Histone Deacetylase in C2C12 Skeletal Muscle Cells

  • 김혜진 (이화여자대학교 신산업융합대학 체육과학과) ;
  • 이원준 (이화여자대학교 신산업융합대학 체육과학과)
  • Kim, Hye Jin (Department of Kinesiology and Sports Studies, College of Science and Industry Convergence, Ewha Womans University) ;
  • Lee, Won Jun (Department of Kinesiology and Sports Studies, College of Science and Industry Convergence, Ewha Womans University)
  • 투고 : 2017.07.24
  • 심사 : 2017.08.09
  • 발행 : 2017.08.30
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초록

히스톤 탈 아세틸 효소(HDAC)와 인슐린유사성장인자(IGF-I)는 근육 관련 유전자들의 활성 및 발현을 조절하여 골격근의 성장 및 발달을 조절하지만 이들이 근신경계 발달 및 대사 기능에 중요한 역할을 담당하는 뇌신경성장인자(BDNF)의 발현에 미치는 영향에 관한 연구는 거의 이루어지지 않았다. 따라서 본 연구에서는 IGF-I과 HDAC의 억제제인 SAHA가 C2C12 골격근 세포에서 BDNF 발현에 미치는 영향을 알아보고자 하였다. 그 결과 IGF-I은 농도와 시간 의존적으로 BDNF의 mRNA 및 단백질 발현을 감소시켰지만 HDAC을 억제하자 IGF-I에 의해 감소되었던 BDNF의 발현이 증가하는 경향을 관찰할 수 있었다. 따라서 IGF-I은 BDNF의 발현을 억제하며, HDAC의 억제는 IGF-I에 의한 BDNF의 발현 억제를 감소시킬 수 있다는 사실을 확인할 수 있었다.

It is well established that brain-derived neurotrophic factor (BDNF) is expressed not only in the brain but also in skeletal muscle, and is required for normal neuromuscular system function. Histone deacetylases (HDACs) and insulin-like growth factor-I (IGF-I) are potent regulators of skeletal muscle myogenesis and muscle gene expression, but the mechanisms of HDAC and IGF-I in skeletal muscle-derived BDNF expression have not been examined. In this study, we examined the effect of IGF-I and suberoylanilide hydroxamic acid (SAHA), a pan-HDAC inhibitor, on BDNF induction. Proliferating or differentiating C2C12 skeletal muscle cells were treated with increasing concentrations (0-50 ng/ml) of IGF-I in the absence or presence of $5{\mu}M$ SAHA for various time periods (3-24 hr). Treatment of C2C12 cells with IGF-I resulted in a dose- and time-dependent decrease in BDNF mRNA expression. However, inhibition of HDAC led to a significant increase in the expression of BDNF mRNA levels. In addition, immunocytochemistry revealed high BDNF protein levels in undifferentiated C2C12 skeletal muscle cells, whether untreated, IGF-I-treated, or exposed to SAHA. These results represent the first evidence that IGF-I can suppress the mRNA and protein expression of BDNF; conversely, SAHA attenuates the effects of IGF-I. Consequently, SAHA upregulates BDNF expression in C2C12 skeletal muscle cells.

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