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Ca 2+ sparks are the fundamental units that comprise Ca 2+ -induced Ca 2+ release (CICR) in striated muscle cells. In cardiac muscle, spontaneous Ca 2+ sparks underlie the rhythmic CICR activity during heart contraction. In skeletal muscle, Ca 2+ sparks remain quiescent during the resting state and are activated in a plastic fashion to accommodate various levels...
A population of fast muscle fibers from aging mice is dependent on external Ca 2+ to maintain tetanic force during repeated contractions. We hypothesized that age-related denervation in muscle fibers plays a role in initiating this contractile deficit, and that prevention of denervation by IGF-1 overexpression would prevent external Ca 2+ -dependent contraction in aging mice. IGF-1...
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