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• W2061002956 abstract "Mouse (m) and human embryonic stem cell-derived cardiomyocytes (hESC-CMs) are known to exhibit immature Ca2+ dynamics such as small whole-cell peak amplitude and slower kinetics relative to those of adult. In this study, we examined the maturity and efficiency of Ca2+-induced Ca2+ release in m and hESC-CMs, the presence of transverse (t) tubules and its effects on the regional Ca2+ dynamics. In m and hESC-CMs, fluorescent staining and atomic force microscopy (AFM) were used to detect the presence of t-tubules, caveolin-3, amphiphysin-2 and colocalization of dihydropyridine receptors (DHPRs) and ryanodine receptors (RyRs). To avoid ambiguities, regional electrically-stimulated Ca2+ dynamics of single ESC-CMs, rather than spontaneously beating clusters, were measured using confocal microscopy. m and hESC-CMs showed absence of dyads, with neither t-tubules nor colocalization of DHPRs and RyRs. Caveolin-3 and amphiphysin-2, crucial for the biogenesis of t-tubules with robust expression in adult CMs, were also absent. Single m and hESC-CMs displayed non-uniform Ca2+ dynamics across the cell that is typical of CMs deficient of t-tubules. Local Ca2+ transients exhibited greater peak amplitude at the peripheral than at the central region for m (3.50 ± 0.42 vs. 3.05 ± 0.38) and hESC-CMs (2.96 ± 0.25 vs. 2.72 ± 0.25). Kinetically, both the rates of rise to peak amplitude and transient decay were faster for the peripheral relative to the central region. Immature m and hESC-CMs display unsynchronized Ca2+ transients due to the absence of t-tubules and gene products crucial for their biogenesis. Our results provide insights for driving the maturation of ESC-CMs." @default.
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• W2061002956 date "2009-12-01" @default.
• W2061002956 modified "2023-10-01" @default.
• W2061002956 title "Absence of Transverse Tubules Contributes to Non-Uniform Ca²⁺ Wavefronts in Mouse and Human Embryonic Stem Cell–Derived Cardiomyocytes" @default.
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• W2061002956 doi "https://doi.org/10.1089/scd.2009.0052" @default.
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