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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한약리학회 The Korean Journal of Physiology & Pharmacology The Korean Journal of Physiology & Pharmacology 제22권 제6호
- 발행연도
- 2018.11
- 수록면
- 697 - 703 (7page)
- DOI
- https://doi.org/10.4196/kjpp.2018.22.6.697
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초록· 키워드
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Myoblast fusion depends on mitochondrial integrity and intracellular Ca2+ signaling regulated by various ion channels. In this study, we investigated the ionic currents associated with [Ca2+]i regulation in normal and mitochondrial DNAdepleted (ρ0) L6 myoblasts. The 0 myoblasts showed impaired myotube formation.
The inwardly rectifying K+ current (IKir) was largely decreased with reduced expression of KIR2.1, whereas the voltage-operated Ca2+ channel and Ca2+-activated K+ channel currents were intact. Sustained inhibition of mitochondrial electron transport by antimycin A treatment (24 h) also decreased the IKir. The ρ0 myoblasts showed depolarized resting membrane potential and higher basal [Ca2+]i. Our results demonstrated the specific downregulation of IKir by dysfunctional mitochondria. The resultant depolarization and altered Ca2+ signaling might be associated with impaired myoblast fusion in ρ0 myoblasts
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