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- Title
Myosin filament assembly onto myofibrils in live neonatal cardiomyocytes observed by TPEF-SHG microscopy.
- Authors
Liu, Honghai; Shao, Yonghong; Qin, Wan; Runyan, Raymond B.; Xu, Meifeng; Ma, Zhen; Borg, Thomas K.; Markwald, Roger; Gao, Bruce Z.
- Abstract
Aims Understanding myofibrillogenesis is essential for elucidating heart muscle formation, development, and remodelling in response to physiological stimulation. Here, we report the dynamic assembly process of contractile myosin filaments onto myofibrils in a live cardiomyocyte culture during myofibrillogenesis. Methods and results Utilizing a custom-built, two-photon excitation fluorescence and second harmonic generation imaging system equipped with an on-stage incubator, we observed new sarcomere additions in rat neonatal cardiomyocytes during 10 h of on-stage incubation. The new sarcomere additions occurred at the side of existing myofibrils, where we observed mature myofibrils acting as templates, or at the interstice of several separated myofibrils. Conclusions During sarcomeric addition, myosin filaments are assembled onto the premyofibril laterally. This lateral addition, which proceeds stepwise along the axial direction, plays an important role in the accumulation of Z-bodies to form mature Z-disks and in the regulation of sarcomeric alignment during maturation.
- Subjects
MYOSIN; HEART cells; FLUORESCENCE; MYOCARDIUM; CELL culture; MYOFIBRILS; CELL physiology
- Publication
Cardiovascular Research, 2013, Vol 97, Issue 2, p262
- ISSN
0008-6363
- Publication type
Article
- DOI
10.1093/cvr/cvs328