Abstract:
:Since detergent-resistant lipid rafts play important roles in the signal transduction for myogenesis, their comprehensive proteomic analysis could provide new insights to understand their function in myotubes. Here, the detergent-resistant lipid rafts were isolated from C2C12 myotubes and analyzed by capillary RPLC/MS/MS. Among the 327 proteins (or protein groups) identified, 28% were categorized to the plasma membrane or raft proteins, 29% to mitochondria, 20% to microsomal proteins, 10% to other proteins, and 13% to unknown proteins. The localization of oxidative phosphorylation (OXPHOS) complexes in the sarcolemma lipid rafts was further confirmed from C2C12 myotubes by cellular fractionation, surface-biotin labeling, immunofluorescence, and lipid raft fractionation. After adding exogenous cytochrome c, the sarcolemma isolated from myotubes had an ability to consume oxygen in the presence of NADH or succinate. The generation of NADH-dependent extracellular superoxide was increased by inhibiting or downregulating OXPHOS I, III, and IV in myotubes, indicating that OXPHOS proteins are major sources for extracellular ROS in skeletal muscle. With all these data, we can conclude that OXPHOS proteins are associated with the sarcolemma lipid rafts during C2C12 myogenesis to generate extracellular ROS.
journal_name
Proteomicsjournal_title
Proteomicsauthors
Kim BW,Lee JW,Choo HJ,Lee CS,Jung SY,Yi JS,Ham YM,Lee JH,Hong J,Kang MJ,Chi SG,Hyung SW,Lee SW,Kim HM,Cho BR,Min DS,Yoon G,Ko YGdoi
10.1002/pmic.200900826subject
Has Abstractpub_date
2010-07-01 00:00:00pages
2498-515issue
13eissn
1615-9853issn
1615-9861journal_volume
10pub_type
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