Key result
Increased intracellular phosphatase activity (PP1 and PP2A) stimulates RyR-mediated sarcoplasmic reticulum Ca2+ release, leading to depleted Ca2+ stores in cardiac myocytes.
Population
Cardiac myocytes permeabilized with saponin and RyRs incorporated into lipid bilayers
Comparison
Exposure to protein phosphatases PP1 or PP2A vs Inhibitors of PP1 and PP2A
Design
Preclinical
Authors
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Hypothesis-generating for Ca²⁺ dysregulation therapies; does not alter clinical management.
Increased intracellular phosphatase activity stimulates RyR-mediated SR Ca2+ release leading to depleted SR Ca2+ stores in cardiac myocytes, providing mechanistic insight into abnormal calcium handling.
Terentyev et al. (2003) studied Heart failure (context). Protein phosphatases PP1 and PP2A vs. Inhibitors (okadaic acid and calyculin A) was evaluated on Spontaneous Ca2+ sparks and SR Ca2+ load. Increased intracellular phosphatase activity (PP1 and PP2A) stimulates RyR-mediated sarcoplasmic reticulum Ca2+ release, leading to depleted Ca2+ stores in cardiac myocytes.
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